Materials Literature
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Textural and compositional features of reaction products in the system kaolin–lime–water were examined by electron microscopy and electron diffraction. Electron micrographs of replicas of fracture surfaces of compacted mixtures and transmission electron micrographs of powdered compacts showed considerable attack of ka…
This is an overall study of the whole process of projectile penetration into soil. The governing differential equations for the soil target medium are developed using the equations of motion and the continuity condition. Constitutive relationships are derived from Mohr-Coulomb theory for a rigid plastic material and f…
Exchange-coupled F-centre pairs have been observed in neutron-irradiated magnesium oxide by paramagnetic resonance. Studies of the temperature dependence of the signal intensity indicate that the exchange energy J/k = 80 ± 10°K. The measured spin-Hamiltonian parameters are consistent with the pair of F centres being i…
Calculations of the diffraction contrast to be expected from spherical precipitates and prismatic dislocation loops are reported. If these defects lie close to a foil surface, the effect of the free surface on the image is important. In each case, there exists a certain critical strength of the defect, such that if th…
Abstract Auf Grund vielfach eigener Untersuchungen wird berichtet über: Bildungsbedingungen, Phasenbestände und Epitaxie‐Topotaxie‐Beziehungen von Schichten der atmosphärischen Korrosion, des Angriffs durch Industrieluft mit ihren vielfältigen Reagenzien, des Salzwasser‐, Heißwasser‐ und Heißdampfangriffs und der Hoch…
The thermal conductivity, electrical conductivity, and Seebeck coefficient of several specimens of SnTe have been measured between 100° and 500°K. The thermal conductivity is weakly dependent on both temperature and hole concentration. The total thermal conductivity is separated into an electronic and a lattice therma…
Abstract Using X-ray techniques, the orientation distributions of crystal planes in laboratory prepared and naturally occurring aggregates were measured. A small specimen was mounted on the axis of a goniometer and the diffracted intensity measured as the specimen was rotated. Mo radiation was used to reduce the absor…
Abstract Die thermische Darstellung der Verbindungen 2BaO · P 2 O 5 · B 2 O 3 und 2BaO · As 2 O 5 · B 2 O 3 wird beschrieben. Sie sind isotyp mit den früher beschriebenen analogen Calcium‐ und Strontiumverbindungen und schmelzen wie diese inkongruent. Die röntgekristallographischen Daten der nunmehr bekannten 6 Verbin…
Summary: The cell walls of six different species of algae were prepared in highly purified form and their amino acid and amino sugar contents determined qualitatively. A limited number of ninhydrin-positive components was found, implying that the walls contain peptide rather than protein. In five of the algal walls, t…
A study was made of the EPR and optical spectra of trivalent erbium in Type II crystals of calcium fluoride. The EPR spectrum disclosed the existence of cubic, tetragonal, and trigonal sites in the approximate ratios 15:20:1. The splitting values agreed with those of Ranon and Low. The optical spectrum consisted predo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrigonal Bipyramidal Complexes of Bivalent Manganese, Iron, and Zinc with Tris (2-dimethylaminoethyl)amineM. Ciampolini and N. NardiCite this: Inorg. Chem. 1966, 5, 7, 1150–1154Publication Date (Print):July 1, 1966Publication History Published online1 May 2002Published iniss…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Abstract After recalling the reaction mechanism suggested for the crosslinking of ethylene propylene copolymers with organic peroxides, the authors consider the relation between concentration of curing agent and crosslink density. It is experimentally found that, as a first approximation, the elongation ratio at break…
The principal interaction between dislocations and the direction of magnetization in ferromagnets is due to the magnetoelastic (magnetostrictive) effect. After a brief historical survey, the following subjects are considered : I. The approach to ferromagnetic saturation. Susceptibility measurements in this range const…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Promotion of a Nickel Catalyst by Electronic Interaction with Germanium SupportsRaymond F. Baddour and Max C. DeibertCite this: J. Phys. Chem. 1966, 70, 7, 2173–2181Publication Date (Print):July 1, 1966Publication History Published online1 May 2002Published inissue 1 Jul…
Abstract The fatigue life of natural rubber-HAF black vulcanizates showed maxima when plotted as a function of crosslink concentration as did other properties related to a tearing process such as tensile strength, crack growth, and tear strength. Accelerated-sulfur vulcanizates were superior to peroxide and nonelement…
Many electron micrographs showing various lattice images were obtained from single crystal gold films. Many of them showed more than two sets of lattice images side by side or/and crossing to each other, e.g. (200), (020) and (220) crossing to each other. To obtain such images the crystal must be oriented so that Brag…
An analysis of the thermal conductivity of polymethyl methacrylate is presented which fits the experimental data to better than 10% from 1°K to the glass temperature. The model employed is a slight modification of Klemens' theory of the thermal conductivity of amorphous substances in which explicit account of the fibr…
SUMMARY Heating of cellulose (purified cotton and cuprammonium‐regenerated cellulose) under nitrogen in the presence of liquid water at 100° and at 150°C brought about a small amount of hydrolysis and some dehydration, the extent of which was directly proportional to the temperature. Heating in the absence of water ca…
Abstract Some earlier observations on the influence of molecular weight, plasticizer, and irradiation on the thermal conductivity of polymers is reviewed. Also some new data on polystyrene and some new calculations based on the theory of Hansen and Ho are presented. These data show almost a two fold increase in the th…