Diffusion of Gases in Polymeric Foams
Gaseous diffusion in polymeric foam and experimental results, using closed cell polyurethane foam
Materials Literature
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Image Recording in Electron Microscopy
Three properties of any recorder are of primary importance in electron microscopy: (1) its spread function, (2) its signal-to-noise characteristics (or, detective quantum efficiency, DQE), and (3) its sensitometric curve shape. Photographic materials are found to have spread functions that are not limiting under norma…
Structure of Lysozyme: XII. Effect of pH on the Stability of Lysozyme*
In order to know the role of ionizable groups in the stability of the lysozyme [EG 3.2.1.17] molecule, the effect of pH on the optical rotatory and ultraviolet spectral properties was investigated. The optical rotatory properties of lysozyme did not change at pH's between 8 and 1. However, the acid-vs-neutral differen…
Simultaneous Diffraction and Borrmann Effect
Simultaneous diffraction of X-ray is theoretically studied for four cases in which the relevant reciprocal points form an isosceles triangle, an equilateral triangle, a square, or a regular hexagon. Explicit expressions are derived for the X-ray wave-field in the crystal when all sets of the diffracting planes concern…
Some studies of Cr3+ions and Mn4+ions in magnesium oxide
The electron spin resonance spectra of magnesium oxide show that Cr 3+ and Mn 4+ ions occupy substitutional sites in the lattice. Their symmetry will be either octahedral or lower depending on whether the necessary chargecompensating defect is remote from or near to these ions. A new spectrum due to Cr 3+ in sites wit…
Electron Transport Theory, Calculations, and Experiments
A review of the state-of-the-art of electron transport theory and calculations for electrons in the energy range below 10 MeV is presented. The basic interactions that influence the behavior of electrons are reviewed and theory and experimental results are compared wherever possible. The continuous slowing down model,…
APPLICATION OF X-RAY TOPOGRAPHY TO THE ANALYSIS OF THE DISLOCATION ARRANGEMENT IN DEFORMED COPPER SINGLE CRYSTALS
The paper deals with the application of Berg–Barrett X-ray topography to deformed copper single crystals. The imaged surfaces were sectioned from the deformed bulk crystals parallel to low-index planes.In stage I of the work-hardening curve, the braids of primary edge-dislocation dipoles, well known from electron tran…
Luminescence and energy transfer in solutions of rare earth complexes. II. Studies of the solvation shell in europium(III) and terbium(III) as a function of acetate concentration
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence and energy transfer in solutions of rare earth complexes. II. Studies of the solvation shell in europium(III) and terbium(III) as a function of acetate concentrationJohn L. Kropp and Maurice W. WindsorCite this: J. Phys. Chem. 1967, 71, 3, 477–482Publication Dat…
Adjoint and Importance in Monte Carlo Application
The use of the Monte Carlo method for the study of deep penetration of radiation into and through shields entails the use of sophisticated methods of variance reduction to make such calculations economical or even feasible. This paper presents an exposition of the most useful methods of variance reduction. The exposit…
Dislocation Motion in Copper Single Crystals
The characteristic motion of dislocations in copper single crystals of low dislocation density has been studied by etch pitting, especially near yield stress. Dislocations are presumed to be locked at each position in as-annealed crystals. The motion of dislocations due to the application of stress is composed of thre…
Magnetic Properties of Fe65(Ni1-xMnx)35 Ternary Alloys
Magnetic properties of Fe 65 (Ni 1- x Mn x ) 35 ternary alloys which have the f.c.c. structure over the whole range of x were investigated. It was found that the alloys are antiferromagnetic in the composition range of 1≥ x >0.3 and are ferromagnetic in the composition range of 0≤ x <0.3. In the ferromagnetic region,…
DEFORMATION PROPERTIES OF NIOBIUM SINGLE CRYSTALS
Vacuum-purified niobium crystals of various orientations have been tested in tension and compression, mainly at room temperature and 158 °K. The observed slip planes were almost always of the {101} or {211} type, and the asymmetry of the stress for slip on {211} has been confirmed at both temperatures. The critical re…
THE DEFORMATION OF NIOBIUM SINGLE CRYSTALS
Various orientations of single crystals of niobium, purified by ultra-high vacuum annealing, have been tested in compression at 295 °K and in tension at temperatures between 77 °K and 295 °K. The shear stress – shear strain curves show three-stage hardening in a manner similar to f.c.c. crystals. Analysis of the orien…
Alkali Attack of Glass Surfaces by Molten Salts
The surface reaction of soda‐lime‐silica, sodium borosilicate, soda‐zirconia‐silica, and soda‐alumina‐silica glasses with pure molten sodium hydroxide and potassium hydroxide was investigated at 350° and 425°C, respectively. Chemical durability of these glasses is assessed in terms of an acid‐base concept in which the…
Thermal Transitions in Gastropod Collagen and their Correlation with Environmental Temperature
The shrinkage temperature (Ts) in 0'9% saline of the collagen of a number of marine and terrestrial gastropods living in a wide range of temperature conditions has been examined and found to correlate with the environmental temperature of the source, i.e. the higher this environmental temperature the higher is Ts.
Tautomerism exchange in B3H7.N(CH3)3 and B3H7.-THF
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTautomerism exchange in B3H7.N(CH3)3 and B3H7.-THFMorey A. Ring, Edward F. Witucki, and R. Clive GreenoughCite this: Inorg. Chem. 1967, 6, 2, 395–396Publication Date (Print):February 1, 1967Publication History Published online1 May 2002Published inissue 1 February 1967https:…
Water Vapor Permeability of Polyethylene and Other Plastic Materials
Low-density polyethylene sheathing materials have water vapor permeabilities on the order of 10−8at 22°C. High-density polyethylenes have permeabilities about one-third to one-sixth that of the low-density polyethylene. Copolymers of polyethylene have higher permeabilities than the homopolymer. As an example, 15 perce…
THE EFFECT OF SOLUTE ON SLIP AND MECHANICAL TWINNING IN IRON ALLOYS
The effects of solute type and concentration upon the nature of, and stresses for, plastic flow in polycrystalline iron solid solutions have been examined. An extensive study was made using Al, Be, Ge, P, Si, and Sn; limited examples with Co, Sb, and Ti are also included. Three experimental observations stand out: (i)…
Complexes derived from 1,3-diiminoisoindoline-containing ligands. II. Stepwise formation of nickel phthalocyanine
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplexes derived from 1,3-diiminoisoindoline-containing ligands. II. Stepwise formation of nickel phthalocyanineThomas J. Hurley, Martin Alvin Robinson, and Samuel I. TrotzCite this: Inorg. Chem. 1967, 6, 2, 389–392Publication Date (Print):February 1, 1967Publication Histor…
DISLOCATION PILEUPS AND THE HALL–PETCH RELATION
The strength of a linear dislocation pileup depends on the nature of its barrier. Analysis is given for the case in which the barrier is a second-phase particle and for that in which the barrier is a locked dislocation with a different Burgers vector.In the first case, where pileups lie in front of hard inclusions, it…