Materials Literature
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Se describe Nannochloropsis gaditana Lubién spec. nov., Eustigmatophyceae aislada de la Bahia de Cádiz, como resultado de los estudios sobre su morfología, ultraestructura, composición de pimentos y fisiología del crecimiento. N. gaditana se diferencia de las otras dos especies, N. oculata (Droop) Hibberd y N. salina…
The kaolin minerals are not ideal ionic solids but, for many purposes, they can be treated as such. The classical ionic theory allows the calculation of the potential energy of these minerals. By minimizing the potential energy as a function of one or more parameters (distances, angles, etc.) one can determine hydroxy…
Seven kaolins were examined. Several phases containing iron were analysed by comparison of the used spectroscopies. Mössbauer spectroscopy shows that a part of the Fe²⁺ cannot be in the structure of kaolinite. At low temperature, we observe for one sample, presence of superparamagnetic particles of hematite and goethi…
We apply the matrix representation technique to determine the concentrations of three dye components in the liquid-crystal mixture needed to make a black-and-white guest-host display. This method employs the Newton-Raphson iterative process to match the tristimulus values of the mixture to the tristimulus values of th…
The electronic and resonance Raman spectra of a series of halogen-bridged, linear-chain, mixed-valence complexes, [PtII(N–N)2][PtIV(N–N)2X2]X4[N–N = 1,2-diaminocyclohexane (dach); X = Cl, Br, or I], as well as of the complexes [PdII(dach)2][PdIV(dach)2Cl2]Cl4 and [PtII(N–N)2][PtIV(N–N)2Br2]Br4[N–N = 1,2-diaminocyclope…
CoO–MgO solid solutions of CoO concentrations 0.25–15.3 mol % have been investigated by e.s.r. spectroscopy in the temperature range 4–77 K. The distribution of isolated Co2+ ions between octahedral and tetrahedral sites has been estimated quantitatively. In the most dilute solid solutions (up to 3.00 mol % CoO) Co2+…
The magnetoresistance and Hall coefficient in the charge-density-wave (CDW) state of 2 H -NbSe 2 and 2 H -TaSe 2 have been measured at low temperatures in magnetic fields up to 150 kOe, using high-quality single crystals. The results on these two compounds have been compared with those on 2 H -NbS 2 which has no CDW t…
It was confirmed that one of the principal factors which influences the acoustical absorption of flexible polyurethane foam is flow resistance of foam. Normal polyester-based flexible polyurethane foam itself has an adequate value of flow resistance and shows fairly good sound absorption. Acoustical absorption of norm…
The structures of anorthite and albite melts have been investigated with the X-ray diffraction method. The scattered intensities were measured at 1600°C and 1200°C on the anorthite and albite melts, respectively. The radial distribution function reveals that the basic structural units of the two melts are the TO4 (T=S…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStrong oxide-oxide interactions in silica-supported magnetite catalysts. 2. The core/shell nature of the interactionCarl R. F. Lund and J. A. DumesicCite this: J. Phys. Chem. 1982, 86, 1, 130–135Publication Date (Print):January 1, 1982Publication History Published online1 Ma…
Following room-temperature irradiation of quartz crystals by x rays or γ rays, a transient enhancement of electrical conductivity is observed which decays over a period of several hours. This enhanced conductivity is produced by alkali ions (M+) which are liberated during the irradiation. By freezing in this transient…
A genomic clone containing sequences of five feather keratin genes has been isolated using cDNA to chicken embryonic feather keratin mRNA as a probe. The clone probably represents part of a longer cluster of tandemly spaced genes; the genes are evenly spaced with a centre to centre separations of 3.3 kb and are transc…
The author refers 35 valid species to the genus Sarcophyton. The holotypes of nearly all species could be examined; of only three species (S. elegans, S. glaucum, and S. latum) their depository is unknown. The holotypes of eight species were described earlier by the present author, in four cases in co-operation with o…
The arrangement and proportion of collagen fibres and fibre bundles in the dermis of the pig have been investigated with light microscopical (Nomarski's interference contrast, polarization optics) and scanning electron microscopical methods. Skin samples were obtained from different body regions of wild boars, domesti…
In Norway the bedrock generally is glacially polished with no appreciable signs of weathering. Little is known about the thickness, age and composition of the weathered regolith that overlay these areas in preglacial time. Occurrences of isolated pockets and smaller areas of deeply weathered rocks appear, however, to…
Rotational averages of even rank up to 10 are expressed as linear combinations of invariants and are shown to be easy to evaluate by computer programming. Simple relations between averages of different rank are obtained. Averages of odd rank may be straightforwardly derived from averages of even rank.
Discharge and charge characteristics of various phthalocyanine cathodes coupled with lithium metal are studied. The best capacity based only on cathode active material weight is 1440 A‐hr/kg in the lithium/iron phthalocyanine system, and the cycle life of the lithium/Cu phthalocyanine system is more than 100 times at…
The modulated structure of the NC-type pyrrhotite Fe1 - xS with x = 0.09 has been determined. The analysis is based on a four-dimensional space group, Wpna21qq1, and an anharmonic modulation model with 53 positional, two thermal, and eight occupational parameters including up to fourth-order harmonics, a = 11.952, b =…
The X-ray structural determination is reported for the first compound possessing a single carbon atom bridging tow first-row transition metals with a linear Fe–C–Fe bond and an Fe–C bond length of only 1.675 Å.
La solubilité dans l'eau d'un système binaire de carbonates est régie par le produit total de solubilité, qui est la somme ∑∏ des produits partiels de solubilité des deux pôles. ∑∏, tracé en fonction du titre molaire de la phase solide et de celui dans la solution aqueuse, donne des courbes semblables aux diagrammes d…