88,968 research outputs found
Ould Cheikh, Abdel Wedoud. "On the (body of the) subject in the Sahara: Mu#ummadhun F#l b. Mutt#l#'s Fat# al-#aqq (nineteenth century)." State, Society and Islam in the Western Regions of the Sahara: Regional Interactions and Social Change. Ed. Francisco Freire. London,: I.B. Tauris, 2022. 231–260.
No full textOuld Cheikh, Abdel Wedoud. "On the (body of the) subject in the Sahara: Mu#ummadhun
F#l b. Mutt#l#’s Fat# al-#aqq (nineteenth century)." State, Society and Islam in the Western
Regions of the Sahara: Regional Interactions and Social Change. Ed. Francisco Freire.
London,: I.B. Tauris, 2022. 231–260. Bloomsbury Collections. Web. 3 Sep. 2022. <http://
dx.doi.org/10.5040/9780755643493.ch-9>
PE-WASUN'04 - Proceedings of the First ACM International Workshop on Performance Evaluation of Wireless Ad Hoc, Sensor, and Ubiquitous Networks: Foreword
No full textCéréales et Pseudo-Céréales de cueillette du Sahara Central (Ahaggar)
No full textGast M., Gaudin-Harding F., Ould-Aoudia M. Céréales et Pseudo-Céréales de cueillette du Sahara Central (Ahaggar). In: Journal d'agriculture tropicale et de botanique appliquée, vol. 19, n°1-3, Janvier-février-mars 1972. pp. 50-58
Internal Stresses in Coherent Multilayers
No full textInternational audienceAlthough the above calculations are standard linear algebra, the expressions for the stress and curvature (Saada, 2008) are, in most cases, tedious and cumbersome. The following remarks are restricted to selected qualitative examples. (i) Starting with a homogeneous bilayer, where the stress-free strain is a pure dilatation, and fo0.01, we find that the relationship between the stress in the film and the curvature obtained by using formula [17] is satisfactory. However, the stress in the substrate exhibits a large variation – its sign is not constant. The stress relaxation resulting from the curvature takes more and more importance as f increases. Not taking into account the stress–curvature coupling may result in an overestimate of the stress of about 20% for f¼0.1. An important consequence of this stress relaxation is a marked decrease of the stored elastic energy of the bilayer as a function of the volume fraction of the film. This property should be incorporated in the modeling of the growth of epitaxial films (Freund, 1993; Saada, 2008). Similar conclusions are reached when the stress-free strain is a pure shear, with the only difference is that the curvature is a twist.(ii) The importance of the stress relaxation due to the stress–curvature coupling is made more evident if one considers a multilayer ABA made of a layer B between two identical layers A, of total thickness w. Let f be the volume fraction of B, and 0rxr(1-0.5f)w be the distance of the center of the layer B to the center of the multilayer. If one neglects the stress–curvature coupling, the stress in either layer is independent of x. Taking into account the stress–curvature coupling, it isfound that, for f¼0.1 and when x increases from 0 to 0.45w, the stress decreases by about 40%, while the curvature increases (Saada, 2008).(iii) An extreme case is that of compositionally graded multilayers. In this case, the effect of the stress–curvature coupling is so large that the approximate calculation used in Section 3 is almost meaningless (Freund and Suresh, 2003; Freund, 1993, 1996; Saada, 2008)
Search for a new light gauge boson with the Crystal Barrel Detector
No full textWe have searched for new light gauge bosons produced in ß 0 , j and j 0 decays by studying the kinematically well-constrained reactions pp ! ß 0 ß 0 P , where P j ß 0 ; j; j 0 decays through the emission of a single photon recoiling against a missing state X (where X is a long-lived weakly interacting particle or X ! ). No signal has been observed and branching ratio upper limits (90 % C:L:) of 6 \Theta 10 \Gamma5 have been obtained for masses of the gauge boson lying between ¸ 65 MeV and 125 MeV (ß 0 decay), 6 \Theta 10 \Gamma5 , for X masses between ¸ 200 MeV and 525 MeV (j decay), and 4 \Theta 10 \Gamma5 , for X masses between ¸ 50 MeV and 925 MeV (j 0 decay). The ß 0 -decay limit represents a factor of 4 to 8 improvement when compared to the existing limit, whereas the j and j 0 decay limits have been measured for the first time, thereby extending the mX range from 130 MeV up to 925 MeV
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