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Search Results: 1 - 10 of 136942 matches for " T Alexander Aleinikoff "
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T Alexander Aleinikoff
Forced Migration Review , 2011,
Abstract: Superficially at least, today’s refugee camps do not appear significantly different from those that existed 30 or 40 yearsago. But upon a closer look, it becomes apparent that thingsare changing…
Alexander T
Indian Journal of Ophthalmology , 1987,
Stellar dynamics and tidal disruption events in galactic nuclei
Alexander T.
EPJ Web of Conferences , 2012, DOI: 10.1051/epjconf/20123905001
Abstract: The disruption of a star by the tidal field of a massive black hole is the final outcome of a chain of complex dynamical processes in the host galaxy. I introduce the “loss cone problem”, and describe the many theoretical and numerical challenges on the path of solving it. I review various dynamical channels by which stars can be supplied to a massive black hole, and the relevant dynamical relaxation/randomization mechanisms. I briefly mention some “exotic” tidal disruption scenarios, and conclude by discussing new dynamical results that are changing our understanding of dynamics near a massive black hole, and may well be relevant for tidal disruption dynamics.
On The Hardening of The Spectrum of High-Energy Particles Formed in Heavy-Ion Collisions Considered within The Framework of The Hydrodynamic Approach  [PDF]
Alexander T. D’ yachenko, Konstantin A. Gridnev
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.21003
Abstract: The emission of high-energy particles in 16O + 197Au collisions at energy 20 MeV / nucleon is considered within the framework of the time evolution of a hot spot taking into account the hydrodynamic compression and expansion stages. In addition, the evaporation of the particles that are formed in the early (hot) stage of the evolution of the hot spot is included in the calculation of the spectrum. This leads to a hardening of the particle spectrum in its high-energy part, which is in agreement with experimental data.
Acute haemorrhagic conjunctivitis-rare ocular manifestations
Alexander T,Thomas Anna
Indian Journal of Ophthalmology , 1981,
Congenital glaucoma with neovascularisation of iris managed by a new silicone drainage implant
Alexander T,Thomas Ravi
Indian Journal of Ophthalmology , 1985,
The biomorphological keys of age stages of Tofieldia calyculata (L.) Wahlenb. (Melanthiaceae)
Alexander T. Kuzyarin
Modern Phytomorphology , 2012,
Abstract: The biomorphology keys for identification of eleven age stages of Tofieldia calyculata (L.) Wahlenb. were elaborated. The relative age of the specimens has been established
Microscopic theory of the Andreev gap
T. Micklitz,Alexander Altland
Physics , 2009, DOI: 10.1103/PhysRevLett.103.080403
Abstract: We present a microscopic theory of the Andreev gap, i.e. the phenomenon that the density of states (DoS) of normal chaotic cavities attached to superconductors displays a hard gap centered around the Fermi energy. Our approach is based on a solution of the quantum Eilenberger equation in the regime $t_D\ll t_E$, where $t_D$ and $t_E$ are the classical dwell time and Ehrenfest-time, respectively. We show how quantum fluctuations eradicate the DoS at low energies and compute the profile of the gap to leading order in the parameter $t_D/t_E$ .
A Simple Bayesian Method for Improved Analysis of Quasi-2D Scattering Data
Alexander T. Holmes
Physics , 2014, DOI: 10.1103/PhysRevB.90.024514
Abstract: A new method is presented for the analysis of small angle neutron scattering data from quasi-2D systems such as flux lattices, Skyrmion lattices, and aligned liquid crystals. A significant increase in signal to noise ratio, and a natural application of the Lorentz factor can be achieved by taking advantage of the knowledge that all relevant scattering is centered on a plane in reciprocal space. The Bayesian form ensures that missing information is treated in a controlled way and can be subsequently included in the analysis. A simple algorithm based on Gaussian probability assumptions is provided which provides very satisfactory results. Finally, it is argued that a generalised model-independent Bayesian data analysis method would be highly advantageous for the processing of neutron and x-ray scattering data.
Accuracy Bounds for Belief Propagation
Alexander T. Ihler
Computer Science , 2012,
Abstract: The belief propagation (BP) algorithm is widely applied to perform approximate inference on arbitrary graphical models, in part due to its excellent empirical properties and performance. However, little is known theoretically about when this algorithm will perform well. Using recent analysis of convergence and stability properties in BP and new results on approximations in binary systems, we derive a bound on the error in BP's estimates for pairwise Markov random fields over discrete valued random variables. Our bound is relatively simple to compute, and compares favorably with a previous method of bounding the accuracy of BP.
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