Materials Literature
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The complete set of elastic constants’ has been determined for reactor Grade A graphite and also for a nearly isotropic graphite of similar density and crystallite size. The specimens used were irradiated in a hollow fuel element in the materials testing reactor BEPO under conditions of good temperature and neutron fl…
The specific heat and the thermoelectric power of γ-FeMn alloys were measured for three different compositions. The peak of the specific heat at the Néel temperature is broad for Fe 70 Mn 30 but it becomes sharp when the concentration of Fe decreases. This tendency is interpreted in terms of the temperature variation…
Abstract Introduction of primary covalent crosslinks into linear, segmented elastomers was followed by observing their modulus–temperature behavior. The behavior of the linear segmented polymers is explained by association of glassy segments into regions which act as filler and quasi‐crosslink. In several cases crossl…
A quantitative investigation was conducted on the effect of micromechanical stress concentrations on the strength of two‐phase brittle‐matrix ceramic systems. The materials consisted of a continuous brittle matrix containing dispersions with elastic properties different from those of the matrix. A soda borosilicate gl…
Abstract Heterosiloxanes of transition metals contain the characteristic grouping SiOX; in the compounds known so far, X may be Au, Zn, Cd, Hg, Ti, Zr, Hf, V, Nb, Ta, Cr, U, Re, Fe, Co, Ni, or Pt. Most of these compounds are obtained from silanols, metal silanolates, acyloxysilanes, disiloxanes, or alkoxysilanes, i.…
The preparations and amino acid compositions of highly purified tropocollagen and insoluble polymerized collagen are described. These collagens appear to be very suitable for comparative studies in an investigation of the cross-linkages that are introduced into tropocollagen during the formation of polymerized collage…
The morphology of glassy amorphous PETP is characterized by ball-like structures in which a paracrystalline-type order is present. Movement of the balls is seen at annealing temperatures 5†C or more below Tg as well as at higher temperatures. Crystallization from the glass occurs by the formation of spherulites simila…
The photoconductivity decay in imperfect crystals can be described in terms of an exponential trap distribution, Nt(E) = N0 exp(− E/kT*), where N0 and T* are two parameters characteristic of the distribution. Theoretical expressions for the decay as a function of excitation intensity and temperature can be derived in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative product study and a critical evaluation of the thermal decomposition of benzoyl peroxide in benzeneDeLos F. DeTar, R. A. J. Long, Jacob. Rendleman, John. Bradley, and Patrick. DuncanCite this: J. Am. Chem. Soc. 1967, 89, 16, 4051–4057Publication Date (Print):Aug…
The isothermal transformation rates for quartz to tridymite were studied in the presence of binary silicate liquids between the eutectic temperature and 1470°C. Oxide pairs included Na 2 O‐SiO 2 , PbO‐SiO 2 , FeO‐SiO 2 , and Cu 2 O‐SiO 2 . Micrographic and X‐ray analytical procedures were used. Transformation was most…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic studies of permanganate oxidation reactions. II. Reaction with ferrocyanide ionMohamed A. Rawoof and John R. SutterCite this: J. Phys. Chem. 1967, 71, 9, 2767–2771Publication Date (Print):August 1, 1967Publication History Published online1 May 2002Published inissue 1…
Abstract The viscoelastic properties of amylose films plasticized with dimethyl sulfoxide were studied. The modulus–temperature curves of dimethyl sulfoxide‐plasticized amylose are typical for semicrystalline polymers at the higher concentrations of amylose and pass to those of amorphous polymers with the decrease of…
Thin films of nickel ferrite (NiFe2O4) have been prepared by a reactive-sputtering technique using an iron-nickel alloy as the cathode and oxygen-argon mixtures as the reactive gas. Electron microscopy and electron-diffraction studies indicate that films deposited on substrates at temperatures below 0°C are noncrystal…
Pb(Zr-Ti)O 3 ceramics modified with WO 3 show low mechanical quality factor and low coercive field, but ones modified with combination of WO 3 and MnO 2 show high mechanical quality factor, high coercive field and stable aging characteristics. Temperature dependence of the resonant frequency is investigated in the wid…
A description is given of the design and operation of a drafting force tester, with emphasis on the material and process variables which influence test results. Visual observations are reported of sliver contraction, fiber straightening, and fiber snap back. Comparison is made between the force-deformation behavior of…
Abstract Lattice spacings perpendicular to the molecular chain axes and crystallite orientation of dried and moist (boiled in water) bulk nylon 6 were determined by x‐ray diffraction under tension of 30–300 kg./cm. 2 . The deformation of the specimen was also measured. The lattice spacings are changed reversibly by th…
Hall coefficient RH and Hall mobility μ have been measured for annealed polycrystalline and epitaxially grown gold, silver, and copper films at 296° and 77°K. At thicknesses above about 600 Å, nearly bulk values are obtained for RH and μ. Below 600 Å, a film-thickness dependence (size effect) was observed. This depend…
Models of the relaxed plain-knit structure proposed by previous workers suffer from the disadvantage of being based on the assumption of some geometrical shape for the knitted loop and are not derived from equilibrium considerations of the forces and couples applied to one loop by its neighbours. In the work described…
Tropocollagen preparations from carp, buffalo fish, rats, calves, sheep, and humans have been studied by electron microscopy and serologic methods. Tropocollagens from each species appeared identical by electron microscopy but they were readily distinguished (except between sheep and calves) by C'-fixation tests with…
Abstract In an attempt to understand the factors involved in morphogenesis of a complex cell like a scale or bristle, the fine structure of the normal development of bristle cells in Drosophila melanogaster (Oregon R) has been studied and compared with that of the mutants sn 3 and Sb. In the development of the normal…