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Online since: November 2013
Authors: Jacek Eliasz, Olexiy A. Balitskii, Sergiy A. Gryshchenko, Natalia M. Polishchuk
Experimental Procedure We carried out standard mechanical tensile tests and X-ray analysis using the well-known procedures [2, 3] since strength is one of the main factors determining the serviceability of modern devices of semiconductor electronics, in particular, photodetectors and solar cells (both active elements and optical windows can be constructed from III-VI materials) [7-12].
It is necessary to identify and remove defects caused by scratches in the course of production, polishing, and grinding in order to exclude damages affecting the quality of semiconductor photodetectors and solar energy devices.
Liquid neutral, acid environments as films (or drops), which are formed on the spot of these electrodes has influenced on the surface characteristics of the investigated semiconductors, thus study of structure changing on nanoscale and electrochemical properties are necessary for finding out of principle of action of new photoelectrochemical units for transformation of sun energy [13].
Mechanical properties of gallium and indium selenides in initial state (upper values) and hydrogenated (down).
Faber: The mechanical properties of semiconductors (Academic Press, San Diego 1992)
Online since: January 2013
Authors: Jenn Yih Chen
The passive properties of the flux observer, rotor resistance estimator, and composite adaptive position controller were analyzed based on the passivity theorem.
According to the properties, the overall position control system was proved to be globally stable without using Lyapunov-type arguments.
The variation of the rotor resistance or unknown external disturbances will affect accuracy of stator current components and output responses.
represents the forgetting factor which is a positive constant.
The passive properties of the negative feedback connection of the rotor flux observer to the rotor resistance estimator, and the composite adaptive controller were proved.
Online since: November 2012
Authors: Ching I Chen, Yu Zhen Liu, Jian Wei Chen
The mechanical property of SAC leadless solder included time independent plastic and time dependent creep behaviors.
This will create large stresses and strains that induce cracking or delamination between interfaces, which affect mechanical reliability.
The other material properties used in the simulation are tabulated in Tab 2.
Experiment #1 is to be conducted at Level 1 for each of the seven control factors.
Factors and levelsa and summary of factor TABLE 4.
Online since: October 2012
Authors: Jiang Yuan Hou, Li Ke, Zhen Yu Xia
In addition, the living tissue, cells, growth factors or drugs may also be the introduction of the composite, which can be improved its biological properties, expanding its functionality greatly.
Composite materials have better properties and a wider range of applications due to the advantages of the selection of raw materials to avoid its disadvantages.
Someone get the polylactide a B glycoside (PLGA) polymer scaffolds for tissue engineering through the method of low heat and pressure, and that adding calcium alginate can improve the scaffolds hydrophilicity and mechanical strength; Lin Angela S P etc. study the microstructure and mechanical properties of porous PLA scaffold.
Thomson produced PLGA/HA porous scaffold material, and to study the factors affecting material properties.
Baker Abu Ms produce the polyether ether ketene HA enhanced mechanical properties of materials, and studied the mechanical properties of materials, heat treatment conditions on the material properties.
Online since: September 2013
Authors: Tuo Li, Hong Bai Bai, Chun Hong Lu
Mechanical properties of knitted-dapped metal rubber are influenced by many factors, such as wires’ material and diameters, sample’s thickness and density, grooves’ depth and width, and the netting mode.
The testing machine is applicable to tests of mechanical properties for both metal and non-metal material.
In order to insure the stability of mechanical properties, test-pieces were all repeated loading and unloading for 50 times before tests.
Stiffness and damping and the performances of knitted-dapped metal rubber are hardly affected by frequency.
(3) Stiffness and damping of knitted-dapped metal rubber are almost not affected by frequency
Online since: July 2012
Authors: M. Gherib, A. Otmani, A. Djekoun, A. Bouasla, M. Poulain, M. Legouira
Introduction The nanocrystalline materials, defined as polycrystalline solids having crystallite sizes usually less than 100 nm, can exhibit unique properties due to the large fraction of grain boundaries that they possess.
In particular, the strength, ductility and diffusion kinetics, among other mechanical and chemical properties, may be significantly enhanced for nanocrystalline materials in comparison with materials with conventional grain sizes [1-4].
These properties have made NiAl a suitable material for structural application such as gas turbine engine rotor blades and stator vanes.
Significant efforts have centred on enhancing the mechanical properties of intermetallics through grain refinement [7, 8].
Ihkl is computed as a function of some structural and geometrical parameters: (2) S is the scale factor, Fhkl is the structure factor inclusive of the Debye-Waller factor and site occupancy, mhkl is the multiplicity of the hkl reflection, Lp is the usual Lorentz-polarization factor, and Vc is the volume cell.
Online since: May 2012
Authors: M.S. Awan, M. Farooque, Shakeel Akbar, Z. Ahmad, M.N. Sarwar
Fe-Cr-Co magnetically hard alloys possess good magnetic properties in combination with high mechanical characteristics.
Using its additional mechanical properties along with magnetic properties components having complicated shape can be made.
This is one of the factors which play a prime role in the magnetic properties of Fe-Cr-Co alloys.
Effect of the spinodal decomposition temperature on the magnetic properties of the (a) alloy ‘A’ and (b) alloy ‘B’ The second major factor which affects the magnetic properties of material is difference in lattice parameter between spinodal phases, caused by the exchange of elements with different atomic volume.
This causes lattice parameter difference between α1 and α2 phase for respective alloy, thus affecting the morphology of the precipitated phases [1,5,6,12].
Online since: July 2014
Authors: Lei Zeng, Yuan Yuan Wu, Zhen Kun Cui, Qian Qian Gong
To study Steel reinforced concrete frame-reinforced concrete core wall (SRC frame-RC core wall) hybrid structure earthquake damage evolution and collapse mechanism, this paper holds the earthquake collapse mechanism, seismic collapse analysis and collapse control strategies as the mainline, establishes performance degradation and collapse criterion characterization based on structure dynamic characteristics, adopts incremental dynamic analysis (IDA) method to complete the prototype structure collapse-resistant test and quantitative assessment of seismic collapse analysis and determine the main factors that affect the structure collapse-resistant properties.
Under rare earthquake, plastic hinges mainly appear on the concrete core wall, the plastic hinge mechanism is unfavorable to seismic, once the core wall occurs large deformation and serious damage, the outer frame will cause instability or partial collapse of the entire structure. 2) Current research on the hybrid structure most contrary to a particular practical engineering structures, the existing research does not clearly reflect the collapse mechanism of such structures under earthquake, can not accurately assess the influence of various factors for collapse-resistant properties of such structure.
Apply IDA method based on nonlinear dynamic time history analysis, by introducing material dynamic damage constitutive, considering initial damage and damage evolution in the analysis process, to find out the SRC frame-RC core wall properties and response under different earthquake intensity.
Through statistical analysis of structural response-seismic strength parametric curves and combining with structural collapse criterion, to determine the critical earthquake standards. 5) Analysis of SRC frame- RC core wall hybrid structure collapse-resistant factors and collapse control.
[9] ATC-63 Quantification of building seismic performance factors[S].
Online since: February 2011
Authors: Dong Chen, Ming Yang Zhao, Tian Xu Zhu, Mei Ling Jiang
TWB are defined as two or more steel sheets with same or different thicknesses, mechanical properties or surface coatings welded together by laser before stamping [4].
Vertical pressing mode(Fig.3) has advantage of good mechanical properties, But in order to avoid the space of welding unit, the leveling rollers will be made into little structure(Fig.3a) or hollow structure(Fig.3b), which is difficult to manufacture.
The mechanical properties of inclined pressing mode(Fig.4) is poor, but its structure is simple, so this mode is a good choice to automatic laser welding production line with integrated welding unit.
Factors influencing leveling force are shown in fig.5.
Fig.5 Factors influencing the leveling force Fig.6 Force analysis of blanks The force analysis of leveling mechanism is shown in Fig.6, according to the force equilibrium conditions, (1) Where = leveling force (N) = friction between blanks (N) = flexibility torque (N) = pressure (N) = pressing position (m) = suspension length (m) leveling force can be estimated by Eq. 1.
Online since: February 2013
Authors: De Ren Kong, Li Ping Li, Fang Wang, Li Xia Yang, Chuan Rong Zhao
At the same time assess the accuracy of the pressure measuring, requites the relative errors between vice standard and standard crusher gauge is better than that between the testing-level and standard crusher gauge, also it requires the relative errors between the testing-level and standard crusher gauge is better than the relative errors between the working-level and standard crusher gauge[4]. 2 Analysis of Factors Influencing the Measuring Uncertainty of Standard Internal Crusher Gauge The factors that affect the measuring uncertainty of standard internal crusher gauge can mainly be divided into three categories: inconsistency of pressure’s true value from pressure source, the uncertainty imported by standard copper-cylinder and the random fluctuations of the individual character of crusher gauge. 2.1 The measuring uncertainty by the pressure source of pressure true value inconsistency The factors affect the true value of pressure’s inconsistencies include the dispersion of the pressure
values provided by the pressure environment simulators or standard gun under the conditions of the "standard" charge structure as well as heterogeneity of the same end face. 2.2 The measuring uncertainty introduced by standard copper-cylinder The factors that cause the measuring uncertainty by standard copper-cylinder can mainly be divided into five categories: the factors that affect pressure measuring uncertainty of standard copper-cylinder can be divided into as following categories: firstly, primary pressure standard; secondly, height measuring of copper-cylinder; thirdly, inconsistent individual deformation of standard copper-cylinder; fourthly, inconsistent pressure sensitivity; fifthly, the influence of temperature . 2.3 The measuring uncertainty introduced by the random fluctuations of the individual character of crusher gauge The random fluctuations of the individual character of crusher gauge are important factors that describe repeatability of the standard crusher gauge.
The facts than affect measuring uncertainty for crusher gauge are complex, including: (1) Uncertainty component introduced by overall mechanical properties of crusher gauge, Including: piston rod, processing geometry of cylinder, matching performance between piston rod and cylinder, and hardness of them; (2) The influence of pressure oil.
(2)The factors that affect the uncertainty of height measuring uncertainty of copper-cylinder are: the accuracy or the measuring uncertainty of height measuring, measuring uncertainty of the operators, measuring uncertainty introduced by the unevenness on two end face of copper-cylinder, Influence of the time of height measuring, donates:
According to selection method of standard internal crusher gauge, in-depth analysis the factors that affect the measuring uncertainty of standard internal crusher gauge which can mainly be divided into three categories: inconsistency of pressure’s true value from pressure source, the uncertainty imported by standard copper-cylinder and the random fluctuations of the individual character of pressure measuring gauge.
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