Materials Literature
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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…
The degree of colour shift depending on viewing direction in the in‐plane switching (IPS) mode has been investigated. The IPS cell with pure twist deformation exhibits a stronger colour shift than that of the IPS cell with tilt as well as twist deformation, although the former has better luminance uniformity in the br…
Densely packed and well-aligned coaxial (core-shell) CdS-CdO and ZnS-ZnO nanorod arrays were prepared with a one-step, non-catalytic, template-free metalorganic chemical vapour deposition (MOCVD) process by using single-source molecular precursors Cd(O-EtXan)(2) and Zn(O-EtXan)(2), respectively (O-EtXan = S(2)COCH(2)C…
A novel controlled drug delivery system was fabricated by coating chitosan/PAA multilayer onto magnetic hollow spheres via a "Layer-by-Layer" (LBL) assembly approach. Cefradine was used as a model drug to evaluate the drug release characteristics of this core-shell hollow structure and the results show that it exhibit…
The authors have fabricated thin films of alpha tantalum (α-Ta) with crystalline and amorphous structures by nonequilibrium pulsed laser deposition techniques, and compared their electrical properties and diffusion characteristics with those of polycrystalline beta tantalum (β-Ta) films produced by magnetron sputterin…
A polymer dispersion consisting of soft latex spheres with a diameter of 135 nm was used to produce a crystalline film with face-centered cubic (fcc) packing of the spheres. Different from conventional small-molecule and hard-sphere colloidal crystals, the crystalline latex film in the present case is soft (i.e., easi…
A utilização de polímeros bioreabsorvíveis na área médica tem aumentado a cada ano. Dentre os polímeros bioreabsorvíveis mais estudados, encontra-se o poli (L-ácido láctico-co-ácido glicólico), PLGA, cuja principal característica é apresentar curto tempo de degradação e por isso, aplicado como suturas, dispositivos pa…