Materials Literature
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Menisci contained in capillaries of uniform cross-section can be broadly classed according to whether wedge-like liquid structures exist, as in triangular-section tubes, or do not exist, as in circular-section tubes. In tubes which form wedge menisci the liquid in the wedge adopts a form so that a section through the…
Presentation d'un nouvel indice analytique permettant d'evaluer la contrainte thermique des environnements froids et representant l'isolation d'habillement minimum necessaire pour le maintien d'un bon equilibre thermique. Obtention de cet indice (IREQ) a partir d'une analyse d'echange thermique basee sur les equations…
Methods to calculate the gamma ray exposure due to radioactivity of building materials in dwellings and to measure the rate of radon exhalation from these materials are presented. The average rates of gamma ray exposure in dwellings made of different Finnish materials were calculated and the results were compared with…
We report the observation of sharp volume phase transition in the non‐ionic N‐isopropylacrylamide gel. The finding demonstrates that the phase transition of gels may be general and not confined to ionic gels as was previously considered. It will allow us to separate the electrostatic effects and network‐structural eff…
P. G. Jones, Chem. Soc. Rev., 1984, 13, 157 DOI: 10.1039/CS9841300157
Nitrogen oxide is synthetized from a N2-35 % O2 mixture flowing (22 Nl/h) through a microwave discharge. The total pressure is equal to 50 torr. The optimal value of energy consumption, equal to 28 MJ/kg NO, is obtained with catalyst such as MoO3. Results are improved by 53 % in comparison with the industrial process…
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The decomposition of ammonia on stepped Ru(1 1 10) and flat Ru(0 0 1) surfaces has been investigated by Auger electron spectroscopy, low-energy electron diffraction, thermal-desorption studies and kinetic studies. The reaction takes place at ca. 400 K, and N2 and H2 are formed stoichiometrically. At lower temperatures…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntermediates in the formation of gold clusters. Preparation and x-ray analysis of [Au7(PPh3)7]+ and synthesis and characterization of [Au8(PPh3)6I]PF6J. W. A. Van der Velden, P. T. Beurskens, J. J. Bour, W. P. Bosman, J. H. Noordik, M. Kolenbrander, and J. A. K. M. BuskesCi…
Discharge and charge characteristics of cathode‐active materials for lithium batteries were studied. Electron acceptors of charge transfer complex with high electron affinity were examined as cathode‐active materials because they were expected to have high cell voltage. These electron acceptors are 2,4,7‐trinitro‐9‐fl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInduced internal redox processes in molybdenum-sulfur chemistry: conversion of tetrathiomolybdate(2-) ion to octathiodimolybdate(2-) ion by organic disulfidesWie Hin Pan, Mark A. Harmer, Thomas R. Halbert, and Edward I. StiefelCite this: J. Am. Chem. Soc. 1984, 106, 2, 459–4…
This theory determines the dependence of the Huggins coefficient kH on the interaction potential between rigid spheres. Hard-sphere interactions represent a minimum, with kH increasing for either attractive or longer-range repulsive potentials. Although derived for model potentials, the sticky sphere for short-range a…
Description Discusses zirconium extraction and reduction to tubes; recent work on basic properties; fracture properties, including stress-corrosion cracking and hydrogen cracking; high-temperature properties; texture-related work with special interest in creep and growth; and waterside corrosion.
Determination de la structure cristalline de la forme basse temperature de BaB 2 O 4 . Systeme trigonal-groupe d'espace R3c avec a=8,380 A, α=96,65°. Cette structure est voisine de la forme haute temperature de BaB 2 O 4 , contenant des anions [B 3 O 6 ] 3− quasi-plan. Coordination du baryum differente entre les 2 for…
The structural and electrical properties of different (TMTTF)2MF 6 compounds are described and the rôle of the anion size is investigated through the behaviour of the SbF6 salt for which a critical increase of the resistivity occurs below 154 K. The effect of alloying (TMTTF)2SbF6 with AsF6 or PF6 is also studied and…
Diatoms, which possess distinctive skeletal valves of opaline silica, show steady incremental reduction of size with successive vegetative divisions. Size reduction is explained by consistent formation of slightly smaller new valves inside the old ones. Diatoms cannot be induced to become sexual until a certain critic…
Ultrasonic irradiation of a mixture of benzyl bromide, potassium cyanide, and alumina in an aromatic solvent yields benzyl cyanide, whereas mechanical agitation gives the Friedel–Crafts type product; sonication changes the main reaction pathway from aromatic electrophilic to aliphatic nucleophilic substitution.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDicopper(II) chloro and azido inclusion complexes of the [24-ane-N2S4] binucleating macrocycle. Synthesis, crystal and molecular structures, and spectral, magnetic, and electrochemical propertiesYvette Agnus, Remy Louis, Jean Paul Gisselbrecht, and Raymond WeissCite this: J.…
This paper will present evidence indicating that the root cause of cathodic disbondment of protective organic coatings is the displacement of the coating by a high pH aqueous film between the coating and the substrate. This is based upon experiments involving delamination caused by soaking in ammonium hydroxide soluti…
The new mineral katoite, Ca3Al2(SiO4)(OH)8, occurs in Pietramassa near Montalto di Castro (Viterbo, Italy), associated with many other hydrated calcium silicates and aluminates in the vugs of a phonolite which effused through argillaceous marls of Pliocene age. Microprobe and TG analyses yielded the empirical formula…