Materials Literature
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Photoluminescence spectra were measured on homogeneously doped silicon at temperatures of 90 and 295 K. By using the generalized Planck law for the emission of luminescence by indirect transitions, values for the absorption coefficient as small as ${10}^{\ensuremath{-}16}$ ${\mathrm{cm}}^{\ensuremath{-}1}$ have been o…
Hydrogen-oxidizing bacterium, Alcaligenes eutrophus autotrophically produces biodegradable plastic material, poly(D-3-hydroxybutyrate), P(3HB), from carbon dioxide, hydrogen, and oxygen. In autotrophic cultivation of the microorganism, it is essential to eliminate possible occurrence of gas explosions from the ferment…
Abstract The design, synthesis, characterization, and understanding of new molecular and macromolecular assemblies with large macroscopic optical nonlinearities represents an active field of research at the interface of modern chemistry, physics, and materials science. Challenges in this area of photonic materials typ…
Shape Memory Alloys (SMA) are characterized by a unique solid-solid phase transition during which significant strains are observable. On reversal of this phase transition, the strains also are almost completely recoverable. When properly constrained, a shape memory alloy is capable of producing large actuation forces.…
Shape memory alloy (SMA) materials such as nitinol have unique properties associated with the shape recovery effect and the material's phase changes that have been used in a variety of actuator and sensing applications. By embedding SMA elements into host composite materials, control or modification of the SMA hybrid…
Calculations on lens systems are often marred by the unjustifiable use of the small-angle approximation. This book describes in detail how the ray and wave pictures of lens behaviour can be combined and developed into a theory capable of dealing with the large angles encountered in real optical systems. A distinct adv…
Article Growth Behaviour and Subgrain Structure of W2B5 / Wachstumsverhalten und Subkorn-Struktur von W2B5 was published on February 1, 1995 in the journal International Journal of Materials Research (volume 86, issue 2).
Abstract Fracture toughness values of phenolphthalein poly(ether ketone) (PEK‐C) at 190°C were determined by two different methods, i.e. the conventional crack growth method and the crack stress whitening zone method, which show consistent results. This indicates that the crack stress whitening zone method can be used…
A new series of optically active compounds have been prepared using 4,4″-terphenyldicarboxylic acid and S-2-alcoxypropanols-1. These are Sm*C, SmA and N* chemically stable - especially with regard to racemization and UV-light compounds with a small PS value, high twisting power and left handedness of helix.
A beamline for macromolecular crystallography has been designed for the ALS. The source will be a 37-pole wiggler with a 2-T on-axis peak field. The wiggler will illuminate three beamlines, each accepting 3 mrad of horizontal aperture. The central beamline will primarily be used for multiple-wavelength anomalous dispe…
Lyotropic micellar nematic and smectic phases observed in the mixture of sodium oleate and glacial acetic acid has been studied by X-ray and optical methods. It is found that a nematic phase is observed with small concentration of sodium oleate at higher temperatures. Smectic A and Smectic E phases also occur at lower…
The results of high hydrostatic pressure studies of martensitic transformations in alloys with special emphasis to shape memory alloys (SMA) are reviewed. Experimentally detected positive and negative signs of MS temperature pressure shift and phase p-T diagrams are discussed. High pressure induced shape memory effect…
Abstract The resonance Raman spectrum of bis(isomaleonitriledithiolato)nickelate(II) was investigated in order to assess the extent of the electronic delocalization within the chromophore. Previous results for the isomeric species bis(maleonitriledithiolato)nickelate(II) indicated an extensive delocalization involving…
A linear stability analysis of the undulatory instability of the nematic-isotropic (N-I) interface under a vertical magnetic field is presented. It is shown that the boundary conditions on the lower surface of the nematic layer have a very significant influence on the threshold characteristics. Furthermore, in the cas…
Results of generalized valence bond plus configuration interaction calculations for the potential curves and spectroscopic constants of the two lowest lying electronic states of the MgC molecule are presented. The <SUP>3</SUP>Σ<SUP>-</SUP> state was found to be the ground state but with the <SUP>5</SUP>Σ<SUP>-</SUP> s…
Hillock formation on Pt bottom electrode surfaces has been investigated for 〈111〉 Si and sapphire substrates. This paper correlates the electrical performance of Pt/PZT/Pt structured capacitors with the observed surface roughness and/or hillock presence on the Pt bottom electrode.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReassessment of Khazanovich's Theory of Thermal Diffusion of Polymers in SolutionMichael BenderCite this: Macromolecules 1995, 28, 4, 1309–1311Publication Date (Print):February 1, 1995Publication History Published online1 May 2002Published inissue 1 February 1995https://pubs…
The purpose of this presentation is to provide some perspective gained from recent studies in condensed matter physics on the microscopic processes by which martensitic transformations take place to supplement the highly developed crystallographic and thermodynamic descriptions. Atomic scale dynamics can be related to…
A simple method for the preparation of monophasic β‐SiAlON using nitridation of Si and AIN with an oxygen partial pressure of 10 ‐4 atm is described. The effect of the AIN/Si ratio in the initial mixture on the formation of β‐SiAlON is discussed. The likely mechanism of the formation of β‐SiAlON is outlined.
<div class="htmlview paragraph">The accuracy of an accident reconstruction is dependent upon the availability and quality of relevant data. Often by the time an engineer is asked to reconstruct a traffic accident the only source of scene data is a police report. Important scene data, such as the point of impact…