Materials Literature
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A set of equations has been derived to describe the dynamical motions of small cavitation bubbles in liquids set into motion by an acoustic pressure field. The mathematical formulation takes into account heat conduction inside a bubble and in the surrounding liquid, and the viscosity, compressibility, and surface tens…
1 The effects of adenosine triphosphate (ATP) and adenosine diphosphate (ADP) were investigated on evoked end-plate potentials (e.p.ps) and on miniature end-plate potentials (min. e.p.ps) recorded from muscle fibres of the rat diaphragm and the frog sartorius.2 ATP and ADP decreased the quantum content of the e.p.ps a…
Mechanisms of liquid-liquid phase separation were studied in the binary styrene-acrylonitrile copolymer/poly(methyl methacrylate) system. Evidence is presented which suggests that spinodal decomposition occurs in this system. The Cahn theory provides an interpretation of key experimental results. Both a dispersed, two…
The crystal structures of the ‘cristobalite’ phases of SiO4 and AlPO4 have been determined from X-ray data collected at high temperatures. A model is suggested which gives a much better fit to the data than previously published structures. In this model, the 16 oxygen atoms of the unit cell are statistically distribut…
Some magnetic properties of ACo 2 compounds, where A is a heavy rare earth metal, are shown to be related to properties of YCo 2 . In particular the existence of first order transitions for A=Er, Ho, Dy, but second order transitions for A=Tb, Gd, implies a special temperature dependence of the Landau parameter B which…
The results of a molecular-dynamics study of a simple model of a molten salt are reported. The interionic pair potential which is used consists of the Coulombic term an an inverse-power repulsion which is assumed to be the same for all ions. The structure of the liquid is found to be dominated by charge-ordering effec…
Abstract A method of analysis is given by which the critical strain energy release rate G c for impact tests may be deduced for both Charpy and Izod tests from normal energy measurements. Suitable calibration factors are determined and the method is applied to a range of polymers. Very close agreement is achieved betw…
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Biomaterials are capable of heat transfer-energy transport by virtue of a temperature gradient. In the case of a living biomaterial, the heat transfer capability of the material can be especially important because the state of life may depend upon the maintenance of a specific temperature. All of the three basic mecha…
Abstract Poly‐ p ‐benzamide of high molecular weight (η inh = ∼ in H 2 SO 4 ) was obtained by the direct polycondensation reaction of p ‐aminobenzoic acid ( p ‐ABA) by means of diphenyl and triaryl phosphites in N ‐methylpyrrolidone (NMP)‐pyridine solution containing lithium and calcium chlorides. Molecular weight of…
A set of constitutive equations has been formulated to represent elastic-viscoplastic strain-hardening material behavior for large deformations and arbitrary loading histories. An essential feature of the formulation is that the total deformation rate is considered to be separable into elastic and inelastic components…
The basic physical parameters which govern the metal-insulator transition in vanadium dioxide are determined through a review of the properties of this material. The major importance of the Hubbard intra-atomic correlation energy in determining the insulating phase, which was already evidenced by studies of the magnet…
This review gives information on the electric and optical properties of liquid crystals (LC), and discusses in detail various electro-optical effects in nematic, cholesteric, and smectic LC. Dielectric deformations of LC in electric fields, electrodynamic instabilities, the electromechanical effect, etc., are treated.…
An experimental investigation of impact-initiated failures in high-strength graphite/epoxy and Kevlar-49/epoxy sandwich structures has been conducted. The tests consisted of firing small diameter aluminum projectiles with a velocity range of 16-67 meters/second (52-220 ft/sec) at preloaded sandwich specimens. These te…
Plasmons in the one-dimensional organic metal tetrathiafulvalene-tetracyanoquinodimethane were directly measured by high-energy inelastic electron scattering in thin crystalline films at 300\ifmmode^\circ\else\textdegree\fi{}K. For plasmons propagating along the conducting $b$ axis the plasmon energy decreases from 0.…