26,658 research outputs found

    The State of Asylum Representation: Ideas for Change

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    The plight of refugees-those who flee persecution-touches a chord with Americans, who have supported both a substantial overseas resettlement program and a fair system for asylum seekers. U.S. laws provide a seemingly full opportunity for asylum applicants to explain their fear or actual experience of persecution. In fact, the U.S. offers an extensive process of interviews, hearings, and appeals to ensure that bona fide refugees are not sent back to their persecutors. The substantive law, too, has been developed considerably through administrative and judicial precedents. But how meaningful is a process that, no matter how extensive and developed, leaves asylum seekers on their own to present their claims when only experts understand how the process works and what the case law means? Asylum applicants often have escaped life threatening situations in their home countries and have overcome financial and physical obstacles to reach the United States, only to be faced with a daunting and confusing asylum application process. Legal assistance is permitted, but it must be at no expense to the government. While some asylum seekers find competent representation, many do not. Most of the key players in the U.S. asylum process-the representatives, the Immigration and Naturalization Service ( INS ) trial attorneys, the Asylum Officers and the Immigration Judges– believe that representation makes a difference for those seeking relief and for the effectiveness of the system. Immigration Court data indicates that represented asylum cases are four to six times more likely to succeed than pro se ones. The time has come to develop ways for all asylum seekers to have the type of legal assistance needed to more fully ensure that bona fide refugees receive the protection that the U.S. public wants to give them and that our laws require. Despite the importance of legal representation, there has yet to be a systematic evaluation of the effectiveness of the current delivery mechanisms in place to aid those in need of legal services and the effect of representation on the asylum system in general. This paper examines the state of affairs with regard to asylum representation and attempts to understand better the barriers to representation. It also begins to assess the effects of representation on asylum seekers and the asylum system itself, and to analyze the various ways in which the representation system can be improved

    Solar-Terrestrial Simulations of CMEs with a Realistic Initiation Mechanism: Case Study for Active Region 10069

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    Most simulations of coronal mass ejections (CMEs) to date either focus on the interplanetary propagation of a giant plasma "blob" without paying too much attention to its origin and to the formation process or they focus on the complex evolution of the coronal magnetic field due to (sub-)photospheric motions which result in an eruption. Here, we present global simulations of CMEs where coronal motions are used to produce a realistic evolution of the coronal magnetic field and cause an eruption. We focus on active region 10069, which produced a number of eruptions in late August 2002, including the August 24, 2002 CME - a fast (~2000 km/s) eruption originating from W81-, as well as a slower eruption on August 22, 2002 (originating from W62). Using a three-dimensional magneto-hydrodynamic (MHD) simulation of these ejections with the Space Weather Modeling Framework (SWMF), we show how a realistic initiation mechanism enables us to study the deflection of the CME in the corona and in the heliosphere. Reconnection of the erupting magnetic field with that of neighboring streamers and active regions modify the solar connectivity of the field lines connecting to Earth and change the expected solar energetic particle fluxes. Comparing the results at 1 AU of our simulations with in situ observations by the ACE spacecraft, we propose an alternate solar origin for the shock wave observed at L1 on August 26.Comment: 4 pages, 2 figures, refereed proceedings for Solar Wind 1

    Comparing resolved-sideband cooling and measurement-based feedback cooling on an equal footing: analytical results in the regime of ground-state cooling

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    We show that in the regime of ground-state cooling, simple expressions can be derived for the performance of resolved-sideband cooling --- an example of coherent feedback control --- and optimal linear measurement-based feedback cooling for a harmonic oscillator. These results are valid to leading order in the small parameters that define this regime. They provide insight into the origins of the limitations of coherent and measurement-based feedback for linear systems, and the relationship between them. These limitations are not fundamental bounds imposed by quantum mechanics, but are due to the fact that both cooling methods are restricted to use only a linear interaction with the resonator. We compare the performance of the two methods on an equal footing --- that is, for the same interaction strength --- and confirm that coherent feedback is able to make much better use of the linear interaction than measurement-based feedback. We find that this performance gap is caused not by the back-action noise of the measurement but by the projection noise. We also obtain simple expressions for the maximal cooling that can be obtained by both methods in this regime, optimized over the interaction strength.Comment: 14 pages, 2 png figures; v2: revised for publicatio

    Interaction of vortices in superconductors with kappa close to 2^(-1/2)

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    Using a perturbative approach to the infinitely degenerate Bogomolnyi vortex state for a superconductor with kappa = 2^(-1/2), T -> T_c, we calculate the interaction of vortices in a superconductor with kappa close to 2^(-1/2). We find, numerically and analytically, that depending on the material the interaction potential between the vortices varies with decreasing kappa from purely repulsive (as in a type-II superconductor) to purely attractive (as in a type-I superconductor) in two different ways: either vortices form a bound state and the distance between them changes gradually from infinity to zero, or this transition occurs in a discontinuous way as a result of a competition between minima at infinity and zero. We study the discontinuous transition between the vortex and Meissner states caused by the non-monotonous vortex interaction and calculate the corresponding magnetization jump.Comment: v1:original submit v2:changed formate of images (gave problems to some) v3:corrected fig v4v6 (was -v4v6) orthographic corrections (and U_lat/int) mismatch v4:more small orthographic corrections v5:converted to revtex4 and bibTex v6:Renamed images to submit to pr
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