Materials Literature
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Under the conditions of x-ray photoelectron spectra (XPS) analysis organic liquids appear to behave as electrical conductors. Here we report x-ray photoelectron spectra for pentaphenylether and pentaphenyltrimethyltrisiloxane oils at room temperature. These materials are commercially available as diffusion pump fluids…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHenry's Law Constants and Gas-Solid Potential for CO2 on Graphitized Carbon BlacksE. J. Bottani, Ismail M. K. Ismail, M. J. Bojan, and W. A. SteeleCite this: Langmuir 1994, 10, 10, 3805–3808Publication Date (Print):October 1, 1994Publication History Published online1 May 200…
Abstract Fusion simulation is one of the key techniques in designing and producing electrofusion (EF) joints for gas distribution and in evaluating fusion joint integrity. This paper describes the result of a numerical simulation of a thermal fusion process, using the finite element method. A nonlinear heat transfer c…
Experiments of diffusion are more difficult in ceramics than in metals, because of specific physical, chemical and mechanical properties of ceramic materials. Due to their high melting point, the amount of point defects is generally much less than in metals at the same temperature. That implies very low diffusion coef…
New methods of determining the oxygen self‐diffusion coefficients (D* o ) in oxides have been developed using Raman spectroscopy combined with the 16 O– 18 O exchange technique. From the depth‐profiles of the 18 O concentration in the 16 O– 18 O exchanged oxides, which was measured by Raman microscope with a spatial r…
The influences of step size and scanning speed on the shape of a single X-ray diffraction (XRD) peak are analyzed quantitatively. For this purpose, it is assumed that XRD peak shapes are a mixture of Cauchy and Gauss curves. Six equations are established for the calculation of position, maximum intensity and full widt…
Calphotin is a Drosophila photoreceptor cell-specific protein expressed very early in eye development, at the time when cell-type decisions are being made. Calphotin is a very hydrophobic and proline-rich protein which lacks obvious transmembrane domains. The cDNA encoding Calphotin was mapped to a region removed by a…
Abstract A theoretical study in the Debye approximation is made of the isobaric specific heat (C P ) and thermal expansion of solids with a Bravais lattice. Analytical expressions are obtained for the variations of C P and the linear thermal expansion coefficient (x p ) with temperature. The temperature dependence of…
A series of α, α'-thiophene oligomers and their α, α'-substituted derivatives such as formyl, bromine, and cyano have been prepared in order to discuss the effects of number of thiophene rings and introduction of functional groups on third-order nonlinear optical properties. Optical absorption spectra and optical thir…
This paper is concerned with structural changes taking place in pure magnesium subjected to cold straining under heavy loading. It was shown that at T = 0.3 T[sub m] (melting point), low temperature dynamic recrystallization (LTDR) developed in the material. During LTDR, the size of dynamically recrystallized grains w…
The addition of 8.4 vol% short metal‐coated carbon fibers to an active brazing alloy increased the debonding strength of metal/ceramic joints by 18% to 28%. The carbon fibers helped to strengthen the brazing alloy and to decrease slightly the thermal stress at the brazing interface. The carbon fibers were either unifo…
A total of 51 model tests of cratering and soil loosening were conducted using small charges of pentaerythritol tetranitrate detonated at different depths of burial and different gravitational accelerations in a lunar soil simulant to model conditions on the surface of the Moon. Model crater dimensions extrapolated to…
Abstract A number of smectitic samples from Almeria (SE Spain) were studied by chemical analysis, DTA, TG, XRD (oriented aggregates with ethylene glycol treatment and Greene-Kelly test), FTIR and MAS NMR. Chemically they resembled a beidellite-montmorillonite series, displaying DTA/TG characteristics already quoted in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption and Decomposition of Methanol on NiAl(110)Bor-Ru Sheu, S. Chaturvedi, and D. R. StronginCite this: J. Phys. Chem. 1994, 98, 40, 10258–10268Publication Date (Print):October 1, 1994Publication History Published online1 May 2002Published inissue 1 October 1994https:/…
Abstract : The future of molecularly based Smart Materials hinges on the development of integrated technologies addressing synthesis, assembly, shaping etc and some of these are now becoming clear. Even in the bolt on era new technologies will allow issues of commensurate engineering to be addressed. (mm)
Hinge-bending in T4 lysozyme has been inferred from single amino acid mutant crystalline allomorphs by Matthews and coworkers. This raises an important question: are the different conformers in the unit cell artifacts of crystal packing forces, or do they represent different solution state structures? The objective of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular Weight Dependence of Surface Tension of Linear Perfluorinated Alkane Melts Including High Molecular Weight Poly(tetrafluoroethylenes)Bryan B. Sauer and Gregory T. DeeCite this: Macromolecules 1994, 27, 21, 6112–6116Publication Date (Print):October 1, 1994Publicatio…
The effect of polydispersity on the isotropic-nematic phase transition of rigid rods is analyzed in terms of a second-order perturbation theory, in which the width \ensuremath{\sigma} of an arbitrary number fraction is used as a perturbation parameter. These results show that the isotropic-nematic phase transition tak…
Raman-scattering experiments on heavily irradiated pure and doped NaCl crystals are described. The experiments have been performed at room temperature and at approximately 25 K. The crystals had been irradiated up to a maximum dose of 95 Grad by means of electrons from a Van de Graaff accelerator. The Raman spectra sh…
Oxygen permeability (OP) and water vapor permeability (WVP) of sucrose polyesters (SPE) coatings were measured and compared with other edible and plastic films. the OP of SPE coatings was higher than those of corn-zein films and plastic films such as polyethylene and polypropylene films but was similar to OP of cellul…