Materials Literature
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This paper investigates the deformations and stresses in the buttocks of a person when he sits on a cushion. The study is motivated by the need for a better understanding of the design of wheelchair cushions and the prevention of decubitus ulcers. The finite element method is used on an axisymmetric model. Surface pre…
Fermi-surface instability leading to charge density waves is a common malady in anisotropic metals, and there is now evidence that it also infects isotropic ones.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and structure of anhydrous zinc chlorideJ. Brynestad and H. L. YakelCite this: Inorg. Chem. 1978, 17, 5, 1376–1377Publication Date (Print):May 1, 1978Publication History Published online1 May 2002Published inissue 1 May 1978https://pubs.acs.org/doi/10.1021/ic5018…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoreduction and photodecarboxylation of pyruvic acid. Applications of CIDNP to mechanistic photochemistryG. L. Closs and R. J. MillerCite this: J. Am. Chem. Soc. 1978, 100, 11, 3483–3494Publication Date (Print):May 1, 1978Publication History Published online1 May 2002Publ…
Abstract The strength and extensibility of an elastomer depend on its overall viscoelastic properties, as reflected in the time and temperature dependence of stress-strain curves, and also on those discrete processes, including crack formation and growth, that culminate in high-speed crack propagation. The discrete pr…
Abstract The extensive literature on equilibrium melting of flexible linear macromolecules has been reviewed during the last year. The discussion in this paper is based on experiments on actual, large, extended chain crystals and extrapolations on metastable crystals. A series of 32 complete sets of melting temperatur…
The crystal structure of Cu9Al4 has been refined on the basis of 114 independent structure factors, averaged from a set of 2416 intensity measurements with a diffractometer on a spherical crystal of 0.05 mm diameter. Graphite-monochromatized Cu Kα radiation was used. The final R value was 2.4% when corrections for abs…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of pyridine with a series of para-substituted tetraphenylporphyrincobalt and -iron complexesK. M. Kadish, L. A. Bottomley, and D. BeroizCite this: Inorg. Chem. 1978, 17, 5, 1124–1129Publication Date (Print):May 1, 1978Publication History Published online1 May 2002P…
The organic conductor bis(tetrathiotetracene)triiodide, (TTT)2I3, was prepared by Isett and Perez-Albuerne. The composition of the charge-transfer complex is shown in Scheme 1. This material was shown to be among the best of presently known organic conductors with a conductivity of 1000 Ω−1 cm−1 at room temperature. I…
Various factors controlling the flashover of solid insulators in pressurized SF6, are reviewed and their influences in gas insulated systems are discussed from a practical point of view. Flashover voltage of clean insulator surface is under the influence of the insulator-metal contact as well as the macroscopic electr…
The sodium ion resistivity of lithia‐stabilized polycrystalline β”‐alumina was measured as a function of temperature for fine‐grained and coarse‐grained specimens with a chemical composition of 8.80 Na 2 0‐0.75 Li 2 O‐90.45 A1 2 O 3 (wt%). A model is presented which explains the dependence of sodium ion resistivity on…
The nature of the origin of the color in anodized aluminum colored by ac electrolysis in electrolytes containing nickel, copper, silver, gold, and molybdenum salts is investigated. The measured specular reflectance spectra in the region 350–750 nm can be adequately explained by assuming that small metallic particles a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemistry of iron phthalocyanine complexes in nonaqueous solvents and the identification of five-coordinate iron(I) phthalocyanine derivativesA. B. P. Lever and J. P. WilshireCite this: Inorg. Chem. 1978, 17, 5, 1145–1151Publication Date (Print):May 1, 1978Publication…
Abstract The reinforcement of elastomers by carbon black is governed by the morphology of the black and its physical and chemical interactions with the polymer. The latter are strongly affected by graphitization and surface oxidation. In modern rubber-grade carbon blacks strong bonding of the polymer to the carbon bla…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPorphyrins. 36. Synthesis and optical and electronic properties of some ruthenium and osmium octaethylporphyrinsArtemis Antipas, Johann W. Buchler, Martin Gouterman, and Paul D. SmithCite this: J. Am. Chem. Soc. 1978, 100, 10, 3015–3024Publication Date (Print):May 1, 1978Pub…
Glasses in the system Al 2 O 3 ‐Y 2 O 3 ‐SiO 2 , containing TiO 2 and La 2 O 3 , were investigated. Glasses of high refractive index and elastic modulus were developed. The observed Young's and shear moduli of these glasses show good agreement with theoretical values. Agreement was also found between the observed and…
Abstract Fourier transform infrared studies of the thermal degradation of polyacrylonitrile (PAN) conducted at 200°C in air and under reduced pressure are presented. The spectra are markedly superior to those published previously. A mechanism consistent with the infrared results obtained under reduced pressure is adva…
Met-tRNA,, initiator methionyl transfer RNA.SDS, sodium dodecyl sulfate; Gpp(CH,)p, guanyl-5'-yl methylene diphosphonate; App(CHJp, adenyl-5'-yl methylene diphosphonate; EMC, encephalomyocarditis.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrediction of Changes in Bubble Size Distribution Due to Interbubble Gas Diffusion in FoamRobert LemlichCite this: Ind. Eng. Chem. Fundamen. 1978, 17, 2, 89–93Publication Date (Print):May 1, 1978Publication History Published online1 May 2002Published inissue 1 May 1978https:…
A theory based on two electrons hopping between defect sites recently proposed (Elliott 1977, 1978) to account for the frequency dependence of the conductivity of chalcogenide glasses is analysed here with regard to the predicted temperature dependence. To a first approximation, the logarithm of the a.c. conductivity…