Materials Literature
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The outlines of a comprehensive study on crystallization of polyethylene under elevated pressure (P) are being reported. Through in situ viewing of formation and growth of the lamellar crystals, complemented by x-ray diffraction information, it could be established that within the range of experiments (P = 1.8–5.5 kba…
A single histidine residue has been placed at either the N-terminus or the C-terminus of each of the two alpha-helices of barnase. The pKa of that histidine residue in each of the four mutants has been determined by 1H NMR. The pKas of the two residues at the C-terminus are, on average, 0.5 unit higher, and those of t…
BACKGROUND: Gene transfer into the arterial wall may provide a novel therapeutic strategy for the treatment of coronary artery restenosis. Previously described methods for gene transfer into the arterial wall require total vessel occlusion for 30 minutes. We sought to develop a protocol for gene transfer within a more…
The pretilt angles generated in nematic liquid crystal (5CB) media that are disposed in sandwich type cells and oriented by using various orientation films are shown to depend both on the nature of the orientation films and the rubbing strengths in the following way: first, in a cell with alkyl branched polyimide (PI…
The hydrolysis of uranium oxycarbide (UCO) was studied by injecting water vapor into a fuel element containing a known number of high‐temperature, gas‐cooled reactor (HTGR) coated particles with exposed fuel kernels. The experiments were conducted in the High Flux Isotope Reactor (HFIR) at temperatures between 700° an…
The volatilities of simulated, high‐level nuclear waste glasses have been measured using thermogravimetric analysis (TGA). These volatilities were measured in the region of the glass transition temperature ( T g ) of the waste glasses, which is between 450° and 500°C. These data were obtained because the Waste Accepta…
Abstract Soils derived from granite rocks occupy 66% of the land in Korea. Two soils from the southern part of Korea formed on metamorphosed granite under forest vegetation, containing high amounts of ferruginous chlorite, were studied to evaluate weathering and formation of clay minerals. The soils are deeply weather…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of the silicon(111) (.sqroot.3 .times. .sqroot.3)R30.degree.-boron surface reconstruction by simulated annealingYat Ting Wong, Boris Schubert, and Roald HoffmannCite this: J. Am. Chem. Soc. 1992, 114, 7, 2367–2371Publication Date (Print):March 1, 1992Publicatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConcentrated emulsions. 2. Effect of the interdroplet film thickness on droplet size and distortion in mono- and bidisperse face centered cubic packingsDoble Mukesh, Ashok K. Das, and Pushpito K. GhoshCite this: Langmuir 1992, 8, 3, 807–814Publication Date (Print):March 1, 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransient responses of natural convection heat transfer with liquid gallium under an external magnetic field in either the x, y, or z directionKazuto Okada and Hiroyuki OzoeCite this: Ind. Eng. Chem. Res. 1992, 31, 3, 700–706Publication Date (Print):March 1, 1992Publication…
Abstract A range of bismaleimide resins of differing network structure was produced both by varying the ratios of N,N′‐bismaleimido‐4,4′‐diphenylmethane (BMI) and methylene dianiline (MDA), and also by the use of different thermal processing cycles. Characterization of the resins by a variety of mechanical, physical,…
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…