Determinación del contenido de compuestos de cromo en el cemento portland por espectrofotometría de absorción atómica. Primera parte
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Método para la determinación de cloruros en pequeñas concentraciones
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Ciencia y técnica española del I.E.T.c.c. en Iberoamérica
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Carbonatación del hormigón. Simposio internacional RILEM
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Durabilidad del hormigón. Resistencia química de los cementos
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Electronic Spectra and Electronic Structure of TCNQ Complexes
Abstract Electronic spectra of several TCNQ, complexes have been measured with single crystals by the transmission method. The assignment of electronic transitions are presented based on the electronic structure of the crystals. The molecular viewpoint is stressed in a theoretical treatment. The spectra are interprete…
The work-hardening of copper-silica v. equilibrium plastic relaxation by secondary dislocations
Continuum plasticity is used to derive a new model for the plastic zone of secondary dislocations (B structure) observed around undeformable particles in a plastically deformed metal matrix. The model is compatible with observations of these dislocations by electron microscopy. The contribution of these dislocations t…
Studies of nickel-tungsten-alumina catalysts by x-ray photoelectron spectroscopy
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of nickel-tungsten-alumina catalysts by x-ray photoelectron spectroscopyKung T. Ng and David M. HerculesCite this: J. Phys. Chem. 1976, 80, 19, 2094–2102Publication Date (Print):September 1, 1976Publication History Published online1 May 2002Published inissue 1 Septem…
Stabilization of planar tetracoordinate carbon
Abstract: The energies of planar vs. tetrahedral geometries of tetracoordinate organic molecules have been surveyed by ab initio molecular orbital calculations. Because of their 7 ~ acceptor and u donor character, electropositive substituents, especially lithium, are particularly effective in stabilizing the planar ar…
Methods for predicting the thermal conductivity of composite systems: A review
Abstract The thermal conductivity of a solid or gas filled polymer is used in processing or end use application calculations. Numerous theoretical and empirical correlations are found in the literature. A careful review of these models indictes that no one correlation or technique accurately predicts the thermal condu…
Crystal Growth from High Temperature Solutions
Abstract not Available.
Relation between the singlet-triplet splitting and the copper-oxygen-copper bridge angle in hydroxo-bridged copper dimers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRelation between the singlet-triplet splitting and the copper-oxygen-copper bridge angle in hydroxo-bridged copper dimersVan H. Crawford, H. Wayne. Richardson, John R. Wasson, Derek J. Hodgson, and William E. HatfieldCite this: Inorg. Chem. 1976, 15, 9, 2107–2110Publication…
New figure of merit for transparent conductors
A figure of merit for transparent electrode materials has been defined by φTC=T10/Rs, where T is the optical transmission and Rs is the electrical sheet resistance. Expressions are derived to predict the transparent electrode properties of a material from its fundamental electrical and optical constants. The performan…
The Gas-phase Nitration of Alkanes
The principal chemical and kinetic results obtained for this reaction are reported and discussed critically. A brief description is given of its industrial application to the manufacture of nitroalkanes. The detailed mechanism suggested during recent years for the nitration of alkanes by nitrogen dioxide is discussed…
Acoustic-Phonon Softening in the Invar AlloyFe3Pt
Inelastic neutron scattering experiments on an ordered Invar alloy ${\mathrm{Fe}}_{3}$Pt show large softening of the [100]TA and [110]T${\mathrm{A}}_{1}$ acoustic shear modes below the Curie temperature. In addition, a central peak is observed below 100 K, which, however, behaves noncritically. The phonon softening is…
The dielectric coupling of low-energy excitations in vitreous silica to electromagnetic waves
Measurements of the variation of the dielectric constant with temperature at 11 GHz and between 0.4 and 14K have shown that the coupling between electromagnetic waves and the low-energy excitations present in vitreous silica strongly depends on the concentration of OH - ions. This result can be explained by an increas…
Etude des propriétés viscoélastiques de quelques mélanges polybutène‐1 – polypropène
Abstract Die viskoelastischen Eigenschaften von Mischungen aus Polybuten‐1 und Polypropen werden im β‐Relaxationsgebiet untersucht. Es gibt nur einen Relaxationspeak, und die Mischungen scheinen in der amorphen Phase verträglich zu sein. Diese Beobachtungen bestätigen die von uns bereits früher aufgestellten Hypothese…
Evidence for more than one C2+ion transport mechanism in mitochondria
The active transport and internal binding of the Ca2+ analogue Mn2+ by rat liver mitochondria were monitored with electron paramagnetic resonance. The binding of transported Mn2+ depended strongly on internal pH over the range 7.7-8.9. Gradients of free Mn2+ were compared with K+ gradients measured on valinomycin-trea…