Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The authors develop a new efficient method for calculating the shape-truncation functions of arbitrary Voronoi polyhedra by combining analytical and numerical techniques. Applications are presented for cells of cubic symmetry as well as for hexagonal close-packed (HCP) atomic polyhedra with different values of the c/a…
The growth by pulsed-laser deposition of c-axis-oriented bismuth titanate (BTO)/YBa2Cu3O7(YBCO) superconductor heterostructures on [001]-oriented Si with epitaxial yttria-stabilized ZrO2 as a buffer layer is reported. X-ray-diffraction studies of the heterostructures show that all the layers grow in the c-axis orienta…
Reasons why chelates of rare earths (RE) do not obey the tetrad 'doublet' effect are discussed. The examination is based on the concept of an ionic metal–ligand bond in RE complexes. The mutual influence of ligands in lower, higher, polynuclear and mixed complexes formed by ligands of low, medium and high denticity is…
Abstract Brachiopods contain both proteins and lipids within the biocrystals of their shell. One intracrystalline chromoprotein causes red shell coloration, whereas the other molecules may be involved with biomineralization, may strengthen the biocrystal, or may simply have been inadvertently engulfed by calcite durin…
Steady states of driven lattice gases with open boundaries are investigated. Particles are fed into the system at one edge, travel under the action of an external field, and leave the system at the opposite edge. Two types of phase transitions involving nonanalytic changes in the density profiles and the particle numb…
The thermochemical reactivity of alkaline earth metal and transition-metal carbonates is discussed. Emphasis is given to the dependence of degradation mechanisms and the concomitant formation of solid and volatile products on temperature range, gas atmosphere, and type of energy impact. The experimental findings compr…
Introduction, Historical Highlights, and the Need for Dissolution Testing Theories of Dissolution Dissolution Testing Devices Automation in Dissolution Testing, by William A. Hanson and Albertha M. Paul Factors That Influence Dissolution Testing Interpretation of Dissolution Rate Data Techniques and of In Vivo Dissolu…
Electronic properties of the generalized Fibonacci lattices are studied using the dynamical system technique, for which the off-diagonal tight-binding model is employed. The matrix and trace maps are obtained and investigated in a unified way. It is found that the energy spectra are Cantor-like and the wavefunctions a…
Retraces of phase-matching (PM) angles and noncritical phase-matching temperatures for both type I and type II second harmonic generation in LiB3O5(LBO) are first demonstrated. By fitting to the measured PM angles at room temperature, new Sellmeier’s equations of LBO are obtained. Further analyzing the spectral and an…
We have investigated the effect of substrate topography on nucleation behavior by producing a variety of substrate features on molybdenum and silicon substrates. The initial stages of nucleation on these substrates were studied by exposing them to similar conditions in a hot filament chemical vapor deposition reactor.…
The author calculates M 2,3 (3p) absorption spectra of the first-row transition-metal ions using a localized description for the 3d n to 3p 5 3d n+1 excitation that includes 3p and 3d spin-orbit interaction and octahedral crystal-field symmetry. Each electronic or spin configuration has a distinctly different spectrum…
A parameter-free approach to phase stability in Cu-Zn substitutional alloys is shown to describe order-disorder phenomena and structural transformations with remarkable accuracy. The method is based on a multiple-scattering description of the electronic structure properties of the random alloy. Configurational order i…
Epitaxial thin films of PbZrxTi(1−x)O3 (PZT) with 0≤x≤0.6 have been deposited in situ by pulsed laser deposition from stoichiometric targets onto 〈100〉 oriented single crystals of MgO and SrTiO3. Film composition was extremely sensitive to the substrate temperature and the oxygen deposition pressure. In a high (200–30…
Abstract Thermal conductivity of polyethylene composites, filled with randomly dispersed and disoriented (oriented at random) carbon fibers with various aspect ratios, were investigated. Orientation of fibers was quantitatively evaluated by Hermans' parameter. In specimens of isotropic composites, i.e., filled with ra…
Bovine pancreatic trypsin inhibitor (BPTI) continues to be the only protein for which a detailed pathway of folding has been described. Previous studies led to the conclusion that nonnative states are well populated in the oxidative folding of BPTI. This conclusion has broadly influenced efforts to understand protein…
Ultrasonic irradiation of liquids causes acoustic cavitation: the formation, growth, and implosive collapse of bubbles. Bubble collapse during cavitation generates transient hot spots responsible for high-energy chemistry and emission of light. Determination of the temperatures reached in a cavitating bubble has remai…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Magnetic and electric properties are studied of an organic ferromagnet of pyrolysed polyacrylonitrile (PAN) and of its composites with an epoxy which are of great interest for practical use. Possible models of the pyro-PAN ferromagnetic macromolecules are presented. Unusual magnetic properties of the composites obtain…
Volume diffusion of 14C in high purity α-Fe single crystals is measured in the wide temperature range of 1168 to 596 K applying the radiotracer technique and serial sectioning of the samples. In the temperature range in which the present tracer and previous Snoek-effect measurements overlap a good agreement is found b…
Abstract The Ruddlesden-Popper structural family is constructed from ordered intergrowths of rocksalt type (AX) layers with perovskite (ABX3) blocks of varying widths, yielding phases with the general formula nABX3 AX where 1 < n < ∞ In this article, the characterization of (CaxSr1-x)n+1TinO3n+1 layer pe…