Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBand electronic structure of the lithium molybdenum purple bronze Li0.9Mo6O17Myung Hwan. Whangbo and Enric. CanadellCite this: J. Am. Chem. Soc. 1988, 110, 2, 358–363Publication Date (Print):January 1, 1988Publication History Published online1 May 2002Published inissue 1 Jan…
Reaction of [MoCl4(NNMePh)] with (Bun4N)2[Mo2O7] yields a co-ordination complex with the hexanuclear oxomolybdate core, (Bun4N)2[Mo6O18(NNMePh)]; the reaction is general with appropriate precursors in providing a ready entry into the class of co-ordination compounds of the types [Mo5O18(ML)]n– and [W5O18(ML)]n–, with…
Aimed at both the novice and the experienced scientist, this mini-encyclopedia describes over 100 materials methodologies, including evaluation, chemical analysis, and physical testing techniques. Each technique is presented in terms of its use, sample requirements, and the engineering principles behind its methodolog…
Four new pregnane glycosides, named periplocosides J, K, F and O, have been isolated from the antitumor fraction of Periploca sepium (Asclepiadaceae). Their structures were established by various nuclear magnetic resonance techniques and chemical evidence.
During the past 50 years, the 90–10 iron modified cupronickel alloy (CA706) has been developed extensively for marine and offshore applications. It has proved to have good corrosion, erosion–corrosion, and fouling resistance to sea water. The behaviour and protection mechanism of the alloy in these environments has be…
Les supports sont la gomme d'acacia,les dextrines et les maltodextrines. La mesure de la viscosite, l'observation de la forme et des dimensions des globules en microscopie electronique et l'etude de la composition de l'huile par chromatographie phase gazeuse-spectrometrie de masse sont effectuees pour chaque matrice e…
Poly(ethylene oxide) (PEO) adsorbed on small silica (ludox) particles was studied by means of dynamic light scattering, as a function of segmental binding strength (pH). The results show that the hydrodynamic layer thickness δ h is constant or increases slightly with pH up to pH ~ 10.5 and then drops sharply to zero.…
Abstract Electrochemically partially‐oxidized Cu specimens are transferred from the electrolyte (pH 13 and 14) within a closed system without air contact to the UHV and examined with XPS especially by interpreting the x‐ray‐induced Auger signal L 3 MM. The signal was fitted with standard spectra of clean Cu and Cu 2 O…
A brief review of the structural and electronic properties of Fibonacci, Thue-Morse, and random superlattices (SLs) is given. Quasiperiodic Fibonacci SLs and 1-D analogs of quasicrystals; their wave behavior is characterized by critical hierarchy of gaps. The interest in random SLs focuses on the problem of Anderson l…
The synthesis of the µ-carbido species of formula (pcFe)2C (pc = phthalocyaninato dianion) has been accomplished by reaction of pcFe with Cl4, while reaction of (pcFe)2C with 1-methylimidazole produces an adduct of formula [(1-Meim)pcFe]2C; on the basis of i.r. and visible spectra and single crystal X-ray data, both s…
The crystallization process of noncrystalline indomethacin (IMC) obtained by the grinding and by the fusion method was analyzed by a kinetic method. The noncrystalline samples of IMC were the α form ground for 10 h at 4°C (GNCγ), the γ form ground for 10h at 4°C (GNCγ) and the fused solid (NC). Ten kinetic models were…
A finite-element-method (FEM) time-periodic magnetic-field calculation is described. An AC calculation involving saturation characteristics requires many iterations and much storage space. The combination of FEM and the harmonic balance method enables the harmonic magnetic flux distribution under AC magnetization to b…
Sensitivity of API-5L X42 and X70 line-pipe steels to hydrogen degradation of fracture properties has been studied under a variety of loading conditions. Hydrogen-enhanced crack growth under fatigue and static loading was evaluated in numerous hydrogen-rich gas mixtures. Under cyclic loading, hydrogen accelerated fati…
The performance of classical transformer models under nonsinusoidal excitation is investigated and two novel models for such analysis, both of which account for the transformer core magnetic nonlinearities, are presented. All analytical results are compared with experimental data. >
The photoluminescence spectrum of MgO degassed at high temperature has been reinvestigated using a standard JRC-MgO sample because the contribution of low-coordination surface sites (Mg2+LC—O2–LC) to the observed photoluminescence of the degassed MgO samples has been recently questioned. The JRC-MgO-I sample exhibits…
A method for analyzing 3-D magnetic fields and currents in electrical machines excited from voltage sources has been developed. It was obtained by expanding the 2-D finite-element method into three dimensions, using the A phi method. The basic idea and the finite-element formulation are described. The effectiveness of…
Rate constants have been measured for the removal of OH(v= 0), OD(v= 0), OH(v= 1) and OD(v= 1) in collisions with CO. At room temperature (298 ± 4 K) and in 18 or 25 Torr argon, the values obtained were (k/10–13 cm3 molecule–1 s–1)= 1.53 ± 0.15, 0.55 ± 0.1, 10 ± 2 and 9.5 ± 2, respectively. Our results for OH(v= 0) an…
Description Papers cover all aspects of preventing of controlling hydrogen embrittlement, including the making of alloys, part fabrication, finishing, in-service performance testing, and testing actual hardware for quality assurance. This book focuses on the use and interpretation of standardized tests relative to hyd…
A model for small-scale single droplet fuel/coolant interactions (FCIs) is proposed, which considers the growth of a coolant vapor/liquid interfacial disturbance into a coolant liquid jet during the collapse of the vapor film surrounding the fuel. This results in the encapsulation of the jet as coolant drops beneath t…
Stator windings from three generators and one motor were subjected to a wide variety of diagnostic tests. Diagnostic tests included insulation resistance, polarization index, capacitance, dissipation factor tip-up, partial discharge magnitude, and discharge inception voltage. The destructive tests included breaking do…