Materials Literature
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Copepod feeding on the colony-building diatom Thalassiosira partheneia was studied in spring 1975 in the Northwest African upwelling area. Healthy, whole colonies of T. partheneia (diameter -1 cm) were offered as food as well as single cells (diameter -9 pm) after disintegration of the colonies. In addition, comparati…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of synthesis gas-mixture components on activated carbonRobert J. Wilson and Ronald P. DannerCite this: J. Chem. Eng. Data 1983, 28, 1, 14–18Publication Date (Print):January 1, 1983Publication History Published online1 May 2002Published inissue 1 January 1983https:…
Rapid solidification technology , Rapid solidification technology , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
Several mechanical relaxation phenomena are observed on glasses. The characteristics of these phenomena vary from one type of glass to another but some features seem to be common to all solids in the vitreous state. Hence, results about: 1) oxide glasses; 2) organic glasses; 3) vitreous semi-conductors; 4) metallic gl…
The kinetics of the crystallisation of barium sulphate has been studied by following the changes in ionic conductivity in supersaturated solutions containing both stoichiometric and non-stoichiometric concentrations of the lattice ions at 298 K. The rate of growth showed a quadratic dependence upon the relative supers…
Results of thermal gravimetric analysis, electrical conductivity and 1H n.m.r. studies of Prussian Blue, Fe3+4[Fe2+(CN)6]3·nH2O, a classical mixed-valence compound exhibiting semiconducting behaviour in the temperature range 30–150 °C, are presented. Three different stages of hydration together with the anhydrous form…
Abstract not Available.
Abstract The specific surface energy of the (112) face of the chalcopyrite structure A I B III C 2 VI compounds is calculated accounting for contributions from long‐ranged, metallic forces and short‐ranged, directional covalent forces. From the surface energies the bulk modulus and the atomization energy of all A I B…
We calculate the response of an ice crystal to a spatially varying applied electric field. The dielectric polarization of the ice is not assumed to be proportional to the local macroscopic electric field. Instead, we formulate an expression for the free-energy density of an ice crystal with non-uniform polarization an…
Clifford R. Parks, Norton G. Miller, Jonathan F. Wendel, Karen M. McDougal, Genetic Divergence Within the Genus Liriodendron (Magnoliaceae), Annals of the Missouri Botanical Garden, Vol. 70, No. 4 (1983), pp. 658-666
SummaryA novel process for the plating of decorative chromium from the trivalent state is described. Features of this new process include: colour of deposit virtually indistinguishable from that of conventional chromium; excellent throwing and covering power; low chromium concentration (ca 5 g/1) and simple effluent t…
Benzo-1,4-quinone quenches the triplet excited state of many metalloporphyrins in ethanol solution and the overall quenching rate constants are a simple function of the thermodynamic driving force for electron transfer. The resultant ion-pair can dissociate to separated ions or recombine to ground-state reactants. The…
Abstract Retrogradation tendencies of starch from local materials at two storage temperatures (10 and 30°C) were investigated. The kinetics of the crystallization process were studied using the Avrami equation. The values for the Avrami exponent and rate constant differ greatly at the two storage temperatures and for…
Various form-factor theories used to predict Rayleigh-scattering cross sections of gamma-ray photons are examined. For energies above the $K$ threshold comparisons are made with more accurate numerical calculations, for a high-$Z$ element (Pb), primarily at small momentum transfers [up to $x\ensuremath{\equiv}{\ensure…
The molecular structures of the hydrolyzates of γ-aminopropyl-triethoxysilane (γ-APS) were studied by Fourier transform infrared spectroscopy (FT-IR). The molecular structure of γ-APS is a function of the pH of the solution and the drying conditions. In the partially cured film, cast from a 20% by weight γ-APS aqueous…
Transient and dc photoconductivity measurements are presented for two low-mobility dielectrics, poly (vinylidene fluoride) and polyethylene terephthalate. In each case, the data are analyzed using the present models for dispersive transport, and the inadequacies of these theories when applied to these low-mobility die…
Chemisorbed atomic oxygen is the crucial surface species which selectively oxidises ethylene to ethylene oxide; adsorbed dioxygen plays no direct role in this reaction.
A general method for describing multimodal atomic densities is presented. It is based on series expansions of a harmonic Gaussian probability density function. The most suitable expansion is of the Gram-Charlier type; its Fourier transform can be easily inserted in a structure factor equation. This statistical method…
Microscopic examination of (NH4)2Cr2O7 crystallites, previously decomposed to measured extents, has given strong evidence that reaction proceeds through the intervention of a melt. This reaction has previously been accepted as occurring in the solid phase and the use of higher magnifications than were applied previous…