Noticias
Equipo Editorial1987-03-01Materiales de Construccion
Materials Literature
文献浏览
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Noticias
Resistencia química del hormigón. XXVII. Contribución al estudio del sistema: cemento P-550-ARI hidratado-agua desionizada
In this work, which is the following of others, the performance of a portland cement of a high initial resistance (P-550-ARI) —with a calculated content (Bogue) of 39,2% of C3S, of 25,7% of C2S, of 9,9% of C3A, of 12,0% of C4AF and of 6,9% of CaSO4 — is studied when it is submitted to the action of deionized water run…
Modificación de Betún-Venezuela por reacción de Friedel y Crafts
In this work, a Venezuelan-bitumen of newtonian nature was modified by Friedel and Crafts reaction, changing it in new materials that present pseudoplastic characteristics, with very different properties from the original product. These new materials are harder and have less thermical susceptibility and allow us to us…
Effect of cement type and cement proportion in the corrosion rate of rebars embedded in carbonated mortar
The inexistence of quantitative data on steel behaviour in carbonated mortar and concrete have driven us to carry out a serie of tests to know the kinetic of the corrosion rebars. Polarization Resistance was the technique used to determine the corrosion rate of the rebars. In the present tests a first study with morta…
Electrooxidation of aromatics to polymer films
Abstract This report describes the electrochemical preparation and properties of polyaniline films prepared on a bare platinum electrode and on electrodes precoated with a thin film of inert polymer. Films were prepared and studied in several aqueous acid electrolytes including sulfuric, hydrochloric, nitric, trifluor…
Thermal DeNOx Controlling nitrogen oxides emissions by a noncatalytic process
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal DeNOx Controlling nitrogen oxides emissions by a noncatalytic processRichard K. LyonCite this: Environ. Sci. Technol. 1987, 21, 3, 231–236Publication Date (Print):March 1, 1987Publication History Published online1 May 2002Published inissue 1 March 1987https://pubs.ac…
The aperiodic crystal picture and free energy barriers in glasses
The aperiodic crystal picture associates the glass transition with freezing into a nonperiodic structure. Dynamics in the glassy state involves activated jumps between different aperiodic free energy minima. Activation barriers may be estimated through the use of freezing theory and the theory of dense solids. The res…
Dual emission from an ortho-metalated iridium(III) complex
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDual emission from an ortho-metalated iridium(III) complexK. A. King and R. J. WattsCite this: J. Am. Chem. Soc. 1987, 109, 5, 1589–1590Publication Date (Print):March 1, 1987Publication History Published online1 May 2002Published inissue 1 March 1987https://pubs.acs.org/doi/…
Short-range order and concentration fluctuations in binary molten alloys
The quasi-chemical theory and the quasi-lattice theory are discussed with a view to obtaining information about concentration fluctuations, S CC (0), and the short-range order parameter, α 1 , for regular and compound-forming molten alloys. The influence of the coordination number z and the interchange energy ω on the…
Thermodynamic study of lanthanide complexes of 1,4,7-triazacyclononane-N,N',N"-triacetic acid and 1,4,7,10-tetraazacyclododecane-N,N',N",N'''-tetraacetic acid
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamic study of lanthanide complexes of 1,4,7-triazacyclononane-N,N',N"-triacetic acid and 1,4,7,10-tetraazacyclododecane-N,N',N",N'''-tetraacetic acidW. P. Cacheris, S. K. Nickle, and A. D. SherryCite this: Inorg. Chem. 1987, 26, 6, 958–960Publication Date (Print):Ma…
Electro-optic, linear, and nonlinear optical properties of KDP and its isomorphs
The electro-optic, linear, and nonlinear optical properties of KDP and its isomorphs are reviewed. Figures of merit for doubling and tripling by sum-frequency generation are presented and used to compare and contrast these crystals for nonlinear optics devices. Current research areas, such as high-average-power applic…
Influence of structural and morphological factors on the mechanical properties of the polyethylenes
Abstract Force‐length relations at ambient temperature have been determined for a set of polyethylenes which represent a wide range in molecular weight and molecular constitution. Taking advantage of previous work from this laboratory, samples have been prepared in such a manner that the important independent structur…
Analysis of chemical reaction kinetics using a distribution of activation energies and simpler models
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis of chemical reaction kinetics using a distribution of activation energies and simpler modelsR. L. Braun and A. K. BurnhamCite this: Energy Fuels 1987, 1, 2, 153–161Publication Date (Print):March 1, 1987Publication History Published online1 May 2002Published inissue…
Deconvolution as a correction for photoelectron inelastic energy losses in the core level XPS spectra of iron oxides
Abstract In this paper core level XPS spectra of polycrystalline Fe metal and several oxides are corrected by deconvolution using the ratio method for energy loss effects and spectral broadening due to both an achromatic x‐ray source and finite analyzer resolution. These ideas are applied to the XPS spectra of Fe, FeO…
Water soluble conducting polymers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWater soluble conducting polymersA. O. Patil, Y. Ikenoue, Fred Wudl, and A. J. HeegerCite this: J. Am. Chem. Soc. 1987, 109, 6, 1858–1859Publication Date (Print):March 1, 1987Publication History Published online1 May 2002Published inissue 1 March 1987https://pubs.acs.org/doi…
Encyclopedia of Materials Science and Engineering
This major eight-volume reference work provides the first unified treatment of an important interdisciplinary field.
In situ composites: Blends of isotropic polymers and thermotropic liquid crystalline polymers
Abstract Melt blending of a variety of conventional isotropic polymers (both crystalline and amorphous) has shown that considerable reinforcement is obtained from the inclusion of thermotropic liquid crystalline polymers (LCP). When the LCP is a minor component it forms highly elongated domains parallel to the flow di…
Formation of dispersed phase in incompatible polymer blends: Interfacial and rheological effects
Abstract The formation of dispersed phase in blends of incompatible polymers during melt extrusion with a co‐rotating twin screw extruder was studied, using nylon and polyester as the matrix and ethylene‐propylene rubbers as the dispersed phase. A master curve is obtained, i.e., G η m α/γ = 4 p ±0.84 , where G is the…
Rothemund and Adler-Longo reactions revisited: synthesis of tetraphenylporphyrins under equilibrium conditions
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRothemund and Adler-Longo reactions revisited: synthesis of tetraphenylporphyrins under equilibrium conditionsJonathan S. Lindsey, Irwin C. Schreiman, Henry C. Hsu, Patrick C. Kearney, and Anne M. MarguerettazCite this: J. Org. Chem. 1987, 52, 5, 827–836Publication Date (Pri…
Dislocation-mechanics-based constitutive relations for material dynamics calculations
An improved description of copper- and iron-cylinder impact (Taylor) test results has been obtained through the use of dislocation-mechanics-based constitutive relations in the Lagrangian material dynamics computer program EPIC-2. The effects of strain hardening, strain-rate hardening, and thermal softening based on t…