| Home | [41–50] << 51 52 53 54 55 56 57 58 59 60 >> [61–70] |
|
| Records | |||||
|---|---|---|---|---|---|
| Author | Fourati, H., Manamanni, N., Afilal, L., Van Hove, P., & Y. Handrich | ||||
| Title | An Efficient Body segment posture Tracking Fusing Magnetic and Inertial Sensing: An Observer-based Approach with Multiplicative Quaternion Correction. The 11th international conference on Sciences and Techniques of Automatic control & computer engineering. December 19-21, 2010, Monastir, Tunisia. | Type | Conference - International - Article with Reading Comitee | ||
| Year | 2010 | Publication | Abbreviated Journal | ||
| Volume | Issue | Pages | |||
| Keywords | |||||
Abstract  |
This paper concerns body attitude (orientation) estimation for free ranging animal. This work is applied in Bio-logging, an interdisciplinary research area at the intersection of animal behavior and bioengineering. The main idea of the proposed approach combines a quaternion-based sliding mode
observer with a Levenberg Marquardt Algorithm (LMA) and exploits measurements from Micro-Electro-Mechanical-System (MEMS) sensors as a 3-axis accelerometer, a 3-axis magnetometer and a 3-axis gyroscope to produce attitude estimates during the entire range of the observed animal’s body movements. By considering the rigid-body dynamics expressed in quaternion representation, a Complementary Sliding Mode Observer (CSMO) is derived taking advantages from strap-down inertial measurement from gyroscope and vector observations from accelerometer and magnetometer to provide accurate attitude estimates. The efficiency of the proposed approach is showed with a set of experiments through sensor measurements provided by an Inertial Measurement Unit (IMU |
||||
| Programme | 394 | ||||
| Campaign | |||||
| Address | |||||
| Corporate Author | Thesis | ||||
| Publisher | Place of Publication | Editor | |||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | ISBN | Medium | |||
| Area | Expedition | Conference | |||
| Notes | Approved | yes | |||
| Call Number | Serial | 515 | |||
| Permanent link to this record | |||||
| Author | Fourati Hassen, Manamanni Noureddine, Afilal Lissan, Handrich Yves, | ||||
| Title | Posture and body acceleration tracking by inertial and magnetic sensing: Application in behavioral analysis of free-ranging animals | Type | Journal Article | ||
| Year | 2011 | Publication | Biomedical Signal Processing and Control | Abbreviated Journal | |
| Volume | 6 | Issue | 1 | Pages | 94 -104 |
| Keywords | Attitude and orientation estimation, Nonlinear observer, Bio-signals analysis and interpretation, Bio-logging, Dynamic Body Acceleration (DBA), Quaternion, | ||||
| Abstract |
This paper concerns body attitude (orientation) estimation for free ranging animal. The main idea of the proposed approach combines a quaternion-based nonlinear observer with an Iterated Least Squares Algorithm (ILSA) and exploits measurements from Micro-Electro-Mechanical-System (MEMS) sensors as 3-axis accelerometer, 3-axis magnetometer and 3-axis gyroscope to produce attitude estimates during the entire range of the observed animal's body movements. Moreover, the proposed observer allows estimating the bias in gyroscope which is used to correct the angular velocity measurements in the attitude estimation step. Since, biologists use an index of DBA for evaluating the energy consumption of the moving animal; the resulting estimations are then used to extract the Dynamic Body Acceleration (DBA) of the animal. Note that, this work is necessary in Bio-logging science and allows monitoring aspects of animal's biology (behavior, movement, and physiology) and environments. The performance of the algorithm is theoretically proven and illustrated by an attitude estimation example. Moreover, the efficiency of the proposed approach is shown with a set of experiments through sensor measurements provided by an Inertial Measurement Unit (IMU). We have also included some comparison results with another method already applied in Bio-logging field in order to point out the improvements issued from the proposed approach.
|
||||
| Programme | 394 | ||||
| Campaign | |||||
| Address | |||||
| Corporate Author | Thesis | ||||
| Publisher | Place of Publication | Editor | |||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 1746-8094 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | yes | |||
| Call Number | Serial | 2681 | |||
| Permanent link to this record | |||||
| Author | Fourati Hassen, Manamanni Noureddine, Afilal Lissan, Handrich Yves, | ||||
| Title | Posture and body acceleration tracking by inertial and magnetic sensing: Application in behavioral analysis of free-ranging animals | Type | Journal Article | ||
| Year | 2011 | Publication | Biomedical Signal Processing and Control | Abbreviated Journal | |
| Volume | 6 | Issue | 1 | Pages | 94-104 |
| Keywords | Attitude and orientation estimation, Nonlinear observer, Bio-signals analysis and interpretation, Bio-logging, Dynamic Body Acceleration (DBA), Quaternion, | ||||
| Abstract |
This paper concerns body attitude (orientation) estimation for free ranging animal. The main idea of the proposed approach combines a quaternion-based nonlinear observer with an Iterated Least Squares Algorithm (ILSA) and exploits measurements from Micro-Electro-Mechanical-System (MEMS) sensors as 3-axis accelerometer, 3-axis magnetometer and 3-axis gyroscope to produce attitude estimates during the entire range of the observed animal's body movements. Moreover, the proposed observer allows estimating the bias in gyroscope which is used to correct the angular velocity measurements in the attitude estimation step. Since, biologists use an index of DBA for evaluating the energy consumption of the moving animal; the resulting estimations are then used to extract the Dynamic Body Acceleration (DBA) of the animal. Note that, this work is necessary in Bio-logging science and allows monitoring aspects of animal's biology (behavior, movement, and physiology) and environments. The performance of the algorithm is theoretically proven and illustrated by an attitude estimation example. Moreover, the efficiency of the proposed approach is shown with a set of experiments through sensor measurements provided by an Inertial Measurement Unit (IMU). We have also included some comparison results with another method already applied in Bio-logging field in order to point out the improvements issued from the proposed approach. | ||||
| Programme | 394 | ||||
| Campaign | |||||
| Address | |||||
| Corporate Author | Thesis | ||||
| Publisher | Place of Publication | Editor | |||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 1746-8094 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | yes | |||
| Call Number | Serial | 3614 | |||
| Permanent link to this record | |||||
| Author | Traversi, R.; Becagli, S.; Castellano, E.; Cerri, O.; Morganti, A.; Severi, M.; Udisti, R. | ||||
| Title | Study of Dome C site (East Antartica) variability by comparing chemical stratigraphies | Type | Journal Article | ||
| Year | 2009 | Publication | Microchemical Journal | Abbreviated Journal | Polar Chemistry |
| Volume | 92 | Issue | 1 | Pages | 7-14 |
| Keywords | Antarctica; Dome C; Snowpit; Chemical analysis; Post-depositional effects | ||||
| Abstract |
This paper compares chemical stratigraphies from snowpits collected at Dome C (East Antarctica) in order to assess site variability in terms of spatial distribution of chemical markers, annual accumulation rate and chemical species persistence in the snow layers. Since Dome C was chosen for deep drilling down to the bedrock in the framework of EPICA (European Project for Ice Coring in Antarctica), to provide 800kyr of climatic and environmental records, evaluating site variability is fundamental for a reliable interpretation of the deep ice core stratigraphies.
For this purpose, 4 snowpits were dug at Dome C (1997/98, 1998/99, 2000/01 and 2005/06 Antarctic Campaigns) and analysed for cations, inorganic anions and methane sulphonate by ion chromatography. Unlike the first three snowpits, the most recent one was analysed directly in situ, allowing to observe that no chemical contamination or loss due to sample storage and transport to Europe occurs for such a sampling. Accumulation rate variability was revealed to be around 4% in a common time range (1992-1964) for all snowpits. Intra-snowpit chemical variability was definitely higher than inter-snowpit variability, indicating that the variations observed in the chemical stratigraphies from Dome C can be reliably related to effective changes in source and transport mechanisms of the investigated markers more than to site variability. Post-depositional phenomena affecting chloride, nitrate and methane sulphonate were studied, revealing a logarithmic decay as a function of depth for Cl- and MSA and an exponential one for NO3-. The relative losses were quantified in the 75-80% range for Cl-, 66-83% for MSA and 89-94% for NO3- and were found to stop around 320, 320 and 60-80cm depth, respectively. |
||||
| Programme | 1181 | ||||
| Campaign | |||||
| Address | |||||
| Corporate Author | Thesis | ||||
| Publisher | Place of Publication | Editor | |||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 0026-265X | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | yes | |||
| Call Number | IPEV @ Thierry.Lemaire @ | Serial | 6054 | ||
| Permanent link to this record | |||||
| Author | Anne Boynard, Daniel Hurtmans, Katerina Garane, Florence Goutail, Juliette Hadji-Lazaro, Maria Elissavet Koukouli, Catherine Wespes, Corinne Vigouroux, Arno Keppens, Jean-Pierre Pommereau, Andrea Pazmino, Dimitris Balis, Diego Loyola, Pieter Valks, Ralf Sussmann, Dan Smale, Pierre-François Coheur, Cathy Clerbaux | ||||
| Title | Validation of the IASI FORLI/EUMETSAT ozone products using satellite (GOME-2), ground-based (Brewer–Dobson, SAOZ, FTIR) and ozonesonde measurements | Type | Journal | ||
| Year | 2018 | Publication | Atmospheric Measurement Techniques | Abbreviated Journal | |
| Volume | 11 | Issue | 9 | Pages | 5125-5152 |
| Keywords | |||||
| Abstract |
This Paper Assesses The Quality Of Iasi (Infrared Atmospheric Sounding Interferometer)/metop-a (Iasi-a) And Iasi/metop-b (Iasi-b) Ozone (O3) Products (Total And Partial O3 Columns) Retrieved With The Fast Optimal Retrievals On Layers For Iasi Ozone (Forli-o3; V20151001) Software For 9 Years (2008–july 2017) Through An Extensive Intercomparison And Validation Exercise Using Independent Observations (Satellite, Ground-based And Ozonesonde). Compared With The Previous Version Of Forli-o3 (V20140922), Several Improvements Have Been Introduced In Forli-o3 V20151001, Including Absorbance Look-up Tables Recalculated To Cover A Larger Spectral Range, With Additional Numerical Corrections. This Leads To A Change Of ∼4% In The Total Ozone Column (Toc) Product, Which Is Mainly Associated With A Decrease In The Retrieved O3 Concentration In The Middle Stratosphere (Above 30hpa/25km). Iasi-a And Iasi-b Tocs Are Consistent, With A Global Mean Difference Of Less Than 0.3% For Both Daytime And Nighttime Measurements; Iasi-a Is Slightly Higher Than Iasi-b. A Global Difference Of Less Than 2.4% Is Found For The Tropospheric (Tropo) O3 Column Product (Iasi-a Is Lower Than Iasi-b), Which Is Partly Due To A Temporary Issue Related To The Iasi-a Viewing Angle In 2015. Our Validation Shows That Iasi-a And Iasi-b Tocs Are Consistent With Gome-2 (Global Ozone Monitoring Experiment-2), Dobson, Brewer, Saoz (Système D'analyse Par Observation Zénithale) And Ftir (Fourier Transform Infrared) Tocs, With Global Mean Differences In The Range Of 0.1%–2% Depending On The Instruments Compared. The Worst Agreement With Uv–vis Retrieved Toc (Satellite And Ground) Is Found At The Southern High Latitudes. The Iasi-a And Ground-based Toc Comparison For The Period From 2008 To July 2017 Shows The Long-term Stability Of Iasi-a, With Insignificant Or Small Negative Drifts Of 1%–3%decade−1. The Comparison Results Of Iasi-a And Iasi-b Against Smoothed Ftir And Ozonesonde Partial O3 Columns Vary With Altitude And Latitude, With The Maximum Standard Deviation Being Seen For The 300–150hpa Column (20%–40%) Due To Strong Ozone Variability And Large Total Retrievals Errors. Compared With Ozonesonde Data, The Iasi-a And Iasi-b O3 Tropo Column (Defined As The Column Between The Surface And 300hpa) Is Positively Biased In The High Latitudes (4%–5%) And Negatively Biased In The Midlatitudes And Tropics (11%–13% And 16%–19%, Respectively). The Iasi-a-to-ozonesonde Tropo Comparison For The Period From 2008 To 2016 Shows A Significant Negative Drift In The Northern Hemisphere Of -8.6±3.4%decade−1, Which Is Also Found In The Iasi-a-to-ftir Tropo Comparison. When Considering The Period From 2011 To 2016, The Drift Value For The Tropo Column Decreases And Becomes Statistically Insignificant. The Observed Negative Drifts Of The Iasi-a Tropo O3 Product (8%–16%decade−1) Over The 2008–2017 Period Might Be Taken Into Consideration When Deriving Trends From This Product And This Time Period. | ||||
| Programme | 209 | ||||
| Campaign | |||||
| Address | |||||
| Corporate Author | Thesis | Bachelor's thesis | |||
| Publisher | Place of Publication | Editor | |||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 1867-1381 | ISBN | 1867-1381 | Medium | |
| Area | Expedition | Conference | |||
| Notes | Approved | yes | |||
| Call Number | Serial | 7389 | |||
| Permanent link to this record | |||||
| Author | G. Hubert, S. Aubry | ||||
| Title | Analysis of Solar and Galactic Cosmic Rays Induced Atmospheric Ionizing Radiation: Impacts for Typical Transatlantic Flights and Antarctica Environment | Type | Journal | ||
| Year | 2017 | Publication | Jsm environmental science & ecology | Abbreviated Journal | |
| Volume | 5 | Issue | 3 | Pages | |
| Keywords | |||||
| Abstract |
This paper analyses atmospheric ionizing radiations induced by Galactic and Solar Cosmic Rays (GCR and SCR, respectively) thanks to continuous measurements of neutron spectrum operated in high-altitude stations. Analyses are reinforced using GCR and SCR models, and extensive air shower descriptions based on nuclear transport simulations. First analyses were focused on neutron fluxes as function of altitude. Secondly, atmospheric ionizing radiation impacts on biological doses during quiet period and extreme solar events are presented. On the basis of the relevant comparisons conducted for ambient dose equivalent during quiet solar activity, but also for the comic ray variations calculated and recorded on neutron monitor (NM) during Ground Level Enhancement (GLE) event. GLE 5 model was applied to London ↔ New-york flight dose calculations. All of these results show that dose values vary drastically, on the one hand with the route path (latitude, longitude altitude), on the other hand with the phasing of the solar event. Specific case of Antarctica is discussed because it combines both the high altitude and the very low magnetic field. Analyses show that ionizing radiation in Antarctica environment can be a problematic from the point of view of the human dose, which exerts classical recommendations established for public. This highlights the importance of monitoring atmospheric ionizing radiation, more particularly extreme solar events, then to develop semi-empirical and particle transport method for reliable calculation of dose levels. |
||||
| Programme | 1112 | ||||
| Campaign | |||||
| Address | |||||
| Corporate Author | Thesis | ||||
| Publisher | Place of Publication | Editor | |||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 2333-7141 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | yes | |||
| Call Number | Serial | 7433 | |||
| Permanent link to this record | |||||
| Author | Fourati Hassen, Manamanni Noureddine, Afilal Lissan, Handrich Yves, | ||||
| Title | A Nonlinear Filtering Approach for the Attitude and Dynamic Body Acceleration Estimation Based on Inertial and Magnetic Sensors: Bio-Logging Application | Type | Journal Article | ||
| Year | 2011 | Publication | IEEE Sensors Journal | Abbreviated Journal | |
| Volume | 11 | Issue | 1 | Pages | 233 -244 |
| Keywords | |||||
| Abstract |
This paper addresses the problem of rigid body orientation and Dynamic Body Acceleration (DBA) estimation. This work is applied in bio-logging, an interdisciplinary research area at the intersection of animal behavior and bioengineering. The proposed approach combines a quaternion-based nonlinear filter with the Levenberg Marquardt Algorithm (LMA). The algorithm has a complementary structure design that exploits measurements from a three-axis accelerometer, a three-axis magnetometer, and a three-axis gyroscope. Attitude information is necessary to calculate the animal's DBA in order to evaluate its energy expenditure. Some numerical simulations illustrate the nonlinear filter performance. Some quantitative assessments prove this efficiency such as the time constant of the filter ( ) and the rms magnitude of the quaternion error ( ). Moreover, the effectiveness of the algorithm is experimentally demonstrated. In the experiments a domestic animal is equipped with an Inertial Measurement Unit (MTi-G), which provides a truth attitude for comparison with the complementary nonlinear filter. The rms difference between the filter and MTi-G outputs in the free movement experiments is within 0.392 rms on roll, 0.577 rms on pitch, and 2.521 rms on yaw.
|
||||
| Programme | 394 | ||||
| Campaign | |||||
| Address | |||||
| Corporate Author | Thesis | ||||
| Publisher | Place of Publication | Editor | |||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 1530-437X | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | yes | |||
| Call Number | Serial | 2685 | |||
| Permanent link to this record | |||||
| Author | Cosme, E.; Genthon, C.; Martinerie, P.; Boucher, O.; Pham, M. | ||||
| Title | The sulfur cycle at high-southern latitudes in the LMD-ZT General Circulation Model | Type | Journal Article | ||
| Year | 2002 | Publication | Journal of geophysical research-atmospheres | Abbreviated Journal | J. Geophys. Res. |
| Volume | 107 | Issue | Pages | ||
| Keywords | 0305 Atmospheric Composition and Structure: Aerosols and particles; 0312 Atmospheric Composition and Structure: Air/sea constituent fluxes; 0368 Atmospheric Composition and Structure: Troposphere—constituent transport and chemistry; 3319 Meteorology and Atmospheric Dynamics: General circulation; 9310 Information Related to Geographic Region: Antarctica | ||||
| Abstract |
This modeling study was motivated by the recent publication of year-round records of dimethylsulfide (DMS) and dimethylsulfoxide (DMSO) in Antarctica, completing the available series of sulfate and methanesulfonic acid (MSA). Sulfur chemistry has been incorporated in the Laboratoire de Météorologie Dynamique-Zoom Tracers (LMD-ZT) Atmospheric General Circulation Model (AGCM), with high-resolution and improved physics at high-southern latitudes. The model predicts the concentration of six major sulfur species through emissions, transport, wet and dry deposition, and chemistry in both gas and aqueous phases. Model results are broadly realistic when compared with measurements in air and snow or ice, as well as to results of other modeling studies, at high- and middle-southern latitudes. Atmospheric MSA concentrations are underestimated and DMSO concentrations are overestimated in summer, reflecting the lack of a DMSO heterogeneous sink leading to MSA. Experiments with various recently published estimates of the rate of this sink are reported. Although not corrected in this work, other defects are identified and discussed: DMS concentrations are underestimated in winter, MSA and non-sea-salt (nss) sulfate concentrations may be underestimated at the South Pole, the deposition scheme used in the model may not be adapted to polar regions, and the model does not adequately reproduces interannual variability. Oceanic DMS sources have a major contribution to the variability of sulfur in these regions. The model results suggest that in a large part of central Antarctica ground-level atmospheric DMS concentrations are larger in winter than in summer. At high-southern latitudes, high loads of DMS and DMSO are found and the main chemical sink of sulfur dioxide (SO2) is aqueous oxidation by ozone (O3), whereas oxidation by hydrogen peroxide (H2O2) dominates at the global scale. A comprehensive modeled sulfur budget of Antarctica is provided. | ||||
| Programme | 414;903 | ||||
| Campaign | |||||
| Address | |||||
| Corporate Author | Thesis | ||||
| Publisher | American Geophysical Union | Place of Publication | Editor | ||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 0148-0227 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | yes | |||
| Call Number | IPEV @ Thierry.Lemaire @ | Serial | 5543 | ||
| Permanent link to this record | |||||
| Author | Charly Massa, Bianca B. Perren, Émilie Gauthier, Vincent Bichet, Christophe Petit, Hervé Richard | ||||
| Title | A multiproxy evaluation of Holocene environmental change from Lake Igaliku, South Greenland | Type | Journal | ||
| Year | 2012 | Publication | Journal of Paleolimnology | Abbreviated Journal | |
| Volume | 48 | Issue | 1 | Pages | 241-258 |
| Keywords | |||||
| Abstract |
This is the first integrated multiproxy study to investigate climate, catchment evolution and lake ecology in South Greenland. A 4-m-long sedimentary sequence from Lake Igaliku (61º 00′ N, 45º 26′ W, 15 m asl) documents major environmental and climatic changes in south Greenland during the last 10 ka. The chronology is based on a 210Pb and 137Cs profile and 28 radiocarbon dates. The paleoenvironmental history is interpreted on the basis of magnetic susceptibility, grain size, total organic carbon, total nitrogen and sulphur, sedimentation rates, pollen, and diatom assemblages. The basal radiocarbon date at ca. 10 cal ka BP provides a minimum age for the deglaciation of the basin, which is followed by ~500 years of high sedimentation rates in a glacio-marine environment. After the glacio-isostatic emergence of the basin ca. 9.5 cal ka BP, limnological and terrestrial proxies suggests early warmth, which may have been interrupted by a cold, dry and windy period between 8.6 and 8.1 cal ka BP. A dry and windy event ~5.3–4.8 cal ka BP preceded the Neoglacial transition at Lake Igaliku, which is characterized by a shift toward moister and perhaps cooler conditions ~4.8 cal ka BP, causing major changes in terrestrial and aquatic ecological conditions. Significant cooling is documented after ~3 cal ka BP. Since ~1 cal ka BP the climatic-driven changes were overprinted by the human influence of Norse and recent agriculture. | ||||
| Programme | 1004 | ||||
| Campaign | |||||
| Address | |||||
| Corporate Author | Thesis | ||||
| Publisher | Place of Publication | Editor | |||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | 1573-0417 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | yes | |||
| Call Number | Serial | 8136 | |||
| Permanent link to this record | |||||
| Author | Cyrus Zalian (PhD Student) and Merieme Chadid (PhD Supervisor) | ||||
| Title | Antarctic long-time observations using the PAIX project. | Type | Thesis | ||
| Year | 2016 | Publication | Abbreviated Journal | ||
| Volume | Issue | Pages | |||
| Keywords | |||||
| Abstract |
This is an ongoing PhD work 2013-2016 focused on PAIX project and Polar Antarctic Observations of the pulsating stars. | ||||
| Programme | 1096 | ||||
| Campaign | |||||
| Address | |||||
| Corporate Author | Thesis | ||||
| Publisher | Place of Publication | Editor | |||
| Language | Summary Language | Original Title | |||
| Series Editor | Series Title | Abbreviated Series Title | |||
| Series Volume | Series Issue | Edition | |||
| ISSN | ISBN | Medium | |||
| Area | Expedition | Conference | |||
| Notes | Approved | yes | |||
| Call Number | Serial | 6254 | |||
| Permanent link to this record | |||||