Materials Literature
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The preparation of nickel powders by the ultrasonic spray pyrolysis of Ni(HCOO) 2 was studied. Phase‐pure nickel powder was obtained at as low as 350°C. HCOOH was a reducing source for nickel formation. Moreover, metallic nickel was obtained at a residence time as short as 0.1 s at 600°C. A broad range of particle mor…
Abstract We have developed techniques to map the distribution and composition of clay‐rich soils with portable field spectrometers on the ground. Spectral reflectance measurements in the 1800–2400‐nm region with 10‐nm resolution can distinguish smectites, which cause swelling, from illites and kaolinite that do not sw…
Magnetic domain configurations in the ferromagnetic shape memory alloy Ni/sub 2/MnGa are analyzed by means of Lorentz microscopy and noninterferometric phase reconstruction methods. Domain structures in the cubic phase consist of cross-tie walls in the thinnest portions of the foil, and more complex configurations in…
Half-metallic (HM) ferromagnetic materials have recently drawn intense interests due to their potential use in magnetoelectronic devices. Co-based Heusler alloys of the type CO/sub 2/MnX (X=Si,Ge), predicted to be HM by first principles band structure calculations, are of particular interest since they alone possess C…
A theoretical investigation of molecular ordering of smectic C liquuid crystals C8H17O-C6H4-C6H 4-COO-C6H4-OC8H17 { A }, C9H19O-C6H4-COO- C6H4-COO-C6H4-NO2 { B } and its binary mixtures { A+B } has been carried out by the method based on the Rayleigth-Schrodinger perturbation theory. The mutual arrangement of two mole…
Results obtained after 10 years’ atmospheric exposure of steel specimens painted with six different zinc-rich paint (ZRP) compositions are presented and discussed. The paints were formulated with ethyl silicate and epoxy-polyamide binders and included different zinc dust and conductive extender contents. Experimental…
Abstract Diarylperfluorocyclopentenes having 2-methoxy-5-phenylthiophene as the aryl groups were synthesized. Introduction of two methoxy substituents instead of methyl groups at the reactive carbons of 1,2-bis(5-phenyl-3-thienyl)perfluorocyclopentene decreased the photocycloreversion quantum yield by a factor of 103,…
Poly(2,6-(4,4-dialkyl)-4H-cyclopenta[2,1-b:3,4-b′]dithiophene) (PCPDT) homopolymers and poly[(2,7-(9,9-dialkyl)fluorene)-co-(2,6-(4,4-dialkyl)-4H-cyclopenta[2,1-b:3,4-b′]dithiophene)] (PF/PCPDT) copolymers have been synthesized according to Yamamoto with Ni(COD)2 (or NiCl2/Zn in the case of the homopolymer). PCPDT is…
The viscoelastic moduli (elasticity and dilational viscosity) of monolayers of P4HS have been studied over a broad frequency range (0.1 mHz–200 kHz) using a combination of relaxation and capillary waves techniques. The analysis of the surface pressure, the elasticity and the viscosity in the semidilute regime show tha…
beta-Alanine synthase (EC 3.5.1.6), which catalyzes the final step of pyrimidine catabolism, has only been characterized in mammals. A Saccharomyces kluyveri pyd3 mutant that is unable to grow on N-carbamyl-beta-alanine as the sole nitrogen source and exhibits diminished beta-alanine synthase activity was used to clon…
Polyethylene/graphite composites have been prepared by two different methods. In a first approach, the ethylene polymerization has been catalyzed by metallocene in the presence of neat graphite particles (NGC composites). A second series of composites (TGC) has been prepared by the polymerization-filling technique, wh…
Electron donor−π−acceptor chromophores 5, 9, 11, 18−20, 21, 22, 27, 28a, 28c, 31, 32, 34−36, 38a−c, 41a, 41c, and 42 have been synthesised. The donor units are 1,3-dithiole and ferrocene; conjugated ethylenic, phenyl, phenylenevinylene, thienyl, bithienyl, terthienyl, or thienylenevinylene linkers act as a central π-e…
Isocitrate dehydrogenase from Bacillus subtilis (BsIDH) is a member of a family of metal-dependent decarboxylating dehydrogenases. Its crystal structure was solved to 1.55 A and detailed comparisons with the homologue from Escherichia coli (EcIDH), the founding member of this family, were made. Although the two IDHs a…
Chiral non-symmetric dimeric liquid crystals consisting of a cholesteryl ester moiety as chiral entity and a biphenyl aromatic core, interconnected through n-butyl (C4) or n-pentyl (C5) parity alkylene spacers, have been synthesized and investigated for their liquid crystalline properties. All the dimers exhibit enant…
We have developed a single transistor ferroelectric memory using stack gate PZT/Al/sub 2/O/sub 3/ structure. For the same /spl sim/40 /spl Aring/ dielectric thickness, the PZT/Al/sub 2/O/sub 3//Si gate dielectric has much better C-V characteristics and larger threshold voltage shift than those of PZT/SiO/sub 2//Si. Be…
We report an experimental study of the shape of large liquid drops spreading on surfaces with patterns of wettability. A heterogeneous surface exhibits multiple energy minima of free energy for the three-phase system. In particular, when the distribution of defects on the substrate is periodic (square or hexagonal), i…
This paper proposes to use a fuzzy-neural network system to predict and display the drape image of garments made of different fabrics and styles. The new approach is used to develop a prototype drape prediction system to predict the drape of a lady's dress style made from different fabrics. The advantages and disadvan…
SiC–BN composites were prepared via the proposed in situ reaction, which used Si 3 N 4 , B 4 C, and carbon as reactants. Adding SiC powder to the reactants controlled the BN content in the composite. For comparison, SiC–BN composites with the same phase compositions were produced via conventional processing. The in si…
Cu substituted Ni-Zn ferrites, with different copper content, were prepared by a conventional ceramic technique. Structural and magnetic properties of the ferrites were characterized by X-ray diffraction, scanning electron microscopy, frequency dependent power loss, and high frequency (10/sup 6/-10/sup 9/ Hz) permeabi…
Polylactide, which is a biodegradable and bio-absorbable polymer having low immunogenicity and good biocompatibility, has been mainly studied for biomedical applications. Branched polymers have different rheological and mechanical properties compared with their linear counterparts owing to their molecular architecture…