Materials Literature
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. Raman spectra are reported for powdered crystalline anorthite, sanidine, leucite, a-nepheIme, an~ ~-carnegie~te ~nd glasses .ofCaA12Si20s (An), KAlSi30s (Or), and NaAlSiO. (Ne) composItIOns. Quahtatlve compansons between features in the spectra of the isochemical c~stal~ a~d glasses indicate that the glasses maintai…
Etude de l'influence des procedures de reduction de donnees, des modeles de facteur de temperature et des modeles de deformation sur les resultats
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDisubstituted tungstosilicates. 1. Synthesis, stability, and structure of the lacunary precursor polyanion of a tungstosilicate .gamma.-SiW10O368-Jacqueline Canny, Andre Teze, Rene Thouvenot, and Gilbert HerveCite this: Inorg. Chem. 1986, 25, 13, 2114–2119Publication Date (P…
A Landau-Ginzburg approach to an interface with finite thickness incorporates surface tension, anisotropy, curvature, and dynamics of the interface along with supercooling. Various aspects are rigorous.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyhedral oligometallasilsesquioxanes (POMSS) as models for silica-supported transition-metal catalysts. Synthesis and characterization of (C5Me5)Zr[(Si7O12)(c-C6H11)7]Frank J. FeherCite this: J. Am. Chem. Soc. 1986, 108, 13, 3850–3852Publication Date (Print):June 1, 1986Pu…
The crystal structure of synthetic BeO, bromellite, has been determined at several pressures to 5.0 GPa and several temperatures to 1183 K. The single variable atomic-positional parameter, z of oxygen, does not vary significantly with pressure, but does undergo a small increase with temperature. The hexagonal axial ra…
The selected research activities on integrated optics components and devices using periodic structures are reviewed, with emphasis on the authors' works employing the electron-beam writing technique. The periodic structures include static gratings and dynamic ones produced through acoustooptic (AO) and electrooptic (E…
The characteristics of electrochemically produced polyaniline as the active material of secondary batteries were studied in aqueous electrolytes. The cell of the type, , has the maximum capacity of 108 Ah/kg and the energy density of 111 Wh/kg. The coulombic efficiency was close to 100% over at least 2000 complete cyc…
Oligonucleotide-directed mutagenesis was used to investigate the nature of transition state stabilization in the catalytic mechanism of the serine protease, subtilisin BPN'. The gene for this extracellular enzyme from Bacillus amyloliquefaciens has been cloned and expressed in Bacillus subtilis. In the transition stat…
We have studied the behavior of a chemically synthesized polypyrrole as electrode material. The different electrochemical methods that we have used for this characterization, namely, cyclic voltammetry, ac impedance measurements, and cyclic chronopotentiometry, have evidenced the role of the low frequency capacitance…
Nb‐doped BaTiO 3 has been prepared with various Ba/(Ti + Nb) ratios such that single‐phase products will be obtained if the charged donor center is assumed to be compensated in turn by Ba vacancies, Ti vacancies, equal concentrations of the two cation vacancies, oxygen interstitials, or electrons. For air‐Fired sample…
Copper single crystals oriented for multiple slip with [001] axes have been deformed in tension and investigated by X-ray line-broadening measurements using {002} Bragg reflections. The intensity distributions of the broadened line profiles of the deformed crystals exhibit an asymmetry whose ‘sign’ depends on the part…
A model was constructed for electromigration failure where both Fickian diffusion and mass transport due to the electromigration driving force are considered concurrently. The solution to the resulting diffusion equation yields a current exponent of 2 and an activation energy consistent with grain-boundary self-diffus…
REVIEWSpresented in this section begin with two papers which sketch how to calculate the forces in hydrodynamic journal bearings and tilting pad bearings.Six papers then address instabilities due to: internal energy dissipation; asymmetries (such as bearing stiffnesses or inertias) which introduce time dependent param…
This work, which follows on others, study the variation of the pH, and likewise the concentrations of the ions Ca (II) and SO4 (II) of the filtered potable water in which there were submerged the test specimens of mortar (1:3) made with a Portland cement (cement 3 < > P-450) and with the mixtures cement 3/slag = 85/15…
Inductively coupled plasma emission spectroscopy technique (ICP) raised as a step forward in traditional emission spectroscopy, has allowed the quantification, even from a trace, of the elements of a sample by means of the elimination of most of the chemical interferences. In this paper, a view of the subject is given…
The influence of aireation on the appearance or elimination of the false setting in industrial portland cements is studied by means of infrared spectroscopy.
For twenty-five years The ASTM method used to determine reductions in concrete durability after freeze-thaw cycling has been C215-60. In this test the fundamental frequencies of a concrete specimen are compared. This test is time consuming, noisy and often inaccurate. In this paper a new method is proposed for measuri…