Search results for "Raj"

Time optimal control of a satellite with two rotors

2001

International audience; The aim of this work is to investigate the structure of time-optimal trajectories for a control system modelizing a satellite with two rotors attached along its two fixed axes. Our results extend to the general case those obtained by Sussmann and Tang in an unpublished paper where they treat a particular case described below. We end up finding a sufficient family of four parameters trajectory types. The main tools used are the Pontryagin Maximum Principle, switching functions and envelope theory. © 2001 EUCA.

Synergic algorithms for the planning and the intelligent following of a trajectory for non-holonomic vehicles

2008

Although there are many studies about two wheels non-holonomic vehicles, in order to simplify the problem the planning and the following of trajectories or paths are generally considered two different phases. In this paper, two algorithms for the synergic working of trajectory planning with intelligent trajectory following are presented. The "trajectory shape" characteristics obtained in the planning phase are used for the efficient trajectory following. From the shape, in order to follow the trajectory, an intelligent controller calculates, without further elaboration, the reference wheels velocity of the vehicle. The knowledge of trajectory shape characteristics and curvature constraints …

A nonlinear dynamical approach to the path correction of multi-steering articulated vehicles

2020

When designing articulated tractor-trailer systems, engineers should take care to contrast some undesired phenomena associated with the lateral dynamics: the path off-tracking, namely the trajector...

La cultura custodita nella biblioteca del barone

2009

L'articolo propone un profilo culturale di Enrico Pirajno barone di Mandralisca (1809-1864)e uno studio sintetico sulla sua biblioteca.

Formation enseignante et trajectoire : le cas des enseignants en seconde carrière

2023

Comprendre la mobilisation des MOOC dans les trajectoires individuelles. Identification de registres d'usages

2017

International audience

Quels usages des MOOC ? Pour quels effets dans les trajectoires professionnelles ?

2017

International audience

Quelle attractivité pour les études scientifiques dans une société de la connaissance ?

2014

Depuis une vingtaine d'années, le thème de l'attractivité des filières scientifiques dans l'enseignement supérieur a suscité de nombreuses controverses questionnant, par exemple, l'intérêt des jeunes pour les sciences, la manière de les enseigner ou même la fuite des cerveaux. Cet ouvrage apporte un éclairage longitudinal à ces débats en regardant comment la question de l'attractivité se pose dans les parcours scolaires et universitaires, puis dans les trajectoires professionnelles des jeunes diplômés. À partir de l'exploitation de différentes enquêtes, les auteurs soulignent l'importance des stratégies d'orientation et d'insertion professionnelle des élèves et étudiants face à un marché du…

Importance of Factors H and I for the Adherence of C3b-Coated Erythrocytes to Cells

1983

Abstract The role of cell membrane-associated human factor H for the binding of cell-bound Cab to complement receptor-carrying (CR + ) cells was investigated. Pretreatment of CR + cells with antibodies to factor H inhibited the adherence of Cab-coated red cells to human tonsil lymphocytes (TL) and peripheral blood monocytes (Mo). The Cab receptor reactivity of human polymorphonuclear leucocytes (PMN) was not influenced and the one of Raji lymphoblastoid cells only slightly influenced; iC3b and Cad receptor reactivity was in no case affected. When diisopropylfluorophosphate (DFP) in a concentration of 0.1 mM was present during pretreatment of the CR + cells with anti H, the antibodies gained…

Role of β1H for the binding of C3b-coated particles to human lymphoid and phagocytic cells

1981

Coating of EAC14oxy23b with highly purified human serum beta 1H globulin (beta 1H) led to acceleration of rosette formation with human peripheral blood lymphocytes (PBL), tonsil lymphocytes, B lymphoblastoid (Raji) cells, granulocytes and monocytes. This reaction was discernible from C3bi-dependent rosette formation. Enhancement of rosette formation of C3b cells by beta 1H was most effective at limiting amounts of C3 per EAC14oxy23b. The beta 1H effect was not due to trace contamination with C3b inactivator. beta 1H-dependent rosette formation with the various lymphoid and phagocytic cells could be suppressed by the F(ab')2 fragment of anti-beta 1H suggesting beta 1H-mediated binding of bet…