Materials Literature
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Eind 19e eeuw werd in Nederland de laatste wolf (Canis lupus) geschoten en in de 20ste eeuw was de wolf in bijna geheel Europa uitgeroeid. Vanaf het einde van de 20ste eeuw is de wolf echter bezig aan een opmars vanuit de resterende brongebieden in onder andere Spanje, Italie, Griekenland, de Balkan en verder noordeli…
We investigate via Monte Carlo numerical simulations and theoretical considerations the outflux of random walkers moving in an interval bounded by an interface exhibiting channels (pores, doors) which undergo an open/close cycle according to a periodic schedule. We examine the onset of a limiting boundary behavior cha…
The transmission characteristics of radiation in the near-infrared range through fabric and similar materials have been investigated, to determine the manner in which the spatial distribution and amplitude levels of the through-transmitted signals are affected by the various physical characteristics of the sample mate…
Poly(oxazolines) have emerged as a viable alternative to poly(ethyleneglycol), as a polymer coating for therapeutic applications. In this chapter, we will outline some of the key features of poly(oxazoline), its synthesis and its use as a hydrophilic segment of an amphiphilic block copolymer. Both macrointiation based…
A simulation model by utilizing RELAP5 was established for the external reactor vessel cooling(ERVC) system to investigate the effects of various thermal-hydraulic parameters such as containment pressure,subcooling,heating power and flooding water levels under the condition of cavity flooding balance on two-phase natu…
在航天器碰撞预警工作中, 为节省计算时间, 需要从大量空间目标中筛选出 可能的危险目标, 计算碰撞概率等参量并进行风险评估. 通常采用的筛选方 法包括高度筛选、几何筛选和时间筛选三步, 不同文献中后两步筛选的算 法略有不同, 同时各方法均难以实现预报三天的快速碰撞预警. 本文通过充 分考虑一阶摄动项对目标轨道的影响, 改进了时间筛选算法, 并在其后增加 了距离筛选, 将筛除比例从通常的大约99%提高到99.97%, 为实现快速碰 撞预警工作提供了理论支持. 通过对实测数据的计算比较, 验证了方 法的正确性及高效性.
Menthol extract(93.5%)was selected as the research object,and the purity of menthol crystals that formed in three kinds of solvents(acetic acid-water,ethanol-water and acetonitrile)in the electromagnetic field was detected by gas chromatography-mass spectrometer.The results showed that crystallization velocity of ment…
The ab initio fragment molecular orbital-based molecular dynamics (FMO-MD) method was extended for simulation of solvated polypeptides by the introduction of an algorithm named dynamic fragmentation with static fragments (DF/SF). In FMO-MD, the force acting on each nucleus is calculated by the FMO method, which requir…
Recently, the demand for low carbon free-cutting steel that contains no lead has increased. However, no lead steel occasionally produces built-up edge (BUE) that makes machined surface worse during cutting. Therefore, the control of the BUE particularly becomes the important problem to be solved in case of cutting the…
2013 г. июль -август т. 68, вып. 4 (412) УСПЕХИ МАТЕМАТИЧЕСКИХ НАУК УДК 519.2 Точность сильной гауссовской аппроксимации для сумм независимых случайных векторов А. Ю. Зайцев В статье дан обзор недавних результатов о точности сильной гауссовской аппроксимации для сумм независимых случайных векторов.В них содержатся мно…
Liquid-phase dehydration of glycerol to acrolein over nanosized niobia-supported silicotungstic acid catalysts was performed to investigate the effect of the silicotungstic acid loading on the catalytic performance of the catalysts. The catalysts were prepared by following an impregnation method with different HSiW lo…
To enhance the acidity of cobalt oxide, sulfation was carried out using aqueous solution of cobalt sulfate impregnated on cobalt oxide and the product calcined at high temperatures. Conventional sulfation of oxides by sulfuric acid could not avoid dissolution of cobalt oxide in the sulfuric acid. The activity of cobal…
Zn-Ni composite electrodeposition was performed under coulostatic (515-5145C・m–2) and galvanostatic (5A・m–2) conditions on a brass with Ni precoating in an unagitated chloride solution at 23°C to investigate the color and structure of the deposited films. The chromaticity of deposited Zn-Ni composite films changed in…
Laser Thomson scattering (LTS) has been applied to arc discharges generated in the atmospheric air to measure electron density (ne) and electron temperature (Te). As electrode materials, tungsten and tungsten-copper (30%) were used. The electrode gap was 0.8mm and its diameter was 1mm. The applied voltage was 6kV, the…
Cost reduction is the main driver in the recent transition to Cu wire bonding from predominate Au wire bonding. Other cost reduction in packaging comes from new developments in substrates and lead frames, for example, Pre-Plated Frames (PPF) and uPPF for QFP and QFN reduce the plating and material cost. However, 2nd b…
Axisymmetric compression tests on solid composite (LM6/SiCp) cylinders under various lubrication conditions and aspect ratio (height/diameter), suggest that the resulting curvatures of the barrels formed fit closely to circular arcs, the radii of which follow a power law with respect to the true axial compressive stre…
We present new Si to Si, SiO2 to SiO2 bonding technologies for low temperature applications (<200°C). Direct bonding process between Si (or SiO2) substrates makes high bonding strength without contamination problems. However, high temperature over 1000°C is needed for the reliable Si to Si and SiO2 to SiO2 direct bond…
This research presents the energy consumption analysis in a drying process of particleboards using a Combined Multi-Feed Microwave-Convective Air and Continuous Belt System (CMCB). The construction of this system consists of twelve magnetrons. The of materials are: particleboards, made from contained durian fiber, dur…
SnO2-CuO nanocomposites have been synthesized with the simple co-precipitation method for gas sensing properties. Sn and CuO powder were the starting materials. The synthesized products were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that SnO2-CuO nanocomposites ha…
Abstract : The objective of the paper was to study the mechanical properties like Ultimate Tensile Strength and Young's modulus are found for the developed composites of different weight % of Graphite and SiC in Al alloy. The composites were prepared by pressure die casting technique and the specimens were subjected…