Valeria Varas - Academia.edu (original) (raw)
Papers by Valeria Varas
Biochemical and Biophysical Research Communications, 2004
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In this work, we introduce the MIDAS-CASE subsystem for Web services. MIDAS-CASE is a MDA tool fo... more In this work, we introduce the MIDAS-CASE subsystem for Web services. MIDAS-CASE is a MDA tool for Web information systems development. Using an extension of UML language for representing the Web services Description Language standard, the MIDAS-CASE subsystem proposed supports the modeling of Web services in extended UML and the automatic generation of the respective WSDL description for the Web service modeled.
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Biochemical and Biophysical Research Communications, 2002
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Journal of Computer Applications in Technology, 2010
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Communications of The ACM
Some thoughts about author order in research papers.
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Information & Software Technology, 2011
ContextModel-driven approaches deal with the provision of models, transformations between them an... more ContextModel-driven approaches deal with the provision of models, transformations between them and code generators to address software development. This approach has the advantage of defining a conceptual structure, where the models used by business managers and analysts can be mapped into more detailed models used by software developers. This alignment between high-level business specifications and the lower-level information technologies (ITs)
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Progress in Oceanography, 2007
In the highly productive region off central Chile, the structure and temporal and spatial variabi... more In the highly productive region off central Chile, the structure and temporal and spatial variability of planktonic assemblages, and the factors that determine changes in this structure are poorly understood. In the region, wind-driven upwelling, heating by solar radiation and freshwater inputs are highly seasonal processes, which, together with higher frequency events, can promote changes in the planktonic communities, especially in the upper layer. This study focuses on the structure of nano- through to micro-planktonic assemblages (2 200 μm) of unicellular organisms (protists) in surface waters (0 30 m) during different hydrographic conditions. Samples were taken from a fixed shelf station off Concepción (COPAS time series Station 18) on eight occasions between September 2003 and August 2004. The nano-plankton flagellate-dominated fraction was numerically important during the whole period. Maxima in flagellate abundance and biomass occurred during the upwelling period (November April samplings) but these maxima appear to be unrelated to the degree of water column stratification. The micro-plankton diatom-dominated fraction was usually the largest component in terms of biomass during the study period and the diatoms made important numerical contributions during the upwelling period, with maxima in abundance and biomass when water column stability was lowest. The dominant genera and morphotypes in each functional group were found throughout the study period, with maxima in abundance and biomass co-occurring under similar environmental upwelling conditions. The mean macro-nutrient concentrations (nitrate and silicate) were relatively high in the top 30 m during both upwelling and non-upwelling periods, and did not explain the maxima in plankton or functional group replacements. The persistence of the dominant taxa in the planktonic assemblages suggests a high degree of flexibility, though probably not at the specific level, to withstand the highly variable environmental conditions in this upwelling area.
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Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Biochemical and Biophysical Research Communications, 2004
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In this work, we introduce the MIDAS-CASE subsystem for Web services. MIDAS-CASE is a MDA tool fo... more In this work, we introduce the MIDAS-CASE subsystem for Web services. MIDAS-CASE is a MDA tool for Web information systems development. Using an extension of UML language for representing the Web services Description Language standard, the MIDAS-CASE subsystem proposed supports the modeling of Web services in extended UML and the automatic generation of the respective WSDL description for the Web service modeled.
Bookmarks Related papers MentionsView impact
Biochemical and Biophysical Research Communications, 2002
Bookmarks Related papers MentionsView impact
Journal of Computer Applications in Technology, 2010
Bookmarks Related papers MentionsView impact
Communications of The ACM
Some thoughts about author order in research papers.
Bookmarks Related papers MentionsView impact
Information & Software Technology, 2011
ContextModel-driven approaches deal with the provision of models, transformations between them an... more ContextModel-driven approaches deal with the provision of models, transformations between them and code generators to address software development. This approach has the advantage of defining a conceptual structure, where the models used by business managers and analysts can be mapped into more detailed models used by software developers. This alignment between high-level business specifications and the lower-level information technologies (ITs)
Bookmarks Related papers MentionsView impact
Progress in Oceanography, 2007
In the highly productive region off central Chile, the structure and temporal and spatial variabi... more In the highly productive region off central Chile, the structure and temporal and spatial variability of planktonic assemblages, and the factors that determine changes in this structure are poorly understood. In the region, wind-driven upwelling, heating by solar radiation and freshwater inputs are highly seasonal processes, which, together with higher frequency events, can promote changes in the planktonic communities, especially in the upper layer. This study focuses on the structure of nano- through to micro-planktonic assemblages (2 200 μm) of unicellular organisms (protists) in surface waters (0 30 m) during different hydrographic conditions. Samples were taken from a fixed shelf station off Concepción (COPAS time series Station 18) on eight occasions between September 2003 and August 2004. The nano-plankton flagellate-dominated fraction was numerically important during the whole period. Maxima in flagellate abundance and biomass occurred during the upwelling period (November April samplings) but these maxima appear to be unrelated to the degree of water column stratification. The micro-plankton diatom-dominated fraction was usually the largest component in terms of biomass during the study period and the diatoms made important numerical contributions during the upwelling period, with maxima in abundance and biomass when water column stability was lowest. The dominant genera and morphotypes in each functional group were found throughout the study period, with maxima in abundance and biomass co-occurring under similar environmental upwelling conditions. The mean macro-nutrient concentrations (nitrate and silicate) were relatively high in the top 30 m during both upwelling and non-upwelling periods, and did not explain the maxima in plankton or functional group replacements. The persistence of the dominant taxa in the planktonic assemblages suggests a high degree of flexibility, though probably not at the specific level, to withstand the highly variable environmental conditions in this upwelling area.
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
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