6,589 research outputs found
CASTRO, J.E. and Nicolás SOTELO
No full textLetter from J.E. Castro and Nicolás Sotelo to Gen. Alvaro Obregón asking for a money loan. Response lamenting not being able to attend to their request. / Carta de los Srs. J.E. Castro y Nicolás Sotelo al Gral. Alvaro Obregón pidiéndole dinero prestado. Respuesta lamentando no poder atenderlos
Interactions between airflow and valley topography with implications for aeolian sediment transport
No full textThe local topography of a landscape can have a profound influence on airflow characteristics and cause modifications to broader synoptic scale winds. This paper reports the results of a preliminary field study examining the effects of a valley on wind velocity and direction. Anemometers and wind vanes were used to measure airflow characteristics upwind, within and downwind of a 20 m deep and 175 m wide dry valley in the central Namib desert. The field data indicate an upwind region of flow acceleration, a minimum in flow velocity in the center of the valley, flow acceleration toward a maximum at the downwind valley edge and subsequent deceleration toward starting velocities downwind of this edge. The development of a flow separation region at the leading edge of the valley and the range of flow distortion are affected by the incident angle of the approaching wind to the axis of the valley. A conceptual model indicating the potential implications of these findings for aeolian sediment transport processes in the vicinity of dryland valleys is presented
Crítica de Libros.
No full textUn estudio sobre la depresión. C. Castilla del Pino. Editorial Nexos 1991. Emilia García Castro Psicoanálisis. Reflexiones epistemológicas. R. Cruz Rache. Instituto de España Espasa Calpe. 1991. Emilia García Castro Diagnóstico en psiquiatría. J. Guimón, J.E. Mezzich y G.E. Berrios. Editorial Salvat 1989. Emilia García Castro La enfermedad grave: aspectos médicos y psicosociales. A. Kaufmann, P. Ajach AND R. Waisman. Editorial lnteramericana-McGraw-Hill. Madrid 1990. Rustica, 223 pags. Formato libro de bolsillo. J.L. Pedreira Massa El niño hiperactivo. E.A. Taylor. Editorial Martinez Roca. Barcelona, 1991. Rústica, 230 páginas. Formato holandesa. J.L. Pedreira Massa La construcción del éxito y del fracaso escolar. Ph. Perrenoud. Editorial Paideia-Morata. Madrid, 1990. Rústica, 284 págs. Formato manual. J. L. Pedreira Massa. The imterpersonal world of the infant. Le monde interpersonnel du nurrisson. D.N. Stern. Editoriales: Basic Books, Inc., Publishers. New York, 1985. Puf París, 1990. Rústica, 381 págs. Formato libro de bolsillo. J. L. Pedreira Mass
Crítica de Libros.
No full textUn estudio sobre la depresión. C. Castilla del Pino. Editorial Nexos 1991. Emilia García Castro Psicoanálisis. Reflexiones epistemológicas. R. Cruz Rache. Instituto de España Espasa Calpe. 1991. Emilia García Castro Diagnóstico en psiquiatría. J. Guimón, J.E. Mezzich y G.E. Berrios. Editorial Salvat 1989. Emilia García Castro La enfermedad grave: aspectos médicos y psicosociales. A. Kaufmann, P. Ajach AND R. Waisman. Editorial lnteramericana-McGraw-Hill. Madrid 1990. Rustica, 223 pags. Formato libro de bolsillo. J.L. Pedreira Massa El niño hiperactivo. E.A. Taylor. Editorial Martinez Roca. Barcelona, 1991. Rústica, 230 páginas. Formato holandesa. J.L. Pedreira Massa La construcción del éxito y del fracaso escolar. Ph. Perrenoud. Editorial Paideia-Morata. Madrid, 1990. Rústica, 284 págs. Formato manual. J. L. Pedreira Massa. The imterpersonal world of the infant. Le monde interpersonnel du nurrisson. D.N. Stern. Editoriales: Basic Books, Inc., Publishers. New York, 1985. Puf París, 1990. Rústica, 381 págs. Formato libro de bolsillo. J. L. Pedreira Mass
Resistencia de tres poblaciones de Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) a los insecticidas Tebufenocide y Metoxyfenocide
No full textUniversidad Nacional Agraria La Molina. Facultad de Agronomía. Departamento Académico de EntomologíaSe evaluó la resistencia de Spodoptera frugiperda (J.E. Smith) a los insecticidas Tebufenocide y Metoxifenocide, mediante la realización de bioensayos toxicológicos bajo condiciones de laboratorio. Se evaluaron tres poblaciones procedentes de campos de espárrago de los valles de Virú, Ica y Rimac, esta última procedente de campos orgánicos, siendo así, considerada como la raza susceptible de referencia. El tratamiento consistió en la inmersión de hojas de Ricinus communis en las soluciones de insecticidas, para luego ser acondicionadas en placas Petri junto a larvas de tercer estadío. Se utilizaron 7 concentraciones logarítmicas para cada insecticida. La CL50 estimada para el Tebufenocide fue de 0,51; 0,29; 0,19 (mL P.C. / Lagua) para las poblaciones del valle de Virú, Ica y Lima, respectivamente; mientras que para Metoxifenocide la CL50 estimada fue 0,09; 0,26; 0,18 (mL P.C. / Lagua) para las mismas poblaciones, respectivamente. Los resultados demuestran la ocurrencia de leve resistencia al Tebufenocide en las poblaciones de los valles de Virú e Ica, con razones de resistencia de 2,7 y 1,5, respectivamente. Por otro lado, la población de Ica fue 1,4 veces más resistente al Metoxyfenocide respecto a la población susceptible de referencia. Se recomienda la implementación de un programa de manejo de la resistencia para retardar la evolución de este fenómeno.The resistance of Spodoptera frugiperda (J.E. Smith) to Tebufenozide and Metoxyfenocide insecticides was evaluated by performing toxicological bioassays under laboratory conditions. Three populations Valley Trujillo, Ica and La Molina were evaluated. The latter comes from organic fields, thus being considered as the susceptible reference strain. The execution method consisted of immersing leaves of Ricinus communis in each insecticidal solution and then conditioning them in petri dishes with third instar larvae. Seven logarithmic concentrations were used for each insecticide. The LC50 for Tebufenocide was 0,51; 0,29; 0,19 (mL C.P. / Lagua) for Viru, Ica and Rimac, respectively, while Metoxyfenozide LC50 found were 0,09; 0,26; 0,18 (mL C.P. / Lagua) over the same populations respectively. The results demonstrate the occurrence of a slight resistance to Tebufenocide in populations of Viru and Ica, with resistance factors of 2,7 and 1,5; respectively. On the other hand, the population of Ica was 1,4 times more resistant to metoxyfenocide than the susceptible reference population. The implementation of a programme of resistance management is recommended in order to delay the evolution of this phenomenon.Tesi
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Preliminary Geologic Map of the North Half of the Union Pass Quadrangle, Mohave County, Arizona
No full textPreliminary Geologic Map of the North Half of the Union Pass Quadrangle, Mohave County, Arizona. Includes one map sheet with cross section at 1:24,000 map scale.On 1/17/2014, F.L. Hillemeyer's name was removed from the author list per his request. (The request was forwarded to AZGS by J.E. Faulds.)Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact [email protected]
Building and Defining Behavioral Economics
No full textContains fulltext :
95156.pdf (Publisher’s version ) (Closed access)George Loewenstein, a prominent behavioral economist, recalls thatIn 1994, when Thaler, Camerer, Rabin, Prelec and I spent the year at the Center for Advanced Study in the Behavioral Sciences, we had a meeting to make a kind of final decision about what to call what we were doing. Remarkably, at that time, the name behavioral economics was not yet well established. I actually advocated “psychological economics,” and Thaler was strong on behavioral economics. I'm kind of glad that he prevailed; I think it's a better, catchier, label, although it creates confusion due to association with Behaviorism. (G. Loewenstein, personal email to author, June 16, 2008
The IPHAS catalogue of H alpha emission-line sources in the northern Galactic plane
No full textWe present a catalogue of point-source H alpha emission-line objects selected from the INT/WFC Photometric Ha Survey (IPHAS) of the northern Galactic plane. The catalogue covers the magnitude range 13 <= r' <= 19.5 and includes Northern hemisphere sources in the Galactic latitude range -5 degrees < b < 5 degrees. It is derived from similar to 1500 deg(2) worth of imaging data, which represents 80 per cent of the final IPHAS survey area. The electronic version of the catalogue will be updated once the full survey data become available. In total, the present catalogue contains 4853 point sources that exhibit strong photometric evidence for Ha emission. We have so far analysed spectra for similar to 300 of these sources, confirming more than 95 per cent of them as genuine emission-line stars. A wide range of stellar populations are represented in the catalogue, including early-type emission-line stars, active late-type stars, interacting binaries, young stellar objects and compact nebulae.
The spatial distribution of catalogue objects shows overdensities near sites of recent or current star formation, as well as possible evidence for the warp of the Galactic plane. Photometrically, the incidence of Ha emission is bimodally distributed in (r' - i'). The blue peak is made up mostly of early-type emission-line stars, whereas the red peak may signal an increasing contribution from other objects, such as young/active low-mass stars. We have cross-matched our H alpha-excess catalogue against the emission-line star catalogue of Kohoutek & Wehmeyer, as well as against sources in SIMBAD. We find that fewer than 10 per cent of our sources can be matched to known objects of any type. Thus IPHAS is uncovering an order of magnitude more faint (r' > 13) emission-line objects than were previously known in the Milky Way
LES and RANS for turbulent flow over arrays of wall-mounted obstacles
No full textLarge-eddy simulation (LES) has been applied to calculate the turbulent flow over staggered wall-mounted cubes and staggered random arrays of obstacles with area density 25%, at Reynolds numbers between 5 × 10^3 and 5 10^6, based on the free stream velocity and the obstacle height. Re = 5 × 10^3 data were intensively validated against direct numerical simulation (DNS) results at the same Re and experimental data obtained in a boundary layer developing over an identical roughness and at a rather higher Re. The results collectively confirm that Reynolds number dependency is very weak, principally because the surface drag is predominantly form drag and the turbulence production process is at scales comparable to the roughness element sizes. LES is thus able to simulate turbulent flow over the urban-like obstacles at high Re with grids that would be far too coarse for adequate computation of corresponding smooth-wall flows. Comparison between LES and steady Reynolds-averaged Navier-Stokes (RANS) results are included, emphasising that the latter are inadequate, especially within the canopy region
Testing protoplanetary disc dispersal with radio emission
No full textWe consider continuum free–free radio emission from the upper atmosphere of protoplanetary discs as a probe of the ionized luminosity impinging upon the disc. Making use of previously computed hydrodynamic models of disc photoevaporation within the framework of extreme-ultraviolet (EUV) and X-ray irradiation, we use radiative transfer post-processing techniques to predict the expected free–free emission from protoplanetary discs. In general, the free–free luminosity scales roughly linearly with ionizing luminosity in both EUV- and X-ray-driven scenarios, where the emission dominates over the dust tail of the disc and is partial optically thin at cm wavelengths. We perform a test observation of GM Aur at 14–18?GHz and detect an excess of radio emission above the dust tail to a very high level of confidence. The observed flux density and spectral index are consistent with free–free emission from the ionized disc in either the EUV- or the X-ray-driven scenario. Finally, we suggest a possible route to testing the EUV- and X-ray-driven dispersal model of protoplanetary discs, by combining observed free–free flux densities with measurements of mass-accretion rates. On the point of disc dispersal one would expect to find an M?2? scaling with free–free flux in the case of EUV-driven disc dispersal or an ?* scaling in the case of X-ray-driven disc dispersa
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