Materials Literature
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Three zirconium alloys (Zry-4, Zry-2, and NDA) were corrosion tested at 633 K in pure water and in mixed gas of Ar and oxygen. In both environments, their corrosion rate showed cyclic changes. The time and the weight gain at the transition point changed with their corrosion resistance. In the pure water corrosion test…
学习电解集中的效果， bioactive 在 Ti6Al4V 合金的表面上包含 Ca 和 P 的陶器的电影被微弧的氧化(毛) 在不同集中的水的答案准备。作文，微形态学，这些电影的 wettability 和他们在汉克的 SBF 的腐蚀行为被学习。我们的试验性的结果证明这部电影主要由锐钛矿，金红石和非结晶的阶段组成。随电解集中的增加，在电影的金红石的比率扩大并且钙磷酸盐的小数量(Ca3 (PO4 ) 2 ) 并且 hydroxyapatite (哈) 出现。在电影的 micropores 的数字增加但是他们的尺寸减少和他们的孔稍微增加。作为有集中的毛电影增加的表面粗糙，氧化物电影的 wettablility 不断地改善，当时微坚硬起…
SmFeAsO1−xFx was irradiated in a fission reactor by a fast (E> 0.1 MeV) neutron fluence of 4 × 1021 m−2. The introduced defects increased the normal state resistivity due to a reduction in the mean free path of the charge carriers. This leads to an enhancement of the upper critical field at low temperatures. Th…
The inhibiting action of sinapinic and gentisic acid on Al-0.8Mg alloy in 0.5 mol dm-3 NaCl solution was studied using potentiodynamic polarization method, linear polarization method, and electrochemical impedance spectroscopy measurements. Investigations were performed on a rotating disc electrode in a quiescent solu…
New methacrylic monomers containing pendant azobenzene structures have been prepared by reacting azobenzene assemblies possessing phenolic functions with methacryloyl chloride. The most favorable synthetic routes are described together with the yields obtained. The new monomers have been purified and completely charac…
The magnetic resonance of various split ring resonators (SRRs) is numerically investigated to analyze the dependence of the resonance frequency on their parameter designs. The behavior of the magnetic resonance frequency in the configuration of the 2-cut singlering SRR (2C-SRR) shows a larger shift in relation to the…
This paper presents how metamaterials can be used to enhance antenna bandwidth. To this purpose, a particular metamaterial cell is introduced for which its design parameters are detailed. This cell is then used to enhance the performances of a microstrip antenna which can be found in communication systems.
The electrochemical injection of holes into the valence band of mercaptopropionic acid stabilised CdTe quantum dots in aqueous solution was investigated employing a glassy carbon rotating disc electrode. Analysis of the first exciton peak and the electrochemical responses as a function of the particle size was perform…
ZnO thin films were prepared on a quartz substrate by sol-gel method and a UV photodetector was constructed on the ZnO thin films, with a circular spiral structure in contact with 30 nm IrO2 electrodes. The ZnO thin films were crystallized at various crystallized temperature (600∼700°C) for 1 hour in pure oxygen atmos…
The aqueous extract of Cassia auriculata leaves (Awali), Erythrina variegate leaves (Pangora) and Dioscorea bulbifera bulbs(Kand) were investigated for their anthelmintic potential against earthworms (Eicinia faeteda), tapeworms(Raillietina spiralis) and roundworms(Ascardia galli). Various concentrations (10-50 mg/ml)…
C. Hin,1,2 B. D. Wirth,1 and J. B. Neaton3 1Department of Nuclear Engineering, University of California, Berkeley, California 94720-1730, USA 2Department of Materials Sciences and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA 3Molecular Foundry, Lawrence Berkeley National…
We investigated the effects of particle concentration and an additive amount of a dispersant on the adsorption behavior of dispersant. Ammonium polycarboxylate, one of the typical polyelectrolyte was used as a dispersant in this study. Alumina slurries were prepared by changing the concentrations of both the particle…
The ternary rare-earth vanadium germanides REVGe3 (RE = La–Nd) have been synthesized by arc-melting and annealing at 800 °C for 3 weeks. Their crystal structures were determined by powder X-ray diffraction and refined by the Rietveld method. The hexagonal cell parameters are a = 6.2587(3)–6.2145(2) Å and c = 5.6992(3)…
The objective of the present work is to develop a procedure for obtaining and characterizing active blue silica from rice husk ash. About 25 wt.% silica powder (from total mass of rice husk) of 95% pure silica could be produced after heat-treating at 700°C for 6 hours. A simple method based on alkaline extraction foll…
Interactions of titanium dioxide nanotubes (TiO2NTs) with positively (AuNP+s) and negatively charged (AuNP−s) gold nanoparticles have been investigated using a combination of UV-Vis spectroscopy, ζ potential and transmission electron microscopy analyses. Possessing a negatively charged surface, TiO2NTs show no attract…
The present investigation aims to demonstrate the potentiality of Ca 3 Y 2 Si 3 O 12 doped with Ce 3 + and Tb 3 + along with Tb 3 + and Ce 3 + co-doped phosphors, which are prepared by a sol–gel method. Photoluminescence (PL) spectra revealed a brighter and broader violet-blue emission from the Ce 3 + [ 5 d ( D 2 ) →…
Current Science
First-principles calculations support the hypothesis that the appropriate spacing between Pd monomers controls the catalytic activity of Pd/Au catalysts in the vinyl acetate formation only if a vinyl surface species is involved in the rate-determining step of the reaction, opening new questions on these relevant catal…
The optical properties of the sandwich of Ag nanorod array (NRA)/structured dielectric layer/Ag mirror have been investigated theoretically and experimentally, where the structured dielectric layer has stacked sublayers of an anisotropic nanocolumnar layer and a uniform layer. The functions of the nanocolumnar and the…
External stresses alter the magnetic properties of ferromagnetic materials such as iron and steel, a fact that has been the basis of substantial study in nondestructive testing. Existing theories and models have so far not proven reliable or accurate enough to develop a practical means of using the developed theory re…