Deformation dynamics of SS-316 Between 1023-K TO 1223-K In The Framework of Cottrell-Stokes Law

Kocks' formalism for analysing steady state deformation data for the case where Cottrell-Stokes law is valid is extended to incorporate possible back stresses from solution and/or precipitation hardening, and dependence of pre-exponential factor on the applied stress. A simple graphical procedure for exploiting these equations is demonstrated by analyzing tensile steady state data for a type 316 austentic stainless steel for the temperature range 1023 to 1223 K. In this instance, the computed back stress values turned out to be negative, a physically meaningless result. This shows that for SS 316, deformation in this temperature regime can not be interpreted in terms of a mechanism that obeys Cottrell-Stokes law.

Studies of phosphazenes. Part 34. group 6 metal carbonyl complexes of bis(pyrazolyl)cyclotriphosphazenes

Reactions of the bis(3,5-dimethylpyrazol-1-yl)cyclotriphosphazenes gem-N3P3Ph4(C3HN2Me2)2 (L1) and N3P3(MeNCH2CH2O)2(C3HN2Me2)2 (L2) with [M(CO)6] (M = Mo or W) afford complexes of the type [M(CO)3L] (L = L1 or L2), which have been characterised by IR and NMR spectroscopic data. The structures of [Mo(CO)3L1], [W(CO)3L2] and the ligand L2 have been determined by single-crystal X-ray diffraction. The phosphazenes act as novel tridentate NNN-donor ligands with two pyrazolyl nitrogen atoms and one phosphazene ring nitrogen atom bonded to the metal atom

Vilsmeier-Haack reaction of 1-methyl-34-dihydroisoquino lines-unexpected formation of 2,3-bisdimethylamino-5,6-dihydropyrrolo [2,1-Image]isoquinolines

Novel pyrroloisoquinolines 4 are obtained from 1-methyl-3,4-dihydroisoquinolines 1 by the action of POCl3 and DMF, along with the expected mono- and dialdehydes 2 and 3 respectively and also directly from N-acetyl-2-phenethylamines.

Carbon recombination lines between 34.5 and 770 MHz toward Cassiopeia A

We present observations of low-frequency recombination lines of carbon toward Cas A near 34.5 MHz (n similar to 575) using the Gauribidanur radio telescope and near 560 MHz (n similar to 225) and 770 MHz (n similar to 205) using the NRAO 140 foot (43 m) telescope in Greenbank. We also present high angular resolution (1') observations of the C270 alpha line near 332 MHz using the Very Large Array in B-configuration. A high signal-to-noise ratio spectrum is obtained at 34.5 MHz, which clearly shows a Voigt profile with distinct Lorentzian wings, resulting from significant pressure and radiation broadening at such high quantum numbers. The emission lines detected near 332, 550, and 770 MHz, on the other hand, are narrow and essentially Doppler-broadened. The measured Lorentzian width at 34.5 MHz constrains the allowed combinations of radiation temperature, electron density, and electron temperature in the line-forming region. Radiation broadening at 34.5 MHz places a lower limit of 115 pc on the separation between Cas A and the line-forming clouds. Modeling the variation in the integrated line-to-continuum ratio with frequency indicates that the region is likely to be associated with the cold atomic hydrogen component of the interstellar medium, and the physical properties of this region are likely to be T-e = 75 K, n(e) = 0.02 cm(-3), T-R100 = 3200 K, and n(H) T-e = 10,000 cm(-3) K. Comparison of the distribution of the C270 alpha recombination line emission across Cas A with that of (CO)-C-12 and H I also supports the above conclusion.

Investigation on the High Vacuum Tribological Characteristics of Surface Treated Nuclear Grade Stainless Steel Type AISI 316 LN at 25 to 500 degrees C

Although some researchers have published friction and wear data of Plasma Nitride (PN) coatings, the tribological behavior of PN/PN Pairs in high vacuum environment has not been published so far In order to bridge this knowledge gap, tribological tests under dry conditions have been conducted on PN/PN Pairs for varying temperatures of 25, 200, 400 and 500 degrees C in high vacuum (1.6 x 10(-4) bar) environment. The PN coatings showed good wear resistance layer on the ring surface. The PN coatings were removed only from the pin surface for all the tests since it contacts at a point. The friction and wear were low at lower temperatures and it eliminated adhesion between the contact surfaces until the coating was completely removed from the pin surface. (C) 2011 Journal of Mechanical Engineering. All rights reserved.

Pulsed radio emission from the Fermi-LAT pulsar J1732-3131: Search and a possible detection at 34.5 MHz

We report our search for and a possible detection of periodic radio pulses at 34.5 MHz from the Fermi Large Area Telescope pulsar J1732-3131. The candidate detection has been possible in only one of the many sessions of observations made with the low-frequency array at Gauribidanur, India, when the otherwise radio weak pulsar may have apparently brightened many folds. The candidate dispersion measure along the sight line, based on the broad periodic profiles from �20min of data, is estimated to be 15.44 ± 0.32 pccc -1. We present the details of our periodic and single-pulse search, and discuss the results and their implications relevant to both, the pulsar and the intervening medium. © 2012 RAS.

High pressure studies on the electrical resistivity of Ge-Te-Tl glasses

The variation of electrical resistivity in the system of glasses Ge17Te83-xTlx, with (1 <= x <= 13), has been studied as a function of high pressure for pressures up to 10 GPa. It is found that the normalized electrical resistivity decreases continuously with the increase in pressure and shows a sudden drop at a particular pressure (transition pressure), indicating the presence of a transition from semiconductor to near-metallic at these pressures which are in the range 3.0-5.0 GPa. This transition pressure is seen to decrease with the increase in the percentage content of thallium due to increasing metallicity of the thallium. The transition is reversible under application of pressure and X-ray diffraction of samples recovered after pressurization show that they remain amorphous after undergoing a pressurization decompression cycle.

Prudentia Iuris, 1994, n° 34 (número completo)

Contenido: El abogado interno de empresa en la Argentina / Rodolfo Blaquier – Res Publicae / Alfredo Di Pietro – La problemática ambiental en el ámbito del MERCOSUR y el NAFTA / Dino Luis Bellorio – Hacia un modelo europeo del proceso penal / Mireille Delmas-Marty – Panorama de las relaciones Iglesia-Estado en el Río de la Plata / Néstor Daniel Villa – Notas bibliográficas

Letras, 1996, nº 34 (número completo)

Contenido: El catálogo de la literatura perdida: estado actual y porvenir / Alan Deyermond – Imágenes del sufrimiento en “Molino rojo” de Jacobo Fijman / María Amelia Arancet Ruda – El misterio de Virgilio / Héctor Ciocchini – La búsqueda del instante en “Piedra de sol”, de Octavio Paz / Sara Beatriz Fernández March – Amadís en su profecía general / Javier Roberto González – Dos obras del teatro de ideas de Vicente Martínez Cuitiño / Luis Martínez Cuitiño – Los textos germánicos en la lápida de Borges: algunas precisiones y una traducción errada / José Luis Moure – Cuestionamiento del lenguaje en la poesía en prosa argentina: Alejandra Pizarnik y María Rosa Lojo / Ana María Rodríguez Francia – Los tránsitos en la teoría y prácticas textuales en Dürrenmatt / María Luisa Punte – Notas – Reseñas bibliográficas

Sapientia, 1954, Vol. IX, nº 34 (número completo)

Contenido: Actualidad de San Agustín / La Dirección – Dialecticidad de la naturaleza humana y su problemática esencial en el pensamiento de San Agustín / Michele F. Sciacca – Los grados de perfección del alma según San Agustín / Alberto Caturelli – Determinación de la influencia neoplatónica en la formación del pensamiento de San Agustín / Octavio N. Derisi – Fundamentos de la realidad en S. Agustín / Manuel Gonzalo Casas – Notas y comentarios -- Bibliografía

Mixed-mode fracture mechanisms near the fatigue threshold of aisi-316 stainless-steel

Near threshold, mixed mode (I and II), fatigue crack growth occurs mainly by two mechanisms, coplanar (or shear) mode and branch (or tensile) mode. For a constant ratio of ΔK_I/ΔK_II the shear mode growth shows a self-arrest character and it would only start again when ΔK_I and ΔK_II are increased. Both shear crack growth and the early stages of tensile crack growth, are of a crystallographic nature; the fatigue crack proceeds along slip planes or grain boundaries. The appearance of the fracture surfaces suggest that the mechanism of crack extension is by developing slip band microcracks which join up to form a macrocrack. This process is thought to be assisted by the nature of the plastic deformation within the reversed plastic zone where high back stresses are set up by dislocation pile-ups against grain boundaries. The interaction of the crack tip stress field with that of the dislocation pile-ups leads to the formation of slip band microcracks and subsequent crack extension. The change from shear mode to tensile mode growth probably occurs when the maximum tensile stress and the microcrack density in the maximum tensile plane direction attain critical values.

Diário da Constituinte [gravação de vídeo] : [programa n. 316]

Conclusão das votações na Comissão de Sistematização. Na discussão sobre Anisitia, foram rejeitadas as propostas que previam o pagamento de atrasados aos anistiados. Uma delas foi a emenda do Deputado Brandão Monteiro (PDT-RJ), que estendia os benefícios da Anistia aos membros da Marinha e Aeronáutica. Aprovada emenda do Deputado José Maria Eymael (PDC-SP) estabelecendo que a lei ordinária irá criar uma compesação financeira para os pilotos da Força Aérea Brasileira (FAB) cassados depois de março de 1964. Aprovado destaque do Deputado José Costa (PMDB-AL), que possibilita às vítimas cassadas após 1964, recorrerem à justiça para terem seus direitos revistos. A Anistia foi também estendida aos trabalhadores do setor privado com a emenda do Deputado João Paulo Vasconcellos (PT-MG). Aprovada a emenda de Nelson Carneiro (PMDB-RJ), que regula a aplicação do parlamentarismo nos Estados. A Deputada Raquel Cândido (PFL-RO) tem a sua emenda aprovada, que cria o Código de Defesa do Consumidor. A duração do mandato do Presidente José Sarney gera polêmica entre os constituintes. Opinam os Deputados: Elizer Moreira (PFL-MA), João Carlos Barcelar (PMDB-BA) e João Hermann Neto (PMDB-SP).