Materials Literature
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Neutrons in different energies have different shielding methods,the application of cement-based materials for neutron shielding is very important.In this paper,base of the neutron shielding,the shielding theory of neutron is introduced,the recent developments of cement-based materials for neutron shielding are reviewe…
CaxMgy(VO4)n∶Eu3+ was synthesized by combustion method with the Ca/Mg(x/y) molar ratio of 10/0,9/1,8/2,7/3,6/4,5/5,respectively.X-ray diffraction(XRD) was employed to check the phase composition.The results show that Ca3(VO4)2 is the main crystal phase when x/y8/2,and Ca5Mg4(VO4)6 appears when x/y=8/2.Fluorescence spe…
Objective To study the synergistic bactericidal effect of ultrasonic,heat and peracetic acid,and to provide basis for practical application for medical instrument sterilization.Methods Quantitative carrier test and qualitive bactericidal test were taken to evaluate the synergistic bactericidal effect of ultrasound,hea…
Anodic oxidation coatings were made on LY12 aluminum alloys by anodic oxidation in sulfurix acid.Then,γ-glycidoxypropyltrimethoxysilane(γ-GPTMS)/tetraethylorthosilicate(TEOS)hybrid films were prepared on the coatings by sol-gel method.The results of polarization curve and electrochemical impedance spectroscopy(EIS) me…
Medium manganese steel was produced by reducing carbon and manganese content of the high-manganese steel.Research results show that the matrix after water quench at the temperatures of 1050～1070 ℃ is austenite carbide(+0 ～W2 class).The medium manganese steel,whose wear resistance is better than that of the high mangan…
With a brief introduction on the properties and features of SMA pavement,starting from raw materials,construction technology,and joints processing and so on,it describes the SMA pavement construction quality control measures,and puts forward matters needing attention in construction process,with a view to guide practi…
Different initial solution compositions of HF/KF were prepared in this paper,and the solution can be used to the surface treatment of hydrogen storage alloys.According to the investigation on the pH value of solution and the concentration of fluorion,we draw a diagram concerning the composition of the fluorination sol…
The microstructure and mechanical properties of Mg15Al-x(x= Zn,Nd,Si)alloy were investigated by OM and tensile property test respectively.The results showed that the primary α-Mg and β-Mg17Al12 phase in Mg15Al magnesium alloy were obviously refined in varying degrees by adding Zn,Nd,Si element.The needle-like Al11Nd3…
Protein folding is one of the most challenging problems in modern science.Several decades after Anfinsen's pioneering work,the mechanism governing protein folding remains elusive.Nevertheless,significant progress has been made toward decoding the folding of a few model systems.This review will focus on the progress in…
Reactor sealing system failure of catalyst unit in a factory was analyzed.According to characteristics of seal using in reactor,the original mechanical seal was reformed to packing seal.Process equipment has been improved,too.Finally,the problem which the reactor did not run properly,the high cost of parts consumption…
The time-temperature-property(TTP) curves of 6061 extrusion aluminum alloy were determined by an interrupted quenching method.The results show that the quenching sensitive temperature range of the TTP curve of the alloy is 250 ℃～ 450 ℃ with the nose temperature of 360 ℃.The transformation is fast at the moderate tempe…
Unilateral double four-way tube hydroforming technology was considered as the research object,numerical simulation method was utilized to analyze branch height,thickness distribution and feeding for unilateral double four-way tube hydroforming under different loading paths,then,general rule of distribution and feeding…
The compound surface treatment of micro-arc oxidation(MAO) and sol-gel with different layers was used to enhance the corrosion resistance of 6061 aluminum alloy.The microstructure,composition,phases and corrosion resistance of the coatings were investigated by means of SEM,XRD and electrochemical tests.The results sho…
Nb-16Si-22Ti-6Hf(-2Cr-2Al) alloys were prepared using vacuum induction melting in Y2O3 crucible,and the heat treatment was conducted at 1500℃ for 100h.The constituent phases analysis show that the ingots are composed of the phases of Nb solid solution(NbSS)、 Nb3Si、 β-Nb5Si3 and γ-Nb5Si3.The cooling rate,alloying eleme…
Nanoscale gold activation fluid with catalytic activity was formulated and used for activation of ceramics before electroless Cu plating.The effects of bath composition,temperature and loading capacity on the deposition rate of electroless Cu coating were analyzed using a scanning electron microscope,an energy dispers…
The kinetics of the title complex [Co(phendione)(SO4)(H2O)] ·5H2O was studied under the non-isothermal condition by TG and DTG techniques.The results showed that the thermal decomposition reaction mechanism of the complex in the first stage was phase boundary reaction(three dimensional),apparent activation energy and…
A one-dimensional unsteady model simulating the trapping process of fine particles by wall-flow filter was developed to simulate the flow field and particle layer distribution in a channel.Numerical simulation was conducted to investigate the influence of non-uniform distributed wall permeability of the filter on the…
Soluble dietary fiber(SDF) was prepared by twin-screw extrusion of defatted corn spermoderm,and the extrusion conditions were optimized by response surface analysis.On the basis of one-factor-at-a-time experiments,the optimal extrusion conditions for maximizing SDF content in final products were determined by using a…
Few mending materials applicable to underwater repairing work have been developed.Therefore,it is significant to synthesize a new mending material for underwater construction.The presented material is a composite one dominated by inorganic ingredients with the aid of superimposed effect of composite cement and additiv…
Sodium ibandronate(1) in total yield of 36.6% was synthesized in without solvent by phosphorylation and neutralization of 3-(N-methylentylamino)propionic acid hydrochloride(2) which was prepared by condensation and hydrolysis from methyl acrylate with N-methylpentylamine(3) produced by the reaction of pentyamine.The s…