Materials Literature
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A two‐dimensional numerical model is developed to simulate nonisothermal performance of molten carbonate fuel cells. The model takes account of gas stream utilization due to electrochemical reaction, conductive heat transfer between cell hardware and gas streams, energy transfer accompanying mass addition to the bulk…
The purpose of this study is to investigate the feasibility of pure titanium to the metal-porcelain system.Since thermal expansion coefficient of pure titanium was 9.41×10-6/°C (100-400°C) and was considerably smaller than those of the conventional alloys for porcelain, a porcelain having the thermal expansion coeffic…
A survey is given of simple predictive models and operational definitions of the metallic state. The purpose of this work is to highlight the essential features of electron localization versus itinerancy in both crystalline and disordered materials. Particular attention is given to systems that not only extend to the…
The synthesis of the ‘both-faces’ hindered porphyrins using two different methods is reported. These so-called ‘basket-handle’ porphyrins (BHP) are derived from 5,10,15,20-tetraphenylporphyrin in which two opposite phenyl groups are bridged by alkylene or arylene-p-bisalkylene chains. In addition to the desired compou…
Description This publication presents research data covering corrosion and fracture mechanics of metals, primarily steel, aluminum, and titanium. The papers presented are primarily research in nature although several papers deal with application technology. The papers address: mechanics and basic metal characteristics…
The crystalline→noncrystalline (metamict) transformation in α-quartz under electron irradiation has been studied by transmission electron microscopy (TEM), ultra-high resolution structure imaging (SI) and convergent beam electron diffraction (CBD). The transformation is radiolytic and proceeds in two stages: heterogen…
Other| January 01, 1983 Theoretical and experimental study of fabrics developed by different shaped markers in two-dimensional simple shear Angel Fernandez; Angel Fernandez Author BRGM, FranceDep. geol. mineral., Clermont-Ferrand 63038, France Search for other works by this author on: GSW Google Scholar Jean-Louis Fey…
A biphasic H2O–C6H6 system, which has MnIII(tetraphenylporphyrin)(Cl) and a phase transfer agent as catalysts and ascorbate as a reducing agent, activates dioxygen leading to selective epoxidation of olefins and hydroxylation of alkanes under mild conditions.
Abstract Eleven well-drained soils formed in till parent materials of varying ages in northeastern Pennsylvania were studied to determine changes in the soils with time. Four profiles (three Lackawanna and one Bath) were formed in Woodfordian till (15,000 yr B.P.), and two (Leck Kill) were formed in Altonian till (>…
The short-time self-mobilities of spherical colloidal particles in concentrated liquid suspensions were measured by photon correlation spectroscopy. For volume fractions Φ ≳ 0.3, theory incorporating two-particle hydrodynamic interactions was not adequate to describe the data, indicating the importance of many-particl…
Electrolytic polymerization of thiophene gives a metallic film with a conductivity of ca. 100 S/cm, and which becomes a semiconductive polymer with an optical absorption edge of 2.0 eV when reduced by electrochemical or chemical means.
Techniques to control metal particle size in a supported catalyst have been investigated. The mean particle size of nickel increases with an increase in the concentration of metal in the catalyst, varying from 2.2 to 25.8% in weight. The effects of metal particle size on reaction selectivity are explained in terms of…
The pyrBI operon of Escherichia coli K-12 encodes the subunits of the pyrimidine biosynthetic enzyme aspartate transcarbamylase (carbamoylphosphate:L-aspartate carbamoyltransferase, EC 2.1.3.2). Expression of this operon apparently is negatively regulated by the intracellular levels of UTP. To elucidate the regulatory…
Below the consolute point of a binary mixture, the presence of a wall which adsorbs preferentially one of the two liquids may induce a new transition, the wetting transition. Above the wetting temperature Tw the phase adsorbed by the wall forms a macroscopic film. This transition has recently been analysed in the fram…
Abstract
A unique theoretical framework is shown to interpret not less than seven different smectic phases observed or expected in polar systems. A free energy with two coupled order parameters having a tendency to condense at two incommensurate wavevectors is used.
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPorphyrinic molecular metalsBrian M. Hoffman and James A. IbersCite this: Acc. Chem. Res. 1983, 16, 1, 15–21Publication Date (Print):January 1, 1983Publication History Published online1 May 2002Published inissue 1 January 1983https://doi.org/10.1021/ar00085a003RIGHTS & PERMI…
The thermal monomerization of 9-cyanoanthracene photodimer (9CNAD) single crystals has been studied using differential scanning calorimetry (d.s.c.) jointly with emission spectroscopy of cleaved surfaces of partially monomerized 9CNAD single crystals. The first exothermic peak, together with the subsequent peaks, is a…
A rapid method is presented for the determination of gypsum and related minerals in natural and synthetic materials, based on the extraction of calcium from the matrix material using slightly ammoniacal water as a solvent with subsequent complexometric titration of the calcium using EDTA. The results compare reasonabl…