Materials Literature
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Fe-ZSM-5 showed the best catalytic performance (nearly 100% N2 yield) and resistance to water vapor for selective catalytic oxidation of NH3 to N2 at a high gas hourly space velocity (2.3 × 105 h−1) among transition-metal (Cr, Mn, Fe, Co, Ni and Cu) ion-exchanged ZSM-5 catalysts.
An enzymatic method to graft hexyloxyphenol onto the biopolymer chitosan was studied. The method employs tyrosinase to convert the phenol into a reactive o-quinone, which undergoes subsequent nonenzymatic reaction with chitosan. Reactions were conducted under heterogeneous conditions using chitosan films and also unde…
Films of charge-ordered ${\mathrm{Nd}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3},$ ${\mathrm{Gd}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3},$ ${\mathrm{Y}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3},$ and ${\mathrm{Nd}}_{0.5}{\mathrm{Sr}}_{0.5}{\mathrm{MnO}}_{3}$ show insulator-metal transitions on the passage of sm…
Molecular Magnetism. Theory of Molecular Magnetism. Characterization of Molecular Magnetism. Mechanism of the Spin Alignment of Molecular Magnetism. Molecular Design and Synthesis for Organic Molecular Magnetism. Molecular Design and Synthesis for Inorganic Molecular Magnetism.
Calculation of the electric field and potential distribution is extensively performed in the design and development of nonceramic insulators for high voltage transmission applications. This paper applies a two-dimensional (2-D) and a three-dimensional (3-D) electric field analysis program to calculate the field distri…
An explanation for the chemical changes which lead to high‐rate dissolution of sulfide inclusions and hence to pit initiation is found in the composition changes induced in the sulfides as the steel cools from the melting temperature of the steel to the solidification temperature of the sulfide. In this temperature re…
L. J. Garay,1,2 J. R. Anglin,1,3 J. I. Cirac,1 and P. Zoller1 1Institut fur Theoretische Physik, Universitat Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria 2Instituto de Matematicas y Fisica Fundamental, CSIC, C Serrano 121, E-28006 Madrid, Spain 3Institute for Theoretical Atomic and Molecular Physics, Harv…
Easily accessible liquid crystals of 1-alkylimidazolium salts having a bilayer structure, are good solvents providing a partially ordered reaction environment.
This perspective on blood- materials interactions is intended to introduce the set of papers stemming from the symposium, "Devices and Diagnostics in Contact with Blood: Issues in Blood Compatibility at the Close of the 20th Century," organized on August 4-6, 1999 at the University of Washington by the University of W…
Little data exist on how twist changes the properties of high-performance continuous fiber yarns. For this reason, a study was conducted to determine the influence of twist on the strength and stiffness of a variety of high-performance continuous polymeric fiber yarns. The materials investigated include Kevlar 29®, Ke…
A novel partial discharge (PD) defect identification method is described. Starting with PD data on different families of specimens, a suitable set of parameters are determined and then used as input variables to a neural network for the purpose of identifying the defects within the insulation. In this procedure the st…
Low molecular weight Poly(ethylene glycol) (PEG) (< 20,000)-drug conjugates, prepared over a 20-year period, have been scrutinized and their properties and efficacy reviewed. No commercial products have thus far been reported for these types of compounds. However, during the past 5 years a renaissance in the field of…
The objective of this paper is to compare the performance of thyristor-controlled reactors (TCR) and shunt-connected PWM voltage source inverters (PWM-VSI) for compensation of flicker caused by arc furnaces. First of all, arc-furnace principles are presented in order to explain the main characteristics of the problem.…
Palladium(II)-supported hydrotalcite acts as a reusable catalyst for the oxidation of alcohols to aldehydes and ketones in the presence of pyridine under atmospheric pressure of oxygen.
Chemical-surface modification of coir fibers was done by dewaxing, using an alkali treatment (5% and 10% NaOH), vinyl grafting with methyl methacrylate (MMA) and cyanoethylation. The chemically modified fibers were characterized by Fourier transform infrared (FTIR) spectroscopy. In addition, the surface features of un…
The crystal structures of two forms of the enzyme dimanganese catalase from Thermus Thermophilus (native and inhibited by chloride) were studied by X-ray diffraction analysis at 1.05 and 0.98 Å resolution, respectively. The atomic models of the molecules were refined to the R factors 9.8 and 10%, respectively. The thr…
Alkanethiolate-protected gold nanoclusters are solublized through place exchange reaction with ω-thiocarboxylic acids.
The anodic behavior of ( S‐phase ) samples in 0.1 M NaOH solution was investigated. Critical potential behavior typical of dealloying was observed while sweeping the potential from open circuit in the anodic direction. Theoretical estimates based on curvature effects in alloy dissolution suggested the development of a…
NMR on ${}^{57}\mathrm{Fe}$ nuclei was measured in two single crystals of magnetite between 4.2 and 135 K (temperature of the Verwey transition ${T}_{V}=121.5$ and 123.9 K). We were able to register all lines detected at 4.2 K also at higher temperatures up to ${T}_{V}.$ The spectra are compatible with the space group…
Mesostructured silica functionalised with the dye moiety, (2,4-dinitrophenylamine), has been prepared with bimodal pore size distribution. Co-condensation of tetraethoxysilane and 3-(2,4-dinitrophenylamino)propyltriethoxysilane was used to covalently couple the organic chromophore into the wall structure of a silica m…