Materials Literature
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A method is presented in which both optical constants and growth rates may be simultaneously extracted from the in situ normal incidence reflectance of a growing thin film. The method employs a virtual interface model, thus avoiding cumulative errors that are encountered if a standard multiple-layer model is used. No…
Abstract We describe a model for framework silicates in which the SiO 4 (and AlO 4 ) tetrahedra are treated as perfectly rigid and freely jointed. From this model we are able to identify low-energy modes of distortion of the structure, which we call Rigid unit modes. These modes can act as soft modes to allow easy dis…
Photoluminescence (PL) and Raman spectroscopy were employed to investigate the nature and sources of stress and the type and distribution of impurities and defects in thin diamond films grown on silicon substrates. The types of impurities and defects which were detected in the diamond films are the nitrogen, silicon,…
ABSTRACT Eight diatom species (Chaetoceros pseudocurvisetus Mang ., Stephanodiscus hantzschii Grun ., Skeletonema costatum ( Grev.) Cleve , Asterionella formosa Hass ., Thalassiosira nordenskioeldii Cleve , Detonula confervacea ( Cleve) Gran , Chaetoceros sp., and Nitzschia frigida Grun.) were isolated from various te…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDouble-Layer Superlattice Structure Built Up of Cd32S14(SCH2CH(OH)CH3)36.cntdot.4H2O ClustersT. Vossmeyer, G. Reck, B. Schulz, L. Katsikas, and H. WellerCite this: J. Am. Chem. Soc. 1995, 117, 51, 12881–12882Publication Date (Print):December 1, 1995Publication History Publis…
The hydroxyl substituent makes it happen! Unlike the nonaromatic benziporphyrin 1a (X = H), the hydroxy compound 1b (X = OH) favors the fully aromatic semiquinone tautomer 2.
Monomers with reactive double bonds were mixed with liquid crystals and polymerized under UV irradiation. The polymer networks formed are anisotropic and consist of fibrils. The orientation of the polymer networks depend on the orientation of the liquid crystals during polymerization. Optical and scanning electron mic…
Onset of pitting corrosion on 304 stainless steel in was investigated at the site of approximately 200 inclusions. A photolithography technique was used to locate individual sites repeatedly in order to characterize them by a combination of scanning electron microscopy, energy dispersive x‐ray, and Auger electron spec…
A normal mode analysis of the closed form of dimeric citrate synthase has been performed. The largest-amplitude collective motion predicted by this method compares well with the crystallographically observed hinge-bending motion. Such a result supports those obtained previously in the case of hinge-bending motions of…
The carbon storage regulator gene csrA has been shown previously to dramatically affect the biosynthesis of intracellular glycogen in Escherichia coli through its negative control of the expression of two glycogen biosynthetic operons and the gluconeogenic gene pckA (Romeo, T., Gong, M., Liu, M. Y., and Brun-Zinkernag…
Following a major shortage of 99Mo in the 2009–2010 period, concern grew that the aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as the target material. The Organisation for Economic Co-...Read More
Porous polymer films with a regular arrangement of pores (see figure) with a narrow pore size distribution have recently been reported. The preparation of the films from a variety of star polystyrenes, micellar polystyrenes, and block copolymers, the mechanism of formation, and the potential applications of the materi…
The synthesis and characterization of a system for the study of molecular recognition phenomena are described. The system involves a tetraurea molecule that is capable of assembly into various associated states through hydrogen bonding. In organic solvents, the dynamic transition between a low-ordered (aggregate) stat…
Extraction of structure-factor amplitudes from a powder diffraction pattern is not a straightforward procedure. Peak overlapping and background estimation are the main obstacles to the process: they may introduce strong correlations among reflection intensities and heavy errors in their estimates. The program EXTRA is…
We present a detailed study on the effects of applied hydrostatic pressure on the magnetoresistance in doped LaMn${\mathrm{O}}_{3}$ at fixed doping level. In all cases, the application of external pressure monotonically increases the Curie temperature. This is compared with the application of "internal" pressure, whic…