14,108 research outputs found
Weighted Average Lexicographic Values for Share Sets and Balanced Cooperative Games
Inspired by Kalai-Samet [4] and Tijs [11], weighted average lexicographic values are introduced for share sets and for cores of cooperative games using induction arguments. Continuity properties and monotonicity properties of these weighted lexicographic values are studied. For subclasses of games (convex games, simplex games, big boss games) relations are established with weighted (exact) Shapley values.Cooperative games;average lexicographic value;weighted Shapley value
Entanglement for all quantum states
It is shown that a state that is factorizable in the Hilbert space
corresponding to some choice of degrees of freedom, becomes entangled for a
different choice of degrees of freedom. Therefore, entanglement is not a
special case but is ubiquitous in quantum systems. Simple examples are
calculated and a general proof is provided. The physical relevance of the
change of tensor product structure is mentioned.Comment: 9 page
Share Opportunity Sets and Cooperative Games
In many share problems there is a priori given a natural set of possible divisions to solve the sharing problem.Cooperative games related to such share sets are introduced, which may be helpful in solving share problems.Relations between properties of share sets and properties of games are investigated.The average lexicographic value for share sets and for cooperative games is studied.cooperative games;bankruptcy games;average lexicographic value;opportunity sets
Agricultura de precisão: fundamentos, aplicações e perspectivas para a cultura do arroz.
O uso da agricultura de precisão vem se tornando cada vez mais frequente nos países em desenvolvimento e desenvolvidos onde, como nos Estados Unidos e Japão, os governos vêm enfatizando a pesquisa e o desenvolvimento nesta área como uma estratégia nacional (NRC, 1997; Japanese Government, 1998).bitstream/CNPDIA/9498/1/CT30_99.pd
Uso de microcontroladores e realidade virtual na agricultura.
bitstream/CNPDIA/10059/1/CT22_97.pd
EPR before EPR: a 1930 Einstein-Bohr thought experiment revisited
In 1930 Einstein argued against consistency of the time-energy uncertainty
relation by discussing a thought experiment involving a measurement of mass of
the box which emitted a photon. Bohr seemingly triumphed over Einstein by
arguing that the Einstein's own general theory of relativity saves the
consistency of quantum mechanics. We revisit this thought experiment from a
modern point of view at a level suitable for undergraduate readership and find
that neither Einstein nor Bohr was right. Instead, this thought experiment
should be thought of as an early example of a system demonstrating nonlocal
"EPR" quantum correlations, five years before the famous
Einstein-Podolsky-Rosen paper.Comment: 11 pages, revised, accepted for publication in Eur. J. Phy
Jackknife resampling technique on mocks: an alternative method for covariance matrix estimation
We present a fast and robust alternative method to compute covariance matrix
in case of cosmology studies. Our method is based on the jackknife resampling
applied on simulation mock catalogues. Using a set of 600 BOSS DR11 mock
catalogues as a reference, we find that the jackknife technique gives a similar
galaxy clustering covariance matrix estimate by requiring a smaller number of
mocks. A comparison of convergence rates show that 7 times fewer
simulations are needed to get a similar accuracy on variance. We expect this
technique to be applied in any analysis where the number of available N-body
simulations is low.Comment: 11 pages, 11 figures, 2 table
Geração de mapas georreferenciados para visualização de dados de campo para auxílio na tomada de decisão em irrigação de precisão.
Este trabalho teve como objetivo desenvolver um aplicativo computacional capaz de gerar mapas georreferenciados úteis para a tomada de decisão em irrigação de precisão. Para tanto, foram utilizadas as bibliotecas TerraLib e SOMCode, ambas de código aberto e escritas na linguagem C++, desenvolvidas pelo Instituto Nacional de Pesquisas Espaciais (INPE) e pela Embrapa Tabuleiros Costeiros (CPATC), respectivamente. Os dados utilizados para a geração desses mapas foram obtidos por uma grade de sensores de uma unidade piloto da plataforma Irrigap, desenvolvida pela Embrapa Instrumentação Agropecuária (CNPDIA), dados esses referentes a medidas horárias de umidade e temperatura do solo e temperatura do ar. Diferentes métodos de interpolação foram utilizados, com o intuito de verificar qual a melhor maneira de se gerar mapas que possibilitem a visualização de áreas com o mesmo comportamento com relação às variáveis de solo e climatológicas, as chamadas zonas de manejo agrícolas. Os resultados obtidos mostraram que é possível a identificação dessas zonas, desde que sejam utilizados os algoritmos corretos para cada situação. Além disso, aplicativos para a geração de mapas temáticos utilizando dados reais podem se tornar importantes para a tomada de decisão em agricultura de precisão, proporcionando benefícios como a economia de água e energia durante o período de irrigação
Slow dynamics in a turbulent von K\'arm\'an swirling flow
We present an experimental study of a turbulent von K\'arm\'an flow produced
in a cylindrical container using two propellers. The mean flow is stationary up
to , where a bifurcation takes place. The new regime breaks some
symmetries of the problem, and is time-dependent. The axisymmetry is broken by
the presence of equatorial vortices with a precession movement, being the
velocity of the vortices proportional to the Reynolds number. The reflection
symmetry through the equatorial plane is broken, and the shear layer of the
mean flow appears displaced from the equator. These two facts appear
simultaneously. In the exact counterrotating case, a bistable regime appears
between both mirrored solutions and spontaneous reversals of the azimuthal
velocity are registered. This evolution can be explained using a three-well
potential model with additive noise. A regime of forced periodic response is
observed when a very weak input signal is applied.Comment: Improved model, additional results and figures, accepted in PR
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