Materials Literature
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In 1989, a 154 kV, 200 MVA gas-insulated power transformer was commissioned and has been operated with a satisfactory operating record. Utilizing this development experience and introducing new technology, a 275 kV, 300 MVA gas-insulated power transformer has been developed. The compact design of the main-gap insulati…
Na 2 HgS 2 and K 2 HgS 2 were obtained as colourless, tabular crystals by reacting the alkali sulfides Na 2 S and K 2 S with red HgS at 970 K. Both compounds are orthorhombic: Na 2 HgS 2 , oP40, s.g. Pbca with a = 18.24(2) Å, b = 7.494(5) Å, c = 7.237(5) Å, Z = 8; K 2 HgS 2 , oP20, s.g. Pbcm a = 10.697(6) Å, b = 7.958…
The structural phase transition in [N(CH3)4]2CdBr4 at 272 K has been studied by dielectric measurements. Dielectric constants along the three crystallographic axes show breaks at the transition temperature. The transition temperature increases linearly with increasing hydrostatic pressure at a rate of 0.174 K/MPa. Twi…
Several compositions were selected to investigate the formation of M phase. It was found that by reducing Fe 2 O 3 or increasing La 2 O 3 , we were able to obtain pure M phase, as deduced from X‐ray patterns, but CaO.2Fe 2 O 3 was always observed in micrographs of the polished surfaces. The instability of the M phases…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular dynamics simulations of poly(dialkylsiloxanes): conformational statistics and unperturbed chain dimensionsNeal Neuburger, Ivet Bahar, and Wayne L. MatticeCite this: Macromolecules 1992, 25, 9, 2447–2454Publication Date (Print):April 27, 1992Publication History Publ…
This study quantified the light intensity transmitted by the reflecting wedges perpendicularly to the growth axis. The results demonstrated that the cervical wedges did reflect the light of 180 degrees and original light intensity diminished by 83.9%. The maximal light intensity transmitted to the resin by the wedge w…
Abstract New polyurethane‐ graft ‐polystyrenes (4) of well‐defined structures and compositions were synthesized by macromonomer technique and the structure‐liquid‐crystalline (LC) property relationship is discussed. The expected graft copolymers with polystyrene grafts were prepared by melt polycondensation of a mixtu…
A nonlinear theory of transient patterns in the electrically induced splay Fr\'eedericksz transition in nematic liquid crystals is presented. Growth conditions for periodic perturbations with a wave vector perpendicular to the initial director alignment, superposed on the homogeneous realignment process, have ben inve…
Magnetic phase diagrams of three-sublattice perovskite-type antiferromagnets in the H-T plane are constructed. The behaviour of the magnetic susceptibility at the phase transition point is analyzed theoretically. The influence of the external field on the spectrum of spin waves is investigated in the vicinity of criti…
During the last 40 years PVC has become the most widely studied and understood polymeric biomaterial. The success of PVC compounds is due to their ability to fulfill the complex needs of the medical device industry. The range of properties they possess, which includes flexibility and low toxicity, is achieved by their…
The corrosion behavior of several high-strength aluminum alloys was characterized. The alloys were exposed to solutions of artificial seawater, some of which contained nitrate ion. Alloys were tested in the seawater solutions at room temperature and elevated temperature conditions. A unique synergism was discovered wh…
Bacterial quinones were analysed by two‐dimensional thin‐layer chromatography with ready‐made, multi‐phase silica gel plates which allowed good separation of complicated quinone mixtures. A combination of this method and silver‐ion‐modified thin‐layer chromatography made it possible to identify partially hydrogenated…
Breakdown voltage of air gaps is strongly affected by atmospheric conditions such as temperature and humidity. Detailed information on the effect of atmospheric conditions on the AC breakdown is available. However, similar data on the DC breakdown characteristics, particularly at high humidities, is scarce. DC data on…
Carburization and decarburization behavior in sodium have been examined for Fe-9Cr-Mo ferritic steels exposure to flowing sodium with containing 0.0049, 0.016 and 0.16 wppm carbon at temperatures between 723 and 873 K. The Fe-9Cr-Mo ferritic steels were more resistant to carbon transfer than 2 ¼ Cr-lMo steel. The carb…
The rheological properties of a paste containing chopped alumina fiber and particulate silica suspended in a gelled boehmite liquid phase have been evaluated using a physically based extrusion model. When sintered, the paste formed a mullite‐alumina fiber composite. Extrudates with fiber volumes up to 30% in the sinte…
The crystallography and nucleation of the Cr phase (α) from both β-Ni(Al, Ti) and γ'-Ni3(Al, Ti) in an α-β-γ' three-phase alloy are investigated using analytical electron microscopy. The α particles in β are spherically shaped and oriented parallel with the parent phase. Those in γ' are lath-shaped with a well-defined…
Abstract Kristallinitätsgrad, Kristallitgröße und Gitterstörungen von nativen und isolierten Cellulosen wurden röntgenographisch ermittelt. Der Kristallinitätsgrad und die Kristallitlänge der nativen Cellulose von Graspflanzen sind niedriger als die von Holz, Flachs und Baumwolle. Die lateralen Kristallitabmessungen d…
Oxidation of Mn2+aq by HSO5- to manganese(IV) in the presence of molybdate ion in acetate buffer involves the formation of the soluble heteropolymolybdate anion [MnMo9O32]6-. This was crystallized as K6[MnMo9O32].6H2O from the reaction mixture in the rhombohedra1 space group R 32, a 15.569(1), c 12.432(1) Å , and the…
The electrode kinetics of iron dissolution and hydrogen evolution and the corresponding corrosion rates have been determined in chloride solutions of varying ionic strengths. Correlations have been observed between these parameters and the estimated water activities in these solutions. The effect of aH2O on the iron d…
This is an investigation of the relationship between graft preparation techniques and the subsequent fate of vein grafts. Vein grafts intentionally injured by warm saline storage demonstrated endothelial and smooth muscle cell damage. In the acute postimplantation period, platelet adhesion/activation and white cell in…