60 research outputs found
Distorted neutrino oscillations from time varying cosmic fields
No full textCold, ultralight (≪eV) bosonic fields can induce fast temporal variation in neutrino couplings, thereby distorting neutrino oscillations. In this paper, we exploit this effect to introduce a novel probe of neutrino time variation and dark matter at long-baseline experiments. We study several representative observables and find that current and future experiments, including DUNE and JUNO, are sensitive to a wide range of model parameters over many decades in mass reach and time-variation periodicity
Boosted dark matter at neutrino experiments
No full textCurrent and future neutrino experiments can be used to discover dark matter, not only in searches for dark matter annihilating to neutrinos, but also in scenarios where dark matter itself scatters off standard model particles in the detector. In this work, we study the sensitivity of different neutrino detectors to a class of models called boosted dark matter, in which a subdominant component of a dark sector acquires a large Lorentz boost today through annihilation of a dominant component in a dark matter-dense region, such as the galactic Center or dwarf spheroidal galaxies. This analysis focuses on the sensitivity of different neutrino detectors, specifically the Cherenkov-based Super-K and the future argon-based DUNE to boosted dark matter that scatters off electrons. We study the dependence of the expected limits on the experimental features, such as energy threshold, volume and exposure in the limit of constant scattering amplitude. We highlight experiment-specific features that enable current and future neutrino experiments to be a powerful tool in finding signatures of boosted dark matter
La régulation constitutionnelle de la corégulation législative
No full textInternational audience(Cons. const. 20 déc. 2019, n° 2019-794 DC, Loi d'orientation des mobilités, AJDA 2020. 9 ; D. 2020. 1012, obs. V. Monteillet et G. Leray ; ibid. 1588, obs. J.-C. Galloux et P. Kamina ; JA 2020, n° 611, p. 8, obs. X. Delpech ; AJCT 2020. 5, obs. D. Necib ; RDT 2020. 42, obs. B. Gomes ; Dr. soc. 2020. 439, note K. Van Den Bergh ; AJ contrat 2020. 60, étude T. Pasquier ; RTD civ 2020. 581, obs. P. Deumier
Necip El-Kilani hayatı-eserleri ve 20. yüzyıl arap edebiyatındaki yeri
No full textBu çalıĢmada, XX. yüzyıl Arap edebiyatının öncülerinden birisi olan Necib el-Kîlânî ‟nin hayatı, eserleri, edebî kiĢiliğini iĢledik. AraĢtırmamız bir giriĢ ve üç bölümden oluĢmaktadır. GiriĢ bölümü iki kısımdır. Birinci kısımda Arap edebiyatı tarihiyle ilgili kısaca bilgi verilmiĢtir. Ġkinci kısmında ise Mısır ile ilgili genel bir bilgi sunulmaktadır. yazarın hayatıyla ilgilidir. Bu bölümde, yazarın hayatı Necib el-Kîlânî‟ye göre dönemin siyasi olayları, doğumu, ailesi ve çocukluğu, gençliği ve tahsili, edebî hayatı, siyasî hayatı, Ģahsiyeti ve ölümü baĢlıkları altında ele alınmıĢtır. Ġkinci bölüm, yazarın edebi yönünü içerir. Bu bölümde, el-Kîlânî‟nin üslubu, romanının özellikleri, edebi düĢünceleri, etkilendiği edebiyatçılar yer almaktadır. Üçüncü bölümde ise müellifin 20. yüzyıl Arap edebiyatındaki yeri ele alınmaktadır. IVIn this study, I have been carried out one of the leaders in the twentieth century Arabic literature Necib al-Kîlânî‟s life, works, literary character. My research consists of introduction chapter and three other chapters. The introduction chapter is divided into two sections. In the first section of the introduction chapter, there is brief information about history of the Arabic literature. The general information of Egypt, where the writer is from, is given in the second section of the same chapter. The first chapter is related with the writer‟s life. In this chapter writer‟s life mentioned with these subchapters; political events of the that period from the perspective of Necib el-Kîlanî, his birth, his family and childhood, his youth and education, his literary life, his character and his death. The second chapter is based on writer‟s literary aspects. In this chapter his style, properties of his novels, his literary aspects, authors whom el-Kîlanî affected from and his thoughts of Islamic literature and Islamic writers. The last chapter is about his place among 20th century Arabic literature. This chapter consists of author‟s position in the literature in 20th century Arabic world and his works
La régulation constitutionnelle de la corégulation législative
No full textInternational audience(Cons. const. 20 déc. 2019, n° 2019-794 DC, Loi d'orientation des mobilités, AJDA 2020. 9 ; D. 2020. 1012, obs. V. Monteillet et G. Leray ; ibid. 1588, obs. J.-C. Galloux et P. Kamina ; JA 2020, n° 611, p. 8, obs. X. Delpech ; AJCT 2020. 5, obs. D. Necib ; RDT 2020. 42, obs. B. Gomes ; Dr. soc. 2020. 439, note K. Van Den Bergh ; AJ contrat 2020. 60, étude T. Pasquier ; RTD civ 2020. 581, obs. P. Deumier
Boosting (in)direct detection of dark matter
No full textThesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2017.Cataloged from PDF version of thesis.Includes bibliographical references (pages 153-178).In this thesis, I study the expected direct and indirect detection signals of dark matter. More precisely, I study three aspects of dark matter; I use hydrodynamic simulations to extract properties of weakly interacting dark matter that are relevant for both direct and indirect detection signals, and construct viable dark matter models with interesting experimental signatures. First, I analyze the full scale Illustris simulation, and find that Galactic indirect detection signals are expected to be largely symmetric, while extragalactic signals are not, due to recent mergers and the presence of substructure. Second, through the study of the high resolution Milky Way simulation Eris, I find that metal-poor halo stars can be used as tracers for the dark matter velocity distribution. I use the Sloan Digital Sky Survey to obtain the first empirical velocity distribution of dark matter, which weakens the expected direct detection limits by up to an order of magnitude at masses </~ 10 GeV. Finally, I expand the weakly interacting dark matter paradigm by proposing a new dark matter model called boosted dark matter. This novel scenario contains a relativistic component with interesting hybrid direct and indirect detection signatures at neutrino experiments. I propose two search strategies for boosted dark matter, at Cherenkov-based experiments and future liquid-argon neutrino detectors.by Lina Necib.Ph. D
Quand la loi est rédigée par des prestataires privés
No full textInternational audience(Cons. const. 20 déc. 2019, n° 2019-794 DC, Loi d'orientation des mobilités, AJDA 2020. 9 ; D. 2020. 1012, obs. V. Monteillet et G. Leray ; ibid. 1588, obs. J.-C. Galloux et P. Kamina ; JA 2020, n° 611, p. 8, obs. X. Delpech ; AJCT 2020. 5, obs. D. Necib ; RDT 2020. 42, obs. B. Gomes ; Dr. soc. 2020. 439, note K. Van Den Bergh ; AJ contrat 2020. 60, étude T. Pasquier ; Dr. adm. 2020, n° 4, Comm. 19, J.-F. Kerléo ; JCP A 2020. Actu. 46, obs. H. Pauliat ; RTD civ 2020. 586, obs. P. Deumier
Quand la loi est rédigée par des prestataires privés
No full textInternational audience(Cons. const. 20 déc. 2019, n° 2019-794 DC, Loi d'orientation des mobilités, AJDA 2020. 9 ; D. 2020. 1012, obs. V. Monteillet et G. Leray ; ibid. 1588, obs. J.-C. Galloux et P. Kamina ; JA 2020, n° 611, p. 8, obs. X. Delpech ; AJCT 2020. 5, obs. D. Necib ; RDT 2020. 42, obs. B. Gomes ; Dr. soc. 2020. 439, note K. Van Den Bergh ; AJ contrat 2020. 60, étude T. Pasquier ; Dr. adm. 2020, n° 4, Comm. 19, J.-F. Kerléo ; JCP A 2020. Actu. 46, obs. H. Pauliat ; RTD civ 2020. 586, obs. P. Deumier
INFLUENCE DU CHAMP MAGNETIQUE SUR LE COMPORTEMENT EN USURE D’UN OUTIL DE COUPE DURANT LES OPERATIONS DE CHARIOTAGE
No full textDans ce travail, nous avons étudié l’influence du champ magnétique sur le comportement en usure d’un outil durant des opérations en chariotage à partir de la perte de masse durant la coupe et la nature de l’usure. Lors de nos expériences, nous avons constaté l’existence d’une valeur critique du champ magnétique égale à 0.34 T, qui provoque une résistance non négligeable à l’usure et détermine sa nature en ce qui concerne ce facteur qui a une influence directe sur le comportement en usure de l’outil notamment la vitesse de coupe. Nous avons constaté que le champ magnétique diminue la perte de masse et préserve la nature de l’arête tranchante de l’outil. Dans certaines conditions, nous avons remarqué qu’il conduit en changement de la nature de l’usure
Influence of the magnetic field on the wear behavior of a cutting tool during the turning operations
No full textThis study concerns tests carried out without lubrication on a universal lathe to study the influence of the magnetic field on the wear of a cutting tool made of metallic carbide. The tests parameters are: the intensity of the magnetic field (from 0 to 28.5 kA.m-1), the cutting speed (from 6 to 136 m.min-1), the advance speed and the cut depth (pass). Both of the previous parameters are fixed respectively at 0.125 mm.rev-1 and 0.5 mm. The material being cut is made of XC38 steel. The tool wear is evaluated by weighing method (before and after each test). The results showed that the magnetic field has an influence on wear and that there is a critical value (H = 16.5 kA.m-1) for which wear is minimum. Also, the scanning electron microscope (SEM) and optical microscope observations revealed the existence of three types of wear that are: flank wear, crater wear and wear by plastic deformation. Moreover, we concluded that, the increase of the magnetic field modifies the shape and the morphology of chips and rises the contact temperature.</jats:p
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