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Lesur V, Chambodut A and Maury V (2019),
"The BCMT products and data repository",
In EPOS TCS Geomagnetic Observations. Institute of Geophysics of the CAS, Prague, Czech Republic, June (18-19), 2019.

[Abstract] [BibTeX]

Abstract: The French ``Bureau Central de Magnetisme Terrestre'' (BCMT) operates currently
arround 16 magnetic observatories distributed all over the world and maintains a
database of more than a hundred year of magnetic data, including additional former
observatories in France (2) and in foreign countries (3). Most of them are or had been
operated in collaboration with other institutions.
With the aim of providing a simple, lasting and reliable way to refer to observatories
definitive data, it has been proposed to the partner institutions to attribute a single
Digital Object Identifier (DOI) for the complete dataset of BCMT definitive magnetic
observatory data. We are working on to define a DOI for variometer data.
The landing page for the BCMT dataset is hosted by the IPGP data centre and
includes, through an XML file, a description of the dataset covered by this DOI, the
list of partner institutions that agreed to be included in the DOI and other meta-data
information. A licence has been set for the full data set. Direct links to the data for
each observatory hosted on BCMT ftp server are also provided to facilitate data
access.

BibTeX:

@inproceedings{Lesur-2019-EPOS-TCS,
  author = {Lesur, Vincent and Chambodut, Aude and Maury, Virginie},
  title = {The BCMT products and data repository},
  booktitle = {EPOS TCS Geomagnetic Observations},
  year = {2019},
  note = {poster}
}

Lesur V, Chambodut A and Maury V (2018),
"Digital Object Identifier (DOI) for the BCMT definitive data set",
In IAGA Workshop 2018. Conrad Observatory, Austria, June (24-29), 2018.

[Abstract] [BibTeX]

Abstract: The French ``Bureau Central de Magnetisme Terrestre'' (BCMT) operates currently 16 magnetic observatories distributed all over the world and maintains a database of more than a hundred year of magnetic data, including additional former observatories in France (2) and in foreign countries (3). Most of them are or had been operated in collaboration with other institutions. With the aim of providing a simple, lasting and reliable way to refer to observatories definitive data, it has been proposed to the partner institutions to attribute a single Digital Object Identifier (DOI) for the complete dataset of BCMT definitive magnetic observatory data. The DOI has been available for nearly a year (since October 2017). The landing page for the BCMT dataset is hosted by the IPGP data centre and includes, through an XML file, a description of the dataset covered by this DOI, the list of partner institutions that agreed to be included in the DOI and other meta-data information. A licence has been set for the full data set. Direct links to the data for each observatory hosted on BCMT ftp server are also provided to facilitate data access.

BibTeX:

@inproceedings{Lesur-2018-IAGA-INTERMAGNET,
  author = {Lesur, Vincent and Chambodut, Aude and Maury, Virginie},
  title = {Digital Object Identifier (DOI) for the BCMT definitive data set},
  booktitle = {IAGA Workshop 2018},
  year = {2018},
  note = {poster}
}

Ouldali M, Maury V, Nicolas G and Lepault J (2018),
"Photosome membranes merge and organize tending towards rhombohedral symmetry when light is emitted(",
Journal of Structural Biology., April, 2018. Vol. Volume 202, pp. Pages 35-41.

[Abstract] [BibTeX] [DOI]

Abstract: Polynoid worm elytra emit light when mechanically or electrically stimulated. Specialized cells, the photocytes, contain light emitting machineries, the photosomes. Successive stimulations induce light intensity variations and show a coupling within and between photosomes. Here, we describe, using electron tomography of cryo-substituted elytra and freeze-fracturing, the structural transition associated to light emission: undulating tubules come closer, organize and their number forming photosomes increases. Two repeating undulating tubules in opposite phase compose the photosome. Undulations are located on three hexagonal layers that regularly repeat and are equally displaced, in x y and z. The tubule membranes within layers merge giving rise to rings that tend to obey to quasi-rhombohedral symmetry. Merging may result either from close-association, hemifusion (one leaflet fusion) or from fusion (two leaflets fusion). Although the resolution of tomograms is not sufficient to distinguish these three cases, freeze-fracturing shows that hemifusion is a frequent process that leads to an reversible anastomosed membrane complex favoring communications, appearing as a major coupling factor of photosome light emission.

BibTeX:

@article{Ouldali:2018,
  author = {Ouldali, M. and Maury, V. and Nicolas, G. and Lepault, J.},
  title = {Photosome membranes merge and organize tending towards rhombohedral symmetry when light is emitted(},
  journal = {Journal of Structural Biology},
  year = {2018},
  volume = {Volume 202},
  pages = {Pages 35-41},
  doi = {10.1016/j.jsb.2017.12.001}
}

Maury V, Coïsson P, Lesur V and Chambodut A (2017),
"Doi for BCMT magnetic observatories dataset",
In Joint IAPSO-IAMAS-IAGA Assembly. Cape Town, South Africa, 27 August - 1 September, 2017. (1300)

[Abstract] [BibTeX]

Abstract: The French Bureau Central du Magnetisme Terrestre (BCMT) operates currently 16 magnetic observatories distributed all over the world and maintains a database of more than a hundred year of magnetic data, including additional former observatories in France (2) and in foreign countries (3). Most of them are or had been operated in collaboration with other institutions. With the aim of providing a simple, persistant and reliable way to refer to observatories definitive data, it has been proposed to the partner institutes to attribute a single doi for the complete dataset of BCMT definitive magnetic observatory data. The doi for this dataset is going to be available by July 2017. The landing page for the BCMT dataset is going to be hosted on the IPGP data center and includes a description of the dataset covered by this doi and all observatories which partner institutions agreed to this doi. Direct links to the data of each observatory hosted on BCMT ftp server are also provided to facilitate data access.

BibTeX:

@inproceedings{Maury-2017-IAGA,
  author = {Maury, V. and Coïsson, P. and Lesur, V. and Chambodut, A.},
  title = {Doi for BCMT magnetic observatories dataset},
  booktitle = {Joint IAPSO-IAMAS-IAGA Assembly},
  year = {2017},
  number = {1300}
}

Coïsson P, Heumez B, Telali K, Lalanne X, Luc T, Maury V and Chambodut A (2014),
"Detection of space weather events in magnetic data",
In 11th European Space Weather Week. Liege, Belgium, November (17-21), 2014.

[Abstract] [BibTeX]

Abstract: The magnetic signature of space weather events allows to follow the evolution of magnetic storms from their commencement to the end of the recovery phase. The French Bureau Central du Magnetisme Terrestre manages 16 magnetic observatories distributed all over the world and collects data from for most of them in real time.
Detection of sudden storm commencement is operational and is disseminated to subscribers through e-mail. This service will be developed further to provide additional information about the main characteristics of the undergoing storm.
Another focus of research is the equatorial region. IPGP maintains a chain of magnetometers in West Africa, WAMNET, and a second one will be available by the end of 2014 in East Africa, with a station in Djibouti, coupled with the Addis Ababa observatory. A couple of magnetometers, one located below and one outside the equatorial electrojet can infer the ionospheric ExB drift, responsible of the development of the equatorial anomaly.
We present the result obtained from these chains of magnetometers and the related space weather products.

BibTeX:

@inproceedings{Coisson-2014-ESWW,
  author = {Coïsson, P. and B. Heumez and K. Telali and X. Lalanne and T. Luc and V. Maury and A. Chambodut},
  title = {Detection of space weather events in magnetic data},
  booktitle = {11th European Space Weather Week},
  year = {2014}
}

Libersou S, Albertini A, Ouldali M, Maury V, Maheu C, Raux H, De Haas F, Roche S, Gaudin Y and Lepault J (2010),
"Distinct structural rearrangements of the VSV glycoprotein drive membrane fusion",
Journal of Cell Biology., October, 2010. Vol. 191, pp. 199-210.

[Abstract] [BibTeX] [DOI]

Abstract: The entry of enveloped viruses into cells requires the fusion of viral and cellular membranes, driven by conformational changes in viral glycoproteins. Many studies have shown that fusion involves the cooperative action of a large number of these glycoproteins, but the underlying mechanisms are unknown. We used electron microscopy and tomography to study the low pH-induced fusion reaction catalyzed by vesicular stomatitis virus glycoprotein (G). Pre- and post-fusion crystal structures were observed on virions at high and low pH, respectively. Individual fusion events with liposomes were also visualized. Fusion appears to be driven by two successive structural rearrangements of G at different sites on the virion. Fusion is initiated at the flat base of the particle. Glycoproteins located outside the contact zone between virions and liposomes then reorganize into regular arrays. We suggest that the formation of these arrays, which have been shown to be an intrinsic property of the G ectodomain, induces membrane constraints, achieving the fusion reaction.

BibTeX:

@article{Libersou:2010,
  author = {Libersou, S. and Albertini, A.A.V. and Ouldali, M. and Maury, V. and Maheu, C. and Raux, H. and De Haas, F. and Roche, S. and Gaudin, Y. and Lepault, J.},
  title = {Distinct structural rearrangements of the VSV glycoprotein drive membrane fusion},
  journal = {Journal of Cell Biology},
  year = {2010},
  volume = {191},
  pages = {199-210},
  doi = {10.1083/jcb.201006116}
}

Lebreton L, Guerre-Chaley J-F, Manuel D and Maury V (2007),
"Performances of digital acquisition for a BC501A detector system",
Proceeding of science.In International Workshop on Fast Neutron Detectors and Applications (FNDA2006) - Signal processing and data analysis techniques (oral)., Jan, 2007. Vol. 025

[Abstract] [BibTeX] [DOI]

Abstract: IRSN uses a BC501A detector system to determine reference fluence energy distribution of neutron fields in the energy range between 1 and 20 MeV. The data acquisition chain associated to this detector consists of NIM standard electronic units which makes the system bulky and not easily movable. Recent developments in the field of numerical electronics offer the opportunity to use digital acquisition system which is compact, more convenient for measurements at workplaces and allows numerical data treatment. Within the framework of collaboration between IRSN and the technological university of Cachan a new digital acquisition system was developed and tested with the BC501A. An Acqiris digital card with a data recording capability of 8 bits range at 4 GHz on two channels was chosen. Specific electronic and signal processing were developed to allow gain stability with high voltage feedback, and to obtain energy information with neutron/ discrimination. The performances (energy resolution, threshold values, dead time and count rate) of the digital acquisition prototype were then compared with those of standard analogical acquisition. In the present state, the comparison results were not satisfying for metrology applications, but the use of new digital cards with 10 bits range is awaited to be fully competitive.

BibTeX:

@article{Lebreton:2007,
  author = {Lebreton, L. and Guerre-Chaley, J.-F. and Manuel, D. and V. Maury},
  title = {Performances of digital acquisition for a BC501A detector system},
  booktitle = {International Workshop on Fast Neutron Detectors and Applications (FNDA2006) - Signal processing and data analysis techniques (oral)},
  journal = {Proceeding of science},
  year = {2007},
  volume = {025},
  doi = {10.22323/1.025.0027}
}

Damé L, Fu X, Kozlowski M, Maury V and Montaron C (2006),
"Frontier full field spectro-imaging with the SOLARNET 3-telescope interferometric breadboard",
In 36th COSPAR Scientific Assembly. Held , in Beijing, China. Meeting abstract from the CDROM, #3517., July (16-23), 2006. Vol. 36

[Abstract] [BibTeX] [DOI]

Abstract: The SOLARNET breadboard consists in 3 small objectives of diameter 60 mm on a 165 mm baseline As such fed by a large siderostat acting as the satellite platform it mimics the SOLARNET space mission using 3 larger 35 cm telescopes on a 1 meter equivalent interferometric baseline Because of its compact design and of an appropriate imaging spectrometer in the focal plane instantaneous imaging in narrow spectral bands is possible The 3-telescopes interferometer design results of an extensive laboratory demonstration program of interferometric imaging of extended objects started 10 years ago The principles of the interferometric compact recombination of the SOLARNET Space Mission capable of large field instantaneous spectro-imaging have been demonstrated in laboratory since 2000 Over the last 5 years the breadboard was completed with active fine pointing and spectro-imaging capabilities to directly observe the Sun and the breadboard was moved to the Grand Sid erostat de Foucault at Meudon Observatory Ultimate refinements in the global three telescopes phase measure by active spatial filtering centering of the cophasing reference field of view have recently been implemented to guarantee cophasing even on a moving changing reference field of view Design and concepts will be explicited and the first interferometric images of the Sun obtained at Meudon Observatory with the breadboard will be presented validating the concept retained for the SOLARNET space mission

BibTeX:

@inproceedings{Dame-2006-COSPAR,
  author = {Damé, L. and Fu, X. and Kozlowski, M. and Maury, V. and Montaron, C.},
  title = {Frontier full field spectro-imaging with the SOLARNET 3-telescope interferometric breadboard},
  booktitle = {36th COSPAR Scientific Assembly. Held , in Beijing, China. Meeting abstract from the CDROM, #3517},
  year = {2006},
  volume = {36},
  doi = {http://adsabs.harvard.edu/abs/2006cosp...36.3517D}
}

Damé L, Fu X, Maury V and Montaron C (2006),
"Multi-aperture Instantaneous Interferometric Imaging of Extended & Moving Objects by Phase Optimized Spatial Filtering",
In ICSO 2006 - COnference on Space Optics ESTEC . Noordwikjk, Nederlands, June (27-30), 2006.

[BibTeX]

BibTeX:

@inproceedings{Dame-2006-ICSO,
  author = {Damé, L. and Fu, X. and Maury, V. and Montaron, C.},
  title = {Multi-aperture Instantaneous Interferometric Imaging of Extended & Moving Objects by Phase Optimized Spatial Filtering},
  booktitle = {ICSO 2006 - COnference on Space Optics ESTEC },
  year = {2006}
}

Damé L, Fu X, Kozlowski M, Maury V and Montaron C (2006),
"The SOLARNET 3-Telescopes Breadboard Development",
In 36th COSPAR Scientific Assembly. Held , in Beijing, China.., July (16-23), 2006. Vol. 36

[BibTeX]

BibTeX:

@inproceedings{Fu-2006-COSPAR,
  author = {Damé, L. and Fu, X. and Kozlowski, M. and Maury, V. and Montaron, C.},
  title = {The SOLARNET 3-Telescopes Breadboard Development},
  booktitle = {36th COSPAR Scientific Assembly. Held , in Beijing, China.},
  year = {2006},
  volume = {36}
}

Lebreton L, Guerre-Chaley J-F, Manuel D and Maury V (2006),
"Performances of digital acquisition for a BC501A detector system",
In International Workshop on Fast Neutron Detectors and Applications (FNDA2006) - Signal processing and data analysis techniques (oral)., April 3, 2006.

[Abstract] [BibTeX]

BibTeX:

@conference{Lebreton-2006-FNDA,
  author = {Lebreton, L. and Guerre-Chaley, J.-F. and Manuel, D. and V. Maury},
  title = {Performances of digital acquisition for a BC501A detector system},
  booktitle = {International Workshop on Fast Neutron Detectors and Applications (FNDA2006) - Signal processing and data analysis techniques (oral)},
  year = {2006}
}

Maury V (2004),
"Étude et réalisation de l'informatique d'acquisistion d'une chaîne de discrimination neutron/gamma",
, Mémoire d'ingénieur Cnam. Thesis at: Conservatoire National des Arts et Métiers. 292 Rue Saint-Martin, 75003 Paris, November, 2004.

[Abstract] [BibTeX]

Abstract: Les travaux présentés dans ce mémoire ont été réalisés dans le cadre d’une collaboration entre le Centre de Ressources d'Ingénierie et d'Initiatives Pédagogiques (CRIIP) et l'Institut de Radioprotection et de Sûreté Nucléaire (IRSN) . L’objet de cette collaboration est l’étude du remplacement de l’électronique analogique associée à un système de détection de neutrons et de photons, utilise par l’Irsn.La solution proposée consiste à utiliser une carte d’acquisition numérique industrielle et un ensemble de logiciels de traitement mathématique. La première maquette de l’application développée sous Windows et implémentant une architecture multithread, nous a permis de commencer les expérimentations et ainsi d’étudier le système d’acquisition, d’en maitriser les paramètres et de les ajuster au mieux pour obtenir une réponse similaire à celle du système analogique. Suite à cette étude, un nouveau logiciel, basé sur une architecture monothread, a été développé sous Linux puis porté sous Windows. Des tests de comparatifs relatifs aux systèmes d’exploitations et aux architectures ont pu être menés. Ils ont mis en évidence que le type de système d’exploitation ou d’architecture logicielle avait peu d’influence sur les performances du système (nombre d’acquisitions), les limites des performances du système étant imposées par la carte d’acquisition. Les choix de l’architecture logicielle et du système d’exploitation ont donc été guidés par la recherche de la simplicité et le souci de la transmission de l’application. Nous avons donc finalement opté pour le système d’exploitation Windows et la version monothread de l’application.

BibTeX:

@mastersthesis{maury:2004,
  author = {Maury, V.},
  title = {Étude et réalisation de l'informatique d'acquisistion d'une cha\ine de discrimination neutron/gamma},
  school = {Conservatoire National des Arts et Métiers},
  year = {2004}
}