Materials Literature
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X-ray photoelectron spectroscopy was used to study the reoxidation kinetics of both mechanically and chemically polished as well as freshly fractured SrTiO3 surfaces. X-ray take-off angles were varied in order to resolve surface contributions from those further into the sample. Most surfaces were found to have Sr/Ti r…
ABSTRACT Afmite-element formulation is used to obtain numerical solutions to the simultaneous moisture and heat diffusion equations describing the moisture removal and heat intake process for an isotropic sphere. The model is used to solve a sample problem of drying a soybean kernel. The distribution and gradients of…
A two-surface kinematic hardening model for the stress-strain response of metals under nonproportional tension-torsion cyclic loading is developed and verified with critical experiments. In this model, both the yield and limit surfaces are assumed to be ellipses in the two-dimensional stress plane to account for aniso…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT"Intrinsic" response of polymer liquid crystals in photochemical phase transitionTomiki Ikeda, Takeo Sasaki, and Haeng Boo KimCite this: J. Phys. Chem. 1991, 95, 2, 509–511Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic characterization of meso-tetrakis(1-methylpyridinium-4-yl)porphyrins, [(TMpyP)H2]4+ and [(TMpyP)M]4+, in aqueous micellar media, where M = VO2+, Cu(II), and Zn(II)Karl M. Kadish, B. G. Maiya, and C. Araullo-McAdamsCite this: J. Phys. Chem. 1991, 95, 1, 427–431P…
Pure, single‐phase stoichiometric Pb(Fe 0.5 Nb 0.5 )O 3 (PFN) powders were successfully formed by molten salt synthesis using mixtures of NaCl and KCl salts. Lower temperatures and shorter times (1/2 h at 800°C) were needed for singlephase PFN formation from molten salts relative to those required for solid‐phase meth…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of the structure of perfluoro ethers: structural models for poly(perfluoroformaldehyde), poly(perfluoroethylene oxide) and poly(perfluoropropylene oxide)J. Pacansky, M. Miller, W. Hatton, B. Liu, and A. ScheinerCite this: J. Am. Chem. Soc. 1991, 113, 1, 329–343Publicat…
Consider a diffraction of a beam of particles in <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="double-struck upper R cubed"> <mml:semantics> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:msup> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mi mathvariant="double-struc…
An experimental apparatus has been developed to permit simultaneous measurement of temperature change and moisture flux through fabrics during the transient period after one set of fabrics has been exposed to humidity and temperature gradients. Both the water vapor method and the sweat method were used to study the tr…
Abstract The ring‐retaining products formed from the OH radical‐initiated reactions of o ‐, m ‐, and p ‐xylene in the presence of NO x have been identified and their formation yields determined. Experiments were carried out at 298 ± 2 K and in the presence of 740 torr total pressure of air. The products observed, and…
Distribution of bacteria influential on the algal growth during the process of development and decay of Gymnodinium nagasakiense red tide and their effects on the growth of G. nagasakiense and Skeletonema costatum were investigated in Uranouchi Inlet, Kochi. Seawater samples collected around red tide period of G. naga…
The authors present a review of surface dielectric behavior of several polymers under high-voltage (HV) outdoor conditions. The scope is limited to materials used to provide weathersheds on non-ceramic insulators and room-temperature vulcanized silicone rubber coating used on ceramic insulators for combating problems…
The small-amplitude periodic optical transmittance response of redox polymer films is derived and related to the corresponding electrical behaviour. The combination of optical and electrical measurements allows Faradaic and non-Faradaic charging processes to be distinguished. The analysis of the modulated transmission…
Superplasticity in ceramics and ceramic composites is reviewed. Deformation characteristics, and in particular the strain rate sensitivities in these materials, are discussed. From the strain rate sensitivity and grain size dependence, deformation mechanisms in these superplastic materials have been addressed. It appe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrolysis of phenyl picolinate at the mineral/water interfaceAlba Torrents and Alan T. StoneCite this: Environ. Sci. Technol. 1991, 25, 1, 143–149Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 January 1991https://pu…
Abstract Results for four different volume‐dependent rate processes of an epoxy resin, Epon 1001F, fully cured with a stoichiometric amount of 4,4′‐diamino diphenyl sulfone are presented: (1) specific volume measurements at constant rates of cooling; (2) time‐dependent volume measurements after rapid temperature chang…
1′,3′,3′-Trimethylspiro[2H-1-benzopyran-2,2′-indoline](abbreviated to H–SP) and its derivatives, 6-nitro (NO2–SP) and 6-nitro-8-(pyridinium)methyl spiropyrans (Py+–SP), have been intercalated in the interlayers of Montmorillonite. The intercalation was highly dependent on the substituent groups on the SPs. Charged Py+…
Infrared spectra are reported of methanol adsorbed at 295 K on reduced Cu/SiO2 and on Cu/SiO2 which had been preoxidised by exposure to excess nitrous oxide. Methanol was chemisorbed on reduced Cu/SiO2 to give methoxy species on both silica and copper, gave a trace of formate on copper via reaction with residual surfa…
Phthalocyanines (H2Pc) octasubstituted with branched alkoxy chains were synthesized: 2,3,9,10,16,17,23,24- octakis(3,7-dimethyloctoxy)phthalocyanine (1a) and 2,3,9,10,16,17,23,24-octakis(3,7,11-trimethyldodecoxy)phthalocyanine (1b). Their mesomorphic properties were studied by DSC, polarization microscopy and X-ray di…
Abstract The harmonic balance method is a technique for the numerical solution of nonlinear analog circuits operating in a periodic, or quasi‐periodic, steady‐state regime. The method can be used to efficiently derive the continuous‐wave response of numerous nonlinear microwave components including amplifiers, mixers,…