Materials Literature
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En este trabajo se estudia la influencia de la presencia de rocas silíceas opalinas, procedentes de las provincias de Salamanca, Zamora y Avila, en las propiedades de los cementos mixtos fabricados con cemento portland y proporciones variables de estas rocas utilizadas como adiciones activas. La caracterización de est…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural changes accompanying hydration in nylon 6N. S. Murthy, M. Stamm, J. P. Sibilia, and S. KrimmCite this: Macromolecules 1989, 22, 3, 1261–1267Publication Date (Print):March 1, 1989Publication History Published online1 May 2002Published inissue 1 March 1989https://pu…
Abstract Homogeneous and heterogeneous phase relationships in the alkali feldspars are reviewed, and behaviour diagrams developed. Al,Si ordering is almost certainly continuous and higher order in both albite and potassium feldspar and has been established reversibly or nearly so down to below 500°C in albite and poss…
Abstract The non‐Newtonian viscosities of polymerically stabilized colloidal suspensions are usually predicted and correlated on the basis of data and scaling principles for Brownian hard spheres. Here, the specific effect of the stabilizer layer is investigated using suspensions of monodisperse PMMA particles with a…
An approximate analytical formulation is presented that allows for the calculation of acoustic pressure thresholds for transient cavitation over a variety of frequencies and host fluid parameters. Specifically, R.E. Apfel's (1986) theory is extended to include an estimate of the time delay associated with the Laplace…
Electrochemical and iodometric measurements on anodically charged thin film nickel hydroxide electrodes indicated an average nickel valence of . In situ visible spectroscopy of nickel hydroxide deposited on optically transparent electrodes featured one strong and broad absorption band with an intensity proportional to…
Polyethylene oxide(PEO)-containing nonionic polymeric surfactants were studied as a possible means to produce PEO-rich surfaces by a simple coating treatment of a common hydrophobic medical material--polyethylene. Surface tension and adsorption properties of PEO/polypropylene oxide(PPO) and PEO/polybutylene oxide(PBO)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStarburst dendrimers. 5. Molecular shape controlAdel M. Naylor, William A. Goddard III, Garry E. Kiefer, and Donald A. TomaliaCite this: J. Am. Chem. Soc. 1989, 111, 6, 2339–2341Publication Date (Print):March 1, 1989Publication History Published online1 May 2002Published ini…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilsesquioxanes as models for silica surfacesFrank J. Feher, David A. Newman, and John F. WalzerCite this: J. Am. Chem. Soc. 1989, 111, 5, 1741–1748Publication Date (Print):March 1, 1989Publication History Published online1 May 2002Published inissue 1 March 1989https://pubs.…
This paper provides an overview on the current understanding of electromigration in metals. The discussion is first focused on studies in bulk metals and alloys. This part includes a thermodynamic formulation of electromigration, a kinetic analysis of the atomic processes and a review of the theory. In addition, exper…
A phenomenon of nonlinear physics is studied in this review: the formation of characteristic, time-independent, solitary states—autosolitons (AS)—in different physical, chemical, and biological systems. The physics of As in some types of systems—systems with "positive" and "negative" thermal diffusion, uniformly gener…
Optical properties of CsCdBr 3 crystals have been investigated. Three emission bands peaking at 3.3, 2 and 1.8 eV are induced by ultraviolet excitation. Correlation with intrinsic luminescence properties of alkali halides leads to the assignment of the bands to emission from Br 2 2- centres.
The hydrogen concentration in Mg in equilibrium with H 2 gas, and the associated kinetics, were measured at 10 3 -10 5 times lower pressure than previously reported, by using UHV-prepared Mg samples with a thin Pd coating. Equilibrium can be established above a (pressure-dependent) critical temperature below which int…
It has been shown that the denaturation of phosphoglycerate kinase (PGK) can be observed not only when the solution is heated above 30 degrees C, but also when it is cooled below this temperature. The disruption of the native PGK structure upon cooling and the subsequent formation of this structure upon heating both p…
A composite system is a system formed out of different subsystems connected by interfaces. Any physical property of such a system can be described by an operator which can have a discrete matrix form or a continuous (e.g. differential) form. Some composite systems can even be formed of partly discrete and partly conti…
Abstract The effects of silane coupling agents on styrene‐butadiene rubber (SBR)‐mica composites have been studied with special reference to the technical properties and polymer‐filler interaction. Silane‐treated mica improves polymer‐filler interaction, which subsequently enhances the tensile and other technically im…
The thermal conductivity λ of phases liquid, I, II, III and the glassy crystal state of cyclohexanol has been measured using the transient hot-wire method at temperatures in the range 100–370K and at pressures up to 0·7 GPa. It was inferred from the observed temperature dependence of the thermal resistivity W (= λ-1)…
A multicomponent order parameter for surface melting is introduced which depends both on the structure of the bulk crystal and on the orientation of the crystal surface. Each order-parameter component, $\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{M}({\mathrm{Q}}^{\ensuremath{\parallel}})$, corresponds to a reciprocal-…
General occupational safety physico-chemical principles and safety flammable materials handling toxicology control measures for handling toxic substances radioactive chemicals safety with chemical engineering operations hazardous chemical processes safety in laboratories and pilot plants safety in chemical-process pla…
The dependences of the resistivity rho and the Hall voltage U H of polycrystalline Ni-Cu and Ta-Cu multi-layered thin films on the layer thickness d l are discussed. The thickness dependence of rho and U H can be well understood using a simple model in which the layers are considered as parallel resistors, whereby the…