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Le tapis de Sierpinski -itération 4-
No full textThe Sierpinski carpet -iteration 4- (Le tapis de Sierpinski -itération 4-
Vue artistique de Monument Valley au lever du Soleil avec la Grande Ourse
No full textArtistic view of Monument Valley at sunrise with the Great Bear (Vue artistique de Monument Valley au lever du Soleil avec la Grande Ourse
Reductive Passerini/Tsuji-Trost Strategy towards beta,gamma-Unsaturated Amides
No full textInternational audienceThe Passerini reaction of α,β-unsaturated aldehydes with formic acid followed by a reductive Tsuji-Trost reaction affords β,γ-unsaturated amides. The overall process may be viewed as a one-carbon homologation of unsaturated aldehydes into amides
Searches for electroweak neutralino and chargino production in channels with Higgs, Z, and W bosons in pp collisions at 8 TeV
No full textSubmitted to Phys. Rev. D - see paper for full list of authorsSearches for supersymmetry (SUSY) are presented based on the electroweak pair production of neutralinos and charginos, leading to decay channels with Higgs, Z, and W bosons and undetected lightest SUSY particles (LSPs). The data sample corresponds to an integrated luminosity of about 19.5 inverse femtobarns of proton-proton collisions at a center-of-mass energy of 8 TeV collected in 2012 with the CMS detector at the LHC. The main emphasis is neutralino pair production in which each neutralino decays either to a Higgs boson (h) and an LSP or to a Z boson and an LSP, leading to hh, hZ, and ZZ states with missing transverse energy (ET(miss)). A second aspect is chargino-neutralino pair production, leading to hW states with ET(miss). The decays of a Higgs boson to a bottom-quark pair, to a photon pair, and to final states with leptons are considered in conjunction with hadronic and leptonic decay modes of the Z and W bosons. No evidence is found for supersymmetric particles, and 95% confidence level upper limits are evaluated for the respective pair production cross sections and for neutralino and chargino mass values
Long time asymptotics for optimal investment
No full textThis survey reviews portfolio selection problem for long-term horizon. We consider two objectives: (i) maximize the probability for outperforming a target growth rate of wealth process (ii) minimize the probability of falling below a target growth rate. We study the asymptotic behavior of these criteria formulated as large deviations control pro\-blems, that we solve by duality method leading to ergodic risk-sensitive portfolio optimization problems. Special emphasis is placed on linear factor models where explicit solutions are obtained
Predicting New Ugi-Smiles Couplings: A Combined Experimental and Theoretical Study
No full textInternational audienceFollowing our previous mechanistic studies of multicomponent Ugi-type reactions, theoretical calculations have been performed to predict the efficiency of new substrates in Ugi-Smiles couplings. First, as predicted, 2,4,6-trichlorophenol experimentally gave the corresponding aryl-imidate. Theoretical predictions of nitrosophenols as good acidic partners were then successfully confirmed by experiments. In the latter case, the reaction offers a new access to benzimidazoles
The force of impacting rain
No full textInternational audienceDrop impacts are difficult to characterize due to their transient, non-stationary nature. We discuss the force generated during such impacts, a key quantity for animals, plants, roofs or soil erosion. Although a millimetric drop has a modest weight, it can generate collision forces on the order of thousand times this weight. We measure and discuss this amplification, considering natural parameters such as drop radius and density, impact speed and response time of the substrate. We finally imagine two kinds of devices allowing us to deduce the size of the raindrop from impact forces
An overview of Viscosity Solutions of Path-Dependent PDEs
No full textThis paper provides an overview of the recently developed notion of viscosity solutions of path-dependent partial di erential equations. We start by a quick review of the Crandall- Ishii notion of viscosity solutions, so as to motivate the relevance of our de nition in the path-dependent case. We focus on the wellposedness theory of such equations. In partic- ular, we provide a simple presentation of the current existence and uniqueness arguments in the semilinear case. We also review the stability property of this notion of solutions, in- cluding the adaptation of the Barles-Souganidis monotonic scheme approximation method. Our results rely crucially on the theory of optimal stopping under nonlinear expectation. In the dominated case, we provide a self-contained presentation of all required results. The fully nonlinear case is more involved and is addressed in [12]
Search for the associated production of the Higgs boson with a top-quark pair
No full textSubmitted to JHEP, see paper for full list of authorsA search for the standard model Higgs boson produced in association with a top-quark pair (ttbar H) is presented, using data samples corresponding to integrated luminosities of up to 5.1 inverse femtobarns and 19.7 inverse femtobarns collected in pp collisions at center-of-mass energies of 7 TeV and 8 TeV respectively. The search is based on the following signatures of the Higgs boson decay: H to hadrons, H to photons, and H to leptons. The results are characterized by an observed ttbar H signal strength relative to the standard model cross section, mu=sigma/sigma[SM], under the assumption that the Higgs boson decays as expected in the standard model. The best fit value is mu=2.8 +/- 1.0 for a Higgs boson mass of 125.6 GeV
