Materials Literature
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The photosynthetic pigments of 51 species (71 isolates) of tropical and sub-tropical diatoms from 13 out of 22 families were examined. These were the Thalassiosiraceae, Melosiraceae, Coscinodiscaceae, Rhizosoleniaceae, Biddulphiaceae, Chaetoceraceae, Lithodesmiaceae, Eupodiscaceae, Cymatosiraceae, Diatomaceae, Navicul…
An approximate 3-dimensional analysis to study the effects of a system of transverse and longitudinal matrix cracks in cross-ply laminates is given. The method considers a repeating unit cell containing three subcells in every one of which the displacement vector is expanded to second order. The equilibrium equations,…
The competitive effect of the inorganic anions OH-, Cl-, Br-, I-, ClO-4, NO-3, SO2-4, CO2-3 and phosphates on the behavior of copper in alkaline aqueous solutions at pH 12 was investigated. The nature of changes occurring on the copper surface was analyzed by potentiodynamic and potentiostatic methods in conjunction w…
(1) Proteolytic digests of tissue elastin contain material which reacts with dimethylaminobenzaldehyde in acid solution (Ehrlich's reagent) to give a cherry-pink colour. This Ehrlich chromogen(s) [EC(s)] is similar to but not identical with EC(s) previously demonstrated in tissue collagens [Scott, Hughes & Shuttlewort…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanisms of ring-opening polymerization of 2-(perfluoroalkyl)-2-oxazolines initiated by sulfonates: a novel covalent-type electrophilic polymerizationMasatoshi Miyamoto, Keigo Aoi, and Takeo SaegusaCite this: Macromolecules 1988, 21, 6, 1880–1883Publication Date (Print):Ju…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemistry of vanadyl porphyrins in dimethylformamideKarl M. Kadish, D. Sazou, C. Araullo, Y. M. Liu, A. Saoiabi, M. Ferhat, and R. GuilardCite this: Inorg. Chem. 1988, 27, 13, 2313–2320Publication Date (Print):June 1, 1988Publication History Published online1 May 2002…
Fructose-6-P,2-kinase:fructose-2,6-bisphosphatase has been purified to homogeneity from beef heart. The enzyme was bifunctional and the specific activities of the kinase and the phosphatase of the pure enzyme were 60 and 30 milliunits/mg, respectively. The molecular weight of the enzyme was 118,000, consisting of two…
Abstract Werkstoffe mit herausragenden mechanischen, chemischen, elektrischen und thermischen Eigenschaften sind Gegenstand permanenter Nachfrage in Forschung und Industrie. Für eine wirtschaftliche Anwendung sollten solche Materialien unbegrenzt verfügbar und leicht herstellbar sein, ein geringes spezifisches Gewicht…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActivation of a .beta.-lactone by oxidative addition and the structure of a platina(IV)lactoneKhin Than Aye, Deanna Colpitts, George Ferguson, and Richard J. PuddephattCite this: Organometallics 1988, 7, 6, 1454–1456Publication Date (Print):June 1, 1988Publication History Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature dependence of the crystal lattice modulus and the Young's modulus of polyethyleneMasaru Matsuo and Chie SawatariCite this: Macromolecules 1988, 21, 6, 1653–1658Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Published inissue 1…
Fracture toughness of several different materials was measured using chevronnotched short bar and four‐point bend specimens For glass‐ceramic and ceramic samples both specimens gave valid results. Fracture toughness values measured with bend specimens are 5% to 10% higher compared to those of the short bar. Consistent…
The distribution and some characteristics of grain boundaries have been determined in three samples of fine‐grained Mg‐doped alumina which had undergone different thermo‐mechanical treatments: as‐pressed at 1500°C, stress‐free annealed, and deformed at the same temperature. The analyses of some particular features poi…
The reaction of vanadia films with yttria stabilized single-crystal cubic and polycrystalline cubic-tetragonal zirconias was studied using Rutherford backscattering (RBS) and x-ray diffraction, with some selected depth profiling studies. Vandium on zirconia readily oxidizes at 500 °C to form vanadia films. With increa…
The electrical conductivity of electrochemically reduced samples of stabilized zirconia has been measured by impedance spectroscopy, in the range 500–1000 K. Two different conduction processes are involved depending on the deviation from stoichiometry. For small deviations from stoichiometry, the total electrical cond…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT5-Unsubstituted 2-pyrrolecarboxaldehydes for porphyrin synthesis and the cyanovinyl protecting groupJohn B. Paine III and David DolphinCite this: J. Org. Chem. 1988, 53, 12, 2787–2795Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Published…
The influences of mechanical strain on hydrogen entry and transport are reported for a high strength steel alloy (AISI 4340) under cathodic polarization in aqueous sodium chloride solution. The overall rate of hydrogen permeation and the quantity of hydrogen absorbed are shown to be particularly low in alkaline chlori…
A new apparatus designed specifically for the study of electron scattering from unstable species at very low incident energies has been constructed and put into operation. Remeasurement of the O I ³P → ³S 0 (1304 Å) differential and integral cross sections (DCS and ICS) at energies below 30 eV has provided new values…
A preliminary study was conducted to demonstrate the usefulness of the combined technique of differential scanning calorimetry (DSC) and mechanical testing for the shape memory metals of 54NiTi and 53NiTiCo(3%) alloys. The DSC technique was used to measure precise transformation temperatures and the amount of thermal…
Absorption line shape and spin-lattice relaxation-time measurements have been made on $^{13}\mathrm{C}$ nuclei (1.1% abundant) in a type-IIb single-crystal semiconducting diamond. The line shape measurements are consistent with theoretical predictions for a dilute spin system. Over the temperature range 295--375 K, th…
The total erosion yields of several types of graphites have been measured during high ion flux exposure in the PISCES plasma facility. Hydrogen and deuterium plasmas have been used to bombard Poco, ATJ, pyrolytic, and C-SiC-coated graphites, and a '4-D' C-C composite weave. Erosion experiments with ion fluxes of up to…