Materials Literature
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An adhesive material was developed in which E-44,a widely used epoxy resin was used as matrix,and silicon nitride,boron nitride,aluminum oxide and silicon carbide were used as thermal-conducting insulating fillers.The thermal conductivity was adjusted by adding various amounts and types of materials mentioned above an…
In this paper the normal vibrations of NH_3 molecule has been studied by using the group theory. Firstly,the group character of NH_3 molecule has been obtained and the irreducible representations of the normal vibrations of NH_3 molecule are A_1 and E.Six normal vibrations of NH_3 molecule have been gotten by using th…
Aqueous solution was prepared with flake polyvinyl alcohol(PVA) and this solution was added in cement mortar for investigation PVA effect of cement mortar properties.The performances of formative complex-mortar were tested and correlation mechanisms were studied by the way of normal test methods and modern measure tec…
In order to study the acoustic insulation property of glass fiber fabric,three different types of glass fiber plain weave fabrics EW100,EW200 and EW300 with different fabric densities,linear densities,layer numbers were collected for the tests and analyses.The acoustic insulation properties of these fabrics were measu…
Epoxy resin(EP) with excellent performance was widely used as electronic encapsulation materials, but the traditional EP can not meet require of nowadays electronic encapsulation materials in wet-heat resistance, flame retardant,insulation and other performance. So the current research progress of EP with wet-heat res…
With the molecular dynamics simulations based on modified embedded atom method(MEAM) potentials,the discussion was presented about the diffusion behavior of the interfacial reaction in the soldering wetting process,and the theoretical analysis was used to explain the soldering diffusion process on the base metal from…
In this paper,the planar impact of the flyer on the target is simulated by the standard smooth particle hydrodynamics(SPH) for Armco iron and OFHC.Johnson-Cook tensile cumulative damage model is applied to obtain the spalling damage of the target.The simulation results of 2D spalling damage of the target are shown.And…
The microsporogenesis,megasporogenesis,the development of male gametophyte,female gametophyte,embryo and endosperm,and double fertilization of Conyza canadensis(L.) Cronq were studied in this paper.The results show as follows:the anther is tetrasporangiate and its mature wall comprises of an epidermis,endothelium,a mi…
Based on the Fresnel diffraction theory,the influence of the vertex manufacture precision of an axicon on the light propagation is analyzed in detail.It is points out that the axicon is equal to a plano-convex lens for focusing the beams when the vertex is machined to a circle.However,the blunt-tip region of a real ax…
Penetration mechanics is important both as a science and in practice of military engineering.For a quasi-steady penetration of long rod projectile into semi-infinite thick target,a simplified model is developed, where the bullet incorporated mushroom head consists of unbroken zone,crush zone and hole dilating zone, an…
Carbon nanotubes(CNTs)/AM60 magnesium matrix composites were fabricated by cast with stirring, and the characteristic of the stirring technology was studied. The mechanical properties of the composites were tested, and the fractographs were observed and analyzed via scanning electron microscope and energy spectrum ana…
Silicon oxide is one of the thin films well known in semiconductor industry. It is commonly obtained by chemical vapor deposition (CVD). For this deposition technique, the great disadvantages are high temperature and dangerous reactants as silane (SiH4), dichlo-rosilane (SiH2Cl2), ammonia (NH3). The reactive magnetron…
According to the working requirements of hypersonic spacecrafts,reusable space vehicles and next generation rocket engines operating under the ultra-high temperature condition,a proposal to improve the anti-ablative property of 2D C/SiC composites by introduction of ZrB2 was presented.2D C/SiC-ZrB2 composites with dif…
Alginate was selected to immobilize the centrifuged bacteria and create a kind of micro-environment for bacterial growth and enzyme digestion on the surface of the specimen.SEM results showed that the obtained composite layer consisted of regular spherical particles and porous network.It is preliminarily concluded tha…
In order to understand the phytoplankton community structure and the phytoplankton's demands for environment in Shanghai park lakes,a field survey was conducted in 11 park lakes in Shanghai in July and September 2008,with the relationships between the distribution of phytoplankton species and the environmental factors…
Using the thermodynamic model of the substituting atoms,the stacking fault energy(SFE) of Ni-Al-Ta/Mo alloys has been calculated,and the influences of the elements and temperatures on SFE of Ni-Al-Ta(Mo) alloys have been analyzed.Results show that the SFE of Ni-Al-Ta /Mo alloys decreases obviously with the increase of…
Three alumina coatings were prepared via air plasma spray(APS) with alumina particle size distributions of 22.5～45 μm(L powder),5～40 μm(M powder) and 5～22.5 μm(S powder) as feedstock.Microstructure and fundamental performance for three coatings were characterized,and the particle temperature and velocity in plasma plu…
With the help of optical microscopy,scanning electron microscopy,hardness test and electrical conductivity measurement,the distribution variation of the eutectic phase with annealing temperature of recrystallization in Al-1wt%Si alloy was observed and effect on microstructure and performance of the alloy was investiga…
Based on the Landau-Lifshitz-Gilbert equation,bruggeman effective medium theory and nano-particle films dielectric electric transport theory,calculated the effective permeability and the effective permittivity of the magnetic nanoparticles,an analytic calculation of saturation magnetization,anisotropy field,electrical…
This paper employs the CS4410 mechanical test machine and Hopkinson tensile bar to carry out the tensile test with the strain rate ranging from 0.001 s-1 to 3300 s-1.Results show that there are evident strain hardening and necking phenomena for both materials at different strain rates;both materials all exhibit compar…