609 research outputs found
Preparation for retirement
No full textMonsieur Ullmann et d'autres conférenciers comme Messieurs Bartelemy, Devine et Faessler répondront aux questions écrites auparavent. Ses collègues des services donneront après quelque mots d'introduction un aperçu sur les sujets qui intéressent et répondront aussi aux questions supplémentaires de la salle. M. Faessler donnera entre autre quelques tuyaux utiles et pratiqes concernant des particularités de l'AVS. Des questions sur l'assurance Austria seront aussi abordées
Differential Flatness of Quadrotor Dynamics Subject to Rotor Drag for Accurate Tracking of High-Speed Trajectories
No full textIn this letter, we prove that the dynamical model of a quadrotor subject to linear rotor drag effects is differentially flat in its position and heading. We use this property to compute feedforward control terms directly from a reference trajectory to be tracked. The obtained feedforward terms are then used in a cascaded, nonlinear feedback control law that enables accurate agile flight with quadrotors. Compared to the state-of-the-art control methods, which treat the rotor drag as an unknown disturbance, our method reduces the trajectory tracking error significantly. Finally, we present a method based on a gradient-free optimization to identify the rotor drag coefficients, which are required to compute the feedforward control terms. The new theoretical results are thoroughly validated trough extensive comparative experiments
Heavy ions optical potential at finite temperature calculated using a complex effective interaction
No full textTransverse spin structure of hadrons from lattice QCD
No full textThis paper presents recent lattice QCD calculations of transverse spin densities of quarks in hadrons.22This contribution is based on Refs. [M. Göckeler, et al., Phys. Rev. Lett. 98 (2007) 222001; D. Brömmel, et al., [QCDSF Collaboration]. arXiv:hep-lat/0708.2249]. Based on our simulation results for the tensor generalized form factors, we find substantial correlations between spin and coordinate degrees of freedom in the nucleon and the pion. They lead to strongly distorted transverse spin densities of quarks in the nucleon and a surprisingly non-trivial transverse spin structure of the pion. Following recent arguments by Burkardt [M. Burkardt, Phys. Rev. D 72 (2005) 094020], our results imply that the Boer-Mulders function h1⊥, describing correlations of the transverse spin and intrinsic transverse momentum of quarks, is large and negative for up-quarks in the proton and the π+. This supports the recent hypothesis that all Boer-Mulders functions are alike [arXiv:0705.1573], and also provides additional motivation for future studies of azimuthal asymmetries in π p Drell-Yan production at, e.g., COMPASS. © 2008 Elsevier B.V. All rights reserved.D. Brömmel, M. Diehl, M. Göckeler, Ph. Hägler, R. Horsley, Y. Nakamura, D. Pleiter, P.E.L. Rakow, A. Schäfer, G. Schierholz, H. Stüben, J.M. Zanotti (QCDSF/UKQCD Collaborations
Faessler, Joseph (Death, 1899-07-19)
No full textAddress: 449 Bank St.Age at death: 1 hr.Pg 80/1899/293/M W S/City/Dr. Geo. Eger/F. M. Westerman/St. Mary'sOriginal record filed in drawer labeled 'EWRY-FARRICK'
Faessler, George (Birth, 1893-02-19)
No full textAddress: Ninth St.1316/Pg. 32/1893/M. W./CincinnatiOriginal record filed in drawer labeled 'EWRY-FARRICK'
Extracellular Matrix as a Structural Mediator of Morphological and Homeostatic Information
No full textSéminaire FSER organisé par Dan Rifkin (University Medical Center, New-York) du 4 au 9 octobre 2010 Participants Clair Baldock, Rik Derynck, Harry C. Dietz, Reinhard Faessler, Daniel S. Greenspan, Matthias Hammerschmidt, Penny Handford, Boris Hinz, Thomas D. Mueller, Tomoyuki Nakamura, Edgar M. Pera, Francesco Ramirez, Daniel Rifkin, Lynn Y. Sakai, Dean Sheppard, Pascal Thérond, Ellen Van Obberghen-Schilling, Harlad Von Melchner. -- Compte-rendu From October 4th to October 9th a meeting was h..
Element synthesis in stars
No full textExcept for H-1, H-2, He-3, He-4, and Li-7, originating from the Big Bang, all heavier elements are made in stellar evolution and stellar explosions. Nuclear physics, and in many cases nuclear structure far from stability, enters in a crucial way. Therefore, we examine in this review the role of nuclear physics in astrophysics in general and in particular how it affects stellar events and the resulting nucleosynthesis. Stellar modeling addresses four major aspects: 1. energy generation and nucleosynthesis, 2. energy transport via conduction, radiation or possibly convection, 3. hydrodynamics/hydrostatics, and finally 4. thermodynamic properties of the matter involved. Nuclear Physics enters via nuclear reaction cross sections and nuclear structure (affecting the composition changes and nuclear energy generation), neutrino-nucleon and neutrino-nucleus cross sections (affecting neutrino opacities and transport), and e.g. the equation of state at and beyond nuclear densities which creates a relation between the nuclear many body problem and and hydrodynamic response like pressure and entropy. In the following we review these four topics by highlighting the role and impact of nuclear physics in each of these aspects of stellar modeling. The main emphasis is put on the connection to element synthesis
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