A General Relation for Strengths of Concrete Specimens of Different Shapes and Sizes
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Screw Dislocations in and near Lamellar Inclusions
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…
Untersuchungen zum Wirkungsmechanismus glykosidspaltender Enzyme, I. Darstellung und Eigenschaften spezifischer Inaktivatoren
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).
Oxidation of uranium mononitride and uranium monocarbide
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…
Preparation and Properties of Boron Arsenides and Boron Arsenide-Gallium Arsenide Mixed Crystals
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…
Effects of Superimposed Ultrasonic Vibration on Compressive Deformation of Metals
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 Mechanical Properties of Thin Anodic Films on Aluminum
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…
The Effect of Orientation on the Yielding and Flow of Molybdenum Single Crystals
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…
An infrared study of the co-ordination of pyridine and water to exchangeable cations in montmorillonite and saponite
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…
Prediction of compressive strength in uniaxial boron fiber-metal matrix composite materials.
Compressive strength and instability failure mechanism in uniaxial boron fiber-metal matrix composite material
Physical and Chemical Properties of the Gelatinous Layer in Tension Wood Fibres of Aspen(Populus tremulaL.)
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).
Effect of Two‐Dimensional Pressure on the Permittivity of Fine‐ and Coarse‐Grained Barium Titanate
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…
Mechanics of micromorphic materials
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…
Dielectric Relaxation in Nematic Liquid Crystals
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…
Stresses Developed in Optical Film Coatings
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…
The Cholesteric Phase in Polypeptide Solutions and Biological Structures
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…
The spherulitic crystallization of isotactic polypropylene from solution: On the evolution of monoclinic spherulites from dendritic chain-folded crystal precursors
-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…
Transition-metal compounds containing clusters of metal atoms
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Direct measurement of the variation of double-layer repulsion with distance
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…
Cholesteric Structure-1 Optical Properties
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…