Materials Literature
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Presently the only valid species of Pseudohimantidium is P. pacificum, described by Hustedt & Krasske, from the northern marine Chilean water masses. Frustule morphology and its variability were studied by means of light and electron microscopy, both transmission and scanning. Among the least stable characteristics th…
Abstract Adhesion loss caused by salt corrosion is proposed to occur by the following process: 1) During a salt corrosion test, the NaCl solution rises in the cavity located at the steel-cord center. 2) An electrochemical oxygen concentration cell is formed. 3) OH − is produced by the reduction of oxygen. 4) An increa…
The general and localized corrosion performance of AISI 303 stainless steel (SS) has been investigated. The material was either in its conventional form or produced from rapidly solidified powder. The rapidly solidified alloy exhibited markedly improved general corrosion resistance compared to the conventional alloy o…
The electron attachment rate constants of SO2 and CS2 in the buffer gases of Ar, N2, and CH4 (150 to 530 Torr) at various E/N (1–16 Td) were measured by a parallel-plate drift-tube electron-swarm technique. The electrons were produced by irradiating the cathode with KrF laser photons. For the SO2–Ar mixture, the elect…
Kinetics and mechanism of formation of urethane, biuret, allo-phanate, and isocyanurate in the synthesis of polyurethanes were studied by means of 13C-NMR and GPC. In the spectra, the regions of urethane, allophanate, biuret, and isocyanurate were used to study the mechanism of reaction between isocyanates and glycols…
The effect of the addition of a buffer to an ethylenediaminetetracetic acid (EDTA) litholytic solution on the solubility of calcium oxalate monohydrate and hydroxyapatite is investigated. The experiments show that the addition of triethanolamine as a buffer to EDTA solutions at pH 8 and 8.5 enhances the solubility of…
The London-limit penetration depth, ${\ensuremath{\lambda}}_{L}$(T), has now been calculated as a function of temperature, T, for ${\mathrm{V}}_{3}$Si using two recent tunneling-derived spectra of the electron-phonon interaction. Significantly different predictions for ${\ensuremath{\lambda}}_{L}$(T)/${\ensuremath{\la…
Izoklakeite from Vena, Swede:r occurs in aggregates up to a few mm in diameter, intergrown with jask6lskiite, native bismuth, galena, pyrrhotite and, rarely, native antimony. The average of 19 electron-microprobe analyses is Pb 50.01, Bi 19.20, Sb 11.67, Cu 0.88, Ag 0.59, Fe 0.19, S 16.91. sum 99,45 wtVo. Based on 96…
The main current-generating corrosion cells in the oral cavity are the bimetallic cell and the concentration cell, the latter mainly occurring due to differences in access to oxygen in the various parts of the metallic material. Corrosion resistance is not an intrinsic property of a metal or an alloy for it depends on…
ABSTRACT The abdominal muscle tissues of giant river prawn, fleshy prawn and spiny lobster contained 2.4–2.6% collagen of the total tissue protein. Alkali‐insoluble proteins were prepared from the muscle tissues by treatment with 0. 1N NaOH at 4°C and found to exhibit the amino acid composition typical of collagen. Th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of phosphazenes. 28. Reactions of pentachloro- and pentafluoro(triphenylphosphazenyl)cyclotriphosphazenes with sodium methoxide. Mechanistic aspects and their implications for nucleophilic displacement at a tetrahedral phosphorus(V) centerK. C. Kumara Swamy and S. S.…
Photon absorptiometric measurements of several elements, mixtures and substances of biomedical interest have been performed. The 144.5 keV photons of 141Ce and the associated x-ray emissions of 203Hg at 75 keV and 137Cs at 33 keV in addition to the more commonly applied energies of 279.2 and 661.6 keV respectively, ha…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structures of dinuclear nickel(I) di-tert-butylarsenido complexes: x-ray crystal structures of [Ni(.mu.-tert-Bu2As)(PMe3)]2 (Ni-Ni) and [Ni(.mu.-tert-Bu2As)(CN-p-tol)2]2 (Ni-Ni) (tol = tolyl)Richard A. Jones and Bruce R. WhittleseyCite this: Inorg. Chem. 1986,…
Textile materials deteriorate, during their useful life, by being subjected to the effects of many degradative mechanisms. Sunlight, weathering, laundering or dry-cleaning treatments, abrasion, perspiration, and other such unavoidable sources of fibre damage all exert their toll on physical or chemical properties to c…
The planning of an optical monitoring process for nonquarterwave stacks, using standard equipment for turning value monitoring, is a rather complicated procedure. It is shown that by using a computer program together with some simple rules the planning becomes a more straightforward task. Detailed examples are present…
A new method was developed inducing antithrombogenicity to biologic materials. A basic protein, protamine, was used to increase heparin binding to collagenous materials. Protamine sulfate solution was poured into a collagen-rich material (porcine ureter). The protamine adsorbed to the collagen was then cross-linked to…
The breakdown of passivity of iron in alkaline sulfide solution is a two‐step process. The first step involves the nucleation of mackinawite patches at faults in the oxide film and their subsequent growth by dissolution of the oxide. The second step is associated with the growth of pits under these patches. At higher…
Colloidal gold labeling in conjunction with silver enhancement was investigated as a labeling technique for photoelectron microscopy (PEM). PEM uses UV-stimulated electron emission to image uncoated cell surfaces, and markers for cell surfaces need to be sufficiently photoemissive to be clearly visible against this ba…
The electronic absorption spectrum, electronic Raman spectrum of Cs2NaPrCl6, luminescence spectrum of Cs2NaPrCl6 and Cs2NaYCl6: PrCl6 3-, and the excitation spectrum of Cs2NaYCl6: PrCl6 3- have been studied between room and liquid helium temperatures. Twenty-four transitions from the (3 H 4)Γ1 electronic ground state…