liquid ring vacuum pumps pdf

... sizes 6.4 Laboratory or Aspirator Vacuum System Sufficient capacity to maintain a minimum vacuum of approximately 13 cm (5 in.) of mercury for cartridges Agreater vacuum (66 cm [26 in.] of mercury) ... cartridge and into a syringe needle which isinserted through a rubber stopper into the suction flask A slight vacuum of approximately 13 cm (5 in.) of mercury is used during all operationswith ... performance withexternally prepared test materials 4.0 INTERFERENCES 4.1 During analysis, major contaminant sources are reagents and liquid- solid extraction devices Analyses of field and laboratory reagent

Ngày tải lên: 22/03/2014, 14:20

... Trang 1Multidrug efflux pumps: drug binding – gates or cavity? Emily Crowley and Richard Callaghan Nuffield Department of ... binding per se or the hydrolytic step is responsi-ble for switching the binding site orientation during Keywords central cavity; coupling; domain interface; drug binding; drug resistance; drug transport; ... presented in Table 1 This not an exhaustive list, but does highlight many significant observations during the past two decades Initial attempts made use of photo-active versions of ABCB1 inhibitors

Ngày tải lên: 22/03/2014, 21:20

... High-pressure HPLC, 112; see also U-HPLC High-pressure liquid chromatography, 8 High-priced liquid chromatography; see U-HPLC High-speed liquid chromatography, 8 HILIC, see Hydrophilic interaction ... detectors; see Detectors, MS Trang 8Multi-angle light-scattering detectors(MALS); see Detectors, light-scattering Multidimensional liquid chromatography, 616–618; see also Two-dimensional chromatography ... resolution map, 476–477 robustness, 496–497 Condensation nucleation light-scattering detectors; see Detectors, light-scattering Conditional peak capacity; see Equivalent peak capacity Conductivity

Ngày tải lên: 04/07/2014, 01:20

... Operations, 887 II.2 Recipes for Some Commonly Used Buffers, 888 Reference, 890 Trang 4High-performance liquid chromatography (HPLC)is today the premier technique for chemical analysis and related applications, ... trouble-free operation Prior to 1990, HPLC method development was an uncertain process—often requiring several months for the acceptable separation of a sample xxxi Trang 5xxxii PREFACESince then ... chromatography (NPC) is given in Chapter 8, including special attention to hydrophilic interaction liquid chromatog-raphy (HILIC) In Chapter 7 the separation of ionized or ionizable samples is treated,

Ngày tải lên: 04/07/2014, 01:20

... piston spring piston Figure3.12 Check-valve designs (a) Simple ball and seat; (b, c) active check valves. pump head Ceramic check valves may be used in some pumps, and sometimes a small spring is ... Figure 3.11, most pumps have a purge valve on the outlet side of the pump that directs the pump output to waste during pump priming, solvent changeover, and bubble removal Many pumps also have ... smooth, requiring little, if any additional pulse dampening Dual-piston pumps are one of the two most widely used pump designs for analytical HPLC today 3.5.1.2 Accumulator-Piston Pumps An alternative

Ngày tải lên: 04/07/2014, 01:20

... in the fitting when it is tightened under pressure, so the pump should be turned off during this operation. Pumps. Sticky or leaky check valves are the most common pump problem in most systems. ... three-ring binder with sections for different maintenance activities and records. A separate binder is kept with each HPLC system where it can be referenced easily and is most likely to be used during ... the column as a check of the oven temperature and temperature equilibration within the column. During system startup each day or when a new method is started, the column endfittings should be checked

Ngày tải lên: 04/07/2014, 01:20

... shaded peak 20 corresponds approximately to toluene, which provides a reference point for comparing these two separations Compounds 1 to 6 are unretained by RPC (because of their greater polarity), ... [79] with base silica as column packing This can result in complete retention of the B-solvent during the early part of the gradient, followed by a sudden breakthrough of B-solvent in the column ... differences in the detector response for the A- and B-solvent As a result the baseline can drift during the gradient Baseline drift is common in RPC with UV detection because organic solvents (the

Ngày tải lên: 04/07/2014, 01:20

... NEMA 4X/7/9 Figure 5 Wiring diagram for DPDT Series B, C, D, F, R, 8 & 9 switches Trang 75 The switch terminals are located next to the conduit outletto facilitate wiring Bring supply wires through ... leads to the control wiring. open-6 Dress wiring to ensure no interference or contact with theswitch housing cover OBSERVE ALL APPLICABLE ELECTRICAL CODESAND PROPER WIRING PROCEDURES Prevent ... Refer toFigure 4onpage 6 15 Bring supply wires through conduit outlet Follow steps 5 through 10 in Wiring, Section 2.5 on pages 6 and 7. 16 Test switch action by varying liquid level in float chamber

Ngày tải lên: 31/07/2014, 23:21

... the coastal area. The climatic conditions during previous winter were as im- portant to earlywood and tree-ring formation as the climate during late spring of current year. In turn, latewood was ... tree-ring boundaries and individual tracheids were clearly visible under magnification. Trees having less than 40 rings were re- jected. Trees with at least one core showing wounds and/or missing rings ... tree rings on all cores were cross-dated by using both the list method [63] and the skeleton plots [54] to ensure that each ring was dated to the correct calendar year of formation. Tree-ring

Ngày tải lên: 07/08/2014, 16:20

... CHAPTER ELEVEN Ring Antennas and Frequency- Selective Surfaces 297 Microwave Ring Circuits and Related Structures, Second Edition, by Kai Chang ... Copyright © 2004 John Wiley & Sons, Inc. 11.1 INTRODUCTION The ring antenna has been used in many wireless systems. The ring resonator is constructed as a resonant antenna by increasing the ... shown in Figure 11.1, a coaxial feed with the center conductor extended to the ring can be used to feed the antenna. The ring antenna has been rigorously analyzed using Galerkin’s method [5, 6]. It

Ngày tải lên: 08/08/2014, 01:21

... and thinning on ring width and ring sity and (ii) to establish the relation ring width – ring den-sity and test if there were additional effects of fertilisation and thinning on ring density Radial ... pro-cessed in a software program to determine annual ring characteristics [14] For each annual ring, year of ring formation, ring position (mm from bark), ring width ) were calculated Density values from ... Calculation and statistics For each growth ring, mean values of ring width and ring density from two opposing radii were calculated Treatment effects in ring width and ring density were cal-culated as

Ngày tải lên: 08/08/2014, 14:20

... corrosion is indicated by material softening, discoloration, charring, embrittlement, stress cracking (also referred to as crazing), blistering, swelling, dissolving, and other effects. Corrosion of ... Paragraph 3-3b. This procedure is not directly applicable concentration of chemicals in the liquid, liquid to thermoplastic pipe fittings, particularly in cyclic temperature, duration of contact, ... one of the basic principles of designing and for liquid process piping systems, the advantages and specifying thermoplastic piping systems for liquid disadvantages of each method are evaluated

Ngày tải lên: 12/08/2014, 16:20

... Understand Centrifugal Pumps 3 Vaporizing Liquids Certain liquids vaporize with heat (think of steam), and other liquids vaporize with a drop in pressure (think of liquid propane or freon) ... a basic plumbers O-ring seal, and handles most household liquids and chemicals. Because industry pumps so much water, this elastomer may be the single most popular O-ring secondary seal ... Centrifugal Pumps The pump shaft must be free to slide through the O-ring. However, crystallizing liquids, accumulated solids and pastes, and products that harden can cause the O-ring to

Ngày tải lên: 13/08/2014, 09:21

... Engineering Department, Arizona State University, Tempe, Arizona, USA. 3 Civil and Environmental Engineering Department, Arizona State University, Tempe, Arizona, USA. 4 School of Engineering and ... imaged, the water vapor was pumped away Because the surface tension between the liquid layer and the substrate drew the liquid away from the solid core of the particle (see Figure 4, image i), it ... CU Commons: http://commons.cu-portland.edu/msfacultyresearch/61 Trang 3Hygroscopic behavior and liquid-layer composition of aerosol particlesgenerated from natural and artificial seawater Matthew

Ngày tải lên: 25/03/2023, 21:53

... “Robotic vacuum cleaner” Wikipedia.org, Wikipedia, Robotic vacuum cleaner - [7] “A Brief History of the Robot Vacuum Cleaner” – Vacuum Wars (2023), A Brief History of the Robot Vacuum Cleaner - Vacuum ... Roomba 2002 Prototype Vacuuming Robot Roomba quickly became a phenomenon and opened up a large market for vacuuming robots During this period, recognizing the potential of the vacuuming robot market, ... is still one of the leading manufacturers of vacuum cleaners and cleaning tools in the US By 1996, the first intelligent vacuum cleaner - robotic vacuum cleaner was launched Trilobite was the

Ngày tải lên: 01/10/2024, 10:19

... PROTECTIVE RING CONTAINING AN Trang 2TRUYỀN THÔNG VIỆT HÀNKHOA KINH TẾ SỐ VÀ THƯƠNG MẠI ĐIỆN TỬBÁO CÁO ĐỒ ÁN MÔN HỌC KHỞI NGHIỆP VÀ ĐỔI MỚI SÁNG TẠO VÒNG BẢO VỆ CHỨA TÚI KHÍ- PROTECTIVE RING CONTAINING ... sản phẩm: 89.2% 6 Trang 10CHƯƠNG 1: GIỚI THIỆU DỰ ÁN“VÒNG BẢO VỆ CHỨA TÚI KHÍ PRCAA-PROTECTIVE RING CONTAINING AN AIRBAG”  Lĩnh vực kinh doanh: Thiết bị công nghệ  Địa điểm kinh doanh: cửa

Ngày tải lên: 19/12/2024, 14:50

... WIDEBAND CDMA STANDARD FOR THE UTRA FDD AIR INTERFACE by Nicky Jee-Ngai Yuen Electrical Engineering 563 Wireless Personal Telecommunications Systems Trang 2ETSI WIDEBAND CDMA STANDARD FOR THE ... earlier cellular systems, combined with fast power control on the downlink, hierarchical cell structuring, and adaptive antenna arrays all improve performance and reduce receiver threshold, especially ... cellular system can provide high system capacity through the microcell layer, at the same time offering full coverage and support of high mobility by the macrolayer [9] Interfrequency handover is

Ngày tải lên: 04/08/2012, 14:24

... following to the drive: • The line supply, ensuring that it is: - compatible with the voltage range of the drive - switched off • The motor, ensuring that its coupling corresponds to the line ... drive - Setting: Can be changed during operation or when stopped - Configuration: Can only be modified when stopped and no braking is taking place Can be displayed during operation Start up Important: ... be accessed in a number of menus for increased user-friendliness: - Entering settings - Return to factory settings - Restoring and saving the configuration A dash appears after menu and sub-menu

Ngày tải lên: 04/08/2012, 14:25

... lại là chữ thường REPLACE(char,search_string[,replacement_string]) : thay tất cả các chuỗi search_string có trong chuỗi char bằng chuỗi replacement_string RPAD(char1, n [,char2]) Giống LPAD(char1, ... FLARK MANAGER MINIGET MILLER MILLER CLERK CLETK VÝ dô hµm REPLACE(char,search_string[,replacement_string]) SELECT JOB, REPLACE(JOB, ‘SALESMAN’, ‘SALESPERSON’), ENAME, REPLACE(ENAME, ‘CO’,’PR’) ... thực Cú pháp của hàm NVL NVL (DATECOLUMN,’01-01-2001’) NVL(NUMBERCOLUMN, 9) NVL(CHARCOLUMN,’STRING’) Ví dụ: NVL(comm,0) trả về trị 0 khi comm là null SELECT ename, sal*12 + NVL(comm,0) ANUAL_SAL

Ngày tải lên: 06/08/2012, 15:21