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Edoardo Mazza - One of the best experts on this subject based on the ideXlab platform.

  • Dynamic measurement of soft tissue viscoelastic properties with a torsional resonator device.
    Medical Image Analysis, 2005
    Co-Authors: Davide Valtorta, Edoardo Mazza
    Abstract:

    A new method for measuring the mechanical properties of soft biological tissues is presented. Dynamic testing is performed by using a torsional resonator, whose free extremity is in contact with a Material Sample. An analytical model of a semi-infinite, homogenous, isotropic medium is used to model the shear wave propagation in the Material Sample and allows determining the complex shear modulus of the soft tissue. By controlling the vibration amplitude, shear strains of less than 0.2% are induced in the tissue so that the Material response can be assumed to be linear viscoelastic. Experiments are performed at different eigenfrequencies of the torsional oscillator and the complex shear modulus is characterized in the range 1-10 kHz. First in vitro experiments on bovine liver confirmed the sensitivity of the proposed technique. The experiment does not damage the soft tissue and allows a fast and local measurement, these being prerequisites for future applications in-vivo during open surgery.

  • MICCAI (2) - Dynamic Measurements of Soft Tissue Viscoelastic Properties with a Torsional Resonator Device
    Medical Image Computing and Computer-Assisted Intervention – MICCAI 2004, 2004
    Co-Authors: Davide Valtorta, Edoardo Mazza
    Abstract:

    A new method for measuring the mechanical properties of soft biological tissues is presented. Dynamic testing is performed by using a torsional resonator, whose free extremity is in contact with a Material Sample. An analytical model of a semi-infinite, homogenous, isotropic medium is used to model the shear wave propagation in the Material Sample and allows determining the complex shear modulus of the soft tissue. By controlling the vibration amplitude, shear strains of less than 0.2% are induced in the tissue so that the Material response can be assumed to be linear viscoelastic. Experiments are performed at different eigenfrequencies of the torsional oscillator and the complex shear modulus is characterized in the range 1-10 kHz. First in vitro experiments on bovine liver confirmed the sensitivity of the proposed technique. The experiment does not damage the soft tissue and allows a fast and local measurement, these being prerequisites for future applications in-vivo during open surgery.

Davide Valtorta - One of the best experts on this subject based on the ideXlab platform.

  • Dynamic measurement of soft tissue viscoelastic properties with a torsional resonator device.
    Medical Image Analysis, 2005
    Co-Authors: Davide Valtorta, Edoardo Mazza
    Abstract:

    A new method for measuring the mechanical properties of soft biological tissues is presented. Dynamic testing is performed by using a torsional resonator, whose free extremity is in contact with a Material Sample. An analytical model of a semi-infinite, homogenous, isotropic medium is used to model the shear wave propagation in the Material Sample and allows determining the complex shear modulus of the soft tissue. By controlling the vibration amplitude, shear strains of less than 0.2% are induced in the tissue so that the Material response can be assumed to be linear viscoelastic. Experiments are performed at different eigenfrequencies of the torsional oscillator and the complex shear modulus is characterized in the range 1-10 kHz. First in vitro experiments on bovine liver confirmed the sensitivity of the proposed technique. The experiment does not damage the soft tissue and allows a fast and local measurement, these being prerequisites for future applications in-vivo during open surgery.

  • MICCAI (2) - Dynamic Measurements of Soft Tissue Viscoelastic Properties with a Torsional Resonator Device
    Medical Image Computing and Computer-Assisted Intervention – MICCAI 2004, 2004
    Co-Authors: Davide Valtorta, Edoardo Mazza
    Abstract:

    A new method for measuring the mechanical properties of soft biological tissues is presented. Dynamic testing is performed by using a torsional resonator, whose free extremity is in contact with a Material Sample. An analytical model of a semi-infinite, homogenous, isotropic medium is used to model the shear wave propagation in the Material Sample and allows determining the complex shear modulus of the soft tissue. By controlling the vibration amplitude, shear strains of less than 0.2% are induced in the tissue so that the Material response can be assumed to be linear viscoelastic. Experiments are performed at different eigenfrequencies of the torsional oscillator and the complex shear modulus is characterized in the range 1-10 kHz. First in vitro experiments on bovine liver confirmed the sensitivity of the proposed technique. The experiment does not damage the soft tissue and allows a fast and local measurement, these being prerequisites for future applications in-vivo during open surgery.

Michael E. Zolensky - One of the best experts on this subject based on the ideXlab platform.

  • hayabusa returned Sample curation in the planetary Material Sample curation facility of jaxa
    Meteoritics & Planetary Science, 2014
    Co-Authors: Toru Yada, Akio Fujimura, Masanao Abe, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Keisuke Nagao, Yukihiro Ishibashi, Kei Shirai, Michael E. Zolensky
    Abstract:

    –  The Planetary Material Sample Curation Facility of JAXA (PMSCF/JAXA) was established in Sagamihara, Kanagawa, Japan, to curate planetary Material Samples returned from space in conditions of minimum terrestrial contaminants. The performances for the curation of Hayabusa-returned Samples had been checked with a series of comprehensive tests and rehearsals. After the Hayabusa spacecraft had accomplished a round-trip flight to asteroid 25143 Itokawa and returned its reentry capsule to the Earth in June 2010, the reentry capsule was brought back to the PMSCF/JAXA and was put to a series of processes to extract recovered Samples from Itokawa. The particles recovered from the Sample catcher were analyzed by electron microscope, given their ID, grouped into four categories, and preserved in dimples on quartz slide glasses. Some fraction of them has been distributed for initial analyses at NASA, and will be distributed for international announcement of opportunity (AO), but a certain fraction of them will be preserved in vacuum for future analyses.

  • Hayabusa‐returned Sample curation in the Planetary Material Sample Curation Facility of JAXA
    Meteoritics & Planetary Science, 2013
    Co-Authors: Toru Yada, Akio Fujimura, Masanao Abe, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Keisuke Nagao, Yukihiro Ishibashi, Kei Shirai, Michael E. Zolensky
    Abstract:

    –  The Planetary Material Sample Curation Facility of JAXA (PMSCF/JAXA) was established in Sagamihara, Kanagawa, Japan, to curate planetary Material Samples returned from space in conditions of minimum terrestrial contaminants. The performances for the curation of Hayabusa-returned Samples had been checked with a series of comprehensive tests and rehearsals. After the Hayabusa spacecraft had accomplished a round-trip flight to asteroid 25143 Itokawa and returned its reentry capsule to the Earth in June 2010, the reentry capsule was brought back to the PMSCF/JAXA and was put to a series of processes to extract recovered Samples from Itokawa. The particles recovered from the Sample catcher were analyzed by electron microscope, given their ID, grouped into four categories, and preserved in dimples on quartz slide glasses. Some fraction of them has been distributed for initial analyses at NASA, and will be distributed for international announcement of opportunity (AO), but a certain fraction of them will be preserved in vacuum for future analyses.

Toru Yada - One of the best experts on this subject based on the ideXlab platform.

  • hayabusa returned Sample curation in the planetary Material Sample curation facility of jaxa
    Meteoritics & Planetary Science, 2014
    Co-Authors: Toru Yada, Akio Fujimura, Masanao Abe, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Keisuke Nagao, Yukihiro Ishibashi, Kei Shirai, Michael E. Zolensky
    Abstract:

    –  The Planetary Material Sample Curation Facility of JAXA (PMSCF/JAXA) was established in Sagamihara, Kanagawa, Japan, to curate planetary Material Samples returned from space in conditions of minimum terrestrial contaminants. The performances for the curation of Hayabusa-returned Samples had been checked with a series of comprehensive tests and rehearsals. After the Hayabusa spacecraft had accomplished a round-trip flight to asteroid 25143 Itokawa and returned its reentry capsule to the Earth in June 2010, the reentry capsule was brought back to the PMSCF/JAXA and was put to a series of processes to extract recovered Samples from Itokawa. The particles recovered from the Sample catcher were analyzed by electron microscope, given their ID, grouped into four categories, and preserved in dimples on quartz slide glasses. Some fraction of them has been distributed for initial analyses at NASA, and will be distributed for international announcement of opportunity (AO), but a certain fraction of them will be preserved in vacuum for future analyses.

  • Hayabusa‐returned Sample curation in the Planetary Material Sample Curation Facility of JAXA
    Meteoritics & Planetary Science, 2013
    Co-Authors: Toru Yada, Akio Fujimura, Masanao Abe, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Keisuke Nagao, Yukihiro Ishibashi, Kei Shirai, Michael E. Zolensky
    Abstract:

    –  The Planetary Material Sample Curation Facility of JAXA (PMSCF/JAXA) was established in Sagamihara, Kanagawa, Japan, to curate planetary Material Samples returned from space in conditions of minimum terrestrial contaminants. The performances for the curation of Hayabusa-returned Samples had been checked with a series of comprehensive tests and rehearsals. After the Hayabusa spacecraft had accomplished a round-trip flight to asteroid 25143 Itokawa and returned its reentry capsule to the Earth in June 2010, the reentry capsule was brought back to the PMSCF/JAXA and was put to a series of processes to extract recovered Samples from Itokawa. The particles recovered from the Sample catcher were analyzed by electron microscope, given their ID, grouped into four categories, and preserved in dimples on quartz slide glasses. Some fraction of them has been distributed for initial analyses at NASA, and will be distributed for international announcement of opportunity (AO), but a certain fraction of them will be preserved in vacuum for future analyses.

  • Processes to Open the Container and the Sample Catcher of the Hayabusa Returned Capsule in the Planetary Material Sample Curation Facility of JAXA
    2011
    Co-Authors: Akio Fujimura, Toru Yada, Masanao Abe, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Yukihiro Ishibashi, Kei Shirai, Tetsuji Okada, Hajime Yano
    Abstract:

    Japanese spacecraft Hayabusa, which returned from near-Earth-asteroid Itokawa, successfully returned its reentry capsule to the Earth, the Woomera Prohibited Area in Australia in Jun 13th, 2010, as detailed in another paper [1]. The capsule introduced into the Planetary Material Sample Curation Facility in the Sagamihara campus of JAXA in the early morning of June 18th. Hereafter, we describe a series of processes for the returned capsule and the container to recover gas and Materials in there. A transportation box of the recovered capsule was cleaned up on its outer surface beforehand and introduced into the class 10,000 clean room of the facility. Then, the capsule was extracted from the box and its plastic bag was opened and checked and photographed the outer surface of the capsule. The capsule was composed of the container, a backside ablator, a side ablator, an electronic box and a supporting frame. The container consists of an outer lid, an inner lid, a frame for latches, a container and a Sample catcher, which is composed of room A and B and a rotational cylinder. After the first check, the capsule was packed in a plastic bag with N2 again, and transferred to the Chofu campus in JAXA, where the X-ray CT instrument is situated. The first X-ray CT analysis was performed on the whole returned capsule for confirming the conditions of latches and O-ring seal of the container. The analysis showed that the latches of the container should have worked normally, and that the double Orings of the container seemed to be sealed its Sample catcher with no problem. After the first X-ray CT, the capsule was sent back to Sagamihara and introduced in the clean room to exclude the electronic box and the side ablator from the container by hand tools. Then the container with the backside ablator was set firmly to special jigs to fix the lid of container tightly to the container and set to a milling machine. The backside ablator was drilled by the machine to expose heads of bolts, which combined the ablator to the outer lid of the container, and after the drilling had been finished, all the bolts were unscrewed and the backside ablator was removed from the container. Then, the container was sent to the Chofu X-ray facility again to examine in detail by a micro X-ray CT instrument in order to reconfirm that the condition of the latches of the lid of container was normal and that its double O-ring seemed to have been sealed after the last X-ray CT analysis.

Emmanuel Guillot - One of the best experts on this subject based on the ideXlab platform.

  • ECC - Control of a solar furnace using active cooling
    2016 European Control Conference (ECC), 2016
    Co-Authors: Bertinho A. Costa, J M Lemos, Emmanuel Guillot
    Abstract:

    This paper explores a control architecture for a solar furnace that uses active cooling to improve the temperature reference tracking during the decreasing phase of the reference. This is done in conjunction with the command of the shutter that adjusts the incident power and compensates sun power variability due to weather conditions. The controller uses exact linerization coupled with a PI controller to handle model parameter uncertainty. Off-line identification is employed to characterize the temperature dynamics, this is used to avoid online adaptation mechanisms that may cause stability problems during the controller startup, that may melt the Material Sample. Experimental results obtained from the plant in closed loop control using active cooling are presented.

  • control of a solar furnace using mpc with integral action
    IFAC-PapersOnLine, 2016
    Co-Authors: Bertinho A. Costa, J M Lemos, Emmanuel Guillot
    Abstract:

    Abstract Solar furnaces are devices employed in high temperature Material stress tests that use concentrated solar energy. This process has a nonlinear dynamics caused by a fourth power temperature term and by the nonlinear behavior of the shutter. Sun power variability due to weather conditions may affect the operation of a solar furnace if it is not compensated by adjusting the shutter aperture. The contribution of this paper is to explore and to evaluate the application of model predictive control with integral action to a nonlinear process. Off-line identification is employed to characterize the temperature dynamics. This methodology avoids the use of online adaptation mechanisms that may cause stability problems during temperature stress tests that may melt the Material Sample. The aim is to design a controller with a good performance, able to track the temperature cycling profile without overshooting to avoid melting the Material Sample. Active cooling is also explored to improve the temperature tracking during the decrease of the temperature profile. Experimental results obtained from the closed loop control of the plant are presented.