Wavelet-based Faraday Rotation Measure Synthesis

Faraday Rotation Measure (RM) Synthesis, as a method for analyzing multi-channel observations of polarized radio emission to investigate galactic magnetic fields structures, requires the definition of complex polarized intensity in the range of the negative lambda square. We introduce a simple method for continuation of the observed complex polarized intensity into this domain using symmetry arguments. The method is suggested in context of magnetic field recognition in galactic disks where the magnetic field is supposed to have a maximum in the equatorial plane. The method is quite simple when applied to a single Faraday-rotating structure on the line of sight. Recognition of several structures on the same line of sight requires a more sophisticated technique. We also introduce a wavelet-based algorithm which allows us to consider a set of isolated structures. The method essentially improves the possibilities for reconstruction of complicated Faraday structures using the capabilities of modern radio telescopes.Comment: 5 pages, 5 figures, accepted for publication in MNRAS Letter

First measurement of the spectral function at high energy and momentum in medium-heavy nuclei

The experiment E97-006 was performed at Jefferson Lab to measure the momentum and energy distribution of protons in the nucleus far from the region of the (approximate) validity of the mean field description, i.e. at high momentum and energies. The occurrence of this strength is long known from occupation numbers less than one. In the experiment reported here this strength was directly measured for the first time. The results are compared to modern many-body theories. Further the transparency factor of C12 was determined in the Q^2-region of 0.6 to 1.8 (GeV/c)^2.Comment: Proceeding for Fourth International Workshop on Neutrino-Nucleus Interactions in the Few-GeV Region 26.-29. Sept. 2005, Okayam

Chiral phase transition in a lattice fermion--gauge--scalar model with U(1) gauge symmetry

The chiral phase transition induced by a charged scalar field is investigated numerically in a lattice fermion-gauge-scalar model with U(1) gauge symmetry, proposed recently as a model for dynamical fermion mass generation. For very strong gauge coupling the transition is of second order and its scaling properties are very similar to those of the Nambu--Jona-Lasinio model. However, in the vicinity of the tricritical point at somewhat weaker coupling, where the transition changes the order, the scaling behavior is different. Therefore it is worthwhile to investigate the continuum limit of the model at this point.Comment: 20 pages, latex2e, 15 PostScript figures included, all files tared, compressed and uudecode

Faraday caustics: Singularities in the Faraday spectrum and their utility as probes of magnetic field properties

We describe singularities in the distribution of polarized intensity as a function of Faraday depth (i.e. the Faraday spectrum) caused by line-of-sight (LOS) magnetic field reversals. We call these features Faraday caustics because of their similarity to optical caustics. They appear as sharply peaked and asymmetric profiles in the Faraday spectrum, that have a tail that extends to one side. The direction in which the tail extends depends on the way in which the LOS magnetic field reversal occurs (either changing from oncoming to retreating or vice versa). We describe how Faraday caustics will form three-dimensional surfaces that relate to boundaries between regions where the LOS magnetic field has opposite polarity. We present examples from simulations of the predicted polarized synchrotron emission from the Milky Way. We derive either the probability or luminosity distribution of Faraday caustics produced in a Gaussian magnetic field distribution as a function of their strength, F, and find that for strong Faraday caustics P(F)\proptoF^{-3} . If fully resolved, this distribution is also shown to depend on the Taylor microscale, which relates to the largest scale over which dissipation is important in a turbulent flow.Comment: 14 pages, 9 figures, Accepted for publication in Astronomy & Astrophysic

Ensino escolar da geopolítica e sua importância na alfabetização geográfica

Anais do II Seminário Seminário Estadual PIBID do Paraná: tecendo saberes / organizado por Dulcyene Maria Ribeiro e Catarina Costa Fernandes — Foz do Iguaçu: Unioeste; Unila, 2014Quando se propõe uma discussão teórico-metodológica do ensino da Geografia, diretamente deve-se ligá-la a prática docente hoje exercida na escola sobre a perspectiva dessa disciplina. Essa prática docente, juntamente com o corpo pedagógico, é responsável desde as séries iniciais pela alfabetização geográfica que se é construída na medida em que o entendimento e os conceitos da disciplina são exercitados ao longo dos anos. Este artigo propõe uma reflexão sobre o papel e os objetivos da geografia na escola, tendo como principal objetivo a discussão acerca do ensino da geografia escolar, e principalmente da importância geopolítica na elucidação dos demais conhecimentos geográficos. Como início de trabalho, foi utilizada a aplicação de uma atividade a alunos do 2o ano do ensino médio sobre o tema “Guerra Fria”, pela qual se tirou algumas conclusões e considerações de estud

Gestión y Desarrollo de Empresas Innovadoras

The New Technology-Based Firms (NTBFs) represent, for its flexibility and organizational and business capacity, a source of innovation that leverages the local development potentials in which they are found. However, the difficulties such enterprises have to confront if they want to be inserted in a competitive market can become barriers to its development. The NTBFs success is strongly influenced by the management model in place since the start of its activities, even before the legal incorporation of the company. This paper presents a method of NTBFs management and development based on a methodology called CEC (Collaborative Venture Capital) developed by a group of angel investors acting since 2008 in Brazil. For illustrative purposes, we analyze the case of a successful startup, supported by that group

An ‘embedded brain’ approach to understanding antisocial behaviour

Antisocial behaviour (ASB) incurs substantial costs to the individual and society. Cognitive neuroscience has the potential to shed light on developmental risk for ASB, but it cannot achieve this potential in an ‘essentialist’ framework that focuses on the brain and cognition isolated from the environment. Here, we present the case for studying the social transactional and iterative unfolding of brain and cognitive development in a relational context. This approach, which we call the study of the ‘embedded brain’, is needed to fully understand how risk for ASB arises during development. Concentrated efforts are required to develop and unify methods to achieve this approach and reap the benefits for improved prevention and intervention of ASB.</p

An ‘embedded brain’ approach to understanding antisocial behaviour

Antisocial behaviour (ASB) incurs substantial costs to the individual and society. Cognitive neuroscience has the potential to shed light on developmental risk for ASB, but it cannot achieve this potential in an ‘essentialist’ framework that focuses on the brain and cognition isolated from the environment. Here, we present the case for studying the social transactional and iterative unfolding of brain and cognitive development in a relational context. This approach, which we call the study of the ‘embedded brain’, is needed to fully understand how risk for ASB arises during development. Concentrated efforts are required to develop and unify methods to achieve this approach and reap the benefits for improved prevention and intervention of ASB