Materials Literature
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With the combination of redox reaction and co-precipitation, a series of Sn-Fe-Cr composite metal oxide catalysts with various compositions were prepared, which exhibit higher specific surface areas, thermal stability and CH
An integrated method for power plant analysis, including rotating component matching and CFD simulation of the combustion process, is applied to the study of gas turbines supplied with hydrogenated fuels originating from the natural gas reforming. The method proposed by the authors allows estimation of the power plant…
As dicarboxylate complexes of transition metal possess potentially useful electronic and magnetic properties, [Mehrotra and Bohra (1983). Metal Carboxylates. Academic Press, London], much interest in their synthesis and structure has been apparent recently [Kaneko and Tsuchida (1981). J. Polymer Sci . , Macromolecular…
High temperature deformation and fracture of the Al–Mg–Mn sheet consisting with the coarse-grained surface and the fine-grained center layers have been investigated. Such a microstructure was produced by the continuous cyclic bending (CCB) and the subsequent annealing. The elongation to failure has a peak value at 713…
The objective of the present work is to determine the local crystal growth rate in an imperfectly mixed suspension crystallizer. Experiments were carried out in pure potassium sulphate-water solution. The steady-state Crystal Size Distributions (CSDs) were measured at four different heights of the crystallizer using a…
For quantitative analysis by AES and XPS, it is important to test the theory and to use the correct sensitivity factors. We develop our previous analyses of peak area intensities for elemental spectra in digital Auger and X-ray photoelectron databases measured using a fully calibrated spectrometer. The intensities, in…
A large diameter high strength titanium free-hanging catenary riser was evaluated by the Demo 2000 Ti-Rise project, from initiative of the Kristin Field development license. In order to reduce the uncertainties related to the schedule, cost, and special technical issues identified in the work related to a similar rise…
In this study, it was shown that the degree of effectiveness produced by halogenation with trichloroisocyanuric acid (TCI) was influenced by previous methyl ethyl ketone (MEK) wiping of a synthetic vulcanized styrene-butadiene rubber (R2) surface. The MEK wiping of the R2 rubber surface prior to chlorination with TCI…
The core loss of conventional MnZn ferrite varies with temperature. Therefore, for use in a trans-former, the main composition must be chosen so that the loss is lowest between 80°C and 100°C. Substitution of Co for Fe in an MnO-ZnO-Fe2O3 ternary system gives a smaller variation in loss with temperature. The gradient…
A new family of phosphorus-based chiral liquid crystals is described. Dibenzophosphole oxides containing an asymmetric center at the phosphorus atom show cholesteric and smectic liquid crystalline behavior. The presence of the chiral center in the rigid heterocyclic core avoids the need for destabilizing chiral alipha…
Films of polypyrrole/κ-carrageenan have been deposited on platinum electrodes by electrochemical oxidation of pyrrole in water solutions containing either sodium or potassium κ-carrageenan polyanions. The deposition of the films was carried out by multicycling the potential between and 0.8 V vs. saturated calomel elec…
Ante la necesidad de desarrollar alternativas tecnologicas que permitan la utilizacion de elementos desechados en procesos productivos para aprovechar su potencial y contribuir a la disminucion del impacto ambiental que puedan generar por una inadecuada disposicion, surge la oportunidad de aprovechar productos vegetal…
The effects of thermal cycling on martensite transformation in Cu-11. 9Al-2.5Mn(mass fraction, % ) shape memory alloy(SMA) with high Ms temperature were studied by means of electrical tension vs temperature (U-T) measurement, optical microscopy observation and X-ray diffractometry. It shows that with increasing therma…
摘要 在平均场理论基础上,研究了具有DzyaloshinskiiMoriya(缩写为DM)相互作用的二维spinPeierls模型以及DM相互作用对二聚化的影响.研究表明,随模型参量的不同,DM相互作用能加强或削弱二聚化位移.另外,发现DM相互作用对二聚化位移的依赖程度参量λ存在一个特殊点λc,当λ=λc时,DM相互作用对二聚化没有影响.随晶格弹性系数的增加,λc将增大,而链间耦合将使λc减小 关键词: 二维spinPeierls模型 DM相互作用 Abstract Keywords: 作者及机构信息 殳蕾, 陈宇光, 陈鸿 1. 同济大学波尔固体物理研究所,上海200092 基金项目: 国家杰出青年科学基金 (批准号 :1972…
Hysteresis Effects in Capillary Pressure, Relative Permeability and Resistivity Index of North Sea Chalk : SCA 2001-65, International Symposium of the Society of Core Analysts, Edinburgh, 17-19 September 2001
Polymeric materials are successfully used in virtually all industries ranging from semiconductors, and coatings, to household appliances, automotive, and biomedical implants. Polymers generally have excellent bulk physical and chemical properties. However, certain properties of polymers such as low surface energy, low…
Using the effective mass approach, Tauc's relation for the absorption coefficient is reinvestigated. Two different forms for the dependence of the absorption coefficient f on the photon energy \hbar y are derived. The proportionality constants in both the relations are calculated theoretically using the appropriate ef…
Maria Del Pilar Ponce-Jiménez, Fernando A. López-Dellamary Toral, Humberto Gutierrez-Pulido, Antifungal Protection and Sizing of Paper with Chitosan Salts and Cellulose Ethers. Part 2, Antifungal Effects, Journal of the American Institute for Conservation, Vol. 41, No. 3 (Autumn - Winter, 2002), pp. 255-268
We analyze folding phenomena in finely layered viscoelastic rock. Fine is meant in the sense that the thickness of each layer is considerably smaller than characteristic structural dimensions. For this purpose we derive constitutive relations and apply a computational simulation scheme (a finite-element based particle…
Chemically reactive impurities such as oxygen and fluorine alter the diffusion and activation kinetics of boron during the anneal process. An examination of the role these impurities play during the anneal process indicates important differences between microwave and lamp-based rapid thermal processing (RTP) for low e…