Materials Literature
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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…
Steady-state fluorescence spectra and decays of excitations of a phosphorus-containing dendrimer labeled with 12 internal labels and of an iminophosphorane model compound bearing two labels dissolved in acetonitrile, diglyme, 1,4-dioxane, triethylene glycol, and cyclohexanol revealed that the interior of dendrimers co…
3-isopropylmalate dehydrogenase (IPMDH) from the psychrotrophic bacterium Vibrio sp. I5 has been expressed in Escherichia coli and purified. This cold-adapted enzyme is highly homologous with IPMDHs from other organisms, including mesophilic E. coli and thermophilic Thermus thermophilus bacteria. Its molecular propert…
The novel thioantimonate(III) [Fe(C4H13N3)2]Sb6S10 · 0.5 H2O was synthesised under mild hydrothermal conditions by allowing elemental Fe, Sb, and S to react in a 50% diethylenetriamine (dien) solution. The compound crystallises in the monoclinic space group C2/c with a = 33.789(3), b = 8.5697(4), c = 24.620(2) Å, β =…
Abstract There has been little effort. to quantitatively understand graft copolymerization in batch and continuous mixers. Little information exists on the evolution of grafting reactions with respect to residence time in an internal mixer or along the screw axis in a twin‐screw extruder. In this study, maleic anhydri…
The effect of starting SiC powder (β‐SiC or α‐SiC), with simultaneous additions of Al 2 O 3 and Y 2 O 3 , on the microstructural evolution of liquid‐phase‐sintered (LPS) SiC has been studied. When using α‐SiC starting powder, the resulting microstructures contain hexagonal platelike α‐SiC grains with an average aspect…
The synthesis of surfactant-templated silicate materials has developed rapidly over the past decade. The uniform controlled pore sizes created in the amorphous silicate framework by this method show promise as catalyst supports, sensors, filtration membranes and in a variety of optoelectronic applications. Formation o…
Poly(methylmethacrylate) (PMMA), poly(2-hydroxyethyl methacrylate (PHEMA), and poly(2-hydroxypropyl methacrylate) (PHPMA) were modified to improve the wettability by two techniques: plasma and plasma source ion implantation. The modified surfaces were characterized to investigate the dependence of the modification and…
A block copolymer may be added as a compatibilizer during polymer processing in order to promote intimate mixing of thermodynamically immiscible homopolymers. The action of this compatibilizer can only partially be attributed to its effect on the interfacial tension between the immiscible homopolymers. Here the additi…
Abstract This contribution treats the fundamental and practical aspects of the analysis of interfaces between metals and ceramic materials. It is shown that, in principle at least, it is possible to assess the bond strength by investigating the atomic structure of the dislocation cores. We have chosen to exemplify our…
Chromium dioxide is a ferromagnetic metallic oxide utilized in data storage applications. Here, the XP spectrum of CrO2 bulk powder is compared to a CrO2(110) film grown on a TiO2(110) single crystal surface by chemical vapor deposition. The spectra compare the Cr 2p and O 1s regions for the two materials. In both mat…
A comparative refinement of the anharmonic and disordered models of the atomic structure was performed based on precision X-ray diffraction data sets collected from a CdTe single crystal at 295, 376, 491, and 583 K. Although both models provide the asymmetric contributions of Cd and Te to the structure factors, the an…
This paper presents numerical and experimental evaluations of the transient behavior of gas insulated substations (GIS). The electrical equivalent circuits chosen to represent the main components of GIS are implemented in the electro-magnetic transients program (EMTP). The effect of mutual couplings between phases are…
Abstract The rate constants for the thermal decompositions of CS2 and COS were investigated by measuring the time profiles of S atom using atomic resonance absorption spectroscopy behind the incident shock of CS2/Ar or COS/Ar mixtures, and the rate constants were determined to be k = (4.0 ± 0.1) × 1014 exp (−295 ± 20…