Materials Literature
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Using a model for the electric field built up in insulating materials irradiated by electrons, a Monte Carlo simulation method has been applied to the binary oxides Al2O3, MgO, SiO2, Y2O3 and Nb2O5. The results show the alteration of the shape of the depth distribution of characteristic x-ray production, the Φ(ρz) fun…
PURPOSE: The reproductive toxicology of mangafodipir trisodium (MnDPDP, Teslascan), a new hepatobiliary MR contrast agent, was evaluated in rats and rabbits. MATERIAL AND METHODS: Male and female fertility and post-natal development were examined in rats after repeated i.v. injections of MnDPDP. The developmental toxi…
The objective of this article is to give the nonspecialist some helpful insights into the problems commonly encountered in solution crystallization and to offer a brief update on what is new. The text is in two main parts: an overview of the fundamentals which includes some basic guidelines for process development and…
PURPOSE: To investigate the general toxicology of mangafodipir trisodium (MnDPDP, Teslascan). MATERIAL AND METHODS: Studies were performed in accordance with standard methods and in compliance with regulations current at the time of conduct. RESULTS: Single-dose studies in rodents and dogs showed that MnDPDP was toler…
The refractive index and the nonlinear optical properties of sodium silicate glass can be easily tailored by replacing the sodium with silver. However, the thermal responses of silver and the corresponding modifications of the silica (SiO 2 ) network in ion‐exchanged glass under heating are still not clear. X‐ray phot…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Time-Resolved Electron Paramagnetic Resonance Study of Excited Triplet Porphyrins in Fluid SolutionJun-ichi Fujisawa, Yasunori Ohba, and Seigo YamauchiView Author Information Institute for Chemical Reaction Science Tohoku University Katahira 2-1-1, Aoba-ku, Sendai 98…
A kinetic investigation of the selective catalytic reduction (SCR) of nitric oxide (NO) by propylene (C 3 H 6 ) was conducted over a 0.8 wt % Pt/Al 2 O 3 catalyst in the temperature range of 200−500 °C. The results indicate the presence of two kinetically distinct regions at temperatures above and below the temperatur…
In this paper, a transient response analysis is developed by combining a broadened pulse with a step change or an isotopic pulse. The combined method provides information about the activation of the catalyst and the catalytic reaction mechanism. The method is applied to the CO 2 reforming of methane over NiO/SiO 2 at…
A method for designing antireflection coatings by the use of an absorbing layer and a dielectric layer is proposed. Theoretical and experimental results of three two-layer wideband antireflection coatings with Au, Cu, and TiO(x)N(y) are given. The antireflection coatings have low reflectance, good conductivity, and a…
We measured the O 1s and Ti 2p X-Ray Absorption Spectroscopy (XAS) spectra of a series of ternary Ti oxides. The spectra of A12TiO5 are compared to those of TiO2 and the physical mixture TiO2–Al2O3. The spectra reflect important differences in the electronic structure caused by changes in the chemical bonding. It is a…
We consider a set of ``simple'' polymer chains (linear, flexible, neutral, homogeneous) in the presence of a flat solid-liquid interface, where the surface is attractive and the chains adsorb reversibly. We show that the scaling approach recently proposed by Aubouy, Guiselin, and Rapha\"el (AGR) [Macromolecules 29, 72…
The application of single step or multiple anodic potential steps to highly concentrated solutions of N -vinyl-2-pyrrolidone leads to the formation of poly( N -vinyl-2-pyrrolidone) (or PVP) films on platinum electrodes. These films are insoluble in a good solvent of the commercial polymer. Multiple potential steps yie…
A convenient new synthetic route to metallo-1,2-enedithiolates was applied to the synthesis of (dppe)M{S 2 C 2 (heterocycle)(H)}; dppe = 1,2-bis(diphenyldiphosphino)ethane, M = Ni, Pd, and Pt, and heterocycle = 2-quinoxaline, 2-, 3-, and 4-pyridine, and 2-pyrazine. These complexes were prepared from the corresponding…
The structure of 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) has been reinvestigated by a combination of electron diffraction, high-resolution imaging, simulations of electron diffraction patterns and images, and packing energy calculations. A new model is proposed that is capable of explaining the large second harmon…
Orientational order and mobility of nematogens adsorbed in nanoporous glass are investigated by 1H and 13C NMR and broadband dielectric spectroscopy. For the mesogen 5CB, we detect local nematic order in cavities of 2. 5, 5. 0 and 7. 5 nm diameter. Quantitative measurements of the order parameter are reported. The nem…
The compound Na(5)Sn(13) forms in the sodium-tin system in high yield following prolonged reaction of a quenched mixture at 280 degrees C in a Ta container. The compound exhibits a complex three-dimensional structure (29 independent atoms) built mainly of 4-bonded tin atoms in interbonded pentagons (orthorhombic, spac…
Approaches are described for the analysis of XPS signals from samples comprising thin conformal coatings on substrates with non-ideal surface topography. In particular, attention is focused on arbitrarily shaped rough or curved substrates. Relations are derived for the relative x-ray photoelectron intensities emitted…
Abstract New “unsymmetrical” (mixed ligand) metal dithiolate complexes, expected as components of molecular conductors, have been obtained by a ligand-exchange reaction in refluxing acetone, followed by isolation with a preparative HPLC (ODP; acetonitrile-H2O). Their electrochemical data suggest that the acceptor (don…
Matrix isolation IR spectroscopy and high-level ab initio calculations were applied to investigate the structure and vibrational spectra of quinone−pyrimidine heterodimers formed in low-temperature Ar matrices. A specially developed experimental technique was used to separate bands of quinone−pyrimidine dimer from ban…
The effect of anisotropy in thermal vibrations on dynamical electron diffraction by a crystal is investigated. Expressions are first derived for both the elastic and thermal diffuse scattering (TDS) absorptive atomic scattering amplitudes for the general case of anisotropic thermal vibrations. These expressions are th…