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。
Vinyl chloride-based homo- and copolymers are universal polymer products lying at the base of a tower of materials and products They enjoy wide use in practically all spheres of human activities.
Both weight loss and electrochemical measurements have been made to study the effects of chromate inhibitor on the erosion-corrosion of carbon steel specimens in a 5 cm diameter slurry pipeline carrying a 20 Vol% aqueous slurry of silica sand (size range 0.3 to 0.6 mm) over a velocity range 2-3.5 m/s. In the absence o…
The polarized single-crystal spectra of GdAl3(BO3)4 containing 3 % Eu3+ have been measured, with particular reference to the absolute ƒ–ƒ absorption intensities, and the crystal structure of the host lattice has been determined from single-crystal X-ray data with a refinement by least-squares methods to R= 0.058. The…
Crystal forms and crystal structure of the metastable polyhydrate (weddellite) and the stable monohydrate (whewellite) occurring in plant cells are described and their formation as well as their physiological bearing are discussed.
Digital techniques for modelling the inrush current associated with the energisation of single-phase transformers are described. The digital results are compared to site measurements on a 6 MVA transformer. The techniques developed were used to investigate the factors such as remanent flux, point on wave switching and…
An expression for the Einstein coefficient of spontaneous emission related to the pseudo-multipolar field, originally proposed by Jørgensen and Judd to account for hypersensitivity, is derived from the crystal field expansion due to point dipoles localized at the ligands. The expression is then successfully applied to…
Abstract The structures of Li 2 SiO 3 [ Cmc 21, a = 9.396(1), b = 5.396(1), c = 4.661(1) Å] and Li 2 GeO 3 [ Cmc 2 1 , a = 9.634(2), b = 5.481(2), c = 4.843(1) Å] have been refined to R values of 0.022 and 0.016 respectively. The distances within the tetrahedral chains were found to be: Si−O = 1.677(2), Ge−O = 1.811(3…
Abstract Films of low‐density polyethylene, polypropylene, and rigid poly(vinyl chloride) were exposed for 1700 h to artificial aging in a Weather‐O‐Meter. Photochemical aging was characterized by tensile measurements. We noted that only ultimate properties are affected, whereas properties defined in the low strain ra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilicon photocathode behavior in acidic vanadium(II)-vanadium(III) solutionsA. Heller, H. J. Lewerenz, and B. MillerCite this: J. Am. Chem. Soc. 1981, 103, 1, 200–201Publication Date (Print):January 1, 1981Publication History Published online1 May 2002Published inissue 1 Jan…
Solution photolysis of hexakis(isopropylammonium) heptamolybdate(VI) trihydrate, [NH3Pri]6[Mo7O24]·3H2O (1), at pH 5.4 leads to reduction to MoV with involvement of hydroxy-radicals, followed by decomposition to yellow and blue species. Propylene and acetone were detected as oxidation products but quantum yields for t…
Irradiation of tris(2,2′-bipyridyl)ruthenium(II) in aqueous solution containing a sacrificial electron acceptor results in formation of bipy3Ru3+, a powerful oxidant which is able, in the presence of a redox catalyst, to oxidise water to O2. Both colloidal RuO2 and simple cobalt(II) ions are effective catalysts for O2…
Black needles of Lix[Pt(S2C4N2)2].2H2O (x ca. 0.75) exhibit a room temperature conductivity of 30–200 Ω–1 cm–1 and a temperature dependence of the conductivity similar to that of the one-dimensional metallic tetracyanoplatinate complexes such as K2[Pt(CN)4]Br0·3.3H2O.
The reaction of[Au9(PPh3)8][NO3]3with KI in acetone yields [Au4(µ-I)2(PPh3)4] which has been shown by X-ray crystallography to contain a tetrahedral gold cluster connected to four terminal triphenylphosphine groups and two edge-bridging iodine ligands; the latter bonding mode is novel for gold clusters.
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
The infrared spectrum (700–4000 cm–1) of quasi-stoichiometric microcrystalline ZnO has been recorded at various temperatures (97–523 K) and following various redox treatments.A broad band centred at ca. 1500 cm–1, produced on samples cooled down to 97 K in oxygen, is ascribed to the increasing concentration of un-ioni…
A short review is given of successively the diamagnetic susceptibility, the refractive index, the dielectric permittivity, the elastic constants and the viscosity coefficients of nematic liquid crystals. Emphasis is on typical results that have been obtained, and the possibilities and problems connected with a molecul…
Silver nitrate 3 mug/ml prevented the separation into two daughter cells of sensitive dividing cells of Pseudomonas aeruginosa growing in nutrient broth plus the chemical. Cell size of sensitive cells was increased and the cytoplasmic contents, cytoplasmic membrane and external cell envelope structures were all abnorm…
Three paramagnetic Fe defect complexes have been observed by electron-spin resonance in chemically reduced crystals of SrTi${\mathrm{O}}_{3}$. These are identified as (1) an ${\mathrm{Fe}}^{3+}$ ion substituted on a Ti site with a nearby charge-compensating interstitial impurity, and (2) and (3) two charge states of s…
Abstract Progress in designing and constructing an atmospheric or environmental scanning electron microscope (SEM) is reported. The introduction of vacuum pumping between the objective and pressure limiting aperture has allowed the use of relatively large pressure limiting apertures, i.e., up to 57 μm for operation at…
Abstract River inputs of dissolved silica into a shallow eutrophic lake (Lough Neagh, N Ireland) are quantified. Exports of silica are high (3.6 to 9.6 tonnes dissolved SiO 2 km −2 y −1 ), but the spring concentration of dissolved silica in the lake depends on release of silica from the sediments. Two planktonic diato…