Materials Literature
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Dielectric biaxiality plays an important role in the electric field behaviour of ferroelectric liquid crystal devices, providing the necessary driving force for AC field stabilization and playing an important role in device dynamics. The static electric permittivities have been measured as a function of temperature fo…
<div class="htmlview paragraph">Measurements of oxygen storage capacity (OSC) and HC conversion efficiency for 17 catalysts were carried out in the laboratory. All catalysts with steady state HC efficiency below 90% were found to have roughly equivalent and very low capacities to store oxygen. However, catalyst…
We have investigated the high pressure behavior of InSe by x-ray powder diffraction and optical measurements. The rhombohedral γ-polytype of InSe (space group R3m) exhibits a strongly anisotropic compressibility characteristic of the layer-type structure. Mode Gruneisen parameters of intralayer modes have been determi…
Conventional shear‐lag analyses of matrix cracking and debonding in uniaxial composites loaded in tension predict that the matrix stress varies only very slowly with position except near existing cracks. It therefore follows that the location of subsequent cracks is very sensitive to minor local variations in matrix s…
It is shown that nonlinear segregation effects (saturation, interaction of species) lead to nonlinear grain-boundary penetration plots. If the diffusion penetration depth is larger than a critical value, the concentration profiles become linear. The sign of the curvature and the deviation from a straight concentration…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteraction and catalytic decomposition of 1,1,1-trichloroethane on high surface area alumina: an infrared spectroscopic studyTodd H. Ballinger and John T. Yates Jr.Cite this: J. Phys. Chem. 1992, 96, 3, 1417–1423Publication Date (Print):February 1, 1992Publication History P…
Many unsolved riddles in the glassy and liquid state of matter seem to be connected with the low-frequency excitations in the millielectron volt range. In glasses, an interpretation of neutron scattering and specific heat data in terms of the soft-potential model (an extension of the tunnelling model) indicates a rela…
Aspartate aminotransferase (mitochondrial isoenzyme from chicken) has been found to racemize very slowly dicarboxylic amino acid substrates in the presence of their cognate oxo acids [Kochhar, S. & Christen, P. (1988) Eur. J. Biochem. 175, 433-438]. Tyrosine, phenylalanine and alanine are racemized at the same rate al…
Doping of low molar mass materials or polymers, possessing disc-like units, with electron acceptors leads to the stabilization of columnar discotic phases or even to the induction of such phases in compounds which either display a nematic discotic phase or only an amorphous phase in the absence of the electron accepto…
Abstract Schwerlösliches Bis(phthalocyaninato)cer(IV), [Ce(Pc(2‐)) 2 ] wird durch anodische oder chemische Oxydation mit Dibenzoylperoxid von Bis(phthalocyaninato)cerat(III), gelöst in Dichlormethan, dargestellt. Es kristallisiert in grünen monoklinen Nadeln in der Raumgruppe C2/c mit den Gitterkonstanten a = 18,783(1…
Abstract Ethyl tertiary butyl ether (ETBE) is being proposed as an additive for use in reformulated gasolines. In this study, experiments were performed to examine the kinetics and mechanism of the atmospheric removal of ETBE. The kinetics of the reaction of ETBE with OH radicals were examined by using a relative rate…
In an effort to understand the catalytic mechanism of the tryptophan synthase beta-subunit from Salmonella typhimurium, possible functional active site residues have been identified (on the basis of the 3-D crystal structure of the bienzyme complex) and targeted for analysis utilizing site-directed mutagenesis. The ch…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of chiral 18-membered-macrocycle-lanthanide complexes: circular dichroism and circularly polarized luminescenceTaro Tsubomura, Koichi Yasaku, Takayuki Sato, and Makoto MoritaCite this: Inorg. Chem. 1992, 31, 3, 447–450Publication Date (Print):F…
Pseudomonas resinovorans produced poly-beta-hydroxyalkanoates (PHAs) when grown on hydrocarbons but not on glucose. In a chemostat culture, the PHA composition was beta-hydroxybutyrate (C4)-beta-hydroxyhexanoate (C6)-beta-hydroxyoctanoate (C8)-beta-hydroxydecanoate (C10) (1:15:75:9) on octanoate and C4-C6-C8-C10 (8:62…
Abstract In this study, we report the melting behavior of poly(phenylene sulfide), PPS, which has been cold‐crystallized from the rubbery amorphous state. We find that the crystallization kinetics are faster for cold‐crystallized PPS than for melt‐crystallized material, due to formation during quenching of a short‐ran…
Previous 13CH4/12C2H2 isotopic competition experiments on the mechanism of diamond growth by chemical vapor deposition are reanalyzed in light of recent evidence for a nonlinear dependence of the first-order Raman shift frequency on 13C mole fraction. The new Raman data imply a 13C mole fraction for mixed-isotope diam…
The phase states of a harmonic oscillator are considered and used to define an analytic representation in the unit disk. The Weyl semigroup in the number-angle phase space is studied. More general states called negative binomial states are introduced, and the corresponding analytic representations in the unit disk are…
We report measurements of the de Haas--van Alphen (dHvA) effect in the organic superconductors \ensuremath{\alpha}-(ET${)}_{2}$(${\mathrm{NH}}_{4}$)Hg(SCN${)}_{4}$ and \ensuremath{\kappa}-(ET${)}_{2}$Cu(NCS${)}_{2}$ in fields up to 15 T and temperatures down to 0.45 K. In both compounds, the perfect 1/cos\ensuremath{\…
The lacS gene from the extremely thermoacidophilic archaebacterium Sulfolobus solfataricus encodes an enzyme with beta-galactosidase activity that, like other enzymes from this organism, is exceptionally thermophilic (optimal activity above 90 degrees C), thermostable, and resistant to common protein denaturants and p…
This paper reports the preliminary results of a study of the anelasticity of a Cu-1.8% Be alloy at strain frequencies between 10−2 and 10−3 Hz. The measurements were made using a vertical dumb-bell pendulum suspended near its centre of mass by a flexure pivot made from the Cu-Be alloy under test. Unexpectedly large an…