Materials Literature
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Abstract Radiolytic reduction of AgClO 4 solutions containing a polyanion leads to the formation of long‐lived oligomeric silver clusters which are stabilized on the polymer chains. Under suitable conditions, the accompanying formation of colloidal silver consisting of metallic particles is strongly suppressed and clu…
Describes the realization and use of a modern electron spectrometer. The discussion includes practical guidelines accessible to non-specialists who wish to design their own instrument. The basic characteristics and the design principles of such devices are discussed, with emphasis on the key component: the energy anal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of quinone-substituted octaalkyl porphyrin monomers and dimersJonathan L. Sessler, Martin R. Johnson, Stephen E. Creager, James C. Fettinger, and James A. IbersCite this: J. Am. Chem. Soc. 1990, 112, 25, 9310–9329Publication Date (Print):Decemb…
A density-functional theory of nonuniform fluid mixtures---based on a generalization of the one-component weighted-density approximation---is both presented and applied to freezing transitions in binary mixtures of hard spheres. A necessary step in this application is the specification of the crystal structure of the…
A single-crystal X-ray structure analysis of decagonal Al65Cu20Co15 has been performed using the n-dimensional approach. Five-dimensional space group P10(5)/mmc, a(i)* = 0.2656 (2), a5* = 0.24107 (3)-angstrom-1, d(i) = 3.368 (1), d5 = 4.1481 (3)-angstrom, alpha-ij = 60, alpha-i5 = 90-degrees (i, j = 1,..,4), volume of…
Pearls and Pitfalls in Electrocardiography: Pithy Practical Pointers , Pearls and Pitfalls in Electrocardiography: Pithy Practical Pointers , کتابخانه الکترونیک و دیجیتال - آذرسا
Abstract Carbon electrodes impregnated with three different pitches have been studied and compared. The electrode samples were heated up to 893 K in a thermogravimetric analyser at different heating rates. The weight loss was recorded with respect to time and temperature. A special technique and a calculation procedur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleSynthesis, electronic structure, and reactivity of metallacyclotetraazapentadienes.William C. TroglerCite this: Acc. Chem. Res. 1990, 23, 12, 426–431Publication Date (Print):December 1, 1990Publication History Published online1 May 2002Published inissue 1 December 1990https://pu…
The case of a surface plasmon-polariton (excited by transverse magnetic light) propagating at the interface between an isotropic metal (silver) and an anisotropic (uniaxial) substrate is considered. The field distribution within the system is illustrated when the optic axis of the substrate is not orthogonal in the pl…
Polyvinylchloride (PVC) is a common thermoplastic and one which often contains plasticizers. The most important plasticizer is di-2-ethylhexylphthalate (DEHP). Hygienic conditions in the PVC processing industry were surveyed by measuring the air concentrations of hydrogen chloride, DEHP and phthalic anhydride (PA) in…
The structural features and fracture morphology of raw and chemically treated pineapple leaf fiber have been studied using scanning electron microscopy. Pineapple leaf has a multicellular structure, and alkali treatment clearly reveals the ultimate fibers. Surface morphology progressively changes with gradual removal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEntanglement and the molecular weight dependence of polymer glass transition temperatureY. H. LinCite this: Macromolecules 1990, 23, 25, 5292–5294Publication Date (Print):December 1, 1990Publication History Published online1 May 2002Published inissue 1 December 1990https://p…
New data are given for algodonite (formula), awaruite (formula, space group), billingsleyite (space group, unit cell), bogdanovite (formula, space group), hexatestibiopanickelite (formula), keithconnire (formula), mgriite (formula), polarite (formula), roaldite (space group), sobolevskite (space groups, unit cells), s…
Abstract High amplitude, split-Hopkinson pressure bar (SHPB) laboratory tests were conducted on compacted specimens of 50/80 silica sand to evaluate the influence of saturation on compressional-stress wave velocity, stress transmission, and attenuation. Stress wave velocity and transmitted stress increase as the satur…
Abstract The expandabilities of kaolin-group minerals in different horizons in 10 soils from New Zealand and Fiji were measured immediately after the application of formamide and after the sequential application of hydrazine, water, and glycerol (HWG treatment). The expandabilities of these minerals in some of the soi…
Abstract The verdine facies, previously confused with components of ancient ironstones, has been studied in relation to its distribution, mineralogy, genesis, environment, and geological significance. Several chemically specific components are present including (i) a ferric and magnesian dioctahedral-trioctahedral 1 :…
Abstract not Available.
We describe an experimental study of the effects of various surface treatments on the frictional and tensile properties of cotton and aramid single yams and also on the mechanical properties of fabrics woven from these yams. Lubrication of the yarn or fabric generally reduces those parameters that quantitatively descr…
The dissolution rate of sapphire into CaO‐MgO‐Al 2 O 3 ‐SiO 2 (CMAS) melts was investigated at 1450° and 1550°C. The effects of immersion time, specimen rotation rate, and magnesia concentration in the bulk melt on the sapphire dissolution rate and on the growth rate of magnesium aluminate spinel at the sapphire/melt…
Abstract Melt strength data are presented on the three major classes of commercial polyethylenes (LDPE, LLDPE and HDPE). The LDPE samples studied were polymerised by both tubular and autoclave reactor technology and the LLDPE samples were produced with different α-olefins as comonomer. Melt strength was assessed from…