Materials Literature
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Powder preforms of zirconia, containing 2.85 mol% yttria, were sinter‐forged in simple uniaxial compression at 1400°C by applying constant displacement rates to the specimens. Shear and densification strains and the uniaxial stress were measured as a function of time. In contrast with alumina and silicon nitride, zirc…
A new method for the molecular-dynamics simulation of bulk planar interfaces at high temperatures is presented. The method uses the basic Parrinello-Rahman (constant-stress) scheme, modified for the application to inhomogeneous systems. Since our computational cell contains only one interface with two-dimensional (2D)…
It was demonstrated recently that, in contrast to large cerebral arteries, distensibility of cerebral arterioles is increased in stroke-prone spontaneously hypertensive rats (SHRSP). The goals of this study were to examine composition of normal cerebral arterioles, and to determine whether chronic hypertension alters…
Myristoyl-CoA:protein N-myristoyltransferase (NMT), the enzyme that transfers the myristoyl (14:0) moiety from myristoyl CoA thioester to nascent proteins, is remarkably specific for both peptide and fatty acyl CoA substrates. To investigate the interaction of NMT with fatty acyl CoA substrates, we have synthesized 10…
The isotropic–nematic phase transition is investigated for several model liquid crystals using the density functional method. The models considered are hard ellipsoids of revolution (both prolate and oblate cases), hard spherocylinders, and two additional fluids characterized by pair potentials of a generalized Maier–…
Clearly distinguishable are the VIV and VV centers of the “outer shell” of the title anion 1, whose center forms a VO4 tetrahedron and a μ3-O atom. The nine μ2-O bridges between VIV centers (black) are protonated, the six between VIV and VV centers (hatched), on the other hand, are not. The formation of 1 confirms the…
The histidine permease of Salmonella typhimurium consists of four protein components, one located in the periplasm and three in the cytoplasmic membrane. Genetic evidence indicated that the periplasmic protein interacts with the membrane proteins during transport. We have utilized two different methods to demonstrate…
Abstract Anodic TiO 2 films were grown on titanium subhydride samples under galvanostatic conditions. The samples were heat treated at temperatures between 550 and 600°C and changes in the profile of oxygen concentration as a function of depth were monitored using Auger electron spectroscopy (AES). For TiH 0.87 and Ti…
SUMMARY Surface soil samples from seven profiles from the central plains of Sudan were investigated using XRD, chemical analysis and Mössbauer spectroscopy measured at 15K. Dioctahedral montmorillonite was the main constituent with different proportions of kaolinite and chlorite. Goethite was found as fine iron oxyhyd…
Abstract Criddleite, ideally TlAg 2 Au 3 Sb 10 S 10 , is a rare constituent within the Hemlo gold deposit, Hemlo, Ontario, Canada. The mineral occurs as 20 to 50 µm-sized lath-like, tabular or anhedral grains usually surrounding or penetrating aurostibite, or associated with native antimony, native gold and stibnite.…
Abstract Trigonal CdSb 2 O 6 , prepared as a very crystalline powder by solid state reaction of CdO and Sb 2 O 3 , is isostructural with PbSb 2 O 6 Space Group (S.G.) P31m (162), with a = 5.2399(2), c = 4.8045(4) Å, Z = 1 and D c = 6.57 Mg.m −3 . For the refinement of structural parameters from X-ray powder diffractio…
São apresentados os resultados do estudo do fitoplâncton e de algumas variáveis físicas e químicas da água em um trecho do Rio Jacuí, com base em amostragens realizadas em julho de 1986. As coletas foram efetuadas em três secções do rio, incluindo, além da área de influência direta de efluentes industriais, ricos em r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational and electronic spectra of tetrakis(formato)diruthenium(1+)Vincent M. Miskowski, Thomas M. Loehr, and Harry B. GrayCite this: Inorg. Chem. 1988, 27, 26, 4708–4712Publication Date (Print):December 1, 1988Publication History Published online1 May 2002Published iniss…
The temperature dependence of the lattice parameter a of the powder samples of the mixed spinels Zn1− xCuxCr2Se4 was measured in the temperature range 100–570 K by the X-ray powder diffraction technique. The temperature dependence of the magnetostriction was observed from these results. For x = 1.0, 0.9, 0.8, 0.3 and…
The nucleation fields of sintermagnets are determined on the basis of micromagnetism taking into account the deteriorating effects of local stray fields, misaligned grains and reduced anisotropy constants of grain surfaces. It is shown that the nucleation hardening model gives a coherent description of the outstanding…
The saturation magnetization, 4πMs, and the magnetostriction constant, λ, of Ni81Fe19, Ni81Fe19/Ta and Ni72Fe17Rh11/ Ta thinfilms were studied as a function of film thickness before and after annealing. For films of thickness t < 200 Å, 4πMs, and λs were found to be strongly dependent on film thickness with even large…
C. L. Sanders, K. E. McDonald, K. E. Lauhala, Promotion of Pulmonary Carcinogenesis by Plutonium Particle Aggregation Following Inhalation of ${}^{239}{\rm PuO}_{2}$, Radiation Research, Vol. 116, No. 3 (Dec., 1988), pp. 393-405
Traditional environmental cracking test methods such as the NACE tensile test or the MgCl2 test have limitations for extreme sour service materials evaluation. The slow strain rate test (SSRT) method overcomes many of the disadvantages of more traditional test methods, while still posing some unique questions of its o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of a polymer surface containing covalently attached triethoxysilane functionality: adhesion to glassKang Wook Lee and Thomas J. McCarthyCite this: Macromolecules 1988, 21, 12, 3353–3356Publication Date (Print):December 1, 1988Publication History Published online1 M…
The crystalloid structure, an aperiodic arrangement of small structural units, observed in Ni-Cr small particles was studied by selected-area electron diffraction, dark-field imaging, high-resolution electron microscopy and optical diffraction analysis using the high-resolution micrographs. The electron and optical di…