Materials Literature
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The piezoelectric properties of ferroelectric and antiferroelectric thin layers were investigated by interferometry as a function of frequency and dc electric bias. Materials included: a ferroelectric lead zirconate titanate (PZT) with a Zr/Ti ratio of 53/47; a relaxor ferroelectric La-modified PZT with a Zr/Ti ratio…
The α-phase crystal of 2-(2′,5′-dihydroxyphenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-1-oxy-3-oxide (α-HQNN), which consists of one-dimensional arrays formed by intra- and inter-molecular hydrogen bonds, showed a ferromagnetic phase transition at 0.5 K.
All articles of this category Natural clays can be modified into efficient and versatile catalysts for organic reactions. Among the assets of these heterogeneous catalysts are their lamellar swelling structure, their large specific surfaces, availability of both Brønsted- and Lewis-acidic catalytic sites, and their lo…
Polytetrafluoroethylene (PTFE) grafts placed into the arterial circulation of baboons for 8 weeks under high blood flow (HF) conditions develop a thin intima composed of smooth muscle cells (SMCs) and extracellular matrix beneath an endothelial monolayer. When these grafts are returned abruptly to normal flow (NF), th…
The light-emitting properties of rapid thermally oxidized porous Si are studied by both photoluminescence and cathodoluminescence methods. The structure of the material is examined by transmission electron microscopy, while its oxygen content is determined by x-ray microanalysis. These investigations show that crystal…
摘要 对冲击波法合成的纳米纤锌矿氮化硼（ｗＢＮ）进行了同步辐射真空紫外区的反射光谱测量，得到波长范围１００一２４０ｎｍ区间的反射光谱．利用Ｋｒａｍｅｒｓ－Ｋｒｏｎｉｇ关系计算获得了它的光学常数和介电函数谱，并导出了光电导谱．获得了纳米ｗＢＮ的光学禁带宽度实验值，为８．７±０．５ｅＶ．将以上结果和最新的理论计算进行了比较．观察到了经不同退火温度处理的纳米ｗＢＮ样品结构及尺寸变化对反射光谱和光学性质的影响． Abstract The reflectance spectrum of different wBN was measured. The sample were prepared by shock-wave method and…
The Tg's and heat capacity functions have been measured for a series of Na2S + B2S3 glasses for the first time. Unlike the alkali borates, Tg decreases rapidly as Na2S is added to B2S3. This effect, even in the presence of a rapidly increasing fraction of tetrahedrally coordinated borons, has been associated with the…
Abstract This article focuses on the mineral and organic acid cleaning of iron and steel. It begins with a discussion on the application methods, process selection criteria, solution composition, equipment used, and control of process variables in mineral acid cleaning. The article then describes the advantages and di…
The decay of the adsorbed superoxide radical anions in hydrogen in palladium-promoted yttria is accelerated when the content of palladium ions is increased. The decay kinetics are polyexponential and reflect the tunnelling mode of electron transfer (or electron tunnelling) to superoxide ions. Pd+ ions appearing during…
A method for the computation of environmental costs is described, using dynamic and static factors in a cumulative process to determine them for any stage in textile manufacture. The technique is dependent on an estimate of the projected lifetime of the earth, in conjunction with a value for the rate of consumption of…
A synthesis of 12-azaeburnane skeleton is described. The synthetic sequence has been successfully applied to the preparation of 12-aza analogue of the cerebral vasodilator, ethyl apovincaminate (Cavinton R ) and some related derivatives
This paper describes the synthesis of polymer hybrids between polyoxazoline and silica gel, in which the transition metal salts are incorporated. Organic-inorganic polymer hybrids were prepared by the acid-catalyzed sol-gel reaction of tetraethoxysilane in the presence of poly (2-methyl-2-oxazoline). To this system we…
The material design program has been developed for the Nd-Fe-B sintered magnets. This method enables to estimate the phase volume percent and magnetic properties. This program has been applied for the development of (BH)max=45MGOe with iHc=13kOe magnet and high energy product magnet. From the design of (BH)max=45MGOe…
Behavior of F and O on the Si(100) surfaces dipped in aqueous solution of HF was examined by use of X-ray photoelectron spectroscopy (XPS). The F 1 s spectrum observed was separated into two Gaussian peaks with 685.6eV and 687.4eV binding energies, which are considered to correspond to Si-F and Si-F2 bonding respectiv…
Crystals of Eu-(Gly-Gly-Gly).(H2O)5.(ClO4)3 are triclinic, spacegroup P1 with a = 9.123 (2), b = 11.185 (5), c = 11.426 (2) A; alpha = 90.79 (2), beta = 98.08 (1), gamma = 98.57 (2) degrees; Z = 2. The europium cation is surrounded by four oxygens from three different peptide units and four oxygens from water molecule…
Partially oxidized rhodium metal showed remarkable and stable activity for the partial oxidation of methane into synthesis gas by oxygen species trasported through Rh/YSZ/Ag under 1 atm and at a low temperature of 773 K.
It is wellknown that 6.5% Si steel has excellent soft magnetic properties, but high Si steel more than 4% Si are so brittle that it is impossible to manufacture thin gauge steel sheets using the conventional rolling process.Using the siliconizing method, we have succeeded in developing the world's first non-oriented 6…
Landau theory predicts significant differences between the ordering transitions in hexagonal close packed (hcp) and face centered cubic (fcc), based on symmetry arguments alone, even though it is possible with pairwise first and second neighbor interaction energies to assign identical energies to corresponding tetrahe…
Effect of fluoride ions on the pitting behavior of type 304 stainless steel has been studied in neutral chloride solutions at 303K. It has been confirmed by means of potentiodynamic polarization measurements that fluoride ions inhibit the chloride ion-induced pitting corrosion and promote the uniform dissolution of th…
A fatigue cut growth evaluation for thermoplastic polyurethanes is pre sented. The results from an experimental design study that included four different polyol types, the effect of the molecular weight of the polyol and three different urethane contents are discussed. The polycarbonate polyol showed the lowest fatigu…