Materials Literature
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Bacteroides oulorum, a new nonpigmented, saccharolytic species from oral cavities, is described. This species differs both biochemically and chemically from related taxa, such as Bacteroides oralis, Bacteroides buccalis, Bacteroides denticola, Bacteroides veroralis, and Bacteroides pentosaceus. The major fermentation…
Abstract A series of tetrasilicic Na-micas with variable layer charges (x) between x=1 and x=0.32, NaxMg3−xLix(Si4O10)F2, was synthesized. The expansibility of the synthesized Na-micas upon swelling increased with decreasing layer charge.
Article Zielpräparation zum transmissionselektronenmikroskopischen Nachweis der Phase Al3Fe (Θ-Phase) auf tauchaluminiertem, niedriglegiertem Stahl / Target Preparation for the Transmission Electron Microscopic identification of the Al3Fe (Θ-Phase) in Hot-Dip Aluminised Low Alloyed Steel was published on April 1, 1985…
This paper considers the available evidence for relationships between grain boundary structure and diffusion. In any one material the boundary structure is a function of geometry, solute segregation and, in the case of compounds (e.g. oxides), non-stoichiometry. The effect of these parameters on boundary diffusion in…
We have investigated the influence of surface plasmon polaritons (SPP’s) on the reflection spectra of Ag-Al2O2-Al and Al-AL2O2-Al junctions in the visible range. The SPP’s were excited via sinusoidal grating structures. The SPP photon coupling efficiency was optimized as a function of the grating modulation height and…
The fracture behaviour of a series of austenitic high chromium cast irons (15%Cr and 2.7% C) containing a constant volume percentage of M7C3 eutectic carbides in distributions that, varies from continuous network to isolated globules was studied.The modification of the eutectic carbide morphology was achieved by the a…
The central practical problem which has impeded the development of the valence-bond theory of molecular electronic structure for the past fifty years has been the so-called nonorthogonality problem. In this article we develop a new method for calculating electronic energy matrix elements between Slater determinants co…
Two toxic principles of Kalanchoe daigremontiana were isolated and structurally elucidated as bufadienolides with an unusual substitution pattern. Daigremontianin, a novel compound, and bersaldegenin-1,3,5-orthoacetate which was also found in Kalanchoe tubiflora Hamet, show a pronounced sedative, positive inotropic an…
Stress corrosion cracking (SCC) behavior of two 13Cr steels was investigated in aqueous CO2-H2S environments. U-bend tests, constant load tensile tests, and corrosion tests were performed in CO2 environments containing different amounts of H2S. In addition, the slow strain rate tensile (SSRT) tests and hydrogen absorp…
Measurement of the dielectric permittivity ε33, the pyroelectric coefficient p3 and the piezoelectric planar coupling kp and frequency constant Np in single crystal Ba2TiGe2O8 show clear evidence of a heretofore unobserved first order phase change which occurs at - 50°C on cooling and near 0°C on heating. The balance…
Abstract Kinetics of the reaction between bis(4‐isocyanatocyclohexyl)methane, H‐MDI, and n ‐butanol was studied in toluene at 100°C. Effects of various catalysts, such as Hg(CH 3 COO) 2 , Zn(CH 3 COO) 2 · 2H 2 O, SnCl 4 · 5H 2 O, and dibutyltindilaurate on the reaction rate and kinetics were also investigated. Reactio…
Abstract not Available.
A phcnomenological theory, based on the Landau-Ginsburg-Devonshirc formalism is developed to explain phase transitions in perovskite ferroelectrics with oxygen octahedron tilts. In this approach, the Gibbs free energy function is expanded as a power series involving polarization and tilt angle as order parameters. Aft…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe ligand field of phase-coupled ligatorsA. Ceulemans, M. Dendooven, and L. G. VanquickenborneCite this: Inorg. Chem. 1985, 24, 8, 1153–1158Publication Date (Print):April 1, 1985Publication History Published online1 May 2002Published inissue 1 April 1985https://pubs.acs.org…
Shrinkage of 20 different cotton knit fabrics was followed over ten cycles of relaxation using two methods of relaxation. The first method used a standard washing and tumble drying procedure, while the second used washing for only the first cycle; for the second and subsequent cycles, fabrics were merely wet out by ri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures and magnetic and EPR studies of intradimer and interdimer exchange coupling in [M(en)3]2[Cu2Cl8]Cl2.cntdot.2H2O (M = Co, Rh, Ir) crystalsS. K. Hoffmann, Derek J. Hodgson, and William E. HatfieldCite this: Inorg. Chem. 1985, 24, 8, 1194–1201Publication Date…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOlefin isomerization catalysis by heterobimetallic hydrides, HFeM(CO)8L- (M = Cr, Mo, W; L = CO, PR3)Patricia A. Tooley, Larry W. Arndt, and Marcetta Y. DarensbourgCite this: J. Am. Chem. Soc. 1985, 107, 8, 2422–2427Publication Date (Print):April 1, 1985Publication History P…
The basic principles used to design infrared transmitting glasses are briefly explained. The composition and properties of oxide, halide, and nonoxide chalcogenide glasses show the utility and limitations of these materials for infrared applications. In general, glass systems with an infrared absorption edge at longer…
The temperature dependence of the refractive index n of cubic crystals undergoing phase transitions (PT) is measured with an accuracy of the order δn=10−6 at temperatures between 3.5 and 1000 K with a computer-controlled Jamin–Lebedeff interferometer. Microscopic monitoring for in situ sample orientation and single do…
Dose rates have been measured at 0.1 m, 0.5 m and 1.0 m from patients in a Nuclear Medicine Department. Data are presented for a variety of Nuclear Medicine procedures using doses of radiopharmaceuticals within the recommendations of the administration of Radioactive Substances Advisory Committee (ARSAC). The correspo…