Materials Literature
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The B and Q electronically excited states maintain a roughly constant energy separation in a wide range of porphyrins and porphyrin dications. An empirical scale, based upon this observation, has been used to discuss the magnitude of the substituent effects in various cases. The results lead to an alternative explanat…
The mechanical properties and dimensions of wood vary as moisture content varies, so moisture content affects wood machining processes and products. Wood machining problems associated with moisture content generally result in machining defects of the wood surface or tool wear. Chip type and machining defects are descr…
The molecular structure of the title compound has been determined by gas-phase electron diffraction, the vapour composition being obtained by quadrupole mass spectrometry. The experimental data can best be approximated by a model with a puckered four-membered ring (C2v symmetry). This deviation from D2h symmetry may b…
Transmission electron diffraction techniques coupled with quantitative x-ray energy dispersive spectroscopy have been used to characterize the phases which develop in austenitic stainless steels during exposure to thermal and to irradiation environments. In AISI 316 and Ti-modified stainless steels some thirteen phase…
Abstract Amorphous polymers are assumed to possess a quasicrystalline structure with chain bundles that are locally parallel over distances ∼1 nm. Two possible types of random motion for a spherical penetrant in such a substrate are described, one type determining the jump frequency and activation energy of diffusion,…
Based on extensive studies of 1 to 70% Al-Zn alloy coatings on sheet steel, the 55% Al-Zn alloy coating was found to have the optimum combination of corrosion resistance, heat resistance and galvanic protection of sheared edges of sheet. This paper reviews the corrosion and heat resistance of this new coated sheet pro…
Studies of different particle size grades of cross linked polyvinylpolypyrrolidone (Polyplasdone G.A.F. Corporation) In direct compression tablet formulations show that Increase in mean particle size enhances powder flow, disintegration and dissolution although hardness and friability were slightly better for tablets…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEstimation of Partial Molar Volume and Fugacity Coefficient of Components in Mixtures from the Soave and Peng-Robinson Equations of StateChung-Tong Lin and Thomas E. DaubertCite this: Ind. Eng. Chem. Process Des. Dev. 1980, 19, 1, 51–59Publication Date (Print):January 1, 198…
Seventeen clones of the marine diatoms Thalassiosira pseudonana and Skeletonema costatum show a wide range of sensitivity to the chemical stress of an industrial waste. Eight clones are of oceanic origin and nine are neritic. Of the neritic clones, three are from heavily polluted estuaries and six from relatively unpo…
Abstract An absorption band at 435 nm with a half‐value width of 0.57 eV which causes the yellowish colour of PbMoO 4 crystals is due to Pb 3+ ions. Pb 3+ ions are produced by oxidation of the crystals or by incorporation of foreign cations of oxidation state lower than 6 at Mo 5+ sites. Usual Pb 3+ ion mole fractions…
The flow aligned viscosities of a series of 4-n-alkyl- and 4-n-alkoxy-4′-cyanobiphenyl liquid crystals have been measured over a range of temperatures. Mixtures of these cyanobiphenyls, some also including a 4-n-alkyl-4″-cyano-p-terphenylh, have been measured and design rules formulated for producing low viscosity mix…
Abstract BaCdSnS 4 wurde erstmals präpariert und die Kristallstruktur an Einkristallen bestimmt. Gitterkonstanten: a = 2186 ± 2; b = 2169 ± 1; c = 1318 ± 0,5 pm. Raumgruppe C ‐Fdd2. Die Kristallstruktur enthält Doppeltetraeder [CdSnS 4 ] 2− . Sie sind in charakteristischer Weise zu zweidimensionalen, unendlichen Netze…
For the purpose of studying interdiffusion in the ζ-solid solution of a Ni–Al system, the experiments were performed using a method of vapor-solid couple at 1273∼1573 K . As a vapor source, the fine chips of 12 mass% Al–Ni alloy (ζ+ε phases) were used. The surface concentration of Al in the diffusion annealed test pie…
Abstract The crystal structures of the two title compounds have been refined with three-dimensional Mo Kα X-ray intensities. Results for both are given in the order a , b , c , β , Z , space group, number of independent reflections, R (unweighted), R (weighted): Ba 2 [Si 4 O 10 ](l): 7.688(1) Å, 4.629(1) Å, 13.523(1)…
The behaviors of copper (II) ions and zinc ions in calcium bicarbonate parent solution at the formation of calcite and the influence of fluoride ions on them have been studied through the measurement of the distribution coefficients of copper and zinc between calcium bicarbonate parent solution and calcite precipitate…
The interaction of solid and liquid solutions of hydrogen, nitrogen, oxygen, and carbon in metals with molecules of the surrounding gas atmosphere is the central subject of this review. The characteristic features of this large field are demonstrated by discussing the basic principles, typical reaction mechanisms, and…
It is well known chat magnesium scearace, used'as tablet lubricant, can form a continuous hydrophobic film around solid particles when nixing tines are too long, so that disintegration tine increases and nechanical strength of tablets fails. It was also shown in previous works chat the addition of colloidal silicon di…
Several kinds of metal-insulator transitions are discussed.In non-crystalline systems a second order "Anderson" transition can be described without considering electron-electron interaction.In crystalline systems, we describe band-crossing transitions and "Mott" transitions, both of which shoulc show a discontinuity i…
This tutorial paper describes techniques for processing microorganisms for scanning electron microscopy (SEM). For ease of discussion, the subject is divided into two sections: A. General Processing Requirements, and B. Specific Processing Techniques. The objective of the first section is to outline processing require…
The photoprocesses on semiconducting n-TiO2 and n-SrTiO3 electrodes in the presence of reducible surface species are described. These species are generated by pre-illumination with the band-gap light of the electrodes being operated under reverse bias. The amount formed in the course of this pre-illumination can be re…