Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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…
Abstract Crystalline citrate synthase (citrate oxalacetate lyase (coenzyme A-acetylating) EC 4.1.3.7) has been prepared from rat kidney and rat brain. These enzymes are homogeneous as judged by acrylamide gel electrophoresis, and immunologically identical with the rat heart citrate synthase. Steady state kinetic studi…
Changes occurring in the chemical state, and the crystallographic and electronic structure of LaCoO3 in a reducing atmosphere were determined. These determinations involved the use of thermogravimetric and calorimetric techniques, x-ray diffraction, and magnetic property measurements. It was shown that the reduction p…
Skew scattering by magnetic impurities in dilute magnetic alloys induces an extraordinary Hall effect which has now been observed in many systems. The author calculates the extraordinary Hall effect induced by cerium impurities for which the conduction electron-impurity interaction is mainly due to resonant scattering…
A molecular theory for distortional plasticity is described based on thermally activated production of molecular kink pairs which incrementally align short molecular segments and thereby produce strain. The process of crazing is described as a micromechanical problem of elastic-plastic expansion of initially stable mi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of a new hexamolybdate-cyclophosphazene complexH. R. Allcock, E. C. Bissell, and E. T. ShawlCite this: Inorg. Chem. 1973, 12, 12, 2963–2968Publication Date (Print):December 1, 1973Publication History Published online1 May 2002Published inissue…
The range of the intrinsic nonstoichiometry in lead zirconate-titanate at 1100 °C has been established independently by two gravimetric techniques. A modified Knudsen effusion experiment allowed for an extended interpretation of the vapor pressure data. A single experiment was used to determine the width of any Pb1−x…
An instability mechanism for a pile-up of perfect screw dislocations is investigated where the cross-slip barrier is that of the Peierls-Nabarro force. The pile-up is found to reach a state of unstable equilibrium under the condition τ* = 0.66(μs)1/2, where τ* is the tip stress of the pile-up, μ the shear modulus, and…
Abstract Far infrared spectra of K3[Co(CN)6] and [Co(NH3)6][Co(CN)6] and a single crystal Raman spectrum of K3[Co(CN)6] have been measured. Calculations of optically active crystal vibration frequencies have been made, on the basis of the crystal structure determined precisely. For these two types of established cryst…
Liquid crystals may be classified in two major categories, namely, thermotropic and lyotropic. Thermotropic liquid crystals are commonly prepared by heating organic compounds, whereas lyotropic liquid crystals are made by mixing two or more components. Thermotropic liquid crystals are mainly of interest in this paper.…
A finite-element elastic analysis is made of a skull. Measurements were made of the geometry and thickness of a skull. The skull was then idealized with a doubly curved and arbitrary triangular shell element. Results suggest that the skull is well built for resistance to front loads. The importance of using a composit…