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。
Abstract Raman scattering and calorimetric measurements are used to study the ferro‐paraelastic phase transition undergone by [N(CH 3 ) 4 ] 2 ZnBr 4 at 287.19 K. The knowledge of its vibrational spectrum, together with the available elastic and thermal expansion data, allow to obtain the specific heat of the phase tra…
The corrosion of aluminosilicate refractories by molten aluminum, such as in melting and holding furnaces, generally leads to the formation of an alumina deposit on the refractory. In the presence of alkalies and under a reducing atmosphere the extent of corrosion is increased. This could be related to the transformat…
The diatom Chaetoceros coarctatus has been studied by light (LM) and electron microscopy (SEM, TEM), from preserved plankton samples collected in the Gulf of California and off the Pacific coast of Baja California. Observations include the finding of a number of rimoportulae in a single valve (terminal or intercalary)…
The structure of friction open-end yarns made with a much modified DREF 3 friction spinning unit with replaced suction rolls and equipped with a comber roll assembly from a Platt 881 rotor spinning unit was studied and found to be dissimilar to that of ring spun yarns. Migration theory, as it is known in ring spinning…
We studied phase transitions in an antiferroelectric liquid crystal TFMHPOBC (C 8 H 17 O-&benzf;-&benzf;-COO-&benzf;- * CH(CF 3 )C 6 H 13 ) by means of dielectric measurements and microscopic observations. Both a Goldstone mode and a soft mode were observed in the SmC * phase, but only a soft mode in the S…
peer reviewed
The high-field magnetization process in the (${\mathrm{Nd}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Dy}}_{\mathit{x}}$${)}_{2}$${\mathrm{Fe}}_{14}$B system has been investigated using single crystals with x=0, 0.125, 0.2, 0.33, 0.47, 0.6, and 1. Magnetization measurements were performed using steady magnetic fi…
Abstract The synthesis of a block copolymer with polystyrene (PS) and polycarbonate (PC) segments is described. It is produced by anionic polymerization of the styrene and endcapping with a hydroxyl group followed by subsequent reaction with phosgene and bisphenol‐A. The polystyrene/polycarbonate block copolymer was u…
The Al composition of AlGaAs has been determined by four methods: high-resolution transmission electron microscopy (HRTEM), reflection high-energy electron diffraction (RHEED), photoluminescence (PL), and double-crystal x-ray diffraction (DCXRD). HRTEM is direct and the most accurate method because it does not involve…
Domain wall processes (domain wall configuration, propagation, and collapse) in magnetostrictive amorphous wires of the composition Fe/sub 77.5/Si/sub 7.5/B/sub 15/ were investigated. The wires were held under tensile stress (up to 1700 MPa in the case of as-quenched). The domain wall length and normal mobility (or da…
This paper describes an attempt at a theoretical study of large-scale tensile defor mation of plain woven fabrics. The basis of the investigation is to use a more realistic approximation of nonlinear yarn bending behavior for both the undeformed fabric state and the stress analysis than has been used by most previous…
The thermal properties of 4-cyanophenyl 4-(4-alkyloxybenzoyloxy)benzoates having a lateral substituent have been examined. Commencing with the nonyloxy homologue the hydrogen derivative shows a smectic A phase having a partially bilayered arrangement (SAAd). When the substituents are introduced at position X, the SAd…
The mixed oxidation-chlorination of iron in gas mixtures of Ar, O2, and Cl2 at 1000 K has been investigated by thermogravimetric analysis and examination of the corrosion products by optical and scanning electron microscopy and X-ray diffraction analysis. Vapor phase transport of iron chlorides influences the rate of…
Escherichia coli citrate synthase is strongly and specifically inhibited by NADH, but this inhibition can be prevented by reacting the enzyme with Ellman's reagent. We have now labeled the single reactive cysteine covalently with monobromobimane and isolated and sequenced the bimane-containing cyanogen bromide peptide…
The electrochemical behavior of a carbon fiber/vinyl ester composite in 3.5% NaCI solution was investigated. The technique chosen for the study was electrochemical impedance spectroscopy (EIS), which enables time-dependent data to be acquired nondestructively on single samples. The data from the measurement technique…
A method is proposed for calculating the internal stresses in ferroelectric and ferroelastic ceramics which is based on the modelling of the mechanical sources of stress by fictitious dislocations continuously distributed on the grain and twin boundaries. For tetragonal and orthorhombic ceramics with a lamellar twin s…
The contrast agents gadolinium-DTPA (diethylenetriaminepentaacetic acid), Gd-DOTA (tetraazacyclododecanetetraacetic acid), and Gd-HP-DO3A (1,4,7-tris[carboxymethyl]-10-[2' hydroxypropyl]-1,4,7,10-tetraazacyclododecane) are used in humans as extracellular contrast agents. Although free Gd+ ion is toxic, the intact Gd3+…
Amorphous solid D2O from hexagonal and cubic ices and H2O from (HF, NH3, and NH4F) doped hexagonal ice have been prepared by Whalley’s method, and their thermal behavior has been investigated by differential scanning calorimetry from 103 to 250 K. For a heating rate of 30 K min−1 , the temperature of the onset of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescent nitridorhenium(V) complexesGregory A. Neyhart, Kevin J. Seward, James Boaz, and B. Patrick SullivanCite this: Inorg. Chem. 1991, 30, 24, 4486–4488Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 November 1…
Abstract The phosphate mineral distribution as it relates to in situ soil solution composition of two Alfisols developed from phosphatic Ordovician limestones in the inner Bluegrass Region of Kentucky was investigated. At both sites, microcrystalline apatite appeared to be the primary source of P. Surface weathering u…