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。
Abstract New troponoid liquid crystals with an electron-withdrawing cyano group at the C-5 position of tropolone and 2-aminotropone rings were prepared. Tropolone derivatives had nematic phases with lower thermal stabilities and smectic A phases with higher thermal stabilities than the corresponding benzenoids while t…
Silver films were deposited using direct current (dc) and midfrequency (MF) magnetron sputter deposition processes on floatglass in order to achieve maximum reflectivity over the entire visual and infrared spectral range. The films were investigated by means of ex situ and in situ spectroscopic ellipsometry, spectral…
For PbZrO3 and PbZr0.99Ti0.01O3 single crystals the first order Raman light scattering spectra in the paraelectric phase have been analysed. In lead zirconate two kinds of crystals, with and without a transient phase, were investigated. It was found that temperature dependence of the defect-induced soft mode frequency…
Abstract Differential scanning calorimetry (DSC), scanning electron microscopy (SEM) rheological, mechanical and impact tests were performed on alloys consisting of polycarbonate (PC) and diverse acrylonitrile‐butadiene‐styrene copolymers (ABS), from which different amounts of low molecular (M) weight (W) species had…
Using a series of clay based catalysts (KSF, KSF/0, KP10, K10, K0, KS), resorcinol is acylated in 1,2-dichloroethane by phenylacetyl chloride with a heterogeneous catalytic procedure. The yield of 1-(2,4-dihydroxyphenyl)-2-phenyl-ethanone is in correlation with the specific surface area of the catalyst.
OBJECTIVE: We determined the enhancement features of experimentally induced malignant tumors on MR imaging with the use of gadolinium mesoporphyrin, a recently developed MR contrast agent that may be necrosis-specific. MATERIALS AND METHODS: VX2 carcinoma was inoculated into 24 rabbit thighs. T1-weighted contrast-enha…
Abstract The understanding of the mechanisms of fatiguecrack propagation in advanced ceramics at elevated temperatures (>800°C) has in part been hampered by the experimental difficulty in directly measuring crack lengths, and hence crack growth rates, at such high temperatures. In this study, we show how the di…
In this paper, the dehydration behavior of hydrogen-methyl-siloxane-based porous spin-on-glass (SOG) films after oxygen plasma exposure is reported. The resultant loss of hydrophobic groups from the plasma exposure makes the films hygroscopic and thus the film dielectric constant can significantly increase. We employe…
Thermoreversible gels of the liquid-crystal LC-E7 with 1,3:2,4-Di-O-benzylidene-D-sorbitol (DBS) form white light-scattering films that are reversibly switchable to a clear state by ac electric fields. The light scattering by the gelled films is an intrinsic material property that originates in the phase diagram of th…
A pulse-based behavioral model is proposed and implemented in HSPICE. Hysteresis-loop and pulse measurement results are used to extract the model parameters. The model accurately predicts the bitline voltage of a ferroelectric memory testchip.
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTStraightforward Conversion Route to Nanocrystalline Monothiooxides of Rare Earths through a High-Temperature Colloid TechniqueYadong Li, Yu Huang, Tao Bai, and Longquan LiView Author Information Department of Chemistry, Tsinghua University, Beijing, 100084, P. R. China, and Dep…
We studied the origin of a green photoluminescence (PL) in silica glass at about 2.25 eV using electron spin resonance. The 2.25 eV PL band (lifetime: ∼300 ns, full width at half maximum: ∼0.2 eV) appears strong in γ-irradiated high-oxygen content silica glass suggesting that this PL is associated with a large surplus…
Laurence Barker, , Andreas Weise, Alexander Schulz, Christiane Gebhardt, Brigitte Hirner, Hanjo Hellmann, Waltraud Schulze, John M. Ward, Wolf B. Frommer, SUT2, a Putative Sucrose Sensor in Sieve Elements, The Plant Cell, Vol. 12, No. 7 (Jul., 2000), pp. 1153-1164
Tinplate is used widely in the canning industry. Its passivation treatment involves mainly the use of chromium, and it is applied typically with the cathodic dichromate (CDC) procedure. The present study provided evidence by means of laboratory testing in aerobic and anaerobic conditions that the combination of an acr…
High porosity nanocrystalline Si thin films have been deposited using a high density plasma approach at temperatures as low as 100 °C. These films exhibit the same unique properties, such as visible luminescence and gas sensitivity, that are seen in electrochemically etched Si (i.e., porous Si). The nanostructure cons…
Abstract Biodegradable edible films can be made from corn protein, α‐zein. Pure zein films are cast from an organic solution of α‐zein. This report outlines the surface conditions of such pure zein films. First, the transition temperature, T t′ of the pure zein film was measured with a thermomechanical analyzer. T t w…
The one-dimensional structure of catena-poly[[bis(2,2′-bipyridyl-1κ2N,N′)-μ-cyano-1:2κ2N:C-dicyano-2κ2C-dinickel(II)]-μ-cyano-C:N], [Ni2(CN)4(C10H8N2)2]n, consists of infinite zigzag chains running parallel to the c axis. The chains are composed of paramagnetic [Ni(bipy)2]2+ cations (bricks; nickel on a twofold a…
Kozoite-(Nd), Nd(CO 3 )(OH), occurs in cavities and fissures of alkali olivine basalt exposed at Niikoba, Hizen-cho, Higashi Matsuura-gun, Saga Prefecture, Japan, in association with lanthanite- (Nd) and kimuraite-(Y). The crystal structure was refined by the Rietveld method in space group Pmcn; a = 4.9829(1), b = 8.5…
Single crystals of BaTiO(3) were grown by templated grain growth (TGG). TGG involves contacting a single crystal "template" to a sintered polycrystalline matrix, then heating the assemblage to a temperature that promotes the migration of the single crystal boundary through the matrix. In this investigation the propert…
This paper presents how to determine the thickness of the hysteresis ring of hysteresis motor using the finite element method combined with a vector hysteresis model. From the magnitude and direction of the magnetic field intensity, the magnetization of each ring element is calculated by the vector hysteresis model an…