Structural and dynamical properties of a quasi-one-dimensional classical binary system

The ground state configurations and the \lq{}\lq{}normal\rq{}\rq{} mode spectra of a $quasi$-one-dimensional (Q1D) binary system of charged particles interacting through a screened Coulomb potential are presented. The minimum energy configurations were obtained analytically and independently through molecular dynamic simulations. A rich variety of ordered structures were found as a function of the screening parameter, the particle density, and the ratio between the charges of the distinct types of particles. Continuous and discontinuous structural transitions, as well as an unexpected symmetry breaking in the charge distribution are observed when the density of the system is changed. For near equal charges we found a disordered phase where a mixing of the two types of particles occurs. The phonon dispersion curves were calculated within the harmonic approximation for the one- and two-chain structures.Comment: 11 pages, 11 fig

Regulação econômica e direito desportivo : organização, concorrência e perspectivas regulatórias no mercado esportivo brasileiro

Monografia (graduação)—Universidade de Brasília, Faculdade de Direito, 2015.O presente trabalho tem por objetivo investigar as peculiaridades econômicas do mercado esportivo, especialmente no cenário de crise do esporte brasileiro, frente às possibilidades de regulação advindas do Direito Econômico. A pesquisa é divida em três partes, tratando preliminarmente dos agentes internos do mercado desportivo, quais sejam as entidade de prática e as entidades de administração, bem como a relação destas com o torcedor, consumidor do espetáculo esportivo. Em seguida, no capítulo II, a dinâmica concorrencial deste mercado é posta em análise, inclusive observando possíveis condutas anticoncorrenciais existentes neste mercado e seus respectivos efeitos. No último capítulo são vislumbradas perspectivas regulatórias a partir da experiência europeia e da viabilidade de aplicação de modelos adaptados ao cenário nacional. Ao fim do trabalho são apontados métodos específicos para combater as condutas anticompetitivas identificadas ao longo do estudo, bem como a hipótese de adoção de um modelo regulatório específico voltado a este setor econômico. Cogita-se ainda a criação de um sistema próprio de intervenção econômica em entidades desportivas em crise. ___________________________________________________________________________ ABSTRACTThis essay aims to analyze the economics peculiarities of sports market, especially in the Brazilian crisis scenario, and regulation possibilities brought by Economic Law. The research is divided in three parts, firstly providing an overview of the internal agents of sports market, which are the administration bodies and the practice entities, as well as its connection with the sports fan as a consumer. Thereafter, in Chapter II, the economic competition dynamics is analyzed, which includes anticompetitive practices that can be found in this market and its effects. Finally, the last chapter brings regulatory perspectives from the European experience and the application feasibility of economic models adapted to the Brazilian situation. At the end of the essay, specific methods to address the issues indentified by the research are pointed, such as the creation of a sports regulatory agency and also a new model of insolvency act for sports failing firms

Magnetic Branes Supported by Nonlinear Electromagnetic Field

Considering the nonlinear electromagnetic field coupled to Einstein gravity in the presence of cosmological constant, we obtain a new class of $d$-dimensional magnetic brane solutions. This class of solutions yields a spacetime with a longitudinal nonlinear magnetic field generated by a static source. These solutions have no curvature singularity and no horizons but have a conic geometry with a deficit angle $\delta \phi$. We investigate the effects of nonlinearity on the metric function and deficit angle and also find that for the special range of the nonlinear parameter, the solutions are not asymptotic AdS. We generalize this class of solutions to the case of spinning magnetic solutions, and find that when one or more rotation parameters are nonzero, the brane has a net electric charge which is proportional to the magnitude of the rotation parameters. Then, we use the counterterm method and compute the conserved quantities of these spacetimes. Finally, we obtain a constrain on the nonlinear parameter, such that the nonlinear electromagnetic field is conformally invariant.Comment: 15 pages, one eps figur

Help or hindrance? The evolutionary impact of whole‐genome duplication on immunogenetic diversity and parasite load

Whole‐genome duplication (WGD) events occur in all kingdoms and have been hypothesized to promote adaptability. WGDs identified in the early history of vertebrates, teleosts, and angiosperms have been linked to the large‐scale diversification of these lineages. However, the mechanics and full outcomes of WGD regarding potential evolutionary impacts remain a topic of debate. The Corydoradinae are a diverse subfamily of Neotropical catfishes with over 170 species described and a history of WGDs. They are divided into nine mtDNA lineages, with species coexisting in sympatric—and often mimetic—communities containing representatives of two or more of the nine lineages. Given their similar life histories, coexisting species of Corydoras might be exposed to similar parasite loads and because of their different histories of WGD and genome size they provide a powerful system for investigating the impacts of WGD on immune diversity and function in an animal system. Here, we compared parasite counts and the diversity of the immune‐related toll‐like receptors (TLR) in two coexisting species of Corydoras catfish (C. maculifer and C. araguaiaensis), one diploid and one putative tetraploid. In the putative tetraploid C. araguaiaensis, we found significantly lower numbers of parasites and significantly higher diversity (measured by both synonymous and nonsynonymous SNP counts) in two TLR genes than in the diploid C. maculifer. These results provide insight into how WGD may impact evolution, in this case by providing greater immunogenetic diversity

The 4th International Conference on Food Digestion

Food Digestion is the process that lies between the foodwe consume and any health benefits that it may impart. In a world where food related disease is already a significant and increasing burden on health services,it is important to understand the link between food and health. This requires a range of approaches including the use of in vitro simulations of the digestive process. However, if experimental data is to be comparable and useful it needs to make use of harmonised and physiologically relevant methods. The Infogest static model [9] offers such amethod and has been cited in more than 100 times.The success of this article confirms the interest in understanding the links between food structure and health

Simulating chemistry using quantum computers

The difficulty of simulating quantum systems, well-known to quantum chemists, prompted the idea of quantum computation. One can avoid the steep scaling associated with the exact simulation of increasingly large quantum systems on conventional computers, by mapping the quantum system to another, more controllable one. In this review, we discuss to what extent the ideas in quantum computation, now a well-established field, have been applied to chemical problems. We describe algorithms that achieve significant advantages for the electronic-structure problem, the simulation of chemical dynamics, protein folding, and other tasks. Although theory is still ahead of experiment, we outline recent advances that have led to the first chemical calculations on small quantum information processors.Comment: 27 pages. Submitted to Ann. Rev. Phys. Che