Materials Literature
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Abstract The polarizability and hyperpolarizabilities of nitrophenols as model compounds for studying nonlinear optics have been investigated at the Hartree‐Fock level of approximation by means of the Dalgarno Uncoupled Hartree‐Fock (DUHF) or Sum Over Orbitals (SOO) method. The additive character and the charge transf…
Undersaturated and supersaturated zincate solutions have been prepared electrochemically and chemically, and studied using nuclear magnetic resonance (NMR) spectrometry and extended x‐ray absorption fine structure (EXAFS). 67 Zn NMR spectroscopy shows only one resonance line, the area of which first increases with the…
Removal of the foliaceous varices from the shells of Chicoreus dilectus had no significant effect on the crushing strength (load at failure) of the shells, but decreased the total work necessary to break the shells by 35–50%. This effect was due to the removal of varices as an architectural feature of the shell rather…
A neuro‐fuzzy control model has been devised for the next generation of so‐called “intelligent sewing machines”. The model incorporates discrimination of material characteristics to be stitched by automatic determination of their properties. The fabric/machine interactions at different speeds have been computed in the…
In this paper, we present a finite element model for the calculation of zero phase sequence reactance for three phase three leg core type power transformers. An axisymmetrical approximation is assumed. A simplified model is used to assess the tank's hottest spot temperature.>
We present an experiment of densification of a 2D horizontal assembly made of regular pentagons. The annealing leads to a dense crystalline arrangement with quasisixfold symmetry in spite of the geometrical characteristics of the grains and of the a priori short-range correlation length in the packing. This configurat…
The structures of tetra-n-butylammonium bromide,N(C4H9)4Br (abbreviated: 4Br) and tetra-n-butylam-monium iodide, N(C4H9)4I (abbreviated:4I) have been determined. For 4Br: Mw = 322.4 Da, c-centered monoclinic space group C2/c, a = 14.409(5) Å, b = 13.901(2)Å, c = 20.345(9)Å, β= 110.18(3)Å, V =3729.4Å3, Z =8, Dc = 1.148…
Indentation crack‐shape evolution during subcritical crack growth was examined in soda‐lime glass. Crack‐arrest markings were generated on the fracture surfaces by temporary unloading during subcritical crack growth. Crack shapes were determined from these crack‐arrest markings by optical microscopy. The shapes were f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFurther Gold Aggregation at a Pentanuclear Gold Cluster with Hypercoordinate Interstitial NitrogenKlaus Angermaier and Hubert SchmidbaurCite this: Inorg. Chem. 1995, 34, 11, 3120–3122Publication Date (Print):May 1, 1995Publication History Published online1 May 2002Published…
The semiempirical atom superposition and electron delocalization molecular orbital (ASED-MO) theory was used to study the H-Fe interaction. Calculations were carried out using clusters of the type Fe 35 simulating both the adsorption and the absorption of an H atom on/in the (100) face and in the (100) dislocation. Th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAddition of Metallic Mercury to Platinum- and Palladium-Gold Cluster Compounds. X-ray Crystal and Molecular Structures of [(Hg)2Pd(AuPPh3)8](NO3)2 and [(Hg)Pt(AuPPh3)8](NO3)2Rachael A. T. Gould, Kathryn L. Craighead, Jack S. Wiley, and Louis H. PignoletCite this: Inorg. Chem…
Visible light emitting diodes are fabricated from p-type porous silicon (PoSi) thin films (∼200 nm) using indium tin oxide (ITO)/PoSi n-p heterojunction structures. Uniform PoSi thin layers were produced by pure chemical etching (stain etching) of B-doped single crystalline Si in a HF:HNO3-based solution. Electrolumin…
The surface morphology of porous silicon, produced by both chemical and electrochemical means, is studied by scanning force microscopy. Observed surface features in the macroscopic range (larger than 30 μm) include etch pits as well as rings and plateaus which are associated with hydrostatic forces during the etching…
The longitudinal and transverse structure functions are calculated for inclusive electron scattering from $^{12}\mathrm{C}$ and $^{40}\mathrm{Ca}$ in the quasielastic and dip region. The microscopic model presented here incorporates two-body currents derived from one-pion exchange and intermediate \ensuremath{\Delta}…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Novel Honeycomb-like Copper(II) Phosphate Framework, [BaCl][CuPO4]Kristen M. S. Etheredge and Shiou-Jyh HwuCite this: Inorg. Chem. 1995, 34, 11, 3123–3125Publication Date (Print):May 1, 1995Publication History Published online1 May 2002Published inissue 1 May 1995https://p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of Urea on Dioctadecyldimethylammonium MonolayersSilvia M. B. Souza, Hernan Chaimovich, and Mario J. PolitiCite this: Langmuir 1995, 11, 5, 1715–1719Publication Date (Print):May 1, 1995Publication History Published online1 May 2002Published inissue 1 May 1995https://…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of Sonochemistry in Monitoring Chlorinated Hydrocarbons in WaterGrazyna E. Orzechowska, Edward J. Poziomek, Vernon F. Hodge, and William H. EngelmannCite this: Environ. Sci. Technol. 1995, 29, 5, 1373–1379Publication Date (Print):May 1, 1995Publication History Published…
Abstract UV irradiation of the Ag+/ZSM-5 catalyst prepared by an ion-exchange method in the presence of NO led to the photocatalytic decomposition of NO into N2, N2O and NO2 at temperatures as low as 298 K. Investigations of in-situ XANES, ESR, and DRS of the Ag+/ZSM-5 catalyst as well as the effective wavelengths of…
Co(II)‐ and Fe(II)‐phthalocyanines adsorbed on platinum and various carbon electrode surfaces have been studied by spectroelectrochemical techniques. The metallophthalocyanine (MPc) films were prepared on substrate electrodes by a drop‐dry method after dissolving them in pyridine. While not much change in the spectros…
An empirical electrical equivalent circuit for dielectric thin films, based on experimental data, is developed. Current responses to voltage-steps and to voltage-ramps are calculated and compared with experimental data. The simulation allows us to separate current contributions of different physical processes while th…