Materials Literature
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Article Structural and chemical varieties of dioptase, Cu6[Si6O18]∙6H2O was published on August 1, 1989 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 187, issue 1-4).
Abstract This paper is concerned with the study of the positive photosensitive polyimide precursors, and deals with monomer synthesis, polymerization, and characterization. The polymers were prepared from diamines and diaeid chlorides whieh were derived from the reactant with biphenyltetracarboxilic dianhydride and o‐…
Abstract A series of novel ABA block copolymers were synthesized containing a rigid‐rod (B) block for reinforcement and a flexible coil (A) block as the matrix. Poly[(benzo[1, 2d: 4, 5d′]bisthiazole‐2,6‐diyl)‐1,4‐phenylene] (PBT) was the rigid‐rod (B) block utilized in this study and was polymerized in such a way as t…
The present study was undertaken to determine if uses of exogenous electrical fields could improve the posttraumatic quality of dermis and epidermis in isolated grafts in the rat. In blinded procedures, a full-thickness area of skin was removed and reattached to the original site. A galvanic device delivering 4.5 micr…
Mechanical and dielectric strength distributions were studied for variously surface‐finished TiO 2 ceramics. Roughly finished specimens showed a small Weibull modulus for both kinds of failures, and clear analogies between mechanical and dielectric strength distributions were found in both rough‐and fine‐surface speci…
Voids frequently form on crystallization of calcium phosphate glasses because of the density difference between the original glass and the resulting glass‐ceramic. However, the calcium phosphate glass‐ceramic with a composition of 40CaO · 50P 2 O 5 · 10Al 2 O 3 (mol%) has a density nearly equal to that of the original…
Abstract Hochlegierte austenitische Stähle mit 6 bis 7% Molybdän, 20 bis 21% Chrom und 18 bis 25% Nickel finden zunehmend Anwendung im Seewasser‐ und Chemiebereich, vor allem infolge ihrer Beständigkeit gegenüber Loch‐ und Spaltkorrosion in chloridhaltigen neutralen und sauren Medien. Die hohen Chrom‐ und Molybdängeha…
The effect of surface plasmon generation on the reflectivity of thin metal films in attenuated-total-reflection prism configurations has been described as a means of determining the film dielectric function and thickness. Although this technique is capable of yielding accurate values for the film parameters with relat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of porphyrin reduction and decomposition in a high-pressure chemical ionization plasmaGary J. Van Berkel, Gary L. Glish, Scott A. McLuckey, and Albert A. TuinmanCite this: J. Am. Chem. Soc. 1989, 111, 16, 6027–6035Publication Date (Print):August 1, 1989Publication…
We developed a two-target rf-magnetron sputtering system to reproducibly fabricate bright ZnS:TbOF thin-film green electroluminescent panels. ZnS and Tb are sputtered from independent targets, and the substrate moves between these targets. This results in good controllability of both ZnS thickness and Tb doping concen…
Ninety compounds, over seventy of which are members of a number of homologous series of three-ring esters containing a 5-membered heteroaromatic ring, have been synthesized in order to establishhow a change in the position of the heterocyclic ring influences liquid crystal behavior when comparedwith corresponding all-…
Abstract The photochemistry of an appropriately substituted bisimide has been studied in solution by conventional means and time resolved laser techniques as a model for the behavior of inherently photosensitive solvent soluble polyimides, whose photochemistry are not well understood. A mechanism for the photochemical…
Nuclear reaction analysis and ion implantation techniques were used to investigate the trapping of deuterium (D) by He bubbles and implantation defects in Ta. A series of four complementary temperature ramp experiments have enabled us to determine that: (1) the binding enthalpy of D at trap sites associated with He bu…
The geometric theory of imaging for spectrometer systems is extended to include those with diffraction gratings produced holographically by the intersection of two sets of spherical wave fronts that have been rendered aspheric through reflection from concave mirrors. Aberration coefficients are derived that reduce to…
Etude par spectroscopie Raman et diffraction RX. Observation d'un pic Raman a 506 cm −1 specifique d'un cycle comportant quatre tetraedres silicate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEfficient syntheses of dioxorhenium(V) complexesJohn C. Brewer and Harry B. GrayCite this: Inorg. Chem. 1989, 28, 17, 3334–3336Publication Date (Print):August 1, 1989Publication History Published online1 May 2002Published inissue 1 August 1989https://pubs.acs.org/doi/10.1021…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin density in the heterodinuclear compound Cu(salen)Ni(hfa)2: a polarized neutron diffraction studyBeatrice Gillon, Christian Cavata, Peter Schweiss, Yves Journaux, Olivier Kahn, and Daniel SchneiderCite this: J. Am. Chem. Soc. 1989, 111, 18, 7124–7132Publication Date (Pri…
Abstract Adsorption of p -hydroxybenzoate anion on synthetic Fe oxides, hydroxides, and oxyhydroxides (hereafter referred to as oxides) was measured at pH 5.5, and the organic-oxide interaction was characterized using diffuse-reflectance Fourier-transform infrared (DRIFT) spectroscopy. Surface complexes with ferrihydr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn evaluation of the substrate specificity, and of its modification by site-directed mutagenesis, of the cloned L-lactate dehydrogenase from Bacillus stearothermophilusMarcel A. Luyten, Daniel Bur, Hla Wynn, Wendy Parris, Marvin Gold, James D. Friesen, and J. Bryan JonesCite…
Abstract Triclinic II b -4 and monoclinic II b -2 clinochlore polytypes from Kenya are intergrown laterally in (001) platelets and are separated optically in some places by sharp lines of demarcation and in other places by embayed boundaries. Electron microprobe analyses show no compositional differences between the t…