Santiago Correa V. | Universidad EAFIT (original) (raw)

Papers by Santiago Correa V.

Research paper thumbnail of LIRIS (Long-slit Intermediate Resolution Infrared Spectrograph) Project status

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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Research paper thumbnail of LIRIS (Long-slit Intermediate Resolution Infrared Spectrograph)

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Research paper thumbnail of Constituents of roots of Inga edulis var. parviflora

Fitoterapia, 1995

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Research paper thumbnail of Elemento acústico de tres nodos para interacción fluido estructura basado en un principio variacional parametrizado

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 fluid–structure 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 fluid–structure interface.

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Research paper thumbnail of Resistencia de dientes restaurados con postes prefabricados ante cargas de máxima intercuspidación, masticación y bruxismo

Revista cubana de estomatología

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Research paper thumbnail of Large Lenses and Prisms

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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Research paper thumbnail of Differences in the microstructure and fatigue properties of dentine between residents of North and South America

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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Research paper thumbnail of Acoustic displacement triangle based on the individual element test

Latin American Journal of Solids and Structures, 2012

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Research paper thumbnail of Evaluation of the structural behavior of three and four implant-supported fixed prosthetic restorations by finite element analysis

Journal of Prosthodontic Research, 2012

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Research paper thumbnail of <title>Mechanics of LIRIS (long-slit intermediate-resolution infrared spectrograph) at first commissioning</title>

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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Research paper thumbnail of <title>Design of a Slit Mechanism for OSIRIS</title>

Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, 2003

ABSTRACT

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Research paper thumbnail of <title>Status of the EMIR mechanical system</title>

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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Research paper thumbnail of <title>Test results: EMIR optomechanics</title>

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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Research paper thumbnail of <title>The EDGE Project</title>

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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Research paper thumbnail of <title>LIRIS (Long-slit Intermediate Resolution Infrared Spectrograph): Assembly Integration and verification</title>

Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, 2003

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Research paper thumbnail of <title>OSIRIS tunable imager and spectrograph for the GTC. Instrument status</title>

Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, 2003

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Research paper thumbnail of <title>The EMIR optical system</title>

Large Lenses and Prisms, 2002

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Research paper thumbnail of <title>Structural and thermal analysis of EMIR</title>

Ground-based Instrumentation for Astronomy, 2004

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Research paper thumbnail of <title>EMIR mechanical design status</title>

Ground-based Instrumentation for Astronomy, 2004

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Research paper thumbnail of <title>EMIR: the GTC NIR multi-object imager-spectrograph</title>

Ground-based Instrumentation for Astronomy, 2004

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Research paper thumbnail of LIRIS (Long-slit Intermediate Resolution Infrared Spectrograph) Project status

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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Research paper thumbnail of LIRIS (Long-slit Intermediate Resolution Infrared Spectrograph)

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Research paper thumbnail of Constituents of roots of Inga edulis var. parviflora

Fitoterapia, 1995

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Research paper thumbnail of Elemento acústico de tres nodos para interacción fluido estructura basado en un principio variacional parametrizado

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 fluid–structure 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 fluid–structure interface.

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Research paper thumbnail of Resistencia de dientes restaurados con postes prefabricados ante cargas de máxima intercuspidación, masticación y bruxismo

Revista cubana de estomatología

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Research paper thumbnail of Large Lenses and Prisms

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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Research paper thumbnail of Differences in the microstructure and fatigue properties of dentine between residents of North and South America

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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Research paper thumbnail of Acoustic displacement triangle based on the individual element test

Latin American Journal of Solids and Structures, 2012

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Research paper thumbnail of Evaluation of the structural behavior of three and four implant-supported fixed prosthetic restorations by finite element analysis

Journal of Prosthodontic Research, 2012

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Research paper thumbnail of <title>Mechanics of LIRIS (long-slit intermediate-resolution infrared spectrograph) at first commissioning</title>

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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Research paper thumbnail of <title>Design of a Slit Mechanism for OSIRIS</title>

Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, 2003

ABSTRACT

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Research paper thumbnail of <title>Status of the EMIR mechanical system</title>

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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Research paper thumbnail of <title>Test results: EMIR optomechanics</title>

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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Research paper thumbnail of <title>The EDGE Project</title>

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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Research paper thumbnail of <title>LIRIS (Long-slit Intermediate Resolution Infrared Spectrograph): Assembly Integration and verification</title>

Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, 2003

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Research paper thumbnail of <title>OSIRIS tunable imager and spectrograph for the GTC. Instrument status</title>

Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, 2003

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Research paper thumbnail of <title>The EMIR optical system</title>

Large Lenses and Prisms, 2002

Bookmarks Related papers MentionsView impact

Research paper thumbnail of <title>Structural and thermal analysis of EMIR</title>

Ground-based Instrumentation for Astronomy, 2004

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Research paper thumbnail of <title>EMIR mechanical design status</title>

Ground-based Instrumentation for Astronomy, 2004

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Research paper thumbnail of <title>EMIR: the GTC NIR multi-object imager-spectrograph</title>

Ground-based Instrumentation for Astronomy, 2004

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