Materials Literature
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We investigate the coupling of the collective modes of a coexistent incommensurate charge-density-wave (CDW) superconductor (SC). We use a gauge-invariant random-phase approximation that correctly includes screening to treat both the amplitude and phase modes of the coupled system. Unlike previous work, the SC and CDW…
Abstract Wide‐angle x‐ray line broadening methods have been used to determine the crystallite size and degree of distortion for the crystalline hard domains in MDI/diol polyurethane elastomers. Crystallite widths have been determined from the integral breadths of the 00 l reflections following correction for distortio…
Kinetics of water-soluble contrast media in the central nervous systemMR SageAudio Available | Share
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure of metalloporphyrins. 2. Experimental electron density distribution of (meso-tetraphenylporphinato)iron(III) methoxideClaude Lecomte, Dana L. Chadwick, Philip Coppens, and Edwin D. StevensCite this: Inorg. Chem. 1983, 22, 21, 2982–2992Publication Date (P…
The temperature dependence of dielectric permittivities, shear moduli and internal friction of LiCsSO4 crystals were measured. Large anomalies were found in G1 and G2 shear moduli and in the internal friction Q-1 for the samples in a and b directions, near the Curie point Tc = 202 K. The temperature dependence of stre…
The oxygen potentials at 1,000 and 1,300°C and the lattice parameters of UO2 fuels with soluble fission product elements (Zr, Ce, Pr, Nd, Y), simulating high burnup of up to 10a,o have been measured by means of thermogravimetry and X-ray diffraction. The oxygen potentials for (U, FP)O2+x fuels are higher than pure UO2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModels for nitrite reductases. Redox chemistry of iron-nitrosyl porphyrins, chlorins, and isobacteriochlorins and .pi. cation radicals of cobalt-nitrosyl isobacteriochlorinsEtsuko Fujita and Jack FajerCite this: J. Am. Chem. Soc. 1983, 105, 22, 6743–6745Publication Date (Pri…
Computer simulation of high energy primary electron scattering and subsequent generation of ‘‘fast’’ secondary electrons in thin film targets is demonstrated with Monte Carlo techniques. A hybrid Monte Carlo model is utilized to calculate the generation and subsequent spatial trajectory of each secondary electron in t…
A sequence of edge defined techniques has been developed which allows the successive multiplication of the number of lines in a grating pattern. Holographic lithography at 351.4 nm wavelength in a liquid medium has been used as the primary pattern generation technique for producing gratings with periods of ≊160 nm. A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh resolution electron energy loss vibrational studies of carbon monoxide coordination to the (10.hivin.10) surface of zinc oxideK. L. D'Amico, F. R. McFeely, and Edward I. SolomonCite this: J. Am. Chem. Soc. 1983, 105, 21, 6380–6383Publication Date (Print):October 1, 1983…
Abstract Polyesteramide polyols have been synthesized by melt condenstion using a mixture of alkanolamines, polyethylene glycols, and dicarboxylic acids/anhydrieds, and the behavior or resin samples as interfacrial agents in unidirectional as well as random composites of jute/epoxy and jute/polyester has been evaluate…
An axisymmetric liquid bridge is subjected to an axial temperature difference. Thermal variations in surface tension drive a motion that is described using lubrication theory for slender bridges. At leading order in aspect ratio, a class of similarity solutions is obtained valid in the core region away from the endwal…
PTC materials with the nominal composition (Ba 0.997 La 0.003 ) (Ti 1.012 Mn0. 0005 )O 3.025 were prepared from reagent‐grade barium carbonate and commercial grades of anatase and rutile. Both forms of TiO 2 had approximately the same crystallite size. The solid state reaction was followed by thermal analysis and by X…
The phase separation of a mesogen-nonmesogen mixture was studied with particular emphasis on the effects of boundary conditions imposed at container walls such as rubbed polyvinylalcohol (PVA) film, obliquely evaporated SiO film, free surface, etc. Microscopic observations revealed that the equilibrium shapes of a nem…
Results indicating the extent to which flow in a miscible polymer blend can displace the phase separation temperature are reported. Data were obtained on the system, polystyrene/poly (vinyl methyl ether), in the temperature ranges where it undergoes exsolution upon heating. The theoretical framework for the observed f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActive sites for hydrogen adsorption on magnesium oxideTomoyasu Ito, Masamichi Kuramoto, Minoru Yoshioka, and Taneki TokudaCite this: J. Phys. Chem. 1983, 87, 22, 4411–4416Publication Date (Print):October 1, 1983Publication History Published online1 May 2002Published inissue…
The elastic fibers in the skin and other organs can be affected in several disease processes. In this study, we have developed morphometric techniques that allow accurate quantitation of the elastic fibers in punch biopsy specimens of skin. In this procedure, the elastic fibers, visualized by elastin-specific stains,…
A new method for preparing fused silica and high‐silica glasses through the sougel process is described. Ordinarily, fused silica is formed by fusion of silica at 1900° to 2000°C. The method described consists of preparation of a porous body by mixing colloidal silica with water, drying, redispersion, molding by casti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHost-guest complexes of 18-crown-6 with neutral molecules possessing the structure element XH2 (X = oxygen, nitrogen, or carbon)A. Elbasyouny, H. J. Bruegge, K. Von Deuten, M. Dickel, A. Knochel, K. U. Koch, J. Kopf, D. Melzer, and G. RudolphCite this: J. Am. Chem. Soc. 1983…
A unified treatment has been constructed which gives a perspective view of incommensurate(IC)-commensurate(C) phase transition schemes in A 2 BX 4 type crystals. We have shown that a microscopic treatment based on `Extended Antiferroelectric Interaction Ising' model can explain most of the observed features of IC-C ph…