Materials Literature
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The deformation and strength characteristics, as well as rheological properties and biodegradability of film materials prepared by hot pressing and slot extrusion methods from polyethylene-plasticized starch-compatibilizer blends were examined. Polyethylene with grafted itaconic acid served as compatibilizer. The form…
Short fibre reinforced composites were made from keratin fibres obtained from poultry feathers. The matrix material was either polypropylene or a blend of polypropylene and maleic anhydride modified polypropylene (MaPP). In general, the addition of MaPP to polypropylene (PP) did not alter the tensile properties of the…
The temperature dependences of internal friction (ultrasound decrement) and impact toughness of bcc metals (Fe-12Cr-W-V-Ta-B-C ferritic/martensitic steel, V-4Ti-4Cr vanadium-based alloy) have been studied in a temperature range from 100 to 300 K. The acoustic and mechanical characteristics exhibit correlated variation…
SUMMARY The present study clarifies the fine structure of the vegetative frustules, initial valves and perizonium of Achnanthes crenulata Grunow. The valves of the vegetative cell are distinctly linear‐lanceolate with an undulate margin. The valve face is quite flat and in girdle view is smoothly curved as in species…
Dielectric behavior on BaTiO3∕SrTiO3 artificial lattices has been investigated along with quantum mechanical simulation (first principles calculation). From the oxide artificial lattice approach, strain manipulation was performed to obtain a wide range of lattice deformation in the consisting BaTiO3 and SrTiO3 layers,…
The dielectric relaxation spectrum over the frequency range 102 to 1.8×109 Hz of 4‐octyl‐4′‐cyanobiphenyl, 8CB, in bulk and confined to 200 nm diameter cylindrical pores is reported. We used matrices with parallel cylindrical pores, obtaining different alignments of the molecular director depending on the treatment. R…
The Chlorophyceae are a large and important group of green algae. They include some of the most common species, as well as many members that are important both ecologically and scientifically. When abundant in the water, they can rapidly cover the surface of sand filters and drastically reduce the length of filter run…
S.L. Jeon and E. Hegewald. 2006. A revision of the species Desmodesmus perforatus and D. tropicus (Scenedesmaceae, Chlorophyceae, Chlorophyta). Phycologia 45: 567–584. DOI: 10.2216/05-63.1We have made a synopsis of the morphology, ultrastructure, taxonomy, distribution and genetics of two widely distributed but little…
Degradation of nanofibers made from organic molecules such as para-hexaphenylene or functionalized quaterphenylene via photoexcitation or thermal irradiation is investigated by optical and morphological studies. Under ambient air conditions and in the limit of strong excitation, the degradation of luminescence intensi…
Prolonged scale inhibition in excess of one year is a desirable benefit of oil and gas well formation squeeze treatments. Traditionally liquid inhibitors have given the requisite inhibitor residual for up to one year. Operators desire longer inhibition periods. This paper describes a new scale inhibitor technology tha…
The stress potential function theory for plane elasticity of icosahedral quasicrystals is developed. By introducing stress functions, huge numbers of basic equations involving elasticity of icosahedral quasicrystals are reduced to a single partial differential equation of the 12th order. The general solution of the eq…
For the [111] oriented barium titanate (BaTiO3) single crystals, the patterning electrode was used to induce the finer engineered domain configurations with domain size below 5 μ m. The poling treatment was performed at 134.0°C under electric fields below 6 kV/cm to inhibit the burning of the patterning electrode with…
An X-ray source based on a field-emission electron source is currently being developed using carbon nanotubes (CNTs) for applications to biological, medical and material technologies. In the design of triode-type X-ray sources, it is important to ensure that fine beam focus and efficient electron emission can be simul…
It was proposed that large dielectric constants in Pb(Zn 1/3 Nb 2/3 )O 3 – x PbTiO 3 (PZN– x PT) crystals are mainly due to the fluctuation of polarization along the spherical direction (perpendicular to the spontaneous polarization) near the morphotropic phase boundary (MPB), named transversal instability [M. Iwata a…
Abstract A series of conjugated copolymers containing perylene, porphyrin, and/or fullerene units on the main chain have been synthesized. The structures and photophysical properties of polymers were characterized by FTIR, NMR, UV–vis, and fluorescence spectroscopy, gel permeation chromatography, and cyclic voltammetr…
Abstract Dihydroxo- and dimethoxo(tetraphenylporphyrinato)phosphorus(V) complexes ([P(OR)2tpp]+) were immobilized on silica-gel powder affording a visible-light driven photocatalyst ([P(OR)2tpp]/SiO2; 1). Bactericidal effect of complexes 1a (R = H) and 1b (R = Me) on Escherichia coli were investigated under visible-li…
The ultra high-lime with aluminum process (UHLA) has the ability to remove sulfate and chloride in addition to other scale-forming materials from recycled cooling water. Laboratory experiments have demonstrated that the UHLA process can achieve high chloride removal from recycled cooling water, and an equilibrium mode…
Abstract Three cobalt(II) complexes, [Co(X)2(4NOpy)4] (X = NCO−, NCS−, and Br−; 4NOpy = 4-(N-tert-butylaminoxyl)pyridine) were prepared, and their molecular structures were characterized by X-ray structure analysis. The molecular geometry of [Co(X)2(4NOpy)4] (X = NCO− and NCS−) is a compressed octahedron, in which the…
A lasing condition is formulated in matrix form for optically anisotropic thin films. Lasing behavior of liquid-crystal slabs is analyzed. In particular, it is shown that if the spatial extent of a liquid crystal slab is much larger than its thickness, then laser emission is feasible not only along the normal to the s…
Purpose To study the effect of concentration, voltage, take‐over distance and diameter of pinhead, etc. on precursory poly(phenylene vinylene) (PPV) electrospinning, in order to improve uniformity and achieve desired ultra‐fibre. Design/methodology/approach Various ultra‐fibres were prepared under different conditions…