Materials Literature
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The effects of doping with multiple impurities on the electromechanical properties of lead zirconate-titanate ceramics have been investigated from the viewpoint of the internal bias field. The internal bias field is strengthened by doping with the multiple acceptors K and Fe, but weakened by the multiple donors La and…
Abstract The evaporation of metallic gold into an ethanolic solution of bis(diphenylphosphino)‐methane (dppmH) and NH 4 NO 3 results in the formation of [Au 5 (dppmH) 3 (dppm)](NO 3 ) 2 with (dppm) = [Ph 2 PCHPPh 2 ] − ; an X‐Ray structure analysis revealed the presence of a Au‐C bond. Full physical data, including 19…
The lack of suitable materials having permeabilities (μr) greater than unity at microwave frequencies has previously made it difficult to design thin coatings of broadband radar absorbersat this frequency range. A possible solution is to utilize the hexagonal ferrites that exhibit significant μrvalues (̃5) over narrow…
Conference International Symposium on Polyvinylchloride, Third, Cleveland, Ohio, USA, 1980-08-10–1980-08-15 Published Online: 2009-01-01 Published in Print: 1981-01-01 © 2013 Walter de Gruyter GmbH, Berlin/Boston
Several kinds of the stretched polymer films, such as those of cellulose, polyvinylalcohol, and polyethylene are shown to have aligning capability for nematic liquid crystals (a mixture of cyanobiphenyls) in the direction of the stretching when the films are stretched over about 100%. Among them polyethylene is only o…
The interaction of H2+ CO2 has been investigated on Rh dispersed on MgO, TiO2, SiO2 and Al2O3 supports. The adsorption measurements revealed that, with the exception of Rh/SiO2, the presence of H2 greatly enhances the uptake of CO2 by Rh samples at 373 K. I.r. spectroscopic measurements showed that adsorbed CO and for…
The principles, advantages, and implementations of scanning reference electrode techniques are reviewed. The technique locates the position of localized corrosion, and can be used to monitor the development of corrosion and changes in the corrosion rate under a wide range of conditions. Data related to pitting, interg…
Pharmacologic responsiveness of the eccrine sweat gland has never been studied under well-defined in vitro experimental conditions. Using isolated cannulated single monkey palm eccrine sweat glands, the dose response to both cholinergic and alpha- and beta-adrenergic agents and the effects of various antagonists on ag…
The amount and dynamic behaviour of adsorbed hydrocarbon species formed during the reaction of H2+ CO on Ru/SiO2 were measured by the in situ infrared spectroscopic technique using Fourier-transform methods; the average chain length (the CH2/CH3 ratio), and the dependences of the rate of accumulation of such hydrocarb…
Eight modes of the guest-host cells (GH-cells), in which types of dye, liquid crystal and their alignments are adequately combined, are surveyed, and the color contrast of each mode is calculated. Three modes among them are of positive type display, that is, colored patterns on the colorless background contrary to the…
Zirconolite (CaZrTi2O7) and perovskite (CaTiO3) are key minerals in SYNROC, a ceramic material developed for the immobilization of high level nuclear reactor wastes. When these are incorporated in SYNROC, the long-lived radioactive actinide elements are preferentially partitioned into zirconolite and perovskite which…
By using an evaporated silver film that has a continuously varying thickness, we have demonstrated the dependence of surface-enhanced Raman scattering (SERS) on the dielectric properties of the film. These results support local field models that are based on metal-particle resonances for SERS.
Abstract Simple algebra is sufficient to show that all the commonly accepted, empirical susceptibility relationships exhibit power laws as functions of frequency, in the limits of both low and high frequencies. The exponents of these power law relationships are presented and it is shown that simple relationships exist…
The flow of carbon in vivo from glucose to cellulose in developing cotton fibers which were actively engaged in the deposition of a cellulosic secondary cell wall was traced. Steady state levels of nucleotide sugars were analyzed from developing cotton fibers harvested between 13 and 36 days post-anthesis (DPA). The U…
The title compound (6) undergoes photochemical conrotatory and thermal disrotatory ring-closure to give red 7,7a-dihydro-4,7,7-trimethylbenzo[b]furan-5,6-dicarboxylic anhydride (7,7a-DHBF)(8) in near quantitative yield. The latter ring-opens in a conrotatory mode to the title compound on exposure to white light, and s…
The electrochemistry and photoelectrochemistry of a (110) face of single-crystal lithiated NiO has been studied. The Mott–Schottky and photocurrent appearance potential suggest a flat-band potential of +0.8 V (NHE), and earlier capacitance data are used to fix a second acceptor level at +0.4 eV above the Li acceptor s…
A Monte Carlo method is used to calculate the threshold of percolation of holes between overlapping spheres. At the critical volume fraction, 0.966 ± 0.007, corresponding to a dimensionless density of 0.81 ± 0.05 localization in the Lorentz model appears.
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A review is presented of the use of impedance techniques in corrosion science. Emphasis is placed on defining the type of data that is required in corrosion studies, and then comparing different methods for generating the required information by electrochemical impedance methods. The performance characteristics of the…
AlNの焼結に及ぼす各種添加物の影響を30種の添加物を用いて検討した. その結果, 添加物の内アルカリ土類属又は希土類酸化物がAlNとの相反応により窒素を含むアルミネート相を生成し, これがAlNのち密化を促進して理論密度焼結を達成することが確認された. 焼結体の微細組織は上記のち密化が液相焼結に起因していることを示した. 一方Si化合物はAlNポリタイプのようなより耐熱性の高い化合物を生成しち密化を阻害した.