Materials Literature
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The rate and products of the uranium + water + oxygen reaction have been studied. Oxygen reduces the corrosion rate 30 to 100-fold and is consumed during the reaction. The oxygen is converted to water and does not react directly with the uranium. Only traces of hydrogen are evolved except under condensation conditions…
The heat capacities of UN, UN1.59 and UN1.73 have been measured from 11 to 320°K. The Cp curves for the three compounds show anomalies at 52, 94 and 33°K respectively, corresponding to magnetic ordering phenomena. The values of the standard thermodynamic functions are tabulated, together with heats and entropies of th…
Abstract We first summarize available experimental evidence indicating the existence of a second‐order transition or relaxation region in atactic polystyrene at 60 to 100°C. above T g . It increases from 137°C. at a molecular weight of 3000 to 192°C. at a molecular weight of 392,000. It appears in such diverse measure…
The persistence of vaccinia virus on wool (blanket and gabardine) and cotton (sheeting, terry cloth, and knit jersey) fabrics was studied. The fabrics were exposed to the virus by three methods: direct contact, aerosol, and virus-containing dust having a high content of textile fibers. Fabrics exposed to virus by each…
The effects of temperature, relative humidity and pH on the rate of the uranium + water reaction have been studied. Linear rates of corrosion and hydrogen evolution are obtained at different temperatures and the derived activation energies vary from 12 to 17 kcal mole–1 depending on the batch of uranium. Hydrogen has…
Abstract The microhardness‐load characteristics for five alkali halide crystals are studied. The equation H = 1854 ad n −2 appears to be valid for all samples, all crystals having the same value of n but different values of a. The results are generalized to all alkali halide crystals with the NaCl‐type lattice. The ph…
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Abstract Using the method of images, the stress field of a screw dislocation in and near a lamellar inclusion is determined. The general solution holds for many simple cases involving straight boundaries, such as metals with surface film, thin plates, or composite materials of laminated structure. The image force on t…
Article Untersuchungen zum Wirkungsmechanismus glykosidspaltender Enzyme, I. Darstellung und Eigenschaften spezifischer Inaktivatoren was published on January 1, 1966 in the journal Biological Chemistry (volume 345, issue Jahresband).
The oxidation of uranium mononitride UN has been investigated and some comparative measurements carried out on uranium monocarbide UC. Powdered UN, of surface area 0.2–0.4 m2/g, oxidizes isothermally at a measurable rate in the temperature range 230–270°C. The reaction kinetics are independent of oxygen pressure (50–7…
Both cubic and rhombohedral forms of boron arsenides were made by the vapor‐phase technique. Energy gaps of the cubic and rhombohedral forms were estimated to be 1.46 and 1.51 ev, respectively, by the optical transmission technique of powdered samples. Mixed crystals of boron arsenide‐gallium arsenide were also prepar…
Using the apparatus described in the preceding report, the effects of superimposed ultrasonic vibration on compressive deformation were investigated with several materials. The flow stress of compression can be reduced by superimposing the vibration. However, the effectiveness differs with the kind of specimen, being…
The measured stresses associated with the growth of oxide on the surface of aluminum are much lower than those calculated from the Pilling‐Bedworth ratio. The magnitude of the stresses in alumina formed anodically on pure aluminum is shown to be dependent on the rate of formation. Some experiments are described which…
Abstract The influence of the orientation with respect to the direction of stresses has been investigated over the temperature range 77 to 413 °K. At temperatures below 300 °K the limit of the proportionality of strain to stress and the rate of work‐hardening depend markedly on the orientation. At temperatures above 3…
Pyridine molecules form strong hydrogen bonds with pyridinium ions in the interlayer space of montmorillonite, causing a marked perturbation of vibrations involving the NH+ group. These vibrations are not perturbed by interlayer benzene. Water molecules directly co-ordinated to Ca2+ and Mg2+ form strong hydrogn bonds…
Compressive strength and instability failure mechanism in uniaxial boron fiber-metal matrix composite material
Article Physical and Chemical Properties of the Gelatinous Layer in Tension Wood Fibres of Aspen (Populus tremula L.) was published on January 1, 1966 in the journal Holzforschung (volume 20, issue 6).
The effect two‐dimensional pressure on the permittivity of fine‐ and coarse‐grained ceramic BaTiO 3 was investigated. It was shown that, unlike coarse‐grained (10° or above) barium titanate, the permittivity of the fine‐grained (1μ mean) material increased with the increase in two‐dimensional compression perpendicular…
In several previous papers [ 1, 2, 3 ], we presented some properly invariant nonlinear continuum theories of micro-elastic solids and micro-fluids in which the first stress moments, micro-stress averages and inertial spin play important roles. In the present paper we extend some of these ideas in the formulation of co…
In homogeneously ordered liquid crystals of the nematic type, two principal dielectric constants can be measured: ϵ1 parallel and ϵ2 perpendicular to the symmetry axis of the liquid crystal. The two dielectric constants may show a very different relaxation behavior. With alkoxy derivatives of azobenzene, only the norm…