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。
Structural phase transitions between various kinds of superlattice structures formed on a Si(111) surface have been investigated by spot analysis of reflection high-energy electron diffraction (RHEED). Reversible transitions induced by temperature changes and irreversible ones induced by metal depositions were observe…
Abstract The frequency dependence of dielectric constant ϵ′, dielectric loss ϵ″, and dielectric anisotropy were determined for poly(vinylidene fluoride) (PVDF) in microwave frequencies from 4 to 13 GHz. The ϵ′ and ϵ″ for PVDF films decreased with increasing frequency. Both ϵ′ and ϵ″ were larger in the transverse direc…
Abstract This paper presents a 27 Al and 29 Si MAS NMR study of K-feldspars and demonstrates that the spectra are sensitive to variations in the state of Al,Si order. For synthetically annealed samples, the results are in agreement with previous IR spectroscopy (Harris et al. , 1989) and demonstrate that Al,Si rearran…
Abstract— The fracture behaviour of high strength steels under the influence of hydrogen was studied, with special emphasis on the critical condition for the formation of intergranular (IG) cracks. Mechanical tests were carried out on cathodically charged specimens subjected to both a constant load and a constant disp…
Abstract The chlorite data presented are from four igneous complexes covering the compositional spectrum of igneous rocks (gabbro to granite) of orogenic and anorogenic settings. The four igneous complexes are; early orogenic gabbro-diorite-tonalite (D-T) suite, late orogenic granodiorite-adamellite (G-A) suite (both…
By considering the classical Oregonator model, the effect of the main reactants, i.e., bromate and malonic acid, on the behavior of the Belousov-Zhabotinskii system is studied. This analysis is a prerequisite for the understanding of the occurrence and disappearance of oscillations in batch reactors. A parametric anal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe New Orthosilicate Li4SrCa(SiO4)2: Structure and Eu2+ LuminescenceAnnapoorna Akella and Douglas A. KeszlerCite this: Inorg. Chem. 1995, 34, 6, 1308–1310Publication Date (Print):March 1, 1995Publication History Published online1 May 2002Published inissue 1 March 1995https:…
Di-sodiumhydrogenphosphate (DSHP) inhibits the stress corrosion cracking (SCC) of α-brass in 0.1 M NaNO 2 . It increases the maximum stress and the time to failure at failure in slow strain-rate tests. It also changes the mode of failure to ductile failure in the presence of moderate concentrations. The results are co…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and Degree of Charge Transfer of Simple and Complex Cyanine-TCNQ Anion Radical Salts Studied by Resonance Raman and Infrared SpectroscopyShin-ichi Terashita, Kazumi Nakatsu, Yukihiro Ozaki, and Seishi TakagiCite this: J. Phys. Chem. 1995, 99, 11, 3618–3628Publicati…
The effect of the addition of sulfate ions (SO42–) on corrosion inhibition of Aluminum Association (AA) 7075 aluminum (Al) alloy (UNS A97075) in aqueous solution was studied. Corrosion behavior was affected significantly by the addition of SO42–. The corrosion morphology and corrosion rate changed with various thermom…
What is the order of the nematic--smectic-A (NA) transition? The answer to this question has flip-flopped over the years as ever more sophisticated theories and ever more careful experiments have addressed the issue. The Landau theory predicts that the transition can be either first or second order, depending on mater…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTShear-Induced Isotropic-to-Nematic Transition in a Thermotropic Liquid-Crystalline PolymerChang Dae Han and Seung Su KimCite this: Macromolecules 1995, 28, 6, 2089–2092Publication Date (Print):March 1, 1995Publication History Published online1 May 2002Published inissue 1 Mar…
Abstract The problem of polymer adsorption on carbon black surfaces is considered within the concept of disorder-induced localization of polymer chains on disordered or fractal surfaces. The model describes how physical adsorption properties are enhanced compared to the adsorption on a flat surface. The difference is…
We present spectropolarimetric observations of the eclipsing cataclysmic variable 1H 1752+08. The spectrum shows weak Balmer emission lines typical of an AM Herculis system in a low-state of accretion. Broad, Zeeman-split absorption lines are seen at Hα and Hβ. The absorption lines are circularly polarized, but we wer…
An inclusive electron scattering experiment on 16 O and 40 Ar is presented. The ADONE electron storage ring, a clustered jet-target and a BGO calorimeter to detect electrons were used. Spectra were collected at beam energies from 0.5 up to 1.5 GeV and at laboratory scattering angles from 32 degrees to 83 degrees . The…
The HIS3+ gene of Saccharomyces cerevisiae was overexpressed in Escherichia coli and the recombinant imidazoleglycerol-phosphate dehydratase (IGPD) purified to homogeneity. Laser-desorption and electrospray m.s. indicated a molecular ion within 2 units of that expected (23833.3) on the basis of the protein sequence, w…
High‐purity (99.9%) yttrium oxide (Y 2 O 3 ) powder has been consolidated, either by vacuum sintering (VS) or by hot isostatic pressing (HIP). As the dense polycrystalline ceramics contained point defects, mainly oxygen vacancies, oxidation treatment was applied at 1500°C for 2 h. The two materials were compared with…
Abstract Foam and Foam Breaking – A Review. Many technical processes produce foams which complicate the performance of a given process or even make it possible. Foam breaking, therefore, becomes necessary. This paper outlines well known and new methods of foam breaking as well as the breaking principles. For the examp…
An investigation of adaptive hybrid composite cylinders utilizing active Shape Memory Alloy (SMA) composite layers for use in high-pressure vessel applications is presented. An analytical analysis using a linear elastic composite cylinder formulation shows that adapative SMA elements in a composite cylinder can be use…
Abstract We investigate criteria for craze failure at a crack tip and the dependence of craze failure on the molecular weight of the polymer. Our micromechanics model is based on the presence of cross‐tie fibrils in the craze microstructure. These cross‐tie fibrils give the craze some small lateral load bearing capaci…