Materials Literature
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The lowest excited electronic state of small CdSe crystallites is calculated within a tight-binding approximation. Two types of crystal shape and a spatially varying dielectric constant are considered. The results are found to compare favorably to recent experiments.
Molecular dynamics computer simulations are reported here for the structures and energies of monolayer and bilayer films of ammonia adsorbed on the basal plane of graphite. A pair-wise additive intermolecular potential function is used that includes electrostatic interactions by distributions of discrete charges withi…
We report the far-infrared through visible photoinduced absorption (PA) spectra of polyaniline in the emeraldine-base and leucoemeraldine-base forms. The direct-absorption spectrum of emeraldine base (EB) has a broad absorption centered at 2 eV (the ``exciton'' band) and an absorption band at \ensuremath{\sim}3.6 eV (…
A detailed vibrational analysis of the infrared and Raman spectra of doped and pristine polypyrrole is presented. The theory of the effective conjugation coordinate is applied and fully justifies the observed spectra. The information on the structure and properties of this material derived from the proposed analysis a…
The interpretation of the infrared and Raman spectra of pristine polypyrrole as 1-d lattice is presented as the result of lattice dynamical calculations. Geometries and vibrational force fields are derived from semiempirical quantum chemical calculations and/or from the optical spectra of oligomers. This paper lays th…
Vacuum-ultraviolet reflectance and photoemission spectra of ${\mathrm{VO}}_{2}$, ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$, ${\mathrm{V}}_{6}$${\mathrm{O}}_{13}$, and ${\mathrm{V}}_{2}$${\mathrm{O}}_{5}$ are measured in order to investigate the 3d-band structures and electron-correlation effects. In the case of ${\mathrm{V…
Substituent, Heteroatom, and Solvent Effects on the Thermal‐Bleaching Kinetics and Absorption Spectra of Photomerocyanines Issued from Spiro[indoline‐oxazines] Quantitative information useful for the development of new photochromic systems is obtained from the study of heteroatom and substituent effects on the thermal…
Recently the authors developed an atmospheric-pressure glow discharge plasma method which can be applied to surface treatment and deposition on insulating surfaces for purposes of large-scale system treatment. However, this method was not able to treat metallic substrates. Consequently, they have improved the upper el…
The structure of stoichiometric (s) silver beta alumina, Ag 1-x Al 11 O 17+x 2/; x=0.0, prepared via hydrogen reduction of a non-stoichiometric (NS) material with x=0.45 has been determined at 25 degrees C, 300 degrees C and 500 degrees C by Rietveld analyses of powder neutron diffraction data. In contrast to the sing…
Abstract The diatom data used for reconstructing pH within the Surface Water Acidification Project (SWAP) came from several different laboratories. The laboratories used agreed nomenclature and standardized identifications by using quality control techniques. A diatom database (disco) stored and processed counts and s…
Epitaxial layers of GaAs have been grown by metalorganic molecular beam epitaxy (MOMBE) with atomic carbon concentrations ranging from 4×1017 to 3.5×1020 cm−3. The dependences of GaAs lattice parameter and hole concentration on atomic carbon concentration have been determined from x-ray diffraction, Hall effect, and s…
The author shows that the energy functional defined by Harris has a local maximum at the exact ground-state density of an electronic system provided the dielectric screening matrix of the system has eigenvalues that are all greater than unity.
Reference EPFL-ARTICLE-169118View record in Web of Science Record created on 2011-09-29, modified on 2017-11-27
Association structure of benthic diatoms in a hypersaline
UDPgalactose 4-epimerase from Escherichia coli is rapidly inactivated by the compounds uridine 5'-diphosphate chloroacetol (UDC) and uridine 5'-diphosphate bromoacetol (UDB). Both UDC and UDB inactivate the enzyme in neutral solution concomitant with the appearance of chromophores absorbing maximally at 325 and 328 nm…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProposed mechanism for the condensation reaction of citrate synthase: 1.9-.ANG. structure of the ternary complex with oxaloacetate and carboxymethyl coenzyme AMihail Karpusas, Bruce Branchaud, and S. James RemingtonCite this: Biochemistry 1990, 29, 9, 2213–2219Publication Da…
The crystal structure of the ternary complex citrate synthase-oxaloacetate-carboxymethyl coenzyme A has been solved to a resolution of 1.9 A and refined to a conventional crystallographic R factor of 0.185. The structure resembles a proposed transition state of the condensation reaction and suggests that the condensat…
Abstract Thermal degradation of cotton, mercerized cotton, cotton grafted with vinyl acetate‐methyl acrylate mixtures at different compositions, and mercerized cotton grafted with vinyl acetate–methyl acrylate mixture at a composition of 60 : 40 has been investigated using the techniques of thermogravimetric analysis…
We have measured the time dependence of interface formation between two polymers, below their critical temperature for phase separation, using the $^{2}\mathrm{H}$${(}^{3}$He${,}^{4}$He${)}^{1}$H nuclear reaction as a direct profiling technique. We find that the width of the interface initially increases with time as…
Recent attempts at a microscopic description of the liquid-solid transition, within the density-functional theory of non-uniform fluids, are put into a critical perspective by comparing the different methods proposed and the results obtained for the freezing of hardcore systems.