jorge lassig - Academia.edu (original) (raw)

Papers by jorge lassig

Boletín Geográfico, 2006

La distribucion de sustancias disueltas, nutrientes, microorganismos y planctones influenciada po... more La distribucion de sustancias disueltas, nutrientes, microorganismos y planctones influenciada por la circulacion del agua en los lagos, por lo que el adecuadoconocimiento de los movimientos del agua adquiere importancia en la caracterizacion de ecosistemas lacustres ya que ademas, inciden en la distribucion del calor entre las distintas capas del lago. Una de las caracteristicas mas importantes del lago es su estructura termica. El contenido de calor del cuerpo de agua es de vital importancia en los estudios de la calidad de agua en lagos. El metabolismo y el comportamiento de los organismos acuaticos estan directamente relacionados con la temperatura del agua.

土木工程与建筑英文版, 2014

Leeward of natural elevations, like mountains and hills, the air flow becomes turbulent and often... more Leeward of natural elevations, like mountains and hills, the air flow becomes turbulent and often times damaging and hazardous to aviation and downwind populations. There is currently a trend for massive construction projects, the result of which are megastructures that behave similarly to these natural elevations and create analogous turbulence conditions. Examples five mega projects were analyzed, and it was estimated that the Reynolds number variation in these buildings, is from 6.10 8 and 7.10 9 , for winds between 10 m/s and 50 m/s. In this work, the authors present a first numerical approach to this phenomenon by calculating the Strouhal numbers induced by winds blowing against large-volume bodies, in the range of high Reynolds numbers. For this study, satellite images depicting von Kármán cloud streets leeward of isolated islands were used. The methodology employed was based on a satellite image where streets watch von Kármán vortex, from NOAA-ARL (National Oceanic and Atmospheric Administration-Air Resource Laboratory) prognosis was obtained for a grid point near the island, then determined the inversion layer and meteorological data (wind, temperature and pressure), was measured from the satellite image the distances separating the vortices to calculate the period, the Reynolds number and Strouhal. The studied results of the cases are displayed graphically, where it is possible to observe a data dispersion as well as a rising trend of the Strouhal number as the Reynolds number increases.

IOSR Journal of Mechanical and Civil Engineering, 2016

Wind and Structures An International Journal, 2012

ABSTRACT Argentina is a large country with several areas dominated by different climate mechanism... more ABSTRACT Argentina is a large country with several areas dominated by different climate mechanisms. Since 2008, damage to civil structures caused by strong winds has been surveyed in Chaco and the neighbouring areas. Chaco is a province of NEA, the north-east region of the Argentina, which also includes the provinces of Formosa, Corrientes and Misiones. The strong wind events in NEA are related to severe convective storms. In this work, we present findings about wind-induced damage in NEA and the prevailing meteorological conditions. We emphasise seven particular cases for which the conditions of the atmosphere were reconstructed through reanalysis.

Revista Iberoamericana De Ingenieria Mecanica, 2012

Recibido 8 de junio de 2011, para publicación 25 de julio de 2011)

into a GAS Canister ( GAS-761) on board of NASA Space Shuttle. The experiment results, on Endeavo... more into a GAS Canister ( GAS-761) on board of NASA Space Shuttle. The experiment results, on Endeavour shuttle flight STS-108 on December 2001, are analysed. to measure the movement of a paraffin drop inside a tube with water, when temperature gradients exist inside the liquid. The temperature gradients are controlled by an on board computer, specially designed, which controls the

The objective of this work is to produce two maps with the distribution of the average wind speed... more The objective of this work is to produce two maps with the distribution of the average wind speed to 10 and 30 meters above ground level. Was utilized a diagnostic model, that it satisfies the conservation of mass. A mesh is set up throughout the region of interest. It was used remote sensing data to obtain geophysical dates, in each point of the mesh. The atmospheric boundary layer information was obtained of atmospheric models. The calculations of the wind field are carried out with surface data and upper-wind data. In the map of the average velocity of the wind to 10 meters above ground level is observed velocities between 4.0 m/s and 5.0 m/s. The maximums (5.5 to 6.0 m/s) are located where the height exceeds 600 meters above sea level. In the field of the average wind velocity to 30 meters above ground level, the maximums have velocities over 6.5 m/s. Differences of 0.1 m/s (absolute value) are observed between the velocities measures and them calculated by the model. The wind d...

This paper presents a description of the design and ensuing develop-ment of an automated liquid d... more This paper presents a description of the design and ensuing develop-ment of an automated liquid droplet generator and related utilization aboard the space shuttle, a) as a fluid positioning system for materials processing (attached droplet method), and b) as a means to measure surface oscillation of droplets under microgravity for determining their surface tension.

RESUMEN El campo de estudio de los fluidos en micro gravedad es una disciplina científica de reci... more RESUMEN El campo de estudio de los fluidos en micro gravedad es una disciplina científica de reciente creación. Desde 1995 en la Facultad de Ingeniería de la Universidad Nacional del Comahue, se están desarrollando trabajos de investigación y experimentación en micro gravedad en el campo de la Física de los Fluidos. Las áreas abarcan: capilaridad, convección impulsada por fuerzas de tensión superficial, generación de puentes líquidos y dinámica de gotas. Para ello se dispone de un tanque de flotación neutral para simular condiciones de micro gravedad, y una torre de caída libre que permite realizar pruebas en micro gravedad por 1,5 segundos. Infraestructura básica para constituir el Primer Laboratorio sobre Micro Gravedad en Latinoamérica. Se describen los instrumentos que constituyen el Laboratorio de Microgravedad, como los experimentos que en él se realizan. En 1997 hemos ensayado tres equipos científicos, en vuelos parabólicos a bordo del avión KC-135 de la NASA en Ellington Fie...

Thin-Walled Structures, 2014

Oil storage tanks are usually arranged in groups in tank farms, and this configuration may affect... more Oil storage tanks are usually arranged in groups in tank farms, and this configuration may affect their buckling and postbuckling strength under wind loads. The assessment of wind action on tank structures is performed in this work by means of wind tunnel experiments to evaluate the pattern of pressure distribution for a tank which is shielded by another tank under various configurations and separation between them. The experimental results show significant changes in pressures due to shielding effects. In a second stage the structural response under the pressures previously evaluated is performed by finite element analysis using both linear bifurcation and geometrically nonlinear analysis. Results of two-tank interaction are compared with those of an isolated tank. Based on the results, it is concluded that the changes in wind pressures due to group effects induce changes in buckling loads and in the associated deflected patterns.

International Journal of Space Technology Management and Innovation, 2013

37th Aerospace Sciences Meeting and Exhibit, 1999

Wind Engineering, 2000

... Claudia Palese, Jorge L. Lässig, Marisa G. Cogliati and Marcelo A. Bastanski Facultad de Inge... more ... Claudia Palese, Jorge L. Lässig, Marisa G. Cogliati and Marcelo A. Bastanski Facultad de Ingeniería, Universidad Nacional del Comahue, Buenos Aires ... However, till recent times wind energy had been impossible to develop because of two main reasons: first, there existed in A ...

Journal of Wind Engineering and Industrial Aerodynamics, 1999

Extreme wind episodes influence most economic and social regional activities. Wind and dust storm... more Extreme wind episodes influence most economic and social regional activities. Wind and dust storms produce local troubles and discomfort. This paper describes climatological wind characteristics and a surface layer wind profile following a power-law profile approach for later wind tunnel studies. An adequate building plan could improve general life conditions. Statistical results concerning yearly and seasonal mean values were obtained. Two proper series of wind speed measurements were made and analyzed.