Materials Literature
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A series of sodium aluminosilicate glasses composed of varying ratios ( R ) of Al 2 O 3 /Na 2 O (0.25 R 2.0) has been simulated with the molecular dynamics technique using a tetrahedral form of a three‐body interaction potential. Extrema in the activation energies for sodium diffusion and in the diffusion constants fo…
Polarization characteristics were studied in nickel and yttria stabilized zirconia cermet (Ni‐YSZ cermet) electrodes in order to search for an adequate fabrication condition of a planar solid oxide fuel cell. Several electrodes were prepared by the slurry coating method, and dc and ac polarization behaviors were inves…
Water-Formed and Steam-Formed Deposits. Long-Term Overheating. Short-Term Overheating. Caustic Corrosion. Chelate Corrosion. Low pH Corrosion During Service. Low pH Corrosion During Acid Cleaning. Oxygen Corrosion. Fire-Side Corrosion. Oil Ash Corrosion. Coal Ash Corrosion. Waterfall Corrosion. Cold End Corrosion. Dew…
Electrochemical characterization has been carried out for two types of phenolic resin‐based activated carbon‐fiber cloths (ACFC)—ACFC(a) and (b)—as polarizable electrodes. The specific surface areas of ACFC(a) and ACFC(b) were 1630 and 1060 m 2 g −1 , respectively. The differential capacitance of ACFC(a) in organic el…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControl of surface functionality in the synthesis of dendritic macromolecules using the convergent-growth approachCraig J. Hawker and J. M. J. FrechetCite this: Macromolecules 1990, 23, 21, 4726–4729Publication Date (Print):October 1, 1990Publication History Published online…
The anti-HIV-1 activity and toxicity of representative structural families of polyoxotungstates in human lymphocytes was determined. The 21 compounds examined include those derived from the following structural families: [NaSb9W21O86]18- (HPA-23), Xn+W12O40(8-n)- (Keggin), P2W18O62(6-) (Wells-Dawson), W6O19(2-) (Lindq…
We report the first results of Monte Carlo simulations using hard ellipsoids with three distinct semi-axes a, b, c chosen such that abc = 1, c/a = 10 and b/a varies between 1 and 10. A survey of the phase diagram provides evidence for the existence of isotropic, nematic, discotic, and biaxial liquid crystal phases; th…
Abstract Racemic lactide was polymerized with various initiators containing Zn and Al, and the structures of the obtained polymers were determined by means of 13 C NMR spectroscopy. The extent of transesterification reactions was calculated on the basis of the analysis of the methine carbon signal in the polymer 13 C…
Optical absorption and emission spectra of ${\mathrm{Eu}}^{3+}$ in Ba(${\mathrm{PO}}_{3}$${)}_{2}$, Zn(${\mathrm{PO}}_{3}$${)}_{2}$, and Pb(${\mathrm{PO}}_{3}$${)}_{2}$ glasses are reported. Judd-Ofelt intensity parameters for f-f transitions were derived from the integrated absorption spectra and used to calculate th…
We report the results of a molecular dynamics computer simulation of particles interacting via the Gay-Berne potential with parameters selected to approximate those of mesogenic molecules. The system was found to form a variety of mesophases as the temperature was lowered. We have characterized these phases with the a…
It was found that a local charge-transfer excitation on the donor(D)-acceptor(A) pair leads to a semimacroscopic valence change from the quasi-ionic (${\mathit{D}}^{+}$${\mathit{A}}^{\mathrm{\ensuremath{-}}}$) to quasineutral (${\mathit{D}}^{0}$${\mathit{A}}^{0}$) states in organic molecular-compound TTF-chloranil wit…
Calculations of Mott elastic scattering cross section of electrons for most elements of the periodic table up to element number 94 in the energy range 20 eV–20 keV have been performed. The Dirac equation transformed to a first-order differential equation was solved numerically. The influence of the choice of atomic po…
The high spatial resolution imaging of magnetic microstructure has important ramifications for both fundamental studies of magnetism and the technology surrounding the magnetic recording industry. One technique for imaging surface magnetic microstructure on the 10-nm-length scale is scanning electron microscopy with p…
A method for mounting single crystals in macromolecular crystallographic studies is described in which the crystal is suspended in a thin film. The film is formed from a mixture of the crystallization buffer and a hydrophilic viscous material, confined within a thin-wire loop by surface tension. Compared with conventi…
A listing of the Euclidean normalizers for triclinic and monoclinic space groups having translation lattices with specialized metric is given. These normalizers have not been included in previous tabulations. For convenience, in the case of monoclinic space groups, only the second setting (c-axis unique) is considered…
First experiences in using the new computer-graphics program PEANUT for visualization and real-time manipulation of atomic anisotropic displacement parameters (ADP's) are illustrated by several examples. Kinematic and mixed kinematic-dynamic models of molecular motion in crystals are derived from observed ADP's in an…
First-principles calculations of the shear modulus tensor are presented for the bcc crystalline and rapidly quenched Coulomb solids produced by the Monte Carlo simulation method. The shear moduli are calculated for temperatures up to the melting conditions, including the effects of thermal fluctuations. An effective s…
New highly sensitive thermoluminescence detectors of universal application on the basis of anion-defect a-Al2O3:C single crystals have been developed. The decisive role of non-stoichiometry in forming luminescence properties of crystals has been ascertained by methods of optical, luminescent and exoemission spectrosco…
Copper nitride thin films were prepared by using the ion-assisted deposition in which accelerated nitrogen ions were irradiated during the deposition of copper metal. The degree of nitrification of the film was controlled by changing the ion current density. The reflection coefficient of the prepared copper nitride fi…
Gd(hfac),NITiPr (hfac = hexafluoroacetylacetonate;N ITiPr = 2-isopropyl-4,4,5,5-tetramethyl-4,5-dihy1rH o--i midazolyl-l- oxy1 3-oxide) crystallizes in the monoclinic space group P 2 , / n with cell parameters a = 11.916 (1) A, b = 17.625 ( 9 ) A, c = 18.055 ( I ) A, j3 = 96.98 (I)’, V = 3763.82 A’, and Z = 4. The str…