Materials Literature
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The phase diagram of a large-pitch cholesteric liquid crystal sandwiched between two parallel glass plates with homeotropic anchoring is determined both experimentally and theoretically. Contrary to previous experiments [P. Ribi\`ere and P. Oswald, J. Phys. (Paris) 51, 1703 (1990)], the materials chosen have a negativ…
ABSTRACT Total extractable lipid (TEL) and lipid composition were studied throughout the growth cycle in three freshwater diatoms ‐Cyclotella meneghiniana Kütz., Melosira varians C. A. Ag., and Stephanodiscus binderanus (Kütz.) Krieg under three light regimes (16:8 h LD, 20:4 h LD, and 12:12 h LD) at 20°C. Two of the…
The effect of vertical, sinusoidal, time-dependent gravitational acceleration on the onset of solutal convection during directional solidification is analyzed in the limit of large modulation frequency Ω. When the unmodulated state is unstable, the modulation amplitude required to stabilize the system is determined by…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvent and salt transfer upon redox switching of electroactive polymersStanley Bruckenstein and A. Robert HillmanCite this: J. Phys. Chem. 1991, 95, 26, 10748–10752Publication Date (Print):December 1, 1991Publication History Published online1 May 2002Published inissue 1 Dec…
Abstract Single crystal X-ray diffraction and electron-optical analysis were used to investigate the weathering of a chromium-bearing muscovite (fuchsite). The muscovite had mostly altered to kaolinite with minor amounts of halloysite occurring between kaolinite plates. Evidence for both epitactic and topotactic growt…
An attempt is proposed to modelize the coupling effects between heat transport, mass transport and solid shrinkage during the drying of like gels products. A special attention is laid upon the different ways to determine the solid displacement. Some experimental results are presented to validate the modelling approach.
Solutions of LiCF 3 SO 3 and LiClO 4 in acetone and in poly(propylene glycol) (PPG 400 and PPG 4000) have been compared by studying the nondegenerate, symmetric stretch (A 1 ,SO 3 ) and (A 1 ,ClO 4 ) Raman modes. The Raman spectra contain bands due to the symmetric stretching motion of the "free" anion and due to the…
Electron spin resonance in three- and quasi-two-dimensional graphites has been investigated between liquid-helium and room temperatures. The g shift (\ensuremath{\Delta}g) of three-dimensional graphite first increases with lowering temperature (T) so as to form a peak at 20 K, and then steeply falls off. An expression…
We studied the mechanism underlying acute organophosphate intoxication (OPI) through in-vivo and in-vitro electrophysiologic studies in rats injected with diisopropylfluorophosphate. Intoxicated rats showed weakness, repetitive compound muscle action potentials (CMAPs) in response to a single stimulus, and decremental…
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…