Thermodynamic modeling of the Ni–In system
Abstract The complete nickel-indium system was thermodynamically assessed at a total pressure of 1 bar from room temperature up to liquidus temperatures. The Gibbs energies of five condensed soluti...
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Electrolytic process technologies for the production of primary magnesium
Two routes currently exist for the commercial production of primary magnesium: thermal and electrolytic. The electrolytic process accounts for 75% of the Western world's production capacity and this level is expected to increase if known magnesium projects materialize in the near future. Commercial applications of the…
Structural relationships in (Mn 1−x Zn x )Mn 2 O 4 (0 ≤ x ≤ 0.26): The “dragging effect” of the tetrahedron on the octahedron
Ten hausmannite crystals (from Ilfeld and Friedrichrode, Harz, Germany), belonging to the (Mn 1-x Zn x )Mn 2 O 4 (0 ≤ x ≤ 0.26) system (I4 1 /amd hausmannite structure type), were characterized by chemical (electron microprobe) and structural (single-crystal X-ray diffractometer) analysis. The prevailing trivalent cat…
Conducting Polymer/Silicon Heterojunction Diode for Gamma Radiation Detection
In this work, alternative heterojunction devices to be used for gamma-radiation detection are presented. The high quality silicon/polyaniline heterostructures use polyaniline thin films as an active part of the device structure. Polyaniline thin films 40 nm thick were deposited onto silicon substrates (n-type, <100>,…
The Structure of Gallium Phosphate Glasses by High-energy X-ray Diffraction
X-ray diffraction experiments are used to obtain short-range order information of gallium phosphate glasses of meta- and pyrophosphate compositions. Parameters of the first-neighbor peaks, such as coordination numbers and distances, are obtained. A strong decrease of the Ga-O coordination number from 6.0±0.2 to 4.6±0.…
Crystal Structure of Lu 4 Si 2 O 7 N 2 Analyzed by the Rietveld Method Using the Time‐of‐Flight Neutron Powder Diffraction Pattern
The crystal structure of a lutetium silicon oxynitride (Lu 4 Si 2 O 7 N 2 ) was analyzed by the Rietveld method using time‐of‐flight (TOF) neutron powder diffraction data. The compound crystallizes in a monoclinic cell, space group P 2 1 / c (No. 14‐1) with a = 7.4243(1), b = 10.2728(1), c = 10.6628(1) Å, and β= 109.7…
JANIS: A New Software for Nuclear Data Services
Janis (Java-based nuclear information software) is a display program designed to facilitate the visualisation and manipulation of nuclear data. Its objective is to allow the user of nuclear data to access numerical and graphical representations without prior knowledge of the storage format. It offers maximum flexibili…
BURNSITE, KCdCu7O2(SeO3)2Cl9, A NEW MINERAL SPECIES FROM THE TOLBACHIK VOLCANO, KAMCHATKA PENINSULA, RUSSIA
La burnsite, dont la formule ideale est KCdCu 7 O 2 (SeO 3 ) 2 Cl 9 , a ete decouverte dans une fumerolle dans la breche du Nord de la grande eruption fissurale du volcan Tolbachik (1975-1976), dans la peninsule de Kamchatka, en Russie. Elle se presente en grains rouge fonce, xenomorphes, equidimensionnels. Lui sont a…
Adsorption of Phenols onto 1,1′-Dimethyl-4,4′-bipyridinium-smectites
Abstract Adsorption of phenols (phenol and 2-naphthol) onto the 1,1′-dimethyl-4,4′-bipyridinium (methylviologen:MV2+)-smectite intercalation compounds, which were synthesized by ion exchange reactions, led to the change in the color and the basal spacing. The color change was ascribed to the formation of charge-transf…
Infrared investigation of the transformation of NO over supported Pt‐ and Rh‐based three‐way catalysts
Abstract The adsorption of NO and its reaction with CO have been investigated on Pt/Al 2 O 3 and Rh/Al 2 O 3 by in situ infrared spectroscopy. Different spectroscopic features have been observed on Rh and Pt after NO exposure at various temperatures, mainly related to the build up of positively, neutral and negatively…
Quadratic nonlinear optical coefficients of organic-inorganic crystal: 2-amino-5-nitropyridinium chloride
The quadratic nonlinear optical efficiency of the 2-amino-5-nitropyridinium dihydrogen chloride crystal is studied. The quadratic coefficients are determined by second-harmonic generation as d11=9 pm/V and d12=8 pm/V. The effective coefficients are obtained as deff=5.1 pm/V for type I and deff=9.7 pm/V for type II. Fo…
High-temperature, high-pressure optical spectroscopic study of ferric-iron-bearing tourmaline
The optical spectra of dravite (tourmaline) with an unusually high ratio of Fe 3+ to Fe 2+ and a synthetic elbaite with high Fe 3+ content were studied at high temperature (297 to 600 K) and high pressure (to 10.51 GPa) conditions. Individual absorption bands derived from paired Fe atoms were identified in the spectra…
Thermal Shock Resistance of Sintered Alumina/Silicon Carbide Nanocomposites Evaluated by Indentation Techniques
The thermal shock resistance of sintered Al 2 O 3 /1, 2.5, and 5 vol% SiC nanocomposites was studied using two indentation techniques. In the first technique, “indentation thermal shock” measurements were made of the extension of median/radial cracks around Vickers indentations after quenching from various temperature…
Synthesis of fluorosilicone having highly fluorinated alkyl side chains based on the hydrosilylation of fluorinated olefins with polyhydromethylsiloxane
Abstract Hydrosilylation of fluorinated olefins with polyhydromethylsiloxane (PHMS) in the presence of a platinum catalyst was investigated to synthesize fluorosilicone having highly fluorinated alkyl side chains (R f ; C n F 2 n +1 ). The hydrosilylation of 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10‐heptadecafluoro‐1‐dece…
New composites based on short melamine fiber reinforced epdm rubber
Abstract Melamine fibre is a new category of advanced synthetic fiber having superior heat and flame resistance with decomposition temperature above 350°C. It suitability as a reinforcing fiber for ethylene propylene diene terpolymer, abbreviated as EPDM rubber, where ‘M’ stands for polymethylene chain, was investigat…
Anderson localization of polaron states
Using the vanishing of the typical polaron tunneling rate as an indicator of the breakdown of itinerancy, we study the localization of polaron states in a generic model for a disordered polaronic material. We find that extremely small disorder causes an Anderson localization of small polaron states. However, the ratio…
Reductive Dissolution Kinetics of Al-Substituted Goethites
Abstract Several Al-substituted goethites were synthesized by hydrolysis of Fe 3+ salt solutions. The kinetics of the reductive dissolution of these goethites in dithionite-ethylenediaminetetra acetic acid (D-EDTA) was studied at pH 5.5, at 303, 323 and 333 K. The initial dissolution rate ( R ) per unit of surface are…
First-principles investigation of solute-hydrogen interaction in a α-Ti solid solution
In this paper, a first-principles method is used to calculate the interaction energy between substitutional solute atoms and hydrogen in \ensuremath{\alpha}-Ti. The results show that simple metal (SM) solute atoms are repulsive to H and therefore are detraps for H, whereas transition metal (TM) solute atoms, with smal…
Goi nia: 12 Years after the 137Cs Radiological Accident
In 1987, in the city of Goiânia, Brazil, occurred one of the worst radiological accidents ever reported. The remains of 137Cs contamination in a terrain where part of a radiotherapy unit had been manipulated in 1987 were measured in 1999-2000, and some of the results are presented here. Using the technique of gamma ra…
The effect of specific nucleation on molecular and supermolecular orientation in isotactic polypropylene
The molecular and supermolecular orientation, morphology and structural changes observed during cold drawing of injection moulded isotactic polypropylene modified by specific α, and β nucleating agents were studied by polarised photoacoustic FTIR spectroscopy, wide-angle X-ray diffraction and differential scanning cal…