Materials Literature
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We have analytically computed the energy-loss probability of a fast electron passing near a locally anisotropic hollow nanotube, in the nonretarded approximation. Numerical simulations have been performed in the low loss (below 50 eV) region, and a good agreement with experimental spatially resolved electron energy-lo…
Se han determinado algunos efectos de la exposición prolongada a temperaturas y presiones altas, características del transporte del vapor en una central térmica, en las conducciones de acero 12HMF GOST (13CrMo44 DIN) Cr-Mo de baja aleación, a nivel macro y microestructural a través de ensayos mecánicos y microscopia ó…
An equivalent diagram with localized constants has been created to represent the two winding transformer. The equivalent diagram with localized constants is practically independent of the transformer construction. Only the numeric constants change from one component to another. This circuit can be introduced into conv…
An enumeration and discussion of the physical, thermal, mechanical and magnetic problems of Alnico permanent magnet materials are presented. Some of the milestones in the development of this class of alloys are shown. The physical properties of cast and sintered Alnico permanent magnets are presented, together with th…
A comparison is presented between two of the most significant international standards for short-circuit calculation: the IEC 909 Standard and the ANSI/IEEE C37.010-1979. The ANSI standard is more oriented toward breaker selection while the IEC standard gives general guidelines for short-circuit current computation. A…
The evolution of interface structure of $\ensuremath{\alpha}\ensuremath{-}{\mathrm{F}\mathrm{e}/\mathrm{N}\mathrm{d}}_{2}{\mathrm{Fe}}_{14}\mathrm{B}$ nanocomposites prepared by crystallization of amorphous ${\mathrm{Nd}}_{9}{\mathrm{Fe}}_{83}{\mathrm{Co}}_{3}{\mathrm{B}}_{5}$ has been investigated by employing positr…
Our first-principles computations indicate that the clean Al2O3/Al interface is relatively weak-weaker than bulk Al. Fracture experiments reveal that the interface is relatively strong with observed failure in bulk Al, however. This paradox is resolved via doping effects of the common impurity C. We have found that on…
Abstract The influence of the molecular weight of the dispersed phase of ethylene–propylene rubber modified isotactic polypropylene (iPP/EPR) reactor blends was studied in a systematic way by varying their intrinsic viscosity (IV) from 1.7 to 6 dg/L while keeping the matrix melt flow rate (MFR) constant. Standard Char…
The optic, electro-optic, and dielectric properties of antiferroelectric liquid crystals (AFLCs) are analyzed and discussed in terms of the local tilt plane orientation. We show that the so-called pretransitional effect is a combination of two different electro-optic modes: the field-induced antiphase distortion of th…
Motivated by the experimentally observed shear-induced destabilization and reorientation of smectic-A-like systems, we consider an extended formulation of smectic-A hydrodynamics. We include both, the smectic layering (via the layer displacement u and the layer normal p(circ)) and the director n(circ) of the underlyin…
Al doped zinc oxide thin films with different electrical and optical properties have been developed by both non-reactive and reactive rf-magnetron sputtering in Ar and Ar+H 2 atmospheres, respectively. The thin films prepared under Ar+H 2 gas ambient at substrate temperatures of 100°C and 300°C show high conductivity…
Abstract The degradation of polypropylene–polyethylene copolymers (which were used to make the seats for the Olympic stadium in Barcelona, Spain), in response to natural aging for 2.5 years and artificial aging for 5000 h in a xenon lamp chamber, was studied. The extent of the various photoreactions, including the for…
The aim of this research was to prepare mononuclear ruthenium corroles, because of the well-documented potency of analogous porphyrin complexes in catalysis. The syntheses of the mononuclear nitrosyl complexes [Ru(tpfc)(NO)] and [Ru(tdcc)(NO)] (tpfc=trianion of 5,10,15-tris(pentafluorophenyl)corrole, tdcc=trianion of…
The photoconductivity of TlGaSe 2 layered single crystals are investigated in the temperature range 78–300 K. Both the ac-photoconductivity (ac-PC) and the spectral distribution of the photocurrent were studied at different values of light intensity, applied voltage and temperature. Dependences of carrier lifetime on…
Abstract This work aimed to examine the effect of addition of tire‐tread reclaimed rubber on the properties of two natural rubber (NR) compounds with respect to the reclaimed rubber concentration and mastication time, the properties of interest including rheological and cure characteristics, physical and mechanical pr…
Photoluminescence and structural properties of cadmium sulphide thin films grown by different techniques, J Aguilar-Hernández, G Contreras-Puente, A Morales-Acevedo, O Vigil-Galán, F Cruz-Gandarilla, J Vidal-Larramendi, A Escamilla-Esquivel, H Hernández-Contreras, M Hesiquio-Garduño, A Arias-Carbajal, M Chavarría-Cast…
Electrical treeing is of interest to the electrical generation, transmission and distribution industries as it is one of the causes of insulation failure in electrical machines, switchgear and transformer bushings. In this paper a deterministic electrical tree growth model is described. The model is based on electrost…
The [M(4)(II)L(4)](8+) [2 x 2]-grid-type complexes 1-8 present a set of features of particular interest for potential applications. All complexes exhibit multiple reduction levels at low reduction potentials paired with rather high stability. The modulation of the reduction potentials is possible by introduction of ap…
In an aqueous solution at room temperature, 1,4,8,11-tetraazacyclotetradecane-1,8-bis(methylphosphonic acid) (H(4)L(1)) and Cu(I) (I) form a pentacoordinated (pc) complex, pc-[Cu(L(1))](2-), exhibiting conformation I of the cyclam ring. At high temperature, the complex isomerises to a hexacoordinated isomer, trans-O,O…
The thermally induced motion of nanometer-sized surfactant micelles in water is used to create strong attractive forces between micron-sized disks of wax in a mixed aqueous dispersion of microdisks and microspheres. The short-ranged attractive force due to the depletion of micelles from between the microdisks is much…