Materials Literature
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Based on the validation of the simulation model for intake-port fuel injection engine(PFI),the effect of back-flow on fuel evaporation mass is studied by numerical simulation method.The results show that for closed valve injection(CVI),the back-flow of hot gas from the cylinder is helpful to wall-film evaporation beca…
OBJECTIVE: To assess the effectiveness and safety of temozolomide capsule for glioma.METHODS: The relevant randomized controlled trials(RCT) were searched from the Cochrane Library,PubMed database(1996-2009),EMbase(1974-2009),ISI database(1986-2009),CBM database(1978-2009),CNKI(1994-2009),VIP(1989-2009) and Wanfangdat…
Objective To estimate the value of multislice spiral computed tomography angiography(MSCTA)in the diagnosis of the giant tumor of ovary and uterus.Materials and Methods The MSCT features of 71 giant tumors in ovary and uterus proved by surgery and pathology were reviewed.CT plain scanning and enhanced scanning were pe…
Aiming at the effect of mould shell refractory materisals on investment casting quality,cost and productivity,the performan and characteristics of zircon sand,fused silica,kaolin,bauxite and fused corundum investment casting shell common refractory were introduced.According to the actual production process conditions,…
Research progress in tin-based flame retardants was reviewed.The flame retardant mechanism of zinc stannate and zinc hydroxystannate and their application in poly(vinyl chlorde) were also introduced.Finally,the trend of the development of inorganic tin compound flame retardants was briefly explored.
Dielectric ceramics of Ba0.7Sr0.3TiO3 were prepared by two step Solid-state reaction method.The effects of cobalt and yttrium ion on dielectric properties of Ba0.7Sr0.3TiO3 were studied.Results indicted that the best doping concentrations of Y3+,Co3+ ions in ceramic samples are 0.04mol% and 0.05mol% respectively,Optim…
An acidic ionic liquid catalyst,which contains group of-SO3H was prepared by use of tributylphosphine and 1,4-butyl sultone,according to two-step synthesis methods.The structure of the catalyst was confirmed by IR spectrometry.The catalyst was used for the dehydration of methanol at different process conditions.The ex…
Based on the Deutsch assumption,a model for calculating ion current field under high-voltage direct-current(HVDC) transmission line is established with the charge simulation method by taking ground potential rise(GPR) as the first boundary condition.The calculation results without considering GPR agree well with those…
OBJECTIVE:To prepare Acetaminophen multilayer microcapsules and to investigate drug release property and mechanism of it.METHODS:Drug-loading(acetaminophen) multilayer(acacia-chitosan-acacia-chitosan) microcapsules were prepared by solution drying method(complex emulsion method) using chitosan and acacia as coating ma…
Contamination flashover problem has threatened the security and stability of transmission lines for a long time.The coastal environment,as a special one of our complex and diverse geographical environment,is much easier to achieve the transmission line flashover accident conditions.Some transmission lines also have th…
To guide the post heat treatment process of the 600 MPa grade cold-rolled dual phase steel,the evolution law of microstructure recrystallization was studied with metallographic microscopy and hardness testing.The influence of the recrystallization process on microstructure was analyzed,and the hardness of the sample w…
Thermoelectric materials Bi1.2Sb4.8Te9 was sintered under three different conditions including no-current sintering(NCS),low-current density sintering(LCS) and high-current density sintering(HCS).The microstructure and thermoelectric performance of three groups' samples were tested and compared.The results indicated t…
The Sm2Co15.24-xFexCr1.76(x=0.5,1.0,1.5,2.0,2.5) compounds are prepared by means of arc melting and high-temperature quenching.The structure and magnetic properties of the compounds have been investigated by using X-ray diffraction and Vibriting sample magnetometer.The powder X-ray diffraction patterns show that all s…
WPU/ATO hybrid dispersion was prepared through synthesized waterborne polyurethane(WPU) and nano antimony tin oxide(ATO) dispersion.The influences of the crosslinking reaction of γ-glycidoxypropyltrimethoxy silane(KH560) on the performance of formed films were investigated in paper.FT-IR proves that the condensation r…
By brinell hardness tester,universal testing machine,electrical conductivity meter,OM,SEM,EDS and X-ray diffraction,microstructure and properties,phase and components of CuCo2Be alloy after different heat treatment were investigated.The results show that the optimal heat treatment process of CuCo2Be alloy is solution…
The phase transformation and microstructure of Q345E steel during continuous cooling were studied by THERMECMASTOR-Z thermal mechanical simulator.The continuous cooling transformation diagram(dynamic CCT diagram) of the steel was drawn by thermal dilatometer test.The results show that the polygonal ferrite is obtained…
Polymer dispersed liquid crystals(PDLCs) were prepared by UV photopolymerization of the mixture monomers of 2-ethylhexyl acrylate(EHA),ethylene dimethacrylate(EDMA) and pentaerythritol tetraacrylate(PETTA) in the presence of liquid crystals P0616A and photoinitiator Irgacure 184.The effects of different alcohols with…
Using zirconium nitrate,manganese nitrate,iron nitrate and glycin as reactants,ultra-fine metal oxide precursor was synthesized by solution combustion;the metal oxide precursor was reducted by calcium hydride at different temperature to form fine-powders of ternary alloy ZrMnFe.TG/DTA,XRD,SEM,EDS were used to characte…
According to the operating character of the ship reactor,the medium break loss of coolant accident(MBLOCA) combined with blackout accident was studied.The accident response sequence was established for the combined accident.The 30 mm unsegregated MBLOCA combined with blackout accident was analyzed with RELAP5/MOD3.2 c…
To clarify the effects of alloying element Ca on properties of Mg-6Al-0.3Mn-0.5Zn-1.5Sn-0.3Sr-xCa(x=0,0.5%) and Mg-6Al-2Si-0.3Mn-0.5Zn-1.5Sn-0.3Sr-xCa(x=0,0.5%) alloys at different working temperature,the phase constituent,microstructure,fracture morphologies and tensile properties at room temperature and 150 ℃ were i…