Entropic Upper Bound on Gravitational Binding Energy

We prove that the gravitational binding energy {\Omega} of a self gravitating system described by a mass density distribution {\rho}(x) admits an upper bound B[{\rho}(x)] given by a simple function of an appropriate, non-additive Tsallis' power-law entropic functional Sq evaluated on the density {\rho}. The density distributions that saturate the entropic bound have the form of isotropic q-Gaussian distributions. These maximizer distributions correspond to the Plummer density profile, well known in astrophysics. A heuristic scaling argument is advanced suggesting that the entropic bound B[{\rho}(x)] is unique, in the sense that it is unlikely that exhaustive entropic upper bounds not based on the alluded Sq entropic measure exit. The present findings provide a new link between the physics of self gravitating systems, on the one hand, and the statistical formalism associated with non-additive, power-law entropic measures, on the other hand

Instanton interactions in dense-matter QCD

A Coulomb gas representation of dense-matter QCD is derived from a dual transformation of the low-energy effective Lagrangian. The point-like charges Q=+1,-1 of the gas are identified with the instantons and anti-instantons of such topological charges. An instanton repels another instanton with the same force as it attracts an anti-instanton, in contrast to the semiclassical interaction.Comment: 8 pages, Revtex (a typo fixed

Screening of qubit from zero-temperature reservoir

We suggest an application of dynamical Zeno effect to isolate a qubit in the quantum memory unit against decoherence caused by coupling with the reservoir having zero temperature. The method is based on using an auxiliary casing system that mediate the qubit-reservoir interaction and is simultaneously frequently erased to ground state. This screening procedure can be implemented in the cavity QED experiments to store the atomic and photonic qubit states.Comment: 4 pages, 5 figure

Impact of the first wave of the COVID-19 outbreak on mental health and psychiatric drug use among portuguese pharmacy professionals

The COVID-19 outbreak was considered a pandemic by the World Health Organization on March 11, 2020 [1]. This outbreak has raised public health problems, bringing with it several implications both on physical and psychological level, in particular for health professionals on the front line of the pandemic, for the greater risk of infection [2,3]. In this sense, it is pertinent to evaluate how the COVID-19 outbreak had implications on the mental health and in the consumption of psychotropic drugs in Portugal, and among pharmacy professionals.info:eu-repo/semantics/publishedVersio

Levantamento fitossociológico de plantas daninhas em cafezal orgânico.

A adequação de um cafezal para o sistema orgânico causa grande mudança no sistema de manejo de plantas daninhas, mas as informações sobre o comportamento da comunidade infestante em áreas de cultivo de café orgânico são escassas no Brasil. Objetivou-se com este trabalho realizar um levantamento fitossociológico da comunidade infestante em três cafezais (variedades Mundo Novo, Bourbon Vermelho e Obatã) desenvolvidos em sistema orgânico, no município de Garça (SP). Nas três áreas estudadas foram arremessados ao acaso cem quadrados metálicos com área vazada de 0,25 m2, nas entrelinhas da cultura. As espécies contidas no interior dos quadros foram identificadas segundo a espécie botânica, nome popular e família. A partir dos resultados, determinaram-se os parâmetros fitossociológicos: frequência, densidade, abundância, frequência relativa, densidade relativa, abundância relativa, índice de valor de importância e similaridade florísticas pelos métodos de Simple Matching de Sneath & Sokal e similaridade de Sorensen. As famílias que mais se destacaram, com maior número de espécies nas três áreas foram Poaceae e Asteraceae. Houve alta similaridade em todos os contrastes testados, já que pelo menos metade das espécies identificadas foi comum às duas áreas contrastadas

Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in √s = 7 TeV pp collisions with the ATLAS detector

A search for the direct production of charginos and neutralinos in final states with three electrons or muons and missing transverse momentum is presented. The analysis is based on 4.7 fb−1 of proton–proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in three signal regions that are either depleted or enriched in Z-boson decays. Upper limits at 95% confidence level are set in R-parity conserving phenomenological minimal supersymmetric models and in simplified models, significantly extending previous results

An Integrated TCGA Pan-Cancer Clinical Data Resource to Drive High-Quality Survival Outcome Analytics

For a decade, The Cancer Genome Atlas (TCGA) program collected clinicopathologic annotation data along with multi-platform molecular profiles of more than 11,000 human tumors across 33 different cancer types. TCGA clinical data contain key features representing the democratized nature of the data collection process. To ensure proper use of this large clinical dataset associated with genomic features, we developed a standardized dataset named the TCGA Pan-Cancer Clinical Data Resource (TCGA-CDR), which includes four major clinical outcome endpoints. In addition to detailing major challenges and statistical limitations encountered during the effort of integrating the acquired clinical data, we present a summary that includes endpoint usage recommendations for each cancer type. These TCGA-CDR findings appear to be consistent with cancer genomics studies independent of the TCGA effort and provide opportunities for investigating cancer biology using clinical correlates at an unprecedented scale. Analysis of clinicopathologic annotations for over 11,000 cancer patients in the TCGA program leads to the generation of TCGA Clinical Data Resource, which provides recommendations of clinical outcome endpoint usage for 33 cancer types

Emergence of quasi-metallic state in disordered 2D electron gas due to strong interactions

The interrelation between disorder and interactions in two dimensional electron liquid is studied beyond weak coupling perturbation theory. Strong repulsion significantly reduces the electronic density of states on the Fermi level. This makes the electron liquid more rigid and strongly suppresses elastic scattering off impurities. As a result the weak localization, although ultimately present at zero temperature and infinite sample size, is unobservable at experimentally accessible temperature at high enough densities. Therefore practically there exists a well defined metallic state. We study diffusion of electrons in this state and find that the diffusion pole is significantly modified due to "mixture" with static photons similar to the Anderson - Higgs mechanism in superconductivity. As a result several effects stemming from the long range nature of diffusion like the Aronov - Altshuler logarithmic corrections to conductivity are less pronounced.Comment: to appear in Phys. Rev.

Measurement of D*+/- meson production in jets from pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

This paper reports a measurement of D*+/- meson production in jets from proton-proton collisions at a center-of-mass energy of sqrt(s) = 7 TeV at the CERN Large Hadron Collider. The measurement is based on a data sample recorded with the ATLAS detector with an integrated luminosity of 0.30 pb^-1 for jets with transverse momentum between 25 and 70 GeV in the pseudorapidity range |eta| < 2.5. D*+/- mesons found in jets are fully reconstructed in the decay chain: D*+ -> D0pi+, D0 -> K-pi+, and its charge conjugate. The production rate is found to be N(D*+/-)/N(jet) = 0.025 +/- 0.001(stat.) +/- 0.004(syst.) for D*+/- mesons that carry a fraction z of the jet momentum in the range 0.3 < z < 1. Monte Carlo predictions fail to describe the data at small values of z, and this is most marked at low jet transverse momentum.Comment: 10 pages plus author list (22 pages total), 5 figures, 1 table, matches published version in Physical Review

Ciências sociais e ambientais rural: principais temas e perspectivas analíticas.

Este trabalho tem por finalidade fazer um balanço dos estudos ambientais rurais sob a perspectiva das ciências sociais. Para isso, em primeiro lugar, realiza-se uma análise da trajetória dos movimentos sociais, identificando-se as principais questões ambientais emergentes na ótica dos atores do mundo rural. Num segundo momento, agrupam-se os temas privilegiados pelos pesquisadores para, em seguida, apontar as principais perspectivas analíticas em curso