Materials Literature
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We made a high-efficiency ref lection grating by coating a nine-layer quarter-wave system of ZnS/Na(3)AlF(6) directly onto a surface-relief grating in photoresist. Eff iciencies of 70% and 84% were measured at the firstorder Littrow mount with the laser beam incident from the air side and from the substrate side, resp…
The bioenergetic response of the extremely thermoacidophilic archaeon Metallosphaera sedula to thermal and nutritional stresses was examined. Continuous cultures (pH 2.0, 70(deg)C, and dilution rate of 0.05 h(sup-1)) in which the levels of Casamino Acids and ferrous iron in growth media were reduced by a step change o…
Duplex stainless steels have become important competitors to austenitic stainless steels in many applications and a great deal of attention has focused on the welding aspects. The introduction of modern grades with improved properties and a competitive price level have increased their use in the offshore, petrochemica…
Adjuvants were evaluated to determine the effect on increasing spray droplet size and reducing the amount of spray dispensed in small driftable size particles when applying water and paraffinic oil at ultralow volume. Spray solutions were applied with an air-assist system at liquid flow rates of 28 and 56 ml/min and a…
Modified double-loop electrochemical potentiokinetic reactivation (DL-EPR) tests were applied to evaluate the degree of sensitization (DOS) for alloy 600 (UNS N06600) aged at 700°C. Results of the modified DL-EPR test were compared to intergranular stress corrosion cracking (IGSCC) susceptibilities determined in deaer…
Pyroelectric coefficients were measured from a series of natural tourmaline crystals between -170 and - 500 K to quantify the variation of the pyroelectric effect with chemical composition. The amount of Fe in tourmaline has a prominent influence on the pyroelectricity. Fe content linearly decreases the pyroelectric c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Characterization of Poly(thiophenes) Functionalized by Photochromic Spironaphthoxazine GroupsA. Yassar, C. Moustrou, H. Korri Youssoufi, A. Samat, R. Guglielmetti, and F. GarnierCite this: Macromolecules 1995, 28, 13, 4548–4553Publication Date (Print):June 1, 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProcessing-Induced Changes in the Local Structure of Amorphous Polyaniline by Radial Distribution Function Analysis of X-ray Scattering DataJ. Maron, M. J. Winokur, and B. R. MattesCite this: Macromolecules 1995, 28, 13, 4475–4486Publication Date (Print):June 1, 1995Publicat…
This is the first of a two-part molecular dynamics (MD) study that examines the effects of temperature, pressure, and composition on the structure and properties of ten compositions in the system NaAISiO.-Si02. Results were obtained for collections of at least 1300 atoms at temperatures between 2500 and 4500 K, pressu…
Abstract Selective non‐catalytic reduction of nitric oxide (NO) using ammonia was studied with up to 15% (by volume) oxygen at 102 kPa. The experiments were conducted in an electrically heated laminar‐flow, quartz reactor using mixtures of N 2 , O 2 , NO, and CO to simulate exhaust gas. The base case condition include…
One approach to tissue-engineering combines isolated cells with polymer scaffolds for the purpose of generating new tissue or tissue equivalents. It has met with much success when applied to the formation of new cartilage (neo-cartilage). In this review, we will examine the development of polyglycolic acid fiber meshe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDipole Moments, Energetic Disorder, and Charge Transport in Molecularly Doped PolymersRalph H. Young, John A. Sinicropi, and John J. FitzgeraldCite this: J. Phys. Chem. 1995, 99, 23, 9497–9506Publication Date (Print):June 1, 1995Publication History Published online1 May 2002…
The role of fiber moisture sorption behavior in the sensory perception of dampness in fabrics has been investigated both experimentally and mechanistically. The way in which water is held in fabrics influences the thermal transients that occur during skin contact. Fabrics with water content in excess of the equilibriu…
Radiolabelled glucose was added to a batch culture of Alcaligenes eutrophus during the accumulation of poly(3-hydroxybutyrate) (PHB) to label newly synthesized polymer. The specific radioactivity of the polymer continued to increase, by approximately 30%, after the cessation of PHB accumulation, indicating that turnov…
Abstract Crystallization from the melt of nylon 66 in the presence of carbon fiber, aramid fiber, or nucleating agent was studied using differential scanning calorimetry (DSC) and hot stage microscopy. The use of the nucleating agent resulted in an increase in crystallization rate and a decrease of induction time unde…
Ni-α-Al2O3 metal-ceramic composites with metal loadings ranging from 33 to 67 vol.% were synthesized via a sol-gel (both polymeric and colloidal) technique. The polymeric route involves introducing nickel formate during the hydrolysis and condensation of aluminum isopropoxide while the colloidal route involves precipi…
The effects of oxidation in air and corrosion in high‐temperature, high‐pressure water on the mechanical properties of three commercially available amorphous Si‐Ti‐C‐O (Tyranno) fibers with different oxygen contents (12%–18%) and diameters (8–11 μm) were investigated. The fibers were exposed to isothermal treatments a…
Aqueous mixtures of zirconium acetate and aluminum nitrate were pyrolyzed and crystallized to form a metastable solid solution, Zr 1‐ x Al x O 2− x /2 ( x < 0.57). The initial, metastable phase partitions at higher temperatures to form two metastable phases, viz., t −ZrO 2 +γ‐Al 2 O 3 with a nano‐scale microstructu…
The crystal structures of a synthetic H-bearing aluminous stishovite, containing approximately 1.6 wt% Al<sub>2</sub>O<sub>3</sub>, and a pure-silica stishovite have been refined from three-dimensional, single-crystal X-ray diffraction data. The space group of both is P4<sub>2</sub>/mnm, and the unit cell parameters o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFrequency-Dependent Second-Order Hyperpolarizability of Carbon Clusters: A Semiempirical InvestigationMarianna Fanti, Giorgio Orlandi, and Francesco ZerbettoCite this: J. Am. Chem. Soc. 1995, 117, 22, 6101–6108Publication Date (Print):June 1, 1995Publication History Publishe…