2,247 research outputs found
A window to the Galactic X-ray halo: The ISM towards the Lockman hole
We present a combined X-ray/HI-analysis of the ISM towards the Lockman hole.
This sky region is considered as the "window to the distant universe" because
of its absolute lowest HI column density on the whole sky. The Lockman hole
appears to be not as transparent as the HI data suggest. We propose that about
half of the ISM towards the Lockman hole is in form of ionized hydrogen rather
than HI.Comment: Proceedings, International Workshop on X-RAY SURVEYS, in the light of
new observatories Santander (Spain), 4-6 September 2000 (accepted
A First Derivative Potts Model for Segmentation and Denoising Using ILP
Unsupervised image segmentation and denoising are two fundamental tasks in
image processing. Usually, graph based models such as multicut are used for
segmentation and variational models are employed for denoising. Our approach
addresses both problems at the same time. We propose a novel ILP formulation of
the first derivative Potts model with the data term, where binary
variables are introduced to deal with the norm of the regularization
term. The ILP is then solved by a standard off-the-shelf MIP solver. Numerical
experiments are compared with the multicut problem.Comment: 6 pages, 2 figures. To appear at Proceedings of International
Conference on Operations Research 2017, Berli
Programmable digital modem
Information on programmable digital modems (PDM) is given in viewgraph form. Topics covered include data rate range and operational modes, test and demonstration equipment, program goals, modulation formats, and PDM design challenges
Social uncertainty is heterogeneous and sometimes valuable
To win friends, help the needy, avoid exploitation or influence strangers, people must make decisions that are inherently uncertain. In their compelling and insightful perspective on resolving social uncertainty1, FeldmanHall and Shenhav (henceforth F&S) join a growing movement combining computational approaches with social psychological theory. F&S identify a range of negative and positive aspects of social uncertainty. Here we offer additional ways to think about social uncertainty and suggest potential avenues for future research
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The Benefits and Costs of a Rose-Colored Hindsight
Self-serving biases lead people to see themselves and their future through rose-colored glasses. New research by Kouchaki and Gino suggests this rosy view also extends backward: memories of unethical behavior are less vivid than memories of good deeds. This so-called “unethical amnesia” has many individual benefits, but also carries social costs
Exchange and correlation energies of ground states of atoms and molecules in strong magnetic fields
Using a Hartree-Fock mesh method and a configuration interaction approach
based on a generalized Gaussian basis set we investigate the behaviour of the
exchange and correlation energies of small atoms and molecules, namely th e
helium and lithium atom as well as the hydrogen molecule, in the presence of a
magnetic field covering the regime B=0-100a.u. In general the importance of the
exchange energy to the binding properties of at oms or molecules increases
strongly with increasing field strength. This is due to the spin-flip
transitions and in particular due to the contributions of the tightly bound
hydrogenic state s which are involved in the corresponding ground states of
different symmetries. In contrast to the exchange energy the correlation energy
becomes less relevant with increasing field strength. This holds for the
individual configurations constituting the ground state and for the crossovers
of the global ground state.Comment: 4 Figures acc.f.publ.in Phys.Rev.
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