Materials Literature
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A quasi one-dimensional Hubbard model embodying features of (TMTSF) 2 PF 6 etc. was studied. The SDW gap equation derived by a variational method is solved. The gap parameter is derived at OK and at finite temperatures as a function of the transverse electron transfer energy t '. The SDW transition proves to be of the…
The qualitative and quantitative results deduced by a recent theory [J. Phys. Soc. Jpn. 51 (1982) 515] were found to agree fairly well with the experimental results on NaNO 2 . However, of the theoretical ε vs T graph, the part just above the incommensurate-to-ferroelectric transition point was found to disagree with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 and proton NMR spectroscopy of four- and five-coordinate cobalt(II) porphyrins: analysis of NMR isotropic shiftsAtaollah Shirazi and Harold M. GoffCite this: Inorg. Chem. 1982, 21, 9, 3420–3425Publication Date (Print):September 1, 1982Publication History Published…
Abstract This study of the TESPT modification reaction of silicas gives the compounder new and valuable information about rubber filler-silane interactions. It allows TESPT to be used more practically and economically. It also suggests several areas that would be interesting and worthwhile for further investigation. T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRate control by restricting mobility of substrate in specific reaction field. Negative photochromism of water-soluble spiropyran in AOT reversed micellesJunzo Sunamoto, Kiyoshi Iwamoto, Masashi Akutagawa, Masahiro Nagase, and Hiroki KondoCite this: J. Am. Chem. Soc. 1982, 10…
The third-order nonlinear optical susceptibilities of BK-7 glass and fused silica were measured by nonphasematched optical third harmonic generation (THG). Two methods were employed to determine these magnitudes relative to alpha-quartz: comparison of simple THG fringes arising in sequential measurements of individual…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the addition of allyltrimethylsilane to glycal acetatesSamuel Danishefsky and James F. Kerwin Jr.Cite this: J. Org. Chem. 1982, 47, 19, 3803–3805Publication Date (Print):September 1, 1982Publication History Published online1 May 2002Published inissue 1 September 1982https…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOdd-even effect in thermotropic liquid crystalline 4,4'-dihydroxy-2,2'-dimethylazoxybenzene-alkanedioic acid polymerAlexandre Blumstein and O. ThomasCite this: Macromolecules 1982, 15, 5, 1264–1267Publication Date (Print):September 1, 1982Publication History Published online…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMonomer sequence distributions in ethylene-1-hexene copolymersEric T. Hsieh and James C. RandallCite this: Macromolecules 1982, 15, 5, 1402–1406Publication Date (Print):September 1, 1982Publication History Published online1 May 2002Published inissue 1 September 1982https://p…
The formation of alpha alumina in gamma alumina obtained from ammonium alum was studied at 1150°C. The transformation occurs by a nucleation and growth process, preceded by an incubation time. Mechanical treatments of the gamma alumina markedly increase the density of nuclei and hence the transformation rate. The alph…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer films on electrodes. 8. Investigation of charge-transport mechanisms in Nafion polymer modified electrodesHenry S. White, Johna Leddy, and Allen J. BardCite this: J. Am. Chem. Soc. 1982, 104, 18, 4811–4817Publication Date (Print):September 1, 1982Publication History…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical and nonlinear optical characterization of molecularly doped thermotropic liquid crystalline polymersG. R. Meredith, J. VanDusen, and David J. WilliamsCite this: Macromolecules 1982, 15, 5, 1385–1389Publication Date (Print):September 1, 1982Publication History Publish…
Phase-transition properties of nematic liquid crystals aligned by a short-range, arbitrary-strength-substrate potential are examined in the framework of Landau---de Gennes theory. It is shown that the substrate potential, which can arise from surface treatment of liquid-crystal display cells, not only induces a bounda…
The authors review available experimental information on the existence, thermodynamic stability and physical properties of hydrides formed by the absorption of hydrogen gas in intermetallic compounds of two transition metals. The emphasis is on stability. It is shown that empirical models for the stability of ternary…
In the present work, the second of the new series initiated with industrial Portland cement of high initial resistance, there is studied the influence exerted by the addition of distinct quantities of groundgranulated slag to industrial Portland cement resistant to sulfate (cement 2 < > P-450-Y) in its chemical-resist…
In this paper, we emphasize that now it is possible to use some electrochemical non-destructive techniques for measuring the corrosion rate of the metals. Also, it is possible to use the gravimetric determinations if the appropriate instrumentation is not available. The simple visual observation is a good complementar…
As a consequence of the reconversion of coal in the cement industry, it is considered important to analyze the incorporation and transcendence of certain components in the clinkerisation process. Given in detail are the circuits of gases and volatile materials used in the baking process, emphasizing the interest of su…
This paper describes the chemical composition and the morfological nature of pulverized coal ashes, as well as their physical characteristics. Their influences —actions and effects— on the main properties and behaviour of cements and concretes, and the more adequate conditions for their efficient use un them are also…
The charge density in α-Al2O3 has been refined with respect to X-ray structure factors [complete spheres for both Mo Kα and Ag Kα radiations with (sin θ/λ)max = 1.19 and 1.495 Å-1 respectively] and electric-field gradient tensors at both atomic sites, using Hirshfeld- type deformation functions. Atomic charges from a…