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。
This article reviews the body of work aimed at elucidating the mechanisms of action by which natural products of plant origin exert a vasodilatory effect at the level of the vasculature. The search was restricted to 4 mechanisms: the nitric oxide system and (or) reactive oxygen species, the eicosanoid system, potassiu…
In the present study, we describe the features of programmed cell death of the ovarian nurse cells occurring during vitellogenesis of the silkmoth Bombyx mori. At developmental stage 5, the nurse cells occupy one-half of the follicular volume and obtain a rather spherical shape, while the nurse cell nuclei appear larg…
For the purpose of the developing Pb-free piezoelectric ceramics, the dielectric and piezoelectric properties of two series of KNbO 3 –NaNbO 3 –LiNbO 3 –SrTiO 3 (KN–NN–LN–ST) perovskite ceramics, namely 0.47KN–0.47NN–(0.06- x )LN– x ST (0≤ x ≤0.06) and 0.45KN–0.45NN–(0.10- y )LN– y ST (0.02≤ y ≤0.10) were investigated…
The identification of biological reference conditions specific to each type of water body is essential for the development of sound biological indicators and criteria. The purpose of the present study was to establish the reference conditions of each stream type sampled in southern Québec (Canada) using benthic diatom…
Abstract A new class of thermosetting poly(2,6‐dimethyl‐1,4‐phenylene oxide)s containing pendant epoxide groups were synthesized and characterized. These new epoxy polymers were prepared through the bromination of poly(2,6‐dimethyl‐1,4‐phenylene oxide) in halogenated aromatic hydrocarbons followed by a Wittig reaction…
We present a method for electromechanical characterization of carbon nanotube (CNT) films grown on silicon substrates as potential electrical contacts. The method includes measuring the sheet resistance of a tangled CNT film, measuring the contact resistance between two tangled CNT films, and investigating the depende…
The thermoelectric properties of a nonstoichiometric titanium oxide (TiO 1.1 ) are investigated in terms of materials for high-temperature thermoelectric conversion. The electrical conductivity σ of TiO 1.1 increases to 9000 S/m at 800 °C showing semiconducting behavior. The Seebeck coefficient α of TiO 1.1 shows a ge…
Phthalocyanines are an interesting class of aromatic macrocycles which possess unique physical and chemical properties that make them excellent building blocks for the construction of molecular materials. Among the different functional groups that can be incorporated into the phthalocyanine's skeleton, the alkynyl gro…
Ag1-xSnSb1+xTe3 presents a rare combination of large positive thermoelectric power response coexisting with an almost metallic carrier concentration. It is proposed that this unusual state arises from a high effective mass for the hole carriers which may derive from nanostructuring in the material.
Highly transparent and conductive thin films of SnO2:F and In2O3:Sn (ITO) have been prepared on glass substrates using the simple pyrolitic (spray) method. Through an exhaustive parameter study and using as diagnostic method for the film quality a figure of merit defined as a function of both, the transmittance and th…
Abstract Brazil is a significant producer of kaolin with almost 2.5 Mt in 2005 representing 10% of the world's total of 25.0 Mt. Brazil is now the second largest producer in the world, after the USA, having overtaken the United Kingdom in 2005. The kaolin resources are widespread throughout the country and are varied…
With increasing interest in nanotechnology, development of nanofibers (n-fibers) by using the technique of electrospinning is gaining new momentum. Among important potential applications of n-fiber-based structures, scaffolds for tissue-engineering represent an advancing front. Nanoscaffolds (n-scaffolds) are closer t…
Electrospinning is a method utilized to produce nano-scale fibers for tissue engineering applications. A variety of cells are attracted by nano scale surfaces and structures probably due to the similarity of their natural environment scale. In this study, diclofenac sodium (DS) releasing nanofibers were manufactured v…
When assembling planar solid oxide fuel cell (SOFC) stacks, an electrically insulating and gas-tight sealing material is required. Glass-ceramic sealants have been shown to be an appropriate material for this application in the past. In the present study, the investigations are focused on a composite material consisti…
Abstract The progress that has been achieved over the past few years on the growth of thick and high purity homo‐epitaxial single crystal diamond by chemical vapour deposition (CVD) has opened a wide range of possible applications in areas such as optics or power electronics. Recently, high quality single crystals wer…
The microstructure of the SmCo5 thin films sputter deposited on Cu underlayers was investigated to explain the high coercivity Hc. Energy filtered elemental map and energy dispersive x-ray spectroscopy line analysis showed that Cu diffused into the SmCo5 layer to form a Sm(Co,Cu)5 solid solution. Composition fluctuati…
We report the synthesis, characterization, and thermal behavior of 1,1-diethyl-3-(4-(3,3-diethylthioureidocarbonyl)benzoyl)thiourea, 1,1-di- n -propyl-3-(4-(3,3-di- n -propylthioureido carbonyl)benzoyl)thiourea and 1,1-di- n -butyl-3-(4-(3,3-di- n -butylthioureidocarbonyl)benzoyl)thiourea and their Ni(II), Cu(II), and…
Free amine chitooligosaccharides (FACOS, Kitto Life, Seoul, Republic of Korea) with an average molecular mass of 3.5 kDa were efficiently produced using an ultrafiltration membrane reactor system. To evaluate the effect of chitooligosaccharides on serum cytokine levels in elderly adults after oral intake, 5.1 g/day of…
DyMnO 3 single crystals of hexagonal modification were grown for the first time by zone melting, and their anisotropic magnetic properties were studied in detail. At T ∼ 7 K, a small uncompensated magnetic moment (∼1 μ B per formula unit) is shown to occur along the hexagonal axis. At temperatures 7–45 K, a transition…
Highly active and selective titania−silica epoxidation catalysts modified by MeSiO1.5 and Me3SiO0.5 groups were obtained in one step by a nonhydrolytic sol−gel process using low-cost chloride precursors and routine evaporative drying.