El vidrio en la construcción. Situación actual y orientación de la l+D
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Cement: Administrative tender specifications and standards in Spain
The paper describes, in chronological order, the different competent Authorities in Spain and the documents issued by them regarding Cement Regulations and Standards. The origin of the early cement quality Rules is referred to, the issuing of Regulations by the Public Bodies and finally the adoption of National Standa…
La normalización de piedras naturales
The natural stone sector, like any other industrial sector, requires the technological support of standardization for its promotion and development. As a consequence of the creation of AENOR, CTN 22 "Mining and Explosives" consisting of seven subcommittees, was founded. Subcommittee 7 "Natural Stone" is composed of re…
Rock as a construction material: durability, deterioration and conservation
The different aspects related to the deterioration and conservation of stone, used as a construction material, are reviewed in this article. The petrographical characteristics and physical properties which control the durability of stone material are stated. The importance of the voids and the properties more directly…
Concrete durability
The evidence that the concrete is not a material for ever was noticed from the beginning of its industrial use. In the present work, the author describes the studies carried out during the last century and the early ages of the present one, mainly devoted to the study of the durability in sea water. At the present day…
Actos conmemorativos del ICCET/CSIC. Entrega de medallas y nombramiento de miembros honorarios, 1990
El día 21 de enero pasado tuvo lugar, en la Sala de Conferencias del Instituto de Ciencias de la Construcción "Eduardo Torreja", el Acto de Entrega de Medallas y Nombramiento de Miembros de Honor del Instituto. La Sesión comenzó a las 10 horas con unas palabras de presentación pronunciadas por D. Rafael Blázquez, Dire…
Fatiga higroscópica y dimensional de la madera
This article abridges the investigation line followed to demonstrate and to evaluate the physical phenomenon of the hygroscopic fatigue dimensional. For such intention has been used the construction of isothermals for 20 ºC and the establishment of oldness coefficients to evaluate such process.
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Structure of the amorphous phase in crystallizable polymers: poly(ethylene terephthalate)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of the amorphous phase in crystallizable polymers: poly(ethylene terephthalate)N. S. Murthy, S. T. Correale, and H. MinorCite this: Macromolecules 1991, 24, 5, 1185–1189Publication Date (Print):March 1, 1991Publication History Published online1 May 2002Published in…
Viscoelastic behavior of lightly sulfonated polystyrene ionomers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscoelastic behavior of lightly sulfonated polystyrene ionomersR. A. Weiss, J. J. Fitzgerald, and D. KimCite this: Macromolecules 1991, 24, 5, 1071–1076Publication Date (Print):March 1, 1991Publication History Published online1 May 2002Published inissue 1 March 1991https://…
Textured ZnO Thin Films for Solar Cells Grown by Metalorganic Chemical Vapor Deposition
Textured ZnO films have been grown by metalorganic chemical vapor deposition (MOCVD) using diethylzinc (DEZ) and H 2 O as reactant gases. It was found that the surface morphology of films was strongly dependent on the substrate temperature. For the low substrate temperature of 150°C, the surface consists of uniformly…
Binary blends of poly(ether ether ketone) and poly(ether imide): miscibility, crystallization behavior and semicrystalline morphology
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBinary blends of poly(ether ether ketone) and poly(ether imide): miscibility, crystallization behavior and semicrystalline morphologyG. Crevecoeur and G. GroeninckxCite this: Macromolecules 1991, 24, 5, 1190–1195Publication Date (Print):March 1, 1991Publication History Publi…
The effect of carbonate contaminations on the XPS O 1s band structure in metal oxides
Abstract The aim of the paper is to give examples of XPS analysis, showing how O 1s bands can be affected by surface carbonates. A proper peak assignment (e.g. to O − OH − species) needs the preliminary determination of a carbonate contribution. Although the samples examined represent Co and La compounds only, the pri…
Raman spectra of graphite as indicators of degree of metamorphism
This study demonstrates the usefulness of Raman microspectroscopy an evaluation of the crystallinity of graphite in natural samples. The sensitivity obtained is at least as good as that for X-ray diffractometry. Laser Raman microprobe analyses of graphite separates, mostly from suites of regionally metamorphosed carbo…
Pyramid-array surface-relief structures producing antireflection index matching on optical surfaces
Surface-relief structures having the form of an array of modified pyramids (having curved rather than flat triangular shown to produce an index-matching layer that will reduce surface reflection by several orders of sides) are Such structures are equivalent to a quintic (fifth-order polynomial) gradient-index layer, w…
Characterization of Terfenol-D for magnetostrictive transducers
Measurements were made of the piezomagnetic d33 coefficient, the free permeability, μ33T, and the open-circuit elastic compliance coefficient, s33H, of grain-oriented Terfenol-D, Tb0.3Dy0.7Fe1.93, produced by a modified Bridgman technique. Prestress levels to 9500 psi (65 MPa) and magnetic bias fields up to 2200 Oe (1…
.alpha.'-Sialon ceramics: a review
a' -Sialon ceramics promise the possibility of a reduction of the amount of glassy grain boundary phases by incorporating the oxides, present in the starting mixture as either sintering additives or impurities, into its rmallattice. It has been shown that techniques such as gas pressure sintering can be used successfu…
X-ray spectroscopic studies of nickel complexes, with application to the structure of nickel sites in hydrogenases
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray spectroscopic studies of nickel complexes, with application to the structure of nickel sites in hydrogenasesGerard J. Colpas, Michael J. Maroney, Csaba Bagyinka, Manoj Kumar, William S. Willis, Steven L. Suib, Pradip K. Mascharak, and Narayan BaidyaCite this: Inorg. Ch…
Crystal structure of stereocomplex of poly(L-lactide) and poly(D-lactide)
An equimolar mixture of poly(L-lactide) and poly(D-lactide) was crystallized into a stereocomplex whose crystal system is triclinic (P1) with cell dimensions: a = 0.916 nm, b = 0.916 nra, c (chain axis) = 0.870 nm, α = 109.2°, β - 109.2°, and γ = 109.8°. In the unit cell, a poly(L-lactide) segment and a poly (D-lactid…