Materials Literature
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This study was performed to assess the relative contributions of contrast medium osmolality and chemotoxicity to contrast-induced blood-brain barrier (BBB) damage. Experimental carotid angiography was carried out in rabbits with mannitol at an osmolality of 714 mOsm/kg, with the nonionic, monomeric contrast media iohe…
The morphology and the formation behavior of various types of defects in porous anodic films formed on high purity aluminum have been studied by electron microscopy. Circular voids were found within anion‐free layers at the triple polar junctions where three cells met. The voids contained oxide particles which appeare…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron spin resonance study of the special features of plasma-induced radicals and their corresponding peroxy radicals in polytetrafluoroethyleneMasayuki Kuzuya, Hideki Ito, Shinichi Kondo, Nahoko Noda, and Akihiro NoguchiCite this: Macromolecules 1991, 24, 25, 6612–6617Pu…
Crystallization and melting, heat of fusion, and degree of crystallinity of syndiotactic PP were investigated. The double peak melting behavior was established for the partially crystalline polymer. A Hoffman-Weeks extrapolation resulted in equilibrium melting points of 151°C and 155°C for two polymers with relatively…
A programme of mechanical testing has been carried out to determine the effect of a variety of embedded optical fibres on the properties of carbon/epoxide composite systems. The properties of interest were longitudinal and transverse tension, longitudinal compression, inter- laminar and in-plane shear. The variables i…
Abstract Experimental kinetic data on n‐heptane pyrolytic and catalytic steam cracking, and product distribution data were obtained at reaction temperatures from 700° to 800°C at atmospheric pressure. The overall thermal cracking of n‐heptane was compared to the cracking in presence of the basic catalysts MgO, CaO (lo…
Crack resistance characteristics and fatigue properties have been investigated in Ce‐TZP ceramics with different grain sizes. The relatively low critical transformation stress allows the development of larger transformation zones (≦200 μm), leading to flaw‐tolerant behavior. However, autocatalytic transformation proce…
The effects of the concentration of a maleated polypropylene additive (0 to 5 percent by weight) and of extrusion blending temperature (190°C to 250°C) on the mechanical properties of extruded and injection-molded polypropylene-wood flour composites were investigated. The effects of maleated polypropylene additive on…
Following a major shortage of 99Mo in the 2009–2010 period, concern grew that the aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as the target material. The Organisation for Economic Co-...Read More
Hydrogenated amorphous carbon (a-C:H) is important as a material for hard coatings. Here, we describe the structural properties of computer-generated models of a-C and a-C:H with nearly ideal ${\mathit{sp}}^{3}$ bonding. Without H, the material is very hard, but it is highly strained compared with ordinary ${\mathit{s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, crystal and molecular structure, and magnetic properties of bis[(.mu.-3,5-diamino-1,2,4-triazole-N1,N2-bis(.mu.-3,5-diamino-1,2,4-triazolato-N1,N2)triaquacobalt(II))]cobalt(III) trichloride nonahydrateL. Antolini, A. C. Fabretti, D. Gatteschi, A. Giusti, and R. Se…
Abstract Intrinsic viscosities and gel permeation chromatography data were used to evaluate the Mark–Houwink constants of the soluble electronically conducting polymer, poly(3‐hexylthiophene) (P3HT): K and a are 2.28 × 10 ‐3 cm 3 /g and 0.96, respectively, in tetrahydrofuran (THF) at 25°C. Mark–Houwink constants were…
Abstract The Kämpf & Schwertmann (1982) procedure for concentrating iron oxides in soil clays by dissolution of kaolin and gibbsite by boiling for 1 h in 5 m NaOH may not dissolve all kaolin, and also results in the precipitation of sodalite. For the complete dissolution of kaolin in kaolin-rich soil clays a boili…
Abstract Solutions containing AlCl 3 and Si(OH) 4 (concentrations ≤ 1.5 mM with molar Si:Al ratios of 1:2, 1:1 and 3:1) and FeCl 2 (0, 0.5 and 1.0 mM) were adjusted to pH 8 with Ca(OH) 2 , and incubated at 23°C and 89°C without exclusion of air in the presence of CaCO 3 for 8–12 weeks. The products were characterized…
Abstract Aufgrund der günstigen Eigenschaftskombination von Siliciumnitridkeramik ‐ hohe Festigkeit bei hohen Temperaturen, Korrosions‐ und Verschleißbeständigkeit, große Härte und geringe Dichte ‐ist dieser Werkstoff von großem Interesse für Hochleistungsanwendungen im Maschinen‐, Motoren‐ und Turbinenbau. Die Basis…
Abstract The areas under the linear loss modulus versus temperature curves (loss area, LA) and tan δ versus temperature curves (TA) were evaluated for a number of acrylic, methacrylic, styrenic and butadiene based copolymers and interpenetrating polymer networks, IPNs, as a function of crosslink density and comliositi…
Abstract Four 15 g samples of an unsedimented Wyoming bentonite were treated with 200 cm 3 of 0·025, 0·050, 0·100 and 0·250 mol dm −3 H 2 SO 4 for 1 h at room temperature (samples I–IV, respectively). Three further 15 g samples were treated with 200 cm 3 of 50% (v/v) H 2 SO 4 for 1 h at 20°C (sample V), and 1 and 2 h…
Abstract Polycarbonate together with the acrylonitrile/butadiene/styrene copolymers, and the poly amides constitute the leading groups of engineering thermoplastics; for polycarbonate in particular, continued dynamic growth is prophesized. The underlying reason for this lies not only in its outstanding combination of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of (octaethylporphyrinato)lutetium and -yttrium complexes: synthesis and reactivity of (OEP)MX derivatives and the selective activation of O2 by (OEP)Y(.mu.-Me)2AlMe2Colin J. Schaverien and A. Guy OrpenCite this: Inorg. Chem. 1991, 30, 26, 4968–4978Publication Date…
Abstract Commingled fabrics composed of yarns containing both the reinforcement and the matrix in fiber form are an innovative preform for thermoplastic composite materials. The material is consolidated into a rigid structure by the application of heat and pressure. A mathematical model of the consolidation process fo…