172,091 research outputs found
Libro Rojo de Peces Dulceacuícolas de Colombia (2012)
No full textEn el marco del Plan Operativo Anual (2010 – 2011 - 2012) del Programa de Biología de la Conservación y Uso de la Biodiversidad del Instituto de Investigación de Recursos Biológicos Alexander von Humboldt, se llevó a cabo la actualización del Libro Rojo de peces dulceacuícolas de Colombia o proceso de evaluación del riesgo de extinción y evolución del estado de conservación de las especies de peces dulceacuícolas, como también es conocido. Esta iniciativa se llevó a cabo con el aval del Ministerio de Ambiente, Vivienda y Desarrollo Territorial – MAVT (hoy Ministerio de Ambiente y Desarrollo Sostenible – MADS) y la participación del Instituto de Ciencias Naturales de la Universidad Nacional de Colombia, WWF Colombia, y la Universidad de Manizales. En este proceso contribuyeron más de 50
investigadores, vinculados a unas 30 instituciones académicas, gubernamentales y no gubernamentales.Bogotá, D. C
Libro rojo de peces dulceacuícolas de Colombia (2012)
No full textEn el marco del Plan Operativo Anual (2010 – 2011 - 2012) del Programa de Biología de la Conservación y Uso de la Biodiversidad del Instituto de Investigación de Recursos Biológicos Alexander von Humboldt, se llevó a cabo la actualización del Libro Rojo de peces dulceacuícolas de Colombia o proceso de evaluación del riesgo de extinción y evolución del estado de conservación de las especies de peces dulceacuícolas, como también es conocido. Esta iniciativa se llevó a cabo con el aval del Ministerio de Ambiente, Vivienda y Desarrollo Territorial – MAVT (hoy Ministerio de Ambiente y Desarrollo Sostenible – MADS) y la participación del Instituto de Ciencias Naturales de la Universidad Nacional de Colombia, WWF Colombia, y la Universidad de Manizales. En este proceso contribuyeron más de 50
investigadores, vinculados a unas 30 instituciones académicas, gubernamentales y no gubernamentales.Bogotá, D. C
Proceedings of the E-MRS conference, symposium G substrates of wide bandgap materials - Preface
No full text[Report to Chief J. E. Curry, by an unknown author #1]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
[Report to Chief J. E. Curry, by an unknown author #2]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
Sublittoral soft bottom communities and diversity of Mejillones Bay in northern Chile (Humboldt Current upwelling system)
No full textThe macrozoobenthos of Mejillones Bay (23°S; Humboldt Current) was quantitatively investigated over a 7-year period from austral summer 1995/1996 to winter 2002. About 78 van Veen grab samples taken at six stations (5, 10, 20 m depth) provided the basis for the analysis of the distribution of 60 species and 28 families of benthic invertebrates, as well as of their abundance and biomass. Mean abundance (2,119 individuals m-2) was in the same order compared to a previous investigation; mean biomass (966 g formalin wet mass m-2), however, exceeded prior estimations mainly due to the dominance of the bivalve Aulacomya ater. About 43% of the taxa inhabited the complete depth range. Mean taxonomic Shannon diversity (H', Log e) was 1.54 ± 0.58 with a maximum at 20 m (1.95 ± 0.33); evenness increased with depth. The fauna was numerically dominated by carnivorous gastropods, polychaetes and crustaceans (48%). About 15% of the species were suspensivorous, 13% sedimentivorous, 11% detritivorous, 7% omnivorous and 6% herbivorous. Cluster analyses showed a significant difference between the shallow and the deeper stations. Gammarid amphipods and the polychaete family Nephtyidae characterized the 5-mzone, the molluscs Aulacomya ater, Mitrella unifasciata and gammarids the intermediate zone, while the gastropod Nassarius gayi and the polychaete family Nereidae were most prominent at the deeper stations. The communities of the three depth zones did not appear to be limited by hypoxia during non-El Niño conditions. Therefore, no typical change in community structure occurred during El Niño 1997–1998, in contrast to what was observed for deeper faunal assemblages and hypoxic bays elsewhere in the coastal Humboldt Current system
ROJO GÓMEZ, Javier (Lic.)
No full textLetter sent by Mr. Javier Rojo Gómez, Head of the Department of the Federal District, to General Plutarco Elías Calles, telling him that he did everything possible to heed his recommendation for J. Ignacio Gómez. Letter sent by General Plutarco Elías Calles to Javier Rojo Gómez, Head of the Department of the Federal District, recommending Margarita González de la Vega, who wishes to apply for a job. Letter sent by General Plutarco Elías Calles to Javier Rojo Gómez, Head of the Department of the Federal District, recommending Adolfo V. Castellanos, who held the position of Inspector Accountant of the Treasury of the Federal District, and stopped working in that position on the occasion of the disappearance of the Office of Accounting Studies. / Carta que envía el licenciado Javier Rojo Gómez, Jefe del Departamento del Distrito Federal, al general PEC diciéndole que hace todo lo posible por atender a su recomendado, el señor J. Ignacio Gómez. Carta que envía el general PEC al licenciado Javier Rojo Gómez, Jefe del Departamento del Distrito Federal, recomendándole a la señorita Margarita González de la Vega, quien desea solicitarle un empleo. Carta que envía el general PEC al licenciado Javier Rojo Gómez, Jefe del Departamento del Distrito Federal, recomendándole al señor Adolfo V. Castellanos, quien desempeñaba el puesto de Inspector Contador de la Tesorería del Distrito Federal, habiendo dejado de trabajar en ese puesto con motivo de la desaparición de la Oficina de Estudios Contables
Impact of the parton distribution function uncertainties on the measurement of the W boson mass at the Tevatron and the LHC
No full textWe study at a quantitative level the impact of the uncertainties on the value of the W boson mass measured at hadron colliders due to: i) the proton parton distribution functions (PDFs), ii) the value of the strong coupling constant αs and iii) the value of the charm mass used in the PDF determination. The value of the W boson mass is extracted, by means of a template fit technique, from the lepton-pair transverse mass distribution measured in the charged current Drell-Yan process. We study the determination of mW at the Tevatron and at the LHC with 7 and 14 TeV of center-of-mass energy in a realistic experimental setup. The analysis has been done at the Born level using the event generator HORACE and at NLO-QCD using the event generators DYNNLO and RESBOS. We consider the three global PDF sets, CTEQ6.6, MSTW2008, and NNPDF2.1. We estimate that the total PDF uncertainty on mW is below 10 MeV both at the Tevatron and at the LHC for all energies and final states. We conclude that PDF uncertainties do not challenge a measurement of the W boson mass at the level of 10 MeV accuracy
Shadowgraphy of the end-effects regime produced by clustered rockets
No full textThe plume produced by a cluster of two high area-ratio thrust optimized parabolic contour nozzles is visualized by way of retroreflective shadowgraphy. Both steady and transient operations of the nozzles (start-up and shut-down) were conducted in the anechoic chamber and high speed flow facility at The University of Texas at Austin. Both nozzles exhibit free shock separated flow, restricted shock separated flow and an end-effects-regime prior to flowing full. Radon transforms of the shadowgraphy images are used to identify the locations in the flow where sound waves are being generated. During these off design operations of the nozzles, most sound waves are generated by turbulence interactions with the shock cells located in the supersonic annular plume. During the end-effects-regime, this supersonic annular plume is shown to flap violently, thus providing a first principals understanding of the sources of most intense loads during engine ignition
Murder on the mountain: author talk with Peter J. Wosh
No full textAuthor talk by Peter J. Wosh on May 5th, 2022, on his book, "Murder on the Mountain: crime, passion, and punishment in gilded age New Jersey.
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