Materials Literature
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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…
Abstract Antimony(V)-phthalocyanine, [Sb(pc)Cl2]+ (where pc2− = phthalocyaninate, C32H16N82−), has been prepared and characterized for the first time. Of the metallophthalocyanines without any substituent groups so far reported, it has the Q-band at the longest wavelength and the smallest first ring-reduction potentia…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid-Liquid Equilibria for 2,3-Butanediol + Water + Organic Solvents at 303.15 KSadhana Sharma, Girish Pandya, Tapan Chakrabarti, and Purushottam KhannaCite this: J. Chem. Eng. Data 1994, 39, 4, 823–826Publication Date (Print):October 1, 1994Publication History Published o…
The structure of the tetragonal a-phase of lanthanide derivatives of (bis)phthalocyanine PcL III Pc ox (Pc=[C 32 H 16 N 8 ] 2- , Pc ox =[C 32 H 16 N 8 ] - , L=lanthanide) crystals is reported. The crystals of PcNdPc ox (I) and PcPrPc ox (II) crystallized on a platinum anode with (I) a=19.544 (2), c=6.514 (1) A, Z=2, P…
Far-infrared absorption and reflection spectra of ${\mathrm{As}}_{2}$${\mathrm{S}}_{3}$ glass have been measured in the frequency range 10--60 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ at room temperature. The absorption coefficient \ensuremath{\alpha}(\ensuremath{\nu}) has been determined as a function of frequency…