Searching for Elko dark matter spinors at the CERN LHC

The aim of this work is to explore the possibility to discover a fermionic field with mass dimension one, the Elko field, in the Large Hadron Collider (LHC). Due to its mass dimension, an Elko can only interact either with Standard Model (SM) spinors and gauge fields at 1-loop order or at tree level through a quartic interaction with the Higgs field. In this Higgs portal scenario, the Elko is a viable candidate to a dark matter constituent which has been shown to be compatible with relic abundance measurements from WMAP and direct dark matter--nucleon searches. We propose a search strategy for this dark matter candidate in the channel $pp \rightarrow l^+ l^- + \not\!\! E_T$ at the $\sqrt{s}=14$ TeV LHC. We show the LHC potential to discover the Elko considering a triple Higgs-Elko coupling as small as $\sim 0.5$ after 1 pb$^{-1}$ of integrated luminosity. Some phenomenological consequences of this new particle and its collider signatures are also discussed.Comment: 7 pages, 3 figure

Development of cognitive strategies with digital games in non-formal education

This paper presents a case study analyzing which learning cognitive strategies are employed by students who play digital games in both in-school and out-of-school learning contexts. As a case study, it falls within the qualitative research category. The researcher integrated themselves to the subjects' learning facility for data-gathering, following all recommended ethical protocols for research involving underage subjects. The following data collection instruments were used: research diary, questionnaire, and interviews, conducted with teenagers who play digital games during formal learning activities. Analysis involved data-crossing and checking our data against existing studies and theories, as well as a cartographic production. Data indicates that digital games enhance student usage of cognitive strategies and favor competencies and abilities-based learning over formal learning contents

Symmetry Constrained Two Higgs Doublet Models

We study Two-Higgs-Doublet Models (2HDM) where Abelian symmetries have been introduced, leading to a drastic reduction in the number of free parameters in the 2HDM. Our analysis is inspired in BGL models, where, as the result of a symmetry of the Lagrangian, there are tree-level scalar mediated Flavour-Changing-Neutral-Currents, with the flavour structure depending only on the CKM matrix. A systematic analysis is done on the various possible schemes, which are classified in different classes, depending on the way the extra symmetries constrain the matrices of couplings defining the flavour structure of the scalar mediated neutral currents. All the resulting flavour textures of the Yukawa couplings are stable under renormalisation since they result from symmetries imposed at the Lagrangian level. We also present a brief phenomenological analysis of the most salient features of each class of symmetry constrained 2HDM.Comment: 30 pages, 5 Table

Técnica para redução de tempo no cálculo de autovalores e autovetores aplicados a problemas de fonte fixa em transporte de nêutrons

In this work, a mathematical technique to accelerate the eigenvalue calculations, originally proposed for the Analytical Discrete Ordinates method (ADO), is applied to the coarse-mesh method Modified Spectral Deterministic (MSD), used in neutron shielding problems (fixed-source) in one-dimensional geometry. This technique consists in an arrangement of the neutron transport equation which leads to a reduced eigenvalue calculation on the intranodal analytical solution, where only the positive half of the eigenvalues and its respective eigenvectors are calculated, hence reducing the methods execution time. Precision and performance tests were performed in 2 model-problems, reducing around 80% of the execution time. All the codes were developed using the programming language C++.Neste trabalho, uma técnica matemática para acelerar os cálculos de autovalores, originalmente proposto para o método Analytical Discrete Ordinates (ADO), é aplicado para o método de malha grossa Modified Spectral Deterministic (MSD), usado em problemas de blindagem de nêutrons (fonte-fixa) em geometria unidimensional. Esta técnica consiste no arranjo da equação de transporte de nêutrons que leva a cálculos reduzidos de autovalores, onde são calculados apenas os autovalores positivos e seus respectivos autovetores, consequentemente reduzindo o tempo de execução do método. Testes de precisão e performance são realizados em 2 problemas-modelo, onde foram reduzidos cerca de 80% do tempo de execução. Todos os códigos foram desenvolvidos usando a linguagem de programação C++

Casa de turu é pau de mangue

Ensaio fotográfic

ANÁLISE DA AGRICULTURA IRRIGADA NO DISTRITO FEDERAL

This article aims to analyze the development of irrigated agriculture in the Federal District. In recent decades, agriculture has undergone major changes, the green revolution of the decade of 1960/1970 engendered a practice rooted in technological and scientifi c base that allowed maximizing production and minimizing costs. The growing demand pressed agriculture, requiring the insertion techniques such as irrigation, now widely disseminated. In the Federal District irrigation has established itself in the production of the fi eld system since the 1990, through government incentives. The methodology was adopted literature review, data collection and surveys and censuses of offi cial agencies.O presente artigo tem como objetivo analisar o desenvolvimento da agricultura irrigada no Distrito Federal. Nas últimas décadas a agricultura passou por grandes transformações, a revolução verde da década de 1960/1970 engendrou sua prática alicerçada numa base tecnológica e científi ca que permitiu a maximização da produção, bem como a minimização dos custos. A demanda crescente pressionou a agricultura, sendo necessário a inserção de técnicas como a irrigação, amplamente difundida atualmente. No Distrito Federal a irrigação já se consolidou no sistema produtivo do campo desde a década de 1990, através de incentivo governamental. Como metodologia foi adotada revisão bibliográfi ca, coleta de dados e levantamentos e censos de órgãos ofi ciais

SOCIEDADE DE RISCO E ESTADO DE DIREITO DIANTE DA HERMENÊUTICA DO DIREITO PENAL – RESOLUÇÃO DE CASOS DIFÍCEIS NA BUSCA DE RESPOSTAS CORRETAS, FRENTE A UM MODELO DE SEGURANÇA CIDADÃ VOLTADO PARA O DIREITO PENAL DO INIMIGO

Este artigo procura estabelecer as linhas gerais de um direito penal erigido numa sociedade de risco, baseado na herança positivista, traduzido num modelo de segurança que diferencia indivíduos de cidadãos, na qualificação de inimigos, importando num prejuízo à afirmação dos direitos fundamentais, nos termos de uma Constituição dirigente. Os princípios constitucionais na resolução dos chamados “casos difíceis”, podem funcionar como antídoto às influências totalitárias, contribuindo para a manutenção de um Estado Democrático de Direito