Materials Literature
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We report on the optical reflective properties of the planar texture of cholesteric liquid crystal reflective displays. The reflecting liquid-crystal medium is partitioned into many distinguishable domains, each of which is characterized by its local dielectric anisotropy. Such a multidomain cholesteric liquid crystal…
Wheat germ agglutinin isolectin 3 (WGA3) was crystallized from 10 mM acetate buffer at pH 4.9 containing 6 mM CaCl(2) and 4%(v/v) ethanol. The crystal belongs to monoclinic space group P2(1) with unit-cell dimensions a = 44.86, b = 91.02, c = 44.86 A, and beta = 110.22 degrees. The asymmetric unit contains two molecul…
Abstract The infrared and Raman spectra of L ‐asparagine and ND 3 + , ND 2 ‐ L ‐asparagine as solid samples were recorded. The data obtained were used to propose a general assignment of the fundamental vibrational modes on the basis of the measured isotopic shifts and correlations with previous data reported for other…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTApplication of Secondary Nucleation Theory to Semirigid Macromolecules: PEEK, PET, and PENF. J. Medellin-Rodriguez, P. J. Phillips, and J. S. LinCite this: Macromolecules 1995, 28, 23, 7744–7755Publication Date (Print):November 1, 1995Publication History Published online1 Ma…
Elastic instabilities have been used to explain the occurrence of amorphization in both \ensuremath{\alpha}-quartz (${\mathrm{SiO}}_{2}$) and \ensuremath{\alpha}-berlinite (${\mathrm{AlPO}}_{4}$). However, there is a dynamical instability at (1/3,1/3,0) in the Brillouin zone preceding the elastic instability for both…
The low-temperature specific heat of the organic conductors \ensuremath{\alpha}-(BEDT-TTF${)}_{2}$MHg(SCN${)}_{4}$ (M=K, Rb, and ${\mathrm{NH}}_{4}$) has been measured at temperatures down to 0.25 K and under magnetic field up to 8 T. The electronic specific-heat coefficient \ensuremath{\gamma} is estimated at 7.0\ifm…
A new type of vanadium oxide ( V 2 O 5 ‐ n H 2 O ) with a structure intermediate between the amorphous and the crystalline state is synthesized by a reaction of metallic vanadium with hydrogen peroxide. Its electrochemical properties in relation to lithium intercalation have been investigated in a 1 M LiClO 4 / propyl…
Results from a plasma chemistry model provide predictions of spatially and temporally averaged plasma properties. Application of the model to chlorine-etch process conditions, typical of a high plasma-density transformer coupled plasma reactor, provides plasma composition dependence on reactor operating parameter such…
Abstract Verglichen werden die kristallographischen Eigenschaften der Auride M 3 AuO und der Alkalimetallhalogenidoxide M 3 XO (M = K, Rb, Cs; × = Br, I). Rb 3 BrO, Rb 3 IO, Cs 3 BrO und Cs 3 IO werden erstmals dargestellt und strukturell charakterisiert: Rb 3 BrO (a = 5,465(1) Å) kristallisiert als kubischer anti‐Per…
Abstract Composites of wheat straw fibers with polypropylene (iPP) and maleic anhydride modified polypropylene (iPPMA) were prepared. Before being mixed with polypropylene matrices, the wheat straw fibers were subjected to a steam explosion process that induces morphological and structural changes in lignocellulosic m…
Scalar order parameter measurements of the liquid crystal blue phase II (BPII), taken using the Kossel diagram technique, are presented. The temperature dependence of the order parameter is found to follow a curve predicted by the Landau theory. The order parameter data, derived from the diffracted light intensity, ar…
An investigation was carried out concerning the effect of mullite seed particles on phase development, densification behavior, and microstructure evolution in powder compacts prepared with silica/alumina microcomposite particles. The incorporation of ∼2 wt% seed particles in the microcomposite powder compacts had rela…
Mechanical testing of controlled-purity Ni-x% Cr-9% Fe-y% C alloys at 360°C revealed an environmental enhancement in intergranular (IG) cracking and time-dependent deformation in high-purity (HP) and primary water (PW) over that exhibited in argon. Dimples on the IG facets indicated a creep void nucleation and growth…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSol-Gel Preparation and Characterization of Magnesium Peroxide, Magnesium Hydroxide Methoxide, and Randomly and (111) Oriented MgO Thin FilmsAnthony A. Rywak, James M. Burlitch, and Thomas M. LoehrCite this: Chem. Mater. 1995, 7, 11, 2028–2038Publication Date (Print):Novembe…
Diamondlike carbon (DLC) films were deposited using unbalanced planar circular magnetron sputtering of a graphite target with argon as the support gas. The properties of the DLC films were studied as functions of the applied negative substrate bias voltage, 50–200 V, and argon gas pressure, 2–6 mTorr. The hydrogen con…
Part 1: Nuclear Physics 1. The atomic nucleus. 2. Experimental techniques. 3. General properties of nuclei. 4. Nuclear models. 5. Decay of unstable nuclei. 6. Nuclear reactions. Part 2: Particle Physics 7. Sub-nuclear physics - an overview. 8. Symmetry transformations and conservation laws. 9. Hadron spectroscopy. 10.…
Opephora parva, O. pacifica and O. perminuta are commonly reported from brackish and marine sediments worldwide, but their true identity is unclear. Therefore, isotype material of these three taxa was examined using light microscopy. In addition, several populations from different localities in Europe, Africa, South A…
An Oligocene through early Miocene diatom zonation is proposed for the North Pacific based on the stratigraphic documentation and illustration of diatom taxa from Hole 884B on the eastern flank of Detroit Seamount in the northwest Pacific. The Hole 884B section is unique in the North Pacific because it contains a near…
Controlled amounts of GaP and P were added to a Si0.8Ge0.2 matrix by a powder-metallurgical technique in order to evaluate the optimum composition for thermoelectric applications. Bulk determination of the gallium and phosphorus content in fully dense, hot pressed compacts was performed by inductively coupled plasma a…
Complex hydrodynamics near the moving contact line control spreading of a fluid across a solid surface. In the confined region near the contact line, velocity gradients in the fluid are large and viscous forces control the shape of the fluid/fluid interface. The present model for liquid spreading describes the viscous…