1,183 research outputs found
Foreword: After Guantanamo
“Guantanamo Bay.” To many around the world those two words conjure up haunting images of orange jumpsuit-clad detainees imprisoned behind barbed-wire fences, subjected to the cruelest imaginable interrogation techniques, and held indefinitely without trial, or awaiting trial before military commissions whose procedures violate international law. It is no surprise, then, that the new U.S. administration perceived the Guantanamo Bay detention center and associated detainee policies as an indelible stain on America\u27s moral authority and an impediment to the success of future U.S. foreign policy
Forward: After Guantanamo
“Guantanamo Bay.” To many around the world those two words conjure up haunting images of orange jumpsuit-clad detainees imprisoned behind barbed-wire fences, subjected to the cruelest imaginable interrogation techniques, and held indefinitely without trial, or awaiting trial before military commissions whose procedures violate international law. It is no surprise, then, that the new U.S. administration perceived the Guantanamo Bay detention center and associated detainee policies as an indelible stain on America\u27s moral authority and an impediment to the success of future U.S. foreign policy
Improvement of Impaired Memory in Mice by Taurine
Taurine was extracted from Pegasus later-narius Cuvier
to study its effects on learning and
memory in mice. Mice were treated with different
doses of taurine (10 mg/kg, 20 mg/kg, 40 mg/kg).
The mice were treated with various chemical
agents (pentobarbital, cycloheximide, sodium
nitrite, alcohol) to disrupt the normal memory
process. We measured the effect of taurine on
step-down latency (SDL) and escape latency (EL)
in a passive avoidance task after 10 or 30 days.
Treatment with taurine alone did not change
either SDL or EL. Taurine protected mice .from
the memory disruption induced by alcohol,
pentobarbital, sodium nitrite, and cycloheximide
but had no obvious effect on motor coordination,
exploratory activity, or locomotor activity as
measured using the rota-rod test and the hole
board test. We conclude that taurine can be
effective in attenuating the amnesia produced
by alcohol, pentobarbital, cycloheximide, and
sodium nitrite without compromising the
behavioral aspects of the animals tested
Calibrated Learning and Correlated Equilibrium
Suppose two players repeatedly meet each other to play a game where:
1. each uses a learning rule with the property that it is a calibrated forecast of the other\u27s plays, and
2. each plays a myopic best response to this forecast distribution.
Then, the limit points of the sequence of plays are correlated equilibria. In fact, for each correlated equilibrium there is some calibrated learning rule that the players can use which results in their playing this correlated equilibrium in the limit. Thus, the statistical concept of a calibration is strongly related to the game theoretic concept of correlated equilibrium
The suppression of magnetism and the development of superconductivity within the collapsed tetragonal phase of Ca0.67Sr0.33Fe2As2 at high pressure
Structural and electronic characterization of (Ca0.67Sr0.33)Fe2As2 has been
performed as a func- tion of pressure up to 12 GPa using conventional and
designer diamond anvil cells. The compound (Ca0.67Sr0.33)Fe2As2 behaves
intermediate between its end members-CaFe2As2 and SrFe2As2- displaying a
suppression of magnetism and the onset of superconductivity. Like other members
of the AEFe2As2 family, (Ca0.67Sr0.33)Fe2As2 undergoes a pressure-induced
isostructural volume collapse, which we associate with the development of As-As
bonding across the mirror plane of the structure. This collapsed tetragonal
phase abruptly cuts off the magnetic state, giving rise to superconductivity
with a maximum Tc=22.2 K. The maximum Tc of the superconducting phase is not
strongly correlated with any structural parameter, but its proximity to the
abrupt suppression of magnetism as well as the volume collapse transition
suggests that magnetic interactions and structural inhomogeneity may play a
role in its development. The pressure-dependent evolution of the ordered states
and crystal structures in (Ca,Sr)Fe2As2 provides an avenue to understand the
generic behavior of the other members of the AEFe2As2 family.Comment: 9 pages, 9 figure
Transferable Utility Games with Uncertainty
We introduce the concept of a TUU-game, a transferable utility game with uncertainty. In a TUU-game there is uncertainty regarding the payoffs of coalitions. One out of a finite number of states of nature materializes and conditional on the state, the players are involved in a particular transferable utility game. We consider the case without ex ante commitment possibilities and propose the Weak Sequential Core as a solution concept. We characterize the Weak Sequential Core and show that it is non-empty if all ex post TUgames are convex
Guidance Systems of Fighter Aircraft
Mission performance of a fighter aircraft is crucial for survival and strike capabilities in todays' aerial warfare scenario. The guidance functions of such an aircraft play a vital role inmeeting the requirements and accomplishing the mission success. This paper presents the requirements of precision guidance for various missions of a fighter aircraft. The concept ofguidance system as a pilot-in-loop system is pivotal in understanding and designing such a system. Methodologies of designing such a system are described
Self-Propagating Reactive Fronts in Compacts of Multilayered Particles
Reactive multilayered foils in the form of thin films have gained interest in various applications such as joining, welding, and ignition. Typically, thin film multilayers support self-propagating reaction fronts with speeds ranging from 1 to 20 m/s. In some applications, however, reaction fronts with much smaller velocities are required. This recently motivated Fritz et al. (2011) to fabricate compacts of regular sized/shaped multilayered particles and demonstrate self-sustained reaction fronts having much smaller velocities than thin films with similar layering. In this work, we develop a simplified numerical model to simulate the self-propagation of reactive fronts in an idealized compact, comprising identical Ni/Al multilayered particles in thermal contact. The evolution of the reaction in the compact is simulated using a two-dimensional transient model, based on a reduced description of mixing, heat release, and thermal transport. Computed results reveal that an advancing reaction front can be substantially delayed as it crosses from one particle to a neighboring particle, which results in a reduced mean propagation velocity. A quantitative analysis is thus conducted on the dependence of these phenomena on the contact area between the particles, the thermal contact resistance, and the arrangement of the multilayered particles
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