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。
The detailed emission and excitation spectra and the temperature dependence of the excitation efficiency are obtained for MgS:Cu + , CaS:Cu + , SrS:Cu + and BaS:Cu + at various temperatures between 16 and 293 K. In the excitation spectra of all the powder phosphors, two bands assigned to the intraionic transitions in…
The temperature dependence of the order parameters in quartz, NaNO3, Mo8O23 show saturation behaviour with characteristic saturation temperatures θ. The quantitative behaviour is in good agreement with the predictions of Salje, Wruck and Thomas (1991) for both displacive (eg. quartz) and order/disorder systems (eg. Na…
The interaction of atomic and molecular hydrogen with the (0001) surface of magnesium has been studied using EELS, TDS, work-function measurements, and core-level spectroscopy. No evidence for molecular or dissociative adsorption of H2 is observed at the substrate temperature investigated (>110 K, atomic hydrogen is b…
The crystal structure of a proteolytically modified form of the Escherichia coli phosphocarrier and signal transducing protein IIIglc has been determined by multiple isomorphous and molecular replacement. The model has been refined to an R-factor of 0.166 for data between 6- and 2.1-A resolution with an rms deviation…
Microscopic theory of smectic ordering in melts of rod-coil copolymers is proposed. It is shown that a second-order phase transition nematic-smectic A or a first-order transition nematic-smectic C may occur in the system as Flory's parameter of incompatibility of the blocks, x is increased. A number of phase transitio…
Abstract High-pressure resistivity studies on [(CH3)4N][Pd(dmit)2]2 have revealed the system to be a new molecular superconductor. The superconducting transition has been observed above 6 kbar. The mid-point transition temperature T is 6.2 K at 6.5 kbar. The crystal has the structure almost isomorphous to the high-pre…
Eight types of two- and three-ring liquid-crystalline compounds each possessing a 3,4-difluorophenyl substituent were synthesized. Their liquid-crystalline mixtures were such as to make them useful for active matrix displays, such as TFT (thin-film-transistor) and MIM (metal-insuiator-metal) systems. They have high st…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoproduction of gold colloids and filmsR. Krasnansky, S. Yamamura, J. K. Thomas, and R. DellaguardiaCite this: Langmuir 1991, 7, 12, 2881–2886Publication Date (Print):December 1, 1991Publication History Published online1 May 2002Published inissue 1 December 1991https://do…
Article Elektrochemische Korrosionsuntersuchungen an gasoxinitriertem und salzbadnitrocarburiertem Stahl in Abhängigkeit vom Aufbau der Nitrierschicht was published on December 1, 1991 in the journal HTM Journal of Heat Treatment and Materials (volume 46, issue 6).
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of acid concentration and other reaction parameters on epoxidation of natural rubber latexSanjoy Roy, B. R. Gupta, and B. R. MaitiCite this: Ind. Eng. Chem. Res. 1991, 30, 12, 2573–2576Publication Date (Print):December 1, 1991Publication History Published online1 May…
Solutions of polystyrene in toluene in the concentration range 0.1–1.0 g/ml have been examined using polarized Rayleigh–Brillouin scattering and dynamic light scattering. The purpose was to extend measurements to the hitherto little studied interval between semidilute solutions and the bulk polymer. The Brillouin shif…
Single crystals of mixed methyl-(2,4-dinitrophenyl)-aminopropanoate (MAP): 2-methyl-4-nitroaniline (MNA) have been grown from solution using a 40:60 mixture of ethanol and ethyl acetate. Formation of an equimolar complex is confirmed by x-ray diffraction studies. The complex crystallizes in the monoclinic space group…
A detailed morphological comparison between the narrow-spiked and the wide-spiked variants of Triticum dicoccoides growing in Israel revealed significant differences that became evident in almost all organs, both vegetative and reproductive, in juvenile and adult stages, on macro- and micro-morphological levels. Pheno…
With a view to evaluate the effect of non-mesogen or mesogen on the binary systems comprised of a nematogon or a polymesomorph, the present study was undertaken where the compounds have general structure (I): The binary systems are selected with variation in R and R′ (I). The binary phase diagrams have very interestin…
A process, which makes it possible for polyimide resists to be developed using dilute base aqueous solutions, is reported. The process contains soft bake, UV exposure, post exposure bake and development with basic aqueous solutions. The post exposure bake at a temperature range from 140 to 160°C, which is higher than…
Lys-258 of aspartate aminotransferase forms a Schiff base with pyridoxal phosphate and is responsible for catalysis of the 1,3-prototropic shift central to the transamination reaction sequence. Substitution of arginine for Lys-258 stabilizes the otherwise elusive quinonoid intermediate, as assessed by the long wavelen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCluster synthesis. 36. New platinum-ruthenium and platinum-osmium carbonyl cluster complexes from the reactions of the complexes Pt2M4(CO)18 (M = ruthenium, osmium) with cycloocta-1,5-diene in the presence of UV irradiationRichard D. Adams, Michael S. Alexander, Isam Arafa,…
A unified treatment of effective-medium theory for the dielectric constant and conductivity of a macroscopically inhomogeneous medium based on renormalization is presented. Our expression recovers in appropriate limits Bruggeman's unsymmetrical as well as symmetrical results. In addition, the same expression also desc…
Abstract Crystal data and results of structure refinements for MnSi are reported. The material is cubic, P2 1 3, with a = 4.5603(2) Å, V d = 94.84(1) Å 3 , Z = 4, D x = 5.815 Mg/m 3 . Intensity data were obtained from a Stoe transmission type diffractometer equipped with a position sensitive detector. CuKα 1 radiation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and polymerization of N-(4-vinylphenyl)maleimideTokio Hagiwara, Iwao Suzuki, Kazushi Takeuchi, Hiroshi Hamana, and Tadashi NaritaCite this: Macromolecules 1991, 24, 26, 6856–6858Publication Date (Print):December 1, 1991Publication History Published online1 May 2002…