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Tiêu đề Dictionary of Occupational and Environmental Safety and Health - Part 4 (end) pot
Tác giả Vincoli, Jeffrey W.
Trường học CRC Press LLC
Thể loại Sách tham khảo
Năm xuất bản 2000
Thành phố Boca Raton
Định dạng
Số trang 280
Dung lượng 4,25 MB

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Nội dung

radiation dosimetry A measurement of the amount of ionizing radiation exposure by individuals, materials, or equipment at a specific location.. radiation survey An evaluation of the radi

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Vincoli, Jeffrey W "Q-Z"

Lewis' Dictionary of Occupational and Environmental Safety and Health

Edited by Jeffrey W Vincoli

Boca Raton: CRC Press LLC, 2000

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An rickettsial infection often seen among

meat and livestock handlers Can be

con-tracted by inhalation of dust particles that are

infected with the infectious organism The

organisms are found in the hides of sheep and

cattle It is contagious between humans and

its symptoms include sudden hay fever, chills,

headache, muscle pain, and coughing

A pretender to medical skill which he/she

does not possess One who practices as a

physician or surgeon without adequate

experi-ence or due qualification

quad map

A topographic map with an approximate scale

of one inch to 2,000 feet; shows physical

features such as wetlands, water bodies,

roadways, mines, and buildings

quadrant

(1) One-fourth of the circumference of a

cir-cle (2) An angular dissection of ninety

de-grees (3) One of the quarters created by two

intersecting lines, roads, streets, vectors, etc

(4) One of four corresponding parts, or

quar-ters, as of the surface of the abdomen or of the

field of vision

quadrantanopia

Loss of vision in one fourth of the visual field

quadriceps

Having four heads

quadriceps femoris muscle

A muscle group on the anterior thigh ing of four muscles which flex the hip andextend the knee: rectus femoris, vastus later-alis, vastus medialis, and vastus intermedius

consist-Well-defined quadriceps femoris muscles of the anterior thigh

quali-qualification tests

The required tests used to demonstrate that thedesign, manufacture, and assembly have re-sulted in hardware conforming to specifica-tion requirements

qualified

Adapted; fitted; entitled; susceptible; tent; fitting; possessing legal power or capac-ity; eligible Applied to one who has takenthe steps to prepare himself/herself for an ap-pointment of office One who is adequatelyand satisfactorily trained and/or experienced

compe-to perform a function or task

qualified handicapped individual

Under the Americans with Disabilities Act(ADA): A handicapped individual who is ca-pable of performing a specific job with rea-sonable accommodation

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qualified operator

A worker having the adequate physical/mental

attributes, training, education, and experience

who has demonstrated that he/she is capable

of safely performing a given task involving

the operation of machinery or equipment with

acceptable quality and quantity

qualified person

One familiar with the construction and

opera-tion of the equipment and the hazards

in-volved Note 1: Whether an employee is

con-sidered to be a "qualified person" will depend

upon various circumstances in the workplace

It is possible and, in fact, likely for an

indi-vidual to be considered "qualified" with

re-gard to certain equipment in the workplace,

but "unqualified" as to other equipment Note

2: An employee who is undergoing

on-the-job training and who, in the course of such

training, has demonstrated an ability to

per-form duties safely at his/her level of training

and who is under the direct supervision of a

qualified person is considered to be a

quali-fied person for the performance of those

du-ties

qualified worker

A worker having the adequate physical/mental

attributes, training, education, and experience

who has demonstrated that he/she is capable

of performing a given task using basic tools

with acceptable quality and quantity

qualifying phase I technology

Under the Clean Air Act (CAA): A

techno-logical system of continuous emission

reduc-tion which achieves a 90 percent reducreduc-tion in

emissions of sulfur dioxide from the

emis-sions that would have resulted from the use of

fuels which were not subject to treatment

prior to combustion

qualimeter

An instrument for measuring the quantity of

roentgen rays generated by a Coolidge tube

qualitative

The characteristic attributes or qualities

per-taining to an exposure based on subjective

in-formation, nonrigorous quantitative data, and

judgment

qualitative exposure assessment

The identification of contaminants and

physi-cal agents an individual may be exposed to,

and a judgment of the associated hazard based

on the frequency and duration of exposure,the control measures in effect (engineering,administrative, and personal protection), theproperties of the stressor, and the manner inwhich it is being used/handled

qualitative risk assessment

An examination of system risk based uponestablished criteria that allows the analyst toevaluate risk levels in relation to other risks ortotal system risk

quality

A condition in which a product satisfies a set

of requirements involving such aspects asstrength, durability, function, appearance, anduser-satisfaction

quality analysis

An examination or study of product qualitygoals

quality assurance (QA)

(1) A company-wide program that establishesproject policies, procedures, standards, andguidelines designed to produce an acceptablelevel of professional quality (2) A system ofpractices, procedures, and activities that aretaken to provide assurance that the work be-ing carried out will meet defined standards ofquality The assessment of the potential for aprocedure to produce sampling results of ade-quate quality to satisfy the defined objectives.The primary purpose of a quality assuranceprogram is to provide the necessary safe-guards to minimize erroneous sample analy-ses and to provide a means of detecting errorswhen they occur

quality assurance project plan

As per the Environmental Protection Agency(EPA): A plan that describes the policy, or-ganization, functional activities, and qualityassurance and quality control protocols neces-sary to achieve DQOs dictated by the in-tended use of the data (RI/FS Guidance)

quality assurance/quality control

According to the U.S Environmental tion Agency (EPA): A system of procedures,checks, audits, and corrective actions to en-sure that all EPA research design and per-formance, environmental monitoring andsampling, and other technical and reportingactivities are of the highest achievable quality

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Protec-quality circle (QC)

A small group of people involved in a similar

type of work who voluntarily meet on a

pre-determined schedule (e.g., weekly) on paid

time in an attempt to identify, analyze, and

solve some of the problems in their work

en-vironment Also referred to as quality

con-trol circles and employee participation team.

quality control chart

A chart used for recording data regarding

product quality

quality control (QC) programs

Establish project activities that apply the

poli-cies, procedures, standards, training,

guide-lines, and systems developed in the QA

pro-gram QC programs aim to maintain an

ac-ceptable level of project quality through

ap-plication of sound project management

prin-ciples and practices

quality factor

(1) General A measure for expressing the

rate of attenuation (sharpness) of time-varying

energy as a function of frequency Also

re-ferred to as Q factor (2) Ionizing Radiation.

A modifying factor that is used to derive the

radiation dose equivalent from absorbed dose

It is a factor by which the absorbed radiation

dose in rad is multiplied to obtain a quantity

that expresses the biological effectiveness of

the absorbed dose in rem The factor for beta,

gamma, and X-radiation is 1 For alpha

parti-cles and fast neutrons it is 10 Other values

are used for neutrons of other energies and

heavy recoil nuclei (3) Ionizing Radiation.

The number intended to represent the

effec-tiveness of various types of ionizing radiation

based on relative biological effectiveness or

linear energy transfer, based on the following

The lowest level at which a chemical may be

accurately and reliably quantified Usually

equal to the detection limit multiplied by a

factor of 3 to 5, but varies between chemicals

and between samples

quantitative

The property of anything which can be mined by measurement and expressed as aquantity

deter-quantitative exposure assessment

The procedure of quantitatively determining

an individual's exposure to a health hazard,employing accepted sampling and analyticalprocedures, and assessing the likelihood that

an adverse health effect may occur based onthe sample results

quantitative risk assessment

An application of statistical techniques tomathematically identify the level of probablerisk associated with a given hazard, as it re-lates to total system operation

quantum

The smallest quantity of energy, responding

to the energy of electromagnetic radiation,that can be associated with a given phenome-non

quantum theory

A theory based on the concept that energy isradiated intermittently in units of definitemagnitude called quanta and absorbed in likemanner

quarantine

(1) A place or period of detention of shipscoming from infected or suspected ports (2)Restrictions placed on entering or leavingpremises where a case of communicable dis-ease exists (3) The application of measures

to prevent contact between persons who arenot infected and persons suspected of beinginfected

quarrel

An altercation, angry dispute, or an exchange

of recriminations, taunts, threats, or tions between two persons

See also malaria.

quarter

The fourth part of anything, especially a year

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quarter line

A line used to set a boat out where

maneuver-ability is limited

quarter section

The quarter of a section of land according to

the divisions of a government survey,

deter-mined by dividing the section into four equal

parts by north and south and east and west,

and containing 160 acres (a quarter of a

square mile of land)

quartile

The value of the boundary at the 25th, 50th,

or 75th percentile of a frequency distribution

divided into four parts, each containing a

quarter of the population

quartz

One of the forms of crystalline silicon

diox-ide Also referred to as one of the forms of

free silica

Quaternary

The period of geologic time starting 1.6

mil-lion years ago and continuing to the present

day It is divided into two epochs: the

Pleis-tocene and the Holocene, with the division

between these two falling approximately

10,000 years before the present Late

Qua-ternary refers to time between 700,000 years

ago and the present day PQuaternary

re-fers to any time before 1.6 million years ago

quaternary

(1) Fourth in a series (2) Made up of four

elements or radicals

Queckenstedt's test

When the veins in the neck are compressed on

one or both sides there is a rapid rise in the

pressure of the cerebrospinal fluid of healthy

persons, and this rise quickly disappears when

pressure is taken off the neck But when there

is a block in the spinal canal the pressure of

the cerebrospinal fluid is affected little or not

at all by the maneuver

quench tank

A water-filled tank used to cool incinerator

residues or hot materials during industrial

processes

Quervain's disease

Inflammation of the long abductor and short

extensor tendons of the thumb, with swelling

and tenderness

questioning technique

A method for analyzing and attempting toimprove work processes, generally by askingquestions such as: a) what is the purpose forsome activity, b) why is a particular sequencefollowed, c) why does a particular personperform that job, and d) is the method beingused to accomplish the task the best possible

questionnaire

A written set of questions intended to obtain

an individual's responses on his/her attitudes,issues, etc

queue

(1) Place a discrete unit in position for quential flow in a single processing channel.(2) A location from which units may be se-lected for processing when processing time orother requisite conditions permit

se-queuing theory

A quantitative rule describing the patternspertaining to arrivals, service times, and thesequence in which arrivals are handled

quick disconnect valve

(1) Breathing Apparatus A device which

starts the flow of air by inserting of the hose(which leads from the facepiece) into theregulator of self-contained breathing appara-tus, and stops the flow of air by disconnection

of the hose from the regulator (2) Servicing and Maintenance A mechanical device, usu-

ally spring-loaded or under some type of chanical tension, that allows for the quickconnection and/or disconnection of twostructures Common in many industries, such

me-as refining, aerospace, the military, etc

Quick disconnect valves used in the fueling of aircraft allow for quick and safe connection/disconnection of fuel hose lines

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(1) A display technique involving the use oftime derivatives for aiding an operator intracking or control operations involving mo-tion (2) The first perceptible movement ofthe fetus in the uterus, appearing usually inthe sixteenth to eighteenth week of pregnancy

quinine

A white, bitter alkaloid usually obtained fromcinchona An analgesic, antipyretic, bittertonic, and effective antimalarial

quotidian

(1) Recurring every day (2) A form of mittent malarial fever with daily recurrentparoxysms

QWERTY keyboard

A keyboard with a letter distribution pattern

of QWERTY on the left side of the top row

See also Dvorak keyboard.

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An instrument for measuring and displaying

the intensity of ionizing radiation in

An acute infectious viral disease

communi-cated to man by the bite of an infected animal

and affecting the brain and the nervous

sys-tem Rabies is transmitted by warm-blooded

animals, especially dogs and foxes The viru s

i s often pres en t in th e sal iv a of affected ani mal s

and is trans mit ted chi efl y th ro u gh bi te wou n ds

and occasi on all y th rou gh op en wo un ds or

s ores After the vi ru s ent ers the bo dy it travel s

alo ng th e nerve tru n k to th e brain The farther

the bite is from the head, the longer it takes to

reach the brain The incubation period varies

from 2 weeks to as long as 6 months The

bitten person must start treatment with

antira-bies vaccine and serum before the virus

reaches the brain The disease must be

pre-vented because it is always fatal in man Also

called hydrophobia.

RAC

See risk assessment code.

race

(1) A breakdown of the human species by

certain genetically determined characteristics

such as skin color, bodily proportions, hair

type, and stature (2) A form of competition

where the purpose is to complete a prescribed

path or function with a minimal time or ahead

of others in the competition

raceway

A channel designed expressly for holdingwires, cables, or bus bars, with additionalfunctions (as permitted in applicable codesand standards) Raceways may be of metal orinsulating material, and the term includesrigid metal conduit, rigid nonmetallic conduit,intermediate metal conduit, liquid-tight flexi-ble metal conduit, flexible metal conduit,electrical metallic tubing, under floor race-ways, cellular concrete floor raceways, cellu-lar metal floor raceways, surface raceways,wire ways, and bus ways

radar air traffic control facility (RATCF)

An air traffic control facility, located at a U.S.Naval or Marine Corps Air Station, utilizingsurveillance, and normally, precision ap-proach radar and air/ground communicationequipment to provide approach control serv-ices to aircraft arriving, departing, or transit-ing the airspace controlled by the facility.The facility may be operated by the FederalAviation Administration (FAA), the UnitedSates Navy (USN), the United States MarineCorp (USMC), or the FAA & USN and serv-ice may be provided for both civil and mili-tary airports

radar air traffic control tower

An airport traffic control tower that uses radarand nonradar capabilities to provide approachcontrol services to aircraft arriving, departing,

or transiting airspace controlled by the ity It provides radar air traffic control serv-ices to aircraft operating in the vicinity of one

facil-or mfacil-ore civil and/facil-or military airpfacil-orts in theterminal area

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Radar air traffic control operations

radar altimeter

Aircraft instrument that makes use of the

re-flection of radio waves from the ground to

determine the height of the aircraft above the

surface

radar approach control (RAPCON)

An air traffic control facility, located at a U.S

Air Force (USAF) base, utilizing surveillance

and, normally, precision approach radar and

air/ground communication equipment to

pro-vide approach control services to aircraft

ar-riving, departing, and transiting the airspace

controlled by the facility The facility may be

operated by the Federal Aviation

Administra-tion (FAA), or the United States Air Force

(USAF) Service may be provided to both

civil and military airports

radar approach control tower

An airport traffic control tower (ATCT) that

uses radar and nonradar capabilities to

pro-vide approach control services to aircraft

ar-riving, departing, or transiting airspace

con-trolled by the facility It provides radar Air

Traffic Control (ATC) services to aircraft

op-erating in the vicinity of one or more civil

and/or military airports in the terminal area In

other words, a radar approach control tower is

an ATCT at which airport traffic control

spe-cialists are permitted to provide radar

ap-proach control service, including extensive

vectoring, as well as to handle takeoffs and

landings Radar acts can be separated into a

control tower and a radar room

radial deviation

A movement of the wrist such that the tudinal axis of the hand is directed toward thelateral/radial/thumb side of the forearm

longi-radial keratotomy

A surgical procedure in which radial incisionsare made in the cornea to improve myopic vi-sion

See elbow height.

radiale – stylion length

The linear distance from radiale to stylionparallel to the long axis of the freely hanginglower arm Measured with the individualstanding, the arm hanging naturally at theside, and the palm facing the thigh Also re-

ferred to as forearm length and lower arm length.

radian

A planar angular measure in which the arclength of the subtended angle at the center of

a circle equals the radius (approximately 57.3

degrees) See also plane angle.

radiance (L)

The value of the ratio of the radian flux to thesolid angle and the perpendicular surfaceprojection

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radiant energy

The energy of electromagnetic waves from

sources such as radiowaves, visible light,

in-frared, x-rays, and gamma rays These waves

do not need molecules to propagate them, and

in a vacuum they travel at nearly 300,000

kilometers per second

radiant exitance (M)

The radiant flux density leaving a specified

surface

radiant flux

The rate of flow of radiant power which flows

onto or through a unit area

radiant flux density

That amount of radiant power which flows

onto or through a unit area

radiant heat

A form of electromagnetic energy

radiant heat load

Energy that is transformed into heat when it

strikes an object The human body can both

emit and receive radiant energy

radiant heat temperature

The temperature of an object as a result of it

having absorbed radiant energy

radiant heat transfer

Radiant heat transfer occurs when there is a

large difference between the temperatures of

two surfaces that are exposed to each other

but are not touching

radiant heating

That heating which occurs solely by radiation

radiation

(1) Divergence from a common center (2) A

structure made up of diverging elements,

es-pecially a tract of the central nervous system

made up of diverging fibers (3)

Electromag-netic waves The emission and propagation of

energy in the form of waves or corpuscular

emissions of particles through space or

through a material medium; for instance, the

emission and propagation of electromagnetic

waves, electric waves, or other forms of

elec-tromagnetic radiation, as well as ionizing

ra-diation Sources of radiation include natural

or "background" radiation, such as cosmic

rays from outer space, and the naturally

oc-curring radioactive substances found in the

earth Manmade radiations result from

artifi-cially produced nuclear reactions in stableelements which are then changed to radioac-tive substances Radiations are particulateand nonparticulate; that is, that may be made

up of particles such as neutrons and protonswhich are fragments of the nuclei of disinte-grating atoms, or they may consist of electro-magnetic waves, which have no mass Par-ticulate radiations may consist of alpha parti-cles or beta particles Most radioactive iso-topes (radioisotopes) emit particulate radia-tions and at the same time also release elec-tromagnetic rays (gamma rays) Both par-ticulate and nonparticulate radiations are ca-pable of penetrating and being absorbed intomatter Alpha particles are the least pene-trating; beta particles slightly more penetrat-ing; and the gamma rays, like x-rays, are ca-pable of completely penetrating the body.Harmful effects of uncontrolled radiation ex-posure include serious disturbances of bonemarrow and other blood-forming organs,burns, and sterility There may be permanentdamage to the germ plasm or genes, which re-sults in genetic mutations The mutations can

be transmitted to future generations tion also may produce harmful effects on theembryo or fetus, bringing about fetal death ormalformations Radiation also apparentlyshortens the life span of those exposed to itover a period of time, and predisposes persons

Radia-to the development of cataracts Exposure Radia-tolarge doses of radiation over a short period oftime produces a group of symptoms known asthe acute radiation syndrome These symp-toms include general malaise, nausea, andvomiting, followed by a period of remission

of symptoms Later, the patient developsmore severe symptoms such as fever, hemor-rhage, fluid loss, anemia, and central nervoussystem involvement The symptoms thengradually subside or become more severe, andmay lead to death

radiation absorbed dose (rad)

The unit of absorbed dose which is equal to

100 ergs/g It is a measure of the energy parted to matter by ionizing particles per unitmass of irradiated material at the point of ex-posure

im-radiation accident

Any accident exposing humans to excessiveradiation or involving the spread of radioac-

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tive materials beyond their intended

contain-ment

radiation area

An area accessible to individuals, in which

ionizing radiation levels could result in a

per-son receiving a dose equivalent in excess of 5

millirem (equivalent to 0.05 mSv) in 1 hour at

12 inches (30 centimeters) from the source or

from any surface that the radiation penetrates

radiation dosimetry

A measurement of the amount of ionizing

radiation exposure by individuals, materials,

or equipment at a specific location

radiation effect

Any of the documented effects from high

lev-els of ionizing radiation exposure, such as hair

loss, cancer, nausea, cataracts, or death See

also radiation sickness.

radiation fluence

See fluence.

radiation fog

Fog produced over land when radiation

cool-ing reduces the air temperature to or below its

dew point It is also referred to as ground fog

and valley fog.

radiation hazard

A situation in which persons might receive

ionizing radiation in excess of the applicable

maximum permissible dose or in which

radia-tion damage might be done to materials

radiation inversion

An increase in temperature with height due to

radiation cooling of the earth's surface Also

called nocturnal inversion.

radiation length

The mean distance required to reduce the

en-ergy of charged particles by 1/e in passing

through a material

radiation monitoring

A form of environmental monitoring in which

periodic or continuous measurements are

taken to determine the radiation levels present

in a specific environment

radiation protection

Any measure to reduce the exposure of

hu-mans and/or equipment to radiation, whether

through legislation, regulations, policies, or

physical measures

radiation protection guide (RPG)

The total amount of ionizing radiation doseover certain periods of time that may be per-mitted to persons whose occupation involvesexposure to such radiation It is equivalent to

what was formerly called the maximum missible exposure (MPE).

per-radiation protection officer (RPO)

The person who has been selected and trained

to be responsible for overseeing the ionizingradiation protection program in a facility

Also referred to as the radiation safety officer

or RSO.

radiation safety

The study and/or implementation of ment and procedures to prevent excessive ra-diation exposure to personnel or radiation re-lease to the environment

equip-radiation safety officer (RSO)

See radiation protection officer.

radiation sickness

A self-limiting syndrome characterized bynausea, vomiting, diarrhea, and psychic de-pression, following exposure to appreciabledoses of ionizing radiation, particularly to the

abdominal region Also called radiation drome.

syn-radiation source

Materials, equipment, or devices that generate

or are capable of generating ionizing radiationincluding naturally occurring radioactive ma-terials, byproduct materials, source materials,special nuclear materials, fission products,materials containing induced or deposited ra-dioactivity, nuclear reactors, radiographic andfluoroscopic equipment, particle generatorsand accelerators, radio frequency generatorssuch as certain klystrons and magnetrons thatproduce x-rays, and high voltage devices thatproduce x-rays

radiation standards

Regulations that set maximum exposure limitsfor protection of the public from radioactivematerials

radiation survey

An evaluation of the radiation hazard incident

to the production, use, release, disposal, orpresence of a radioactive material or othersources of ionizing radiation under a specificset of conditions Includes surveys necessary

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to evaluate external exposures to personnel,

surface contamination, and the concentration

of airborne radioactive materials in the facility

and in effluents from the facility, as

An ionic group having one or more charges,

either positive or negative A group of

at-oms which can enter into a chemical reaction

but which is incapable of existing separately

See also free radical.

R a d i o Au t o m o b i l e C o m m u n i c a t i o n S y s t e m

A Japanese government/private industry

pro-ject to develop future street/highway vehicle

systems

radio contact

Aviation The initial radio call-up to a flight

service station by en route aircraft, which

in-cludes a complete interchange of information

and a termination of the contact

radio frequency (Rf)

Electromagnetic energy from 30 kHz to 300

GHz

radioactive

A property of some materials or elements that

is characterized by their spontaneous emission

of radiation

radioactive contamination

Contamination with radioactive material(s)

radioactive decay

The disintegration of the nucleus of an

unsta-ble nuclide by the spontaneous emission of

charged particles and/or photons

radioactive decontamination

The removal of contaminating radioactive

materials from a given location

radioactive device

See radioactive equipment.

radioactive equipment

Equipment or devices that generate, or are

capable of generating, ionizing radiation

in-cluding radiographic and fluoroscopic

equip-ment, particle generators and accelerators, dio frequency generators such as certainklystrons and magnetrons that produce x-rays,and high voltage devices that produce x-rays

ra-radioactive half-life

That time required for one-half the originalamount of unstable nuclei in a radioactivesample to decay

radioactive material

Materials that generate, or are capable of erating, ionizing radiation including naturallyoccurring radioactive materials, byproductmaterials, source materials, special nuclearmaterials, fission products, materials con-taining induced or deposited radioactivity, andnuclear reactors

gen-radioactive series

A succession of nuclides, each of which forms by radioactive disintegration into thenext nuclide until a stable one results

unsta-by bombarding isotopes of the element withhigh-velocity particles When an element isunstable, whether naturally or artificially, theratio of protons to neutrons in its atoms is un-even Each atom attempts to achieve stability

by giving off particles from its nucleus andthus it begins to disintegrate, releasing bothnuclear particles and electromagnetic radia-tions Since these radiations interact withmatter, including the cells of the body, they

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can be extremely harmful or, under proper

control, extremely useful (in medical therapy,

for example)

radioactivity concentration guide (RCG)

The maximum permissible amount of any

specified radioisotope that may be allowed to

accumulate in the body

radiobiology

The study of radiation effects on living things

More specifically, the branch of science

con-cerned with effects of light and of ultraviolet

and ionizing radiations on living tissue or

or-ganisms

radiocarbon

A radioactive isotope of carbon The isotope

of mass 14 (14C) is used in many diagnostic

procedures and physiologic investigations

With a half-life of 5568 years, it has provided

a means of determining the age of many

an-cient substances and articles

radiograph

A picture of an object that is made by passing

ionizing radiation through the object and

photographic film positioned on the opposite

side of the object from the radiation source

radiographer

The individual who is in attendance at a site

where ionizing radiation sources are being

used and is the user or supervises their use in

industrial radiographic operations This

indi-vidual is responsible for complying with

regulations and adherence with good practice

during the procedure

radiography

The use of penetrating radiation such as

x-rays, gamma x-rays, or neutrons, to make visual

images of the insides of objects An

exami-nation of humans or animals, or of the

struc-ture of materials by non-destructive methods,

utilizing sealed sources of ionizing radiation

or ionizing radiation-producing machines

radioisotope

An unstable isotope of an element that

disin-tegrates spontaneously, emitting ionizing

ra-diation, and yielding a different isotope

radiological health

The art and science of protecting humans,

animals, and the environment from injury or

damage from sources of ionizing radiation

and promoting better health through beneficialapplications of sources of ionizing radiation

radiology

The branch of medicine that deals with thediagnostic and therapeutic applications of ra-diant energy

radioluminescence

The emission of visible light from ionizingradiation or the decay of radioactive isotopescausing the excitation of crystals or phos-phors

radiometer

An instrument used to demonstrate the formation of radiant energy into mechanicalenergy

trans-radiometric unit

A unit of measurement for radiant magnetic energy in terms of energy or power,without regard to biological effects

radiosensitive

Term used in describing tissues that are moreeasily damaged as the result of exposure toionizing radiation

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A chemical element, atomic number 88,

atomic weight, 226, symbol Ra Radium is

highly radioactive and is found in uranium

minerals Radium salts emit, in addition to

heat and light, three distinct kinds of radiation

(alpha, beta, and gamma rays) and also a

ra-dioactive gas called radon

radius

(1) The linear distance from the center of a

circle to its edge (2) The lateral forearm

bone

radius of curvature

The radius of a circle whose arc matches a

curve or surface at a given point

radius of vulnerable zone

The maximum distance from the point of

re-lease of a hazardous substance in which the

airborne concentration could reach the level

of concern under specified weather

condi-tions

radon

(1) A chemical element formed by the

disin-tegration of radium 226 or radium 224; a

heavy, colorless, odorless and radioactive gas

(2) An inert gaseous element formed by

ra-dioactive decay of radium atoms in soil or

rocks

radon daughters

See radon progeny.

radon decay products

A term used to refer collectively to the

imme-diate products of the radon decay chain These

include Po 218, Pb 214, Bi 214, and Po 214,

which have an average combined half-life of

about thirty minutes

radon progeny

A term referring collectively to the

intermedi-ate products produced in the radon decay

chain Also called radon daughters.

raffinate

In solvent extraction, it is that portion of the

mixture which remains undissolved and not

removed by the solvent

rafter sample

A sample of settled dust that is obtained from

a rafter or other undisturbed surface that will

contain representative particulates that have

settled out of the air The sample must be

representative of the airborne dust to whichpersonnel are exposed

A rolled steel shape laid in two parallel lines

to form a track for carrying vehicles with

flanged steel wheels See also locomotive, railway, railroad, and train.

rail car

A car designed to carry freight or passenger personnel by rail, and includes abox car, flat car, gondola car, hopper car, tank

non-car, and occupied caboose See also railway car.

Typical rail car used for hauling freight

rail-highway grade crossing

A location where one or more railroad trackscross a public highway, road, or street or aprivate roadway, and includes sidewalks and

pathways at or associated with the crossing See also grade crossings and highway-rail crossing.

rail joint bond

Railroad A metallic connection attached to

adjoining rails to insure electrical ity

conductiv-rail ladder

A fixed ladder consisting of side rails joined

at regular intervals by rungs or cleats andfastened in full length or in sections to abuilding, structure, or equipment

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rail mode

Consists of freight and passenger (including

commuter) railroads See also rapid rail,

rapid transit rail, transit mode, transit

rail-road, and transit railway.

railbus

A rel at i vely li gh t, di es el-po wered , two -axl e rai l

v eh icle wi th a bo dy resembl in g that of a bu s

railing

A vertical barrier erected along exposed sides

of stairways and platforms to prevent falls of

persons The top member of a railing usually

serves as a handrail

railroad

(1) A person engaged in transportation by rail

(2) All forms of non-highway ground

trans-portation that run on rails or electro-magnetic

guide ways, including a) commuter or other

short-haul rail passenger service in a

metro-politan or suburban area, and b) high speed

ground transportation systems that connect

metropolitan areas, without regard to whether

or not they use new technologies not

associ-ated with traditional railroads Such term

does not include rapid transit operations

within an urban area that are not connected to

the general railroad system of transportation

(3) Any surface transportation system that

carries passengers, goods, materials, or

prop-erty over rails See also locomotive, rail,

railway, and train.

railroad accident

An event arising from the operation of a

rail-road which, with minor exceptions results in

one or more of the following circumstances:

a) Any impact between railroad on-track

equipment and an automobile, bus, truck,

motorcycle, bicycle, farm vehicle, pedestrian,

or other highway user at a highway-rail

crossing b) Any collision, derailment, fire,

explosion, act of God, or other event

involv-ing the operation of railroad on-track

equip-ment, standing or moving, which results in

more than $6,300 in damages to railroad

on-track equipment, signals, on-track, on-track

struc-tures, and roadbeds c) Any event arising

from the operation of a railroad which results

in the death of one or more persons; an injury

to one or more persons (other than railroad

employees) requiring medical treatment d)

An injury to one or more employees which

requires medical treatment; or results in

re-striction of work or motion for one or moredays, or one or more lost work days, transfer

to another job, termination of employment,loss of consciousness or any occupational ill-ness of a railroad employee as diagnosed by aphysician

railroad and railway electric service

Electricity supplied to railroads and interurbanand street railways, for general railroad use,including the propulsion of cars or locomo-tives, where such electricity is supplied underseparate and distinct rate schedules

railroad car mile

A single railroad car moved a distance of onemile

railroad crossing collision

A collision between on-track railroad ment at a point where tracks intersect

equip-railroad switching and terminal

A company primarily performing switchingservice, furnishing terminal trackage, bridges,

or other facilities such as union freight tions, operating ferries, or performing any one

sta-or a combination of these functions It maycoincidentally conduct a regular freight orpassenger service

railroad switching and terminal ments

establish-Establishments primarily engaged in the nishing of terminal facilities for rail passenger

fur-or freight traffic ffur-or line-haul service, and inthe movement of railroad cars between termi-nal yards, industrial sidings, etc Terminalcompanies do not necessarily operate any ve-hicles themselves, but may operate the sta-tions and terminals

railway

A permanent way having one or more rails

which provides a track for trains See also comotive, rail, railroad, and train.

lo-railway car

A railway car designed to carry freight, road personnel, or passengers This includesboxcars, covered hopper cars, flatcars, refrig-erator cars, gondola cars, hopper cars, tankercars, cabooses, stock cars, ventilation cars,and special cars It also includes on-track

rail-maintenance equipment See also rail car.

railway gauge

Distance between the rails of a track

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railway yard

An area provided with a system of tracks and

associated structures, where railway trains are

assembled, and railway cars are switched,

stored, or serviced

rain

Precipitation in the form of liquid water drops

that have diameters greater than that of

driz-zle

rain cap

A sheet-metal fixture which is placed on the

outlet of a stack/vent for preventing rain from

entering Also called a weather cap.

rain shadow

The region on the leeside of a mountain where

the precipitation is noticeably less than on the

windward side

rainbow

An arc of concentric colored bands that spans

a section of the sky when rain, fog, or water

spray is present and the sun is positioned at

the observer's back The colors are those of

the spectrum and are visible due to sunlight

passing through and refracted by the airbornewater molecules

rainbow passage

A paragraph of text, which when read, results

in the reader making a wide range of facialmovements This reading can be used for thetalking phase of the respirator fit test protocol

raking collision

Rail Operations A collision between parts or

a consist on an adjacent track, or with astructure such as a bridge

rales

Abnormal sounds in the respiratory systemindicating some type of pathological condi-tion

ramp metering

(1) The process of facilitating traffic flow onfreeways by regulating the amount of trafficentering the freeway through the use of con-trol devices on entrance ramps (2) The pro-cedure of equipping a freeway approach rampwith a metering device and traffic signal thatallow the vehicles to enter the freeway at apredetermined rate

ramus

(1) The posterior, vertical portion of the dible (2) A branch, as of a nerve, vein, orartery

man-rancid

Refers to a musty, rank taste or smell that isusually associated with fats that have under-gone decomposition

Rand formula

An agreement under which employees paydues to a union without being required to jointhe union

random

Not deterministic A variable whose value at

a particular future instant cannot be predictedexactly

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random access memory (RAM)

Computing High-speed memory that holds a

copy of the operating system, any programs

that are currently running on a computer, and

any information that is being processed

RAM is temporary memory; all information

in RAM is lost when the user turns off the

computer RAM is resident memory,

meas-ured in bytes or megabytes, of a computer

system that enables and facilitates most of the

system's base functions as well as some

higher level operating functions It is memory

located in the semiconductor chips in the

computer, not on the hard disk The more

RAM, the more programs can be run at the

same time and the faster the programs will

run

random errors

Errors which are the result of uncontrollable

or unknown sources They are the result of

variation, due to chance, that occurs in

moni-toring despite the effort to control all

vari-ables They are characterized by the random

occurrence of both positive and negative

de-viations from the mean, and these tend to

can-cel out if the sample size is sufficient

random noise

An oscillation whose magnitude is not

speci-fied and cannot be predicted with certainty for

any given instance of time

random process

A collection of all possible sample functions

which might be produced by random

phe-nomena

random sample

A sample that has been collected in such a

manner that each individual in the population

represented by the sampled individual had an

equal probability of being sampled This

con-cept can be applied to personnel, work areas,

work shifts, dates, etc The objective in

col-lecting a random sample is to obtain a sample

which is free of bias

random signal

See random process.

random variable

A real function whose value is determined

randomly Also referred to as chance

vari-able and stochastic varivari-able.

range

(1) General The distance between two

ex-tremes (e.g., the high point and the low point)

(2) Instrumentation The upper and lower

limits between which an instrument respondsand over which the instrument is calibrated.The interval between the upper and lowermeasuring limits of an instrument

range-bearing display

See B display.

range of motion (ROM)

The spatial extent through which a combination

of joints, limbs, or links can be normallymoved

rank

(1) To place a set of scores or other numericvariables in rank order (2) The location of ascore in a set of rank-ordered scores (3) Themaximum number of linearly independentrows in a matrix

rank order

A sequence in which objects are organizedsequentially by their quantitative score onsome descriptor, variable, or parameter

rank order correlation

Any non-parametric correlation test for nificance between at least ordinal-level pairedobservations in a random sample

sig-Rankine (R)

A temperature scale with zero F at 460ºRankine The freezing point of water on thisscale is 491.6ºR and the boiling point is671.7ºR

ranking crew member

Rail Operations An individual in whom the

general charge of the train or yard crew isvested in accordance with the railroad's oper-ating rules Unless otherwise designated bythe railroad, the ranking crew member will bethe assigned locomotive engineer

RAPCON

See radar approach control.

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Recommended assigned protection factor

rapid eye movement (REM)

Any short, quick movement of the eyes,

espe-cially that occurring during the rapid eye

movement phase of sleep

rapid eye movement sleep

That phase of sleep during which the eyeballs

can be observed to move rapidly and the EEG

resembles an awake, alert state Typically

thought to be involved with dreaming

rapid rail

A subway-type transit vehicle railway

oper-ated on exclusive private rights-of-way with

high-level platform stations Rapid rail also

may operate on elevated or at grade-level

track separated from other traffic See also

rail mode, rapid transit rail, transit mode,

transit railroad, and transit railway.

rapid transit

Rail or motorbus transit service operating

completely separate from all modes of

trans-portation on an exclusive right-of-way

rapid transit rail

Transit service using rail cars driven by

elec-tricity usually drawn from a third rail,

config-ured for passenger traffic and usually operated

on exclusive rights-of-way It generally uses

longer trains and has longer station spacing

than light rail See also rail mode, rapid rail,

transit mode, transit railroad, and transit

railway.

rapids

An area of broken, fast flowing water in a

stream, where the slope of the bed increases

(but without a prominent break of slope which

might result in a waterfall), or where a gently

dipping bar of harder rock outcrops

rapture of the deep/depths

See nitrogen narcosis.

rarefaction

The momentary reduction in pressure during

the trough in a sound wave

rasp

A machine that grinds waste into a

manage-able material and helps prevent odor

raster display

A video- or CRT-type display in which the

screen is written in a standard,

prepro-grammed sequence

ratbite fever

Either of two distinct diseases (Haverhill ver and sodoku) that may be transmitted toman by the bite of an infected rat and, lesscommonly, by the bite of an infected squirrel,weasel, dog, cat, or pig

fe-RATCF

See radar air traffic control facility.

ratchet

Marine Operations A heavy turnbuckle with

cork-screw threads and midships handle,equipped with pelican hooks on both ends forthe purpose of rapidly tightening up wirelashings holding the barges of a tow together

It is widely used on the rivers

rate

(1) The frequency at which a certain event orcircumstance occurs within a specified orcommonly understood time period (2) Thequantity of output produced, expressed as ei-ther per unit time or percent of capac-ity/normal (3) See speed (4) See wage rate

and piece rate (5) To judge the relative orabsolute amount of some quality of an entity

or process, using some scale or other basis

rate change

(1) Any alteration in a production time or put standard (2) Any alteration in workercompensation, whether time based or outputbased

out-rate control

The ability to adjust a controlling device as afunction of changes in the velocity of a con-tinuously moving object or pattern Also re-

ferred to as first-order control and velocity control.

rate cutting

An arbitrary reduction in the incentive payrate or scale

rate of decay

Acoustics The time rate at which the sound

pressure level decreases at a given point and

at a given time after the source is turned off

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rate-regulated pipelines

The pipelines included in these segments are

all federally or state rate-regulated pipeline

operations, which are included in the

report-ing company's consolidated financial

state-ments However, at the reporting company's

option, intrastate pipeline operations may be

included in the U.S Refining/Marketing

Segment if a) they would comprise less than

5 percent of U.S Refining/Marketing

Seg-ment net property plant & equipSeg-ment (PP&E),

revenues, and earnings in the aggregate; and

b) if the inclusion of such pipelines in the

consolidated financial statements adds less

than $100 million to the net PP&E reported

for the U.S Refining/Marketing Segment

rate setting

The establishment of standard time values or

any monetary pay scale for a given operation,

based on a rate determination

rated activity sampling

A more detailed activity sampling in which a

rating is determined for each work element to

establish the work content in addition to that

time occupied by delays and other activities

rated average element time

See normal element time.

rated load

The maximum static load or force that can be

imposed on the part or structure at any time

during its intended operation and expected

environment

rated maximum continuous augmented thrust

With respect to turbojet engine type

certifica-tion, means the approved jet thrust that is

de-veloped statically or in flight, in standard

at-mosphere at a specified altitude, with fluid

injection or with the burning of fuel in a

sepa-rate combustion chamber, within the engine

operating limitations established under Part

33 of the Federal Aviation Regulations, and

approved for unrestricted periods of use

rated maximum continuous thrust

With respect to turbojet engine type

certifica-tion, means the approved jet thrust that is

de-veloped statically or in flight, in standard

at-mosphere at a specified altitude, without fluid

injection and without the burning of fuel in a

separate combustion chamber, within the

en-gine operating limitations established under

Part 33 of the Federal Aviation Regulations,and approved for unrestricted periods of use

rated takeoff augmented thrust

With respect to turbojet engine type tion, means the approved jet thrust that is de-veloped statically under standard sea levelconditions, with fluid injection or with theburning of fuel in a separate combustionchamber, within the engine operating limita-tions established under Part 33 of FederalAviation Regulations, and limited in use toperiods of not over 5 minutes for takeoff op-eration

certifica-rated takeoff thrust

With respect to turbojet engine type tion, means the approved jet thrust that is de-veloped statically under standard sea levelconditions, without fluid injection and withoutthe burning of fuel in a separate combustionchamber within the engine operating limita-tions established under Part 33 of the FederalAviation Regulations, and limited in use toperiods of not over 5 minutes for takeoff op-eration

certifica-rating

(1) A statement that, as a part of a certificate,sets forth special conditions, privileges, orlimitations (2) That class or level at which anoperator is qualified (3) That assessment of aworker's pace or output relative to the stan-dard pace or output

rating factor

That level of skill and effort displayed by anoperator during the period of study, based on100% as normal skill and effort

rating of perceived effort (RPE)

An individual's estimate of how hard a task is,

in terms of very, very light to very, very hard

Also known as rate of perceived exertion, rated perceived exertion, and rating of per-

ceived exertion See also rating of perceived

exertion scale.

rating of perceived effort scale

A 15-point scale ranging from 6 to 20 which

is used by an individual to report the amount

of effort/exertion he/she is putting forth Also

referred to as the Borg scale and perceived

exertion scale See also rating of perceived effort.

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rating scale

Any rank ordering scale for recording worker

performance

ratio

A mathematical relationship between two

numerical variables or values in which they

are expressed as a fraction (as A/B) and may

be evaluated as a quotient

ratio-delay study

A study in which a large number of

instanta-neous work samples are taken randomly

ratio estimate

The ratio of two population aggregates

(to-tals) For example, "average miles traveled

per vehicle" is the ratio of total miles driven

by all vehicles, over the total number of

vehi-cles See also estimate ratio and mean.

ratio scale

A basic measurement scale meeting the

crite-ria of an equal-interval scale and in which a

known valid zero exists such that the ratio of

numerical measures can be interpreted as a

ratio of their magnitudes

rational basis test

Under this test, an appellate court will not

second-guess the legislature as to the wisdom

or rationality of a particular statute if there is a

rational basis for enactment, and if the

chal-lenged law bears a reasonable relationship to

the attainment of some legitimate

govern-mental objective

rationalization

A defense mechanism in which a person finds

logical reasons (justification) for his/her

be-havior while ignoring the real reasons It is a

form of self-deception and is unconsciously

employed to make tolerable certain feelings,

behaviors, and motives that would otherwise

be intolerable Everyone employs

rationali-zation at some time or other and in most

in-stances it is a relatively harmless behavior

pattern The danger lies in deceiving oneself

habitually so that eventually harmful or

de-structive behavior can be justified in one's

mind Also, when investigating an accident

or incident, witnesses may tend to rationalize

as time passes Therefore, the earlier a

wit-ness interview can take place following an

ac-cident event, the better the chance of

obtain-ing more usable testimony

rattening

An offense on the part of the members of atrade union involving the taking away and/orhiding of the tools, clothes, or other property

of a worker in an attempt to compel him/her

to join the union or cease working In land, it is an offense punishable by fine or im-prisonment

raw agricultural commodity

According to the Federal Food, Drug, andCosmetic Act: Any food in its raw or naturalstate, including all fruits that are washed, col-ored, or otherwise treated in their unpeelednatural form prior to marketing

raw material

An unprocessed material or material whichhas undergone some preliminary processingelsewhere which is used as input to a proc-essing operation

deter-Raynaud's syndrome

A vascular disorder resulting in the tion of the blood vessels of the hands due tocold temperature, emotions, vibration, or un-known cause The hands become a bluish-white color due to lack of blood circulationand become painful upon exposure to cold It

constric-is associated with the operation of hand-held

or manually supported or guided machines

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that produce intense vibration in the

fre-quency range of 10 to 1000 Hz Symptoms

include pain in the fingers, loss of manual

dexterity, stiffness in the joints,

radiographi-cally observable changes in the bones and

joints, whitening and numbness in one or

more fingers of either hand, skin atrophy, and

occasionally gangrene Also referred to as

Raynaud's disease, dead hands, and vibration

RCRA Hazardous Waste Data Management

System; includes selective information on

over 324,000 sites which generate, transport,

store, treat, and/or dispose of hazardous waste

as defined by RCRA Records available in

HWDMS will eventually be transferred to the

of flexion, extension, or other joint ments to attain a point in space for some op-eration (4) A certain area of a river, usually astraight section

move-reach envelope

The volume or solid bounded proximally bythe body, clothing surface, or proximal reachand by the distal boundary in any directionwhich an individual or robotic device can at-tain by any combination or postures, rotations,flexion, and/or extension movements underspecified conditions

reach from wall, maximum

The distance from a wall to the tip of the dle finger Measured with the individual'sback and the contralateral shoulder pressedagainst the wall, the shoulder of the arm beingmeasured held as far forward as possible, withthe arm and hand extended horizontally

mid-reaction time

The time required for a person to react to astimulus

reaction time delay

A time factor used in the modeling of machine systems to simulate the human reac-tion to an event

man-reactionless tool

Any tool which compensates internally forforces or torques induced as a result of its ac-tions such that there is essentially no externalforce or torque applied to the user

reactive

Materials which by themselves or in contactwith water or other non-compatible materialsare readily capable of detonation, explosivedecomposition or explosive reaction at normaltemperatures and pressures, as well as thosematerials that are sensitive to mechanical orlocalized shock at normal temperatures andpressures

reactive muffler

Acoustics A type of muffler used to reduce

noise emissions from an engine, such as thatfrom an automobile exhaust system

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A measure of the tendency to undergo a

chemical change or reaction with the release

of energy It is the susceptibility of materials

to release energy

read-out

A meter reading or other form for displaying

visual information to an individual See also

call-out.

read the water

To navigate by visual observation of the water

surface; not recommended for newcomers

readability

A quality of text or numbers which allows

groups of related alphanumeric characters to

be easily discerned and recognized as words

or number sequences

readily accessible

Capable of being reached quickly for

opera-tion, renewal, or inspections, without

requir-ing those to whom ready access is required to

climb over or remove obstacles or to resort to

portable ladders, chairs, etc See also

acces-sible.

readiness potential

A change in cortical potential in the motor

cortex just prior to a planned, volitional

movement

readiness time

That period of time necessary for a system to

be prepared from a specified, inactive state to

a state in which it is stabilized and can

per-form its intended function

reading point

See breakpoint.

reading radius

The distance from the front of the eyeball to

the object or display to be read

reading speed

The number of words of text read per minute

by an individual

reagent

A substance that produces a chemical reaction

that can be used to detect, measure, or

pro-duce another substance

reagent blank

Materials used in sample analysis are

evalu-ated as reagent blanks to determine their

con-tribution, if any, to the analytical result

real ear attenuation at threshold (REAT)

A methodology for determining the tion provided by a hearing protection devicefitted in a prescribed manner on a group ofnormal wearers

attenua-real-ear protection at threshold

The mean value in decibels of the occludedthreshold of audibility (hearing protector inplace) minus the open threshold of audibility(ears open and uncovered) for all listeners onall trials under otherwise identical test condi-tions

real time

(1) General Having essentially no

percepti-ble delay between the occurrence of an eventand the knowledge of the event at another lo-cation Also, having a control system whichdelivers the necessary inputs to the systembeing controlled at or prior to the times they

are required (2) Instrumentation An

in-strument that responds to and indicates acontaminant concentration or level of a physi-cal agent as changes are occurring

realistic job preview (RJP)

A pre-employment description or employee orientation in which accurate andprecise information about the job is related tothe individual

new-realizable

Pertaining to a component or system which isphysically manufactured, not merely theoreti-cal

ex-rear axle capacity

The factor and/or Society of Automotive gineers (SAE) recommended maximum loadthat a rear axle assembly is designed to carry

En-as rated at the ground and expressed inpounds

rear end collision

(1) A collision in which one vehicle collideswith the rear of another vehicle (2) A colli-sion in which the trains or locomotives in-volved are traveling in the same direction onthe same track (3) A collision of the front of

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one vehicle with the rear of another vehicle.

Also called rear-end.

rear extremity

Transit The rearmost point on a vehicle

when the vehicle's cargo doors, tailgate, or

other permanent structure are positioned as

they normally are when the vehicle is being

driven Non-structural protrusions such as tail

lights, hinges, and latches are deleted from the

determination of the rearmost point

rear overhang

Transit The distance from the center of the

rear axle to the end of the frame

rear projection

Pertaining to a display which is presented to

one side of a translucent screen for viewing

from the other side

rearrange tow

Maritime To shift barges in tow.

reasonable accommodation

Under the Americans with Disabilities Act

(ADA), that modification to the workplace or

other environment which enables a qualified

handicapped individual to work in a given

situation and does not impose an undue

hard-ship on an employer

reasonable act

Such as may fairly, justly, and reasonably be

required of a party

reasonable and probable cause

Such grounds as to justify anyone suspecting

another person of a crime, and placing him or

her in custody based on those grounds It is a

suspicion founded upon circumstances

suffi-ciently strong to cause a reasonable person to

believe that a charge is true

reasonable care

Law Such a degree of care, precaution, or

diligence as may fairly and properly be

ex-pected or required, having regard to the nature

of the action, or of the subject matter, and the

circumstances surrounding the transaction It

is such care as an ordinary prudent person

would exercise under the conditions existing

at the time he/she is called upon to act

Sub-stantially synonymous with ordinary care or

due care It should be noted that a "high

de-gree of care" is not the legal equivalent of

rea-sonable care It is that degree of care which a

very cautious, careful, and prudent person

would exercise under the same or similar cumstances; a degree of care commensurate

cir-with the risk of danger See also ordinary care.

reasonable cause

A basis for arrest without warrant exists whenthe facts would lead a person of ordinary careand prudence to believe and conscientiouslyentertain an honest and strong suspicion thatthe person subject to the arrest is guilty of

committing a crime See also reasonable and

probable cause.

reasonable compensation

The sum which would reasonably compensate

a person for injuries, for pain and suffering,and for past, present, and future expenses rea-sonably necessary or incidental to his/her ef-forts to alleviate injuries and all pecuniarylosses suffered, or to be suffered, as a result of

an inability to engage in his/her usual pation

occu-reasonable diligence

OSHA’s expectation that an employer is able for conditions or practices which shouldreasonably have been known of and/or takingpreventive actions OSHA believes employ-ers have an affirmative duty to monitor itsworkplace safety and become knowledgeable

li-of all hazards that may be present there

to themselves It is doubt based on reasonwhich arises from evidence or lack of evi-dence

reasonable force

That degree of force which is not excessiveand is appropriate in protecting oneself and/orone's property When such force is used, a

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person is justified and is not criminally liable,

nor is he/she liable in tort

reasonable grounds

Reasonable grounds within a statute

author-izing an arrest without a warrant by an officer

who has reasonable grounds for believing that

a person to be arrested has committed a

criminal offense means substantially probable

cause.

reasonable man doctrine

The standard which one must observe to

avoid liability for negligence is the standard

of the reasonable man under all

circum-stances, including the foreseeability of harm

to another person (such as a plaintiff)

reasonably available control technology (RACT)

The lowest emissions limit that a particular

source is capable of meeting by the

applica-tion of control technology that is both

rea-sonably available, as well as technologically

and economically feasible RACT is usually

applied to existing sources in nonattainment

areas and in most cases is less stringent than

new source performance standards

REAT

See real ear attenuation at threshold.

reboot

Computing The act of restarting a computer

by reloading the operating system You can

reboot some computers by pressing the RESET

button On all personal computers, the user

can reboot or "warm boot" by pressing the

CTRL+ALT+DEL keys on the keyboard (press

all keys at the same time)

rebuild

A complete repair of a component with the

objective of returning it as nearly as possible

to its original and/or performance

characteris-tics

rebuilt caboose

A caboose that has undergone overhaul which

has been identified by the railroad as a capital

expense under Interstate Commerce

Commis-sion accounting standards

rebuilt locomotive

A locomotive that has undergone overhaul

which has been identified by the railroad as a

capital expense under Interstate Commerce

Commission accounting standards

rebuilt passenger car

A passenger car that has undergone overhaulwhich has been identified by the railroad as acapital expense under Interstate CommerceCommission accounting standards

rebuttable presumption against registration (RPAR)

See special review.

recall

(1) A statement by a manufacturer or tributor of some item that it may have one ormore defects and should be returned for re-placement or repair (2) To access informa-tion stored in memory and output that infor-mation

dis-receiver

A device on a locomotive, so placed that it is

in position to be influenced inductively oractuated by an automatic train stop, train con-trol, or cab signal roadway element

receiver coil

Concentric layers of insulated wire woundaround the core of a receiver of an automatictrain stop, train control, or cab signal device

on a locomotive

receiver operating characteristic (ROC)

A graphical presentation of detector ance in signal detection theory, including thecombined effects of sensitivity and response

perform-bias on operator performance See also signal detection theory.

receiving

That organization or those activities involved

in the receipt and distribution within the plant

of raw materials, equipment, and suppliesfrom external sources

receiving waters

A river, lake, ocean, stream, or other course into which wastewater or treated efflu-ent is discharged

water-recency error

An error due to recent events which bias a

rating or other measure Also called recency

of events error.

receptacle

(1) General, Electrical A contact device

in-stalled at the outlet for the connection of a

single attachment plug (2) Single Receptacle.

A single contact device with no other contact

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device on the same yoke (3) Multiple

Re-ceptacle A single device containing two or

more receptacles (4) Transit – Freight A

containment vessel for receiving and holding

materials, including any means of closing

receptacle outlet

An outlet where one or more receptacles are

installed

reception minimum altitude

The lowest altitude at which an intersection

can be determined

receptive field

A region of the skin, retina, or other structure

having an extended sensory apparatus within

which appropriate stimulation affects the

re-sponse of a given sensory neuron

receptor

Binding site that has a high affinity for a

par-ticular ligand Receptors interact with

bio-logically endogenous ligands, facilitating

in-tracellular communication Many chemicals

interact with receptors, producing a variety of

toxic effects

recessed

Pertaining to any device or object which is

embedded, either entirely or in part, within

another structure such that the device or

ob-ject is still visible

recharge

The process by which water is added to a zone

of saturation, usually by percolation from the

soil surface, e.g., the recharge of an aquifer

recharge area

A land area in which water reaches to the

zone of saturation from surface infiltration,

e.g., an area where rainwater soaks through

the earth to reach an aquifer

reciprocal color temperature

A chromaticity measure which more nearly

provides equal perceptible divisions of color

temperature

reciprocating pedal

A foot-operated device which operates as a

member of a pair of pedals by moving in

op-posing directions about a common shaft with

a rotational capability limited by the pedal

ra-dial motion

reckless endangerment

A statutory offense committed by creating asubstantial risk of death or serious injury toanother

reckless homicide

A species of statutory homicide in some statescharacterized by a willful and wanton disre-gard of consequences and resulting in death

In some states, it may amount to ter

reclamation

The restoration of land, water, or waste rials to usefulness through methods such assanitary landfill, wastewater treatment, ormaterial recovery

mate-Reclamation Act

The Reclamation Act of 1902 authorized theSecretary of the Interior to locate, construct,operate, and maintain works for the storage,diversion, and development of waters for thereclamation of arid and semiarid lands in theWestern States

reclining

Pertaining to a posture involving an diate position between sitting and lying inwhich the posterior aspect of the body isagainst some reference surface, with the torsoapproximately between 45° and horizontal,and some degree of flexion of the hips andknees

interme-recognition

The process in which an observer interprets orcomputer process matches with data in mem-ory the information available from a stimulus

or object to arrive at a conclusion about thestimulus or object

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concept of "recognized hazard" is a critical

element in the OSHA compliance process,

es-pecially with regard to the employer's General

Duty under Section 5(a)(1) of the OSHAct

The contention is that a hazard must first be

"recognized" as such before any attempts can

be made to remove or control it However, it

must be clearly understood that ignorance of a

hazard or hazardous condition does not

ele-vate the responsibility to eliminate or control

it OSHA has clearly established a position

that places this burden of knowledge directly

on the employer If the employer should have

known or, with the practice of reasonable

diligence, could have known about the hazard,

then the employer is still required to and

obli-gated to control or remove the hazard See

also General Duty Clause.

recombinant bacterium

A type of microorganism whose genetic

makeup has been deliberately altered by

in-troduction of new genetic elements

recombinant DNA (rDNA)

The new DNA that is formed by combining

pieces of DNA from different organisms or

cells

recommended daily allowance (RDA)

That amount of a specified mineral, vitamin, or

other substance which is recommended for

normal health

recommended exposure limit (REL)

An occupational exposure limit recommended

by NIOSH as being protective of worker

health over a working lifetime

recommended maximum contaminant level

(RMCL)

The maximum level of a contaminant in

drinking water at which no known or

antici-pated adverse affect on human health would

occur, and which includes an adequate margin

of safety Recommended levels are

non-enforceable health goals See maximum

con-taminant level

recompression therapy

The treatment for decompression sickness

using a hyperbaric chamber to increase the

ambient pressure

reconciling items

Items where accounting practices vary for

handling these expenses as a result of local

ordinances and conditions Reconciling itemsinclude depreciation and amortization, interestpayments, leases and rentals They are calledreconciling items because they are needed toprovide an overall total that is consistent withlocal published reports

reconstructed source

An existing facility in which components arereplaced to such an extent that the fixed capi-tal cost of the new components exceeds 50percent of the capital cost that would be re-quired to construct a comparable entirely newfacility New source performance standardsmay be applied to sources which are recon-structed after the proposal of the standard if it

is technologically and economically feasible

to meet the standard

record of decision (ROD)

A public document that explains whichcleanup alternative(s) will be used at NationalPriorities List sites where, under CERCLA,Trust Funds pay for the cleanup

recordable occupational injuries and illnesses

Under OSHA 29 CFR 1904.12(c), any pational injuries or illnesses which result in:a) fatalities, regardless of the time be-tween the injury and death, or thelength of the illness; or

occu-b) lost workday cases, other than fatalities,that result in lost workdays; or

c) nonfatal cases without lost workdayswhich result in transfer to another job

or termination of employment, or quire medical treatment (other than firstaid) or involve loss of consciousness orrestriction of work or motion Thiscategory also includes any diagnosedoccupational illnesses which are re-ported to the employer but are not clas-sified as fatalities or lost workdaycases

re-recording thermometer

A thermometer with a recording device used

to obtain a permanent record of temperature

records retention policy

A systematic procedure for the retention anddestruction of an organization’s documents.Retention periods may be driven by businessconsiderations and not requirements of law.Failure to retain documents in the face of dis-covery in litigation can result in evidentiary

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implications as well as creating a risk of

criminal penalties The policy is also part of

the compliance program as government

in-vestigators will also check an organization’s

records to determine compliance with

regula-tory document retention requirements Also

referred to as document retention policy.

recoverable light loss factor

Any light loss factor due to conditions which

can be remedied through activities such as

maintenance, normal servicing, or cleaning,

specifically including lamp burnout, lumen

depreciation, luminaire dirt depreciation, and

room surface dirt depreciation

recoverable resources

Materials that still have useful physical,

chemical, or biological properties after

serv-ing their original purpose and can, therefore,

be reused or recycled for the same or other

purposes

recoverable solid waste

Under the Federal Solid Waste Disposal Act:

The capability and likelihood of being

recov-ered from solid waste for a commercial or

in-dustrial use

recovered resources

Under the Federal Solid Waste Disposal Act:

Material or energy recovered from solid

waste

recovered solid waste material

Under the Federal Solid Waste Disposal Act:

Waste material and byproducts which have

been recovered or diverted from solid waste

recovery efficiency

The ratio, expressed as a percentage, of the

amount of a material recovered from a

sam-pling media to the amount placed on/in the

media

recreational boat

(1) Any vessel manufactured or used

primar-ily for noncommercial use; leased, rented or

chartered to another for the latter's

noncom-mercial use (2) Any vessel engaged in the

carrying of six or fewer passengers

recruit

To search for possible new employees

rectangular coordinate system

A dimensional coordinate system composed

of n perpendicular axes, where n is any

posi-tive integer value Also referred to as sian coordinate system.

A segment of the large intestine just proximal

to the anal canal

rectus abdominis muscle

A voluntary skeletal muscle which has a cal extent and is located over the abdomenjust lateral to the midline of the body

pos-recumbent length

The length of the body from the top of thehead to the bottom of the heels Measuredwith the individual lying on a flat, hard sur-face (e.g., a recumbent-length table), the headpositioned such that the line of sight is verti-cal, the hips and knees fully extended, and thelongitudinal axis of the feet vertical

recumbent-length table

A hard, flat surface, which is wider than theshoulders, and which has a fixed headboardand a sliding/removable baseboard for meas-uring lengths while the subject is lying down

recycle/reuse

The process of minimizing the generation ofwaste by recovering usable products thatmight otherwise become waste

recycled air

That portion of the atmospheric gases retained

in a ventilation system for recirculation

recycled material

A material that is utilized in place of a mary, raw, or virgin material in manufactur-ing a product They consist of consumer

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pri-waste, industrial scrap, materials from

agri-cultural product waste, and others

recycled oil

Under the Federal Solid Waste Disposal Act:

Any used oil which is reused, following its

original use, for any purpose (including the

purpose for which the oil was originally

used) Such term includes oil which is

re-fined, reclaimed, burned, or reprocessed

recycling

The reuse of materials ordinarily considered

waste, whether hazardous or nonhazardous

red

A primary color, corresponding to that hue

apparent to the normal eye when stimulated

with electromagnetic radiation approximately

An EPA document that is undergoing final

review before being submitted for final

man-agement decision

red marrow

That type of marrow which produces certain

types of blood cells, including erythrocytes

red muscle

A skeletal muscle which appears in the fresh

or living state, probably due to muscle

hemo-globin and cytochrome, and which has a

longer latency than white muscle

red-out

A condition in which vision appears blurred

by a red mist due to centripetal (negative g)

accelerations

red tide

A proliferation of a marine plankton that is

toxic and often fatal to fish This natural

phe-nomenon may be stimulated by the addition

of nutrients A tide can be called red, green or

brown, depending on the coloration of the

plankton

redirect examination

An examination of a witness by the direct

examiner subsequent to the cross-examination

of the witness

reduced comfort boundary

A set of limits representing the maximum posure time for whole-body vibration in dif-ferent frequency ranges

ex-reduction

Used to indicate the slower output speed sulting from a ratio proportion (faster on re-

re-ductions of less than 1) a) Single Reduction.

A single set of reducing gears in the rear axle

b) Double Reduction An additional gear-set

in the rear axle to reduce output speed further.May or may not be used as a 2-speed rearaxle

reef area

An area identified as a danger to maritimenavigation containing one or more chains ofrocks or coral, at or near the surface of thewater

reef pool

Pocket of sea/ocean completely surrounded by

a coral reef

reefer

Transit (slang) Refrigerated truck or trailer

designed for hauling perishables

reefing current

Current where the swift water reaches theslack water and creates boils or continuesboils or turbulent water It is considered theedge of the reef or what would be a reef wereone there

re-entrainment

A situation that occurs when the air beingexhausted from a building is immediatelybrought back into the system through the airintake and other openings in the building en-velope

reentry

A return to the work force or other aspect ofsociety following a period of absence

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reentry interval

The period of time immediately following the

application of a pesticide during which

un-protected workers should not enter a field

referee fluid

A compatible fluid, other than that used

dur-ing normal system operations, that is used for

test purposes because it is safer due to

char-acteristics such as less (or non-) explosive,

flammable, or toxic, and/or it is easier to

de-tect

reference dose (RfD)

Toxicity value used most often in evaluating

noncarcinogenic effects resulting from

expo-sures at Superfund sites See specific entries

for chronic RfDs, subchronic RfDs, and

A hypothetical aggregation of human physical

and physiological characteristics arrived at by

international consensus For example, the

weight, height, and other physical dimensions

are presented for what has been agreed to as

the reference man Also referred to as the

standard man.

referent power

The ability of management to gain support for

a project because personnel are personally

at-tracted to the manager or interested in the

project

referred pain

A pain which is felt at one location, but which

represents a disorder at another location

refined petroleum pipelines

Establishments primarily engaged in the

pipeline transportation of refined products of

petroleum, such as gasoline and fuel oil

refined petroleum products

Refined petroleum products include but are

not limited to gasoline, kerosene, distillates

(including No 2 fuel oil), liquefied petroleum

gas, asphalt, lubricating oils, diesel fuels, and

residual fuels

reflectance

A measure of the ratio of the luminance of a

surface to the illumination on the surface

of the wave incident on that surface or

bound-ary Also referred to as coefficient of tion.

reflec-reflective material

A material conforming to Federal tion L-S300, "Sheeting and Tape, Reflective;Non-exposed Lens, Adhesive Backing,"(September 7, 1965) meeting the performancestandard in either Table 1 or Table 1A of So-ciety of Automotive Engineers (SAE) Stan-dard J594f, "Reflex Reflectors" (January,

Specifica-1977) See also left bank, reflex reflector, retro-reflective material, and right bank.

by deflection of a nerve impulse that does notpenetrate the level of consciousness

recep-reflex reflector

A device which is used on a vehicle to give anindication to an approaching driver by re-flected light from the lamps on the approach-

ing vehicle See also reflective material.

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A chart recorder for displaying graphically the

magnitude of a musculoskeletal reflex

reflexometer

An instrument used to measure the force

re-quired to elicit a reflex

reflux esophagitis

A burning sensation in the thorax, generally

due to stomach acid refluxing through the

lower esophageal sphincter Commonly

re-ferred to as heartburn.

reformulated gasoline

(1) Gasoline whose composition has been

altered in order to reduce evaporation and

ex-haust emissions that contribute to ozone

for-mation (2) Motor gasoline, formulated for

use in motor vehicles, the composition and

properties of which are certified as

reformu-lated motor gasoline by the Environmental

Protection Agency

refract

Change the direction of an energy wave on

passing from one medium to another in which

the wave has a different velocity

refraction

(1) Illumination The bending of light as it

passes from one medium to another (2)

Acoustics The bending of a sound wave from

its original path due to its passing from one

medium to another, or due to a temperature or

wind gradient (3) Anatomy Determination

of the refractive errors of the eye and their

correction by glasses

refractory period

See cellular refractory period.

refrigerant

A substance that will absorb heat while

va-porizing and whose boiling point and other

properties make it useful as a medium for

Conversion of solid waste into useful

prod-ucts, e.g., composting organic wastes to make

soil conditioners or separating aluminum andother metals for melting and recycling

regeneration

Manipulation of individual cells or masses ofcells to cause them to develop into wholeplants

regional administrator

A person appointed by the Administrator ofthe EPA for one of its several geographic re-gions

regional distribution port

Waterfront area which a) is identifiable with

a Standard Metropolitan Statistical Area(SMSA) as defined by the U.S Bureau ofCensus, b) has 10 or more commercial termi-nal facilities located within a reasonable dis-tance of the general area, c) is served by atleast two Class I railroads, and d) is served by

at least five interstate or U.S highways

regional response team (RRT)

Representatives of federal, local, and stateagencies who may assist in coordination ofactivities at the request of the On-Scene Co-ordinator before and during a Superfund re-sponse action

register

A fixture through which air is returned to a

ventilation system Also referred to as a turn air register.

re-register breadth

Maritime The breadth of a vessel at its

wid-est part measured from the outer side of theplanking or plating on one side to the corre-sponding point on the opposite side

register depth

Maritime The depth of a vessel measured

from the underside of the tonnage deck, ship, to the bottom of the hold The depth isnot the draft of a vessel

amid-registered active general aviation aircraft

A civil aircraft registered with the FAA thathas been flown one or more hours during theprevious calendar year Excluded are aircraftowned and operated in regularly scheduled,non-scheduled, or charter service by commer-cial air carriers and aircraft in excess of12,500 pounds maximum gross takeoffweight, and owned and operated by a com-mercial operator certificated by the FAA toengage in intrastate common carriage

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registered aircraft

Aircraft registered with the Federal Aviation

Administration

registered inspector

A person registered with the Department [of

Transportation (DOT)] in accordance with 49

CFR 107 Subpart F who has the knowledge

and ability to determine if a cargo tank

con-forms with the applicable DOT specification

and has, at a minimum, any of the

combina-tions of education and work experience in

cargo tank design, construction, inspection, or

repair set out in 49 CFR 171.8

registrant

Any manufacturer or formulator who obtains

registration for a pesticide active ingredient or

product

registration

Formal listing with EPA of a new pesticide

before it can be sold or distributed in intra- or

interstate commerce The product must be

registered under the Federal Insecticide,

Fun-gicide, and Rodenticide Act EPA is

responsi-ble for registration (pre-market licensing) of

pesticides on the basis of data demonstrating

that they will not cause unreasonable adverse

effects on human health or the environment

when used according to approved label

direc-tions

registration standards

Published reviews of all the data available on

pesticide active ingredients

Registry of Toxic Effects of Chemical

Sub-stances (RTECS)

A five-volume NIOSH compilation listing the

toxicity data of over 80,000 compounds

regression

(1) General Return to an earlier or primitive

state (2) Statistics A statistical procedure

which is employed to establish a relationship

between two variables to enable the prediction

of the values of one variable, Y (dependent

variable), to those which correspond to given

values of the other variable, X (independent

variable) (3) Medicine Subsidence of

symptoms or of a disease process (4)

Biol-ogy The tendency in successive generations

toward mediocrity (5) Psychology A mental

mechanism utilized to resolve conflict or

frustration by returning to a behavior that was

successful in earlier years

regression equation

An equation in which the value of a criterionvariable may be predicted from one or moreknown predictor variable values

regression line

A graphic line or a linear equation ing a linear or approximately linear functionwhich may be used for predicting the value ofone variable from a set of known values

represent-regression model

The use of regression techniques to explainprojections

regular course of business

Worker's Compensation The habitual or

regular occupation that a party is engaged in,with the intent of winning livelihood or somegain, excluding incidental or occasional op-erations arising out of the transaction of thebusiness

regular element

A job element which is performed at leastonce in each work cycle or operation

regular grade gasoline

A grade of unleaded gasoline with a loweroctane rating (approximately 87) than othergrades Octane boosters are added to gasoline

to control engine preignition or "knocking" by

slowing combustion rates See also gasoline.

regular leaded gasoline

Gasoline having an antiknock index (R+M/2)greater than or equal to 87 and less than orequal to 90 and containing more than 0.05grams of lead or 0.005 grams of phosphorus

per gallon See also gasoline.

regular sampling

The continuous or intermittent (at a relativelyfixed frequency) taking of a representativeportion of the material being sampled

regular unleaded gasoline

Gasoline having an antiknock index (R+M/2)greater than or equal to 85 and less than 88,

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and containing not more than 0.05 grams of

lead or 0.005 grams of phosphorus per gallon

See also gasoline.

regularly employed driver

A driver who, in any period of 7 consecutive

days, is employed or used as a driver solely

by a single motor carrier

regulated area

Under many OSHA criteria, an area where

exposure to a regulated airborne contaminant

or physical stress agent is, or can be expected

to be in excess of an OSHA permissible

expo-sure limit

regulated motor carrier

A carrier subject to economic regulation by

the Interstate Commerce Commission

regulation

(1) A rule of general application and future

effect promulgated by an agency with

juris-diction Distinguished from a legislation

which is a statute or act of a legislature made

up of elected representatives of the public

Federal regulations are codified in the Code of

Federal Regulations (CFR) (2) Any agency

statement of general or particular applicability

designed to implement, interpret, or prescribe

policy in order to carry out the purpose of a

law Synonymous with rule, it has the force

of law

regurgitation

Abnormal backward progression of fluids or

other vessel contents, as the return of

undi-gested food from the stomach to the oral

cav-ity, or of blood through valves of the heart

rehabilitate

Use one or more forms of treatment in an

at-tempt to restore some or all loss of capacity or

develop residual capabilities to give an

indi-vidual a maximal state of independence

rehabilitation

The process of restoring a person's ability to

live and work as normally as possible after a

disabling injury or illness It aims to help the

patient achieve maximum possible physical

and psychologic fitness and regain the ability

to care for himself/herself It offers assistance

with the learning or relearning of skills

needed in everyday activities, with

occupa-tional training and guidance and with

psy-chologic readjustment Rehabilitation is anintegral part of convalescence

rehearsal

The process of recycling information inworking memory to maintain it within work-ing memory or to store it in long-term mem-ory

rehydration

The restoration of water or fluid content to abody or to a substance that has become dehy-drated

Reid vapor pressure (RVP)

The vapor pressure of a liquid at 200ºF, asdetermined by a standard laboratory proce-dure (ASTM Test D-23) and expressed inpounds per square inch absolute

Reid's base line

An imaginary line defined by the location ofthe auricular point and the lowest point of theorbit on the same side of the head, with ananterior-posterior extent

weakening, respectively, of that response See

positive reinforcement and negative forcement.

reject allowance

A special time allowance provided a workerfor processing rejects from a process or forrework

reject staging

Reverse osmosis process configuration wherethe overflow water from one stage is used asfeed water on subsequent stage to increase

water recovery Also called brine staging.

rejection

The immune reaction of the recipient to eign tissue cells (antigens) after homografttransplantation, with the production of anti-

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for-bodies and ultimate destruction of the

trans-planted organ

REL

See recommended exposure limit.

relapsing fever

Any one of a group of similar infectious

dis-eases transmitted to man by the bites of lice

and ticks, and marked by alternating periods

of normal temperature and periods of fever

relapse The diseases in the group are caused

by several different species of spirochetes

belonging to the genus Borrelia Generally,

relapsing fever starts with a sudden high fever

of 104 to 105ºF, accompanied by chills,

head-ache, muscle aches, nausea, and vomiting

There may also be jaundice and a rash The

attack lasts 2 or 3 days, after which the

symptoms disappear by crisis, with profuse

sweating accompanying the rapid drop in

temperature In elderly people, this may be

accompanied by collapse, in which the heart

and respiratory system function poorly After

3 or 4 days, there is a relapse and the

symp-toms return to their former severity The

cy-cle continues through four or more attacks

be-fore the disease has run its course Relapsing

fevers are rarely fatal, but they can be serious

relationship

An interdependence between individuals,

ac-tivities, or entities

relationship chart

A table which details what the response for

carrying out some task should be for several

possible situations

relationship diagramming

The process of examining various plant

lay-outs with the intent to optimize according to

the closeness of relationships within an

orga-nization

relative biological effectiveness (RBE)

The ratio of the number of rads of gamma

radiation or x-radiation of a certain energy

that will produce a specified biological effect

to the number of rads of another radiation

re-quired to produce the same effect Typically,

com-of 100% is about 2.5% total water vapor inair, by volume

move-relative standard deviation

See coefficient of variation.

A reach which can be attained without having

to strain or requiring maximal flexion and/orextension of limbs

relayed cut-section

Rail Operations A cut-section where the

energy for one track circuit is suppliedthrough front contacts or through front andpolar contacts of the track relay for the ad-joining track circuit

relearning time

The time required for a previous user to achieve a previous level of competence fol-lowing a period of non-use of skill or training

re-release

(1) General To let go; to no longer hold or

contend a claim of ownership over a

particu-lar thing (2) CERCLA Any spilling,

leak-ing, pumpleak-ing, pourleak-ing, emittleak-ing, emptyleak-ing,discharging, injecting, escaping, leaching,dumping, or disposing of hazardous sub-stances into the environment SARA included

in this definition the abandonment or carding of barrels, containers, and otherclosed receptacles containing any hazardous

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dis-substances or pollutant contaminant It

ex-cludes any release which results in exposure

to persons solely within a workplace, with

re-spect to a claim which such persons may

as-sert against the employer of such persons;

emissions from the engine exhaust of a motor

vehicle, rolling stock, aircraft, vessel, or

pipe-line pumping station engine; or release of

source, byproduct, or special nuclear material

from a nuclear incident as those terms are

de-fined in the Atomic Energy Act of 1954 if

such release is subject to requirements with

respect to financial protection established by

the Nuclear Regulatory Commission

release load

A work element in which an object is

re-leased

release rate

Under the Federal Organotin Antifouling

Paint Control Act of 1988: The rate at which

organotin is released from an antifouling paint

over the long term, as determined by the EPA

Administrator using a) the American Society

for Testing Materials (ASTM) standard test

method which the EPA required in its July 29,

1986, data call-in notice on tributyltin

com-pounds used in antifouling paints; or b) any

similar test method specified by the

Adminis-trator

relevance tree

A means of organizing and presenting

inter-related variables or problems in graphic form

for better visualization through the use of

nodes and branches

relevant evidence

Evidence tending to prove or disprove an

al-leged fact

reliability

(1) General An expression of the level of

confidence that a given system or product will

function, and continue to function, as intended

throughout the life cycle (2) Instrumentation.

The ability of an instrument and its

compo-nents to retain their operating performance

characteristics over a reasonable period of

use A statistical term having to do with the

probability that an instrument's repeatability

and accuracy will continue to fall within

specified limits This is a very important

characteristic for instruments which are to be

used in field applications

reliability coefficient

The correlation coefficient between two

suc-cessive performance samples Also called efficient or reliability.

relocated threshold

Aviation A threshold located at a point on

the runway other than the beginning of therunway pavement The portion of pavementbehind a relocated threshold that is not avail-able for takeoff

remedial action (RA)

(1) The actual construction or implementationphase of a Superfund site cleanup that followsremedial design (2) Those actions consistentwith permanent remedy taken instead of or inaddition to removal actions in the event of arelease or threatened release of a hazardoussubstance into the environment, to prevent orminimize the release of hazardous substances

so that they do not migrate to cause tial danger to present or future public health

substan-or welfare substan-or to the environment (3) The tual construction or implementation phase of aSuperfund site cleanup that follows remedialdesign

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ac-remedial design (RD)

A phase of environmental remedial action that

follows the remedial investigation/feasibility

study (RI/FS) and includes development of

engineering drawings and specifications for

site cleanup

remedial investigation (RI)

An in-depth study designed to gather the data

necessary to determine the nature and extent

of contamination at a Superfund site; establish

criteria for cleaning up the site; identify

pre-liminary alternatives for remedial actions; and

support the technical and cost analyses of the

alternatives The remedial investigation is

usually performed in tandem with the

feasi-bility study, hence the acronym "RI/FS." See

also feasibility study.

remedial maintenance

See corrective maintenance.

remedial project manager (RPM)

The EPA or state official responsible for

over-seeing remedial action at a site

remedial response

A long-term action that stops or substantially

reduces a release or threat of a release of

haz-ardous substances that is serious but not an

immediate threat to public health

remnant

(1) That portion of raw material, part, or

com-ponent remaining after some process (2)

That portion of an actual system output which

is unaccounted for or unexplained by the

sys-tem model Usually refers to linear models

remote

In terms of probability of hazard or mishap

occurrence, a hazard or event whose

occur-rence during the life of an item is considered

unlikely, but still possible

remote areas

Sparsely populated areas such as mountains,

swamps, and large bodies of water

remote cause

In the law of negligence with respect to an

injury or an accident, a cause which would

not, according to experience of mankind, lead

to the event which happened One where the

effect is uncertain, vague, or indeterminate,

and where the effect does not necessarily

fol-low

remote communications outlet (RCO)

Aviation Unmanned communications facility

remotely controlled by air traffic personnel

remote indicator

An instrument or display for showing tions at a point some distance away from thesensing device

removal costs

Under the Federal Oil Pollution Act of 1990:The costs of removal that are incurred after adischarge of oil has occurred or, in any case inwhich there is a substantial threat of a dis-charge of oil, the costs to prevent, minimize,

or mitigate oil pollution from such an dent

inci-remove

(1) Under CERCLA: The cleanup or removal

of released hazardous substances from the vironment, such actions as may be necessary

en-to take in the event of the threat of release ofhazardous substances into the environment,such as actions as may be necessary to moni-

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tor, assess, and evaluate the release or threat

of release of hazardous substances, the

dis-posal of removed material, or the taking of

such other actions as may be necessary to

prevent, minimize, or mitigate damage to the

public health or welfare or to the

environ-ment, which may otherwise result from a

re-lease or threat of rere-lease (2) Under the

Fed-eral Oil Pollution Act of 1990: Containment

or removal of oil or a hazardous substance

from water and shorelines or the taking of

other actions as may be necessary to minimize

or mitigate damage to the public health or

welfare, including, but not limited to, fish,

shellfish, wildlife, and public and private

property, shorelines and beaches (3) Under

the Federal Water Pollution Control Act:

Containment and removal of the oil or

haz-ardous substances from the water and

shore-lines or the taking of such other actions as

may be necessary to minimize or mitigate

damage to the public health or welfare,

in-cluding, but not limited to, fish, shellfish,

wildlife, and public and private property,

shorelines and beaches

renal

Related to or associated with the kidney

renege

That customer or user behavior in which an

individual leaves the queue or line after

wait-ing for some period of time

renewable energy

Energy obtained from sources that are

essen-tially inexhaustible (unlike, for example, the

fossil fuels, of which there is a finite supply)

Renewable sources of energy include wood,

waste, photovoltaic, and solar thermal energy

rental of railroad cars

Establishments primarily engaged in renting

or leasing railroad cars, whether or not also

performing services connected with the use

thereof, or in performing services connected

with the rental of railroad cars

rep

See roentgen equivalent physical.

repair

(1) Systems To restore that which is

inoper-able or operinoper-able only at reduced capability to

full capability by replacement of components,

assemblies, or subsystems (2) Medical The

physical or mechanical restoration of

dam-aged tissues, especially the replacement ofdead or damaged cells in a body tissue or or-gan by healthy new cells

repeat violation

OSHA As defined in case law, if the same

standard has been violated more than once bythe same employer and there is a substantialsimilarity of violative elements between cur-rent and prior violations, the violation will beconsider “repeated.”

repeatability

(1) Instrumentation The ability of an

instru-ment to reproduce readings repeatedly when

sampling the same concentration (2) pling The closeness of agreement between

Sam-samples that are collected simultaneously

repeated measures design

An analysis of variance technique in whicheach subject is exposed to more than one con-dition

repetitive element

See regular element.

Repetitive motions, especially those which place the joints in awkward positions can lead to serious injuries

repetitive motion injury (RMI)

Any of a class of pathologies created throughexcessively frequent use of a particular joint

or tissue, especially in combination withawkward positioning, inadequate or no restperiods, or excessive loads Also referred to

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as cumulative trauma disorder, repetitive

strain injury, repetitive trauma disorder,

re-petitive stress injury, and overuse syndrome.

repetitive strain injury

See repetitive motion injury.

repetitive stress injury

See repetitive motion injury.

repetitive time method

See repetitive timing.

repetitive timing

A work measurement time study technique in

which the duration of each work element is

measured and recorded in sequence as it is

performed, then the timing device is

immedi-ately reset to zero to begin timing the duration

of the next element Also referred to as

re-petitive time method, discontinuous timing,

flyback timing, snapback method, and

snap-back timing.

repetitive trauma disorder

See repetitive motion injury.

repetitive work

A work activity in which the work or task

elements are continuously repeated over a

prolonged period of time

replace

To substitute one unit for another or to return

something to its original position

replacement air

Air supplied to a space to replace exhausted

air See also make-up air (the two terms are

synonymous)

replacement standard

The estimated useful life of a motor vehicle

expressed in time (months or years) and/or

utilization (miles)

replacement therapy

The use of synthetic substances or substances

recovered from natural sources to substitute

for an organ, gland, or other body structure

which is no longer present or has ceased

functioning

replacement vehicle

A vehicle acquired to replace a vehicle in

in-ventory that meets the replacement standard

or becomes uneconomical to retain in service

replicate

To conduct an experiment which uses thesame methodology but is independent of apreviously conducted experiment

replicate samples

More than one sample collected at the sametime and place for the purpose of determiningtheir reproducibility

report writer

Software which can transform database,spreadsheet, or other information into a hard-copy format which is understandable bysomeone not familiar with the software May

also be referred to as report generator.

reportable accident

(1) Safety Any accident that meets the

crite-ria established under 29 CFR 1904 and must

be reported on the OSHA 200 Log (an annualreport summarizing occupational injuries and

illnesses) (2) Transit A motor vehicle

acci-dent involving a carrier subject to the partment of Transportation Act, which results

De-in a fatality, De-injury, or property damage of

$4,400 or more

reportable damage

Rail Operations Includes labor costs and all

other costs to repair or replace in kind aged on-track equipment, signals, track, trackstructures, or roadbed Reportable damagedoes not include the cost of clearing a wreck;however, additional damage to the abovelisted items caused while clearing the wreck is

dam-to be included in your damage estimate amples of other costs included in reportabledamage are a) rental and/or operation of ma-chinery such as cranes, bulldozers, etc in-cluding the services of contractors, to replace

Ex-or repair the track right-of-way and associatedstructures; and b) costs associated with therepair or replacement of roller bearings onunits that were derailed or submerged in water(replacement costs mean the labor costs re-sulting from a wheel set change out)

reportable death, injury or illness

Railroad Any event arising from the operation

of a railroad which results in a) death to one

or more persons; b) injury to one or morepersons, other than railroad employees, thatrequires medical treatment; c) injury to one

or more employees that requires medicaltreatment or results in restriction of work or

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motion for one or more days, one or more lost

workdays, transfer to another job, termination

of employment, or loss of consciousness; or

d) any occupational illness of a railroad

em-ployee, as diagnosed by a physician

reportable quantity (RQ)

The quantity of a hazardous substance that

triggers reports under CERCLA If a

sub-stance is released in amounts exceeding its

RQ, the release must be reported to the

Na-tional Response Center, the SERC, and the

community emergency coordinators for areas

likely to be affected

reportable vehicle

All sedans, station wagons, ambulances,

buses, carryalls, trucks and truck tractors

Excluded are semitrailers, trailers, and other

trailing equipment such as pole trailers,

dol-lies, cable reels, trailer coaches and bodies,

portable wheeled compressors, trucks with

permanently mounted equipment (e.g

gen-erators, air compressors, etc.), fire trucks,

motorcycles, electric and hybrid powered

electric vehicles and military design motor

vehicles

reporting point

A geographical location in relation to which

the position of an aircraft is reported

reporting threshold

Rail Operations The level of railroad

prop-erty damage, resulting from a train accident

involving on-track equipment, over which a

railroad company must report the accident to

the Federal Railroad Administration

Report-able damages include the cost of labor and the

cost of repairing (or replacing in kind)

dam-aged on-track equipment, track, track

struc-ture, or roadbed

reporting unit

Any Coast Guard Command having its own

OPFAC (Operating Facility) code (and,

there-fore, an individual accountability)

repository

Under the Federal Nuclear Waste Policy Act

of 1982: Any system designed by the Nuclear

Regulatory Commission that is intended to be

used for, or may be used for, the permanent

deep geological disposal of high-level

radio-active waste and spent nuclear fuel, whether

or not such system is designed to permit the

recovery, for a limited period during initial

operation, of any materials placed in suchsystem Such term includes both surface andsubsurface areas at which high-level radioac-tive waste and spent nuclear fuel handling ac-tivities are conducted

repowering

According to the Clean Air Act: Rep lacement

of an exi sting coal-fired boiler with one of thefol lowing clean coal techno logies : atmo spheri c

or pressu rized fluidi zed bed comb ustion , teg rated gasifi cation combi ned cy cle, magneto -hyd rodynamics, direct and indirect coal -fired turbines, integ rated gasifi cation fuel cells, or as det ermined by the EPA Admin istrat or, in con sultat ion wi th the Secretary of Energy, aderivative of one or more of these tech-nologies, and any other technology capable ofcontrolling multiple combustion emissionssimultaneously with improved boiler or gen-eration efficiency and with significantlygreater waste reduction relative to theperformance of technology in widespreadcommercial use as of November 15, 1990

"forgetting" unpleasant situations as a way ofavoiding them

reproducibility

Instrumentation The precision of a single

measurement on the same sample made bydifferent operators, using different in struments

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The process by which a living entity or

organism produces a new individual of the

same kind

reproduction rate

The ratio of the total number of births from

women of reproductive age to the number of

women within that age group in the

population

reproductive toxicity

A harmful effect to the adult reproductive

system The ability of a substance or physical

agent to adversely affect the reproductive

system

reproductive toxin

A substance that has the capability to

adversely affect the adult reproductive

system

required evaporation rate

The amount of water from sweat or other

sources which must evaporate from the body

surface into the atmosphere per unit time to

maintain the body's heat balance

required sweat rate

The volume of sweat per unit time which

must be secreted to assure adequate body

cooling

requirements contract

A legal agreement for a supplier to provide

and for a buyer to purchase one or more types

of products or materials for a specified period

of time, usually at a specified price and

delivery terms

re-refined oil

Under the Federal Solid Waste Disposal Act:

Used oil from which the physical and

chemi-cal contaminants acquired through previous

use have been removed through a refining

process

reregistration

The reevaluation and relicensing of existing

pesticides originally registered prior to current

scientific and regulatory standards EPA

re-registers pesticides through its Registration

Standards Program

res judicata

Latin A legal doctrine, meaning "the thing is

decided," preventing new litigation by the

same parties on the same matter after it has

been fully adjudicated

rescissory damages

Such damages contemplate a return of theinjured party to the position he/she occupiedbefore he/she was induced by wrongful con-duct to enter into the transaction When re-turn of the specific right, property, etc is notpossible (e.g., in a stock fraud transaction, thestock is no longer available), the rescissorydamages would be the monetary equivalent(e.g., the value of the stock)

rescue coordination center (RCC)

A search and rescue (SAR) facility equippedand manned to coordinate and control SARoperations in an area designated by the SARplan The U.S Coast Guard and the U.S AirForce have responsibility for the operation ofRCCs

rescue doctrine

Under this doctrine, one who has, throughhis/her negligence, endangered the safety ofanother may be held liable for injuries sus-tained by a third person who attempts to savethe other from injury

of accepted theories or laws in the light ofnew facts

research and development (R & D)

The process of attempting to find new edge for commercial use in creating a newproduct or improving current products

knowl-Research and Special Programs tion (RSPA)

Administra-The Administration was established formally

on September 23, 1977 It is responsible forhazardous materials transportation and pipe-line safety, transportation emergency prepar-edness, safety training, multimodal transpor-tation research and development activities,and collection and dissemination of air carriereconomic data It includes the Office of Haz-ardous Materials Safety; the Office of Pipe-line Safety; the Office of Research Technol-ogy, and Analysis; the Office of UniversityResearch and Education; the Office of Auto-mated Tariffs; the Office of Research Policy

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and Technology Transfer; the Volpe National

Transportation Systems Center; and the

Transportation Safety Institute

reserve

That amount of energy, strength, heart rate, or

other quantity which is available to an

indi-vidual but which is not being used in the

cur-rent activity

reservoir

Any natural or artificial holding area used to

store, regulate, or control water

reset device

Rail Operations A device whereby the

brakes may be released after an automatic

train control brake application

residential district

The territory adjacent to and including a

highway which is not a business district and

for a distance of 300 feet or more along the

highway is primarily improved with

resi-dences

residential solid waste

The wastes generated by the normal activities

of households including, but not limited to,

food wastes, rubbish, ashes, and bulky wastes

Residential Transportation Energy

Consump-tion Survey (RTECS)

This survey was designed by the Energy

In-formation Administration of the Department

of Energy to provide information on how

en-ergy is used by households for personal

vehi-cles It has been conducted five times since

1979, the most recent being 1991

residential vehicle

Motorized vehicles used by U.S households

for personal transportation Excluded are

motorcycles, mopeds, large trucks, and buses

Included are automobiles, station wagons,

passenger vans, cargo vans, motor homes,

pickup trucks, and jeeps or similar vehicles

To be included, vehicles must be a) owned by

members of the household, or b) company

cars not owned by household members but

regularly available to household members for

their personal use and ordinarily kept at home,

or c) rented or leased for 1 month or more

residual

Amount of a pollutant remaining in the

envi-ronment after a natural or technological

proc-ess has taken place, e.g., the sludge remaining

after initial wastewater treatment, or lates remaining in air after the air passesthrough a scrubbing or process

residual fuel oils

(1) The topped crude of refinery operations,which includes No 5 and No 6 fuel oils, asdefined in ASTM Specification D 396 andFederal Specification, VV-F-815C; NavySpecial Fuel oil as defined in Military Speci-fication MIL-F-859E including Amendment 2(NATO symbol F-77); and Bunker C fuel oil.Residual fuel oil is used for the production ofelectric power, space heating, vessel bunker-ing, and various industrial purposes (2) Theheavier oils that remain after the distillate fueloils and lighter hydrocarbons are distilledaway in refinery operations and that conform

to American Society for Testing and Materials(ASTM) Specifications D396 and 975 In-cluded are No 5, a residual fuel oil of me-dium viscosity; Navy Special, for use insteam-powered vessels in government serviceand in shore power plants; and No 6, whichincludes Bunker C fuel oil and is used forcommercial and industrial heating, electricitygeneration, and to power ships Imports of re-sidual fuel oil include imported crude oilburned as fuel

residual hearing

That capability for hearing retained by an dividual with hearing loss

in-residual radioactive material

Under the Federal Uranium Mill Tailings diation Control Act of 1978: Waste (whichthe Secretary of Energy determines to be ra-dioactive) in the form of tailings resultingfrom the processing of ores for the extraction

Ra-of uranium and other valuable constituents Ra-ofthe ores and other radioactive waste at a proc-essing site which relates to such processing,including any residual stock of unprocessedores or low-grade materials

residual risk

That risk that remains after the application orimplementation of controls, barriers, or otherrisk-reducing methods or techniques

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residual strength

The maximum value of nominal stress that a

cracked body is capable of sustaining,

ne-glecting the area of the crack itself

residual stress

The stress that remains in a structure after

processing, fabrication, assembly, testing, or

operation (for example, welding-induced

re-sidual stress)

residual volume

The volume of air remaining in the lungs after

a maximal expiration Also called residual

air

residue

(1) With regard to solid wastes, all solids that

remain after completion of thermal

process-ing, including bottom ash, fly ash, and grate

siftings (2) The hazardous material

remain-ing in a packagremain-ing, includremain-ing a tank car, after

its contents have been unloaded to the

maxi-mum extent practicable and before the

pack-aging is either refilled or cleaned of hazardous

material and purged to remove any hazardous

vapors

residue rule

States that any residue left in empty

contain-ers will not be regulated under RCRA

pro-vided that all hazardous wastes are removed

from the container using the practice

com-monly employed to remove materials from

that type of container and that no more than

one inch of residue remains Also referred to

as the one inch rule.

resilience

The ratio of energy given up on a recovery

from deformation to the energy required to

produce the deformation in an elastic

struc-ture

resist-dyeing

A textile coloring technique in which a

sub-stance which prevents dyeing is applied to

certain threads before dyeing to produce

col-oring patterns

resistance

(1) Opposition of a conductor to passage of

electricity or other energy or substance See

also electrical resistance (2) The ability of

an organism to withstand a noxious influence

For plants and animals, the ability to

with-stand poor environmental conditions and/or

attacks by chemicals or disease The abilitymay be inborn or developed (3) In studies ofrespiration, an expression of the opposition toflow of air produced by the tissues of the airpassages, in terms of pressure per amount ofair per unit of time (4) In psychoanalysis,opposition to the coming into consciousness

of repressed material

resistance arm

That portion of a lever arm from the fulcrum

to the point at which the resistance is applied

resistance heating

The use of electrical resistance to provideheat, normally within a relatively confined orlocalized volume

resistance strain gauge

A transducer constructed of a material whichchanges electrical resistance under stress ordeformation

resistance thermometer

A device containing a sensing element whoseelectrical resistance varies as a known func-tion of temperature and thus can provide atemperature measurement

resolution

(1) Instrumentation The smallest change in

concentration of a contaminant that will duce a detectable change in instrument output

pro-(2) Electronics The number of horizontal

and vertical pixels which are available fordisplay on a screen at any given time

(1) General A phenomenon in which an

ex-ternally forced oscillation imposed on aphysical-mechanical system causes a maximaloscillatory response amplitude in that system

(2) Acoustics Exists when any changes,

however small, in the frequency of excitation

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