Materials Literature
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A drastic drop of the electrical resistivity was observed on a ferroelectric insulator BaTiO 3 surface, after KrFlaser irradiation in air at atmospheric pressure. The temperature dependence of the resistivity was employed to demonstrate semiconducting behavior. Such behavior was seen when the resistance was measured i…
The behavior of melts in severe accident sequences affects the nature (composition and fission product inventory) of the debris released from the vessel upon lower head failure in unmitigated accidents and the coolability of debris at various stages in managed accidents. Core melting progressed further in the Three Mi…
Article Zur chemischen und thermischen Stabilität von Fluortensiden / The Chemical and Thermic Stability of Fluorosurfactants was published on December 1, 1989 in the journal Tenside Surfactants Detergents (volume 26, issue 6).
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUV resonance Raman enhancement of vinyl stretching in ferric protoporphyrin IX: conjugation and preservation of the vinyl .pi. .fwdarw. .pi.* transitionValentino L. DeVito and Sanford A. AsherCite this: J. Am. Chem. Soc. 1989, 111, 26, 9143–9152Publication Date (Print):Decem…
<div class="htmlview paragraph">A Task Force on Corrosion has been established by the Automotive Applications Committee of the American Iron and Steel Institute. The Task Force is composed of technical representatives from the North American sheet steel producers and experts from the major automakers and pretrea…
This study is the first to make a direct comparison between the distorting mirror and the distorting videocamera with the same group of nonclinical subjects. It also establishes the internal consistency, the test-retest reliability and the convergent validity of both techniques. Analysis indicates, as with other studi…
The water absorption behavior of tungsten oxide films has been studied by infrared attenuated total reflection (ATR) spectroscopy. Our results indicate that most of the water in the film is present in the initial stage of deposition and hardly any water is added at greater thicknesses. It is also seen that the water c…
The thermal diffusivity D of three metallic glasses Fe80B20, Fe40Ni40P14B6, and Fe32Ni36Cr14P12B6 has been measured from 160 to 500 K by the laser-flash radiometry method and the thermal conductivity K has been calculated from these data. The accuracy of D and K is 6% and 8%, respectively. The electronic contribution…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT5,10,15,20-Tetrakis(.alpha.,.alpha.,.alpha.,.alpha.-o-(N-tert-butyl-carbamoyl)phenyl)porphyrin: synthesis and redox properties of zinc(II) and copper(II) complexesLeonin Leondiadis and Michel MomenteauCite this: J. Org. Chem. 1989, 54, 26, 6135–6138Publication Date (Print):D…
Inelastic neutron scattering studies have been performed on ferroelectric ${\mathrm{KNbO}}_{3}$ in its orthorhombic phase at room temperature. Dispersion curves up to 10 THz have been determined for phonons propagating along the [101], [010], and [111] pseudocubic directions. A detailed intensity map of the inelastic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConcerning the miscibility of PVC-PVAc blendsDorab E. Bhagwagar, Carl J. Serman, Paul C. Painter, and Michael M. ColemanCite this: Macromolecules 1989, 22, 12, 4654–4656Publication Date (Print):December 1, 1989Publication History Published online1 May 2002Published inissue 1…
Abstract Die Synthese von 2‐(9‐Anthryl)‐1,8a‐dihydro‐1,1‐azulendicarbonitril ( 1a ) über das Tetrahydroazulen 5a , ausgehend von 8‐Methoxyheptafulven ( 3 ) durch [8 + 2]‐Cycloaddition, wird beschrieben. Durch Bestrahlung mit sichtbarem Licht wird 1a in das Vinylheptafulven 2a umgelagert. Dieses wiederum kann unter the…
Abstract The electrochemical study clarified that ditetrazolium salts are reduced not only to the half-reduced “monoformazans” but also to the fully-reduced “diformazans” at the potential where the first electron is transferred to generate the “tetrazolinyl radical”. The key reaction leading to the simultaneous genera…
The three structural genes rhaA, rhaB and rhaD, that specify the enzymes rhamnose isomerase, rhamnulose kinase and rhamnulose 1-phosphate aldolase respectively, have been cloned from Escherichia coli K-12. The precise location of the genes has been determined by gene complementation analysis and by enzymatic assays of…
Cholesteric liquid crystals which have a helical arrangement of oriented chiral molecules are expected to show novel cross couplings between fluxes and forces. The most convincing demonstration of these couplings is through a dynamical effect on the structure. Though Lehmann found a rotation of the structure under a t…
The crystallization mechanism in Li 2 O‐Al 2 O 3 ‐SiO 2 (1 : 1 : 6) glasses was investigated with TiO 2 or Ta 2 O 5 as nucleation agents, by differential thermal analysis, X‐ray diffractometry, and transmission electron microscopy. Phase separation occurred prior to crystallization in all of the glasses studied. Both…
Spoilage by microorganisms growing on food surfaces is the shelf-life limiting factor for many food products. Previous publications have shown that this shelf-life limitation can be overcome by edible coatings lowering the diffusion rate into the food of antimicrobial agents applied on food surfaces. A permeability ce…
Aluminum-doped ZnO thin films were prepared by ionized deposition on glass substrates. The crystallinity and electrical properties of Al-doped ZnO films prepared by ionized evaporation depend on the deposition conditions. The c-lattice constant of ZnO films increases with ionization current and acceleration voltage. T…
The literature apertaining to XPS studies of three classes of organic coatings (polybutadiene, epoxy co-polymers, and fusion bonded epoxy) on steel are reviewed in the light of the current theories of cathodic disbondment. All three mechanisms (oxide reduction, polymer hydrolysis, and interfacial failure) are readily…
Phase transformations in Ti–50V alloys containing oxygen in the range <0·095–0·36 wt-% have been studied at 750 and 400°C for times up to 1000 h. Results of electron microscopy, X-ray diffraction, and hardness testing indicate that oxygen widens the α+β phase field at 750°C and the metastable β phase miscibility gap a…