Materials Literature
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Dislocation structures in sapphire deformed by basal slip at 1200° to 1500°C were studied by transmission electron microscopy. Long dislocation dipoles of edge character are formed by interactions of dislocations on parallel basal planes (“edge‐trapping”); screw dislocations annihilate by cross‐slip. The accumulation…
The free energy for a system of hard spherocylinders with midpoints constrained to random motion in a plane, serving as a zeroth-order approximation to one layer of a smectic liquid crystal or a two-dimensional nematic liquid crystal, has been calculated for spherocylinders with a length-to-width ratio of 5. For $\ens…
Abstract The mechanism by which low profile character is achieved in unsaturated polyester systems has been investigated. Using techniques of microscopy, data are developed that support a model in which micro stress cracking is induced to relieve stress promoted by polymerization shrinkage. Thus the strain is accommod…
Abstract Two component topologically‐interpenetrating polymer networks were made of the SIN type (simultaneous interpenetrating network) composed of two polyurethanes (a polyether‐based and a polyester‐based) in combination with an epoxy resin, a polyacrylate and two unsaturated polyesters. The linear polymers and/or…
Pseudoelaatioity in quasibinary Au-Cu-Zn alloys (e/a = 1·45, 1·46, 1·47 and 1·48) was studied by an analysis of stress-strain curves, and explained on the basis of lattice softening. The growth morphology of stress-induced martensite was observed, and its crystal structure and axial ratio were found to be an orthorhom…
Monte Carlo calculations have been applied to the electron scattering theory in scanning electron microscopy. These calculations are based on a single-scattering model in which the screened Rutherford expression for single-scattering cross section and the continuous energy-loss equation of Bethe are used. The surface…
We have used low-energy electron irradiations in conjunction with a bending-cantilever-plate technique to investigate the volume dilatations produced by ionization effects in fused silica. Our irradiations generally cause compaction in agreement with previous data from high-energy electron irradiations, but we consist…
M\"ossbauer-effect measurements on $^{57}\mathrm{Fe}$ have been carried out on the cubic Laves compounds Ce${\mathrm{Fe}}_{2}$, Gd${\mathrm{Fe}}_{2}$, and Lu${\mathrm{Fe}}_{2}$ between 80 and 300 K. The analysis of the M\"ossbauer spectra allowed the determination of the easy axes of magnetization $\stackrel{\ensurema…
The elastic constants of a disordered Fe 72 Pt 28 single crystal have been measured as a function of temperature. All elastic constants behave highly anomalously below T c due to the Invar properties of this alloy. The magnetic contribution to the shear modes C '=( C 11 - C 12 )/2 and C = C 44 can be described by the…
Abstract Adsorption of albumin, γ‐globulin, and fibrinogen from solution, under both static and flow conditions, onto several hydrophobic polymers was studied using internal reflection infrared spectroscopy. Isotherm curves experimentally found were consistant with Langmuir type adsorption. The rate and amount of prot…
Magnetic domain structure in epitaxial YIG films was investigated using Faraday effect and Bitter method. These experiments have shown complex structures of closure domains. The influence of in-plane magnetic fields and stresses on the magnetization position was measured. The observed variation was interpreted in the…
Knudsen effusion studies were conducted on CdO(s) in fused‐SiO 2 Knudsen cells from 889 to 1110 K. The orifice size was varied; the largest cell orifice yielded a calculated pressure significantly lower than could be accounted for by experimental error. Average‐slope‐ and average‐free‐energy‐function‐based values of Δ…
A very wide range of extremely high precision single-plane hexagonal lattice sums were calculated by computer. These sums are necessary to the Lennard-Jones interaction potential theory for hexagonal layered crystals. As an application, interplanar spacing, c-axis lattice energy, c-axis elastic moduli, and their chang…
Abstract Trialkylboranes are readily electrolyzed by using graphite as an anode in a sodium perchlorate-methanol solution containing sodium methoxide or a sodium acetate-acetic acid solution to give corresponding alkyl methyl ethers or alkyl acetates in good yields, respectively.
Single crystals of zinc have been deformed in compression along directions close to 〈1·00〉 and 〈11·0〉. High-voltage electron microscopy has been used to identify the dislocations in the deformed crystals. Crystals which deform by kinking, without significant prior plastic deformation, contain dislocations of b = ⅓〈11·…
A new calculation method of electron transport in a medium with boundaries has been developed. The method is based on the solution of the kinetic equation, written for the segments model in the continuous slowing down approximation. The distribution function is represented in the Fourier-Legendre expansion and the equ…
The results of carefully controlled laboratory experiments on contaminated flat plate insulators are presented. Flashover voltages and salt migration effects are shown for the following nine common salts: NaCl, NaNO3, Na2SO4, MgC12, Mg(NO3)2, MgSO4, CaCl2, Ca(NO3)2, and CaSO4. Our results show that the tendency for an…
This article modifies the Almon polynomial distributed lag to allow for a lag of infinite length. Estimation of the model is considered, and an empirical example is given to illustrate the usefulness of the model
The effects of tensile and compressive stresses applied parallel to the magnetic flux path were observed on specially shaped specimens cut from blocks of low-loss MnZn ferrous ferrite typical of those used for inductor cores. The permeability, losses and coercivity were observed as functions of temperature. Stress lev…
A simple and versatile electron biprism of the Mollenstedt type is presented, which allows the conversion of a Siemens Elmiskop 101 electron microscope for use as an interference microscope or as an electron interferometer. The microscope's performance with the biprism inserted at the level of the selector aperture pl…