Materials Literature
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Electronic Properties and Orientation Studies of Poly‐3‐Alkylselenophene Electrochemically Deposited on Pt As Observed by NEXAFS, Tourillon, G., Dartyge, E., Guay, D., Mahatsekake, C., Andrieu, C. G., Bernstorff, S., Braun, W.
Abstract Polymeric catenanes have been made from poly(2,6‐dimethyl‐1,4‐phenylene oxide) crosslinked in the presence of several, paucidisperse poly(dimethylsiloxane) cyclics of varying degrees of polymerization. The fraction of cyclic threaded or captured by the polymer network increases as the degree polymerization of…
Procedures for in vitro establishment, rapid shoot proliferation, and ex vitro plantlet acclimatization of Cryptocoryne lucens de Witt were determined. Shoot cultures were established from surface-sterilized shoot tips cultured on Linsmaier and Skoog salts and vitamins medium (LS) solidified with 0.8% (w/v) agar and s…
Abstract Different pure complexes were synthesized by an interchange reaction of BF 3 ‐etherate with amines in dichloromethane. All of the resulting complexes are solid, but they can be dissolved in a low‐molecular‐weight poly(ethylene oxide) to favour their use as initiators. DSC analysis demonstrated strong interact…
Aluminum chelate and calcium nitrate precursors were used to synthesize amorphous calcium aluminate powders by solgel processing at < 900°C. The method of preparation and results of characterization of the gels by thermogravimetric analysis, X‐ray diffraction, scanning Auger microscopy, and single‐point BET analysi…
Abstract The X-ray structure of Fe(OEP)(OMe) is reported: Fe(C36H44N4)(CH3O), F.W.=619.7, monoclinic, P21/c, a=13.412(5) Å, c=18.912(8) Å, β=106.28(3)° and V=3348(4) Å3, Z=4. A methoxide-coordinated iron(III) porphyrinate with π-π dimeric porphyrin interaction in the solid state was revealed. The facile formation of t…
Degradation of interturn insulation caused by repetitive surges is studied for coils in three motors stators. In each stator, the coils are isolated and divided into several groups. Breakdown voltages of coils in one group are measured for 0.1 mu s risetime impulses and the average breakdown voltage of these unaged co…
Neutron diffraction maps have been used to assign the rotor conformations of the hydroxyl hydrogens in trypsin. Knowledge of these conformations is used to assess the relative importance of steric and electrostatic effects in conferring the H-bonding geometries of these groups. A general finding was that most hydroxyl…
The inelastic behavior of solid circular bars twisted to arbitrarily large strains is considered. Various phenomenological constitutive laws currently employed to model finite strain inelastic behavior are shown to lead to closed-form analytical solutions for torsion. These include rate-independent elastic-plastic iso…
The non-linear optical properties of semiconductors are reviewed. Examples are given of optical non-linearities which are connected with real or virtual excitations in the electronic system of a semiconductor, and others which are due to photothermal effects. Also included are some aspects of electro-optics, and the a…
Abstract The action of two vapour phase inhibitors (VPI), dicyclohexyl‐ammonium nitrite (DICHAN) and dicyclohexylamine (DICHAMIN), on the atmospheric corrosion of mild steel at a relative humidity of 100% and under isothermal conditions (25 °C) has been studied. In order to obtain electrochemical data with thin adsorb…
During the oxidation of redued single crystals of Al‐doped rutile, unusual anisotropies in color‐boundary migration have been observed that are opposite to those predicted from published diffusion data. Analysis of the redox kinetics and of surface segregation (using ESCA and AES) shows that rapid transport of minorit…
Abstract Clay mineralogy and petrography of the Early to Middle Eocene succession of the Dammam dome, Saudi Arabia, comprising the Rus and Dammam Formations, were studied using X-ray powder diffraction, light microscopy, and scanning electron microscopy. These formations consist of alternations of dolomite, dolomitic…
A mathematical approach is presented to calculate and predict the strength of a false twist yarn spun by means of a single air jet, based on an idealized yarn structure model developed in an earlier paper. The strength of the wrapping fibers and the core fibers and the frictional resistance of slipping fibers in the c…
SUMMARY In the preceding paper the effect of the primary beam scattering on contrast in high‐pressure SEM techniques such as moist‐environment ambient‐temperature SEM and environmental SEM was examined. Here, the effect of the scattering of the emissive components on the image formation and contrast in high‐pressure S…
The degradation of the pulsed surface flashover performance of 99.9% pure polycrystalline alumina in an insulator-bridged vacuum gap, due to the mechanical grinding and finishing of the insulator is reported. The flashover characteristics of three different surface finishes—as-fired (0.8 μm), a ground surface (0.25 μm…
We observe bond-selective fragmentation of the nitrous oxide molecule upon site-specific 1 s excitation at either the terminal or the central nitrogen atom. Our results can be interpreted as a chemical "memory effect" where the fragmentation process memorizes the inital site of energy deposition. We empty a new "Zero…
Abstract Ultrasonic emission was found to accompany spherulitic crystallization of polymers from the melt. The source of acoustic waves was identified as an abrupt negative pressure release in regions of melt occluded by spherulites (weak spots) in the course of crystallization. The buildup of a negative pressure in o…
Numerous synthetic biomaterials have been developed as vascular substitutes. In vitro, ex vivo and in vivo studies have demonstrated that in animals, selected materials, i.e., Dacron and ePTFE (expanded polytetrafluoroethylene) grafts, are successfully incorporated in both the large and the small caliber host arteries…
Ceria‐ and yttria‐doped tetragonal polycrystalline zirconia ceramics were ground at temperatures as high as 1100°C. X‐ray diffraction revealed that the intensity ratio I (002) / I (200) increased (to as high as ∼4.5) compared with that from the as‐sintered surfaces (∼0.55). The enhancement in I (002) / I (200) at temp…