... the center of the world, and the source of heat, light, and life [5] In the ancient manuscript of ‘Brhad-Devata’, it is cited [3] Of what is and has been and is to be, and what moves or remains ... source of light and life but also as the center of power and justice The Toltec in their city of Teotihuacan dedicated the sun pyramid to the sun In Egypt, it was Amun-Ra and Aten, the creator of ... as it does, sets up processes of change and becoming and decay and by its agency the finest and sweetest water is every day carried out and is dissolved into vapor and rises to the upper region,
Ngày tải lên: 30/12/2017, 17:18
... buildings The time lag of the heat gains Trang 114000.4 Concrete Softwood Concrete Softwood 0.2 Concrete Softwood Concrete Softwood The time delay in the transmission of a heat wave through ... principal categories of building solar heating and cooling systems: passive and active Passive systems integrate into the structure of the building technologies that admit, absorb, store, and release ... transient responses of buildings, and developing simplified analytical thermal models of direct-gain rooms Next, methods are presented for the thermal analysis of hybrid PV/T collectors and building-integrated
Ngày tải lên: 30/12/2017, 17:24
THEORY AND APPLICATIONS OF MONTE CARLO SIMULATIONS ppt
... structure of an umbrella to define and exemplify theposition of this book within the fields of science and engineering Imagine that one can placeMCS at the centerpoint of an umbrella and define ... since it does not apply to values of x∉ [0; 1] The latter has the lowest values of (3) and (4), and the highest of (5) and (6), i.e. it is the worst fit The types of distributions worth using are ... indication of the median and the interquartile range (in brackets) of the fitted theoretical distributions In the presence of RBC the parameters of the fitted distributions of the eptifiba‐ tide-free and
Ngày tải lên: 16/03/2014, 12:20
principles and applications of tensor analysis - m. smith
... insight to the understanding 0 e fundamen laws of physics and engineering This text, usi ical les tÌ hout, s atically explains and demonstrates basic tensor theory and its applications The book ... classical mechanics, and the theory of elasticity, have evolved Therefore, the ability to understand and apply tensors is a definite advantage to engineers, physicists, and applied math- f ... numerous important applications in the gen- of elasticity The fourth chapter presents the application of tensor analysis to some of the most important concepts in classical and relativistic mecnanics
Ngày tải lên: 31/03/2014, 15:22
Principles and Applications of Electrical Engineering P21
... portion of this chapter to the study of AC machines and of induction motors in particular The objective of this section is to explain the basic operation of both synchronous and induction machines and ... the currents of Figure 19.26, the speed of rotation of the flux must be related to the frequency of the sinusoidal phase currents In the case of the stator of Figure 19.25, the number of magnetic ... power) and the speed of rotation of the prime mover In the latter respect, there is a significant difference, for example, between the speed of rotation of a steam turbine generator and that of a
Ngày tải lên: 08/04/2014, 23:03
Principles and Applications of Electrical Engineering P3
... that knowledge of the mesh currents permits determination of all the other voltages and currents in the circuit Examples 3.7, 3.8 and 3.9 further illustrate some of the details of this method ... behavior of a circuit containing multiple sources The principle of superposition applies to any linear system and for a linear circuit may be stated as follows: sum of N voltages and currents, each of ... itself, and therefore this procedure is equivalent to “zeroing” the output of one of the voltage sources If, on the other hand, we wished to cancel the effects of a current source, it would stand
Ngày tải lên: 08/04/2014, 23:05
Principles and Applications of Electrical Engineering P4
... C is called the capacitance of the element and is a measure of the ability of the device to accumulate, or store, charge The unit of capacitance is coulomb per volt and is called the farad (F) ... A is the area of each of the plates, and d is their separation The permittivity of air is ¢9 = 8.854 x 10-1 F/m, so that two parallel plates of area 1 m?, separated by a distance of 1 mm, would ... be made up of two fixed surfaces (typically, spherical depressions ground into glass disks and coated with a conducting material) and of a deflecting plate (typically made of steel) sandwiched
Ngày tải lên: 08/04/2014, 23:06
Principles and Applications of Electrical Engineering P9
... industrial applications are often served directly by three-phase power Understand the basic principles of residential electrical wiring, of electrical safety, and of the generation and distribution of ... understanding of the fundamental properties of practical operational amplifiers A number of useful applications are introduced in the examples and homework problems 409 Trang 183 Analyze and design ... delivered to the same motor in the wye and delta of each of the sources is 60 Hz connections. Trang 14 @ | Rizzoni: Principles and I Circuits 7 AC Power Applications of Electrical Engineering, Fifth
Ngày tải lên: 08/04/2014, 23:09
synthesis and applications of nanostructured iron oxides hydroxides a review
... stage of the synthesis Control of the size and shape of the particles can be obtained through the use of various distinct protein cages in an expanding library of structures (Douglas and Young,1998; ... magnetic mapping of organs, as magnetic carriers for identification and isolation of blood cells and antibodies and for transportation of drugs to the places of diseases (Reimer and Weissleder, ... five polymorphs of FeOOH and four of Fe2O3 Characteristics of these oxide compounds include mostly the trivalent state of the iron, low solubility and brilliant colors (Cornell and Schwertmann,
Ngày tải lên: 28/05/2014, 14:52
principles and applications of nanomems physics, 2005, p.264
... effects and mixed domain Principles and Applications of NanoMEMS Physics contains five chapters Chapter 1 provides a comprehensive presentation of the fundamentals and limitations of nanotechnology ... upon the operations of forming precise patterns of metallization and doping (the controlled introduction of atomic impurities) onto and within the surface and bulk regions of a semiconductor wafer, ... courses emphasizing physics and applications of nanotechnology, and to Nanotechnology researchers engaged in analyzing, modeling, and designing NanoMEMS-based devices, circuits and systems Trang 14xv
Ngày tải lên: 04/06/2014, 15:17
Properties and Applications of Silicon Carbide Part 1 pdf
... by Use of Nickel and Tantalum from a Materials Science Point of View 171 Yu Cao and Lars Nyborg Other applications: Electrical, Structural and Biomedical 195 Properties and Applications of Ceramic ... Institute of Technology Atlanta, USA Trang 11Thin Films and Electromagnetic ApplicationsPart 1 Thin Films and Electromagnetic Applications Trang 13Identification and Kinetic Properties of the Photosensitive ... for Diffusion and Segregation of Boron and for Ion Implantation of Aluminum in 4H-Silicon Carbide 29 Yasuto Hijikata Hiroyuki Yaguchi and Sadafumi Yoshida Magnetic Properties of Transition-Metal-Doped
Ngày tải lên: 20/06/2014, 04:20
Properties and Applications of Silicon Carbide Part 2 pptx
... instant of time. The value of the first derivative was calculated as the right-hand side of rate equations (3), and that of the second derivative, as the derivative of the right- hand side of Eqs. ... instant of time. The value of the first derivative was calculated as the right-hand side of rate equations (3), and that of the second derivative, as the derivative of the right- hand side of Eqs. ... 2) , (18) where f1 and f2 are, respectively, normalized Pearson IV distribution functions for the randomly scattered and channeled components of the profile, and D1 and D2 are the doses
Ngày tải lên: 20/06/2014, 04:20
Properties and Applications of Silicon Carbide Part 3 doc
... involves first Step (A) and then the repetition of Steps (B) and (C) Figure 4 is the process for low temperature deposition and evaluation of the film, consisting of Steps (A), (D) and (E) Step (D) ... involves first Step (A) and then the repetition of Steps (B) and (C) Figure 4 is the process for low temperature deposition and evaluation of the film, consisting of Steps (A), (D) and (E) Step (D) ... N (2011b) Two-dimensional analytical model for concentration profiles of aluminium implanted into 4H-SiC (0001) To be published in IEEE Transactions on Electron Devices, Vol 58, (2011), 0018-9383
Ngày tải lên: 20/06/2014, 04:20
Properties and Applications of Silicon Carbide Part 4 pot
... B, C, and L, and that the values of B/A, C, and L, and the temperature de- pendences of C and L for Si-face are different from those for C-face Finally, we have discussed the mechanism of the ... B, C, and L, and that the values of B/A, C, and L, and the temperature de- pendences of C and L for Si-face are different from those for C-face Finally, we have discussed the mechanism of the ... with the cases of SiC C-face and Si, which may cause the characteristics of the SiCSi-face oxidation to differ from those for SiC C-face and Si Trang 4Properties and Applications of Silicon Carbide843.5
Ngày tải lên: 20/06/2014, 04:20
Properties and Applications of Silicon Carbide Part 5 docx
... by a sum of integrals over the segments j=1…n The expressions of all electric field components for the area S+ and S are presented below: Trang 10The field components and the values of the functions ... characteristics of main and higher modes in regular waveguides of arbitrary cross–section geometry containing piecewise homogeneous materials as well as the distribution of the EM field inside and outside of ... unit (i2=-1) Because of the equations linearity the general solution is a sum of solutions when jh 0, je 0 and jh 0, and je 0 The transversal components Ex, Ey, Hx, Hy of the EM field are
Ngày tải lên: 20/06/2014, 04:20
Properties and Applications of Silicon Carbide Part 6 ppt
... characterization of chemical and biological agents and materials, remote and standoff early-warning for chemical-biological warfare threats, and imaging of concealed weapons and explosives, just ... potential payoffs of THz sensing and imaging for an array of military, security and industrial applications These applications include the spectroscopic-based detection identification and characterization ... global demand for THz-frequency applications and this warrants a new class of IMPATT oscillators which would outclass conventional Si and GaAs IMPATTs Investigations on the prospects of Wide Bandgap
Ngày tải lên: 20/06/2014, 04:20
Properties and Applications of Silicon Carbide Part 7 potx
... formation of alternating Ni-silicide and C layers The systems which show the tendency of the formation of periodic bands have relatively large parabolic rate constant k and k0 values (intercept of the ... formation of alternating Ni-silicide and C layers The systems which show the tendency of the formation of periodic bands have relatively large parabolic rate constant k and k0 values (intercept of the ... silicides and controls the rate of Ni2Si formation in the second reaction stage As a result of fast dissociation of SiC and enhanced diffusion of Ni, Ni2Si is formed quicker under the action of argon
Ngày tải lên: 20/06/2014, 04:20
Properties and Applications of Silicon Carbide Part 8 potx
... made by extrusion and sintering were reported to withstand shocks of almost 500C and lost only 12% of strength after 400 shocks of 230C Strength slowly decreased with cycling and did not plateau ... made by extrusion and sintering were reported to withstand shocks of almost 500C and lost only 12% of strength after 400 shocks of 230C Strength slowly decreased with cycling and did not plateau ... whisker defects Many of these will be considered in this section, and a discussion of interface effects and SiCw defects is given in Section 3.8 Properties of the Al2O3 and sintering additives
Ngày tải lên: 20/06/2014, 04:20
Properties and Applications of Silicon Carbide Part 9 pptx
... production of dense materials by mean of pressure assisted sintering, and to investigate the influence of a variety of additives, including carbon and silicon carbide, on the processing and oxidation ... production of dense materials by mean of pressure assisted sintering, and to investigate the influence of a variety of additives, including carbon and silicon carbide, on the processing and oxidation ... pressure of 4 and PROMES-200 Pa 4.2 Emissivity values of C/SiC samples Emissivity values of C/SiC composites obtained in the temperature range 1000-1800 K and at 4 and 200 Pa are listed in Table 1 and
Ngày tải lên: 20/06/2014, 04:20
Properties and Applications of Silicon Carbide Part 10 pot
... arrester of manufacturer A Fig 5 Surge arrester of manufacturer C magnets Blocks of SiC gap electrodes and nonlinear resistors Blocks of SiC Group of gap electrodes Blocks of SiC Trang 8Fig 6 Group of ... Surge arrester of manufacturer A Fig 5 Surge arrester of manufacturer C magnets Blocks of SiC gap electrodes and nonlinear resistors Blocks of SiC Group of gap electrodes Blocks of SiC Trang 7 ... leakage current amplitude of 0.726 mA, distortion of 18 % and phase difference of 510, which may indicate some degradation of its internal components; surge arresters C5 and C6 had high RIV values,
Ngày tải lên: 20/06/2014, 04:20