Extended X-Ray Absorption Fine-Structure Study of Cobalt-Exchanged Sepiolite: Reply
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Semiconductor alloys for fast thermal sensors
The electron mobility in the semiconductor alloys near compositions where the direct-to-indirect gap transition takes place can be a rapidly varying function of lattice temperature. Electron mobility limited by scattering mechanisms such as acoustic phonons, optical phonons, and alloy disorder is calculated for severa…
Corrosion behaviour of the aluminium alloy AA 6351 in glycol/water solutions degraded at elevated temperature
Abstract A research programme has been developed to characterize the corrosion behaviour of the metals most widely used in solar collector systems. Common heat transfer fluids such as glycol/water solutions show a low aggressivity, unless pollution or high temperature exposure (degradation) occur. This paper deals wit…
Metal-Metal Bonds in Metalloporphyrins
The chemistry of metal-metal bonded metalloporphyrins has undergone significant development during the last decade. The synthesis, chemical reactivity, physical properties and electrochemistry of metal-metal bonded metalloporphyrins containing both σ and donor-acceptor bonds are presented. These new classes of metallo…
Dielectric slab in a parallel-plate condenser
The problem of a dielectric slab inside a parallel-plate capacitor is considered from the point of view of a simple force calculation. The usual method of presenting this problem, found in most textbooks, is via energy considerations. The method presented here allows corrections to the well-known result to be obtained.
Rapid Solidification of (2-Hydroxyethyl)trimethylammonium Silicate
Abstract A large amount of solids of (2-hydroxyethyl)trimethylammonium silicate, whose silicate skeleton has the double four-membered ring structure, was abruptly separated out from the mixed solution of (2-hydroxyethyl)trimethylammonium hydroxide aqueous solution and tetraethoxysilane after a few hours of stirring.
Hard magnetic properties of Nd-Co-B materials
A systematic investigation of the magnetic properties of neodymium-cobalt-boron alloys rapidly solidified by melt spinning is reported. Room-temperature coercivities and energy products as large as 10.2 kOe and 5.2 MGOe, respectively, have been observed in ribbons comprised primarily of tetragonal Nd2Co14B. We find th…
Synthesis and Physical Properties of 3,6‐Di‐tert‐butyl‐1,4‐diazapentalene
The pentalene derivative 2 is only inductively stabilized. It was obtained by reaction of the dihydro derivative 1 with nickel peroxide. Comparison of the spectroscopic data with the results of MNDO calculations indicates that the Kekulé structure shown here dominates; that is, the bonds are fixed.
Fabrication of Silicon Microstructures Based on Selective Formation and Etching of Porous Silicon
Abstract not Available.
Statistics of free-radical polymerizations revisited using a fragment approach. 1. Bifunctional monomers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStatistics of free-radical polymerizations revisited using a fragment approach. 1. Bifunctional monomersRoberto J. J. WilliamsCite this: Macromolecules 1988, 21, 8, 2568–2571Publication Date (Print):August 1, 1988Publication History Published online1 May 2002Published inissu…
Melt rheological properties of nickel powder filled polypropylene composites
Abstract The melt rheological properties of nickel powder filled polypropylene composites were investigated. The effect of filler concentration on shear stress‐shear rate data, melt viscosity and melt elasticity parameters were determined by using a capillary rheometer. The study shows that the materials follow a powe…
Inorganic Aspects of the Blood Chemistry of Ascidians. Ionic Composition, and Ti, V, and Fe in the Blood Plasma ofPyura chilensisandAscidia dispar
Iron, titanium, and vanadium analysis were performed on the tunicates Pyura chilensis Molina, 1782, and Ascidia dispar, and the inorganic chemistry of blood was investigated. The major ionic characterization of the blood plasma and cytosolic solutions were determined. Gel chromatography was used to secure information…
Absorption, fluorescence, and electron spin resonance investigation of tervalent cerium activated LaMgAl11O19
Single crystals of the magnetoplumbite (MP)-like compounds La1−xCex MgAl11O19 (0≤x≤1) have been grown from the melt by the flame fusion method. These crystals have been characterized by optical absorption and fluorescence which occur between 4f and 5d levels as well as by electron spin resonance at 20 K. For dilute sa…
Formation of singlet molecular oxygen (1.DELTA.gO2) in a solution-phase photosensitized reaction. 2. A comment on static quenching
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of singlet molecular oxygen (1.DELTA.gO2) in a solution-phase photosensitized reaction. 2. A comment on static quenchingKai Kong Iu and Peter R. OgilbyCite this: J. Phys. Chem. 1988, 92, 16, 4662–4666Publication Date (Print):August 1, 1988Publication History Publis…
Relationship between Plasma Parameters and Carbon Atom Coordination in a-C:H Films Prepared by RF Glow Discharge Decomposition
Amorphous C:H films were prepared by rf glow discharge decomposition from CH 4 using a permanent magnet system to apply a static magnetic field perpendicular to the rf electric field. The structure and properties of a-C:H films have been investigated systematically with respect to the hydrogen content, hardness and co…
Sensitization and photoredox reactions of zinc(II) and antimony(V) uroporphyrins in aqueous media
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSensitization and photoredox reactions of zinc(II) and antimony(V) uroporphyrins in aqueous mediaK. Kalyanasundaram, J. A. Shelnutt, and Michel GraetzelCite this: Inorg. Chem. 1988, 27, 16, 2820–2825Publication Date (Print):August 1, 1988Publication History Published online1…
Dynamical scaling, domain-growth kinetics, and domain-wall shapes of quenched two-dimensional anisotropicXYmodels
The domain-growth kinetics in two different anisotropic two-dimensional XY-spin models is studied by computer simulation. The models have uniaxial and cubic anisotropy which leads to ground-state orderings which are twofold and fourfold degenerate, respectively. The models are quenched from infinite to zero temperatur…
Stereochemical configuration of polyfumarates as studied by 13C nuclear magnetic resonance spectroscopy
Abstract The 125 MHz 13 C NMR spectra of some poly(dialkyl fumarates) (PDAF) and poly(dicycloalkyl fumarates) (PDCF) prepared by radical polymerization are measured in CDCl 3 solution at 60°C. The multiplet resonances of the main‐chain carbon atoms and the ester carbonyl carbon atoms are assigned to stereochemical tri…
Fourier transform far-infrared spectroscopic study of cation and anion dynamics in M,X sodalites, where M = lithium(1+), sodium(1+), potassium(1+), rubidium(1+), cadmium(2+); X = chloride, bromide, iodide, perchlorate, hydroxide
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFourier transform far-infrared spectroscopic study of cation and anion dynamics in M,X sodalites, where M = lithium(1+), sodium(1+), potassium(1+), rubidium(1+), cadmium(2+); X = chloride, bromide, iodide, perchlorate, hydroxideJohn Godber and Geoffrey A. OzinCite this: J. P…
Upper critical fields of periodic and quasiperiodic Nb-Ta superlattices
Upper critical fields have been studied for two series of Nb-Ta superlattices grown by molecular-beam epitaxy with both periodic and quasiperiodic (Fibonacci sequence) layering. X-ray results are presented to characterize the nature and quality of the layering. Positive curvature in the perpendicular upper critical fi…