Materials Literature
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Large span cable-supported bridges suffer greater risk of terrorful explosion than normal bridges do.The plastic deformation,rupture,tearing and energy dissipation of an orthotropic steel deck under blasting loads of hand-placed bombs and sedan bombs(TNT equivalent 10kg-500kg) were investigated with nonlinear finite e…
The change of the microstructure of carbon fiber with liquid-phase oxidation modification was investigated under different treatment conditions by Raman spectroscopy(Raman),Infrared spectroscopy(IR),and Scanning electron microscope(SEM).The relationship between microstructure and mechanical properties of monofiber was…
The new progresses in the combustion catalysts,divided into three aspects which are nano-catalysts,energetic catalysts and bi-metal catalysts,were reviewed.The characteristics of different combustion catalysts and its technical problems under development were summarized,and the new insights on the development of combu…
To obtain the accurate switched reluctance motor(SRM) model,the offline and online modeling schemes based on radial basis fuction(RBF) neural network are investigated in this paper.Firstly,an offline modeling scheme is studied.The flux linkage characteristics are obtained from experiment and used as a training data se…
通过对山西宁武亚高山湖群浮游植物群落结构的调查研究,共鉴定出浮游植物291个种、变种及变型,隶属于8门,45科,108属.各采样站点间种数相差较大,以马营海种类最多,干海最少.硅藻门、绿藻门和蓝藻门明显占优势,优势科、优势属和优势种也都较为明显.优势种有蓝藻门的细小隐球藻(Aphanocapsa elachista)、铜绿微囊藻(Microcystis aeruginisa)和小席藻(Phormidium tenue),硅藻门的库津小环藻(Cyclotella kuetzingii)、肘状脆杆藻(Fragilaria ulna)、尖针杆藻(Synedra acus),绿藻门的狭形纤维藻(Ankistrodesmus angustu…
In allusion to the difficulty of determining five parameters in Jiles-Atherton model describing hysteresis characteristic of iron core,by means of finding out impacting rule of each parameter on characteristic quantity of hysteresis loop,reasonable initial values to fit these parameters are decided.These parameters ar…
In order to investigate the combustion characteristics of boron in air,CO 2,N 2 and O 2 respectively,experiments were carried out with a high-temperature thermal balance at 50~1 100 ℃.Effect of particle size on the ignition temperature of boron was also studied.The single-curve model of Doyle integral method was adopt…
In order to resolve the complicated folded fabric modeling problem and establish the high quality finite element model for fabric working simulation in aviation or aerospace area,the Fluid Structure Interaction(FSI) method based on Arbitrary Lagrangian Eulerian(ALE) coupling theory was applied for modeling in this pap…
The conductivity of insulation oil and paper of the converter transformer is influenced by electric field strength,temperature and pressure etc.In order to study the influence of electric dependent conductivity on electric field distributions,the nonlinear characteristics between electric field strength and conductivi…
Micro-surfacing is widely used as an effective technology of preventive maintenance.However,for high temperature and rainfall in Guangdong region,micro-surfacing has many disadvantages,such as poor abrasion resistance and short life,which seriously influence the application of preventive maintenance in Guangdong provi…
Because of its high dielectric strength,low global warming potential(GWP),fluorocarbon gas is considered as a good substitute for SF6.Electrical equipment using fluorocarbon gas mixtures will be a new type of environment-friendly power delivery apparatus.Consequently,we experimentally studied main components of decomp…
To explore the fatigue properties of heavy-duty gear steel with different case depth,fatigue properties of heavy-duty gear steel 18Cr2Ni2MoVNb were investigated by means of rotating bending fatigue tests without carburization and after carburization.Results show that carburization can evidently increase the fatigue pr…
To meet requirement of UHV/EHV transmission development,study on electric field distribution along composite insulator surface and finding a reasonable electric field optimization method have become critical in transmission line operation safety.By finite element method(FEM),we established a calculation model for I,II…
A thermodynamic model of binary low-carbon microalloyed steel with 0.023% Nb and 0.012% Ti additions was established to calculate the equilibrium molar fraction and chemical driving force of carbonitride precipitation as well as the molar fraction of each element in austenite at temperatures from 1 073 to 1 523K.The e…
The carbon contamination of alloys melted by electro graphite crucible is impossible to endure owning to an inherit reaction between the melt and carbon. The TiFe-based alloy is prepared by vacuum induction melting (VIM) with CaZrO3 and electro graphite crucibles. The prepared samples are examined by optical microscop…
We report on synthesis of nanoscale graphene oxide(NGO) by modified Hummers'method.Synthesized NGO particles were surface functionalized by attaching carboxylic acid and polyethylene glycol groups to render them soluble in cell culture medium.The structures and properties of functionalized NGO were characterized by tr…
Effect of restraint degree on the expansion and tensile splitting strength of concrete containing MgO-based expansive agent(MEA) were investigated.The wall thicknesses of the mold used to restrain the expansion of concrete specimen were 5,7,10 mm respectively.The activity values of MEA used were 60 s and 150 s,and the…
Formate dehydrogenase(FDH) was covalently attached to surface-modified polyethylene(PE) hollow fiber membrane.The effects of inlet way of CO2,pH value,the type of buffer solution,and the concentration of the reduced coenzyme nicotinamide adenine dinucleotide(NADH) on the synthesis of formic acid from CO2 were investig…
A novel three-dimensional isolation bearing(3DIB) was proposed,based on respective mechanical characteristic of lead rubber bearing,combined disc springs and rhombic steel plated damper.Firstly,the configuration department and mechanical design methodology was introduced;the horizontal and vertical stiffness and energ…
A bamboo(Sinocalamus affinis) fiber composite with high specific strength and stiffness can be used for load-bearing wind turbine blades.The composite is made from 3～4 year-old bamboo culms that have been reconstituted and hot-pressed.Specimens,ranging in density from 1.08 to 1.20 g/cm3,were tested for tension,compres…