Materials Literature
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The oxidation process of Si 2 N 2 O, prepared by a hot isostatic pressing technique, has been studied by the thermogravimetric method. The oxidation has been performed in oxygen for 20 h in the temperature range 1300° to 1600°C, producing oxide scales of amorphous SiO 2 and α‐cristobalite. The weight gain for T 1350°C…
The magneto-optical, polar Kerr effect of polycrystalline ${\mathrm{CrO}}_{2}$ has been studied in the range 0.8--5 eV. The maximum Kerr rotation amounts to \ensuremath{\Vert}${\mathrm{\ensuremath{\theta}}}_{\mathit{K}}$\ensuremath{\Vert}=0.154\ifmmode^\circ\else\textdegree\fi{} at 3.7 eV. Two different interpretation…
Rhodococcus ruber NCIMB 40126 synthesizes copolyesters (polyhydroxyalkanoates) of 3-hydroxybutyrate (3HB) and 3-hydroxyvalerate (3HV), containing primarily 3HV monomer units, from a variety of single, chemically unrelated substrates. The 3HV content of the polymer is dependent on the choice of substrate and succinic a…
Theoretical yields of poly-d(−)-3-hydroxybutyrate (PHB) from several carbon sources have been estimated from biochemical pathways leading to PHB. In estimating the yields, a special emphasis is made on recycling (or regeneration) of NADP+ which is the co-substrate of acetoacetyl-CoA reductase, one of three key enzymes…
Ferroelectric Bi 4 Ti 3 O 12 films have been prepared through the sol-gel process from corresponding metal alkoxides, which were chemically modified. The homogeneous films of the Bi 4 Ti 3 O 12 single phase were obtained on Pt substrates by the heat-treatment at 500°C, under optimum conditions of process parameters su…
A boric acid‐stabilized aluminum acetate powder was decomposed to aluminum borate (Al 18 B 4 O 33 ) by calcining at 1000°C. The powder was then ball‐milled, compacted, and fired to temperatures of 1500°, 1600°, and 1700°C for a period of 1 h. The resulting aluminum borate ceramic had a whiskerlike grain morphology, wi…
Abstract The evaluation of the long periods and crystallite lengths of original and pretreated solvent spun cellulose fibres revealed that they consist of about 90% crystalline cellulose in the direction of the fibre axis. In the case of high wet modulus viscose fibres this percentage is only 50–60%. The intensity of…
High-resolution I 4d photoelectron spectra (total instrumental resolution ∼0.06 eV) of seven simple iodine molecules, ICl, IBr, I2, HI, CH3I, CH2I2, and CF3I, have been recorded. Ligand-field splitting (as measured by the asymmetric C20 crystal-field term) splits the 4d3/2 and 4d5/2 lines into a doublet and triplet, r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA high-nuclearity polyoxoalkoxomolybdate cluster encapsulating a [Na(H2O)3]+ moiety. Hydrothermal synthesis and structure of [Na(H2O)3H15Mo42O109{(OCH2)3CCH2OH}7]7-M. Ishaque Khan and Jon ZubietaCite this: J. Am. Chem. Soc. 1992, 114, 25, 10058–10059Publication Date (Print):…
SiC‐platelet‐reinforced Al 2 O 3 ‐matrix composites were made by three different forming techniques, i.e., slip casting, tape casting, and dry compaction of a granulated powder. All samples were densified with hot pressing at 1650°C and 25 MPa for 0.5 h. The orientation of SiC platelets in the composites was studied b…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescence and intramolecular energy-transfer processes in isomeric cyano-bridged rhenium(I)-rhenium(I) and rhenium(I)-ruthenium(II)-rhenium(I) polypyridyl complexesK. Kalyanasundaram, M. Graetzel, and M. K. NazeeruddinCite this: Inorg. Chem. 1992, 31, 25, 5243–5253Publica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface chemistry of magnesium oxide-supported molybdenum oxide: an in situ Raman spectroscopic studySi Chung Chang, M. Anne Leugers, and Simon R. BareCite this: J. Phys. Chem. 1992, 96, 25, 10358–10365Publication Date (Print):December 1, 1992Publication History Published on…
Abstract Currently, selection of screw configurations as well as the operating conditions for compounding polymer blends with desired morphology in a co‐rotating twinscrew extruder is an art based on experience. In this paper a quenching section of a twin‐screw extruder is described. The section may replace any segmen…
Bulk nucleation has been studied for glasses within the Y 2 O 3 –Al 2 O 3 –SiO 2 system, using a two‐stage nucleation and growth heat treatment. The crystalline phases formed have been identified. Annealing in an inert atmosphere is required in order to prevent surface nucleation from dominating the results. Despite t…
Abstract X-ray diffraction (XRD) patterns of a pore-lining diagenetic chlorite (14 Å) from a reservoir sandstone, offshore Norway, show broad odd-order and sharp even-order basal reflections indicating that it contains 7 Å layers. Using NEWMOD, simulated XRD patterns with 15% 7 Å serpentine layers and a maximum crysta…
ABSTRACT Studies of the life cycle of a centric diatom, tentatively identified as Stephanodiscus neoastraea Håkansson & Hickel, showed that sexual reproduction occurred every year in a freshwater lake (Lough Neagh, Northern Ireland). Male and female gametes were produced in cells below 55% of the maximum diameter…
We present numerical calculations of the quantum diffusion over an octagonal quasiperiodic tiling. We have studied a one-parameter family of Hamiltonians including the pure hopping case, the Laplacian, and a regime where atomic potentials prevail. We have found that unlimited diffusion occurs with anomalous exponents…
The water vapor transmission rate as a function of the physical and morphological properties of edible barriers containing methyl cellulose and fatty acids (C:14-C:22) were quantified. Barrier morphology was defined via fluorescence microscopy coupled with digitized image analysis. Stearic acid: cellulose barriers exh…
Francisco Rodriguez-Valera, José A.G. Lillo; Halobacteria as producers of polyhydroxyalkanoates, FEMS Microbiology Reviews, Volume 9, Issue 2-4, 1 December
We have studied the spreading of liquid drops on a solid surface by molecular-dynamics simulations of coexisting three-phase Lennard-Jones systems of liquid, vapor, and solid. We consider both spherically symmetric atoms and diatomic molecules, and a range of interaction strengths. As the attraction between liquid and…