Materials Literature
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Zn2+ ions octahedrally co-ordinated in a non-stoicheiometric Zn–Cr spinel-like phase are the active sites in the catalytic synthesis of methanol from syngas at high temperature.
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Drop calorimetry measurements for four Na 2 0‐Si0 2 liquids indicate that, to within ±0.5%, the heat capacities are temperature‐independent between 900 and 1800 K and additive functions of composition for liquids containing from 50 to 100 mol% Si0 2 . In this composition interval, the partial molar heat capacities of…
Electron micrographs of a silver resistant strain of Pseudomonas aeruginosa grown in the presence of 50 micrograms/ml Ag+ indicate that the surviving cells are resistant at the level of the cytoplasmic membrane. Spheroplasts of the resistant strain were not lysed by 1 h contact with 8 micrograms/ml Ag+, but were 36% a…
The strain rate sensitivity in a variety of metals is known to increase dramatically when the strain rate exceeds about 10/sup 3/ s/sup -1/. In copper, this behavior is analyzed in terms of the transition in rate controlling deformation mechanism from thermal activation to dislocation drag. The mobile dislocation dens…
Etude aux microscopes electroniques. Especes nouvelles pour l'Ocean Pacifique Sud, l'Ocean Indien ou l'hemisphere Nord. 16 especes sont des membres importants du nanoplancton
Wood materials have been successfully reinforced in the laboratory but rarely reach commercial markets. Even though this situation may continue for some time, reinforced wood materials should continue to be considered. The changing forest resource guarantees the change in economics of these materials in the future. In…
The solubilities of acetaminophen (N-(4-hydroxyphenyl) acetamide) (ACA) were determined in various aqueous cosolvent mixtures, i.e., ethanol-water, polyethylene glycol 400 (PEG 400)-water and polyethylene glycol 4000 (PEG 4000)-water, by ultraviolet spectrophotometry at 244nm, a 30±2°C. The mixed solvents were prepare…
[Au9{P(C6H4OMe-p)3}8](NO3)3crystallizes from CH2Cl2–toluene in two crystalline modifications one tetragonal and the other orthorhombic; single crystal X-ray crystallographic determinations on the two modifications have demonstrated that the tetragonal modification has a skeletal geometry derived from an icosahedron an…
The Hippo pathway was initially discovered in Drosophila melanogaster as a key regulator of tissue growth. It is an evolutionarily conserved signaling cascade regulating numerous biological processes, including cell growth and fate decision, organ size ...Read More
The smectic phases of the compound 4-(2'-methylbutyl)phenyl 4'-n-octylbiphenyl-4-carboxylate (2M4P8BC) were studied by means of polarized optical microscopy, miscibility, DSC, and X-ray diffraction techniques. The phase sequence Cr ↔ G ↔ J ↔ I ↔ C ↔ A has been determined, and consequently 2M4P8BC has been shown to be…
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…