Materials Literature
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Measurements of dc electrical conductivity and emf of single crystal and polycrystalline α‐Al 2 O 3 doped, respectively, with 100 and 300 ppm yttrium show that yttrium, although isoelectronic with aluminum, is a donor. The electronic energy level of the donor is attributed to O 2‐ next to Y 3+ , its level being forced…
Abstract A polytype of InSe single crystals is determined to be of γ‐type by means of X‐ray Laue and diffractometer measurements. Polarized Raman scattering studies are carried out at room temperature and the spectra are analysed by using the normal modes of γ‐InSe. Two Raman lines of the A 1 mode (118, 228 cm −1 ) an…
Abstract Different montmorillonites (Otay, Chambers, Marnia, Camp Berteau, Moosburg, Greek White, Wyoming bentonite were deferrated with a dithionite/citrate solution; iron sulphide by-products were eliminated with an HCl washing and citrates with an H 2 O 2 oxidation. The smaller CEC after deferration could not be as…
Abstract The Upper Pliocene sediments near Lebrija in southern Spain contain commercial deposits of palygorskite and sepiolite. These sediments of continental origin consist chiefly of carbonate, marl, and clay resting on marine Pliocene quartzose sand. The lowest unit, the “Marly-Calcareous Bed,” consists of sepiolit…
Cyclopropanone hydrate irreversibly inactivates horseradish peroxidase in a time-dependent manner in the presence of oxidizing agent, hydrogen peroxide. The inhibition reaction is a second order reaction of cyclopropanone hydrate with compound I, the 2 electron-oxidized form of peroxidase, and results in covalent modi…
Magnetic susceptibilities and magnetization isotherms have been measured for single crystal FeTiO 3 . The susceptibility parallcl to the c -axis has a large and sharp peak at T N =58.0±0.3 K, while the perpendicular susceptibility is almost independent of temperature below T N . Magnetization isotherm at 4.2 K with fi…
Corrosion and fission product release from silicon carbide (SiC)-coated high-temperature gas-cooled reactor fuel particles represent a serious problem. The SiC corrosion by fission product palladium has been observed. The current results show that temperature is the major factor affecting the corrosion rate of SiC by…
A new criterion of phase separation of segmented polyurethaneureas. is found by comparing the relative crystallinity of the soft segment of polyurethaneurea. This criterion is more sensitive than the conventional thermal transition temperature measurements. The difference of crystallinity can be distinguished even if…
The nature of the deformation process involved in hot drawing of porous high-molecular-weight polyethylene was examined by apparent elongational viscosity measurements at drawing temperatures between 100°C and 150°C and deformation rates in the range of 10−6–10−3 m/s. The temperature dependence of the apparent elongat…
Growth of various species of macro-algae and diatoms was measured in culture in a range of concentrations of germanium dioxide. Growth of Laminaria saccharina was inhibited measurably at concentrations above 0.22 mg GeO2 l−1 and very markedly inhibited above 1.1 mg GeO2 l−1. Fucus spiralis was measurably inhibited at…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMoessbauer effect and magnetic investigation of the S = 3/2 .tautm. S = 1/2 spin crossover in [Fe(salen)NO] and the S = 3/2 state in [Fe(5-salen)NO]F. V. Wells, S. W. McCann, H. H. Wickman, S. L. Kessel, D. N. Hendrickson, and R. D. FelthamCite this: Inorg. Chem. 1982, 21, 6…
Starting from a consideration of how the phonon frequency would change with the spin splitting of the conduction-electron energy bands in an itinerant-electron ferromagnet, we find that in the paramagnetic region the effect of the electron-phonon interaction makes the temperature dependence of the spin susceptibility…
ABSTRACT Reproduction in Rhoicosphenia curvata (Kütz.) Grun. is isogamous. The two auxospores formed expand parallel to the apical axes of the gametangial cells. Expansion is bipolar and leads to the formation of a slightly curved, tapering cell, in which the initial valves are laid down. The perizonium consists of tr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotophysics of aqueous tetracyanoplatinate(2-)John W. Schindler, Robert C. Fukuda, and Arthur W. AdamsonCite this: J. Am. Chem. Soc. 1982, 104, 13, 3596–3600Publication Date (Print):June 1, 1982Publication History Published online1 May 2002Published inissue 1 June 1982https…
This report reviews the possible effects of both radiation damage to the glass and of radiolysis of the leachant on the leaching behaviour of vitrified radioactive waste. It has been stimulated particularly by recent papers, which have suggested that the leach rates of glasses will be enhanced by large factors after a…
Abstract Die Aktivkorrosion von nichtrostendem Chrom‐Nickel‐Stahl X 5 CrNi 18 9 (Werkstoff Nr. 1.4301) in Schwefelsäure wird durch Schwefeldioxid sowie Schwefelwasserstoff stimuliert (Erweiterung des Potentialbereichs der Aktivkorrosion, Erhöhung der maximalen Korrosionsgeschwindigkeit im Aktivzustand und Erhöhung der…
Abstract The reaction of poly(vinyl alcohol) with styrylpyridinium and quinolinium salts which contain formyl group produced water‐soluble photosensitive polymers. The sensitivity was high, although the content of the styryl groups was extraordinarily low. Spectroscopical studies revealed that the high sensitivity is…
The water sorption, bound water, ionic conductivity, and chemical stability of polystyrene sulfonic acid (PSSA), polyethylenesulfonic acid (PESA), poly‐2‐acrylamido‐2‐methylpropanesulfonic acid (poly‐AMPS), and perfluorosulfonic acid (Nafion) have been determined. All the ion‐containing polymers investigated were foun…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical preparation of a Prussian blue analog: iron-ruthenium cyanideKingo Itaya, Tatsuaki Ataka, and Shinobu ToshimaCite this: J. Am. Chem. Soc. 1982, 104, 13, 3751–3752Publication Date (Print):June 1, 1982Publication History Published online1 May 2002Published inis…
Abstract Two random commercial ethylene‐propylene copolymers (EPM) with different ethylene content have been added to binary isotactic polypropylene (iPP)/high density polyethylene (HDPE) blends by melt mixing in a Brabender‐like apparatus. Impact Izod tests and a morphological analysis on the fractured surfaces of br…