Santiago Correa V. | Universidad EAFIT (original) (raw)
Papers by Santiago Correa V.
LIRIS is an Instituto de Astrofísica de Canarias project that consists of a near-infrared interme... more LIRIS is an Instituto de Astrofísica de Canarias project that consists of a near-infrared intermediate- resolution spectrograph, conceived as a common user instrument for the William Herschel Telescope at the Observatorio del Roque de los Muchachos (La Palma).
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Fitoterapia, 1995
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This article presents a finite element formulation based on a parameterized variational principle... more This article presents a finite element formulation based on a parameterized variational principle for solving plane problems of fluidstructure interaction using the displacements as state variable for both solid and fluid media. The circular spurious modes, typical of displacement formulations are avoided. The penalty parameter is not random because it is selected according to energy criterion. Finally the formulation is not sensible to the definition of the normal direction in the fluidstructure interface.
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Revista cubana de estomatología
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EMIR is a multiobject intermediate resolution near infrared (1.0 - 2.5 microns) spectrograph with... more EMIR is a multiobject intermediate resolution near infrared (1.0 - 2.5 microns) spectrograph with image capabilities to be mounted on the Gran Telescopio Canarias (Observatorio del Roque de los Muchachos, La Palma, Spain). EMIR is under design by a consortium of Spanish, French and British institutions, led by the Instituto de Astrofisica de Canarias. This work has been partially funded by the GTC Project Office. The instrument will deliver images and spectra in a large FOV (6 X 6 arcmin), and because of the telescope image scale (1 arcmin equals 52 mm) and the spectral resolution required, around 4000, one of the major challenges of the instrument is the optics and optomechanics. Different approaches have been studied since the initial proposal, trying to control the risks of the instrument, while fitting the initial scientific requirements. Issues on optical concepts, material availability, temperature as well as optomechanical mounting of the instrument will be presented.© (2002)...
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Archives of Oral Biology, 2014
Spatial variations in the microstructure of dentine contribute to its mechanical behaviour. The o... more Spatial variations in the microstructure of dentine contribute to its mechanical behaviour. The objective of this investigation was to compare the microstructure and fatigue behaviour of dentine from donors of two different countries. Caries-free third molars were obtained from dental practices in Colombia, South America and the US to assemble two age-matched samples. The microstructure of the coronal dentine was evaluated at three characteristic depths (i.e. deep, middle and superficial dentine) using scanning electron microscopy and image processing techniques. The mechanical behaviour of dentine in these three regions was evaluated by the fatigue crack growth resistance. Cyclic crack growth was achieved in-plane with the dentine tubules and the fatigue crack growth behaviour was characterized in terms of the stress intensity threshold and the Paris Law parameters. There was no difference in the tubule density between the dentine of patients from the two countries. However, there were significant differences (p≤0.05) in the tubule lumen diameters between the two groups in the deep and peripheral regions. In regards to the fatigue resistance, there was a significant increase (p≤0.05) in threshold stress intensity range, and a significant decrease in fatigue crack growth coefficient with increasing distance from the pulp in teeth from the US donors. In contrast, these properties were independent of location for the dentine of teeth from the Colombian donors. The microstructure of dentine and its mechanical behaviour appear to be a function of patient background, which may include environmental factors and/or ethnicity.
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Latin American Journal of Solids and Structures, 2012
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Journal of Prosthodontic Research, 2012
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Ground-based Instrumentation for Astronomy, 2004
LIRIS is a near-infrared intermediate resolution spectrograph with added capabilities for multi-s... more LIRIS is a near-infrared intermediate resolution spectrograph with added capabilities for multi-slit, imaging, coronography, and polarimetry, developed by the Instituto de Astrofisica de Canarias (IAC). It will be a common user instrument for the Cassegrain focus of the William Herschel Telescope (WHT) at the Roque de los Muchachos Observatory in La Palma. At its first commissioning, that was held in
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Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, 2003
ABSTRACT
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Ground-based and Airborne Instrumentation for Astronomy, 2006
EMIR is the NIR multi-object imager and spectrograph for the GTC (Gran Telescopio Canarias). The ... more EMIR is the NIR multi-object imager and spectrograph for the GTC (Gran Telescopio Canarias). The instrument ADR (Advanced Design Review) was held successfully in March 2006. During the AD phase, a number of mechanical concepts were tested on development prototypes to ensure the feasibility of the PDR proposed designs. This presentation contains an overview of the current mechanical status of
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Optomechanics 2005, 2005
EMIR is a NIR multiobject spectrograph with imaging capabilities to be used at the GTC. The first... more EMIR is a NIR multiobject spectrograph with imaging capabilities to be used at the GTC. The first collimator lens in EMIR, made of Fused Silica, has an outer diameter of 490 mm, and a weight of 265 N, which make it one of the largest Fused Silica lenses ever mounted to work under cryogenic conditions. The results of the various tests being done at the IAC (with two different lens dummies) in order to validate a mounting design concept for this lens, are presented here. The radial support concept tested consists of three contact areas around the lens, one of which is a PTFE block, preloaded by coil springs and the other two are fixed supports made of Aluminum and PTFE, dimensioned in order to keep lens centered both at room temperature and under operation conditions.
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Airborne Telescope Systems II, 2003
ABSTRACT VERA (VLBI Exploration of Radio Astrometry), being promoted by National Astronomical Obs... more ABSTRACT VERA (VLBI Exploration of Radio Astrometry), being promoted by National Astronomical Observatory of Japan in collaboration with several Japanese universities, is a new VLBI array for phase referencing astrometry approved to start its construction in 2000. VERA, the first VLBI array dedicated to phase referencing VLBI, has a dual beam antenna system which enables us to observe a Galactic maser source and a nearby reference source simultaneously to remove the atmospheric fluctuation, and will measure positions of Galactic maser sources relative to reference sources (QSOs and radio galaxies) with 10 microarcsec level accuracy. With that accuracy, VERA will be able to determine parallaxes and proper motions of maser sources in the whole Galaxy. The major science targets of VERA will include 3D structure of the Galaxy and the distribution of dark matter, physics of outflow in star forming regions and stellar envelopes, precise calibration of the period-luminosity relation of Mira-type stars, and structure an evolution of QSOs and radio galaxies.© (2000) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, 2003
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Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, 2003
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Large Lenses and Prisms, 2002
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Ground-based Instrumentation for Astronomy, 2004
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Ground-based Instrumentation for Astronomy, 2004
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Ground-based Instrumentation for Astronomy, 2004
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LIRIS is an Instituto de Astrofísica de Canarias project that consists of a near-infrared interme... more LIRIS is an Instituto de Astrofísica de Canarias project that consists of a near-infrared intermediate- resolution spectrograph, conceived as a common user instrument for the William Herschel Telescope at the Observatorio del Roque de los Muchachos (La Palma).
Bookmarks Related papers MentionsView impact
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Fitoterapia, 1995
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This article presents a finite element formulation based on a parameterized variational principle... more This article presents a finite element formulation based on a parameterized variational principle for solving plane problems of fluidstructure interaction using the displacements as state variable for both solid and fluid media. The circular spurious modes, typical of displacement formulations are avoided. The penalty parameter is not random because it is selected according to energy criterion. Finally the formulation is not sensible to the definition of the normal direction in the fluidstructure interface.
Bookmarks Related papers MentionsView impact
Revista cubana de estomatología
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EMIR is a multiobject intermediate resolution near infrared (1.0 - 2.5 microns) spectrograph with... more EMIR is a multiobject intermediate resolution near infrared (1.0 - 2.5 microns) spectrograph with image capabilities to be mounted on the Gran Telescopio Canarias (Observatorio del Roque de los Muchachos, La Palma, Spain). EMIR is under design by a consortium of Spanish, French and British institutions, led by the Instituto de Astrofisica de Canarias. This work has been partially funded by the GTC Project Office. The instrument will deliver images and spectra in a large FOV (6 X 6 arcmin), and because of the telescope image scale (1 arcmin equals 52 mm) and the spectral resolution required, around 4000, one of the major challenges of the instrument is the optics and optomechanics. Different approaches have been studied since the initial proposal, trying to control the risks of the instrument, while fitting the initial scientific requirements. Issues on optical concepts, material availability, temperature as well as optomechanical mounting of the instrument will be presented.© (2002)...
Bookmarks Related papers MentionsView impact
Archives of Oral Biology, 2014
Spatial variations in the microstructure of dentine contribute to its mechanical behaviour. The o... more Spatial variations in the microstructure of dentine contribute to its mechanical behaviour. The objective of this investigation was to compare the microstructure and fatigue behaviour of dentine from donors of two different countries. Caries-free third molars were obtained from dental practices in Colombia, South America and the US to assemble two age-matched samples. The microstructure of the coronal dentine was evaluated at three characteristic depths (i.e. deep, middle and superficial dentine) using scanning electron microscopy and image processing techniques. The mechanical behaviour of dentine in these three regions was evaluated by the fatigue crack growth resistance. Cyclic crack growth was achieved in-plane with the dentine tubules and the fatigue crack growth behaviour was characterized in terms of the stress intensity threshold and the Paris Law parameters. There was no difference in the tubule density between the dentine of patients from the two countries. However, there were significant differences (p≤0.05) in the tubule lumen diameters between the two groups in the deep and peripheral regions. In regards to the fatigue resistance, there was a significant increase (p≤0.05) in threshold stress intensity range, and a significant decrease in fatigue crack growth coefficient with increasing distance from the pulp in teeth from the US donors. In contrast, these properties were independent of location for the dentine of teeth from the Colombian donors. The microstructure of dentine and its mechanical behaviour appear to be a function of patient background, which may include environmental factors and/or ethnicity.
Bookmarks Related papers MentionsView impact
Latin American Journal of Solids and Structures, 2012
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Journal of Prosthodontic Research, 2012
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Ground-based Instrumentation for Astronomy, 2004
LIRIS is a near-infrared intermediate resolution spectrograph with added capabilities for multi-s... more LIRIS is a near-infrared intermediate resolution spectrograph with added capabilities for multi-slit, imaging, coronography, and polarimetry, developed by the Instituto de Astrofisica de Canarias (IAC). It will be a common user instrument for the Cassegrain focus of the William Herschel Telescope (WHT) at the Roque de los Muchachos Observatory in La Palma. At its first commissioning, that was held in
Bookmarks Related papers MentionsView impact
Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, 2003
ABSTRACT
Bookmarks Related papers MentionsView impact
Ground-based and Airborne Instrumentation for Astronomy, 2006
EMIR is the NIR multi-object imager and spectrograph for the GTC (Gran Telescopio Canarias). The ... more EMIR is the NIR multi-object imager and spectrograph for the GTC (Gran Telescopio Canarias). The instrument ADR (Advanced Design Review) was held successfully in March 2006. During the AD phase, a number of mechanical concepts were tested on development prototypes to ensure the feasibility of the PDR proposed designs. This presentation contains an overview of the current mechanical status of
Bookmarks Related papers MentionsView impact
Optomechanics 2005, 2005
EMIR is a NIR multiobject spectrograph with imaging capabilities to be used at the GTC. The first... more EMIR is a NIR multiobject spectrograph with imaging capabilities to be used at the GTC. The first collimator lens in EMIR, made of Fused Silica, has an outer diameter of 490 mm, and a weight of 265 N, which make it one of the largest Fused Silica lenses ever mounted to work under cryogenic conditions. The results of the various tests being done at the IAC (with two different lens dummies) in order to validate a mounting design concept for this lens, are presented here. The radial support concept tested consists of three contact areas around the lens, one of which is a PTFE block, preloaded by coil springs and the other two are fixed supports made of Aluminum and PTFE, dimensioned in order to keep lens centered both at room temperature and under operation conditions.
Bookmarks Related papers MentionsView impact
Airborne Telescope Systems II, 2003
ABSTRACT VERA (VLBI Exploration of Radio Astrometry), being promoted by National Astronomical Obs... more ABSTRACT VERA (VLBI Exploration of Radio Astrometry), being promoted by National Astronomical Observatory of Japan in collaboration with several Japanese universities, is a new VLBI array for phase referencing astrometry approved to start its construction in 2000. VERA, the first VLBI array dedicated to phase referencing VLBI, has a dual beam antenna system which enables us to observe a Galactic maser source and a nearby reference source simultaneously to remove the atmospheric fluctuation, and will measure positions of Galactic maser sources relative to reference sources (QSOs and radio galaxies) with 10 microarcsec level accuracy. With that accuracy, VERA will be able to determine parallaxes and proper motions of maser sources in the whole Galaxy. The major science targets of VERA will include 3D structure of the Galaxy and the distribution of dark matter, physics of outflow in star forming regions and stellar envelopes, precise calibration of the period-luminosity relation of Mira-type stars, and structure an evolution of QSOs and radio galaxies.© (2000) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Bookmarks Related papers MentionsView impact
Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, 2003
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Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, 2003
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Large Lenses and Prisms, 2002
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Ground-based Instrumentation for Astronomy, 2004
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Ground-based Instrumentation for Astronomy, 2004
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Ground-based Instrumentation for Astronomy, 2004
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