5,617,151 research outputs found

    Ex post information rents and disclosure in sequential screening

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    We study ex post information rents in sequential screening models where the agent receives private ex ante and ex post information. The principal has to pay ex post information rents for preventing the agent to coordinate lies about his ex ante and ex post information. When the agent’s ex ante information is discrete, these rents are positive, whereas they are zero in continuous models. Consequently, full disclosure of ex post information is generally suboptimal. Optimal disclosure rules trade off the benefits from adapting the allocation to better information against the effect that more information aggravates truth-telling

    Tunneling conductance of graphene ferromagnet-insulator-superconductor junctions

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    We study the transport properties of a graphene ferromagnet-insulator superconductor (FIS) junction within the Blonder-Tinkham-Klapwijk formalism by solving spin-polarized Dirac-Bogoliubov-de-Gennes equation. We find that the retro and specular Andreev reflections in the graphene FIS junction are drastically modified in the presence of exchange interaction and that the spin-polarization (PTP_T) of tunneling current can be tuned from the positive to negative value by bias voltage (VV). In the thin-barrier limit, the conductance GG of a graphene FIS junction oscillates as a function of barrier strength χ\chi. Both the amplitude and phase of the conductance oscillation varies with the exchange energy EexE_{ex}. For Eex<EFE_{ex}<E_F (Fermi energy), the amplitude of oscillation decreases with EexE_{ex}. For Eexc>Eex>EFE_{ex}^{c}>E_{ex}>E_F, the amplitude of oscillation increases with EexE_{ex}, where Eexc=2EF+U0E_{ex}^{c}=2E_{F}+U_{0} (U0U_{0} is the applied electrostatic potential on the superconducting segment of the junction). For Eex>EexcE_{ex} > E_{ex}^{c}, the amplitude of oscillation decreases with EexE_{ex} again. Interestingly, a universal phase difference of π/2\pi/2 in χ\chi exists between the GχG-\chi curves for Eex>EFE_{ex}>E_F and Eex<EFE_{ex}<E_F. Finally, we find that the transitions between retro and specular Andreev reflections occur at eV=EFEexeV=|E_{F}-E_{ex}| and eV=Eex+EFeV=E_{ex}+E_{F}, and hence the singular behavior of the conductance near these bias voltages results from the difference in transport properties between specular and retro Andreev reflections.Comment: Accepted for publication in Physical Review

    Tomo lo que encuentro : 19 versiones de Virus

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    “No hay que juzgar a un producto argentino por lo que le falta con respecto a uno americano o europeo... La crítica suele ser más permisiva con las producciones extranjeras que con las locales... No quiero que tengamos una fama tan grande que nos impida la libertad de seguir haciendo lo que querramos”. Tres conceptos de Federico Moura en el último reportaje radial que le hice (y que se le hizo), que bastarían para mostrar a alguien atento a lo que pasaba y que tenía las palabras para dar cuenta de ese registro. Esto está presente en toda la obra de Virus. Una producción que siempre fue creciendo en calidad, en forma y contenido. Este CD es el mejor testimonio de su vigencia. Que tantos solistas y grupos platenses, talentosos y apasionados, hayan tenido deseos de hacer su versión de temas de Virus, es el reconocimiento más pleno de una obra genuina, que despierta amor y respeto. Y claro que Federico está. Si no cómo sabríamos que falta. Tom Lupo Contenido: 1 - Sergio Pángaro: "Tomo lo que encuentro" 2 - Míster América: "Dame una señal" 3 - Ex: "El banquete" 4 - Cine Continuado: "Wadu-wadu" 5 - Ahora: "Sin disfraz" 6 - Las Canoplas: "En mi garage" 7 - Federico Kempff: "Desesperado secuencia uno" 8 - Alfredo Calvelo: "Loco coco" 9 - Traviatabosnialafortina: "Juegos postergados" 10 - Estelares: "Pronta entrega" 11 - Falso Primer Ministro: "Danza narcótica" 12 - NerdKids: "Me puedo programar" 13 - Plupart: "Se sarpo" 14 - Francisco Bochatón: "Imágenes paganas" 15 - El César: "El 146" 16 - Los Hermanitos Kaiser y su Increíble Organito que Toca Solo: "Juegos incompletos" 17 - La Secta: "Mirada speed" 18 - Norma: "Densa realidad" 19 - Juan Pablo Bochatón: "Tomo lo que encuentro"Radio Universidad Nacional de La Plat

    Unwanted pursuit behavior after breakup: occurrence, risk factors, and gender differences

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    This study investigated unwanted pursuit behavior (UPB) perpetration in 631 adult ex-partners. UPB involves the unwanted pursuit of intimacy, a widespread and usually less severe form of stalking. The occurrence and various risk factors of UPB perpetration were examined, accounting for differences between male and female ex-partners and same- and opposite-gender ex-partners. Ex-partners showed on average five to six UPBs after their separation. Male and female and same- and opposite-gender ex-partners displayed an equal number of UPBs. The number of perpetrated UPBs was explained by breakup characteristics (ex-partner initiation of the breakup and rumination or cognitive preoccupation with the ex-partner), relationship characteristics (anxious attachment in the former relationship), and individual perpetrator characteristics (borderline traits and past delinquent behaviors). Rumination was a stronger predictor in female than male ex-partners. Borderline traits and anxious attachment positively predicted UPB perpetration in opposite-gender but not in same-gender ex-partners. Implications of these findings are discussed

    Racial Disparities and Similarities in Post-Release Recidivism and Employment Among Ex-prisoners with a Different Level of Education

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    Previous studies rarely examined racial disparities in post-release employment and recidivism. Finding a job is an immediate challenge to all released ex-prisoners, and often more difficult for African American ex-prisoners who typically return to economically-depressed neighborhoods upon release from prison. The present researchers conducted a 5-year (2005-2009) follow-up study in an attempt to understand racial disparities in post-release employment and recidivism among 6,394 released ex-prisoners (2,531 Caucasian and 3,863 African American), while controlling for the ex-prisoner’s level of education. Results of this study showed that African American ex-prisoners had a higher unemployment rate and recidivism rate than Caucasian ex-prisoners. This study also revealed that released ex-prisoners, if employed, would likely be under-employed and experience difficulties in sustaining employment, regardless of the ex-prisoner’s ethnicity. Most importantly, post-release employment and level of education were the two most influential predictors to recidivism among ex-prisoners, regardless of ethnicity

    ρ(770)0\rho(770)^0, K(892)0^*(892)^0 and f0(980)_{0}(980) Production in Au-Au and pp Collisions at sNN\sqrt{s_{NN}} = 200 GeV

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    Preliminary results on ρ(770)0π+π\rho(770)^0 \to \pi^{+}\pi^{-}, K(892)0π^{*}(892)^{0} \to \piK and f0(980)π+πf_{0}(980) \to \pi^{+}\pi^{-} production using the mixed-event technique are presented. The measurements are performed at mid-rapidity by the STAR detector in sNN\sqrt{s_{NN}}= 200 GeV Au-Au and pp interactions at RHIC. The results are compared to different measurements at various energies.Comment: 4 pages, 6 figures. Talk presented at Quark Matter 2002, Nantes, France, July 18-24, 2002. To appear in the proceedings (Nucl. Phys. A

    Some problems in plasma suppression of beam-beam interactions at muon colliders

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    The idea of plasma suppression of beam-beam effects at muon colliders is discussed. It is shown that one should take into account collisions in the plasma that were ignored before. Rough estimates show that this effect leads to a fast ``recovery'' of the beam magnetic field. For beam parameters characteristic for muon colliders the suppression of the magnetic component of the beam field (1/2 of the total force) is almost absent. It is also shown that the presence of the dense plasma (Li jet) at the interaction point leads to enormous hadronic background (due to photo-nuclear reactions) in the detector, about 10^{7} particles per crossing at large angles which creates serious problems for experimentation.Comment: 6 pages, LaTeX, Talk at the Workshop Studies on Colliders and Collider Physics at the Highest Energies: Muon Colliders at 10 TeV to 100 TeV, 27 September - 1 October, 1999 Montauk, New York, USA, be published by the American Institute of Physic

    The K2K SciBar Detector

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    A new near detector, SciBar, for the K2K long-baseline neutrino oscillation expe riment was installed to improve the measurement of neutrino energy spectrum and to study neutrino interactions in the energy region around 1 GeV. SciBar is a 'fully active' tracking detector with fine segmentation consisting of plastic scintillator bars. The detector was constructed in summer 2003 and is taking data since October 2003. The basic design and initial performance is presented.Comment: 7 pages, 4figures, Contributed to Proceedings of the 10th Vienna Conference on Instrumentation, Vienna, February 16-21, 200
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