Materials Literature
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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…
Half-leaky guided modes are used to determine accurately the cone angle in a smectic-${\mathit{C}}^{\mathrm{*}}$ liquid crystal as a function of temperature. Homeotropic alignment is obtained using only an in-plane electric field and electroclinic and voltage-induced effects are made negligible. The data obtained is f…
A modified Pechini chemical preparation technique was used to produce enstatite (MgSiO 3 ) powder. By this method, low‐temperature stable orthoenstatite (OE) was obtained at 850°C after 2 h of calcination. The effects of annealing temperature/time, initial particle size, chemical dopants, and shear stress on the conve…
A surface plasmon-polariton (SPP) polarizer with a shorter polarizer length can be realized by strong coupling of a metal film to a core, that is, by matching of the phase constant of the SPP wave in the metal film to that of the guided mode in the core and by selection of a suitably thin buffer-layer thickness. To ca…
Fluorescence and excitation spectra of ${\mathrm{Cm}}^{3+}$ diluted in ${\mathrm{ThO}}_{2}$ powder are reported at room and low temperatures. The observed ${\mathrm{Cm}}^{3+}$ spectra are from the cubic symmetry lattice site and are assigned to phonon-assisted electric dipole transitions and to magnetic dipole transit…
SBR-NBR and CR-NBR blends were prepared with different con centrations, namely 0, 20, 40, 60, 80 and 100%, and measured dielectrically over a wide frequency range (10 -2 -10 6 Hz) and at different temperatures (-10°-25°C). The aim of the present work is to employ the dielectric method to investigate the compatibility…