Materials Literature
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Key electrochemical materials are the most important factors for cost reduction and commercialization of proton exchange membrane fuel cell(PEMFC).In this paper, domestic key materials for fuel cells including graphite fiber carbon paper, perfluorosulfonic acid proton exchange membrane and Pt/C catalyst were utilized…
The insulation of power transformer plays a vital role in its safe operation. On the basis of the aging chemical reaction of insulating paper, by characterizing the degree of polymerization (DP) of cellulose paper, the kinetics of chemical reaction is employed to evaluate the aging lifetime of power transformers, and…
Based on Mn-Mo-Nb system with three different content,the effect of finishing rolling parameters and rolling temperature as well as the content of C and Mo on yield strength and DWTT shear area values of X80 hot strip pipeline steel were investigated.The results are of practical significance to improvement yield stren…
Novel biodegradable poly(5-hydroxylevulinic acid-co-D,L-lactic acid)(PHLA-DLLA) was synthesized via melt copolycondensation of 5-hydroxylevulinic acid(5-HLA) and D,L-lactic acid(DLLA) and characterized with gel permeation in chromatography(GPC),Fourier transform infrared spectroscopic(FT-IR) and differential scanning…
The finite element method was employed to simulate the crack growth behavior of ceramics matrix composites.The model used the combined elements for simulating the separation between matrix and fiber and the contact elements for simulating the friction between matrix and fiber,considering interfacial bond strength on t…
tanium powder, graphite powder and copper powder were accurately weighed, mixed and milled to attain different Ti/C ratios in moles. The powder mixture was added into the melting copper after pressed into compact. The high temperature of the melting copper makes the titanium in the compact react with graphite drastica…
Objective To determine the short-term and long-term distribution of nano-Fe3O4 and nano-TiO2 in mice.Methods Nano-Fe3O4 and nano-TiO2 were injected into abdominal cavity of the mice and their contents in the tissues were detected by AAS and ICP-OES,respectively.Meanwhile,histopathological evaluation was carried out.Re…
The specific heat capacity of carbohydrazide perchloric acid energetic coordination compounds was studied by differential scanning calorimetry (DSC). The specific heat capacity of [Co(CHZ)3](ClO4)2 was mensurated at 50-140 ℃ and the specific heat capacity of [Mn(CHZ)3](ClO4)2,[Zn(CHZ)3](ClO4)2 and [Ni(CHZ)3](ClO4)2 wa…
Powder X-ray diffraction(XRD)is a non-destructive forecasting and analysis technique with the widespread applications.During the experiment teaching,the phase composition of the sample was analyzed by XRD.The purpose of the experiment is that the constitution and the principle of XRD analyzer are introduced to student…
The effects of the Ce content on the microstructure,the melt properties,the spreadability and the creep rupture life of the Sn3Ag2.8Cu lead-free solder alloy were studied.The results show that the melt properties of the Sn3Ag2.8Cu solder aren't significantly effected by the trace Ce,but the spreadability can be obviou…
The tile adhesive was prepared by adding different types of re-dispersible emulsion powder and PVA powder and according to different proportion. The tile adhesive was formed under diffirent maintaining condition such as room temperature maintaining, heat maintaining or water maintaining. The relevant performance of ti…
Sugarcane bagasse(SCB) was mechanically activated by a stirring-type ball mill.Graft copolymer(SCB-g-PAA) of SCB with different mechanical activation times and partially neutralized acrylic acid(AA) was synthesized by free radical polymerization using ammonium persulfate/sodium sulfite redox pair in aqueous solution.T…
The function mechanism of zinc immersion film was analyzed.The formation mechanism of zinc coating on magnesium alloys was investigated by using current density-time and open potential-time curves at constant potential.It is found that the electrocrystallization of nickel on magnesium alloy is a successive nucleation…
A strain was isolated and screened from the natural fermentation liquid of silk by combing the plating dish and degumming,and the remnant sericin of silk treated by it dropped to 5.12%.The isolated strain was identified and characterized as Bacillus cereuson the base of its morphology and 16S rDNA sequence analysis as…
Mg-8Li-3Al-xY(x=0.5,1.0,3.0) alloys were prepared with vacuum induction melting method.Effect of yttrium content on microstructure of the alloys was studied.Results show that yttrium causes the α(Mg) phase refinement and spheroidization.With the increase of Y,the Al2Y phase exists in alloy.
This paper investigated the influence of assumptions in soot volume fr action measurement by thermocouple particle densitometry (TPD) method in laminar nonpremixed ethylene/air diffusion flame. TPD method is based on an extension o f the theoretical treatment of Eisner and Rosner, who assumed that the particle deposit…
The phosphors,Ca8Mg(SiO4)4Cl2∶Dy3+ and Ca8Mg(SiO4)4Cl2∶Eu2+,Dy3+,were synthesized by high temperature solid state reaction.The emission spectrum of Ca8Mg(SiO4)4Cl2 activated by Dy3+ consists of two emission bands: blue band and yellow band,originated from 4F9/2→6H15/2,and 4F9/2→6H13/2 transition.Dy3+ concentration aff…
The performance of the Cu/Zn/(Fe, Mn, Cr)/AlO catalysts were investigated at 220 ℃ for methanol steam reforming . The mole ratio of steam to methanol was 1.3, and the liquid space velocity was 1.5 h-1. The adding of Cr can enhance conversion of methanol and reduce CO production rate .CO content decreased 54% while the…
In order to clarify the characterization of Chinese fir wood(Cunninghamia lanceolata Hook)/Camontmorillonite (Ca-MMT) intercalation composite,the authors of this paper determined its color through a colorimeter,studied the micro-structure through scanning electron microscopy(SEM) graphs and X-ray diffraction (XRD) cha…
Unevenness is an important evaluation index to the classification of cotton yarn.Unevenness not only leads to an increasing spinning breakage rate,but also seriously spoils the appearance of fabrics.This paper introduces some influential factors on cotton yarn evenness,and by the orthogonal test the spinning process p…