Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The effect o f low-temperature plasma treatment on the surface mod ificati on of cotton and polyester fabri cs has been in vestigated. T he experimental results show tlwt the method is useful in improv ing the wettability o f cotton and po lyester fabrics. The surface resistivity of cotton and polyester is dramaticall…
Various types of zinc oxide (ZnO) nanocrystais were synthesized by physical vaporization of zinc powders without the presence of catalysts and a subsequent exposure to air at a high temperature. These crystals were found to be composed of ZnO nanowires, sheets, and tetrapods. They were observed to crystallize as wurtz…
The study of the chemical composition of borate glasses obtained in graphite ampoules under pressures of 3 -7 GPa and at temperatures above 1700 K have shown the presence of a considerable (5-10 at.%) amount of calcium that enters the glass, most likely, from the pressure-transmitting medium.As a result, the physical…
Devido ao baixo custo de produção e excelente biodegradabilidade, o amido constitui-se em matéria-prima promissora para a produção de plásticos biodegradáveis. No entanto, a grande hidrofilicidade dos filmes à base de amido representa uma séria limitação tecnológica à sua comercialização, uma vez que as propriedades d…
A numerical method for calculation of the power losses of nonlinear laminated ferromagnetic cores is presented. The calculation is made in two subsequent steps. In the first step, the approximate magnetic field distribution in the material is determined assuming a nonlaminated bulk nonlinear ferromagnetic material wit…
This paper presents a methodology for a convenient modification of induction motor equivalent circuit parameters, taking into consideration switching frequency iron losses in case of inverter supply. The method is based on the determination of harmonic iron losses in laminated iron cores under nonsinusoidal excitation…
High temperature corrosion of structural alloys in sulfur bearing environments is many orders of magnitude higher than in oxidizing environments. Efforts to increase sulfidation resistance of these alloys include addition of alloying elements. Aluminum additions to iron-chromium alloys bring about increase in sulfidat…
Abstract Filamentous zygnematalean algae frequently dominate periphyton assemblages in New Zealand streams, yet only 10 reliable species records of the most common genera, Spirogyra and Zygnema, exist. One of these species, S. clavata, was found again in a new survey of stream habitats, mainly in the South Island. Ten…
Over the past years, research has attempted to relate fiber properties with yarn prop erties, and many regression equations have been developed to accomplish this. The complexities of multiple regression equations put limits on their universal acceptance. Neural networks with better nonlinear mapping have also been us…
The pressure inside an enclosed void in a solid dielectric is generally determined by calculation based on equating the measured partial discharge (PD) onset voltage and the breakdown voltage from the Paschen curve for a particular gas. Here it is assumed that the gas is known or that physical properties remain approx…
Abstract Switchable binary polymer brushes grafted to Si‐wafers were prepared from hydrophilic and hydrophobic polymer components. When exposed to solvents, either the hydrophobic or the hydrophilic component extends in to the liquid phase, depending on the polarity of the solvent. The hydrophilic component was poly‐2…
Abstract Summary: Controlled polymerization of styrene in toluene was achieved by atom transfer radical polymerization (ATRP) using hyperbranched polyglycidol‐supported multidentate amine ligands/Cu I Br catalyst systems. These catalyst systems with nanoscopic dimensions were more active than the corresponding low‐mol…
Single-crystalline wurtzite ZnS nanobelts were synthesized by the VPT process for the first time in the presence of Au catalyst on the Si substrates. Each ZnS nanobelt is fairly straight. The ZnS nanobelts are 50–100 µm in length, 150–600 nm in width and 3–10 in ratio of the width to the thickness. The crystalline dir…
x SnO–(100 – x ) P 2 O 5 glasses (0.30 ≤ x ≤ 0.75) were prepared under argon atmosphere. The Sn 2+ /Sn total ratio, determined by wet chemical analysis, varies from 90 to 99% depending on glass composition. Glass transition temperatures are very low, and no effect of Sn 4+ could be detected. Glass structure was charac…
Abstract A new class of thermosensitive polymers based on polyethers is discussed. Using living anionic polymerisation techniques a series of homo‐ and block copolymers of 2,3‐epoxypropanol‐1 (the glycidol), ethoxy ethyl glycidol ether, its hydrophobic derivative, and ethylene oxide of different molar masses and topol…
There are a number of studies that explain the metabolism and roles of metallic titanium and titaniumion. One of the most intriguing results from these studies is the finding of metallic titanium having no bacteriostatic effects on oral bacterial species. In this research, the effects of titanium-ion on the growth of…
Two sedimentary profiles, at 18 km and at 125 km from the Rhone River mouth were selected to study the steps of glauconitization inside green (glaucony) grains, in a temperate marine environment. The proximal site is characterized by a greater content of alpine minerals (chlorite, illite) than the distal one. In the p…
Abstract Summary: A new kind of aniline oligomer with a “dumbbell” shape was synthesized through a simple oxidative coupling reaction with a new rigid aromatic amine as starting material. The oligomer was characterized with mass spectrometry, IR and NMR spectroscopies. Its redox property was checked by cyclic voltamme…
In this work the temperature dependence of the extraordinary/ordinary refractive indices and the optical birefringence are determined near the reentrant isotropic–discotic nematic–isotropic phase transitions for a lyotropic mixture of potassium laurate, decanol and D2O. These parameters are related to the extraordinar…
Several pillared clays were prepared by using a polyalcohol (ethylene glycol or poly(vinyl alcohol)) or a poly(ethylene oxide) surfactant as an interlayer gallery template and an aluminum oligomer species as the pillaring agent. The use of polyalcohols or nonionic surfactants, such as Tergitol, gave materials which, i…