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Arenas normalizadas españolas. Su preparación. ARENAS en el lETcc. 1.ª Parte

In 1919, the Ministry of Public Works made the Central Laboratory responsible for all referring to sands with respect to the evaluation of tensile and compressive strengths of cement mortar. After 1956, the then Technical Institute of Construction and Cement took over the preparation and supply of this type of Spanish…

Bibliografía

Analysis of results of tests carried out on earth test pieces

A series of test pieces of 4x4x16 were prepared from Red Earth from Soria, the physical-chemical characteristics of which are given. The effect of each of the following upon the test pieces was studied: increasing the amount of cement on different earth/sand proportions; the type of cement; the variation of the cement…

Reactivity and burnability of cement raw materials witt high manganese content

It has been verified that high manganese content in raw mixes causes alters the mineralogical composition of clinkers. New phases like 2 CaO.Mn02 and Ca2AIMnO5 are developed and C3A formation can be inhibited. Manganese is a flux similar to iron in the traditional raw mixes. The presence of manganese will modify the e…

Editorial

Phenomenal Colors and Sorites

Nontrans has been used as a stick with which to beat sense-datum theorists as well as to cast doubt on the possibility of giving a rational reconstruction of the semantics of everyday color terms. In both cases, what is called into question is the coherence of phenomenal color predicates, or, alternatively, the concep…

Bonding-state characterization of constituent elements in phyllosilicate minerals by XPS and NMR

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBonding-state characterization of constituent elements in phyllosilicate minerals by XPS and NMRA. R. Gonzalez-Elipe, J. P. Espinos, G. Munuera, J. Sanz, and J. M. SerratosaCite this: J. Phys. Chem. 1988, 92, 12, 3471–3476Publication Date (Print):June 1, 1988Publication Hist…

Oscillatory convection in liquid metals in a horizontal temperature gradient

Abstract When growing semiconductor crystals from the melt, the free convection induced in the liquid phase by the imposed thermal boundary conditions can become periodic in time. Recently, the onset of this oscillatory convection has been simulated directly through solution of the time‐dependent governing equations f…

New solvable model of polymer-chain adsorption at a surface

We solve exactly for the polymer adsorption transition in the two- and three-dimensional directed self-avoiding walk models, by employing a novel transfer-matrix approach. The behavior of the fraction of adsorbed monomers at the threshold and in the high-coverage regime is described in detail, as is the phase diagram…

Heat capacity and glass transition behavior of amorphous ice

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeat capacity and glass transition behavior of amorphous iceY. P. Handa and D. D. KlugCite this: J. Phys. Chem. 1988, 92, 12, 3323–3325Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Published inissue 1 June 1988https://pubs.acs.org/doi/10.…

The generalized integration method for predicting impulse volt-time characteristics for non-standard wave shapes-a theoretical basis

A theoretical basis for the integration method of predicting the strength of insulation subjected to impulses of nonstandard wave shapes is presented. Two theoretical approaches are developed for a general physical model of impulse breakdown applicable to gaseous, liquid, and solid insulation, and from an energy-balan…

Preparation, structure, and properties of two‐phase co‐continuous polymer blends

Abstract Phase continuity has been explored as a function of composition for three two‐phase polymer blends produced by mixing in the melt: polystyrene/poly(methyl methacrylate), polystyrene/cis‐polybutadiene, and poly(methyl methacrylate)/ethylene‐propylene rubber. The condition for dual phase continuity Is the appli…

Electrolyte Effects on the Switching Reaction of Polyaniline

This report describes the electrochemical behavior of polyaniline prepared in aqueous solution with various acid electrolytes. Electroactive polyaniline with two different cyclic voltammograms, i.e. , with and without the additional peak at 500 mV, can be produced by controlling the current densities during the prepar…

Putative structure and functions of a poly-beta-hydroxybutyrate/calcium polyphosphate channel in bacterial plasma membranes.

A poly-beta-hydroxybutyrate complex extracted from the plasma membranes of genetically competent Escherichia coli contained polyhydroxybutyrate:polyphosphate:calcium in molar ratios approximating 1:1:0.5. The chain length of the polyhydroxybutyrate was estimated as 120-200 subunits, and that of the polyphosphate was e…

Synthesis of naphthalene-bridged porphyrin dimers and their orientation-dependent exciton coupling

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of naphthalene-bridged porphyrin dimers and their orientation-dependent exciton couplingAtsuhiro. Osuka and Kazuhiro. MaruyamaCite this: J. Am. Chem. Soc. 1988, 110, 13, 4454–4456Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Pub…

Measurement of spatial charge distribution in thick dielectrics using the pulsed electroacoustic method

Measurement techniques of volume charge distribution within insulating materials are developed using a pulsed electroacoustic method. The fundamental equation of the relation between the charge distribution in the insulating material and the signal voltage from the electroacoustic transducer is presented along with th…

Five-fold diamond structure of adamantane-1,3,5,7-tetracarboxylic acid

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFive-fold diamond structure of adamantane-1,3,5,7-tetracarboxylic acidOtto. ErmerCite this: J. Am. Chem. Soc. 1988, 110, 12, 3747–3754Publication Date (Print):June 1, 1988Publication History Published online1 May 2002Published inissue 1 June 1988https://pubs.acs.org/doi/10.1…

Quantitative analysis of the inelastic background in surface electron spectroscopy

Abstract Recent progress, in the quantitative analysis of the distortion of surface electron spectra, resulting from inelastic electron scattering, is reviewed. A physical model for the problem is formulated and based on this, basic deconvolution formulae are found. In the formulae, detailed information on the differe…

Ion-exchanged glass waveguides: a review

Passive glass waveguides made by ion-exchange technique are potential candidates for integrated optics (IO) applications. The authors review the advantages in the technology as applied to fabrication of useful single-mode structures. Progress in process, fabrication, modeling, and waveguide performance using different…