Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and characterization of an A1u (Oxo) iron(IV) porphyrin .pi.-cation-radical complexHiroshi Fujii and Kazuhiko IchikawaCite this: Inorg. Chem. 1992, 31, 6, 1110–1112Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published iniss…
Abstract Thermal characterization was carried out on highly stereoregular and regioregular syndiotactic polypropene (sPP) obtained with isopropylidene(cyclopentadienyl)(9‐fluorenyl)zirconium dichloride and methylaluminoxane. The influence of molecular weight and syndiotacticity degree on the thermodynamic melting poin…
The mechanism by which cAMP-dependent protein kinase-catalyzed phosphorylation modulates the activities of 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase was examined after site-specific mutation of the cAMP-dependent phosphorylation site (Ser32) to aspartic acid or alanine. The mutant and wild-type enzymes were…
Abstract Conventional batch adsorption‐isotherm experiments are conducted under conditions that are generally not representative of field conditions. Our objective was to develop and illustrate a technique that uses continuous, unsaturated flow through intact soil cores and gives information analogous to standard batc…
Abstract Both Lewis and Brönsted acid sites were found on the surface of TiO2–SiO2 mixed oxide, thouth no Brönsted acid sites were detected on the surface of pure TiO2 and SiO2. While on the surface of TiO2–Al2O3 mixed oxide, no Brönsted acid sites were generated. The rate of isomerization of 1-butene was found to be…
The results of Anthony et al. [Phys. Rev. B 42, 1104 (1990)] on the thermal conductivity at 25 \ifmmode^\circ\else\textdegree\fi{}C of diamonds grown with a reduced $^{13}\mathrm{C}$ concentration are analyzed. The effect of reducing the $^{13}\mathrm{C}$ concentration is about ten times greater than these authors exp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface chemistry of colloidal silver: reduction of adsorbed cadmium(2+) ions and accompanying optical effectsArnim Henglein, Paul Mulvaney, Thomas Linnert, and Arnold HolzwarthCite this: J. Phys. Chem. 1992, 96, 6, 2411–2414Publication Date (Print):March 1, 1992Publication…
We have prepared Si1−yCy alloy layers on Si (001) substrates using solid-source molecular-beam epitaxy. The lattice mismatch between diamond and Si is about 50%. Thus, a Si1−yCy (y=0.02) alloy has a mismatch of about 1% with respect to Si assuming Vegard’s law. Transmission electron microscopy (TEM) shows the layers t…
We have studied the structural properties and electronic structure of a hypothetical, all-${\mathit{sp}}^{2}$ phase of carbon using the first-principles pseudopotential total-energy method. The phase, called bct-4 C, is found to be a low-compressibility metal. Because of the nearly perfect lattice match with the diamo…
Using a split-valence Gaussian 4-31G basis function augmented with diffuse p and d function and multiconfiguration self-consistent-field optimized geometries, the frequency-dependent polarizability \ensuremath{\alpha} and second hyperpolarizability \ensuremath{\gamma} of ethylene, trans-butadiene, trans-hexatriene, an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of defects on the luminescence quantum yield of yttrium europium oxide (Y1.94Eu0.06O3)W. Van Schaik and G. BlasseCite this: Chem. Mater. 1992, 4, 2, 410–415Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published inissue 1 March…
In this paper certain fundamental concepts underlying the phenomenological theories of elastic-plastic deformations at finite strains and rotations are presented, and some of the commonly discussed theories are summarized, emphasizing the constitutive parameters which influence strain localization and material instabi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the observation of a new morphology in poly(arylene ether ether ketone). A further examination of the double endothermic behavior of poly(arylene ether ether ketone)Herve Marand and Abaneshwar PrasadCite this: Macromolecules 1992, 25, 6, 1731–1736Publication Date (Print):…
Trivalent erbium ions in ${\mathrm{CsCdBr}}_{3}$ exist predominantly as dimers along one-dimensional lattice chains. Very efficient upconversion from near-infrared to various visible wavelengths was observed. $^{2}$${\mathit{H}}_{9/2}$${\ensuremath{\rightarrow}}^{4}$${\mathit{I}}_{15/2}$ (414 nm) and $^{4}$${\mathit{F…
We consider a strongly anisotropic three-dimensional conductor in a magnetic field perpendicular to the most conducting direction. We show that the magnetoresistance exhibits a series of resonance like dips when the magnetic field takes particular angles in the b-c plane where periodic motion in the b and the c direct…
Abstract The deposition of yttria‐doped zirconia has been experimented systematically in various types of porous ceramic substrates by a modified chemical vapor deposition (CVD) process operating in an opposing reactant geometry using water vapor and corresponding metal chloride vapors as reactants. The effects of sub…
Abstract The attenuation parameter (AP), which quantitatively describes the influence of elastic electron scattering on the electron spectroscopies, has been calculated for 45 elements (Be, C, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Sr, Y, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Cd, In, Sn, Sb, Te,…
Using molecular-dynamics computer simulation, we study the dynamical behavior of the isotropic and nematic phases of highly anisotropic molecular fluids. The interactions are modeled by means of the Gay-Berne potential with anisotropy parameters \ensuremath{\kappa}=3 and \ensuremath{\kappa}'=5. The linear-velocity aut…
Formation of giant‐grain copper thin films on SiO 2 by a low‐kinetic energy particle process followed by thermal annealing has been investigated. When Cu films are grown on SiO 2 by the process under a sufficient amount of energy deposition, they exhibit almost perfect crystal orientation conversion from Cu(111) to Cu…
Nuclear magnetic resonance (NMR) relaxation of quadrupolar nuclei is introduced as a new method for determining micelle size and nematic order in lyotropic nematic mesophases from the dependence of the spin relaxation rates on molecular diffusion over the curved micelle surface. The approach is illustrated by an exper…