Materials Literature
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The phase diagram of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$, as a function of hole doping $x$ and tetragonal distortion $c/a$, which consists of ferromagnetic (FM), A-, C-, and G-type antiferromagnetic (AF) states, is obtained by the first-principles band structure calculations. Effects…
Ball milling is an important method for the preparation of materials both for the investigation of fundamental physical properties and for a number of possible commercial applications. In the present report, the basic principles of ball milling are discussed. This includes a brief overview of experimental techniques a…
ICRP 74 and ICRU 57 recommended conversion coefficients for use in radiological protection for electrons and photons of energies up to 10 MeV and for neutrons up to 180 MeV. For various purposes (radiation protection around high energy accelerators, shielding calculations, air crew dose assessment, space activity) con…
The problem of localized superconductivity has motivated the preparation of Mg 1− x Cu x O solid solutions with NaCl structure and 0.01≤ x ≤0.20, as well as a study of the magnetization and magnetic susceptibility χ in the 2–400 K temperature range and in magnetic fields of up to 5 T. The temperature dependence of χ i…
Characteristics of complex defects in semiconductors are calculated by the method of minimizing the free energy for the actual crystal. The influence of the electron subsystem on the impurity solubility is considered. The modeling of solidus curves is carried out in terms of binary association and clustering.
To elucidate the secondary electron emission from tungsten surfaces of various work functions, as experimentally prepared by scandium deposition onto a W(100) surface, a Monte Carlo simulation of energy distribution of secondary electrons, N S ( E ), emitted from tungsten surfaces with various work functions has been…
Dielectric permittivity along the [111] direction has been measured as a function of temperature for a relaxor ferroelectric single crystal (PbMg1/3Nb2/3O3)0.67(PbTiO3)0.33 (PMN-33%PT). A sharp ferroelectric phase transition was observed near 425 K and 429 K for cooling and heating processes, respectively. As temperat…
This paper reviews our recent research on the solidification of several alloy systems under the action of electromagnetic field. We have developed a new solidification process, namely Electromagnetic Centrifugal Casting, by introducing a direct current magnetic field to centrifugal casting. The fundamentals of this ne…
Organoaxial gastric volvulus was detected on a I-131 whole-body scan in a 79-year-old man with thyroid cancer with metastatic disease within his lower cervical and upper thoracic spine. He had recently undergone thyroidectomy, debulking of his metastatic disease, and many I-131 treatments. During an additional I-131 a…
Abstract Ammoniation of montmorillonites pillared with polyhydroxo-complexes of Al was performed in flow conditions at 773–1073 K and monitored by IR spectroscopy. Interaction of the clay with ammonia revealed exchange of terminal and bridging -OH groups by NH 2 -, NH- and N- species depending on the reaction temperat…
In an atomic force microscopic image of the main-chain- and the side-chain-type polyimide surfaces, we have observed a variation of the surface morphology to use the rubbing depths and the rubbing times. On the rubbed polyimide surface, the polymer clusters are aligned in long chains along the rubbing direction. The t…
Abstract Continuous hydrolytic depolymerization of polyethylene terephthalate (PET) resin at high temperature and pressure was carried out in a co-rotating twin screw extruder. In this novel process, hydrolysis is achieved by injection of saturated steam at high pressure. Optimum conditions occur at relatively low scr…
The changes of electrochemical parameters on vanadium in 0.5 M NaCl solution at different potentials ranging from − 0.155 (Ecorr) to 1000 mV (SCE) are studied using the AC impedance method. It is found that the charge-transfer resistance decreases with increasing potential. At potentials ≤ 500 mV both the metal charge…
A diffusion-based numerical model was developed to predict the life of cylindrical structural elements suffering hydrogen embrittlement in the presence of residual stress fields. The formulation of the model is based on stress-assisted hydrogen diffusion from the external environment into the metallic material and on…
We report on a PE study of the electronic structure of pristine TiSe2. The experimental data are compared with results of band-structure calculations. It is confirmed that TiSe2 reveals semimetallic properties. For the first time rare-earth metals were attempted to be incorporated in situ into TiSe2. It is found that…
Effects of alloying elements on corrosion rates were investigated for 13% to 20% chromium-containing steels in wet carbon dioxide (CO2) environments without wet hydrogen sulfide (H2S) gas at 150°C to 200°C. Results showed that a reduction in carbon content and an increase in chromium, molybdenum, and nickel content im…
The deconvolution of X-ray diffraction profiles is a basic step in order to obtain reliable results on the microstructure of crystalline powder (crystallite size, lattice microstrain, etc .). A procedure for unfolding the linear integral equation h = g f involved in the kinematical theory of X-ray diffraction is propo…
Raman scattering spectra and magnetic susceptibility are measured in intercalation compounds FexNbS2 (0.159≤x≤0.325). A strong modification of Raman spectra is observed in a sample with x=0.239 (∼ 0.25) which is accompanied by 2a × 2a structural change and antiferromagnetic ordering. Some correlations between magnetic…
Electroluminescence (EL) from nanocrystalline Si (nc-Si) embedded in a single-crystal CaF 2 layer formed on a p-type Si(111) substrate has been demonstrated. Nc-Si/CaF 2 layers were grown by co-evaporation of Si and CaF 2 by molecular beam epitaxy for Si and partially ionized epitaxy for CaF 2 at a low growth temperat…
Se estudiaron cuatro Andisoles provenientes de los volcanes Hornopiren y Hualaihue o volcan Apagado, situados en Chiloe Continental, provincia de Palena, X Region (41o 53?S). Los suelos estan localizados en las faldas de los volcanes, en un relieve abrupto cubierto con una densa foresta pluvial, muy humeda, de 4.000 a…