Materials Literature
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Thermal expansion and/or specific heat and/or dynamic mechanical loss data reveal the presence of two glass-like transitions in bulk crystallized polyethylene, polypropylene, polybutene-1, polypentene-1, cis-and trans-polyisoprene (natural), poly-4-methylpentene-1, isotactic polystyrene, poly(vinyl alcohol), nylon 6,…
High-field magnetization studies were made from 4 °K to room temperature on rapidly sputtered TbFe2, DyFe2, and SmFe2. At 4.2 °K the magnetic moment resembles that of polycrystal samples, whereas at room temperature it is substantially lower. Huge coercive forces (20–30 kOe) were observed at 4.2 °K. Partial crystalliz…
Abstract Experimental results on the reduction of compacted pellets of the chlorides of cobalt and nickel are reported. The kinetics of the processes are considered in the light of the chloride vaporization mechanism previously proposed to account for the reduction of ferrous and chromous chlorides. Although all these…
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 L'auteur a pu obtenir les fréquences des vibrations actives en diffusion Raman du chlorure de magnésium hexa‐amminé hydrogéné et deutérié à l'état cristallisé. Toutes les vibrations attendues ont pu être observées pour la première fois pour un composé de ce type (vibrations internes et vibrations externes). L…
Sulfate uptake and the cellular levels of three sulfonic acids, cysteinolic acid, sulfopropanediol, and the plant sulfolipid, were followed using 35S-sulfate labeled cells of the diatom Navicula pelliculosa in silicate starvation synchrony, sulfur deficiency, and chase experiments. Sulfate uptake was nearly completely…
The x-ray induced photoemission measurements made at AFCRL have been used as a basis for comparison to the computed results of the POEM Monte Carlo electron transport code. The results show spectral shapes which closely resemble the experimental data and absolute yield values which agree within 15-27%. The measurement…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdvances in Polyurethane Coatings (1969 to Early 1972)Wen-Hsuan Chang, Rogers L. Scriven, John R. Peffer, and Samuel Porter Jr.Cite this: Ind. Eng. Chem. Prod. Res. Dev. 1973, 12, 4, 278–288Publication Date (Print):December 1, 1973Publication History Published online1 May 20…
Abstract The oxidation of sodium thiosulfate with ozone in an aqueous solution was investigated as a part of a series of studies on the chemical behavior of such low-valence sulfur compounds as thiosulfate and sulfite. The ozone oxidation was carried out by blowing a mixed gas of ozone and oxygen continuously into a 0…
Response and geometrical factor of a charged particle energy spectrometer are presented. Both a theoretical and an experimental approach are used. A set of two annular curved deflection plates constitutes the energy analyzer of the spectrometer. The analyzer has the features of large geometrical factor, high angular a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMass spectrographic determination of hydrogen thermally evolved from uranium and uranium alloysG. L. Powell and J. B. CondonCite this: Anal. Chem. 1973, 45, 14, 2349–2354Publication Date (Print):December 1, 1973Publication History Published online1 May 2002Published inissue…
On a effectué des expériences de fluage à, haute température sur des monocristaux de magnésium sollicités en compression suivant l'axe c. L'examen des échantillons déformés en microscopie électronique révèle que la déformation du cristal est due à, la montée pure de dislocations de vecteur de Burgers c situées dans le…
High-temperature X-ray diffraction methods have been used to determine unit-cell parameters of two boron carbide compositions from 12° to about 940°C. One composition was at the carbon-rich end of the phase field (i.e. B4C), the second at the boron-rich end (5 at. % C by chemical analysis). The lattice expansion of bo…
Even-tempered atomic orbital bases are formulated which have the property that atomic orbital scaling can be closely simulated through variation of linear expansion coefficients. This ``adaptation to pseudoscaling'' involves two types of adjustments: (1) Optimal orbital exponents and basis sizes are determined for the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and magnetic characterization of .mu.-hydroxobis[pentaamminechromium(III)] chloride monohydrate, the acid rhodo chloride complexJack T. Veal, David Y. Jeter, Judith C. Hempel, Richard P. Eckberg, William E. Hatfield, and Derek J. HodgsonCite this: Inorg. Chem. 197…
The power loss and flux distribution in two commercial T-joints have been compared. The simple 45°-90° T-joint and the slightly more complex 45° offset T-joint were chosen for the investigation, as they are the most common joints currently used in power transformers. The localized and overall power loss of each joint…
The thermoelectric power and resistivity of annealed copper films have been measured. From the thermoelectric power values at the minimum in resistivity and the corresponding temperature coefficient of resistance, the calculated values of the energy dependence of the mean free path of conduction electrons and the Ferm…
Subsolidus equilibria along the CaMgSiO.-Mg,SiOn olivine join are governed by partial immiscibility between the end-member phases. The solvi bounding the two-phase region are determined over the temperature range 800-1300'C at 2, 5, and 10 kbar. Within the limits of experimental error, the two-phase data are symmetric…
(1973). Relation between physical and chemical processes on semiconductor surfaces. C R C Critical Reviews in Solid State Sciences: Vol. 4, No. 1-4, pp. 515-539.
We report a study of the morphology and kinetics of crystallization of films of a-Se vapor deposited on mica substrates. Morphological examination was facilitated by the complete dissolution of the amorphous component of the films by CS2, while the crystalline component was left essentially intact. Crystallization beg…