J. Gavira

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Papers by J. Gavira

The expert qualification and acceptance campaign: A multi-purpose experience for future re-entry missions

ABSTRACT

EXPERT - Demonstrating Reentry Aerothermodinamics Phenomena from a System Perspective

ABSTRACT

EXPERT: The ESA experimental re-Entry test-bed: System overview

16th AIAA/DLR/DGLR International Space Planes and Hypersonic Systems and Technologies Conference, 2009

EXPERT is developed by the European Space Agency (ESA) in order to provide the scientific communi... more EXPERT is developed by the European Space Agency (ESA) in order to provide the scientific community with quality data on critical aero-thermodynamic phenomena encountered during hypersonic flights as well as to provide industry with system experience of re-entry vehicle manufacturing and development of hypersonic instrumentation. EXPERT is equipped with 14 experiments provided by several scientific institutions all around Europe. The experiments address the following phenomena: TPS material characterization, surface catalysis and oxidation, plasma spectroscopy, laminar to turbulent transition, flow separation and reattachment, shock-boundary layer interactions, base flow characteristic and aerodynamic characterization of flap control surfaces. The paper focus on the status of the EXPERT project: the design activities and the on going manufacturing, the main challenges and the expected flight data results. EXPERT will benefit future atmospheric re-entry activities ranging from cargo to human orbital transportation systems as well as re-usable launchers and scientific probes.

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EXPERT: The ESA experimental re-entry test-bed programme

esamultimedia.esa.int, 2008

EXPERT is developed by the European Space Agency in order to provide high quality data on the cri... more

Scan mechanism for master limb sounding instrument

ABSTRACT

Wire boom mechanism for BepiColombo mission to Mercury

The BepiColombo Cornerstone to Mercury is the next milestone of the Horizon 2000+ scientific prog... more The BepiColombo Cornerstone to Mercury is the next milestone of the Horizon 2000+ scientific program plan of the European Space Agency devoted to the study of the planets of the Solar System. The BepiColombo mission scenario imposes severe thermal and radiation environments on the spacecraft exposed surfaces and scientific instrument mechanisms due to the position of Mercury in the Solar System. Amongst the instrumentation required for supporting scientific research, long dipole antennae are used to measure the electric component of wave fields. Mechanisms used to feature these wire boom antennae must be designed to the most stringent requirements derived from the hostile environment. A design of such a wire boom mechanism is here presented along with the most outstanding findings of the test campaign to which the engineering model was submitted.

The expert qualification and acceptance campaign: A multi-purpose experience for future re-entry missions

by F. Massobrio and J. Gavira

ABSTRACT

EXPERT - Demonstrating Reentry Aerothermodinamics Phenomena from a System Perspective

by F. Massobrio and J. Gavira

ABSTRACT

<title>APEX-airborne prism experiment: the realization phase of an airborne hyperspectral imager</title>

Sensors, Systems, and Next-Generation Satellites VIII, 2004

APEX (Airborne Prism EXperiment) is a project of the European Space Agency ESA focusing on high a... more APEX (Airborne Prism EXperiment) is a project of the European Space Agency ESA focusing on high accuracy simulation, calibration and validation for spaceborne remote sensing instruments. The instrumentation comprises a hyperspectral imager for various standard airborne platforms, a fixed installed calibration home base and a complete facility for data processing and archiving. The pushbroom-type instrument accommodates two spectrometer channels covering a spectral range from 0.38 up to 2.5 micron. The spatial/spectral resolution amounts to 1000 samples at 28degree field of view with 312 spectral bands. The overall instrument design and its built-in characterization unit will allow excellent performance stability under various flight conditions. The presentation will focus on the design, development and realization phases of the instrument and discuss various highlights of technical achievements, as there are the infrared HgCdTe detector with extended array format for the short wave infrared channel, the thermal/mechanical stabilization of the spectrometer and the realization of the infrastructure for high accuracy characterization and calibration of the instrument. *)

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In-Flight Testing of Critical Technologies and Experimentation of Aerothermodynamic Phenomena

16th AIAA/DLR/DGLR International Space Planes and Hypersonic Systems and Technologies Conference, 2009

... Systems, Arcachon, France, 2003. [4] F. Massobrio, R. Viotto, M. Serpico, A. Sansone, M. Capo... more

Status of the airborne dispersive pushbroom imaging spectrometer APEX (Airborne Prism Experiment)

IGARSS 2003. 2003 IEEE International Geoscience and Remote Sensing Symposium. Proceedings (IEEE Cat. No.03CH37477), 2003

Over the past few years, a joint Swiss/Belgian initiative resulted in a project to build a new ge... more Over the past few years, a joint Swiss/Belgian initiative resulted in a project to build a new generation airborne imaging spectrometer, namely APEX (Airborne Prism Experiment) under the ESA funding scheme named PRODEX. APEX is designed to be a dispersive pushbroom imaging spectrometer operating in the solar reflected wavelength range between 400 and 2500 nm. The spectral resolution is designed to be better than 10 nm in the SWIR and 5 nm in VIS/NIR range of the spectrum. The total FOV is on the order of ± 14deg, recording 1000 pixels across track, and max. 300 spectral bands simultaneously. The final radiance data products are well characterized and calibrated to be traceable to absolute standards. APEX is subdivided into an industrial team responsible for the optical instrument, the calibration home base, and the detectors, and a science and operational team, responsible for the processing and archiving of the imaging spectrometer data, as well as its operation. APEX is in its design phase with partial breadboarding activities and will be operationally available to the user community in the year 2005.

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APEX: Current status of the airborne dispersive pushbroom imaging spectrometer

Recently, a joint Swiss/Belgian initiative started a project to build a new generation airborne i... more Recently, a joint Swiss/Belgian initiative started a project to build a new generation airborne imaging spectrometer, namely APEX (Airborne Prism Experiment) under the ESA funding scheme named PRODEX. APEX is a dispersive pushbroom imaging spectrometer operating in the spectral range between 380 -2500 nm. The spectral resolution will be better then 10 nm in the SWIR and < 5 nm in the VNIR range of the solar reflected range of the spectrum. The total FOV will be ± 14 deg, recording 1000 pixels across track with max. 300 spectral bands simultaneously. APEX is subdivided into an industrial team responsible for the optical instrument, the calibration homebase, and the detectors, and a science and operational team, responsible for the processing and archiving of the imaging spectrometer data, as well as for its operation. APEX is in its design phase and the instrument will be operationally available to the user community in the year 2006.

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The airborne imaging spectrometer apex: from concept to realization

APEX (Airborne Prism EXperiment) is a project of the European Space Agency ESA focusing on high a... more APEX (Airborne Prism EXperiment) is a project of the European Space Agency ESA focusing on high accuracy simulation, calibration and validation for spaceborne remote sensing instruments. The instrumentation comprises a hyperspectral imager for various standard airborne platforms, a fixed installed calibration home base and a complete facility for data processing and archiving. The pushbroom-type instrument accommodates two spectrometer channels covering a spectral range from 0.38 up to 2.5 micron. The spatial/spectral resolution amounts to 1000 samples at 28-degree field of view with 312 spectral bands. The overall instrument design and its built-in characterization unit will allow excellent performance stability under various flight conditions. The paper outlines ongoing activities on the design, development and realization of the imaging spectrometer, the processing and archiving facility, calibration home base and the set-up of the APEX Science and Operations Center.

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TMM &M tether deployment mechanism features and test results

Long-life, elevated-velocity slip-ring contacts investigation

by A. Gisiger and J. Gavira

The MIDAS experiment for the Rosetta mission

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MIDAS -- An Instrument for In-Situ High-Resolution Imaging of Cometary Dust Particles

The flight model of the MIDAS instrument has been delivered and integrated on the Rosetta spacecr... more

Cardiac effects of chronic CT-1 overloading in vivo

Hypertension

Atomic force microscopy for cometary dust

The instrument MIDAS (Micro-Imaging Dust Analysis System) is part of the Rosetta Orbiter payload ... more The instrument MIDAS (Micro-Imaging Dust Analysis System) is part of the Rosetta Orbiter payload and will provide three dimensional images and statistical parameters of dust particles captured from the coma of comet 46P/Wirtanen at a resolution down to a few nanometres. These images will help to understand the formation processes of cometary material and the role of the organic and

Combined catheter ablation and left atrial appendage closure as a hybrid procedure for the treatment of atrial fibrillation

Europace, 2015

Left atrial appendage (LAA) is the source of thrombi in up to 90% of patients with non-valvular a... more Left atrial appendage (LAA) is the source of thrombi in up to 90% of patients with non-valvular atrial fibrillation (AF). Catheter ablation (CA) is an effective treatment for symptomatic AF and, in selected cases, LAA occlusion devices have been introduced as an alternative to oral anticoagulants (OACs). The safety and feasibility of combining CA and percutaneous LAA closure (LAAC) are unknown. Patients with symptomatic drug-refractory AF, CHADS2 score of ≥1, and CHA2DS2-VASc score ≥2 were included. Catheter ablation consisted in pulmonary vein isolation with or without roof line with radiofrequency and LAA was occluded with the Watchman or Amplatzer Cardiac Plug (ACP) devices guided by angiography and transoesophageal echocardiography. A total of 35 patients were included (71% male; 70 years). Median score was 3 on both CHA2DS2-VASc and HAS-BLED, 9% had prior stroke under OAC, and 48% had bleeding complications. Successful CA and device implantation were achieved in 97% of cases. The Watchman device was used in 29 patients and ACP in 6 patients. Periprocedural complications included three cases of cardiac tamponade. At 3 months, all patients met the criteria for successful sealing of the LAA. After a mean follow-up of 13 months (3-75), 78% of patients were free of arrhythmia recurrences and OAC was withheld in 97% of patients. The combination of CA and percutaneous LAAC in a single procedure is technically feasible in patients with symptomatic drug-refractory AF, high risk of stroke, and contraindications to OACs, although it is associated with a significant risk of major complications.

J. Gavira

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