Materials Literature
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Metal oxide nanoparticles such as TiO2 (< 100 nm) are used in lotions and sunscreens. Toxicity studies so far have reported the use of TiO2 NPs with size > 100 nm as determined by dynamic light scattering (DLS) technique. We used non-reactive chemical agents such as propylene glycol (PG), glycerol (G), ethylene glycol…
J - R curves under continuous hydrogen charge were obtained to evaluate the effect of absorbed hydrogen on fracture toughness of SCM440 low alloy steel. The effect of absorbed hydrogen, loading rate and tempering temperature were investigated. Five materials which were tempered at different temperature to change Vicke…
This paper presents the results of a study carried out in order to perform a condition assessment of seven MV submarine cables operated by Hydro-Quebec Distribution (HQD). The assessment was based of the principle of dielectric loss characterization. Two methods were chosen: Time Domain Spectroscopy (TDS) and VLF Tan…
The objective of this study was to determine the effect of a nonionic silver nanocolloid administered orally for 7 or 14 d at three concentration levels (25 ppm, 2.5 ppm, and 0.25 ppm) on the phagocytic activity and mitogenic response of splenocytes, and levels of selected cytokines in the serum of NMRI mice. The phag…
a self-consistent-charge density-functional tight-binding method was employed to study the electronic and atomic structures of full hydrogenation carbon nanotues (CNTs) which are relevant to hydrogen storage and device application. Intriguing trends of the geometrics, hydrogenation energy and energy gaps of full hydro…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
This study investigates the possibility of recovering nickel from the spent catalyst (Ni/Al2O3) used in the steam reforming process of a fertilizer industry. In the leaching process, nickel is recovered as nickel nitrate using nitric acid as a solvent The effects of acid concentration, temperature, solid to liquid (S:…
The microstructures and electronic structures of nitrogen doped tetrahedral amorphous carbon (ta-C ∶N) have been simulated and investigated using molecular dynamics within the framework of density functional theory. There are no obvious relation between the coordination of nitrogen and the density of ta-C ∶N. The most…
采用共沉淀方法制备了稀土离子Eu3＋,Dy3＋,Sm3＋掺杂的Ca（Sr,Ba）WO4发光材料,目的是研究金属阳离子改变对稀土离子发光性质的影响。X射线衍射光谱数据表明,CaWO4、SrWO4、BaWO4都是四方晶系I41/a（88）结构,随着阳离子半径增大,衍射峰向小角移动。不同温度制备的BaWO4样品X射线衍射光谱数据表明,温度较低时制备的晶体样品X射线衍射峰较宽;当制备温度升高后,晶体样品X射线衍射峰宽变窄。样品的SEM照片表明,低温制备的样品晶粒尺寸较小,约为100~300 nm;高温制备样品晶粒尺寸较大,约为2~6μm。测试了Eu3＋,Dy3＋,Sm3＋掺杂的Ca（Sr,Ba）WO4发光材料的激发和发射光谱。计算了Eu3…
Using the first-principles density functional theory, we calculate the crystal structures, magnetisms and electronic structures of Sb-containing half-Heusler alloys XYSb(X=Ni, Pd, Pt; Y=Mn, Cr). The calculation results show that alloy NiMnSb is half-metal and the others are metals at equilibrium lattice constant. The…
The significance of on-site insulation diagnosis has been increasing year by year to deal with tremendous amount of aged high voltage power apparatus in utility companies. On-site diagnostic methods based on partial discharge (PD) measurement using resonant high-voltage supply are promising technique because resonant…
The method of crucible rotating oscillation damping was employed to measure the kinematic viscosity of magnesium melt and the curve of viscosity v versus temperature T from 935 K to 1190 K was obtained. It is exponential increase (decrease) law of viscosity with the temperature during heating and cooling process; Besi…
Porous silicon (PS) suitable for optical detection of immunoreaction is fabricated.The structure of immunosensor is prepared by the following steps: oxidization, silanization, glutaraldehyde cross-linker, and covalent binding of antibody.When antigen is added into the immunosensor, the Raman intensity is estimated to…
The indentation load-size effect (ISE) in Vickers hardness of Al2O3 and Al2O3 + SiC nanocomposites has been investigated using Meyer's law, the proportional specimen resistance (PSR) model and the modified proportional specimen resistance (MPSR) model. The strongest ISE was found for alumina. It is suggested that the…
Most municipal solid wastes and compostable plastics are disposed of in an anaerobic system in landfills, where compostable materials do not decompose. This high volume of municipal waste produced from cradle-to-grave processes can partially change into cradle-to-cradle processes through compositing. The objective of…
Using the generalized Ginzburg-Landau-Devonshire theory, the characteristics of phase transformation of a ferroelectric thin film with surface layers are investigated. We study the effect of the surface layer on the properties (coercive field, critical thickness) of a ferroelectric thin film. Our theoretical results s…
The properties of polyvinyl alcohol/gelatin (PVA/GE) nanofibers have been previously investigated as a function of the processing parameters such as the ra-tios of PVA and GE, electrical field and tip-to-collector distance during the electro-spinning process, in this study, the properties of the electro-spinning PVA/G…
The results of X-ray diffraction (XRD), scanning electron microscopy (SEM) and dielectric measurements performed for samples of the polycrystalline solid solutions of (Ba1-xSrx)TiO3, are presented. An increase of diffuseness of ferroelectric phase transition and a decrease of the temperature Tm (the temperature of the…
The lowest‐lying negative‐parity state of the Lambda is investigated in (2+1)‐flavour full‐QCD on the PACS‐CS configurations made available through the ILDG. We show that a variational analysis using multiple source and sink smearings can extract a state lying lower than that obtained by using a standard fixed smeared…
Glass forming materials are characterized by a complex relaxation pattern, which evolves over several time decades. Dielectric spectroscopy has proven particularly useful for studying such scenario as it is able to monitor the dielectric dynamics of a system over a range up to 16 time decades. In this work we study ef…