Materials Literature
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We have studied the structure of a side chain cholesteric macromolecule by transmission electron microscopy. Up to now, the structure of cholesteric polymers has usually been studied by optical microscopy, and sometimes by scanning electron microscopy, but rarely by transmission electron microscopy, because of the dif…
PURPOSE: To assess the effectiveness and safety of normal and high doses of Gadobutrol versus a standard dose of Gadolinium DTPA in the MR evaluation of patients with brain metastases. MATERIAL AND METHODS: In a clinical phase-II study 20 patients who had been diagnosed as having brain metastases with CT or MRT were s…
Microporous carbons have been prepared by thermal treatment of poly (4-styrenesulfonate) derivative of MgAl hydrotalcites and subsequently the carbons extracted from the matrix. The interlayer carbonization process and the characteristics of the carbonaceous materials were studied by X-ray diffraction, inverse gas ch…
Landau-Devonshire theory1 is a useful phenomenological model to describe the properties of ferroelectric phase transitions. Below the transition temperature, the Landau model can be generalized to describe the thermodynamic stability of a ferroelectric crystallite in a bistable polarized configuration, and to predict…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew Metal Carbonyl Complexes of Mixed Group 15/16 Anions: Structural Characterization of [Fe(As3Se3)2(CO)]2-, [Mn(As3Se5)(CO)3]2-, and [Fe2(AsTe4)2(CO)4]2-Thomas M. Martin, Paul T. Wood, George L. Schimek, William T. Pennington, and Joseph W. KolisCite this: Inorg. Chem. 199…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of Novel Porphyrin-Uridine Carbon-Carbon ConjugatesMara Cornia, Simona Binacchi, Tatiana Del Soldato, Franca Zanardi, and Giovanni CasiraghiCite this: J. Org. Chem. 1995, 60, 16, 4964–4965Publication Date (Print):August 1, 1995Publication History Published online1…
The stored energy, microhardness and recrystallization temperature have been measured as a function of depth for rolled polycrystalline copper at three strains and it has been shown that: the stored energy of cold work decreases from the surface to the center; the surface has a greater stored energy per unit strain an…
A general discussion of the temperature dependence of the magnetic anisotropy of single-ion origin is given based on the connection between the experimentally measured anisotropy constants and the theoretically more fundamental anisotropy coefficients. The cases of uniaxial and cubic crystal symmetry are considered in…
Abstract The computer aided design approach used in current applications of semicrystalline polyoxymethylene (POM) requires high strain‐rate mechanical data. The primary aim of this work has been to measure the room temperature modulus and tensile strength of injection molded samples of POM of different molecular weig…
A nonlinear viscoelastic model has been proposed to describe the time-dependent deformation behavior of a fiber assembly including braided fiber seals. The model is based on the standard solid model, but modified to contain three nonlinear spring and damper elements. For a fiber assembly under a compressive load, the…
The air interlacing technique is used to introduce intermittent nips to a flat filament yam so as to improve its performance in further textile processing. Observation of the interlaced flat yam nips reveals that their structure is very complicated and can be categorized into four classes: twist, braid, wrap, and enta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTwo Crystal Structures Featuring the Tetraperoxovanadate(V) Anion and a Brief Reinvestigation of Peroxovanadate Equilibria in Neutral and Basic SolutionsTae-Jin Won, Charles L. Barnes, Elmer O. Schlemper, and Richard C. ThompsonCite this: Inorg. Chem. 1995, 34, 17, 4499–4503…
Other| August 01, 1995 Experimentally determined activity-composition relations for Ca-rich scapolite in the system CaAl2Si2O8-NaAlSi3O8-CaCO3 at 7 kbar Judy Baker; Judy Baker Cambridge University, Department of Earth Sciences, Cambridge, United Kingdom Search for other works by this author on: GSW Google Scholar R. C…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEntanglement Effects in Semiflexible Polymer Solutions. 1. Zero-Shear Viscosity of Poly(n-hexyl isocyanate) SolutionsAtsuyuki Ohshima, Hiroyuki Kudo, Takahiro Sato, and Akio TeramotoCite this: Macromolecules 1995, 28, 18, 6095–6099Publication Date (Print):August 1, 1995Publi…
Evolution of He bubbles in Au has been followed with in situ electron microscopy during 400 keV Ar ion irradiation at 500 K. He bubbles were produced by implantation at 500 K of 3 keV He ions into prethinned Au samples that were then annealed to 670 K. During Ar irradiation, bubbles undergo athermal migration, coalesc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis of the absorption and magnetic circular dichroism spectra of low spin (S = 1/2) iron(III) phthalocyanineEdward A. Ough and Martin J. StillmanCite this: Inorg. Chem. 1995, 34, 17, 4317–4325Publication Date (Print):August 1, 1995Publication History Published online1 M…
BACKGROUND: Synchrotron radiation sources have made impressive contributions to macromolecular crystallography. The delay in development of appropriate X-ray detectors has, however, been a significant limitation to their efficient use. New technologies, based on charge-coupled devices (CCDs), provide capabilities for…
Abstract High resolution fluorine‐19 NMR spectra of polyfluoroaromatic compounds dissolved in deuterated dimethyl sulphoxide were measured and substituent shielding parameters were derived. These parameters were compared with the values observed in deuterated chloroform solutions and used to identify fluoroaromatic co…
A composite of titanium aluminide, reinforced with ZrO2 toughened Al2O3 fibers, has been produced by pressure casting. The stability of the microstructure during vacuum and air annealing was investigated by scanning and transmission electron microscopy (TEM). Processing resulted in partial dissolution of ZrO2 of the f…
Laser pyrolysis offers a means of extending solid free‐form fabrication to polymeric precursors. Laser pyrolysis of polycarbosilane (PCS) produces controlled β‐SiC shapes with nanometer grain size although properties are currently limited by high porosity. By the addition of filler powders, either inert or reactive, c…