Materials Literature
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This paper is intended to establish a predicting model for detecting sound absorbing properties of activated carbon fiber materials.The sound absorbing properties of viscose-based activated carbon fibers with different specifications were tested using an impedance tube in the 250-1 600 Hz middle and low frequencies ac…
Proton exchange membrane(PEM)fuel cells are electrochemical devices that covert the chemical energy to electricity directly.This study was concentrated on the air supply system.This paper presented an improved four order fuel cell air supply system model,analyzing its constraints.And the linear parameter varying(LPV)m…
Layered double hydroxide(LDH)/carbon nanotubes(CNTs) composites were prepared by urea method in the aqueous suspension of CNTs.Effect of CNTs concentration on the morphologies and structures of LDH/CNTs composites was investigated in detail.The results showed that in the case of low(0.2 g/L) or very high(4.0 g/L) CNTs…
Explosion experiment has been carried out on a pre-cracked 304 stainless steel cylindrical tube to investigate the ductile fracture behavior of explosion containment vessels(ECVs).Scanning electron microscope(SEM) observations were conducted on the fracture surfaces,features of shear localization dominated ductile fra…
Polyurea microcapsules containing hexadecane were prepared by interfacial polymerization method.Isophorone diisocyanate and water were used as monomers in the system and PVA was used as emulsifier.The microcapsules had smooth surface and narrow particle size distribution.Differential scanning calorimetry(DSC) was used…
Partial discharge in the power transformer is the main manifestations of the transformer insulation deterioration.Partial discharge detection plays an important role in the security and stability operation of the transformer.The propagation of ultrasonic wave in the transformer and four kinds of discharge mode are ana…
The interfacial dilational rheological properties of a novel polyacrylamide derivative,branch-preformed particle gel(PPG),were studied by interfacial tension relaxation measurements.The effects of electrolytes and conventional polyacrylamide on dilational rheological properties of PPG were studied.The dilational elast…
In order to provide technical assistance to the safe landing of space landers,the bearing capacity of lunar soil is studied in this paper.The lunar soil is too extremely precious to be used in in-situ tests.Therefore,TJ-1 lunar soil simulant which was developed by the authors recently was selected as the substitutive…
Purified multiwall carbon nanotubes(M WCNTs) were modified with formaldehyde and the dispersibility of MWCNTs was greatly improved after modification.The modified MWCNTs were used to study the adsorption of uranium from aqueous solution.pH, contact time, temperature, initial concentration of uranium and modified MWCNT…
Compared with old standard GB 13223-2003, Emission Standard of Air Pollutants for Thermal Power Plants(GB13223-2011) has much more change in emission limitation. In the light of emission limitation of the new standard, the paper will briefly analyse the development tendency of flue gas pollution control technology abo…
The short-term corrosion behavior of Q235 and X70 steel samples buried for one year in the test trench in a typical mountain sierozem area in Calgary,Canada was investigated by corrosion rate measurement,corrosion characteristic observation and analysis through scanning electrochemistry microscopy and X-ray diffractio…
Special silicon mullite brick for transition belt of cement kiln was prepared using bauxite clinke,white fused alumina,silicon carbide,guangxi white clay,alumina micropowder additions as main starting materials,and sulfite pulp waste liquid as binder.Effects of alumina micropowder additions on cold physical properties…
Vacuum brazing of 316L stainless steel with BNi7 Ni-based filler metal was carried out.The influences of brazing clearance and holding time on microstructure,element distribution and microhardness of the joint seam were studied by optical microscopy,scanning electron microscopy,energy dispersive X-ray spectroscopy and…
The nonlinear coefficient of the transmission line equations for passive intermodulation(PIM)model of microstrip lines was determined based on electrothermal coupling effect.Considering the fact that the distributed resistance per unit length of the transmission line can be influenced by the Joule heating effect from…
Titanium is the main raw materials of titanium powder metallurgy,its quality and production cost li-mits the large-scale development of titanium powder metallurgy.The basic principle of mechanical alloying,hydroge-nation and dehydrogen process(HDH),atomization,metallothermic reduction,molten salt electrolysis preparin…
The lead anode slime is the main material producing silver in China,but the yield rate of silver is affected by such impurities as stibium and bismuth,so it is essential to separate such metal elements as stibium and bismuth for the production of gold and silver by using the lead anode slime.Through the experimental r…
For reasonable designing a high voltage direct current(HVDC) simulation test line section,it is necessary to study the relation between the length of the line section and the distribution of total electric field at the ground level.Therefore,we put forward an optimized charge simulation method using point charges to c…
The study focuses on the remanufacturing of the disabled crankshaft caused by cracks by the laser cladding repair technology in this paper.The specific process,environment of laser cladding technology and the selection about cladding material is discussed in the first place.Then simulation analysis is carried out to s…
Nano-silica particles were successfully prepared by the hydrolysis and condensation of tetraethyl orthosilicate( TEOS) using ammonia as a catalyst. Effects of ammonia concentration,preparing temperature on gel time and diameter of nano-silica particles were studied. Laser particle size analyzer,automatic adsorption in…
A stably transformed Bombyx mori BmN cell line expressing red fluorescence protein gene was established for judging whether the cells have been infected by Bombyx mori nucleopolyhedrovirus(BmNPV) and for rapid and easy determination of BmNPV titer.Firstly,an expression cassette of Discosoma red fluorescent protein gen…