Materials Literature
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Three powder mixtures, each composed of four or more phases, were submitted for phase identification by x-ray diffraction. Laboratory technicians supplied tables of “d” values and of relative intensities as obtained separately and independently by use of the diffractometer, the Debye camera and the Guinier camera. The…
“Blue brittle” or dynamic strain-aging studies were carried out on mild steel in vacuum-annealed, irradiated, and irradiated decarburized conditions. The effect of neutron damage is to decrease or eliminate the concentration of free interstitial impurity elements responsible for locking the dislocations. Progressively…
Although numerous developments have been reported on how starch can be used to make plastics, these have failed to achieve large-scale market reality, largely because better and lower cost plastics can be made from other raw materials, particularly petroleum. Decreasing availability and increasing prices of convention…
The electronic structure of ABO3 cubic perovskite-type oxides are determined by a modified tight-binding method. The imaginary part of the dielectric constant ε2 and the moments of ε2 provide a quantitative interpretation of optical data. Constant energy surfaces near the conduction band minimum are warped spheres. Th…
Abstract New polyols of high hydroxyl content and reactivity were made from linseed and soybean oils and acids by catalytic carboxylation followed by reaction with diethanolamine. Urethane foams made with these diethanolamides were stronger than those made with castor oil at equivalent polyol wt. Because of their high…
Mechanism of thermophily has been the object of biochemical interest for many years, but has not been clearly answered at the molecular level. Most of the studies have been done using a moderate thermophile, Bacillus stearothermophilus which grows optimally at 60–65°C. Studies on more rigorously thermophilic bacterium…
Hydriding alloys based on the intermetallic compound FeTi have potential for the safe and convenient storage of hydrogen, both for mobile and stationary applications. Optimum technical and economic use of these alloys requires an understanding of the physical metallurgy of the system and its relation to the hydriding…
Abstract Samples of plinthic horizons from five soil series were collected in the Southern Coastal Plains Province of Georgia. Plinthite and various colors of soil material in each horizon were separated and analyzed for particle size distribution, Fe 2 O 3 content, and mineralogy. Iron segregation is greater in plint…
Thermoplastische Spritzgußteile weisen eine außerordentlich starke Inhomogenität und Anisotropie der Formteileigenschaften auf. Die Inhomogenität ist über dem Formteilquerschnitt wesentlich stärker ausgeprägt als längs des Fließwegs. Die Verarbeitungsbedingungen beeinflussen die innere Struktur erheblich. Daher ist es…
The binary glasses were prepared in the SiO2-PO5/2 system containing 0-64.2 and 95.7-100mol% PO5/2, and in the GeO2-PO5/2 system containing 0-48.8mol/ PO5/2.In the binary SiO2-PO5/2 glasses the transformation temperature (Tg) and the Vickers microhardness (Hv) decreased sharply up to about 30mol% PO5/2 because of intr…
Coupling agents are primarily used to: (a) promote adhesion between the adherends and adherates1 or reinforcing media in the case of composites; (b) maintain improved adhesion as a function of aging; and (c) protect against the deleterious effects of water and corrosive environments. Silanes are the most commonly used…
The anisotropy measurement combined with magnetic measurement and electron microscopy is performed on monocrystalline Alnico alloys with various contents of Ti and Co, to examine the effects of these constituents, especially of Ti, upon the high coercivity in Alnico alloys. The shape anisotropy constant, Ku* increases…
The behaviour of interstitial atoms of light elements in the iron lattice are discussed and classified, particularly in regard to their influence on the bonding nature of the iron lattice and their tendency of formation of platelet clusters. According to this general consideration the stress induced clustering of hydr…
A non-linear least squares technique was used to determine k 11, k 33, ε1 and ε2 by comparing data from a single birefringence vs. voltage experiment. Liquid crystal optical cells with parallel orientation were used to generate the birefringence-voltage curve from which the parameters were determined. Cell thickness w…
A topic of intense interest to polymer morphologists in the past few years is the phenomenon variously called row nucleation or oriented crystallization (from a stressed melt) and shish-kebab crystallization (from stirred solutions) [1–4]. The phenomenon can be characterized as the formation of a fibrillike nucleus, p…
Abstract—The cationic polymerization of heterocyclic monomers may lead to polymers containing substantial, yet Variable amounts of cyclic oligomers. This review gives a survey of the systems where such oligomers have been found. Oligomer formation is generally observed in the polymerization of oxiranes and thiiranes.…
The diatom flora of the cavern system of Timpanogos Cave National Monument was investigated. Diatoms were found throughout the cave system and were distributed according to moisture and natural openings. Twenty‐six species were identified and described, including eight not previously collected from caves and four new…
It is shown that the difference in the free energy of activation for atoms diffusing in the lattice and in the grain-boundary is precisely the absolute grain-boundary energy. The self-diffusion data in Au in the lattice and along the grain-boundaries yielded excellent values of grain-boundary energies as a function of…
In order to determine the oxygen coordination numbers of Fe ions in the melts, Mössbauer spectra of Fe ions in silicate and posphate glasses have been measured and the distributions of Fe3+ (tetr.) and Fe3+ (oct.) in CaO-SiO2 or Na2O-SiO2 systems have been calculated. The results indicate that the ratio of Fe3+ (oct.)…
The influence of age and of corticosteroid treatment on viscoelastic properties of skin samples has been studied in rats. Hysteresis curves were evaluated with increased extension for each cycle. Maximum stress and modulus of elasticity were increased by age and by 10 days' prednisolone treatment. However, hysteresis…