Materials Literature
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A simplified model of a small one- and three-phase transformer for simulation of the space-distribution of the leakage field outside the magnetic core is presented. The transformer windings with rectangular cross-section are enclosed in a parallelepiped area of calculation. The authors use the finite difference method…
In order to discuss the long-term reliability and safety of zirconium-cobalt (ZrCo) alloy for tritium (T) use, the release behavior of decay helium (3He) from ZrCo tritide has been investigated for one and a half years with a radio-gaschromatograph. The results show that the release fractions of the total decay 3He in…
Abstract The treatment of [(tpp)FeIIICl] [tpp = tetraphenylporphyrin dianion] with NaBH4 in the presence of alkenes afforded σ-type organoiron(III) porphyrins, the structure of which was analyzed by paramagnetic 1H NMR. While 1-alkenes were hydrometallated to give σ-(1-methylalkyl)FeIII(tpp) along with a small amount…
The authors present a method which resolves the three-dimensional eddy current field into a 3-D time harmonic field external to the windings and n axisymmetric eddy current fields near the coils as an approximation for engineering applications. Because the isoparametric FEM (finite element method) with 3-D vector pote…
Abstract Four methods of extracting clays from calcite-rich samples were compared: (i) sodium acetate buffer solution; (ii) lithium acetate buffer solution; (iii) hydrochloric acid; (iv) liquid cation-exchange acid. The methods were tested on mixtures consisting of 80% calcite, 10% quartz and 10% hectorite. Potassium…
The interaction of hydrogen isotopes with MANET (MArtensitic for NET) has been studied by a gas-evolution method in the framework of activities aimed at characterizing this steel. Temperatures in the range 573 – 873 K and loading pressures between 103 and 105 Pa have been used. In the temperature and loading pressure…
The sorption and desorption of tritiated water on paints, such as acryl, silicone, epoxy and fluorine types, has been studied. In dynamic adsorption and desorption experiments, tritium concentration in the chamber, in which painted metal was installed, was measured during HTO vapor charging or purging by N2+H2O. Slow…
This paper describes the engineering, construction and installation of the Exhaust Detritiation System for the JET Active Gas (Tritium) Handling Plant. Commissioning results without tritium indicated that the system has met the design requirements and operating parameters. Hydrogen and methane were fully oxidized. Dew…
Abstract The cellulose derivatives ethyl cellulose and ethyl‐hydroxyethyl cellulose (EHEC) have been studied by XPS in the form of solvent‐cast films. All the films, as well as a sample of cellulose used as a standard material, show significant surface degradation on irradiation in the time period consistent with XPS…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA fluxional binuclear nickel(I) complex and evidence for reversible A-frame formationLjubica Manojlovic-Muir, Kenneth W. Muir, William M. Davis, Hameed A. Mirza, and Richard J. PuddephattCite this: Inorg. Chem. 1992, 31, 5, 904–909Publication Date (Print):March 1, 1992Public…
Abstract Monovanadium derivatives of 12-molybdosulfate(VI) and 18-molybdodisulfate(VI), [S(VMo11)O40]3− and [S2(VMo17)O62]5−, have been prepared as tetrabutylammonium (n-Bu4N+) salts from a Mo(VI)–V(V)–H2SO4–CH3CN system. Both mixed molybdosulfate(VI) comlexes were characterized by their IR and UV spectra and their vo…
Thermal desorption spectroscopy was used to study an outgassing from silanol‐based spin‐on‐glass films with phosphorus doping, cured at a temperature range between 200 and 400°C. Primary desorption products were found to be water and ethylene. Thermal desorption studies using a ramped heating revealed distinct desorpt…
Surface-stabilized ferroelectric liquid crystals (SSFLC) with high-pretilt (about 15°) aligning film showed three types of states (C1U, C1T and C2) with different optical properties. The transmitted light of these states was calculated using the 4×4 matrix method, and the optical memory angle and transmission spectra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of ring-opening reactions of epoxide with aluminum and zinc porphyrins. Relation to the mechanism of ring-opening polymerizationYoshihiko Watanabe, Tomokazu Yasuda, Takuzo Aida, and Shohei InoueCite this: Macromolecules 1992, 25, 5, 1396–1400Publication Date…
Abstract The new mineral tooeleite occurs with pyrite, arsenopyrite, scorodite, and jarosite at the U.S. Mine, Tooele Country, Utah. Analysis by electron microprobe gave Fe 2 O 3 43.56%, As 2 O 5 38.61%, SO 3 7.24%, and H 2 O by the Penfield method 9.80%. For this analysis, the suggested formula is Fe 8-2 x 3+ [(AS 1-…
The author considers the computation of the electromagnetic axial forces on the windings of a step-up-generator transformer under unbalanced MMFs of the same phase by means of a finite element code. The unbalance between the MMFs of the same phase, which might be on the order of the nominal MMF, is caused by the high…
The improved T- Omega method is employed to calculate the three-dimensional transient eddy current field in large transformers, as well as the short-circuit electromagnetic forces acting on the transformer windings. The effects of the magnetic shielding and initial angles of currents are studied, and the nonuniform di…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman spectroscopic studies of intercalated molybdate ions in layered metal hydroxidesJen Twu and Prabir K. DuttaCite this: Chem. Mater. 1992, 4, 2, 398–401Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published inissue 1 March 1992https…
Abstract Photochromic behaviors of hemithioindigo (HT) derivatives in bilayer membrane matrices and related aqueous system are investigated. HT derivatives were incorporated into bilayer membrane matrices at a molar ratio to bilayer amphiphiles of 0.01. Under these conditions, HT amphiphiles having an ammonio group di…
A prototype hydride storage bed was fitted with strain gages to measure strains occurring in the stainless steel bed vessel caused by expansion of the storage powder upon uptake of hydrogen. The strain remained low in the bed as hydrogen was added, up to a bed loading of about 0.5 hydrogen to metal atom ratio. The str…