Materials Literature
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CaZrO3 : Sm 和 CaZrO3 : Sm， Gd nanophosphors 被一个灵巧、有效的大音阶的第五音胶化燃烧方法综合。他们的结构和光性质被学习。photoluminesce (PL ) 结果证明黄磷能由在在可见轻区域(350-430 nm ) 的波长的照耀是高效地激动的。CaZrO3 : Sm nanophosphor 展出了强壮黄绿色，有在 565 nm (4G5/26H5/2 ) 集中的山峰波长的橘子和红排出物， 601 nm (4G5/26H7/2 ) 和 645 nm (4G5/26H9/2 ) 分别地。Gd3+ 离子的加入能极大地改进光紧张。最高的排放紧张与 2 mol.%Gd3+ 被观察做的 CaZ…
Electronic and atomic structures of LiP5, Li3P7 and LiP, which are formed in the process of lithium intercalation into black phosphorus, are systematically studied and analyzed using first-principles ultrasoft pseudopotential method based on the density functional theory (DFT). By caculating the electronic strucrures…
Conductive polymers polyaniline (PANI) and polypyrrole (PPy) loaded mesoporous silica (SBA-15) composites are prepared and characterized. The one-dimensional reference bar method and the relevant devices to measure the thermal conductivity are introduced and established. The equivalent pore diameter is proposed to cha…
The dynamic responses of cerium under low pressure, including γ →α phase transition, are numerically studied in this paper. The velocity profiles of shock experiments show that the transition process between the two phases is smooth and there is no obvious disconnection between the two plastic waves of the particle ve…
A series of AlGaN/GaN/InGaN/GaN double-heterojunction high-electron-mobility-transistors (DH-HEMT) is fabricated with GaN channel layer thicknesses from 6 nm to 20 nm by two-dimensional (2D) numerical simulations. A new idea for optimizating of DH-HEMT structure is proposed. The hot electron effect and self-heating ef…
Pulse electrochemical polishing (PECP) was used to improve the mechanical properties,such as surface roughness and corrosion resistance,of conductive metallic materials.PECP can provide a smooth,bright,reflective,and deburred surface that exhibits superior corrosion resistance.In this work,stainless steel was used as…
The properties of high valence difference W doped ZnO films (WZO) are investigated by means of plane wave pseudo-potential method based on the density-functional theory (DFT) and pulsed DC magnetron sputtering technique. The theoretical result shows after incorporation of W the Fermi level enters into the conduction b…
The polarization properties of electromagnetic wave have been gradually applied to the fields of communications, navigation and radar. In order to effectively control the polarization state of electromagnetic waves, a kind of metamaterial based on split-ring resonators(SRRs) is designed in this paper. The metamaterial…
We report high field magneto transport of Sm/PrFeAsO. Below spin density wave transition (TSDW), the magneto-resistance (MR) of Sm/PrFeAsO is positive and increasing with decreasing temperature. The MR of SmFeAsO is found to be 16%, whereas it is 21.5% in the case of PrFeAsO, at 2.5K under applied magnetic field of 14…
A format of f(ik,jk ) = Es (ide )2(1-(jre )2) to express cold deformed stored energy is suggested in a phase-field model for simulating recrystallization in alloys. Using AZ31 magnesium alloy as an example, the recrystallization process is simulated by the new model, and the simulation results are in good agreement wi…
The BaCo2V2O8 compound belongs to a wide group of quasi-one-dimensional (Q1D) antiferromagnets (AF) and its Co2+ ions form Q1D screw-chains along the c-axis. We here present the first investigation of the microscopic magnetic nature of a single crystalline BaCo2V2O8 sample using μ+SR. Our data reveal the presence of s…
Polysaccharides are frequently produced by microbial metabolism or lysis in fermentation broths or bioreactors. This substance often causes membrane filtration difficulty. The polysaccharide concentration effects on the microfiltration characteristics of microbial cells are discussed in this study. Yeast and dextran a…
The optimized crystal structure, energy band, density of states, and optical properties of 0.5NdAlO3-0.5CaTiO3 are calculated by the plane wave ultrasoft pseudopotential method based on the first-principles density functional theory. The optimized crystal parameters are in good agreement with the experimental ones and…
Pittosporum tetraspermumWight & Arn. belongs to the family Pittosporaceae of the order Polygal ineae. It is used for treating chronic bronchitis and as an antidote for snake poisoning. The root bark is a remedy for rheumatic swe l- ling. The bioactive principle present in the leaves of Pittosporum tetraspermum was iso…
International audience
Ge doped amorphous silicon dioxide (Ge doped silica) has attracted the attention of researchers for more than 50 years. This material is used in many different technological fields from electronics, to telecommunication, to optics. In particular, it is widely used for the production of optical fibers and linear and no…
Adopting a numerical method of solving self-consistently the Schrdinger equation and Poisson equation through taking into account the realistic heterostructure potential, which includes the influences of energy band bending and the finite thickness of barriers, and through considering the built-in electric field induc…
综述了近年来国外在生物医用钛及钛合金方面的研究与开发现状。为了取代普遍使用的Ti-6Al-4V合金,研发了多种无毒无敏感性元素、低弹性模量、高力学性能的新型β型钛合金;采用多孔技术并调节孔隙率,使材料的弹性模量与人体骨骼基本相当,通过将聚合物渗入到多孔钛的方法弥补多孔钛强度的降低,并使材料具有更好的生物相容性;为适应矫形外科领域的需求,开发了多孔TiNi超弹性形状记忆合金,从而克服了骨与植入体之间结合力弱以及弹性模量不匹配的弊端。此外,研发了多种不含毒性和过敏性元素的β型超弹性形状记忆钛合金,可以替代TiNi合金而更安全地应用于医学领域;开发了多种钛的表面改性技术,通过改性层的沉积及表面硬化使植入体的生物相容性和抗磨损性得到提高。
Интумесцентные покрытия широко используются в строительстве, так как они могут за-медлить горение и уменьшить ущерб, причиняемый огнем. Обычно при испытаниях эф-фективности таких покрытий симулируются условия медленного повышения температу-ры, как при обычном пожаре. В нашем исследовании расмотрены последствия быстрог…
Miankaleh international wetland and peninsula are one of the main UNESCO biosphere reserve in Iran and Middle East. Phytoplankton diversity of the Miankaleh wetland was investigated from October 2009 to September 2010. Apart from the work done by Ramezannejad Ghadi, this study is the second floristic study of algae in…