Materials Literature
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The authors examine the effects of neutron irradiation on ferroelectric (FE) lead-zirconate-titanate (PZT) thin films. The data show only a slight loss in the FE switched charge, as measured by the hysteresis loops, up to 1*10/sup 15/ n/m/sup 2/. The retained polarization, as measured by a pulse technique, showed a la…
Die bereits von Woodward bei der Chlorophyll‐Synthese diskutierten Isophlorine sind als janusköpfige Moleküle ‐ einerseits Porphyrine ( N , N ′‐Dihydroporphyrine), andererseits echte Annulene (der Hückel‐Regel nicht entsprechende [20]Annulene) ‐ strukturchemisch von besonderem Reiz. Während NH‐unsubstituierte Isophlor…
Abstract Grafting of maleic anhydride (MAH) onto ethylene‐propylene rubber (EPR) of apppoximately unitary ethylene/propylene molar ratio was performed by melt mixing in a laboratory‐scale internal mixer with the addition of dicumyl peroxide (DCP) as an initiator. Concurrent with the graft reaction, the simultaneous pr…
A range of protein single-crystal diffraction patterns, recorded with intense collimated synchrotron Xradiation are presented. These patterns illustrate the rich and varied nature of the diffuse scattering from this kind of crystal and suggest that the continuous background diffraction will be a source of specific inf…
In an attempt to develop biodegradable polymers which can be shaped in situ and adhere to living tissues, we synthesized esterurethane prepolymers which can be cured upon contact with water in living tissues. First, D,L-lactide polymerization or D,L-lactide-epsilon-caprolactone (50:50) copolymerization was carried out…
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…