Materials Literature
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The flow stress behavior of 2026 aluminum alloy during hot compression deformation was studied bythermal simulation test on Gleeble 1500 system at deformation temperature range from 300 ℃ to 500 ℃ and strain raterange from 0.01 s-1 to 10 s-1.The results show that the flow stress exhibits a peak stress at critical stra…
The evolution of silicon phase configuration and Si-Al interface in Sip/Al composites(φ(Si)=65%) fabricated by squeeze casting technology during high temperature heat-treatment were investigated.The microstructure was observed by optical microscopy,transmission electron microscopy and high resolution electron microsco…
Objective:To examine the expressive differences of age-related molecular vimentin in the testis and epididymis tissues of different months old rats and to investigate the regular changes of the characteristic molecular expression in the process of maturity and senescence of the testis and epididymis so as to provide t…
The nonisothermal crystallization behavior of PA6T was investigated via differential scanning calorimetry(DSC).Avrami equation,Ozawa approach and a new method developed by Mo were adopted to study the nonisothermal crystallization of PA6T,and activation energy value of PA6T was determined according to the Kissenger me…
Chondroitin sulfate from tilapia skull was obtained using a combined method of alkaline extraction and enzymatic hydrolysis.Orthogonal array design was adopted to optimize technological parameters of alkaline extraction and enzymatic hydrolysis for maximizing yield and purity of chondroitin sulfate, respectively.The o…
The blue white LiSrBO3∶Ce3+ phosphor was synthesized with solid-state method.The emission spectrum of LiSrBO3∶Ce3+ phosphor shows one dissymmetrical band at 436 nm.The excitation spectrum for 436 nm emission has broad band at 369 nm.The crystallographic sites of Ce3+ in LiSrBO3 were calculated by Van Uitert formula.Th…
In order to obtain the mechanism of material failure caused by high speed liquid droplet impact,numerical and experimental study were carried out.A review of the research situation in liquid-solid impact was made,and then a numerical.Model has been developed using finite element method-smoothed particle hydrodynamics…
p-Si100 substrates were used to make textured structure in alkaline and IPA solution,ZnO∶Al thin films were deposited on textured Si substrates by ultrasonic spray pyrolysis techniques.Front and back electrode were prepared by techniques of lithography,metal sputtering and high vacuum evaporation,and subsequently anne…
The composite membranes of poly(vinyl alcohol)/silk fibroin(PVA/SF) are prepared by solution blending.SF is found to disperse in PVA in the form of spherical particles with diameter of 100～200nm.Tensile strength and Young's modules increase with the content of SF when the content is below 40%.Alternate soaking process…
A metal-organic coordination polymer {[La(PDC)(N-HPDC)].H2O}n (1) (H2PDC=pyridine-3,4-dicarboxylic acid) has been hydrothermally synthesized and structurally characterized by X-ray diffraction single-crystal structure determination,elemental analyses and IR spectroscopy. The complex crystallizes in the monoclinic syst…
The carbon-based solid acid is a catalyst with high catalytic activity and stability.It can simultaneously catalyze the esterification of methanol with fatty acid and the transesterification of methanol with triglyceride when the waste oils with high acid value are used as the raw material for the preparation of biodi…
Core-shell Au@Ag nanoparticles were prepared by the sol method and deposited on TiO2 nanoparticles by the powder-sol method and the hydrothermal method.The structure of sol and Au@Ag/TiO2 was characterized by UV-Vis,XRD,and TEM techniques.The activity of phtocatalytic elimination of ozone was investigated on Au@Ag/TiO…
A super-hydrophobic surface is a surface with a water contact angle higher than or close to 150°.This review covers the preparation methods,with particular focus on the latest two years,expounding different ways to fabricate rough surfaces and low-surface-energy modifications.In addition,the study and application of n…
A large number of initiating devices are bestowed to complete the specially designated given functions for spacecraft.They usually bring about violent pyroshock environment under which the instruments and equipments can't work normally.This paper introduces a new type of the special bomb based on the principle of a pi…
The influence of the interface effect of the inclusion particles in the electromagnetic composite material on the electromagnetic wave Absorbing characteristics has been investigated in this study.Firstly,the basic wave Absorption and reflection theory and the reflect loss formula of the electromagnetic wave are intro…
Ferromanganese slag as a byproduct of manganese ferroalloy is treated as a waste.Therefore,it has important significance to use it effectively as concrete admixture.In this research,the C20,C40,C50 concrete with different content of ferromanganese slag were experimented,to test their changing tendencies of compressive…
Quartz grains were extracted from granite. Bleaching was carried out in four different area chosen for their different altitudes (Beijing, Yinchuan, Germu, Lhasa), in order to observe their behavior under different intensities of the UV (Ultra violet) component of sunlight. The result of our experiments indicate that…
With epichlorohydrin and sodium bisulfite as raw materials,the intermediate 3-chloro-2-hydroxy propane sodium sulfonate was firstly obtained,and then the object product tetradecyl hydroxysulfobetaine(THSB) was synthesized.The structure of product was identified by FTIR,a series of performance such as surface tension,e…
Objective The effect of free nitrogen forms on growth and physiological index and mechanism of Ceratophyllum demersum were investigated to provide scientific basis for using Ceratophyllum demersum to improve water condition.Methods Using static laboratory experiment,the effect of free ammonia on height,biomass,livabil…
An investigation is made on UV-Vis adsorption spectra and bacteria inhibition of bulk ZnO and nano ZnO prepared with thermo-plating hard Zn with Fe.The investigation of UV-Vis adsorption spectra shows that nano ZnO has higher absorption in the ultraviolet region and lower absorption in the visible region than bulk ZnO…