Materials Literature
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Three-dimensional textiles are those materials which have a system or systems in all the three axes of plane. These offer particular properties, such as interlaminar shearing force, and mechanical and thermal stability along all three axes of space, which are not achievable with other reinforcements. The demand for th…
For many years, the petroleum industry has employed martensitic stainless steels for wellhead and valve applications, and increasing use has been made of 13%Cr-4%Ni alloys. This material type was originally developed as a cast alloy (e.g., ASTM A487/A487M-89a Grade CA6NM). The combination of a low-carbon content and t…
Abstract Double yield points before necking were observed in injection molded specimens of poly(tetramethylene terephthalate) (PTMT) and its copolymers under tensile loading. The first yield is associated with deformation of the amorphous region and the second yield is caused by the alpha to beta transition of PTMT cr…
The fact that mercury is released from dental amalgam restorations after abrasion provides a source of continued controversy over the safe use of this material. Studies have shown that the amount and rate of mercury release vary for different amalgam products. The objective of this study was to determine how alloy com…
The Curie temperature of dysprosium films epitaxially grown on yttrium and on erbium is shown to increase continuously with the epitaxial strain induced along the c -axis. This variation is correlated to modifications of the α strains, of the γ distortion and of the exchange energy barrier. The evolution of these diff…
Using an expanding cascaded arc plasma jet, amorphous hydrogenated and fluorohydrogenated carbon films were deposited on silicon, glass, and steel substrates at high rates of tens of nanometers per second and on large areas of up to 100 cm2. The present work was aimed at depositing amorphous carbon films suited for op…
Higly disperse copper oxides are widely used as catalysts for industrial processes, for example in methanol synthesis. The supports used for these catalysts hamper their characterization of the copper oxide species involved. Here, a procedure for the preparation of unsupported, nanostructured, and pure Cu 2 O samples…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Complexation Studies of Regioisomers and Conformational Isomers of p-tert-Butylcalix[4]arene Bearing Pyridine or Pyridine N-Oxide Pendant Groups at the Lower RimSebastiano Pappalardo, George Ferguson, Placido Neri, and Concetta RoccoCite this: J. Org. Chem. 199…
Abstract Serpentine soils show high contents of Cr and Ni. Acidification may convert the metals bound in silicate structures into bioavailable forms. The effects of mineral acids on a serpentine‐derived Typic Hapludoll were examined in column studies. Cadmium and Pb were also examined. One end of the soil‐packed colum…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn Unsymmetric Trinuclear Chromium(III) Oxo Carboxylate Assembly: Structure and Characterization of Cr3O(O2CPh)4(8-hqn)3.cntdot.1.25CH2Cl2Maysa K. Nagi, Anthony Harton, Scott Donald, Young-Sook Lee, Michal Sabat, Charles J. O'Connor, and John B. VincentCite this: Inorg. Chem…
The tip of a scanning tunneling microscope (STM) was used to inject electrons into thin Pt layers of metal–oxide–semiconductor (MOS) structures. The collector currents emanating from the n-type Si(100) substrates were measured as a function of the electron energy, determined by the STM tip bias VT, for different oxide…
We have performed a molecular dynamics computer simulation study to investigate the dynamical behavior of a supercooled simple liquid for comparison with the predictions of mode-coupling theory (MCT). By scaling the intermediate scattering function by the α-relaxation time r we find that the correlators fall onto a ma…
Reusable, oxidation-protected reinforced carbon-carbon has been successfully flown on all Shuttle Orbiter flights. Thermal testing of the silicon carbide-coated, reinforced carbon-carbon to determine its oxidation characteristics has been performed in convective (plasma Arc-Jet) heating facilities. Surface sealant mas…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Electronic Structure of Substituted Aromatic Dithiolene Complexes of Gold(III)N. C. Schiodt, P. Sommer-Larsen, T. Bjornholm, M. Folmer Nielsen, J. Larsen, and K. BechgaardCite this: Inorg. Chem. 1995, 34, 14, 3688–3694Publication Date (Print):July 1, 1995Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron Spin Resonance and Electron Spin Echo Modulation Study of Ni(I) in Silicoaluminophosphate Type 5: Adsorbate Interactions and Evidence for the Framework Incorporation of Ni(I)Martin Hartmann, Naoto Azuma, and Larry KevanCite this: J. Phys. Chem. 1995, 99, 27, 10988–1…
Abstract Propane was catalytically oxidized to acrylic acid and acetic acid with molecular oxygen at 360 °C over heteropolymolybdophosphoric acids which were treated with pyridine in the catalyst preparation. Under presently optimized reaction conditions 24% selectivity to acrylic acid and 15% to acetic acid were achi…
Proclavaminate amidino hydrolase (PAH) catalyzes the reaction of guanidinoproclavaminic acid to proclavaminic acid and urea, a central step in the biosynthesis of the beta-lactamase inhibitor clavulanic acid. The gene encoding this enzyme (pah) was tentatively identified within the clavulanic acid biosynthetic cluster…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHitherto Ignored Effects of Chain Length on the Flory-Huggins Interaction Parameters in Concentrated Polymer SolutionsHans-Michael Petri, Norbert Schuld, and B. A. WolfCite this: Macromolecules 1995, 28, 14, 4975–4980Publication Date (Print):July 1, 1995Publication History P…
The CaO—Al 2 O 3 — CaSO 4 —CaCO 3 -H 2 O closed system at 25°C has been investigated by thennodynamic calculations: eight isothermally invariant points have been determined. From these points, the composition of the solutions coexisting at equilibrium with ettringite, calcium hemicarboaluminate and/or calcium monocarb…
Dielectric spectroscopy and calorimetry studies of a low viscosity, initially monomeric liquid undergoing spontaneous chemical reaction, to form a linear chain polymer while maintaining isothermal conditions, have been used to determine how the number of covalent bonds formed during the growth of a linear chain affect…