Un enfoque gerencial de factores críticos para el éxito de los sistemas de información: Caso de estudio en PYMEs metalmecánicas venezolanas

Informes oficiales de países en desarrollo señalan, en general, significativas deficiencias en el tratamiento de la información en las pequeñas y medianas empresas (Pyme). Contar con sistemas de información automatizados (SI) es ineludible, pero es más importante que sean exitosos, para lo cual la satisfacción del usuario final es el factor clave que llevará a obtener los beneficios esperados. Los niveles gerenciales y los profesionales de informática deben estar familiarizados con los principales factores relacionados para asegurar su adecuado tratamiento. Este estudio evaluó la satisfacción del usuario final y varios factores críticos de éxito relacionados en una muestra de empresas industriales medianas (Pymi). Para ello, se utilizó uno de los modelos de éxito más reconocidos por la comunidad investigadora del área. Realizados los análisis cuantitativo/cualitativo y comparados los resultados se concluye que el principal factor relacionado con la satisfacción del usuario final es la calidad de la información, lo cual puede ser suficiente para considerar como exitoso un SI; con esto los demás factores quedan en segundo lugar. El beneficio práctico de esta investigación es reflexionar sobre estos factores, contribuir a reforzar la efectividad y calidad de los procesos de desarrollo o adquisición de un SI y reducir su índice de fracasos.

Future reference evapotranspiration in Duero Valley (Spain)

The impact of climate change and its relation with evapotranspiration was evaluated in the Duero River Basin (Spain). The study shows the possible future situations 50 years from now from the reference evapotranspiration (ETo). The maximum temperature (Tmax), minimum temperature (Tmin), dew point (Td), wind speed (U) and net radiation (Rn) trends during the 1980-2009 period were obtained and extrapolated with the FAO-56 Penman- Montheith equation to estimate ETo. Changes in stomatal resistance in response to increases in CO2 were also considered. Four scenarios were done, considering the concentration of CO2 and the period analyzed (annual or monthly). The scenarios studied showed the changes in ETo as a consequence of the annual and monthly trends in the variables Tmax, Tmin, Td, U and Rn with current and future CO2 concentrations (372 ppm and 550 ppm). The future ETo showed increases between 118 mm (11%) and 55 mm (5%) with respect to the current situation of the river basin at 1042 mm. The months most affected by climate change are May, June, July, August and September, which also coincide with the maximum water needs of the basin?s crops

Trends in climatic variables and future reference evapotranspiration in Duero Valley (Spain)

The impact of climate change and its relation with evapotranspiration was evaluated in the Duero River Basin (Spain). The study shows possible future situations 50 yr from now from the reference evapotranspiration (ETo). The maximum temperature (Tmax), minimum temperature (Tmin), dew point (Td), wind speed (U) and net radiation (Rn) trends during the 1980–2009 period were obtained and extrapolated with the FAO-56 Penman-Montheith equation to estimate ETo. Changes in stomatal resistance in response to increases in CO2 were also considered. Four scenarios were done, taking the concentration of CO2 and the period analyzed (annual or monthly) into consideration. The scenarios studied showed the changes in ETo as a consequence of the annual and monthly trends in the variables Tmax, Tmin, Td, U and Rn with current and future CO2 concentrations (372 ppm and 550 ppm). The future ETo showed increases between 118 mm (11 %) and 55 mm (5 %) with respect to the current situation of the river basin at 1042 mm. The months most affected by climate change are May, June, July, August and September, which also coincide with the maximum water needs of the basin’s crops

Floating liquid zones

The aim of our experiment on the Spacelab Dl Mission was to study the stability of long liquid columns under microgravity. Nominal configuration was a cylindrical liquid bridge anchored at the edges of two equal solid discs, 35 mm in diameter. Mechanical stimuli were applied through the discs and the liquid outer shape recorded for analysis. Nominal experiment procedures [1] were similar to those proposed for Spacelab-1 (1983), where by wetting problems allowed only partial success [2]. The same Fluid Physics Module, but with corrected end discs and a manually operated syringe for liquid injection, was used.

Biblia latina : cum postillis Nicolai de Lyra et expositionibus Guillelmi Britonis in prologos S. Hieronymi et additionibus Pauli Burgensis replicisque Mathiae Doering.

Tít. tomado del IBE