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。
SUMMARY Retention of ethylene glycol monoethylether (EGME) and ethylene glycol (EG), and sorption of nitrogen and water vapour, were studied on a wide range of soils from New Zealand and Fiji. EGME retention was mainly affected by the amount of EGME liquid present in the desiccator, the interaction with the desiccant…
The convex peg potential has been incorporated into a van der Waals theory of the (uniaxial) nematic to isotropic liquid crystal transition. In the convex peg model, molecules are envisioned to have a hard (here biaxial) core embedded in a spherically symmetric square well. Anisotropies in the potential are derived fr…
Abstract Die Oxidation von DyCl 2 mit Schwefel in Gegenwart von NaCl (Tantal‐Kapsel, 800°C, 7 d) liefert Einkristalle von Dy 2 S 3 im U 2 S 3 ‐Typ als Hauptprodukt. Oxidische Verunreinigungen (z. B. DyOCl) werden dabei zu Dy 2 OS 2 umgesetzt, das in zwei verschiedenen einkristallinen Formen anfällt: fast farblose Nade…
Multi‐Step Redox Systems, LV. – Crystal Structure of the CT Complex 2,5‐Me 2 ‐DCNQI/TTF from N,N′‐Dicyano‐2,5‐dimethyl‐1,4 ‐benzoquinone Diimine and Tetrathiafulvalene and of the Acceptor 2,5‐Me 2 ‐DCNQI The crystal structure of the title compound is described and discussed in terms of a neutral non‐conducting mixed‐s…
Lithium tantalate (LiTaO 3 ) thin films were deposited on sapphire-C substrates by rf magnetron sputtering at various substrate temperatures. The crystallinity was examined by X-ray diffraction and reflection high-energy electron diffraction (RHEED), and the refractive indices were determined by the prism coupling m-l…
Bonding of Cu/Cr films to several polyimides has been studied as a function of polymer surface modification by ion beam and chemical pretreatment. The effects of the metal deposition method and parameters have also been examined. The materials of interest include a low thermal expansion polyimide derived from 3,3′,4,4…
A new time-resolved fluorescence immunoassay system involving use of the europium chelate of 4,7-bis(chlorosulfophenyl)-1,10-phenanthroline-2,9-dicarboxylic acid as label is reviewed. This stable chelate by itself is not very fluorescent but, used in multiple labeling strategies, improves the achievable detection limi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of potassium copper telluride (K4Cu8Te11): a novel solid-state chalcogenide compound with a dodecahedral cluster as a building blockYounbong Park and Mercouri G. KanatzidisCite this: Chem. Mater. 1991, 3, 5, 781–783Publication Date (Print):Sept…
The Bacillus subtilis sacU locus consists of the degS and degU genes, which play a major role in controlling the production of degradative enzymes including extracellular proteases. DegS has been shown to be autophosphorylated and to transfer the phosphoryl group to DegU. In this study, we partially purified the DegS…
Canonical Van Vleck perturbation theory (CVPT) is used to calculate electric dipole intensities for one-, two-, and three-dimensional models of HCN and a six-dimensional model of H2CO. Lehmann and Smith [J. Chem. Phys. 93, 6140 (1990)] have shown that the intensities of overtone transitions are sensitive to the detail…
Abstract This paper presents the influence of fibers on crystallization kinetics and on matrix morphology for poly(phenylene sulfide)/carbon composite. The following parameters were also considered: thermal stability, fusion/crystallization conditions and surface treatment of carbon fibers. In order to correlate these…
In samples of isotactic polypropylene, the influence of the nucleation agent chinacridine permanent red E3B on the crystallization rate and content of α and β modifications and on the rate and mechanism of the β → α transition was investigated using x-ray diffraction, DSC microcalorimetry, and electron microscopy. It…
The effects of water‐soluble polymers and benzoic acid derivatives on green and sintered Al 2 0 3 compacts were studied for two types of alumina powder. The percent of theoretical density achieved by each Al 2 0 3 sediment was dependent primarily on the concentration of water‐soluble polymeric dispersant rather than o…
Ductal infiltrating carcinoma (d.i.c.) of human breast is a highly invasive neoplasm characterized by enhanced deposition of collagen. Paradoxically, enhanced collagen deposition is not correlated with inhibition of the migration of tumour cells into the host tissue. d.i.c. is characterized by the reappearance of 'emb…
Abstract The nature, crystallochemistry, organization and surface properties of soil clays derived from the most representative sedimentary formations of France are described, using qualitative and quantitative mineralogical methods and high resolution transmission microscopy (HRTEM). The main results show that soil c…
This paper describes experimental and theoretical studies of the distribution of crystal-field sites occupied by ${\mathrm{Cr}}^{3+}$ ions in silicate glasses. The effects of this site-to-site disorder on the optical band shape of $^{4}$${\mathit{T}}_{2}$${\ensuremath{\rightarrow}}^{4}$${\mathit{A}}_{2}$ and $^{2}$E${…
Abstract The crystallization behavior of poly(phenylene sulfide) (PPS) has been examined by differential scanning calorimetry as a function of melt temperature, residence time in the melt, and the presence of a liquid crystal polymer. The results suggest that the thermal history of the sample plays an important role i…
The present study analyzes high-dispersion echelle spectra of five stars located along the main sequence of M67 using the model atmospheres of Kurucz (1979). An average iron abundance of the cluster, relative to the sun, of -0.04 or - 0.12 is derived from the observed equivalent widths of up to four weak Fe II lines i…
A two‐dimensional model of a corrosion pit was developed with use of a finite‐element method which accounted for multiple species in solution, reaction equilibria, migration, and surface kinetics. The model was used to simulate the dissolution of a hemispherical corrosion pit on nickel in . Concentration profiles show…
Abstract The objective of this investigation was to determine the elemental composition and mineralogy of the smectitic and illitic phases in interstratified smectite‐illite from a typical upper Midwestern agricultural soil. A sample of soil clay (<2‐µm fraction) from the Ap horizon of a Webster (fine‐loamy, mixed,…