Materials Literature
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Stator winding failures are generally attributed to groundwall or turn insulation failures. The failure mechanism involves the gradual development of a weakness in the insulation. This weakness is usually caused by a trapped void that is continuously enlarging due to ever-increasing corona or partial discharge activit…
We establish that a mode-coupling approximation for the dynamics of multi-component systems obeying Smoluchowski dynamics preserves a subtle yet fundamental property: the partial density correlation functions are, considered as matrices, completely monotone, i.e., they can exactly be written as superpositions of decay…
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Electrochemical Oxidation of CO on Pt and Ni Point Electrodes in Contact with an Yttria-Stabilized Zirconia Electrolyte: II. Steady-State and Impedance Measurements , O̸stensen Lauvstad, Gro, Tunold, Reidar, Sunde, Svein
The enantiomerically pure cis-1,2-diol 2, which is obtained by microbial oxidation of toluene, has been converted, via a sequence of reactions including high-pressure promoted Diels–Alder cycloaddition and oxa-di-π-methane rearrangement steps, into the triquinane (−)-hirsutene (1).
The objective of the present study was to investigate the adsorption of PRP-1, PRP-3 and statherin to solid surfaces in terms of dependence on concentration, the presence of electrolyte and surface wettability. Time resolved in situ ellipsometry was used to determine the adsorbed amounts and adsorption rates of pure P…
Therapeutic intervention in inflammatory bowel diseases (IBDs) is often associated with severe toxicity related to the nonspecific and ubiquitous interaction of drugs with the organs and tissues. In order to prevent side effects from aggressive and prolonged treatment with glucocorticoids and immunosuppressive agents,…
Local dissolution behavior of duplex stainless steel UNS S32304, UNS S31803, and UNS S32750 in was studied in situ by electrochemical scanning tunneling microscopy (STM). Submicrometer features could be resolved and events occurring at phase/grain boundary regions could be monitored in the solution. By STM imaging, se…
Research Article| January 01, 2002 Grazing-incidence X-ray Absorption and Emission Spectroscopy Glenn A. Waychunas Glenn A. Waychunas Geochemistry Department, Earth Sciences Division, MS 70-108B, E. O. Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California, 94720, U.S.A. Search for other works…
Tensile properties were investigated from room temperature to 673 K of a binary Mg–0.9 mass%Ca alloy where Mg2Ca phase was dispersed as lamella. The 0.2% proof stress significantly increased by the Mg2Ca phase in the temperature range investigated. It was suggested that strengthening by stable lamella Mg2Ca in the gra…
We created a model system made up of PU networks containing reactive surfactant additives in small amounts (<1%), brought in during the synthesis and able to reorient when changing the surrounding medium. The surfactants were made of fluorinated chains, sulfonamide kneecaps, and alkyl chains with a hydroxyl function a…
A series of meso-η1-platiniometalloporphyrins comprising DPP (= dianion of 5,15-diphenylporphyrin) and the first row transition metal ions Mn(III), Co(II), Ni(II) and Zn(II) has been prepared. The syntheses, spectroscopy and voltammetry as well as crystal structures of several of these derivatives are reported. The –P…
The extended use of Zircaloy cladding in light water reactors degrades its mechanical properties by a combination of irradiation embrittlement, coolant-side oxidation, hydrogen pickup, and hydride formation. The hydrides are usually concentrated in the form of a dense layer or rim near the cooler outer surface of the…
Two types of products were isolated from the reaction of NH4Se2P(OR)2 (R = Pr, Pri), Cu(CH3CN)4PF6, and Bu4NI in a 3 ∶ 2 ∶ 2 molar ratio in diethyl ether. The formulation of 1, Cu8(μ8-Se)[Se2P(OR)2]6, and 2, Cu11(μ9-Se)(μ3-I)3[Se2P(OR)2]6, was confirmed by elemental analyses, positive FAB mass spectrometry, multinucle…
A review of the current understanding of the effect of crystal lattice defects on the low-frequency dielectric relaxation properties in single crystals and polycrystalline polar dielectrics is given. Special attention is paid to different long-term phenomena, found in dielectric experiments, such as a low frequency re…
Fouling in crude oil preheat trains is a significant industrial problem which has restricted the application of process integration techniques such as "pinch technology" in this sector. A semiempirical fouling model for crude oil fouling developed by Panchal and co-workers allows the effects of fouling to be considere…
Electrodeposition of copper on activated carbon fabric was conducted in an attempt to promote the capacitance of the carbon fabric employed as electrodes in electrochemical capacitors using KOH solutions as the electrolyte. The deposition was conducted in for different lengths of time at a current density of and this…
The new non-stoichiometric mixed perovskite SrMn0.5Nb0.5O3−δ has a cubic double perovskite structure similar to that of Sr2CrNbO6 with space group Fmm (225), a = 7.9338(3) Å, V = 499.39(6) Å3 according to X-ray diffraction. The material is redox stable and maintains its structure in a reducing atmosphere. After reduci…
Carbon fibers are oxidized in two electrolytes at different electrolyte concentrations and potentials. The chemical composition of the fiber surface changes considerably in both cases. The oxidation in H2SO4 results in the formation of sulfur containing groups, but quinoidal compounds are also detected on the surface.…
Measurements of dielectric properties (a real part of dielectric permittivity and a dielectric loss tangent tan in the microwave range (0.5-2.5 GHz) at room temperature and at temperatures from room one up to 490 K at microwaves have been carried out in the BiFeO3-SrTiO3 system. Both and tan maximum values (sigma = 53…