Materials Literature
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The effect of alternating oxic and anoxic conditions (12 h oxic‐12 h anoxie) on sulfate reducing activity, iron‐sulfur chemistry and the corrosion of mild steel, has been studied in biofilm reactors. During the experiment (35 d) an increasing activity of sulfate reducing bacteria was observed. A part of the produced s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(p-phenylene sulfone)Douglas R. Robello, Abraham Ulman, and Edward J. UrankarCite this: Macromolecules 1993, 26, 25, 6718–6721Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published inissue 1 December 1993https://pubs.acs.org/doi/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of polyphosphazene block copolymers bearing alkoxyethoxy and trifluoroethoxy groupsKrzysztof Matyjaszewski, Mary K. Moore, and Michael L. WhiteCite this: Macromolecules 1993, 26, 25, 6741–6748Publication Date (Print):December 1, 1993Publication History Published on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of poly(1-aminonaphthalene) and poly(1-aminoanthracene) by chemical oxidative polymerization and characterization of the polymersDoo Kyung Moon, Kohtaro Osakada, Tsukasa Maruyama, Kenji Kubota, and Takakazu YamamotoCite this: Macromolecules 1993, 26, 25, 6992–6997P…
We report the simulation of the optical absorption and emission spectra of the ${\mathrm{Eu}}^{3+}$ ion doped in a sodium disilicate glass. A model of this glass was previously simulated by the molecular-dynamics technique. We employ a full treatment, including J mixing, of the point-charge crystal-field method develo…
The structure of the P2(1) crystal form of adenylosuccinate synthetase from Escherichia coli has been determined to a resolution of 2.8 A. The refined model for the enzyme gives an R factor of 0.20 and a root-mean-square deviation from expected bond lengths and angles of 0.016 A and 2.27 degrees, respectively. The dom…
The influence of rare‐earth additives, such as La, Nd, Sm, and Gd, and poling conditions on the electromechanical properties of (Pb 1−3 x /2 Ln x )(Ti 0.98 Mn 0.02 )O 3 compositions, x = 0.04–0.12, were investigated. The type and amount of additive were found to affect the lattice anisotropy, dielectric constant, and…
The relationship between micrograin structures and electrical characteristics of sputtered indium tin oxide (ITO) films was investigated. Micrograin structures were observed by a high resolution scanning electron microscope. Electrical characteristics were evaluated by four point probe resistance measurement and Hall…
Of the various types of synthetic metals , intrinsically conducting polymers (once discovered) quickly became te materials most frequently studied, owing to their properties, structural variability, and great potential for commercial applications. This month's essay traces the progress made in their investigation duri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneralizing the metallacrown analogy: ligand variation and solution stability of the VVO 9-metallacrown-3 structure typeBrian R. Gibney, Ann J. Stemmler, Steffen Pilotek, Jeff W. Kampf, and Vincent L. PecoraroCite this: Inorg. Chem. 1993, 32, 26, 6008–6015Publication Date (…
Platinum and ruthenium oxide (RuO2) deposited by ion beam sputter-deposition are evaluated for use as electrodes for PZT thin film capacitors. The effect of deposition temperature, film thickness, and the presence of oxygen on hillock formation in platinum is discussed. It is shown that the hillock density in Pt/Ti/Si…
We derive Green–Kubo (GK) relations for the viscosity coefficients of nematic liquid crystals. These GK relations are similar to, but considerably more complicated than, those of an isotropic fluid. In addition to shear viscosities there are also twist viscosities and cross couplings between the symmetric strain rate…
Rat liver mitochondrial fatty acid oxidation multienzyme complex consists of 4 mol of the alpha-subunit and 4 mol of the beta-subunit, and has three enzyme activities of long chain enoyl-CoA hydratase, long chain 3-hydroxyacyl-CoA dehydrogenase, and long chain 3-ketoacyl-CoA thiolase. The following cDNA clones for the…
Abstract The connection of symmetry groups, their irreducible and band representations for the models of finite and infinite crystals is considered in detail. The relation between localized (electronic and vibrational) states of finite and infinite crystals is studied on models. It is found that the Wannier states of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTN,N'-Bis(p-ethynylphenyl)pyromellitimide: a new processable, high-Tg rigid rod heat-resistant polymer precursor with no polymerization shrinkageAnastasios Melissaris and Morton H. LittCite this: Macromolecules 1993, 26, 25, 6734–6740Publication Date (Print):December 1, 1993P…
Abstract In this study, the effect of the particle size of solid protective agent, commercially obtained and in‐situ formed tricalcium phosphate (TCP), on the particle size of suspension polymerized polystyrene (PS) is investigated. It is concluded that when a solid protective agent like TCP is used, its particle size…
Abstract Watanabeite Cu 4 (As,Sb) 2 S 5 , in which As>Sb, is a new copper sulphosalt that occurs with quartz in a hydrothermal vein at the Teine mine, Sapporo, Hokkaido, Japan. It is silvery lead-grey in colour with lead-grey streak. VHN 100 = 253-306 kg/mm 2 , brittle. It has no cleavage and the fracture is uneven…
The 4f-4f transitions absorb electric dipoles, magnetic dipoles, or even higher electrical multiple radiations. These electric dipole transitions in the 4fn configuration are parity forbidden, however, as a result of the interaction of the central lanthanoid ion and surrounding ligands mixing into a 4fn con- figuratio…
Abstract In computer modeling of air guns the theory is often based on the assumption of an ideal freely oscillating spherical air bubble in an ideal fluid. Theoretical and experimental air-gun signatures do not match perfectly. Synthetic signatures are underdamped compared to real signatures. Several physical effects…
A nanocrystal structure and non-equilibrium solid solution of Fe-20 at.% Cu has been obtained after severe plastic deformation and additional heating. Thin disc samples were pressed at up to 11 GPa between Bridgman anvils and then deformed by rotating one anvil about the other. Cu does not normally form a solid soluti…