Efficient synthesis of acetone from ethanol over ZnO–CaO catalyst
ZnO–CaO (molar ratio 9 : 1) exhibited a high catalytic activity (100% conversion) and selectivity (91%) for formation of acetone from ethanol at 673 K.
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Formation of metallo hydride, formyl, and alkyl complexes of Rh(TMTAA)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of metallo hydride, formyl, and alkyl complexes of Rh(TMTAA)Seth L. Van Voorhees and Bradford B. WaylandCite this: Organometallics 1987, 6, 1, 204–206Publication Date (Print):January 1, 1987Publication History Published online1 May 2002Published inissue 1 January 1…
Proceedings of the 32nd international SAMPE symposium and exhibition
This book compiles papers presented at a conference on the subject of advancement of materials and process engineering. Some of the topics discussed are: Effect of laser radiation on rapid processing of graphite-reinforced composites; fiber reinforced ceramic composites; thermal analysis for pultrusion process modelli…
Synthesis of a New Compound WAlB by the Use of Aluminium Flux
A new compound WAlB has been prepared using α-WB single crystals as a starting material and Al metal as a flux in argon atmosphere, and the optimum conditions for obtaining the compound in a pure phase were examined. A pure WAlB phase was obtained by heating a mixture of α-WB (0.66wt%) and Al at 1500°C for 10h. The cr…
Dielectric Performance of Improved Gas Insulated Bushing for UHV Gis
This paper describes a improved gas insulated bushing for ultra high voltage (UHV) SF6 gas insulated switchgear (GIS) which contains a simple capacitor core inside a porcelain housing. The effects of arrangement and capacitance of the capacitor core on the voltage distribution along the external porcelain surface were…
Effusion mass spectrometric determination of thermodynamic properties of the gaseous mono– and di-hydroxides of calcium and KCaO(g)
Effusion mass spectrometric measurements were made to obtain thermodynamic data for the gaseous mono- and di-hydroxides of calcium. An investigation of the reaction CaO(c)+½H2(g)= CaOH(g) in the temperature range 1720–1983 K led to third and second law ΔH°298 values of 444.3 ± 4 kJ mol–1 and 443.1 ± 16 kJ mol–1, respe…
The mosaic spread of very small crystals deduced from Laue diffraction patterns
Laue diffraction patterns have been recorded with synchrotron radiation for some very small crystals; in most of them the reflections are elongated radially. The Laue geometry is particularly sensitive to mosaic spread, and a relationship between mosaic spread and Laue spot extension is deduced. It appears that many v…
Mass transport in sandstones around dissolving plagioclase grains
The dissolution of plagioclase and precipitation of kaolinite is a common late diagenetic process in sandstones. The common occurrence on a thin-section scale of patchy kaolinite adjacent to a dissolving plagioclase grain is consistent with diffusional transport of dissolved constituents combined with precipitation on…
Modifying Matrix Materials for Tougher Composites
Attempts to toughen composites by using matrix materials of high toughness have not met expectations. The rationales given generally fall into two categories: size effect and constraints. This paper critically examines these issues and proposes approaches to test these rationales. The constraint effect is considered i…
Bindungsverhältnisse in den kristallinen Phasen von Caesiumhydroxid und ‐deuterohydroxid, CsOH und CsOD
Abstract Die kristallinen Phasen von CsOH und CsOD wurden zwischen 23 K und dem Schmelzpunkt mit Röntgen‐ und Neutronenbeugungsexperimenten sowie mit kalorimetrischen, IR‐ und Ramanspektroskopischen Messungen untersucht: equation image equation image In CsOD (TlI‐typ) bilden die ladungsasymmetrischen Hydroxidionen bei…
Development of New Diagnostic Method for Hot-Line XLPE Cables with Water Trees
A new insulation diagnostic method for XLPE cables containing water trees is presented. A dc component in the ac charging current of these cables was found to be a significant sign of the existence of water trees. The dc component has good correlations with such insulation characteristics of aged XLPE cables as ac bre…
An experimental and kinetic study of the breakdown of aluminous biotite at 800 °C : reaction microstructures and mineral chemistry
On a étudié expérimentalement la dégradation hors d'équilibre de biotite naturelle alumineuse et riche en fer en utilisant, comme matériel initial, des éprouvettes d'un schiste de biotite bien caractérisé. Les expériences ont été réalisées à 800 °C, 1 kbar, pendant 2 jours à 8 semaines. Tous les produits de la réactio…
Low-loss fluoride optical fibers for midinfrared optical communication
Attempts to improve transmission loss characteristics in fluoride fibers are described. Optical loss in current fibers is dominated by two major extrinsic loss factors, defect scatterers and impurities. Scatterer analysis using a Raman microprobe has revealed that the majority of them are ZrO2crystallites. These cryst…
The iron ores and associated sediments of the Chichali formation (Oxfordian to Valanginian) of the Trans-Indus Salt Range, Pakistan
A distinctive and widespread belemnite-bearing shale of the Tethyan region is well exposed in the Trans-Indus Salt Range as the Chichali Formation, where it contains two workable ironstone seams. Facies analysis indicates a pronounced deepening in the Upper Oxfordian and Kimmeridgian followed by two regressive cycles…
Molecular Model for the “Smectic D ” Mesophase
The “smectic D ” mesophase has been described in the past as a cubic arrangement of rods. In the present work, a molecular model, in which rods are formed by the stacking of small groups of molecules lying side by side, is proposed. The junction of the rods occurs through a cholestericlike twist of the molecules. A po…
Experimental and theoretical study of the nascent photoredox behavior of the aqueous hexachloroplatinate(IV) ion
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental and theoretical study of the nascent photoredox behavior of the aqueous hexachloroplatinate(IV) ionA. Goursot, A. D. Kirk, W. L. Waltz, G. B. Porter, and D. K. SharmaCite this: Inorg. Chem. 1987, 26, 1, 14–18Publication Date (Print):January 1, 1987Publication Hi…
Structure and Phase Diagram of Ti–V–H System at Room Temperature
The structure and phase diagram of Ti1−yVyHx (0≤y≤1.0, 0≤x≤2.0) have been studied by X-ray diffractometry at room temperature. The following crystallographic phases and their mixtures are identified and their phase boundaries are determined: α(hcp), β(bcc), γ(fcc), δ(fct) and ε(bct). One notable feature of this phase…
Serrated Flow in Inconel 625
Serrated flow in Inconel 625 was investigated in solution treated tensile specimens at strain rates between 4.17×10−5 s−1 and 4.17×10−3 s−1 at temperatures between 498 K and 923 K.The strain for the onset of Type A serrations and that for the gradual development of Type B serrations were able to be related, by the sam…
Dielectric relaxation spectroscopy of an acetamide–sodium thiocyanate eutectic mixture
The permittivity and dielectric loss of an acetamide–sodium thiocyanate mixture have been measured over a wide frequency interval, from 10–1 to 108 Hz. The observed dielectric dispersions have been interpreted on the basis of a polymeric model previously proposed. The dipole moment of the acetamide molecule as a funct…
Thermodynamic and transport studies of mixed oxides. The CeO 2 –UO 2 system
The electrical properties of CeO2–UO2 solid solutions are examined as a function of temperature, oxygen partial pressure and Ce/U ratio. A defect model is presented for this system which illustrates the manner in which CeO2- and UO2-rich solid solutions can be induced to cross over the stoichiometric composition to ox…