Materials Literature
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Temperature and frequency dispersion of dielectric permittivity was investigated on thin amorphous films of SrTiO3 prepared by a sputtering method using neutralized argon-ion beams. The amorphous SrTiO3 films deposited on glass substrates exhibited a marked dielectric relaxation at temperatures 500–800 K in a frequenc…
The mechanics for the development and relaxation of stresses in films is briefly reviewed. The discussion initially focuses on how stresses are distributed within a film and substrate, and on the resultant deformations that these stresses induce. Although the particular case of an elastically homogeneous system with a…
Neutron powder diffraction data for MoO2 [P21/c, a 5.6102(3), b 4.8573(2), c 5.6265(3) ?, ß 120.915(2)°] and WO2 [P21/c, a 5.5769(2), b 4.8986(1), c 5.6644(2) ?, ß 120.678(1)] have been employed to refine structural parameters by the Rietveld method. The results confirm previous studies but have considerably greater p…
Pulsed laser melting experiments were performed on GexSi1−x alloys (x≤0.10) with regrowth velocities ranging from 0.25 to 3.9 m/s. Analysis of post-solidification Ge concentration profiles, along with time-resolved melt depth measurements, allowed determination of the liquid-phase diffusivity Dl for Ge in Si and the d…
SUMMARY 1. During the spring of 1992, fifty‐two quantitative diatom samples were collected from twenty‐eight rivers located in the Tokyo Metropolitan area, Japan, to study the response of the diatom assemblages to water pollution (assessed using physical and chemical data determined monthly from April 1987 to March 19…
We present a theoretical and numerical study of the coupling of orientational and positional order in a smectic-A phase of hard rods. Our density functional analysis suggests a strong spatial modulation of the orientation distribution function. Computer simulations confirm this prediction and show that the modulation…
Abstract Experimental and numerical studies on and sand–steel interfaces are presented. Emphasis is laid on the effect of boundary conditions of the whole system and of localized deformation. The experiments with different roughness of steel surface, sand density, normal stress and grain size are carried out in a plan…
Results are presented of a neutron powder diffraction experiment performed at room temperature on the Nd2Fe14BHx series. The location of the hydrogen (or deuterium) atoms within the crystal lattice is described. After an analysis of the crystal structure of Nd2Fe14B, Nd2Fe14BH, Nd2Fe14BH2, Nd2Fe14BH3, and Nd2Fe14BH4,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature-Dependent Crystalline-Amorphous Structures in Linear Polyethylene: Surface Melting and the Thickness of the Amorphous LayersT. Albrecht and G. StroblCite this: Macromolecules 1995, 28, 17, 5827–5833Publication Date (Print):August 1, 1995Publication History Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyphosphazenes with High Refractive Indices: Synthesis, Characterization, and Optical PropertiesMichael A. Olshavsky and Harry R. AllcockCite this: Macromolecules 1995, 28, 18, 6188–6197Publication Date (Print):August 1, 1995Publication History Published online1 May 2002Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic Consequences of Nonplanar Core Conformations in Electron-Deficient Porphyrins: The Structure and Spectroscopic Properties of [5,10,15,20-Tetrakis(heptafluoropropyl)porphinato]cobalt(II)Stephen G. DiMagno, Alan K. Wertsching, and Charles R. Ross IICite this: J. Am.…
Transcription of the Bacillus subtilis pur operon is repressed in response to a signal of excess adenine. We have purified the repressor protein and have identified, cloned, and overexpressed the purR regulatory gene that controls transcription initiation of the operon. B. subtilis purR encodes a 62-kDa homodimer that…
The four-helix bundle motif occurs in many structural contexts and in proteins that are functionally diverse. The motif can be classified into individual folds on the basis of topological and geometric properties. It has been thoroughly investigated structurally by both nuclear magnetic resonance and x-ray crystallogr…
A homogeneous-nucleation-based crystallization was found in o-terphenyl in the glass-transition temperature region with an adiabatic calorimeter, and the crystallization process was investigated by direct microscopic observation. The crystallization showed its maximum rate at 248 and ceased at 250 K, while the ordinar…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSize-Dependent Separation of Colloidal Particles In Two-Dimensional Convective Self-AssemblyMariko Yamaki, Junichi Higo, and Kuniaki NagayamaCite this: Langmuir 1995, 11, 8, 2975–2978Publication Date (Print):August 1, 1995Publication History Published online1 May 2002Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTXANES-TPR Study of Cu-Pd Bimetallic Catalysts: Application of Factor AnalysisM. Fernandez-Garcia, C. Marquez Alvarez, and G. L. HallerCite this: J. Phys. Chem. 1995, 99, 33, 12565–12569Publication Date (Print):August 1, 1995Publication History Published online1 May 2002Publi…
Molecular-dynamics simulations of monatomic liquids interacting via a modified Johnson potential have been carried out to investigate the structure of liquids and the microscopic mechanism of the glass transition. The structure of liquids is described in terms of spherical harmonic representations of topology of local…
Monitoring the formation of ultrathin films by scanning force microscopy provides information, for example, on the concentration dependence of the film structure (the Figure shows micelle agglomeration from high concentration solutions to form a layer with holes) and insight into the process from micelle formation to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Liquid Crystal Opto-optical Switch: Nondestructive Information Retrieval Based on a Photochromic Fulgide as TriggerSlawomir Z. Janicki and Gary B. SchusterCite this: J. Am. Chem. Soc. 1995, 117, 33, 8524–8527Publication Date (Print):August 1, 1995Publication History Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of Preadsorbed Block Copolymers on Protein Adsorption: Surface Properties, Layer Thickness, and Surface CoverageC. G. P. H. Schroen, M. A. Cohen Stuart, K. van der Voort Maarschalk, A. van der Padt, and K. van't RietCite this: Langmuir 1995, 11, 8, 3068–3074Publica…