Materials Literature
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Cuando en 1967 GAS NATURAL, S. A. de Barcelona realizaba los estudios del mercado potencial de consumidores de gas natural, en el área de Barcelona, se establecieron conversaciones sobre la posibilidad de emplearlo en la fábrica de Cementos Sansón, que L.A.C.S.A. posee en Sant Felíu de Llobregat.
Venir a hablar del cemento en el "Santuario del cemento" como muy bien podría llamarse a este Instituto Eduardo Torreja, es una osadía-sólo permisible a los alquimistas de este preciado material de construcción o a los tecnólogos que dominan y perfeccionan cada día los procesos de producción y amplían el campo de sus…
En este artículo tenemos la ocasión de informar acerca de una nueva técnica en el campo de la producción de clínker de cemento, que ha sido desarrollada por Ishikawajima- Harima Heavy Industries y es conocida como el sistema I.H.I.-S.F.
Hace más de un año que empezamos a preparar estos coloquios. Pecaría de injusticia si mis primeras palabras no fueran para dedicar un cariñoso recuerdo a tres personas, a tres amigos queridos, involucrados en esta preparación que nos han abandonado en el transcurso de este año.
A partir del comienzo de la década de los años sesenta y hasta finales de 1973, momento en el que se desencadenó la crisis energética, el desarrollo industrial de España fue sin duda muy notable. Factores decisivos de ese desarrollo se debieron a los progresos alcanzados en el automatismo y mecanización de los diferen…
El intercambiador de calor por suspensión en gases, de cuatro etapas, está destinado a someter el crudo de cemento a un tratamiento primario antes de su entrada al horno rotatorio. Se ofrece ya sólo en Europa por lo menos por cuatro fabricantes de renombre. La primera planta de este tipo operada a escala industrial se…
La reciente crisis del petróleo, una crisis que parece lejos de terminarse, ha impulsado la búsqueda, bien sea de nuevas fuentes de energía o bien de nuevos yacimientos. Con la excepción de algunos países que gozan de unas reservas privilegiadas, los demás han ido ampliando el campo dé sus exploraciones a la plataform…
A new anisotropic permanent magnet was developed in the Mn-Al-C system, using warm-plastic deformation, with the following magnetic properties : Br = 6100 G, bHc = 2700 Oe and (BH)max = 7.0 MG-Oe. This magnet has good machinability in that it can be shaped and drilled using a lathe while in the magnetic phase state. T…
An examination of average dipole coordinate matrix elements and electronic excitation energies in over 140 solids, liquids, and molecules reveals simple trends related to polarity, metallicity, ionicity, anion–anion ’’contact’’, cation core hybridization, and disorder. These results point to the key roles played by me…
The multislice formulation of Cowley and Moodie for high-energy electron scattering is rederived from the Schrödinger equation, and the validity of the finite slice approach in practical computation is theoretically proved by the stationary-phase approximation. A set of computer programs for the multislice method is d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Study of Equilibrium Melting of PolyethyleneBernhard Wunderlich and George CzornyjCite this: Macromolecules 1977, 10, 5, 906–913Publication Date (Print):September 1, 1977Publication History Published online1 May 2002Published inissue 1 September 1977https://pubs.acs.org/do…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectroscopic studies of iron oxidesN. S. McIntyre and D. G. ZetarukCite this: Anal. Chem. 1977, 49, 11, 1521–1529Publication Date (Print):September 1, 1977Publication History Published online1 May 2002Published inissue 1 September 1977https://doi.org/10.…
The present state of research in the field of the natural polysaccharide chitin and chitosan is described. The bibliography includes 225 references.
The origin of thermoluminescence in dysprosium doped CaSO 4 phosphor has been attributed to the reduction of RE 3+ to RE 2+ by the capture of an electron in the irradiation process and its reconversion back to RE 3+ in the heating process of the thermoluminescence, the reconversion being due to a thermally released ho…
The defects are observed in the optical spectrum of irradiated diamond. TR12 has many very sharp phonon replicas in absorption, but fewer in photoluminescence. During electron irradiation at room temperature the defect is produced initially as the cube of the dose. It can be induced only in type II diamonds, and is pr…
The numerous layers of these strong collagen fibers, closely bound together by cross-over collagen fibrils joining the different layers, is believed to serve at least in part a mechanically protective function and possibly as a firm anchorage for the body musculature. Single layers of the more superficial collagen fib…
A theoretically based proposal of a concrete physical realization of a Lifshitz point is given for the first time. This point should occur on the $\mathcal{H}\ensuremath{-}T$ diagram of a chiral liquid crystal exhibiting a second-order transition between the smectic phases $A$ and helicoidal $C$ ($\mathcal{H}$ is a ma…
Salicylic acid forms a 1:1 complex with boric acid, the reaction involving both the fully protonated ligand, and the salicylate ion. The kinetics of this reaction have been studied by the stopped-flow method. The stability constant for the reaction involving salicylate ion has been calculated from measurements of the…
We have measured the Raman spectra of AgBr and AgCl in both the high-temperature solid and the melt. The melt spectra are strikingly similar to the spectrum of the superionic conductor $\ensuremath{\alpha}\ensuremath{-}\mathrm{AgI}$. We have found that second-order Raman scattering from short-wavelength vibrations ("z…