Materials Literature
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Relations have been derived from gas analyses of irradiated PyC‐coated UO 2 fuel particles that enable the quantity of permanent rare gas (Xe+Kr) released within the particle to be predicted from known conditions of irradiation temperature, time, and burnup. The experimentally determined influence of fissions in urani…
A general theory of non-linear dielectric phenomena in liquids is proposed with the fundamental assumption, supported by a large body of experimental data, that such phenomena are specifically sensitive to molecular association processes due to electrostatic and chemical interactions. The relationships derived provide…
Consideration is given for the dielectric nonlinearity of ferroelectrics both in a strong static field with respect to the weak UHF field and in the strong UHF field. The dynamic theory of a soft mode is used as a basis for description of the phenomena. The parametric process in the strong UHF field is discussed. The…
Periodic strain waves have been studied using dilute solutions of cholesteric liquid crystals in nematic solvents. Experimental observations are in qualitative agreement with computer solutions of one constant elasticity theory. For the boundary conditions of parallel plates with homeotropic pinning of the director fi…
Description The symposium on New Approaches to Stress Corrosion was presented at the Seventy-eighth Annual Meeting of the American Society for Testing and Materials held in Montreal, Canada, 22-27 June 1975. Committee G01 on Corrosion of Metals sponsored the symposium. H. L. Craig, Jr., University of Miami, presided a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAggregation of Polyion Complexes between Synthetic PolyelectrolytesEishun Tsuchida, Koji Abe, and Masahisa HonmaCite this: Macromolecules 1976, 9, 1, 112–117Publication Date (Print):January 1, 1976Publication History Published online1 May 2002Published inissue 1 January 1976…
Low‐energy‐electron‐diffraction (LEED) intensities have been measured for the (0001), (0001̄), (101̄0), and (112̄0) faces of ZnO and analyzed using a dynamical multiple‐scattering model of the diffraction process. Atomic and ionic overlapping charge density models are used to construct the electron–ion‐core potential.…
The influence of forging schedule and subsequent heat treatment on the microstructure and mechanical properties of three α + β titanium alloys has been investigated. The alloys studied were Ti-6Al-4V, Ti-6Al-6V-2Sn, and Ti-6Al-2Sn-4Zr-6Mo. The microstructural comparisons included (α + β) finished and β-processed mater…
Abstract The changes in molecular structure of high density polyethylene which can take place during processing have been studied using a nitrogen blanketed Brabender plastograph to simulate processing conditions. At high melt temperatures (> 290°C) decreases in melt viscosity and a narrowing of molecular weight di…
The thermal diffusivity of a series of copper whiskers-copper spheres dispersed in solder was measured by the flash method at room temperature. These diffusivity values are compared with the calculated thermal diffusivity values using effective thermal conductivity values computed with Maxwell’s dispersion equation. T…
When the magnetization of a ferromagnet (in this paper “ferromagnet” will often include “fernmagnet”) is changed under the influence of an applied magnetic field, the magnetization, particularly in the vicinity of the coercive force, is not smooth function of the field but rather shows a structure composed of many ind…
Wide-line n.m.r. has been used to obtain the order parameter, S, as a function of temperature, for nematic p-methoxybenzylidine-p-n-butylaniline (MBBA) containing solutes of differing size and shape. These consisted of : (i) anisotropic molecules, capable of correlating their orientations with MBBA molecules, viz n-he…
On étudie les variations de la position énergétique des niveaux 2 P1/2(4f3), 5Do(4f 6 ) et 6P7/2(4f7) par dopage des éléments correspondants dans des matrices isomorphes, ou structuralement apparentées, à travers la série des lanthanides. On montre que lorsqu'un ion 4f N est introduit dans un solide, les paramètres de…
Comparisons of CEC and exchange acidity neasurements were made on a group of selected West African soils using three commonly used analytical procedures, namely, neutral‐acetate displacement, BaCl2‐TEA leaching at pH 8, and unbuffered KCl extraction. The three methods gave large differences in CEC values which followe…
Controlled semi‐elliptical surface flaws were produced in hot‐pressed SiC by Knoop microhardness indentation. Flawed specimens were placed in 4‐point bending in order to determine their critical stress intensity factor, K IC , at both room and high temperatures. Room‐temperature fracture and K IC values after annealin…
Description The Symposium on Thermal Fatigue of Materials and Components was presented at the meeting held in New Orleans, 17-18 Nov. 1975. The symposium was sponsored by The American Society for Testing and Materials through its Committee E09 on Fatigue. D. A. Spera, National Aeronautics and Space Administration Lewi…
The smectic properties are discussed for several series of esters which have the same “central core” molecular structure, i.e., The effects of just extending the carbon chain in a series of n-alkyl esters are discussed for the methyl to n-decyl esters of 4′n-decyloxybiphenyl-4-carboxylic acid. The effect on the inicid…
Alignments induced by short chained surfactants in MBBA are observed : tilted orientations with different tilt angles. The anchoring energies associated with this type of alignment are approximately measured. In the last section, interpretations of the rather complex mechanisms involved are proposed.
Properties of block copolymers were studied by SALS, dynamic mechanical testing, DSC, and stress-strain and dichroism experiments. Crystallization of hard segments provides a superstructure for the elastomer phase consisting of uncrystallized hard and soft segments.
All polymeric materials photodegrade to a greater or lesser extent on exposure to terrestrial sunlight in the presence of oxygen. For most commercially important polymers, some form of photo-stabilization is essential if adequate outdoor lifetimes are to be achieved. This has led to the development of many UV stabiliz…