Materials Literature
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Cu/ZrO2 catalysts show high activity for the NO–CO reaction, even at low temperature (100–200°C). The structure and reduction behaviour of ZrO2-supported Cu species have been characterized by means of X-ray absorption near-edge structure (XANES), extended X-ray absorption fine structure (EXAFS), FTIR and temperature-p…
The geometry of two-components yarns is investigated, and a new approach is presented which addresses some of the limitations of other models The model takes account of the compressional deformation of the individual strands caused by transverse forces generated during the twisting process. The change in the cross-sec…
Super-resolution readout for read-only optical disks was demonstrated using a photochromic mask layer. Nonlinear transmittance change, which is desirable for effective super-resolution readout, was achieved using a the photochromic mask layer with an optical density of 0.5. The photochromic super-resolution method is…
The sintering behavior of hydrothermally synthesized cubic and tetragonal BaTiO 3 powders was studied as a function of temperature. In addition, the dielectric properties of the sintered samples were examined from room temperature to 200°C at a frequency of 1 kHz. The influence of powder characteristics and sintering…
The synthesis of a novel layered sodium titanosilicate, Na3(Na,H)Ti2O2[Si2O6]2.H2O (AM-4), and the solution of its crystal structure by ab initio methods are reported.
Piezoelectric ceramic/polymer composites, also known as piezocomposites, have been developed over the past two decades for electromechanical transducers to be used in both military and civilian applications. Recently, the thrust in these transducers is toward high operating frequencies, requiring fine-scale (<200-μm c…
The microwave-assisted acid dissolution of sintered bodies of 28 structural and electronic advanced ceramic materials was systematically evaluated. These materials included zirconia-based ceramics, such as m-ZrO2 (a non-stabilized monoclinic zirconia), Ca-PSZ and Mg-PSZ (two partially stabilized zirconias), Y-FSZ (a f…
Molecular modeling techniques using attachment energy calculations have been applied, for the first time to our knowledge, to simulate the morphology of an organic hydrate: alpha-lactose monohydrate. Calculation of the strong intermolecular forces using the atom-atom approximation and the potential parameters of Nemet…
We examined the species composition and concentrat~on of planktonic algae as well as irradiance and near-surface temperature and sal~nity 3 times per week for 1 yr in a turbulent marine environment with con.tinuously high nutrient concentrations Seasonal variations in tempera.ture and sahn~ty were small, and diatoms c…
The pyrolysis of trifluoroacetic acid has been carried out in the temperature range 513–593 K both as the neat gas and also in the presence of nitrogen as diluent. Reactions were carried out in a sealed sodium borosilicate glass cell, and the progress of the reaction was monitored by in situ Fourier transform IR spect…
We comprehend both interconnect electromigration and Joule heating to study for the first time the self-consistent solutions for the maximum allowed interconnect peak current density j/sub peak/ as a function of wave shape. The maximum allowed temperature and j/sub peak/ solutions monotonically increase as the duty cy…
The influence of V2O5 loading (2–50 wt.%) on surface structures and the reduction pattern of V2O5/SiO2 (VPS) catalysts has been systematically investigated by diffuse reflectance UV–VIS spectroscopy and temperature-programmed reduction (TPR) measurements in the temperature range 200–1100°C. Both TPR and UV–VIS spectra…
PURPOSE: To determine the effective time window for MR imaging of tumors with blood-brain barrier (BBB) damage after injection of Gd-containing contrast media. MATERIAL AND METHODS: Eleven patients with 15 brain lesions (metastasis, glioma, abscess) were studied with a T1-weighted spin-echo sequence repeated over peri…
A cathodic photocurrent was obtained from a hemicyanine dye containing zinc complex; [(CH 3 ) 2 NC 6 H 4 CH CHC 5 H 4 NC 18 H 37 ] 2 Zn(dmit) 2 (where dmit = 4,5-dimercapto-1,3-dithiole-2-thione), modified SnO 2 electrode by Langmuir−Blodgett (LB) technology in a 1 M KCl electrolyte solution. The action spectrum confo…
meso-Tetraarylporphyrins are synthesized from pyrrole and aryl aldehydes cleanly and efficiently in one step without solvents or catalysts by reactions at temperatures 10–15 °C above the boiling point of the starting aldehydes using air as oxidant.
We prepared polymers having a phospholipid polar group, poly [omega-methacryloyloxyalkyl phosphorylcholine (MAPC)-co-n-butyl methacrylate(BMA)], as new biomedical materials and evaluated their blood compatibility with attention to protein adsorption and platelet adhesion. The total amount of proteins adsorbed on the p…
We develope a theoretical model of first order resonant Raman scattering in spherical nanocrystals which includes excitonic effects. Using a matrix diagonalization technique, the exciton wavefunctions and energy states as a function of quantun dot radius are calculated. The Fröhlich interaction between excitons and op…
Layered double hydroxides (LDHs) of Mg with trivalent cations such as Al, Cr and Fe show two mass loss steps on heating; the low-temperature (25–250 °C) loss is due to dehydration and the high-temperature (250–450 °C) loss is due to decomposition. Both steps are reversible and the oxide residues obtained after calcina…
Non‐centrosymmetric arrangement of the chromophores is a prerequisite for non‐vanishing macroscopic second‐order nonlinear optical responses. It is shown that an acentric packing of a highly polarizable merocyanine dye, with optimized orientation for frequency conversions, can be induced by hydrogen‐bond‐directed self…
Thin films of polypyrrole (PPY) were deposited in-situ from aqueous polymerizing solutions of pyrrole onto the surface of various substrates. A relationship between the structure of the dopant ion, conductivity, and optical absorption in the near IR was observed. The changes in conductivity and spectra are related to…