Materials Literature
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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…
The development of stress in evaporated dielectric and metal films, used as optical coatings, has been investigated experimentally by observing the bending of a thin silica strip as it becomes coated. The strip forms one mirror of a laser interferometer mounted within the coating chamber, giving high measurement sensi…
In previous papers1–5 the remarkable properties of a liquid birefringent phase that separates from certain solutions of polypeptides in organic solvents when a limiting concentration is exceeded have been described. This phase, first observed by Elliott and Ambrose1 in solutions of poly-γ-benzyl-L-glutamate (PBLG) sho…
-crystallographic axis in intercrossing branches is circa 80°. The possible origin of this unusual mode of twinning, which involves an 80° change in the orientation of the chain axes in offspring branches from that in parent branches, is briefly presented. The process of evolution of monoclinic polypropylene spherulit…
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Soap films can be subjected to compressive stresses exceeding 1 atm while their thickness is measured optically in an apparatus which is described in detail. It permits forming the film within a ring of porous porcelain whose pores communicate to the outside, whereas the film is in an enclosure in which the air pressu…
In 1889 Reinitzer,1 working with cholesteryl benzoate, discovered a state of matter that was later ter med cholesteric liquid crystals. It is doubtful whether the discovery of liquied crystals would have been made at that time if the optical properties of the cholesteric phase were less pronounced. Like other liquid c…
In Part I of this series the residual linewidths for vanadyl acetylacetonate in toluene were found to be proportional to (T/η), where η is the viscosity, and independent of applied field. Since the solutions are dilute, spin exchange is not important. The residual linewidth is attributed to a spin—rotational relaxatio…
Abstract Theoretical models for the ac and γ e relaxation effects found in chain‐folded polymer crystals (single crystal mats and bulk) are presented and compared with the available dielectric and mechanical loss data for polyethylene and polychlorotrifluoroethylene. Details of morphology and crystal structure that ca…