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
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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
The first page of this article is displayed as the abstract.
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…
ESR Linewidths in Solution. II. Analysis of Spin—Rotational Relaxation Data
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…
Analysis of the α, β, and γ relaxations in polychlorotrifluoroethylene and polyethylene: Dielectric and mechanical properties
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…
SECTION 6: THERMAL EXPANSION
Thermal expansion is the change in shape and volume of a system due to a temperature change. For liquids, gases, and isotropic solids, thermal expansion is isotropic, involving only a change in volume and requiring, therefore, the measurement of a single parameter to uniquely specify the expansion. Crystalline solids…
Instabilité électronique et changement de phase cristalline des composés du type V3Si à basse température
Dans V3Si les atomes de vanadium sont disposés suivant des chaînes linéaires denses et on peut appliquer aux électrons d l'approximation des liaisons fortes à une dimension. On constate que l'énergie électronique ainsi calculée s'abaisse par déformation de la maille. Ceci peut constituer une explication, par un effet…
SECTION 5: X-RAY CRYSTALLOGRAPHIC DATA, DENSITIES, AND MOLAR VOLUMES OF MINERALS
X-ray crystallographic data are of particular importance to the mineralogist. Beyond the considerations of structural chemistry, they provide one of the most accurate methods for phase and/or compositional determination and for obtaining the molar volumes and densities of minerals (Table 5-2). Selected data for approx…
The thermal decomposition of sodium nitrate
The kinetics of the thermal decomposition of molten sodium nitrate have been studied as a function of temperature in the range 570–760°. The effect of replacing the air over the reactant by argon has been examined. From these measurements, it is concluded that atmospheric oxygen does not participate in the reaction an…
On the general solution of linear-elastic problems in isotropic and anisotropic Cosserat continua
The existence of couple stresses acting on the surfaces of elastic continua together with the usual force stresses had been object of numerous fundamental papers [ 1 , 7–16 ]. For describing the complete deformation a geometrically independent rotation vector had been introduced besides the displacement vector. In thi…
The thermal conductivity of pyrolytic graphite
The thermal conductivities of three specimens of well-oriented, annealed pyrolytic graphite have been measured over the temperature range 100–900°K. The conductivity parallel to the deposition plane is analysed in terms of mean free paths using the semi-continuum model of Komatsu and Nagamiya. An expression is derived…
The Modifications of Niobium Pentoxide
Abstract Niobium pentoxide crystallizes in numerous modifications. The present paper describes their mode of formation, structures, and thermal properties.