Materials Literature
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We report metalorganic vapor-phase epitaxial growth and structural and photoluminescent characteristics of ZnO nanorods. The nanorods were grown on Al2O3(00⋅1) substrates at 400 °C without employing any metal catalysts usually needed in other methods. Electron microscopy revealed that nanorods with uniform distributio…
Through chemical functionalization of single-walled carbon nanotubes, the prerequisites for possible applications of such nanostructures are established. The derivatized tubes differ from the crude materials in their good solubility, which enables both a more extensive characterization and subsequent chemical reactivi…
According to recent insights, the phytoplankton of the eastern Adriatic Sea is composed of 888 determined species. The diatoms were composed of 518 species (330 pennates, 176 centric diatoms), dinoflagellates 254, prymnesiophyceae101, chrysophyceae 2, raphidophyceae 1 and euglenophyceae 2 species. The list is accompan…
Abstract The solubility of diuron (3‐(3,4‐dichlorophenyl)‐1, 1 ‐dimethyl urea) and monuron (3‐(4‐chlorophenyl)‐1, 1 ‐dimethyl urea) in 49 and 43 different organic non‐electrolyte solvents, respectively, have been calculated. It was found that Modified UNIFAC described well the solubilities both in polar solvents like…
A região de Piraju -- SP é caracterizada geologicamente por apresentar uma grande distribuição de rochas básicas e ácidas da Formação Serra Geral. Os processos e produtos de alteração das rochas básicas são apresentados em muitos trabalhos, mas estudos envolvendo alteração de rochas vulcânicas ácidas são raros. Aprese…
A central nervous system disease occurred in a group of beef steers placed into confinement feeding pens during a period of prolonged drought and high environmental temperatures in Oklahoma, USA (September 2000). The steers began exhibiting neurological signs during the 3rd week after placement into the pens. Microsco…
Abstract A complete infrared study of the mixed crystal system of NaNO 3 and NaNO 2 is carried out in the region 600—3000 cm —1 at room temperature. The study includes fundamental internal normal vibrations of the NO — 2 and NO — 3 ions. The IR spectra, spectral band shape intensities, combination modes, and frequenci…
A produção de espumas cerâmicas através da aeração de suspensões associada ao processo "gelcasting" pode proporcionar cerâmicas porosas celulares com excelentes propriedades mecânicas, em uma ampla faixa de densidades. Entretanto, o uso deste material em aplicações específicas, como filtragem, isolamento térmico e sup…
Abstract Copper(II) complexes of 4-carboxyl-2,2,6,6,-tetramethyl-piperidinyloxy (Hcatempo) and 3-carboxy-2,2,5,5-tetramethyl-1-pyrrolidinyloxy (Hcaproxy), [Cu2(catempo)4(H2O)2] (1) and [Cu2(caproxy)4(H2O)2] (2), have been synthesized and characterized by X-ray crystallography, electronic spectroscopy and magnetic susc…
High‐purity zirconium tetrafluoride (ZrF 4 ) has been produced using sublimation and distillation techniques. The transition‐metal impurities have been determined in these purified samples, and it has been found that distillation is the preferred method of purification using a number of criteria. A detailed descriptio…
This paper outlines the history of clothing and modern textile production, from manual systems to modern line‐production systems, and notes that this has been affected by the mechanical properties of fabrics. It also focuses on the roles of textile scientists and the clothing industry to meet the needs of society.
Desized and scoured nylon 6 fabric is treated with liquid ammonia (NH 3 ) at -33.4°C. and the effects of the treatment on crystallinity, density, birefringence, DSC thermogram, moisture regain, water absorption, dyeability, and mechanical properties are investigated. The NH 3 treatment increases crystallinity and dens…
O desenvolvimento de microesferas de carbamazepina (CBZ) de liberação prolongada tem sido realizado, empregando-se a técnica de emulsificação/evaporação do solvente e o acetobutirato de celulose (ABC70) para a obtenção da matriz polimérica. Buscando modular a velocidade de liberação do fármaco, a adição de polietileno…
Aminoffite, (Ca2.95Mn0.08Pb0.01)(BeOH)2(Si2.95As0.03)O10, is tetragonal, P42/n, a 9.809(1), c 9.844(2) A, V 947.3(3) A 3 , Z = 12. The structure was refined to an R index of 2.9% based on 1265 observed (| Fo | > 5� F) reflections measured with a four-circle single-crystal diffractometer and MoKX-radiation. There are t…
We present a numerical scheme for the analysis of periodic dielectric waveguides using Floquet-Bloch theory. The problem of finding the fundamental propagation modes is reduced to a nonlinear eigenvalue problem involving Dirichlet-to-Neumann maps. This approach leads to much smaller matrix problems than the ones that…
Abstract In the second part of this study, the performance of phenol/phosphite/zinc stearate packages and the contribution of each additive to the long‐term thermal stabilization and photostabilization were evaluated in high‐density polyethylene produced by using Phillips catalyst technology. Infrared spectroscopy, ul…
Single phase α-Eu2GeS4 was prepared by oxidation of Eu2Ge with sulfur. Magnetic susceptibility measurements reveal Curie behavior with an experimental magnetic moment of 7.85(5) μB/Eu, compatible with divalent europium. Eu2GeS4 orders antiferromagnetically at TN = 5.0(5) K and undergoes a metamagnetic transition at a…
Anomalous dielectric relaxation behaviour is observed in the ferroelectric liquid crystalline polymer (viz. ferroelectric copolysiloxane (R)-COPS 11-10) around the ferroelectric SmC* to paraelectric SmA phase transition. Measurements have been performed on sample of thickness ∼10 μm in indium-tin-oxide coated cell in…
Various low molecular weight chitosans were prepared by oxidative degradation with H2O2, and characterized by IR,13C-NMR and gel permeation chromatography. Their carboxylic contents increased with decrease in molecular weight (M w ). The antitumor test of the samples against sarcoma 180 tumors suggested that the water…
Abstract An important aspect of the fibre-to-yarn production process is the quality and price of the resulting yarn. The yarn should have optimal product characteristics, while maintaining as low a price as possible. Early optimisation models of the fibre-to-yarn process, based on neural networks and genetic algorithm…