1,085 research outputs found
Data for - MuFFIN - Modelling Foraging Fitness in Marine Predators
No full textThis repository contains information on the raw GPS-Time Depth Recorder-accelerometer data collected from two penguin species, The Little penguin (Eudyptula minor) and the Adélie penguin (Pygoscelis adeliae) published in:
"The role of individual variability on the predictive performance of machine learning applied to large bio-logging datasets."
Article DOI: 10.1038/s41598-022-22258-1
Marianna Chimienti * , Akiko Kato, Olivia Hicks, Frédéric Angelier, Michaël Beaulieu, Jazel Ouled-Cheikh, Coline Marciau, Thierry Raclot, Meagan Tucker, Danuta Maria
Wisniewska, Andre Chiaradia, Yan Ropert-Coudert
*Corresponding author. [email protected]
This study was supported by:
H2020-Marie Skłodowska-Curie Individual Fellowship, project number 890284, "Modelling Foraging Fitness in Marine predators (MuFFIN)", awarded to Marianna Chimienti
Nature of dataset: quantitative
Purpose of dataset: collect movement data from penguin species
Scope of dataset: quantify movement patterns in penguin species while foraging during the breeding season<br
Millimeter And Sub-millimeter Spectroscopy Of Doubly Deuterated Acetaldehyde (cd2hcho)
No full textIn the last years the number of multi-deuterated molecules detected in the Interstellar Medium (ISM) increased substantially. These molecules are found to be more abundant than expected when taking into account the ISM deuterium abundance (D/H = 2.0 0.1 10, Drozdovskaya {\em et al.}\footnote{Drozdovskaya, M. N., Coudert, L. H., Margulès, L., Coutens, A., Jorgensen, J. K., Manigand, S., 2022, A\&A, in press} and references therein). In order to better understand the nature of deuterium fractionation, and the interplay of the chemistry in the gas phase and on the surface of dust grains, chemical models need to be constrained by observations of singly- and multi-deuterated molecules. Doubly deuterated acetaldehyde (CDHCHO) has not been detected in the ISM yet as it has been studied in the laboratory only up to 40 GHz (Turner Cox\footnote{Turner, P. H., Cox, A. P., 1976, Chem. Phys. Lett., 42, 1}, Turner {\em et al.}\footnote{Turner, P. H., Cox, A. P., Hardy, J. A., 1981, J. Chem. Soc., 77, 1217-1231}) and hence lacks an extensive spectroscopic study, in contrast with the singly-deuterated forms CHDCHO and CHCDO that were detected towards the protostellar core IRAS16293-2422B (Coudert {\em et al.}\footnote{Coudert, L. H., Margulès, L., Vastel, C., Motiyenko, R., Caux, E., Guillemin, J.-C., 2019, A\&A, 624, A70}). In order to allow the first detection of CDHCHO in the ISM, and to understand its deuterium fractionation, we are studying the rotational spectrum of CDHCHO in the millimetre and sub-millimeter frequency range.
This work should allow us to obtain an accurate spectral catalogue for CDHCHO, which we will use to search for this molecule in star-forming regions
Epizootic rabbit enteropathy. Study of early phenomena with fresh inoculum and attempt at inactivation
No full text[EN] Using 180 35-day-old SPF rabbits, this study used the effectiveness of bacitracin as a tool for acquiring more information on the various phases of ERE, in particular during the hours inoculation. Five groups of animals were used, including 3 treatments with Bacivet S(R) (bacitracin) at different times from inoculation, with the standard inoculum TEC3. Three parameters were studied: growth, mortality and stomach noises (borborygmi). A significant fall in growth rate was observed during the first 18 hours following the inoculation in all the inoculated groups, both medicated and not medicated. Treatment with bacitracin eliminated mortality and borborygmi, but not the initial fall in growth rate. Treatment starting 18 hours after inoculation is less effective during the acute phase than the preventive treatment. With a preventive treatment interrupted as soon as 18 hours after inoculation, a delay of several days was observed before the appearance of the disease (fall in growth rate, manifestation of borborygmi) and total mortality was reduced. Very few pathogens can explain this early fall in growth rate. Bacitracin is an antibiotic which offers good control of the disease, and probably of the pathogen but not of the physio-pathological disturbances in the first few hours. The intervention of an exogenic toxin in the first hours of contamination seems likely. Borborygmi are important criteria. The intensity and/or frequency could be used as semi-quantitative criteria to characterize the disease and for the prognosis. In a simultaneous trial, a group was contaminated with the same inoculum, heated for 10 min at 55°C, in order to obtain more information on the type of pathogen involved in the etiology of ERE. This treatment did not modify the virulence of the inoculum.This research received financial help from the Ministry for Agriculture of France (DGAL - ITAVI).Coudert, P.; Licois, D. (2005). Epizootic rabbit enteropathy. Study of early phenomena with fresh inoculum and attempt at inactivation. World Rabbit Science. 13. https://doi.org/10.4995/wrs.2005.515SWORD1
GLOBAL ANALYSIS OF THE WATER MOLECULE SPECTRUM BEYOND THE SECOND TRIAD
No full textLanquetin, Coudert, and Camy-Peyret, J. Molec. Spectrosc. 195, 54 (1999); Lanquetin, Coudert, and Camy-Peyret, J. Molec. Spectrosc. 206, 83 (2001); and Coudert, Pirali, Vervloet, Lanquetin, and Camy-Peyret, J. Molec. Spectrosc. 2004, submitted. Bunker and Moss, J. Molec. Spectrosc. 80, 217 (1980). Partridge and Schwenke, J. Chem. Phys. 106, 4618 (1997).Author Institution: Laboratoire de Photophysique Mol\'{e}culaire, C.N.R.S., B\^{a}t. 350, Universit\'{e} Paris-SudThe spectrum of the water molecule has been the subject of a very large number of theoretical investigations. These are motivated by the importance of this molecule, by the availability of a large body of high-resolution data, and by the fact that it is a theoretically challenging molecule displaying a strong vibration-rotation coupling leading to an anomalous centrifugal distortion. In this paper, using the same ideas as in several previous in which satisfactory analyses of the water molecule rovibrational energy were performed up to the second triad, an effective rotation-vibration Hamiltonian will be built and used to account for the rovibrational energy of water up to the the first hexad. In agreement with Bunker and this effective rotation-vibration Hamiltonian is obtained starting from the exact Hamiltonian of the molecule written with Radau coordinates and adding the kinetic energy-like terms arising from the breakdown of the Born-Oppenheimer approximation. The effective Hamiltonian thereby obtained accounts for all three vibrational modes of the molecule and for the overall rotation. Making use of the potential energy function obtained by Partridge and the Schr\""{o}dinger equation for this effective Hamiltonian is then solved and rovibrational levels are obtained. In the paper, the theoretical formalism will be introduced and we hope to be able to show results concerning a global analysis of the rovibrational levels of water up to the first hexad
MAGNETIC SPIN-TORSION COUPLING IN METHANOL
No full textThe hyperfine structure of non-rigid molecules in which
hyperfine coupling arises from equivalent nuclei that can be
exchanged by large amplitude motions is of great interest and
lead to unexpected results. In the non-rigid (CD)
and (DO) dimers, the hyperfine structure arising for
nondegenerate tunneling sublevels can be accounted for using
an effective quadrupole coupling Hamiltonian with the same
coupling constant for all four deuterium atoms.footnote{Bhattacharjee, Muenter, and Coudert, {em
J. Chem. Phys.}~{bf 97} (1992) 8850; and Stahl and
Coudert, {em J. Mol. Spectrosc.}~{bf 157} (1993) 161.}
In the non-rigid species CDCOH and HCOOCH, the large
amplitude torsional motion leads to hyperfine patterns which
are qualitatively dependent on the torsional symmetry of the
levels.footnote{Coudert and Lopez, {em J.
Mol. Spectrosc.}~{bf 239} (2006) 135; and Tudorie,
Coudert, Huet, Jegouso, and Sedes, {em
J. Chem. Phys.}~{bf 134} (2011) 074314.} The interaction
between a large amplitude torsional motion and the hyperfine
coupling may also lead to a less known hyperfine effect,
the so-called magnetic spin-torsion coupling, which was
first studied by Heuvel and Dymanusfootnote{Heuvel and Dymanus, {em J. Mol. Spectrosc.}~{bf 45}
(1973) 282 and {em ibid} {bf 47} (1973) 363.} and which has
not yet been conclusively evidenced.
In this talk, the magnetic hyperfine structure of the non-rigid
methanol molecule will be investigated experimentally and
theoretically. 13 hyperfine patterns were recorded using two
molecular beam microwave spectrometers. These patterns, along
with previously recorded ones, were analyzed in an attempt
to evidence the effects of the magnetic spin-torsion coupling.
The theoretical approach setup to analyze the observed data
accounts for the spin-torsion coupling, in addition to the familiar
magnetic spin-rotation and spin-spin couplings, and relies
on symmetry considerations to build a hyperfine coupling
Hamiltonian and a spin-rotation-torsion wavefunction compatible
with the Pauli exclusion principle.
In the talk, the results of the analysis will be presented.
The hyperfine coupling parameters retrieved will be discussed
and we hope to be able to conclusively evidence the effects
of the magnetic spin-torsion.Made available in DSpace on 2016-01-05T20:05:01Z (GMT). No. of bitstreams: 3
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Terahertz spectroscopy of deuterated acetaldehyde: CH2DCHO
No full textThis study follows our recent investigations about deuterated methyl-top species of complex organic molecules: methanol,\footnote{Coudert, L. H.; {\em et al.} {\em J. Chem. Phys.}~{\bf140}, (2014) 64307} methyl formate,\footnote{Coudert, L. H.; {\em et al.} {\em ApJ}~{\bf779}, (2013) 119} and dimethyl ether.\footnote{Richard, C.; {\em et al.} {\em A\&A}~{\bf552}, (2013) A117} In particular these works led the first ISM detection of \chem{HCOOCH_2D} and \chem{CH_2DOCH_3}.
Acetaldehyde is not very abundant in the ISM, but this is a very interesting case from the spectroscopic point of view as it is an intermediate case between methyl formate and methanol. In the normal species of acetaldehyde, the barrier to internal rotation\footnote{Smirnov, I. A.; {\em et al.} {\em J. Mol. Spectrosc.} ~{\bf295} (2014) 44} V is 408cm which is close to the value in methyl formate\footnote{Ilyushin, V.; {\em et al.} {\em J. Mol. Spectrosc.} ~{\bf255} (2009) 32}: 373 cm. However, the value of the Coriolis coupling constant is
0.33 in acetaldehyde which is a much larger value than in methyl formate,
0.08, meaning that the coupling between the torsion and the overall rotation
is more important. \\
The sample was not a commercial one and half of its amount is the normal
species which leads to a more difficult line assignment.
The spectra were recorded in Lille between 75 and 950~GHz with a solid-state
submillimeter-wave spectrometer. The starting point of the analysis was the centimeter-wave measurements carried out for the sym and asym- conformers.\footnote{Turner, P. H.; and Cox, A. P. {\em Chem. Phys. Lett.}~{\bf42}, (1976) 84 - Turner, P. H.; Cox, A. P.; and Hardy, J. A. {\em J.C.S. Farady Trans.}~{\bf2}, (1981) 1217}
A comparison between the approach developed for deuterated methyl formate
(\chem{HCOOCH_2D}), based on the water dimer formalism, and that designed
recently for deuterated methanol (\chem{CH_2DOH}) will be presented.\\
\em{This work is supported by the CNES and the Action sur Projets de l'INSU, PCMI.}Made available in DSpace on 2014-09-17T16:55:39Z (GMT). No. of bitstreams: 3
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Rapport de visite de M. Coudert Août 1954
No full textCarnet de feuilles agrafées et dactylographiées au recto de 11 pages, décrivant l\u27activités minières de la « Société Nouvelle de St Elie et Adieu-Vat
The rotation-torsion spectrum of doubly deuterated methanol cd2hoh
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Previous issue date: 22Doubly deuterated methanol CDHOH is a non-rigid molecule
displaying internal rotation of its asymmetrical CDH methyl
group. Like the isotopic species of methanol with a symmetrical
CH or CD group, it displays a strong rotation-torsion
Coriolis coupling. Unlike these species, it also displays a
dependence of its generalized inertia tensor on the angle of
internal rotation. Its complicated rotation-torsion spectrum
was investigated in the microwave,\footnote{Liu \& Quade,
{\em J.\ Mol.\ Spectrosc.}~{\bf 146} (1991) 252; Su, Liu, \&
Quade, {\em J.\ Mol.\ Spectrosc.}~{\bf 149} (1991) 557; Quade,
Liu, Mukhopadhyay, \& Su, {\em J.\ Mol.\ Spectrosc.}~{\bf 192}
(1998) 378; Su \& Quade, {\em J.\ Chem.\ Phys.}~{\bf 90} (1989)
1396} submillimeter-wave,\footnotetext[2]{Ndao, Tchana, Coudert,
Motiyenko, Margul\`es, Barros, Manceron, \& Roy, {\em J.\ Mol.\
Spectrosc.}~{\bf 326} (2015) 136}\footnotetext[3]{Mukhopadhyay,
{\em Inf.\ Phys.\ Tech.}~{\bf 75} (2016) 139; {\em ibid.}~{\bf
76} (2016) 116} terahertz, and FIR
domains. Although more than 3000 transitions have been assigned
so far, no global analysis, like the one performed for the
similar species CHDOH,\footnotetext[4]{Coudert, Zemouli,
Motiyenko, Margul\`es, \& Klee, {\em J.\ Chem.\ Phys.}~{\bf 140}
(2014) 064307} has been carried out.
In this talk, new assignments in the terahertz and FIR spectra
of CDHOH will be reported. Parallel and perpendicular
transitions, characterized by a higher -value than in our
previous investigation, could be identified up to for
the three lowest lying torsional states. Using the theoretical
approach developed for CHDOH, a global analysis of the
available high-resolution data has been attempted in order
to check the new assignments and to retrieve spectroscopic
parameters such as those describing the hindering potential and
the generalized inertia tensor.\footnotetext[5]{Liu \& Quade,
{\em J.\ Mol.\ Spectrosc.}~{\bf 146} (1991) 238; El Hilali,
Coudert, Konov, \& Klee, {\em J.\ Chem.\ Phys.}~{\bf 135}
(2011) 194309} So far, this global analysis has been
restricted to transitions with as rotation-torsion
levels with are affected by strong rotation-torsion
couplings and cannot be properly modeled. Hopefully this issue
will be dealt with by the time of the Symposium
The Bending-rotation Approach Applied To The Methylene Radical Ch<sub>2</sub>
No full text"Quasi-linear molecules display a large amplitude bending
mode allowing them to sample their linear configuration.
This leads to a strong coupling between the overall
rotation and the bending mode and to a singularity in their
Hamiltonian. Quasi-linearity has been extensively studied
in many species including the closed shell water molecule
and the open shell amidogen (NH) and methylene (CH)
radicals. For these three species, the barrier to linearity ranges
from 12\,000~cm for NH to less than 2000~cm
for CH.\footnote{Jungen, Hallin, and Merer, {\em
Molec.\ Phys.}~{\bf 40} (1980) 25; Bunker, Jensen, Kraemer,
and Beardsworth, {\em J.\ Chem.\ Phys.}~{\bf 85} (1986) 3724;
Partridge and Schwenke, {\em J.\ Chem.\ Phys.}~{\bf 106}
(1997) 4618} Their rovibrational energy levels can be
computed with almost spectroscopic accuracy using variational
approaches or, if a higher accuracy is required, with reduced
dimensionality models such as the effective Bending-Rotation
approach,\footnote{Coudert, Marin-Drumel, and Pirali,
{\em J.\ Mol.\ Spectrosc.}~{\bf 303} (2014) 36} already applied to treat the anomalous
centrifugal distortion of the water molecule
and of the amidogen radical.\footnote{TD03,
Martin-Drumel, Pirali, and Coudert, 72nd ISMS, Urbana-Champaign,
June 19--23, 2017}
In this talk, the Bending-Rotation approach is extended,
adding the spin-rotation and spin-spin fine couplings,
so as to be used in the case of the methylene radical.
The new approach is applied to the fitting of high-resolution
data pertaining to this species. In addition to the ground
state data previously analyzed,\footnote{Br\""unken,
M\""uller, Lewen, and Giesen, {\em J.\ Chem.\ Phys.}~{\bf 123}
(2005) 164315} the data set includes FIR transitions
belonging to the band.\footnote{Sears, Bunker, and McKellar, {J.\ Chem.\ Phys.}~{\bf 77} (1982) 5363;
McKellar, Yamada, and Hirota, {\em J.\ Chem.\ Phys.}~{\bf 79} (1983) 1220; and
Marshall and McKellar, {\em J.\ Chem.\ Phys.}~{\bf 85} (1986) 3716} 336 transitions were reproduced
with a standard deviation of 1.3 using 42 spectroscopic
parameters.\footnote{Coudert, {\em J.\ Chem.\
Phys.}~{\bf 153} (2020) 144115} In the talk, the results
of this analysis will be reported and the dependence on the
bending angle retrieved for the spin-rotation and spin-spin
fine couplings will be discussed. We will also try to see if
the analysis results can be further improved."Made available in DSpace on 2021-09-24T21:09:33Z (GMT). No. of bitstreams: 2
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