Elliptical Orbit of Asteroid 1986 QE1

We present the orbital elements of asteroid QE1 (pro visional designation) identified in august 26, 1986, on a photographic plate obtained at the GPO telescope of the European Southern Observatory (ESO), La Silla, Chile, as well as the positions (AR and Dec) referred to 1950.0. Residues (0 - C) of the position in AR and Dec of the asteroid are given, both before and after applying variation in the geocentric distance.We present the orbital elements of asteroid QE1 (provisional designation) identified in august 26, 1986, on photographic plate obtained at the GPO telescope of the European Southern Observatory (ESO), La Silla, Chile, as well as the position in AR and Dec of the asteroid are given, both before and after applying variation in the geocentric distance

Cross Sections And Photoelectron Asymmetry Parameters For Photoionization Of H2o

The iterative Schwinger variational method is used to obtain cross sections and photoelectron asymmetry parameters for photoionization of the three outermost valence orbitals (1b1, 3a1, and 1b2) of H2O for photon energies from near threshold to 50 eV. A comparison of these calculated results with available experimental data is encouraging. © 1990 American Institute of Physics.9242362236

Excitation Of The 3 1,3p States Of Mg By Electron Impact

First-order many-body theory was modified to include correlation effects in the target description and used to calculate differential cross sections, coherence, and correlation parameters for the electron-impact excitation of the 3 1P and 3 3P states of magnesium at incident energies of 20, 30, 40, 50, and 100 eV. The results are analyzed and compared with available theoretical and experimental results. © 1990 The American Physical Society.4194740475

Determinação de posições de asteróides observados no Observatório Europeu Austral em setembro de 1987, La Silla, andes Chilenos, por meio de campo duplo em uma única placa fotográfica

In September 1987 we have observed minor planets at La Silla, ESO, with the GPO astrometric refractor (D = 40 cm; F=400 cm). Measures and reductions were performed at the Observatório do Valongo (UFRJ) with the Ascorecord measuring machine (0,1µ) and by means of five reference stars (SAO Star Catalogue - 1950,0). By the first time, double star field were used for saving time and photographic material.In September 1987 we have observed minor planets at La Silla, ESO, with the GPO astrometric refractor (D = 40 cm; F=400 cm). Measures and reductions were performed at the Observatório do Valongo (UFRJ) with the Ascorecord measuring machine (0,1µ) and by means of five reference stars (SAO Star Catalogue - 1950,0). By the first time, double star field were used for saving time and photographic material

Consanguinidad, endogamia y exogamia en Holguín entre los siglos XVIII y XIX

pareja en el proceso de formación de matrimonios y familias. Se considera que en una sociedad simétrica debe existir un equilibrio entre los procesos de endogamia y exogamia No se cuenta con un análisis detallado de la endogamia, consanguinidad y exogamia en Holguín entre los siglos XVIII y XIX. Objetivo: Evaluar la consanguinidad, endogamia y exogamia en Holguín entre los siglos XVIII y XIX. Métodos: Se emplearon varias fuentes documentales y la confiabilidad de la información se aseguró a través de la triangulación de fuentes. Resultados: El índice de consanguinidad por dispensas matrimoniales correspondientes al periodo de 1751 a 1850 fue de 11,07, mientras que la endogamia fue del 66,8%. El índice de exogamia en el periodo estudiado fue de 0,5, mientras que el 18,5% de los matrimonios analizados correspondieron a matrimonios con exogamia regional, y el 14,7% a matrimonios con exogamia no regional. Conclusiones: Se demostró la ocurrencia de altos niveles de consanguinidad y de endogamia, así como bajos niveles de exogamia, en la población holguinera de la segunda mitad del siglo XVIII y la primera mitad del siglo XIX. Introduction: Consanguinity, endogamy and exogamy are phenomena derived from the couple choosing process and from the formation of marriages and family. It is considered that in a balanced society must be an equilibrium between endogamic and exogamic orientations. It is not known the endogamy or exogamic orientation, neither the consanguinity levels, in Holguín society between the XVIII and XIX centuries. Aim: To characterize the consanguinity, endogamy and exogamy in Holguín society between the XVIII and XIX centuries, an historical demographic study was conducted. Methods: Several documentary sources were used and the reliability of the information was assured through the triangulation of sources. Results: The consanguinity index derived from marital dispensations corresponding to the period from 1751 to 1850 was 11,07; while endogamy was of 66,8%. The exogamy index for the period was 0,5; about 18,5% of the studied marriages corresponded to marriages with regional exogamy, and 14,7% to marriages with non-regional exogamy. Conclusion: It is concluded that Holguin population of the second half of the XVIII century and the first half of the XIX century was characterized by the occurrence of high levels of consanguinity and endogamy, as well as low levels of exogamy

Determinação de posições precisas de asteróides: ESO, La Silla, fevereiro 1986

This paper refers to the observation of asteroids at the European Southern Observatory - ESO, La Silla. Chile, made by H. Debehogne (Observatoire Royal de Belgique), during february/march, 1986. The G.P.O. refractor (D= 40 cm; F= 4 m), was used. The plates were reduced at the Observatório do Valongo, UFRJ, using the Ascorecord coordinatograph and the Burroughs 6700 computer of the Núcleo de Computação Eletrônica, of the same University.Durante a missão do Observatório Real da Bélgica e do Observatório do Valongo (UFRJ) no Observatório Austral (ESO) em La Silla, Andes chilenos, em feveveiro/março de 1986, o astrônomo H. Debehogne utilizando o telescópio refrator GPO (D = 40 cm; F=4m) teve a ocasião de registrar a posição de asteróides já classificados e de outros ainda não identificados. Na redução das observações foi empregado o método "Uccle: Cinco Estrelas" e que opera com as Dependências e os Mínimos Quadrados

Comparison of Microstructures and Mechanical Properties for Solid Cobalt-Base Alloy Components and Biomedical Implant Prototypes Fabricated by Electron Beam Melting

The microstructures and mechanical behavior of simple, as-fabricated, solid geometries (with a density of 8.4 g/cm3), as-fabricated and fabricated and annealed femoral (knee) prototypes all produced by additive manufacturing (AM) using electron beam melting (EBM) of Co-26Cr-6Mo-0.2C powder are examined and compared in this study. Microstructures and microstructural issues are examined by optical metallography, SEM, TEM, EDS, and XRD while mechanical properties included selective specimen tensile testing and Vickers microindentation (HV) and Rockwell C-scale (HRC) hardness measurements. Orthogonal (X-Y) melt scanning of the electron beam during AM produced unique, orthogonal and related Cr23C6 carbide (precipitate) cellular arrays with dimensions of ~2μm in the build plane perpendicular to the build direction, while connected carbide columns were formed in the vertical plane, parallel to the build direction.Mechanical Engineerin

Microstructure Architecture Development in Metals and Alloys By Additive Manufacturing Using Electron Beam Melting

The concept of materials with controlled microstructural architecture (MCMA) to develop and fabricate structural materials with novel and possibly superior properties and performance characteristics is a new paradigm or paradigm extension for materials science and engineering. In the conventional materials science and engineering paradigm, structure (microstructure), properties, processing, and performance features are linked in the development of desirable materials properties and performance through processing methodologies which manipulate microstructures. For many metal or alloy systems, thermomechanical treatment combining controlled amounts of plastic deformation with heat treatment or aging cycles can achieve improved mechanical properties beyond those attainable by conventional processing alone (such as rolling or forging for example) through controlled microstructure development. In this paper we illustrate a new concept involving the fabrication of microstructural architectures by the process development and selective manipulation of these microstructures ideally defining material design space. This allows for the additional or independent manipulation of material properties by additive manufacturing (AM) using electron beam melting (EBM). Specifically we demonstrate the novel development of a carbide (M23C6) architecture in the AM of a Co-base alloy and an oxide (Cu2O) precipitate-dislocation architecture in the AM of an oxygen-containing Cu. While more conventional processing can produce various precipitate microstructures in these materials, EBM produces spatial arrays of precipitate columns or columnar-like features often oriented in the build direction. These microstructural architectures are observed by optical microscopy and scanning and transmission electron microscopy. Prospects for EBM architecture development in precipitation-hardenable Al alloys is also discussed. In the EBM build process using precursor powders, the electron beam parameters (including beam focus, scan speed and sequencing) produce localized, requisite thermodynamic regimes which create or organize the precipitate-related spatial arrays. This feature demonstrates the utility of AM not only in the fabrication of complex components, but also prospects for selective property design using CAD for MCMA development: a new or extended processing-microstructure-property-performance paradigm for materials science and engineering in advanced manufacturing involving solid free-form fabrication (SFF).Mechanical Engineerin

Studies Of The Photoionization Cross Sections Of Ch4

We present cross sections and asymmetry parameters for photoionization of the 1t2 orbital of CH4 using static-exchange continuum orbitale of CH4 + to represent the photoelectron wave function. The calculations are done in the fixed-nuclei approximation at a single internuclear geometry. To approximate the near-threshold behavior of these cross sections, we assumed that the photoelectron spectrum is a composite of three electronic bands associated with the Jahn-Teller components of the distorted ion. The resulting cross sections reproduce the sharp rise seen at threshold in the experimental data and are in good agreement with experiment at higher energy. The agreement between the calculated and measured photoelectron asymmetry parameters is, however, less satisfactory. © 1988 American Institute of Physics.8952998300

Stokes Parameters And Rovibrationally Resolved Cross Sections For The X1∑g +(v = 0, N = 1) → D3iiu -(v = 0, N = 1) Excitation In H2

We report for the first time the calculation of Stokes parameters and state-to-state rovibrationally resolved differential cross sections for the excitation X1∑g +(v = 0, N = 1) → d3IIu -(v = 0, N = 1) in H2 by electron impact at 25 eV. Comparison with the only available experimental data is encouraging.71111701170