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Online since: October 2015
Authors: Terezie Vondrackova, Vera Vostova, Karel Jerabek
In the course of using the construction work, due to a number of factors there is an occurrence of defects, degradation processes, a decrease or even a loss of functionality and a gradual reduction of technical lifetime, eventually leading to the demise of the construction as a result of reaching a certain limit state.
The aim of this examination is to collect the up-to-date detailed data on the construction work.
In the period of using the construction works, there may, for various reasons, occur damages or malfunctions, i.e. a reduction or a complete loss of functioning of parts of constructions or even the whole constructions.
Online since: August 2007
Authors: Takashi Yokoyama, Kenji Nakai
The AA 7075-T651 base material exhibits almost no strain rate sensitivity up to a strain rate of about 103/s, which is quite consistent with the compression test data on AA 7075-T6 by Holt et al. [9].
Note that there is a 15 to 28% reduction in the compressive flow stress of the base material, independent of strain rates.
The reason for the reduction in the flow stress level is that the FS welding process redissolves the strengthening precipitates in the weld nugget region [1].
Online since: August 2017
Authors: M. Balasubramaniam, S. Balakumar
Comparing, the pattern of ZnSb2O6 with standard data wherein all the planes were at the same 2θ position except the major dominant peak (110) which had a small shift towards higher angles.
In comparison, the reduction potential changes dramatically while increasing scan rates in the absence of nafion while in its presence the CV curves are electrochemically stable even at higher scan rates that proves the fact that nafion acts as a good binding agent that holds the nanomaterial from decomposition into the electrolyte both mechanically and electrochemically.
Even at same scan rate in the absence of nafion the reduction potential trend is not similar there is huge difference between each cycles (indicated by double ended red arrows) which also proves that the charge transfer process is not complete and also the known fact is that nafion serves as a bridge for complete charge transfer process between electrode and electrolyte that is the case shown in Fig. 2 (d).
Online since: March 2013
Authors: Ying Wang, Qing He Zhang, Jun Tao Zou
First, the Cu2+ concentration in the bath increased, promoting the oxidation-reduction reaction forward; on the other hand, the excessive salt reduced the complexing agent molar ratio, reducing the stability of the electroless plating solution, electroless more difficult.
The result of data fitting indicated that its slope was 0.401, so corresponding kinetic parameters α was 0.401Compared to the actual deposition rate and the theoretical deposition rate under the conditions of the different levels of orthogonal experiment.
Kim, Hydrogen-reduction behavior and microstructural characteristics of WO-CuO powder mixtures with various milling time, J.
Online since: October 2010
Authors: Marcello Filgueira, R.S. Guimarães, H.C.P. Oliveira, Stenio Cavalier Cabral
One of those reactions that should happen is adherence between the surface of the diamond and the metallic matrix that it surrounds, so that happens will depend on some factors as: composition of the metallic powders, size and distribution of the same ones, existence of the oxidation and reduction of gases, duration of the process and thermal processes [6].
It is also the increment of time during the high pressures to obtain larger hardness can implicate in reduction of the sensibility of the material [9].
Hard granite was installed horizontally on the table of a Physical simulator interfaced with computer type AMSLER modified microprocessor model AB800-E, manufactured by Contenco, using the software Pavitest – Abrasion Tester 2:31, to obtain the data.
Online since: June 2015
Authors: Dominique Planson, Dominique Tournier, Maxime Berthou
In the future, to optimize static and dynamic characteristics of SiC MOSFETs, its gate oxide quality will be improved by reduction of interfacial trap density, thus saturation current increase due to self-heating will be minimized and short-circuit capability improved.
Reduction of the collector current during the short-circuit had little impact on the SC capability of the BJT.
Tested BJT may require design improvements to show more stable results under SC to provide comparable data.
Online since: December 2007
Authors: Vladivoj Očenášek, Ivana Stulíková, Bohumil Smola, K. Šperlink, M. Kolář, J. Uhlíř, Martin Vlach, V. Neubert
. % purity, all composition data are further in wt.%) was alloyed with about 0.2 Sc and 0.1 Zr.
The MC alloy was rolled to the thickness of 1.9 mm (reduction 86 %), the PM one to the 1.2 mm (66 % reduction).
Online since: January 2009
Authors: Leszek Adam Dobrzański, Tomasz Tański
Out of the chemical composition examinations with the use of the EDS dispersive radiation spectrometer as well as literature data, one can conclude that it is the Mg2Si compound which, when precipitating, increases the hardness of castings.
Heat treatment contributes to improvement of mechanical properties, yield point and hardness with the slight reduction of the elongation.
The different heat treatment kinds employed contributed to the improvement of mechanical properties of the alloy with the slight reduction of its plastic properties (Table 3).
Online since: March 2007
Authors: Jai Sung Lee, Yun Sung Kang, B.H. Cha, H.G. Kang
Full densification of Fe-40wt%Ni nanopowder by pressureless sintering In order to investigate the full densification of nanopowder, Fe-40wt%Ni nanopowder was prepared by reduction of ball-milled oxide powders in a controlled hydrogen atmosphere [7].
Fe-8wt%Ni nano- powder was prepared in the same process of H2 reduction of ball-milled oxide powder.
The experimental data of Vickers hardness are summarized and compared with those of conventional grained Fe-8wt%Ni (>30 mm) in Table 1.
Online since: June 2004
Authors: Jeff B. Casady, J. Neil Merrett, Igor Sankin, W.A. Draper, Janna R. B. Casady
Motivation Along with the 4H-SiC Schottky rectifiers, which already have found a niche in the commercial market, 4H-SiC PiN diodes are expected to play an enabling and vital role in the design of future commercial and military hardware resulting in a large reduction in the size, weight, and cost of the power conditioning system [1].
Use of a thin base region allows for the reduction of switching losses by having a shorter lifetime without compromising forward drop.
From the comparison of the simulation results and the CV data obtained on a test sample, ~70% post-anneal activation of aluminum was expected.
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