Materials Literature
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The “supercell” scheme is applied to the study of local defects in MgO (Ca substitution, cation and anion vacancies) and bulk silicon (carbon substitution). The trend of the quantities of interest (defect formation energy, geometrical relaxation, charge distribution around the defect) as a function of the supercell si…
The magnetoelectricity of the boracite Cr3B7O13Cl has been studied by quasistatic and dynamic magnetoelectric (ME) H measurements on (001)cub platelets with a ferroelastic/ferroelectric single domain state, obtained by poling with an electric field of E = 45 kV·cm−1, applied upon cooling through the 42ml′ ⇒ mm21′ phas…
The plasticizer, n-butylbenzenesulfonamide (NBBS), is reported to be neurotoxic when inoculated intracisternally or intraperitoneally into rabbits. Because NBBS is commonly used in the production of polyamide (nylon) plastics and is soluble in water, the disposal of NBBS-containing plastics in landfill sites could res…
The diffusion of oxygen in commercially available aluminum nitride substrates has been studied by performing interdiffusion‐type experiments. The diffusion of oxygen both within AlN grains and along grain boundaries was investigated. By using as‐received AlN substrates and an electron microprobe as an analytical tool,…
Abstract An alcohol utilizing Alcaligenes eutrophus NCIMB 12080 produced a copolymer, poly‐(hydroxybutyrate–valerate) (PHBV), in a computer‐controlled 7‐L fed‐batch fermentor when the alcohol feed contained pentanol. Pentanol as a sole carbon source was not efficient either for cell growth or for PHBV production. To a…
Our previous work has demonstrated a relationship between polarity index and organic carbon referenced partition coefficients (K oc ) of organic chemicals. Here we compare sorption of benzene, toluene, or o-xylene by protein with non-protein organic sorbents. K oc for benzene, toluene, or o-xylene sorption by collagen…
A thermogravimetric study of the oxygen activity dependent variation of the oxygen content in CaO-doped zirconia has been performed at different dopant concentrations within the stability limit of the tetragonal solid solution at temperatures between 1200 and 1300°C. The experimental results are compatible with a simp…
A transfer-matrix method is used to study cylindrical-wave reflection at cylindrical media interfaces. We find that the reflection can be total at an interface of small radius but is only partial if the radius is large. This feature is useful for designing optical sources and receivers of small radii. Cylindrical-wave…
Abstract The fabrication and electrochemical characterization of a variety of self‐supported thermorevrsible organic electrolyte gels prepared using l,3:2,4‐dibenzylidene sorbitol (DBS) as a gelling agent are reported. Impedance analysis and cyclic voltammetry were used to examine these gel systems, which exhibit ioni…
Abstract New dilactone-type fluorescent dyes have been synthesized starting from 1,4-naphthoquinone and m-(dialkylamino)phenols. Both the fluorescence maxima and intensities of the dyes were drastically changed depending on solvent polarity. The dyes also showed good fluorescent dichroic properties in an ordered nemat…
The real and imaginary parts of the refractive index have been obtained in a wide energy range (0.5-12 eV) for films (0.2-0.3 µm thick) of amorphous carbon with different hydrogen contents (0-40 at. %) to obtain more insight into the electronic structure of these materials. Reflectance and transmittance measurements h…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRetinoids and Related Compounds. 17. Conformational Study of Retinochrome Chromophore: Synthesis of 8,18-Ethanoretinal and a New Retinochrome AnalogAkimori Wada, Miho Sakai, Tomoya Kinumi, Kazuo Tsujimoto, Masashige Yamauchi, and Masayoshi ItoCite this: J. Org. Chem. 1994, 5…
The potential for surface engineering solutions to increase the corrosion and wear resistance of diesel valves is examined with regard to operation in residual fuel oil combustion products. The environment in which the exhaust valve operates is discussed. The corrosion test is used to sort the 27 coating treatments an…
Abstract Block polymerization of glycolide (GA) and ϵ‐caprolactone (ϵ‐CL) has been initiated with aluminum alkoxides, such as Al(O i Pr) 3 and Et 2 AlOCH 2 X (where X = ‐CH 2 ‐Br and ‐CH 2 O‐C(O)‐C(Me)=CH 2 ), in THF at 40°C. Structure and composition of block copolyesters have been characterized with respect to the m…
The interaction of hydrogen with a chemical vapor deposition (CVD) deposited polycrystalline film on Si(100), cleaned by heating to 1500 K, has been examined. No adsorption is observed unless prior activation with a hot filament is carried out. However atomic H thereby created is found to adsorb with a high sticking p…
Abstract The mercury perrhenates with the empirical formulas HgReO 4 and Hg 2 ReO 5 were prepared by annealing powdered mixtures of mercury(II)oxide and mercury(II)metaperrhenate Hg(ReO 4 ) 2 in sealed silica tubes. Their crystal structures were determined from single‐crystal X‐ray data. HgReO 4 crystallizes dimeric w…
The optical absorption, luminescence, luminescence excitation, and luminescence decay kinetics of a dopant with a 3${\mathit{d}}^{3}$ shell (most probably ${\mathrm{Cr}}^{3+}$) and ${\mathrm{V}}^{3+}$ ions in natural ${\mathrm{Ca}}_{2}$${\mathrm{Al}}_{3}$${\mathrm{Si}}_{3}$${\mathrm{O}}_{12}$(OH) zoisite crystal have…
We attempt to establish the mathematical expression of the current and the magnetic field in a metallized capacitor. The expression of the impedance of this capacitor is also presented. The distribution of the current is discussed through the variation of the capacitor impedance and compared to experimental ones. Ther…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetalorganic Chemical Vapor Deposition of Lead TitanateWarren C. Hendricks, Seshu B. Desu, and Chien H. PengCite this: Chem. Mater. 1994, 6, 11, 1955–1960Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue 1 November 1994h…
The morphology, systematics and ecology of a new centric diatom, Cyclotella pseudocomensis nov. sp., are presented. The morphological variation and ultrastructure from initial to the smallest cells are described as revealed by light and scanning electron microscopy. This new species is characterized by the transverse…