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  • Metals and Metallic Materials  (6)
  • Beyond the standard model  (2)
  • Caves diameter  (2)
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  • 1
    Publication Date: 2018-08-22
    Description: Author(s): L. J. Flores, E. A. Garcés, and O. G. Miranda One of the main purposes of long-baseline neutrino experiments is to unambiguously measure the C P violating phase in the neutrino sector within the three neutrino oscillation picture. In the presence of physics beyond the Standard Model, the determination of the C P phase will be more difficult, due ... [Phys. Rev. D 98, 035030] Published Tue Aug 21, 2018
    Keywords: Beyond the standard model
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
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  • 2
    Publication Date: 2018-08-22
    Description: Author(s): R. Martinez, R. Gaitán, J. H. Montes de Oca, and E. A. Garcés We compute the contributions to rare top decays t → c Z and t → c h 1 from the scalar sector in the two Higgs doublet model type III with C P violation, where h 1 is the Standard Model Higgs boson. The branching ratios for BR ( t → c Z ) and BR ( t → c h 1 ) are obtained as a function of the model parameters. In particul... [Phys. Rev. D 98, 035031] Published Tue Aug 21, 2018
    Keywords: Beyond the standard model
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
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  • 3
    Publication Date: 2018-06-05
    Description: With renewed interest in developing nuclear-powered deep space probes, attention will return to improving the metallurgical processing of potential nuclear fuels so that they remain dimensionally stable over the years required for a successful mission. Previous work on fuel alloys at the NASA Glenn Research Center was primarily empirical, with virtually no continuing research. Even when empirical studies are exacting, they often fail to provide enough insight to guide future research efforts. In addition, from a fundamental theoretical standpoint, the actinide metals (which include materials used for nuclear fuels) pose a severe challenge to modern electronic-structure theory. Recent advances in quantum approximate atomistic modeling, coupled with first-principles derivation of needed input parameters, can help researchers develop new alloys for nuclear propulsion.
    Keywords: Metals and Metallic Materials
    Type: Research and Technology 2002; NASA/TM-2003-211990
    Format: application/pdf
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  • 4
    Publication Date: 2019-07-10
    Description: The Bozzolo, Ferrante, and Smith (BFS) method for alloys is applied to the study of Pt deposition on Cu(100). The formation of a Cu-Pt surface alloy is discussed within the framework of previous results for Pd/Cu(100). In spite of the fact that both Pd and Pt share the same basic behavior when deposited on Cu, it is seen that subtle differences become responsible for the differences in growth observed at higher cover-ages. In agreement with experiment, all the main features of Pt/Cu(100) and Pd/Cu(100) are obtained by means of a simple modeling scheme, and explained in terms of a few basic ingredients that emerge from the BFS analysis.
    Keywords: Metals and Metallic Materials
    Type: E-13821
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  • 5
    Publication Date: 2019-07-10
    Description: The BFS (Bozzolo-Ferrante-Smith) method for alloys is applied to the study of the Cu-Pd system. A variety of issues are analyzed and discussed, including the properties of pure Cu or Pd crystals (surface energies, surface relaxations), Pd/Cu and Cu/Pd surface alloys, segregation of Pd (or Cu) in Cu (or Pd), concentration dependence of the lattice parameter of the high temperature fcc CuPd solid solution, the formation and properties of low temperature ordered phases, and order-disorder transition temperatures. Emphasis is made on the ability of the method to describe these properties on the basis of a minimum set of BFS universal parameters that uniquely characterize the Cu-Pd system.
    Keywords: Metals and Metallic Materials
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  • 6
    Publication Date: 2019-07-10
    Description: Ideally, computational modeling techniques for nanoscopic physics would be able to perform free of limitations on the type and number of elements, while providing comparable accuracy when dealing with bulk or surface problems. Computational efficiency is also desirable, if not mandatory, for properly dealing with the complexity of typical nano-strucured systems. A quantum approximate technique, the BFS method for alloys, which attempts to meet these demands, is introduced for the calculation of the energetics of nanostructures. The versatility of the technique is demonstrated through analysis of diverse systems, including multi-phase precipitation in a five element Ni-Al-Ti-Cr-Cu alloy and the formation of mixed composition Co-Cu islands on a metallic Cu(III) substrate.
    Keywords: Metals and Metallic Materials
    Format: text
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  • 7
    Publication Date: 2019-07-10
    Description: The change in site preference in NiAl(Ti,Cu) alloys with concentration is examined experimentally via ALCHEMI and theoretically using the Bozzolo-Ferrante-Smith (BFS) method for alloys. Results for the site occupancy of Ti and Cu additions as a function of concentration are determined experimentally for five alloys. These results are reproduced with large-scale BFS-based Monte Carlo atomistic simulations. The original set of five alloys is extended to 25 concentrations, which are modeled by means of the BFS method for alloys, showing in more detail the compositional range over which major changes in behavior occur. A simple but powerful approach based on the definition of atomic local environments also is introduced to describe energetically the interactions between the various elements and therefore to explain the observed behavior.
    Keywords: Metals and Metallic Materials
    Type: E-13641
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  • 8
    Publication Date: 2019-07-13
    Description: This chapter describes the role of quantum approximate methods in the understanding of complex multicomponent alloys at the atomic level. The need to accelerate materials design programs based on economical and efficient modeling techniques provides the framework for the introduction of approximations and simplifications in otherwise rigorous theoretical schemes. As a promising example of the role that such approximate methods might have in the development of complex systems, the BFS method for alloys is presented and applied to Ru-rich Ni-base superalloys and also to the NiAI(Ti,Cu) system, highlighting the benefits that can be obtained from introducing simple modeling techniques to the investigation of such complex systems.
    Keywords: Metals and Metallic Materials
    Type: E-15849 , Applied Computational Materials Modeling: Theory, Simulation and Experiment; 216-254
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  • 9
    Publication Date: 2021-05-19
    Description: El cangrejo de tierra Cardisoma guanhumi, (Latreille, 1825) habita en el Parque Nacional Ciénaga de Zapata y constituye un recurso de importancia comercial. Se determinó la densidad media de la población de C. guanhumi en las zonas de captura Guamutal, El Maíz, La Arenera y Bolanio. Se utilizó un método de estimación indirecta y se muestrearon 11 parcelas de 81 m2 en febrero/2013 para un área total de 748 m2; además, se realizaron muestreos mensuales durante la temporada de captura (mayo, junio y julio del 2013). La densidad media de cuevas varió de 0,52 a 2,23 cuevas/m2, con una media de 1,43 cuevas/m2. La zona de mayor densidad fue La Arenera con 1,81 cuevas/m2 y la menor Bolanio con 0,52 cuevas/m2. El diámetro promedio de las cuevas fue de 10,13 ± 0,34 cm, 7,74 ± 0,56 cm y 5,59 ± 0,30 cm en El Maíz, La Arenera y Guamutal respectivamente. Se observaron diferencias significativas entre los diámetros medios. Los valores de menor diámetro en Guamutal refuerzan la hipótesis de que ésta constituye una zona de reclutamiento. La talla media del cangrejo disminuye a medida que trascurre la corrida. La captura posee un esquema de “Libre Acceso” y por ello se considera al cangrejo explotado intensamente, con disminución de la talla media de captura e incremento de ejemplares por debajo de la talla mínima legal. La presencia de cangrejos está asociada a los mangles Laguncularia racemosa y Conocarpus erectus. La fauna asociada a C. guanhumi la constituyen cangrejos ermitaños (Eupagurus sp.), cocodrilos (Crocodylus rhombifer) y perros jíbaros (Canis familiares).
    Description: At the National Park, Cienaga de Zapata inhabits the land crab (Cardisoma guanhumi, Lattreille, 1825) constituting a resource of commercial importance. To determinate the average density of the population in the catchment areas Guamutal, El Maiz and La Arenera, it was used an indirect method; it were sampled 11 locations with 81 m2 at febrary/2013 for a total area of 748 m2. Also there were done monthly samples to the capture during the capture season. The caves average density varied from 0,52 to 2,23 caves/m2, with an overall average of 1,43 caves/m2. The area most densely populated was La Arenera with 1,81 caves/m2 and the lower was Bolanio with 0,52 caves/m2. The average diameter of the caves was 10,3±0,34cm, 7,74±0,56cm and 5,59±0,30cm in El Maiz, La Arenera and Guamutal respectively. There is significant difference between the mean diameters. The presence of small diameters caves in Guamutal reinforces the hypothesis that this is the main area of recruitment. The crab average size decrease along the capture season. His capture has a “Free Access” scheme and crab is considered as intensely exploited. The percentage of specimens below the legal minimum size has been increased and therefor the average size has decreased. The crab presence is associated with gender mangrove, Laguncularia racemosa and Conocarpus erectus. In the fauna associated with C. guanhumi there were observed the hermit crabs (Eupagurus sp.), crocodiles (Crocodylus rhombifer) and wild dogs (Canis familiares).
    Description: Published
    Keywords: Cardisoma guanhumi ; Densidad de población ; Diámetro de cuevas ; Flora y fauna asociada ; Cuba ; Population density ; Caves diameter ; Flora y fauna associated
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.110-124
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  • 10
    Publication Date: 2021-05-19
    Description: El cangrejo de tierra Cardisoma guanhumi, (Latreille, 1825) habita en el Parque Nacional Ciénaga de Zapata y constituye un recurso de importancia comercial. Se determinó la densidad media de la población de C. guanhumi en las zonas de captura Guamutal, El Maíz, La Arenera y Bolanio. Se utilizó un método de estimación directa y se muestrearon 11 parcelas de 81 m2 en febrero/2013 para un área total de 748 m2; además, se realizaron muestreos mensuales durante la temporada de captura (mayo, junio y julio del 2013). La densidad media de cuevas varió de 0,52 a 2,23 cuevas/m2, con una media de 1,43 cuevas/m2. La zona de mayor densidad fue La Arenera con 1,81 cuevas/m2 y la menor Bolanio con 0,52 cuevas-m2. El diámetro promedio de las cuevas fue de 10,13 +- 0,34 cm, 7,74 +- 0,56 cm y 5,59 +- 0,30 cm en El Maíz, La Arenera y Guamutal respectivamente. Se observaron diferencias significativas entre los diámetros medios. Los valores de menor diámetro en Guamutal refuerzan la hipótesis de que esta constituye una zona de reclutamiento. La talla media del cangrejo disminuye a medida que transcurre la corrida. La captura posee un esquema de "Libre Acceso" y por ello se considera al cangrejo explotado intensamente, con disminución de la talla media de captura e incremento de ejemplares por debajo de la talla mínima legal. La presencia de cangrejos está sociada a los mangles Laguncularia racemosa y Conocarpus erectus. La fauna asociada a C. guanhumi la constituyen cangrejos ermitaños (Eupagurus sp.), cocodrilos (Crocodylus rhombifer) y perros jíbaros (Canis familiares).
    Description: At the National Park, Cienaga de Zapata inhabits the land crab (Cardisoma guanhumi, Latreille, 1825) constituting a resource of commercial importance. To determinate the average density of the population in the catchment areas Guamutal, El Maíz and La Arenera, it was used and indirect method; it were sampled 11 locations with 81 m². Also there were done monthly samples to the capture during the capture season. The caves average density varied from 0.52 to 2.23 caves/m², with an overall average of 1.43 caves/m². The area most densely populated was La Arenera with 1.81 caves/m² and the lower was Bolanio with 0.52 caves/m². The average diameter of the caves was 10,13 ± 0,34 cm, 7,74 ± 0,56 cm and 5,59 ± 0,30 cm in El Maíz, La Arenera and Guamutal respectively. There is significant differences between the mean diameters. The presence of small diameter caves in Guamutal reinforce the hypothesis that this is the main area of recruitment. The crab average size decreases along the capture season. His capture has a "Free Access" scheme and crab is considered as intensely exploited. The percentage of specimens below the legal minimum size has been increased and therefor the average size has decresead. The crabs presence is associated with gender mangroves, Laguncularia racemosa and Conocarpus erectus. In the fauna associated with C. guanhumi there were observed the hermit crabs (Eupagurus sp.), crocodiles (Crocodylus rhombifer) and wild dogs (Canis familiaris).
    Description: Published
    Keywords: Cardisoma guanhumi ; Densidad de población ; Diámetro de cuevas ; Flora y fauna asociada ; Population density ; Caves diameter ; Flora and fauna associated
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.110-124
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