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Online since: July 2013
Authors: Xiao Bin Yan, Li Hui Zhang, Jian Lin Xu, Jian Bin Zhang, Fen Ran, Lei Niu, Jia Wang
Some researches show that high cathode over potential is not only the prerequisites of promoting nucleation and inhibiting grain growth, but a key conditions of obtaining nano-crystalline.
When current density is overlarge, a large number of antimony particles will gather on the cathode and can’t be effectively coated by surface dispersants, resulting in the increasing of the particle size of antimony nanoparticles.
) (012) (104) (110) Fig.6 TEM micrographies of antimony nanoparticles The effect of surface dispersants, current density, electrolysis time on the microstructure, morphology and particle size of antimony nanoparticles is studied basing on a large number of experiments in this paper.
Online since: June 2012
Authors: Zhao Lu Xue, Chang Lei Niu, Hao Ran Lu, Cai Wang, Hao Wang, Shao Hong Wang, Zhao Xia Hou
A large number of mutual connected crack appear from the C1# sheet; The C2# sheet has a good flexibility and lubricious surface while C3# sample has good film-forming performance, but has an un-even surfaces and it is difficult to demould.
It is shown that when sintered at 950°C, large number of µ-cordierite crystal phase and few amount of α-cordierite crystal phase are separated out of the cordierite sintered compact.
When the sinter temperature is 1000°C, viscous flow of liquid phase promotes the bond between particles polymerization, compel gas to remove along with the grain boundary and improve the density of cordierite sample.
Online since: March 2015
Authors: Jun Feng Li, Jian Ping Long, Da Wei Luo
When the concentration of carbon exceeds its solubility limit in silicon, it will precipitate to form silicon carbide (SiC) particles, which can cause severe ohmic shunts in solar cells and result in nucleation of new grains in silicon ingots [2].The boron–oxygen complexes acting as recombination centers of photo carriers cause a serious problem of light-induced degradation in solar cells [3].Oxygen precipitation is known to act as intrinsic gettering sites for impurities and to affect the mechanical strength of the wafer [4].Carbon, oxygen and SiC particles in a solidified silicon ingot can cause significant deterioration of the conversion efficiency of solar cells.
Ingot and ingot number.
Each of the mc-Si blocks is wire-sawed into a number of mc-Si wafers of certain thickness such as 200um.
Online since: October 2012
Authors: Singaravelu Ganesan, Sruthi Kattamanchi, Rathinam Vasudevan, Ramasamy Jayavel
A number of reports were published in the BaCeO3 (Barium Cerates), but there are lot of challenges in studying the conduction properties.
Yttria is used as a promising protonic rare earth ion to enhance the ionic conductivity of the matrix due to their high ionic transporting number [2].
The increased densification may be due to the finer grain size distribution of particles with reduced porosity, which agreed with the SEM results.
Online since: April 2009
Authors: Tatsuki Ohji, Yoshitake Masuda, Kazumi Kato, Xiu Lan Hu
Porous films with very large internal surface area offer a number of intriguing features which have been exploited for the design of optoelectronic devices[5].
Nanostructured ZnO electrodes based on interconnected spherical particles have shown low efficiency of photocurrent due to charge-carrier recombination losses at grain boundaries between the nanoparticles in the film.
In this study, PEI, as an additive, contains a large number of amino groups in the long molecular chain, which could preferentially adsorb at different crystal faces and modify the surface free energy and growth rate [9].
Online since: August 2014
Authors: Ying Wei, Shao Guang Huang, Rui Min, Qi Jia
Zero-Crossing Rate In a voice frame, the number of signal waves crossing zero level is defined as Zero-Crossing Rate (ZCR).
These vectors are arranged as a projection matrix giving a number for each of them in order.
Coggins and Jose Principe, Detection and Classification of Insect Sounds in a Grain Silo using a Neural Network [4] Nellenbach C.
Online since: September 2015
Authors: Gia Thinh Bui, Da-Chen Pang, Yi Ze Chen
By designing cell membrane in a ratio one to two, the minority transmission/ majority reception mode reduced energy loss proportionally to the number of cells.
The higher output signals may result as the CMUT design is in proportionality to the cell number.
Hilton, Image surface roughness using correlated speckle grain pairs, Report No.
Online since: August 2012
Authors: Ke Qiang Yu, Shuang Xi Wang, Yong San Cheng
It is medium-grained sand.
After 24 h, Numbering and dismantling formwork, finally try body was kept in a maintenance box with the temperature of 20 ± 3℃during this time related performance tests were conducted [3]. 3 Test results and analysis Due to limited test equipments, in this paper only recycled concrete strength and stress-strain curve as part of the test results were tested.
A large number of research data show that, with the increasing ratio of recycled aggregate, recycled concrete strength is becoming lower and lower; But there are also data show that if the old concrete has high compressive strength, that is the strength of the recycled aggregates higher than that of recycled concrete, the recycled concrete intensity will increase with the increase of the ratio of recycled aggregate [6].
Online since: July 2012
Authors: Qing Li, Rui Zhi Wen
The particle size and the crystalline structure of the product samples were detected by means of X-ray analysis with a BD-86 diffractometer(Japan) and Mastersizer 2000 Laser grain-size analysis meter(England).
The main reason is that the number of the TiO2 surface hydroxyl restricts the photocatalytic activity[11].
This is mainly because charge layer thickness on the surface of the TiO2 decrease along with the increase in the number of lanthanum-doped.
Online since: June 2010
Authors: Tian Ying Xiong, Jian Zhong Qi, J.X. Wu, S.Q. Du, Hao Du
Typical pores formed in sintered or foamed metals are irregular and have a great number of acute angles acting as stress promoters.
Based on the results from some investigations [4-6], a variety of attractive properties were produced separating gasar metals from a number of traditional porous metals.
The orientation of the grains was determined using a Rigaku RIU 300 X-ray diffractometer on transverse sections of the specimens.
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