Materials Literature
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Abstract Auf einen Überblick über Bedeutung und Methoden der Wärmespeicherung in Form sensibler und latenter Wärme folgen die Vor und Nachteile der reversiblen thermochemischen Energiespeicherung im Vergleich zu den konventionellen Energieträgern wie Brennstoffen, d. h. irreversiblen chemischen Energieträgern. Von den…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of potential mechanism-based inactivators of lanosterol 14.alpha.-methyl demethylaseLeah L. Frye and Cecil H. RobinsonCite this: J. Org. Chem. 1990, 55, 5, 1579–1584Publication Date (Print):March 1, 1990Publication History Published online1 May 2002Published inissu…
The water vapour transmission rates (WVTR) through solvent cast polymer films prepared from cellulose acetate, cellulose acetate propionate, and cellulose acetate butyrate have been determined. They were influenced by the relative humidity, the substituent type and the extent of substitution. Increasing the relative h…
The thermodynamic predictions of microstructures in the multicomponent alloys used for duplex stainless steels are discussed in detail in this paper. The production of the duplex ferrite–austenite microstructure by high temperature (1323–1423 K) annealing is considered. Phase diagrams are calculated for Fe–Cr–Ni terna…
Diffraction and absorption losses of plasmon surface waves (PSW) propagating along a metallic grating are investigated numerically as a function of groove depth. A periodicity of diffraction losses is found to exist. The energy flow distribution (EFD) above and inside the grooves is calculated and a similarity between…
Abstract The tensile properties: Young's modulus, ultimate tensile strength, ultimate elongation, the glass transition temperature, and the dynamic mechanical properties (dynamic shear modulus ( G '), loss tangent (Tan δ)), of three epoxy resins (Epon 828, Epon 836, Epon HPT 1071) cured with the disulfide‐containing c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of substituted tetrabenzotriazaporphyrins and a tetranaphthotriazaporphyrin: a route to mono-meso-substituted phthalocyanine analogsClifford C. Leznoff and Neil B. McKeownCite this: J. Org. Chem. 1990, 55, 7, 2186–2190Publication Date (Print):March 1, 1990Publica…
Based on expressions for transient three-phase short-circuit current, the formulas for radial and axial electromagnetic forces acting on transformer windings are derived. The short-circuit forces, include three components: DC component, fundamental-frequency component, and double-frequency component. Using a 17000-kVA…
The smectic-A (Sm-A) to chiral-smectic-C transition has been studied by high-resolution ac calorimetry in seven mixtures of two chiral esters of 2,5-diphenyl pyrimidine (2f+3f) over the range 38.72\ensuremath{\le}${\mathit{X}}_{2\mathit{f}}$\ensuremath{\le}65.30, where ${\mathit{X}}_{2\mathit{f}}$ is the mole percent…
A similar phenomenon of continuation beyond a blow-up point has been found in unsteady Hele-Shaw problems and for one-parameter families of two-dimensional obstacle problems in [23, 21}.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 NMR study of poly(2,6-dimethyl-1,4-phenylene oxide)s. Sites of amine incorporationD. M. White and S. A. NyeCite this: Macromolecules 1990, 23, 5, 1318–1329Publication Date (Print):March 1, 1990Publication History Published online1 May 2002Published inissue 1 March…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly oriented low-modulus materials from liquid-crystalline polymers: the ultimate penalty for solubilizing alkyl side chainsAaldrik R. Postema, K. Liou, Fred Wudl, and Paul SmithCite this: Macromolecules 1990, 23, 6, 1842–1845Publication Date (Print):March 1, 1990Publicat…
In order to estimate the influence of occlusion and sweating on forearm and vulvar skin surface water loss (SSWL), both were measured simultaneously and continuously for 30 min in 8 healthy women. Vulvar SSWL decreased significantly during the measuring period from 24.9 +/- 5.2 gm-2 h-1 (mean +/- standard error of the…
Dimethyltitanocene is an excellent catalyst for the redistribution of alkoxy- and siloxyhydrosilanes. The redistribution reactions of triethoxysilane, diethoxymethylsilane, 1,3,5,7-tetramethylcyclotetrasiloxane, pentamethyldisiloxane, and H—(SiMe 2 O) n —SiMe 2 H (n = 1 to 3) are described. The mechanism of these reac…
SUMMARY The variation in the solubility of aluminium in some acid soils of south‐eastern Australia has been investigated. The hypothesis was that leaching of silicic acid influenced the extent of clay decomposition, and hence aluminium solubility, in accord with Le Chatelier's principle. In lower rainfall areas (<…
Abstract The mechanisms of photooxidation usually envisaged, are perfected by taking into account photoreactions of peroxy radicals. They involve interaction of a peroxy radical with the polymer to yield a hydroperoxy radical and a pair of macroradicals. After peroxidation, this pair will usually undergo bimolecular t…
Quasi-periodicity under certain conditions of the dependence of grating properties on groove depth is explained from the point of view of energy flow distribution (EFD). The formation of curls in flow maps is followed as a function of the groove depth h for two general types of gratings having one or two propagating d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and packing in crystalline aliphatic polyestersWen Bin Liau and Richard H. BoydCite this: Macromolecules 1990, 23, 5, 1531–1539Publication Date (Print):March 1, 1990Publication History Published online1 May 2002Published inissue 1 March 1990https://pubs.acs.org/doi…
Abstract Structure‐properties relationships of poly(ether/ester)s (PEEs) 1 based on poly(butylene terephthalate) (PBT) and poly(ethylene glycol) (PEG) are studied. By varying the length of the soft segments (PEG) of molecular weights 600, 1000 and 2000) two series of PEEs are obtained, (i) with constant mole ratio PBT…
Abstract Micropore distribution and effective size of the channels of natural sepiolite from Turkey were measured by the BET method. Before the BET measurement, the samples were treated under a water vapour atmosphere at various pressures to fill progressively the sepiolite micropores with water. The surface areas mea…