Materials Literature
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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…
Better understanding of soil aluminum has had dramatic effects on the interpretation of many aspects of soil chemistry. Aluminum is a Group III element, metallic in nature, and exhibits both ionic and cuvaient bonding. It is the most plentiful of all metallic cations of the earth's crust. It is released from octahedra…
I M Ward (ed) London: Applied Science 1915 pp xv + 500 price £18 In the main, the scope of this book and its coverage of the various aspects of the subject do justice to the title. However, it is a little disappointing that consideration of high-modulus forms of oriented polymers is virtually confined to the aromaticp…
Description An absolute must for anyone in the nuclear industry. Twenty-nine papers cover irradiation creep and stress relaxation; simulation; and embrittlement of pressure vessel steels, as well as mechanical properties, microstructure and void growth.
Abstract The scattering law S ( k , w ) for dilute polymer solutions is obtained from Kirkwood's diffusion equation via the projection operator technique. The width Ω( k ) of S ( k ,w) is obtained for all k without replacing the Oseen tensor by its average (as is done in the Rouse–Zimm model) using the “spring‐bead” m…
Single crystals of pure copper oriented for single slip were fatigued to saturation at low constant plastic strain amplitude. A weak-beam study of the dislocation microstructures revealed a very high density of dipoles in both the ‘wall’ and ‘matrix’ structures. Secondary dislocations were not observed
Abstract As part of a wider study on the crystallization of isotactic polystyrene solutions it was observed that at sufficient concentrations (> 3–5%) gelation sets in below a certain (very high) supercooling in competition with the usual single crystal formation which in itself produces turbid suspensions. It was…
The well-known effects of dissolved oxygen and hydrogen in respectively increasing and reducing the corrosion rate of zircaloys irradiated in high temperature water have been attributed to changes in the course of water radiolysis.1 Computer simulation of the growth and decay of radioly tic species produced by β, γ an…
Tension and Charpy V-notch specimens of the base metal, heat-affected zone metal, and weld metal from the beltline region of the Maine Yankee pressure vessel (Type A533B-1 steel) were irradiated in an accelerated surveillance capsule. The specimens were exposed to a fluence of 1.3 × 1019 neutrons (n)/cm2 (>1 MeV) at 5…
Potential-pH curves for electrodeposited 80% Sn-Cu alloy in aerated buffer solutions of pH values ranging from 0.9 to 11.3 show linearity within the range of pH 4.4 to 11.3. The electrode behavior is governed by the Sn(OH)4/Sn(OH)2 system. For the deaerated buffer solutions, the bheavior of the alloy coincides approxi…