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El uso de las piedras de corte en los monumentos y en la construcción. 1. Areniscas y calizas
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The significance of curing in the future corrosion resistance of concrete structures
Steel in contact with fresh concrete is covered by a layer of passivating oxydes due to the alkaline nature of the pore solution. The presence of oxygen plays an important role in this passivation process as well as in the corrosión one when is developped due to the ingress of aggressives, such as, chloride ions. In t…
A study on fiy ash: ballistic separation of a fly ash
The object of this study is the characterization of several sized fractions from a "spanish fly ash" originating in the thermoelectric power plant in Andorra (Teruel). Physical (size distributions, densities) chemical (chemical composition) and mineralogical characteristics (X-ray diffractograms and infrared spectra)…
Noticias
Third-order optical nonlinearities and their wavelength dispersion in thin films of conjugated rigid-rod polyquinolines and a random copolymer
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThird-order optical nonlinearities and their wavelength dispersion in thin films of conjugated rigid-rod polyquinolines and a random copolymerAshwini K. Agrawal, Samson A. Jenekhe, Herman Vanherzeele, and Jeffrey S. MethCite this: Chem. Mater. 1991, 3, 5, 765–768Publication…
Study of water-repellent treatments applied on limestone from Andalusian Cathedrals
Five types of stone used in Andalusian Cathedrals have been treated with different water-repellent treatments, to evaluate the effects of this products. The stones studied are limestone, calcarenite and dolomite; the products applied are organosilicones and acrylics. In this work properties related with water access a…
Scaling theory for the glass transition
The technologically important viscoelastic structural properties of glasses are largely determined at the glass transition, where the supercooled liquid falls out of equilibrium. We examine recent experimental evidence that there is a thermodynamic critical point underlying this transition. We argue that the behavior…
Magnetic dipole transitions as standards for Judd–Ofelt parametrization in lanthanide spectra
It is shown that the sum of the intensities for magnetic dipole transitions between crystal-field components of two free-ion levels in lanthanide spectra is almost independent of the symmetry of the environment. A mean theoretical sum value of 18×10−7𝒟2, 94×10−7𝒟2, and 9×10−7𝒟2 for, respectively, the 5D1←7F0, 5D0←7F1,…
X7R Multilayer Ceramic Capacitors with Nickel Electrodes
Electrical properties and microstructures of a holmium-doped (Ba 1.01 Mg 0.01 )O 1.02 (Ti 0.98 Zr 0.02 )O 2 system were studied. Additions of Ho 2 O 3 had little effect in preventing the dielectrics from reducing at high temperature, but the resistivity at low temperature increased with increasing amount of Ho 2 O 3 w…
The Cahn–Hilliard gradient theory for phase separation with non-smooth free energy Part I: Mathematical analysis
A mathematical analysis is carried out for the Cahn–Hilliard equation where the free energy takes the form of a double well potential function with infinite walls. Existence and uniqueness are proved for a weak formulation of the problem which possesses a Lyapunov functional. Regularity results are presented for the w…
Atlas of time-temperature diagrams for irons and steels
The most comprehensive collection of time-temperature diagrams for irons and steels ever collected. Between this volume and its companion, Atlas of Time Temperature Diagrams for Nonferrous Alloys, you'll find the most comprehensive collection of time-temperature diagrams ever collected. Containing both commonly used c…
Conjugated aromatic poly(azomethines). 1. Characterization of structure, electronic spectra, and processing of thin films from soluble complexes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConjugated aromatic poly(azomethines). 1. Characterization of structure, electronic spectra, and processing of thin films from soluble complexesChen Jen Yang and Samson A. JenekheCite this: Chem. Mater. 1991, 3, 5, 878–887Publication Date (Print):September 1, 1991Publication…
Stereocomplex formation between enantiomeric poly(lactic acid)s. 4. Differential scanning calorimetric studies on precipitates from mixed solutions of poly(D-lactic acid) and poly(L-lactic acid)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereocomplex formation between enantiomeric poly(lactic acid)s. 4. Differential scanning calorimetric studies on precipitates from mixed solutions of poly(D-lactic acid) and poly(L-lactic acid)Hideto Tsuji, Suong Hyu Hyon, and Yoshito IkadaCite this: Macromolecules 1991, 24…
Air-filled proteinaceous microbubbles: synthesis of an echo-contrast agent.
Air-filled microbubbles are in clinical use as echo-contrast agents for sonographic applications. The synthesis of aqueous suspensions of air-filled proteinaceous microbubbles involves the ultrasonic irradiation of aqueous protein solutions in the presence of O2. Yields and size distributions of human and bovine serum…
Oxidation and protection in copper and copper alloy thin films
The oxidation kinetics of copper thin films have been studied at temperatures below 200 °C in air. The protection of copper from oxidation can be achieved by alloying copper film with Ti, Pd, Cr, or Al. The influence of the composition and microstructure to the oxidation rate has been studied. The compounds Cu3Ti, Cu3…
Thermal Stresses in Materials with Temperature-Dependent Properties
The present review on thermal stresses in materials with temperature-dependent properties focuses on papers published after 1980. The thermal and mechanical properties in materials subjected to thermal loads due to high temperature, high gradient temperature, and cyclical changes of temperature are dependent on temper…
Molecular-dynamics study of a supercooled two-component Lennard-Jones system
Molecular-dynamics (MD) simulations have been carried out on a two-component Lennard-Jones system, quenched into supercooled and amorphous states. Two different regimes of viscous behavior are found in the time window accessible in MD simulation studies (of the order of nanoseconds if units appropriate for argon are u…
Acid Corrosion Inhibition of Nickel by 2-(Triphenosphoranylidene) Succinic Anhydride
The corrosion inhibition of nickel in acid solutions by 2-(triphenyl phosphoranylidene) succinic anhydride (2TPSA) has been investigated using DC and AC techniques. The percentage inhibition was up to 85 percent at a concentration of 400 μ/W of 2TPSA. The inhibitor used was found (1) to shift the corrosion potential t…
Structural analysis of polymer-protected palladium/platinum bimetallic clusters as dispersed catalysts by using extended x-ray absorption fine structure spectroscopy
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural analysis of polymer-protected palladium/platinum bimetallic clusters as dispersed catalysts by using extended x-ray absorption fine structure spectroscopyNaoki Toshima, Masafumi Harada, Tetsu Yonezawa, Kakuta Kushihashi, and Kiyotaka AsakuraCite this: J. Phys. Che…