Materials Literature
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Simple tensile tests and tensile tests after high temperature exposure of carbon fiber reinforced carbon matrix (C/C) composites have been carried out at high temperature (1000-1400 °C) in air. Types of specimens were bare, notched bare and CVD-SiC coated C/C composites. The CVD-SiC coated C/C composites were mechanic…
Electron holography study on magnetic domain structures of nanocrystalline magnetic materials was overviewed mainly based on the experimental results recently obtained by the author and his colleagues. Electron holography system which was established by modifying a conventional analytical electron microscope, i.e., in…
Americanae nace como un proyecto conjunto que surge dentro de la Red Europea de Información y Documentación sobre América Latina (REDIAL), y que ha afrontado la Biblioteca de la Agencia Española de Cooperación Internacional para el Desarrollo (AECID). Esta nueva biblioteca virtual hace más accesibles los libros digita…
New supported polypyrrole nanocomposites have been prepared and studied in this work. Self-supported sheets of fibrous cerium(IV) hydrogenphosphate (CePf) were used as the inorganic matrix, since the fibrous morphology presented by this material makes molding possible, giving a desired shape to the final polypyrrole/C…
NaxCo2O4 powders were synthesized using the polymerized complex (PC) method and then the polycrystalline samples were prepared by the spark plasma sintering (SPS) method. The microstructure and thermoelectric properties of these samples were evaluated, and their differences due to the preparation process of the polycr…
We analyze a conserved phase-field system, characterized by heat memory terms: memory kernels $a$ and $b$ account for relaxation effects in the energy constitutive equation and in the Gurtin-Pipkin heat conduction law, respectively. This model consists of a hyperbolic integrodifferential equation for the temperature $…
Abstract Durch Umsetzung von Metall‐Cyclam‐Komplexen M(Cyclam)X n mit metallorganischen Cyaniden L n M′‐CN wurden Dreikernkomplexe L n M′‐CN‐M(Cyclam)‐NC‐M′L n mit M = Mn, Fe, Co, Ni und M′ = Cr, Fe, Ru erhalten. Mit strukturanalytischen, spektroskopischen und elektrochemischen Methoden wurden sie auf elektronische We…
The digestibility of nutrients and nutritive values of cereals (barley, corn, naked oat, oat and quinor), oil meals (cotton seed meal, linseed meal and soybean meal), brans (defatted rice bran, wheat bran and wheat bran with flour) and hays (Italian ryegrass and orchardgrass) were determined by the chromic oxide index…
In this article a Preisach type density will be used to reconstruct the capacitive effects associated to a ferroelectric loop. This density will be experimentally determined using the FORC method. The small-signal capacitance, which can not be modelled by a Preisach type density, is measured simultaneously and must be…
INTRODUCTION In the past remarkable research work was performed to investigate the fouling process for systems with one single salt, mainly the so called hard salts calcium sulphate and calcium carbonate. But in practice salt solutions consist mostly of more than one single component. Up to now only few studies invest…
oly-β-hydroxybutyrate (PHB) is a biodegradable polymer which is regarded as a new environmentally compatible material. A wide variety of micro-organisms accumulate poly-β-hydroxybutyrate within cells as an intracellular storage material of carbon and energy. In this study, PHB was synthesized by Ralstonia eutropha (fo…
The critical behaviour of a binary polymer blend of polyethylene glycol 600 (PEG600) and polypropylene glycol 1000 (PPG1000) was investigated by static and dynamic light scattering. The measurements were carried out in the homogeneous one-phase region (above the critical temperature Tc) and in the two-phase region in…
The catalytic polycondensation of the lamellar organized α,ω-organo-bis-silanetriols, 4,4′-bis(trihydroxysilyl)stilbene 1H and 4,4′-bis(trihydroxysilyl)diphenylbut-1,3-diyne 2H is described. The resulting polysilsesquioxane materials X1H and X2H were compared with those obtained by sol–gel route (X1M and X2M) from the…
High-temperature thermoluminescence (TL) measurements from CaF2 : Er(0.1%) and CaF2 : Ce for different Ce concentrations are reported. Additionally, Ce- and Er-doped samples at the optimum dopant level (0.1%) are variously codoped with La, Gd, Tl, Bi or Cs through a chemical diffusion process. The presence of another…
During the manufacture of specialty yams by blending dyed cotton and raw cotton, fibers damaged by the dyeing process degrade the physical properties of the specialty yams. For a raw cotton blended with a large amount of dyed cotton, the spinnability of the specialty yarn worsens due to the disparity of the raw materi…
As part of joint U.S.–Korean International Nuclear Engineering Research Initiative (INERI) investigating methods to enhance external cooling of advanced reactor vessel under severe accident conditions, a scaling analysis has been performed to study the phenomena of external cooling of an advanced reactor vessel under…
Refraction contrast X-ray imaging experiments were conducted on acrylic resin with an artificial cylindrical hole, A7075 aluminum alloy, A6063 aluminum castings, mild steel with cracks or voids, and low alloy steel with inclusions, using a ultra-bright synchrotron radiation X-ray beam in BL24XU hutch C of SPring-8. Co…
Laboratory- and rotating- frame spin-lattice relaxation times (T(1) and T(1rho)) of (1)H and (13)C in lyophilized poly(vinylpyrrolidone) (PVP) and methylcellulose (MC) are determined to examine feasibility of using T(1) and T(1rho) as a measure of molecular motions on large time scales related to the storage stability…
Crystallized polycrystalline barium strontium titanate (Ba0.5Sr0.5TiO3) thin films have been synthesized on the titanium metal substrates by an environmentally conscious method of hydrothermal synthesis. The films were characterized by X-ray diffraction (XRD), atomic force microscopy (AFM), X-ray photoelectron spectro…
The semiconductor grade organosilicon gas trimethylsilane (Dow Corning Z3MS) can be used to deposit unique amorphous hydrogenated silicon carbide (α-SiC:H)-based alloy films that exhibit desirable properties such as chemical resistance, low stress, low permittivity, and low leakage. These film characteristics are idea…