Materials Literature
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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…
ABSTRACT Polypropylene and polyethylene terephthalate films were immersed in pure triglycerides or fatty acids for a range of times. They were analyzed for the amount sorbed to determine the relative importance of fat chemical configuration and cohesive energy density (CED) on sorption order and amount. Structure affe…
In this paper, the author describes how effects related to dislocation mobility can be incorporated in the instability criterion in a straightforward manner and used to analyze the strain-rate dependence of (Tc). He begins with a simple example and studies the dynamics of a group of dislocations in the vicinity of a c…
Abstract Kinetics of manganese(III) oxidation of L‐arginine has been studied in the presence of pyrophosphate and acetate ions in acidic media at 328 K and 323 K, respectively. The nature of the oxidizing species formed in manganese(III) solutions was determined by spectrophotometric and redox potential measurements.…
In the present paper we address the question of whether localized failure due to elastoplastic bifurcation can be captured within the fixed‐mesh approach. To this end, the theoretical framework of localization analysis of elastoplastic solids is revisited, and examples of weak discontinuities are presented for an elas…
Author: Kang, C. S. et al.; Genre: Journal Article; Issued: 1994; Title: SYNTHESIS AND PROPERTIES OF AROMATIC MAIN-CHAIN POLYESTERS HAVING<br/> DISPERSE RED-1 NONLINEAR-OPTICAL CHROMOPHORES IN THE SIDE-CHAIN
Abstract The kinetics of the H 2 O 2 decomposition by Cu(II)‐, Co(II)‐, and Fe(III)‐amine complexes supported on the surface of silica‐alumina (25% Al 2 O 3 ) catalyst have been investigated. The decomposition process proceeded with first‐order kinetics for the substrate concentration. With copper complexes, in partic…