Materials Literature
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Partial discharge monitoring is an effective on-line predictive maintenance test for motors and generators at 4160 volt and above, as well as other electrical distribution equipment. The benefits of on- line testing allow for equipment analysis and diagnostics during normal production. Corrective actions can be planne…
High-resolution core-level and valence band x-ray photoemission spectroscopy measurements were performed on perovskite oxide powders synthesized for applications in solid-oxide fuel cells by high-temperature solid-state reaction ( x = 0.3 and 0.19) and by room-temperature mechanical activation of the precursors ( x =…
Distortion of metal frameworks for the ceramic fused to metal technique during firing is attributed to thermal creep of the alloys. Usually thermal creep measurements are performed at constant load and constant temperature over varying time periods. Because metal frameworks for the ceramic-fused-to-metal technique are…
Zinc pyrovanadate was prepared at room temperature by using a new method, which consists of mixing zinc oxide powder, ZnO·0.3H 2 O, with a 1.5×10 –3 M solution of vanadium oxide xerogel V 2 O 5 ·2H 2 O. After a short time of stirring, the pH of the solution increases from 3.2 to 5.8 and a yellowish green precipitate w…
A porcine heart valve was irradiated by Ultraviolet (UV) rays (10 W, 254 nm) for 2, 4, 8 and 24 hours at 4 degrees C to cross-link the structural collagen matrix. The degree of cross-linking was evaluated by assaying the released amount of hydroxyproline (Hyp) from the matrix, and comparing it with the positive contro…
The optimized geometries, complete harmonic force fields, and infrared intensities of isocytosine tautomers, amino-hydroxy and amino-oxoN(1)H, were calculated at the ab initio Hartree–Fock level using the 6-31G* basis set. The theoretical force fields were scaled by empirical scale factors, which were determined by fi…
In a study on prevention of silica scale formation in geothermal applications, two silica removal methods were examined using actual geothermal brine in the Sumikawa and Onuma geothermal areas: one was the addition of silica gel seeds. The other was the addition of aluminum ions.The results for silica gel seed show th…
From measurements of the decrease in the heat (enthalpy) of transition in the solid phase by differential scanning calorimetry, the partial molar heats of solution at infinite dilution, χ, and the heats of solution or substitution, ΔHs°, of Tl+ in RbNO3 crystal and Rb+ in TlNO3 crystal along with their recovered latti…
The kinetics of oxidation by CeIV in sulfuric acid of hydrazine, hydroxylamine, nitrous acid, hydrazoic acid and of an intermediate involved in the nitrite/hydrazine reaction has been examined under a uniform set of conditions. Reaction proceeds through the free base form of the nitrogen substrate, probably by an inne…
Molecular dynamics simulations for models of poly(Vinyl Alcohol) hydrogels and pure water have been carried out over a wide temperature range including the glass transition temperature to examine structure and dynamics of supercooled water in hydrogels. The temperature dependences of thermodynamic properties and rotat…
The Martin-Siggia-Rose (MSR) functional integral technique is applied to the dynamics of a D - dimensional manifold in a melt of similar manifolds. The integration over the collective variables of the melt can be simply implemented in the framework of the dynamical random phase approximation (RPA). The resulting effec…
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Nickel metal hydride ( N i M H) rechargeable battery technology i s currently the major competitor to well-established nickel c a d m i u m ( N i C a d) technology D u e to new legislation in the European U n i o n and elsewhere, N i C a d cells are gradually being replaced to reduce the use of toxic cadmium, and N i…
Previous researchers have shown, using FFT spectrum analyzers, that arcing causes a significant increase in the third harmonic content of the leakage current of polluted insulators. This paper investigates the feasibility of using modern high resolution digital spectral analysis methods to obtain better spectral estim…
A series of strain-controlled fatigue tests were performed on 0.1 wt% C Fe-C alloy samples under different strain amplitudes. The measured coercivity of these samples was found to behave differently in the initial and final stages of fatigue. In the intermediate stage of fatigue it was found that coercivity tended to…
The structure of lead-silicate glasses, although being investigated for over sixty years, remains still controversial. One of the open questions is the structure of the lead subsystem: what are the basic structural units like, and how are they interconnected. In the literature the appearance of [PbO 4 ] n , or [PbO 3…
We have constructed a simple and sensitive tool for the measurement of magnetostriction of thin films. This tool is based on a commercial nano-indentation system, which enable the measurement of the elastic properties of small samples, such as thin films and precipitates, as well as the magnetostrictively induced defl…
The technique of domain visualisation, revealed by a film of nematic liquid crystal (NLC) on a ferroelectric crystal substrate, is demonstrated for the first time to be applicable to thin films of lead zirconate-lead titanate (PZT) ferroelectric ceramics. PZT film thicknesses <1 µm were deposited on indium tin oxide c…
Nickel(II)-meso-octaethylporphyrinogen dianion behaves as a π-extended ligand binding four M(CO)3 [M = Cr, Mo] fragments at the periphery, so that the porphyrinogen can assemble five metal centers around itself.
Initialization, which is to erase the non-uniform surface potential of an insulator, is important for reproducible observation and interpretation of the contrast mechanism of negative charging. When primary electrons with an accelerating voltage (whose secondary emission yield is larger than unity) irradiate the surfa…