Materials Literature
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A model is developed for the failure time of a bundle of fibers subjected to a constant load. At any time, all surviving fibers share the bundle load equally while all failed fibers support no load. The bundle may collapse immediately or fibers may fail randomly in time, possibly more than one at a time. The failure t…
The periodic multilayers of dielectric materials such as polystyrene/collodion or polystyrene/polyvinyl alcohol were fabricated by means of alternately dropping these solutions onto a spinner. As these materials are slightly elastic, a large shift of the center of the Bragg reflection by 650 Å toward shorter wavelengt…
Some electron microscope observations are presented showing the dissociation of [100] tilt boundaries in thin-film welded bicrystals of gold. Boundaries near Σ9, Σ11, and Σ99 misorientations dissociate to give twins and lower energy boundaries. The boundaries produced are not always of higher coincidence (lower Σ) tha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular structure and magnetic properties of the chloro-bridged dimer chloro[hydrotris(1-pyrazolyl)borato]copper(II). Observation of a ferromagnetic ground stateStephanie G. N. Roundhill, D. Max Roundhill, Darrel R. Bloomquist, Christopher Landee, Roger D. Willett, David M…
The formation of Li 2 VX 2 ( X = S , Se ) in Li/Li + , propylene carbonate ( PC ) / LiVX 2 cells occurs near 1.0V. The selenide, Li 2 VSe 2 , has been previously described. Magnetic susceptibility and x‐ray powder diffraction data are presented for Li 2 VS 2 . The LiVX 2 / Li 2 VX 2 couples are reversible and two phas…
In the presence of carbon or silicon carbide, silica can be reacted to form a vapor of silicon monoxide. The rates of these reactions were explored at 1300° to 1550°C. For mixtures of carbon and silica, evidence supported a two‐step reaction: silicon carbide formed prior to reaction between silicon carbide and silica.
Abstract Silk fibroin films in the random‐coil and β‐form conformations were immersed in water at temperatures from 2 to 130°C, and conformational changes were followed by x‐ray diffraction, infrared spectroscopy and differential scanning calorimetry. On treatment with water below 60°C, the random‐coil conformation is…
Emission from argon saturated aqueous alkali metal salt solutions is observed during insonation at 460 kHz. It is postulated to arise from de-excitation of excited alkali metal atoms formed by free radical reduction processes. In addition to the emission resonance lines, diffuse bands are observed at ∼554 nm and ∼740…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStatic and dynamic Jahn-Teller distortions in CuN6 complexes. Crystal structures and EPR spectra of complexes between copper(II) and rigid, tridentate cis,cis-1,3,5-triaminocyclohexane (tach: Cu(tach)2(ClO4)2, Cu(tach)2(NO3)2. Crystal structure of Ni(tach)2(NO3)2J. Ammeter,…
Abstract Our recursive method is extended to calculate several new parameters for stepwise polyfunctional polymerization. In the pregel region we calculate weight average molecular weight, M w , for polydisperse reactants and effective average functionality, f e , of a reacting mixture. These quantities are useful for…
Magnetic properties observed experimentally in the 3d transition-metal dichalcogenides with the pyrite structure are reviewed and compared with properties expected theoretically for the Hubbard model. As characteristics of electrons in a narrow band, the following are discussed: (1) The temperature induced and field i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular Weight and Temperature Dependence of Polymer Dimensions in SolutionA. Ziya Akcasu and Charles C. HanCite this: Macromolecules 1979, 12, 2, 276–280Publication Date (Print):March 1, 1979Publication History Published online1 May 2002Published inissue 1 March 1979https…
NMR results are used to evaluate the spin-orbit contribution to the magnetic anisotropy of Co atoms at individual Co sites in $R{\mathrm{Co}}_{5}$ compounds. The easy $c$-axis Co anisotropy of $R{\mathrm{Co}}_{5}$ compounds is found to arise from the ($2c$) sites, while the ($3g$) sites make a smaller opposing contrib…
Abstract not Available.
The recrystallization kinetics of alloys containing a stable, dispersed second-phase are reviewed, and the effects of interparticle spacing, particle size, particle strength, and strain are considered. An outline is given of the deformation mechanisms in two-phase alloys, the origin of the misoriented zones associated…
Abstract We propose a theory for the appearance of two‐phase structures during the formation of polymer membranes from a casting solution immersed in a coagulant bath. Our model is based on diffusion induced phase separation at the spinodal in the ternary nonsolvent‐solvent‐polymer system. A simplified treatment of th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface Studies on Multicomponent Polymer Systems by X-ray Photoelectron Spectroscopy. Polystyrene/Poly(ethylene oxide) Diblock CopolymersH. Ronald Thomas and James J. O'MalleyCite this: Macromolecules 1979, 12, 2, 323–329Publication Date (Print):March 1, 1979Publication His…
The spectral dependence of the absorption coefficient of silicon for photon energies up to 2.7 eV was determined for several temperatures in the range 298–473 K. The effect of a temperature increase appears as a red shift of the absorption spectrum. The magnitude of the shift is larger than that of the fundamental ene…
El autor expone, en esta primera parte, la cuestión desde el punto de vista del fabricante limitándose a las consecuencias apreciables en las cualidades del hormigón. Trata de responder a dos preguntas: ¿Por qué se debe cambiar el contenido de aluminato tricálcico de un cemento? ¿Qué beneficios, o que perjuicios, prod…
Se puede afirmar que la durabilidad del hormigón está principalmente condicionada a su compacidad y a su aislamiento de los ambientes agresivos. Los agentes destructores endógenos se consideran eliminados cuando el hormigón está preparado correctamente, con materiales durables y técnica perfecta de amasado, colocación…