Materials Literature
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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…
Non-magnetic materials of bismuth and zinc were deposited on glass and copper plates used as a substrate under a high magnetic field of 12 T . The substrate was set in perpendicular or parallel to the magnetic field direction at the position of the maximum magnetic field intensity. In the case with the glass substrate…
This work presents a new plasma treatment for the adhesion enhancement of a plasma deposited silica layer to polycarbonate. After initial oxygen plasma treatment of the polycarbonate surface, a thin hydrogenated amorphous carbon layer is deposited before the silica layer. This interlayer is found to increase the numbe…
Second-Harmonic Scattering (SHS) of light by laminar ferroelectric domains of the low temperature phase of RbH 2 PO 4 is reported. CCD images of the far-field SHS pattern reveal up to six-off axis intensity maxima normal to the ferroelectric axis. These maxima are identified from the quasi-phase matching conditions wi…
The processes of multiplication of electronic excitations (MEE), connected with the creation of secondary excitons or electron-hole (e-h) pairs by hot conduction electrons, are realized in wide-gap metal halides and oxides. In oxides, secondary e-h pairs can be also formed by 27-40 v eV photons due to L 1 VV Auger tra…
The Experimental Breeder Reactor - II (EBR-II) at Argonne National Laboratory - West (ANL-W) was shutdown in September 1994 as mandated by the United States Department of Energy. Located in eastern Idaho, this sodium-cooled reactor had been in service since 1964, and was a test facility for fuels development, material…
A simplified system for measuring time-resolved photoluminescence (PL) induced by UV laser pulses (lambda = 337 nm) is designed by a combination of a commercial PL reader and a digital oscilloscope. Using this system, PL emissions after pulsed UV excitation from a chip of sapphire (Al2O3) are successfully measured wit…
Pre-treatment procedures for the analysis of trace sulfur amounts in high-purity iron are investigated. The sulfur content of metal samples has been determined with an infrared absorption method after combustion by high-frequency induction. An analytical sample with a tungsten–tin mixture as reaction accelerator in a…
A poly(ester imide) (PEI) in the smectic crystalline (SE) state exhibits both a medium-angle X-ray scattering (MAXS) peak and discrete small-angle X-ray scattering (SAXS). Based on quantitative analysis of absolute scattering data the observed SAXS is attributed to the formation of a sandwich structure in which a cent…
The first example of a wholly aromatic rod-like macrocyclic mesogen has been synthesized by a two step polycondensation of catechol (C) with of 4,4′-biphenyldicarboxylic acid (B). Pure crystalline [2+2] cyclo-dimer was isolated from the polymerization mixture in 25% yield by a single silica gel column chromatogram and…
On the Raman scattering data for mixed crystals Sn 2 P 2 (Se x S 1 m x ) 6 additional bands with intensity maximum lying at the center, or at the sulphide and selenide ends of the concentration interval are related to the internal vibrations of various anion impurity configurations. Intensity of additional bands is pr…
The textile industry lacks an objective approach for determining the level of comfort and amount of free movement in narrow skirts. My research focused on developing a model for predicting the level of comfort and movement of narrow skirts sewn according to the fabric mechanical property of the Fabric Assurance by Sim…
Base hydrolysis kinetics of chloropentaaminecobalt(III) complexes of a range of acyclic and cyclic pentaamine ligands, incorporating the rigid -NH-CH 2 -C(CH 3 )(NH 2 )-CH 2 -NH- motif, which must coordinate facially in octahedral complexes, are analysed in terms of ground state structural influences on hydrolysis rat…
A demand to increase current density of ULSI interconnections with shrinkage of feature sizes inevitably brings about temperature rise due to Joule heating. We studied how temperature distribution changes with an increase in the current density and further investigated its effect on electromigration-induced failures.…