On the 3D secular dynamics of radial-velocity-detected planetary systems

Aims. To date, more than 600 multi-planetary systems have been discovered. Due to the limitations of the detection methods, our knowledge of the systems is usually far from complete. In particular, for planetary systems discovered with the radial velocity (RV) technique, the inclinations of the orbital planes, and thus the mutual inclinations and planetary masses, are unknown. Our work aims to constrain the spatial configuration of several RV-detected extrasolar systems that are not in a mean-motion resonance. Methods. Through an analytical study based on a first-order secular Hamiltonian expansion and numerical explorations performed with a chaos detector, we identified ranges of values for the orbital inclinations and the mutual inclinations, which ensure the long-term stability of the system. Our results were validated by comparison with n-body simulations, showing the accuracy of our analytical approach up to high mutual inclinations (approx. 70{\deg}-80{\deg}). Results. We find that, given the current estimations for the parameters of the selected systems, long-term regular evolution of the spatial configurations is observed, for all the systems, i) at low mutual inclinations (typically less than 35{\deg}) and ii) at higher mutual inclinations, preferentially if the system is in a Lidov-Kozai resonance. Indeed, a rapid destabilisation of highly mutually inclined orbits is commonly observed, due to the significant chaos that develops around the stability islands of the Lidov-Kozai resonance. The extent of the Lidov-Kozai resonant region is discussed for ten planetary systems (HD 11506, HD 12661, HD 134987, HD 142, HD 154857, HD 164922, HD 169830, HD 207832, HD 4732, and HD 74156).Comment: Accepted for publication in A&

Blow-up for the stochastic nonlinear Schrodinger equation with multiplicative noise

We study the influence of a multiplicative Gaussian noise, white in time and correlated in space, on the blow-up phenomenon in the supercritical nonlinear Schrodinger equation. We prove that any sufficiently regular and localized deterministic initial data gives rise to a solution which blows up in arbitrarily small time with a positive probability.Comment: Published at http://dx.doi.org/10.1214/009117904000000964 in the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org

Reducing Discrimination through Norms or Information: Evidence from a Field Experiment on Student Evaluations of Teaching

We conduct a field experiment to assess the impact of two different interventions designed to reduce gender biases in student evaluations of teaching (SET). In the first intervention, students received a normative statement by email, essentially reminding them that they should not discriminate in SETs. In the second intervention, the normative statement was augmented with precise information on how other students in the exact same situation had discriminated against female teachers in the past. While the pure normative statement had no significant impact on SETs, the informative statement appears to have reduced gender biases against female teachers. This effect mainly comes from a change in male students’ evaluation of female teachers

Reducing Discrimination through Norms or Information: Evidence from a Field Experiment on Student Evaluations of Teaching

We conduct a field experiment to assess the impact of two different interventions designed to reduce gender biases in student evaluations of teaching (SET). In the first intervention, students received a normative statement by email, essentially reminding them that they should not discriminate in SETs. In the second intervention, the normative statement was augmented with precise information on how other students in the exact same situation had discriminated against female teachers in the past. While the pure normative statement had no significant impact on SETs, the informative statement appears to have reduced gender biases against female teachers. This effect mainly comes from a change in male students’ evaluation of female teachers

Reducing Discrimination in the Field:Evidence from an Awareness Raising Intervention Targeting Gender Biases in Student Evaluations of Teaching

This paper presents the results of a field experiment designed to reduce gender discrimination in student evaluations of teaching (SET). In the first intervention, students receive a normative statement reminding them that they should not discriminate in SETs. In the second intervention, the normative statement includes precise information about how other students (especially male students) have discriminated against female teachers in previous years. The purely normative statement has no significant impact on SET overall satisfaction scores, suggesting that a blanket awareness-raising campaign may be inefficient to reduce discrimination. However, the informational statement appears to significantly reduce gender discrimination. The effect we find mainly comes from a change in male students’ evaluation of female teachers

Reducing Discrimination through Norms or Information: Evidence from a Field Experiment on Student Evaluations of Teaching

We conduct a field experiment to assess the impact of two different interventions designed to reduce gender biases in student evaluations of teaching (SET). In the first intervention, students received a normative statement by email, essentially reminding them that they should not discriminate in SETs. In the second intervention, the normative statement was augmented with precise information on how other students in the exact same situation had discriminated against female teachers in the past. While the pure normative statement had no significant impact on SETs, the informative statement appears to have reduced gender biases against female teachers. This effect mainly comes from a change in male students’ evaluation of female teachers

Pilotage des flux communicationnels du centre e-learning HES-SO Cyberlearn

Le but de ce travail consiste à amener une réponse à la question de recherche suivante : « Où se situent les flux de communication du centre par rapport à ceux d’autres universités en matière de e-learning et comment développer un outil de pilotage qui permettra de résoudre la problématique ? »