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。
We demonstrate how the mathematical treatment of the switching current data allows to characterize the variation of the domain structure during fatigue. Investigating PZT/YBCO heterostructures on SrTiO3 and NdGaO3 substrates we propose two different scenarios of fatigue-induced evolution of the domain structure. The e…
The magneto-thermoelectric power (TEP) $\ensuremath{\Delta}S(T,H)$ of perovskite-type manganese oxide ${\mathrm{La}}_{0.6}{\mathrm{Y}}_{0.1}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ is found to exhibit a sharp peak at some temperature ${T}^{*}=170 \mathrm{K}.$ By approximating the true shape of the measured magneto-TEP i…
Graphite has normally been used to synthesise fullerenes and nanotubes. However, coal is a cheaper and more suitable industrial material. Because coal is a molecular solid, unlike graphite, the mechanism by which fullerene and nanotubes are formed is different. Moreover, other products such as polyaromatic hydrocarbon…
Abstract The tensile strengths, σ b , and apparent fracture energies, G , of edge-cut strip specimens (28 mm wide) of carbon black-filled vulcanizates of natural rubber (NR), cis -butadiene rubber ( cis -BR), and a 50/50 blend have been determined. The BR vulcanizate exhibited a rather steady decrease in σ b with incr…
A ferroelectric phase transition is observed in Langmuir-Blodgett films prepared from substituted copper phthalocyanine molecules. The linear and nonlinear dielectric properties of the films and the switching of their spontaneous polarization are investigated in the temperature range of the phase transition. The obser…
KDN (2-keto-3-deoxy-D-glycero-D-galacto-nononic acid), a sialic acid analog, has been found to be widely distributed in nature. Despite the structural similarity between KDN and Neu5Ac, alpha-ketosides of KDN are refractory to conventional sialidases. We found that the hepatopancreas of the oyster, Crassostrea virgini…
The stability of the aromatic phase of two-dimensional monolayers of BN, C, Si, GaAs, and SiC is theoretically investigated using an ab initio tight-binding-like method. It is found that BN, C, and SiC prefer to form the flat aromatic phase while Si and GaAs prefer to pucker, although Si is found to be a borderline ca…
Quality Rescrurm, 902 Broadway, New York, NY 1001 0,800/24 7-851 9,1998,287 pages, $24.95, ISBN 0527-7634-3
X-ray diffraction studies of ammonium myristate and palmitate show crystals that belong to space group P 2 1 / n with the methylene groups packing in a triclinic subcell. The infrared spectra of the palmitate and stearate are similar as expected, but the bands of the myristate salt show additional splitting in the met…
A new series of N 2 O tridentate ligands HL n ( n = 2−5) have been prepared through N -methylation or N -benzylation of 2- N -(2-pyridylmethyl)aminophenol (HL 1 ). Treatment of these ligands with WO 2 Cl 2 (DME) (DME = 1,2-dimethoxyethane) in the presence of triethylamine leads to the formation of cis -dioxotungsten(V…
This paper presents a characterization study of the microstructural evolution of various carbon fibre-reinforced polycarbosilane (PCS)-derived SiC matrix composites during high temperature heat treatment. Both surface-treated and untreated carbon fibre reinforcements were investigated. The STEM/EELS technique was foun…
The crystallization of stoichiometric barium osumilite (BaMg 2 Al 6 Si 9 O 30 ) glass manufactured by melting or by sol‐gel processing using an all‐alkoxide route (AAR) or a partial‐alkoxide route (PAR) using mixed alkoxides and salts has been characterized by thermal methods, phase analysis, and microstructural analy…
The polymer composites of HDPE and banana, hemp, and agave fibers (50 : 50, w/w) were prepared separately with and without treatment of maleic anhydride. The swelling phenomenon in terms of absorption of water and steam was studied and it was found that the steam penetrates more within a smaller period of time than th…
An experiment is described in which polystyrene films containing various levels of plasticizers are prepared by solution-casting onto steel test panels. These films are subsequently tested for hardness using a pencil hardness technique, impact resistance using a drop weight test, and glass transition temperature using…
Discontinuous translational elongation of polypeptides is observed during spider dragline silk fibroin synthesis (1,2). The repeating segment of one of the two subunit proteins constituting spider major ampullate (dragline) silk of Nephila clavipes, Spidroin 2, consists of alternate alanine-rich and proline-rich regio…
First-principles quantum chemical techniques on cluster models have been used to investigate the photoabsorption of the peroxide linkage defect in silicate glasses. The effects of geometry, basis sets, and cluster size have been considered carefully to derive converged values for the low-lying excitation energies. The…
The optimization of the InP liquid encapsulated Czochralski systems is usually difficult, time consuming and very expensive. Here, the relative importance of the different growth parameters (e.g., pull rate, system temperatures and geometry) on the growth interface deflection, the temperature gradients within the melt…
The effects of salinity on the incidence of pseudo-auxospore formation and the size of initial cells were examined at 15, 20, 25, 30, and 35PSU (Practical Salinity Unit) during vegetative cell enlargement of the giant diatom Coscinodiscus wailesii Gran grown in culture. Mean percentages of pseudo-auxospore formation r…
ABSTRACT The influence of starch addition on the elastic properties of fish‐meat gel was studied by measuring compression and stress relaxation properties and dynamic viscoelasticity. Samples with pregelatinized starch, with and without raw starch, and processed starch were used. Fish‐meat gels with starch showed a hi…
ABSTRACT Edible coating formulations were made with food‐grade polyvinyl acetate (PVA) dissolved in alcohol‐water mixtures. PVA coatings had high gloss and relatively high permeance to O 2 and water vapor, and they formed glossy surfaces on chocolate candy, citrus fruit, and apples. Addition of propylene glycol helped…