927 resultados para timing constraint
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We present a long-term phase-coherent timing analysis and pulse-phase resolved spectroscopy for the two outbursts observed from the transient anomalous X-ray pulsar CXOU J164710.2−455216. For the first outburst we used 11 Chandra and XMM–Newton observations between 2006 September and 2009 August, the longest baseline yet for this source. We obtain a coherent timing solution with P = 10.61065583(4) s, Ṗ = 9.72(1) × 10−13 s s−1 and P̈ = –1.05(5) × 10−20 s s−2. Under the standard assumptions this implies a surface dipolar magnetic field of ∼1014 G, confirming this source as a standard B magnetar. We also study the evolution of the pulse profile (shape, intensity and pulsed fraction) as a function of time and energy. Using the phase-coherent timing solution we perform a phase-resolved spectroscopy analysis, following the spectral evolution of pulse-phase features, which hints at the physical processes taking place on the star. The results are discussed from the perspective of magnetothermal evolution models and the untwisting magnetosphere model. Finally, we present similar analysis for the second, less intense, 2011 outburst. For the timing analysis we used Swift data together with 2 XMM–Newton and Chandra pointings. The results inferred for both outbursts are compared and briefly discussed in a more general framework.
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The multiobjective optimization model studied in this paper deals with simultaneous minimization of finitely many linear functions subject to an arbitrary number of uncertain linear constraints. We first provide a radius of robust feasibility guaranteeing the feasibility of the robust counterpart under affine data parametrization. We then establish dual characterizations of robust solutions of our model that are immunized against data uncertainty by way of characterizing corresponding solutions of robust counterpart of the model. Consequently, we present robust duality theorems relating the value of the robust model with the corresponding value of its dual problem.
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Plane model extraction from three-dimensional point clouds is a necessary step in many different applications such as planar object reconstruction, indoor mapping and indoor localization. Different RANdom SAmple Consensus (RANSAC)-based methods have been proposed for this purpose in recent years. In this study, we propose a novel method-based on RANSAC called Multiplane Model Estimation, which can estimate multiple plane models simultaneously from a noisy point cloud using the knowledge extracted from a scene (or an object) in order to reconstruct it accurately. This method comprises two steps: first, it clusters the data into planar faces that preserve some constraints defined by knowledge related to the object (e.g., the angles between faces); and second, the models of the planes are estimated based on these data using a novel multi-constraint RANSAC. We performed experiments in the clustering and RANSAC stages, which showed that the proposed method performed better than state-of-the-art methods.
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Convex vector (or multi-objective) semi-infinite optimization deals with the simultaneous minimization of finitely many convex scalar functions subject to infinitely many convex constraints. This paper provides characterizations of the weakly efficient, efficient and properly efficient points in terms of cones involving the data and Karush–Kuhn–Tucker conditions. The latter characterizations rely on different local and global constraint qualifications. The results in this paper generalize those obtained by the same authors on linear vector semi-infinite optimization problems.
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Although views differ on the precise contents and timing of a genuine banking union, there is wide political agreement in principle on the need for three basic and vital elements: European bank supervision, a European deposit guarantee scheme (DGS) and a European bank resolution mechanism. In this CEPS Essay, H. Onno Ruding offers his personal views on the progress achieved to date, the outstanding issues that will prove the most difficult to resolve and recommendations on the way forward.
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Regulators and competition authorities often prevent firms with significant market power or dominant firms from practicing price discrimination. The goal of such an asymmetric no- discrimination constraint is to encourage entry and serve consumers’ interests. This constraint prohibits the firm with significant market power to practice both behaviour-based price discrimination within the competitive segment and third-degree price discrimination across the monopolistic and competitive segments. We find that this constraint hinders entry and reduces welfare when the monopolistic segment is small.
Germany and the Eurocrisis: The timing of politics and the politics of timing. ACES Cases No. 2014.3
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This paper speculates on the future of the euro. It uses Germany as a prism for the discussion about what might be done next to bolster the Euro. Researching the future—always a challenging task—is made harder when multiple state actors contend for prominence on the basis of shifting coalitions at home, all while interacting at an international level. That said, almost everyone accepts that German choices will play the central role in the path ultimately chosen. This paper thus foregrounds Germany’s role in shaping the way ahead, and it does so through an explicitly political framework focused primarily on the electoral implausibility of an alternative German policy course.
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The European Union (EU) and Mercosur talks have been stalled since discussions were resumed in 2000. Recurring protectionist and institutional obstacles have slowed down negotiations. The financial crisis, however, has resulted in low domestic demand in the EU. This has made the interregional association agreement (IAA) with Mercosur more attractive. The loss of the Generalized Scheme of Preference (GSP) status and the lack of a Free Trade Agreement (FTA) with the EU have both disadvantaged Mercosur. A further window of opportunity is opening up in Mercosur. In Brazil, there have been cries for a change in government. In Argentina, presidential elections will take place in October 2015 and will assuredly bring an end to Kirchnerismo. A change in leadership in both countries is expected to make agreement more likely. Protectionist policies are not expected to remain as high if there is change in government. This will provide the EU with an opportunity to advance the negotiations and conclude the IAA.
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Mode of access: Internet.
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Mode of access: Internet.
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Prepared for U.S. Atomic Energy Commission.
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"Issued: November 23, 1962"--Cover ; "August 1962"--Title page.
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"Nuclear explosions - peaceful applications."