Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTsyn-Oxidative Polycyclization of Hydroxy Polyenes: A New Approach to Polyether SynthesisFrank E. McDonald and Timothy B. TowneCite this: J. Am. Chem. Soc. 1994, 116, 17, 7921–7922Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published i…
Simulated high burnup UO2 and (U, Gd)O2 pellets, doped with soluble fission product elements (Sr, Zr, Y, La, Ce, Nd), were prepared. Pellet thermal diffusivities were measured by a laser flash method and their thermal conductivities were evaluated. Thermal conductivities decreased with an increase in the total amount…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProperties and Molecular Structures of Osmium(II) Porphyrin Carbene Complexes: (5,10,15,20-tetra-p-tolylporphyrinato)osmium Di-p-tolylmethylidene and (5,10,15,20-tetra-p-tolylporphyrinato)osmium (Trimethylsilyl)methylideneJean-Pierre Djukic, Daniel A. Smith, Victor G. Jr. Yo…
The structure of liquid water in contact with a planar wall is calculated for the central force model by which water is modeled as a stoichiometric mixture of partially charged hydrogen and oxygen atoms interacting via effective spherical pair potentials. The density profiles near the wall are obtained from the Werthe…
The genus Dickieia is re-established for Navicula ulvacea, N. subinflata and N. expecta. Dickieia cells contain one complex chloroplast per cell; this consists of two ‘K’-shaped halves, linked by an isthmus containing the single discoid pyrenoid. The pyrenoid lies near one side of the girdle at the centre, while the n…
Lead zinc niobate [PZN: Pb(Zn1/3Nb2/3)O3] and compositions in the PZN-PbTiO3 system are promising materials for capacitors and actuators because of their high dielectric constant and excellent electrostrictive properties in single crystal form. PZN is one of the few relaxor ferroelectrics with high Curie temperature o…
The aim of this study was to investigate the effects of ultrasound irradiation on a biodegradable drug delivery system. Microporous, disk-shaped specimens of a 50-50% copolymer of polylactic and polyglycolic acids were gel cast from an acetone solution. A protein was incorporated in these specimens, which were then im…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrivanadium Polyoxoanion Chemistry. Part 4. Synthesis, Isolation, and Spectroscopic Characterization of Trivanadium Polyoxoanion-Supported (C5H5)Ti3+: (Bu4N)4[CpTi.cntdot.SiW9V3O40] and (Bu4N)6[CpTi.cntdot.P2W15V3O62]Brian M. Rapko, Matthias Pohl, and Richard G. FinkeCite th…
We investigate the efficiency of two recently introduced hybrid Monte Carlo algorithms for the off-lattice simulation of dense polymer melts. Their performance is assessed both with respect to the molecular dynamics method and new single-chain Monte Carlo techniques proposed recently. Our findings show that the long-t…
Ceramic films, containing AI 2 O 3 , with up to 40 vol% ZrO 2 , have been fabricated using the tape casting process. Finer powders (average mean diameter of 250–300 nm) than have generally been reported for tape casting were used in this study. The optimum formulation for tape casting is affected substantially by decr…
The effects of UV irradiation on the properties of gel films prepared from Zr- n -butoxides modified with acetylacetone (AcAc) have been studied. The irradiation with UV light corresponding to the π-π * transition in the chelate ring of AcAc was found to dissociate the chelate bonds in the gel films and simultaneously…
Thermal and mechanical properties, H. Brody textile properties, D.W. Lloyd dyeability 1 - nylon fibres, D.M. Lewis dyeability 2 - polyacrylonitrile and polyester fibres, S.M. Burkinshaw clothing and fabrics, I. Holme carpets, E.D. Williams nonwovens, P.A. Smith rubber composites, S.K. Chawla high performance fibres 1…
Calculations of the phase transition temperature and the critical concentration of electric dipoles which induce in the host crystal lattice the phase transition with the appearance of long-range order are carried out. These calculations are made by considering the additional static random electric fields owing to def…
The efficiency of thermoelectric devices are analyzed for a superlattice of semiconductor quantum wells. It is assumed that the quantum wells are the thermoelectric active elements, and the layers between conduct only heat. It is shown that the efficiency of the device depends on the property of both layers.
An experimental investigation of the flexural properties of a variety of brittle multilayer materials has been conducted. The results have been compared with the predictions of a model presented in a companion paper. Three types of systems have been studied. The first consisted of glass sheets bonded together with a t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEpitaxial Thin Films of Large Organic Molecules: Characterization of Phthalocyanine and Coronene Overlayers on the Layered Semiconductors MoS2 and SnS2C. D. England, G. E. Collins, T. J. Schuerlein, and N. R. ArmstrongCite this: Langmuir 1994, 10, 8, 2748–2756Publication Dat…
Amorphous, optically isotropic films of photochromic liquid crystalline copolymers have been prepared and irradiated with linearly polarized light. In this way high values of dichroism and birefringence have been induced.
BACKGROUND: Intimal hyperplasia (IH), a cause of early graft failure, may be regulated by leukocyte-elaborated cytokines. We investigated leukocyte infiltration and cytokine gene expression in vein grafts. METHODS: Epigastric vein to femoral artery grafts were performed in Lewis rats and harvested on day 4 and weeks 1…
Carbon nitride thin films have been prepared by NH 3 -ion-beam-assisted deposition with bombardment energies of 200-800 eV at room temperature. These films have been characterized by transmission electron microscopy, Auger electron spectroscopy and x-ray photoelectron spectroscopy for chemical analysis. It was found t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHole Localization or Delocalization? An Optical, Raman, and Redox Study of Lanthanide Porphyrin-Phthalocyanine Sandwich-Type HeterocomplexesThu-Hoa Tran-Thi, Tony A. Mattioli, Driss Chabach, Andre De Cian, and Raymond WeissCite this: J. Phys. Chem. 1994, 98, 34, 8279–8288Pub…