Acción del agua de mar sobre un cemento portland de alta resistencia inicial, sobre un cemento portland resistente a los sulfatos y sobre un cemento portland: influencia de la adición de escoria. Estudio por DRX
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Free lime quantitative determination by X ray diffraction, on anhiydrous and dried cement
In manufactured cements, and concerning the quality control, the fast determination of the contents of free lime is a necessary step. The measurement of the content is made taking the net altitude of one peak of the DRX which, on each case, is peculiar to the compound to be determined. So, a calibrating curve is drawn…
Approach to the effect of concrete resistivity in the corrosion of rebars in concrete
The concrete resistivity has been considered as a factor which affects the corrosion rate of the rebars. Untill now the only relation found has been stablished between potentials and resistivity for steel embedded in Chloride contaminated concrete. In this paper a comparison between corrosion rate of rebars, determine…
The structure of calcium-aluminium glasses: X-ray diffraction and computer simulation studies
The authors present an investigation of the atomic structure of the metallic glass Ca 60 Al 40 by energy-dispersive X-ray diffraction and computer simulation studies based on pseudopotential-derived interatomic forces. The characteristic features of the structure of Ca 60 Al 40 are the large contraction of the Ca-Ca n…
Puzzolanic cements of greater resistance at the attack of selenitic waters than the high sulfate resistance portland cements, and viceverse
This work confirms the certainty of the predictions of useful service given by Kaluosek and al. for the sulphate resistant portland cements (type V, USA), subject to severe selenitic attack. Two sulphate resistant portland cements, were tested by means of the Le Chatelier Anstett method. The tarts were destroyed at ag…
Quantity of Soap as a Variable in Handwashing
The purposes of this study were to assess the effect of two quantities (1 mL or 3 mL) of four different handwashing products on reductions in log colony-forming units (CFU) from the hands and to determine the amount of liquid soap used for handwashing by personnel in one hospital. First, 40 subjects were assigned by b…
Thermal conductivity of a polymer composite filled with mixtures of particles
Abstract A new thermal conduction model is proposed for a polymer system filled with a mixture of several types of particles. Predicted values by the new model are compared with experimental data. The model is derived by extending a model that was previously proposed for a two‐phase system. The following equation is d…
Conductivity of Porous Ni / ZrO2 ‐ Y 2 O 3 Cermets
The conductivity of porous cermets at 1000°C was determined as a function of Ni content between 15 and 50 volume percent (v/o) of total solids for two different zirconia particle sizes (23 and 47 m 2 /g). Below Ni contents of 30 v/o, ionic conduction through the zirconia phase dominated. At 30 v/o Ni, a greater than t…
On measuring the distribution of local free volume in glassy polymers by photochromic and fluorescence techniques
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn measuring the distribution of local free volume in glassy polymers by photochromic and fluorescence techniquesJohn G. Victor and John M. TorkelsonCite this: Macromolecules 1987, 20, 9, 2241–2250Publication Date (Print):September 1, 1987Publication History Published online…
Preparation and physical properties of trinuclear oxo-centered manganese complexes of general formulation [Mn3O(O2CR)6L3]0,+ (R = methyl or phenyl; L = a neutral donor group) and the crystal structures of [Mn3O(O2CMe)6(pyr)3](pyr) and [Mn3O(O2CPh)6(pyr)2(H2O)].cntdot.0.5MeCN
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and physical properties of trinuclear oxo-centered manganese complexes of general formulation [Mn3O(O2CR)6L3]0,+ (R = methyl or phenyl; L = a neutral donor group) and the crystal structures of [Mn3O(O2CMe)6(pyr)3](pyr) and [Mn3O(O2CPh)6(pyr)2(H2O)].cntdot.0.5MeCN…
Spectroscopic analysis of phase separation behavior of model polyurethanes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic analysis of phase separation behavior of model polyurethanesHan Sup Lee, Ying Kang Wang, and Shaw Ling HsuCite this: Macromolecules 1987, 20, 9, 2089–2095Publication Date (Print):September 1, 1987Publication History Published online1 May 2002Published inissue 1…
Prediction of the glass transition temperature of polymers: A model based on the principle of corresponding states
Abstract The application of corresponding state principles to describe the properties of polymers is implicit in many of the fundamental studies of polymeric behavior. The seminal works of Prigogine, Hildebrand, Eyring, Flory, Gibbs, and DiMarzio in which multidimensional lattice representations and refined statistica…
Introduction to microelectronic fabrication
(NOTE: Each chapter concludes with Summary, References, and Problems.) Preface. 1. An Overview of Microelectronic Fabrication. A Historical Perspective. An Overview of Monolithic Fabrication Processes and Structures. Metal-Oxide-Semiconductor (MOS) Processes. Basic Bipolar Processing. Safety. 2. Lithography. The Photo…
How Chemistry and Physics Meet in the Solid State
Abstract To make sense of the marvelous electronic properties of the solid state, chemists must learn the language of solid‐state physics, of band structures. An attempt is made here to demystify that language, drawing explicit parallels to well‐known concepts in theoretical chemistry To the joint search of physicists…
A Stable Quasicrystal in Al-Cu-Fe System
A thermodynamically stable quasicrystalline single phase with an icosahedral structure was found to be formed at an atomic composition of Al 65 Cu 20 Fe 15 in a fully annealed state as well as in a conventionally solidified state. The stable quasicrystal consisted of large grains with an average size of 0.2 mm after a…
Photochemistry of colloidal semiconductors. 20. Surface modification and stability of strong luminescing CdS particles
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of colloidal semiconductors. 20. Surface modification and stability of strong luminescing CdS particlesLubomir Spanhel, Markus Haase, Horst Weller, and Arnim HengleinCite this: J. Am. Chem. Soc. 1987, 109, 19, 5649–5655Publication Date (Print):September 1, 198…
A Continuum Model for Void Nucleation by Inclusion Debonding
A cohesive zone model, taking full account of finite geometry changes, is used to provide a unified framework for describing the process of void nucleation from initial debonding through complete decohesion. A boundary value problem simulating a periodic array of rigid spherical inclusions in an isotropically hardenin…
Low-temperature properties and localized electronic states of glasses
The basic ideas and a number of results of the theory of low-energy excitations and localized electronic states, which are responsible for the universal low-temperature anomalies in glasses and unusual electronic properties of nonmetallic glasses, primarily glassy semiconductors, are reviewed. The basic hypotheses and…
Beneficial effect of Co substitution on the magnetic properties of rapidly quenched Nd-Fe-B
Isotropic Nd15(Fe1−xCox)77B8 ribbons are produced by conventional melt spinning. For moderate Co additions the coercivity HcI increases while the remanence Jr remains almost constant. Co contents above x=0.3 lead to decreasing HcI and Jr values. The beneficial effect of Co on coercivity is ascribed to the occurrence o…