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For pt.VI see ibid., vol.7, no.3, p.9 (1991) Online partial-discharge (PD) tests for monitoring the condition of the solid dielectric insulation in high-voltage equipment are discussed. Sources of external electrical noise are identified, as are attributes of PD and noise that are helpful in drawing distinctions betwe…
In this paper the size effect of lattice-dislocation stability in nanocrystals (NC's) caused by a strong interaction of dislocations with interfaces is analyzed. When the nanocrystallite size l becomes less than the characteristic length \ensuremath{\Lambda}, a substantial dislocation redistribution in the nanocrystal…
The dielectric properties of grain-oriented thin-film vanadium dioxide (VO2) on single-crystal sapphire have been measured as a function of temperature across the phase transformation at 68 °C. The properties of the low- and high-temperature phases were determined by measuring the millimeter-wave transmittance and pha…
We compute all the three-dimensional quasicrystallographic space groups with $n$-fold axial point groups and standard lattices by a method that treats crystals and quasicrystals on an equal footing. We do not rely on projecting higher-dimensional crystallographic space groups, our results are valid for arbitrary $n$,…
The generic redox reaction of a class of linear sulfur‐containing redox polymerization electrodes can be described as ‒ SRS ‒ n + n 2 e − ⇄ n − SRS − that is, the polymer electrode can be progressively depolymerized, leading ultimately to monomeric anions, as the sulfur‐sulfur bridges between the organic R groups are…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron donor-electron acceptor interactions in bimetallic surfaces: theory and XPS studiesJose A. Rodriguez, Robert A. Campbell, and D. Wayne GoodmanCite this: J. Phys. Chem. 1991, 95, 15, 5716–5719Publication Date (Print):July 1, 1991Publication History Published online1…
Methanogens can use H(2) produced by cathodic depolarization-mediated oxidation of elemental iron to produce methane. Thermodynamic consideration of the cathodic depolarization mechanism predicts more oxidation of Fe at lower pH. Methanogenic responses to pH by Methanococcus deltae, Methanococcus thermolithotrophicus,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of poly(1-adamantyl methacrylate): effects of the adamantyl group on radical polymerization kinetics and thermal properties of the polymerAkikazu Matsumoto, Satoshi Tanaka, and Takayuki OtsuCite this: Macromolecules 1991, 24, 14, 4017–4024Publi…
Abstract In many important applications, an elastomer is subjected to repeated deformations of sufficient magnitude and frequency to lead to generation of considerable heat and (depending on the rate of heat removal) of a significant rise in temperature. The purpose of this review is to examine the mechanisms of heat…
We have used Brillouin scattering to measure the temperature dependence of the sound velocities of the longitudinal and transverse vibrational modes in various directions in small single crystals of monoclinic ZrO 2 . Using these velocities and the Christoffel equation, we have calculated the 13 elastic stiffness modu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleChain-length dependence of the glass transition temperatureK. O'Driscoll and R. Amin SanayeiCite this: Macromolecules 1991, 24, 15, 4479–4480Publication Date (Print):July 1, 1991Publication History Published online1 May 2002Published inissue 1 July 1991https://pubs.acs.org/doi/1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRadical scavenging in the sonolysis of aqueous solutions of iodide, bromide, and azideMaritza Gutierrez, Arnim Henglein, and Fernando IbanezCite this: J. Phys. Chem. 1991, 95, 15, 6044–6047Publication Date (Print):July 1, 1991Publication History Published online1 May 2002Pub…
The alpha -peak master functions as obtained within the mode coupling theory for the supercooled liquid dynamics near the glass transition singularity are discussed. Double peak phenomena are found as a generic feature of the theory related to the self crossing of the transition hypersurface. They lead to two scenario…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic states of porphycenesJacek Waluk, Monika Muller, Petra Swiderek, Matthias Kocher, Emanuel Vogel, Georg Hohlneicher, and Josef MichlCite this: J. Am. Chem. Soc. 1991, 113, 15, 5511–5527Publication Date (Print):July 1, 1991Publication History Published online1 May 2…
The first full partial-structure-factor analysis of molten ${\mathrm{GeSe}}_{2}$ is made using the method of isotopic substitution in neutron diffraction. It is shown that the melt comprises roughly equal numbers of edge- and corner-sharing tetrahedra which give rise to a highly connected or network liquid. Concentrat…
Review: Non‐conventional phosphor host materials such as cryptands (see Figure) or zeolites now offer potential alternatives to the traditional inorganic solid‐state materials which find applications in e.g. fluorescent lamps, T.V. sets, or X‐ray detectors. Recent efforts to further optimize conventional materials are…
Structural slowing down in a simple model of a polydisperse suspension of charge-stabilized colloidal particles is explored by molecular-dynamics and Brownian-dynamics simulations. The former ignore solvent effects, but allow a comparison with recent experimental, numerical, and theoretical work on ``fragile'' glass f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAging processes of alumina sol-gels: characterization of new aluminum polyoxycations by aluminum-27 NMR spectroscopyG. Fu, L. F. Nazar, and A. D. BainCite this: Chem. Mater. 1991, 3, 4, 602–610Publication Date (Print):July 1, 1991Publication History Published online1 May 200…
Vibrational spectra have been measured by neutron scattering for a series of Se-Ge and Se-As-Ge glasses, spanning a wide range in composition and, consequently, in network connectivity. Low-frequency ``floppy'' modes arising from underconstrained atomic configurations have been observed, in qualitative agreement with…
coatings were deposited on graphite and titanium from an aqueous solution based on a water‐soluble precursor. A two‐step mechanism is suggested for the formation: generation of hydroxyl ions (OH − ) at the cathodic substrate by reduction of and dissolved , and then reaction of the hydroxyl ions with zirconyl ions pres…