Materials Literature
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Abstract Earlier interpretations of the conversion of the virgin smectite of the Ordovician Kinnekulle K-bentonites into the present mixed-layer illite/smectite imply that it took place through charge increase of the smectite with subsequent uptake and fixation of potassium. Recent analyses show that the layer charge…
Stromelysins, which are the metalloproteinases with the widest substrate specificities, play a critical role in tumor invasion and metastasis. We have previously reported an element (SPRE) of the stromelysin promoter located between nucleotides -1221 and -1203 that is necessary and sufficient for the control of strome…
In this paper two kinds of weak boundary layers (WBL) in synthetic vulcanized styrene-butadiene rubber are described. i) WBL produced by the presence of antiadhesion compounds of the rubber formulation (zinc stearate, microcrystalline paraffin wax). These WBL cannot be effectively removed by solvent wiping, whether fo…
Abstract Crosslinked poly(ethylene glycol)‐ block polybutadience block copolymers were obtained by coupling reaction of polybutadiene (PBd) with macromonomer azo initiators (macroinimers) or polyazoesters (PAE) in moderate yield (22–75%). NMR and FT‐IR spectroscopy measurements were used to characterize and determine…
Abstract The ozone decomposition reaction to molecular oxygen was studied in a flow reactor on a MnO2 / γ-Al2O3 / cordierite catalyst. The rate expression is found to depend on ozone concentration, rO3 = k(O3)0.68, but not on O2 or H2O partial pressure. A reaction sequence based on an ionic type intermediate with supe…
Boron nitride (BN) matrix composites reinforced by a number of different ceramic fibers have been prepared using a low‐viscosity, borazine oligomer which converts in very high yield to a stable BN matrix when heated to 1200°C. Fibers including Nicalon (SiC), FP (A1 2 O 3 ), Sumica and Nextel 440 (Al 2 O 3 ‐SiO 2 ) wer…
Abstract Cu(II) and Ni(II) complexes with three grades of carboxymethyl cellulose (CMC) with different degrees of substitution have been synthesized and characterized. Probable structures of the metal complexes are inferred from the electronic and IR spectra, elemental analysis data and magnetic moment measurements. C…
The melt-solid interface of hard spheres is studied by atomistic simulations and density-functional theory (DFT). The Monte Carlo method is used to compute density profiles for the three most important orientations of the fcc-solid--melt interface. The interface ranges in thickness from 4d for the loosely packed (110)…
The phase development, microstructure development, and Curie temperature of PbO‐BaO‐TiO 2 ‐Al 2 O 3 ‐SiO 2 glass‐ ceramics were investigated by X‐ray diffractometry, electron microscopy, and dilatometry. The primary crystalline phase was perovskite titanate, which exhibited bulk nucle‐ ation. When the samples were hea…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransformations of Quinic Acid. Asymmetric Synthesis and Absolute Configuration of Mycosporin I and Mycosporin-glyJames D. White, Janice H. Cammack, Kazuhiko Sakuma, Gordon W. Rewcastle, and Rexford K. WidenerCite this: J. Org. Chem. 1995, 60, 12, 3600–3611Publication Date (…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemical Metal-to-Oxo Migrations of Aryl and Alkyl LigandsSeth N. Brown and James M. MayerCite this: Organometallics 1995, 14, 6, 2951–2960Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published inissue 1 June 1995https://pubs.acs.or…
Transient test data and posttest measurements from recent in-pile overpower transient experiments are used for an in situ determination of metallic fuel thermal conductivity. For test pins that undergo melting but remain intact, a technique is described that relates fuel thermal conductivity to peak pin power during t…
Stress corrosion cracking (SCC) test specimens of Al-Li- Cu alloy that were subjected to fixed-displacement loading and exposed to aerated 35 wt% sodium chloride (NaCl) solution for 1 week failed < 24 h after removal into ambient atmospheres. Anodic dissolution-based mechanisms proposed previously for this phen…
Abstract Scanning electron microscopy has revealed the presence of spherical, lath and platy kaolinite in gels with Si/Al atomic ratio ranging from 1.84 to 0.76 that are hydrothermally treated under different temperature and time conditions. Hemispherical structures and excavated zones, at different stages of evolutio…
Measurement of the activation energy for electromigration in polycrystalline copper films under clean surface, ultra-high vacuum (<10su−10Torr) conditions has been carried out. An isothermal electrical resistance method was used and a value of 0.47 ± 0.03 eV was obtained. This result suggests that under clean surface…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHyperpolarizabilities of Organic Molecules: Ab Initio Time-Dependent Coupled Perturbed Hartree-Fock-Roothaan Studies of Basic Heterocyclic StructuresVijaya Keshari, Wijekoon M. K. P. Wijekoon, Paras N. Prasad, and Shashi P. KarnaCite this: J. Phys. Chem. 1995, 99, 22, 9045–9…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution Conformations of Patellamides B and C, Cytotoxic Cyclic Hexapeptides from Marine Tunicate, Determined by NMR Spectroscopy and Molecular DynamicsToshimasa Ishida, Yasuko In, Fumiyoshi Shinozaki, Mitsunobu Doi, Daisuke Yamamoto, Yasumasa Hamada, Takayuki Shioiri, Miyo…
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…