Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract Cost effective loss prevention requires an optimizing strategy to prevent, moderate (relieve) and contain runaway reactions. Ensuring that an emergency relief system design will either avoid or accommodate two‐phase vapor‐liquid flow is of particular importance. Use of adiabatic runaway reaction test informat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnergy- and electron-transfer shuttling by a soluble, bifunctional redox polymerJanet N. Younathan, Wayne E. Jones Jr., and Thomas J. MeyerCite this: J. Phys. Chem. 1991, 95, 1, 488–492Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Publ…
Une nouvelle méthode non destructive, pour la mesure des densités de charges d'espace dans les isolants solides, est décrite. Cette méthode, dite de “ l'onde thermique ” est basée sur la diffusion d'un front de chaleur appliqué à une des faces de l'éprouvette et sur la dilatation non uniforme qui en résulte. A partir…
The nature of the species that gives rise to living carbocationic polymerization (LP+Pzn) of isobutylene (IB) coinitiated by Friedel-Crafts acids (FCA) in the presence of electron pair donors (ED) has been investigated. It is proposed that the key species responsible for mediating LC+Pzn of IB are FCA·ED complexes, fo…
A new model for fabric hand assessment is developed that uses fuzzy comprehensive evaluation to predict hand. One of the main aspects of this research is the establishment of a fuzzy relation matrix R for objective evaluation of fabric hand. This was achieved by investigating a large number ( n = 100) of light weight…
Electrochemical preparation of β-MnO2-incorporated polypyrrole films resulted in high energy capacity cathode-active materials for rechargeable lithium batteries.
The crystallization kinetics of chalcogenide films, to which small concentrations of foreign elements such as Cu, Co, Pb, Ag and Sb are added, were investigated theoretically. It is found that the critical cooling rate can be taken as the criterion for evaluating the roles of various elements on the erasure speed. Sin…
The recently reported paramagnetic compounds (dbdab)2M (dbdab = 1,4-di-tert-butyl-1,4-diazabutadiene, M = Ga, Al), both contain trivalent metal bound to one singly and one doubly reduced dbdab ligand; the larger metal hyperfine coupling in the EPR spectrum of the gallium complex is not due to a gallium(II) oxidation s…
The reaction of (But)3Ga with an excess of H2S in pentane at ambient temperature results in the formation of the hydrosulphido bridged dimer [(But)2Ga(µ-SH)]2, 1, which upon mild thermolysis is converted to the cubic tetramer [(But)GaS]42. Compounds 1 and 2 have been characterized by IR, NMR and mass spectroscopy and…
Picosecond time resolved luminescence was employed for monitoring the decay of electronic excited reactants on the surface of oxide semiconductors. Decay of cresyl violet monomers was determined on TiO2 and on α-Al2O3 by measuring decay curves over a wide range of very low coverages. The decay curves showed a characte…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin and spinless conductivity in polypyrrole. Evidence for mixed-valence conductionG. Zotti and G. SchiavonCite this: Chem. Mater. 1991, 3, 1, 62–65Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 January 1991https://…
Experimental demonstration of active vibration and structural acoustic control using shape memory alloy (SMA) hybrid composites [C. A. Rogers, in Proceedings of the International Congress on Recent Developments in Air and Structure Borne Sound and Vibration (to be published)] has provided the motivation for investigat…
Abstract Bacteria are able to synthesize a wide variety of different thermoplastic polyhydroxyalkanoic acids (PHA). The physiology of PHA metabolism has been studied in most detail in the aerobic hydrogen bacterium Alcaligenes eutrophus . Strains of this bacterium are already used for the production of biodegradable p…
Abstract Hydrogenation of phenol to cyclohexanone has been investigated in the temperature range 160–250°C on a series of Pd/MgO catalysts. At 160°C the orders of reaction were found on all catalysts to be about −1 with respect to phenol and about + 1 with respect to hydrogen. On the basis of the kinetic results it is…
Abstract The oscillations of the current which take place during the anodic dissolution of silicon in fluoride electrolytes have been investigated. These oscillations occur only upon a perturbation in the electrode potential, and are associated with a fluctuation of the thickness of an oxide layer on the electrode sur…
We report a new surface phenomenon in flowing colloidal suspensions of anisotropic particles. It is characterized by a decrease in the probability of presence of the solute particles near the cell walls when the solution is submitted to Poiseuille flows exceeding a minimum shear rate. The effect has been detected on d…
Preparation of potassium niobate from metal alkoxides was investigated. Potassium‐niobium ethoxide, KNb(OC 2 H 5 ) 6 , and potassium‐niobium propoxide, KNb(OC 3 H 7 ) 6 , were synthesized and subsequently hydrolyzed using several water concentrations (0.75 to 6.0 mol of water/(mol of alkoxide)). Rapid precipitation of…
The complexes cis-[MCl(CO)2(n-OPhVPy)](M = Rh, Ir; n-OPhVPy =trans-4-alkyloxy-4′-stilbazole) are mesomorphic showing nematic and smectic A phases at temperatures below 140 °C.
Abstract A series of segmented polyurea urethane and polyurea block copolymers based on a hexane diisocyanate (HDI) modified aminopropyl terminated polydimethylsiloxane soft segment was synthesized. The hard segments consisted of 4,4′‐methylene diphenylene diisocyanate (MDI) which was chain extended with 1,4‐butanedio…
Organically modified ‘Keggin-type’ oxopolymetalates of general chemical formula [R]4[SiW11O40(SiR″)2], (R = H+, K+ or NR′4+; R′= Me or Bu; R″= Et, CHCH2, C10H21 or Ph) have been synthesised by three different procedures. Large quantities were obtained in high purity and good yield. Their structure has been established…