Scaling Invariance in a Time-Dependent Elliptical Billiard

We study some dynamical properties of a classical time-dependent elliptical billiard. We consider periodically moving boundary and collisions between the particle and the boundary are assumed to be elastic. Our results confirm that although the static elliptical billiard is an integrable system, after to introduce time-dependent perturbation on the boundary the unlimited energy growth is observed. The behaviour of the average velocity is described using scaling arguments

Sistema "SELEGEN" - seleção genética computadorizada para o melhoramento de espécies perenes.

O software Selegen foi desenvolvido para subsidiar o melhoramento genético de espécies florestais; entretanto, pode ser utilizado para outras espécies vegetais perenes ou semi-perenes e animais, em que a seleção de indivíduos prevalece sobre a seleção de grupos de indivíduos. Desenvolvido para ambiente IBM/PC-DOS, o programa é fundamentado em algoritmos que maximizam a eficiência do processo seletivo, mediante a comparação de vários métodos de seleção, com vistas a diferentes situações experimentais, em termos de acurácia, ganho genético, tamanho efetivo e variáveis de ganhos genéticos. Neste trabalho são apresentados os aspectos que devem ser considerados nos métodos destinados à seleção de indivíduos, e são apresentadas análises que podem ser realizadas com o software

Self-Similar Collapse of Scalar Field in Higher Dimensions

This paper constructs continuously self-similar solution of a spherically symmetric gravitational collapse of a scalar field in n dimensions. The qualitative behavior of these solutions is explained, and closed-form answers are provided where possible. Equivalence of scalar field couplings is used to show a way to generalize minimally coupled scalar field solutions to the model with general coupling.Comment: RevTex 3.1, 15 pages, 3 figures; references adde

Sistema de Produção Integrada do leite de cabra na região do Cariri Paraibano.

Resumo: O Sistema Agropecuário de Produção Integrada (SAPI) é uma política pública voltada à obtenção de alimentos seguros, para atender exigências sanitárias, tecnológicas, ambientais e sociais deste novo mercado consumidor. O sistema emprega tecnologias, as quais permitem a aplicação de Boas Práticas Agropecuárias (BPA) e controle efetivo de todo o processo produtivo. Idealizou-se o presente estudo, com o objetivo de implementar medidas de BPA em duas propriedades do Cariri Paraibano, as quais se tornarão Unidades Técnicas de Referência Local (UTRL) para o Sistema Agropecuário de Produção Integrada de Caprinocultura Leiteira. Os resultados obtidos demonstraram que esse modelo de produção tem potencial para proporcionar uma nova competitividade para a produção de leite de cabra e derivados. [Integrated production system for goat milk in the cariri region of paraíba, Brazil]. Abstract: Goat milk is an inclusion product in family agriculture within the institutional and other new types of markets. In northeastern Brazil where as a rule all goat milk goes to school meal-provisions, goat breeding in family homesteads is being developed in expansion hubs even though such features as quantity and quality required improvement. The Agricultural-Stockbreeding System of Integrated Production (SAPI) is a government policy for safe food deemed to comply with sanitary, technological, environmental and social requirements of the new consumer market. The system employs technologies through the application of Good Agricultural Practices (GAP) and efficient control throughout the production process. Current analysis aims at deploying GAP on two farms in the Cariri region of the state of Paraíba, Brazil, which will become the Technical Units for Local Reference for the Agricultural-Stockbreeding System of Integrated Production. Results show that the production model is capable of providing new competitiveness for the production of goat milk and derived products

Environmental Turbulence, New Product Development and Innovation

This study aimed to implement a systematic review of literature, in order to find theoretical support on the relationship between new product development and product innovation, moderated by environmental turbulence in the technological and market dimensions. It was used the qualitative approach, with data and information collected from published articles on the subject. The criteria researched consisted of: temporal cut from 2000 to May 2015, the article must belong to the area of Business Management or Economy, to present relationship with Environmental Turbulence, Development of New Products and product innovation. In the literature used, it was not possible found any article presenting an integrative model using New Product Development or Product Innovation moderated by environmental turbulence in its two dimensions. Based on the review accomplished, it is possible to define more four subjects to be studied in future empirical works approach these elements

FINITE SIZE SCALING FOR FIRST ORDER TRANSITIONS: POTTS MODEL

The finite-size scaling algorithm based on bulk and surface renormalization of de Oliveira (1992) is tested on q-state Potts models in dimensions D = 2 and 3. Our Monte Carlo data clearly distinguish between first- and second-order phase transitions. Continuous-q analytic calculations performed for small lattices show a clear tendency of the magnetic exponent Y = D - beta/nu to reach a plateau for increasing values of q, which is consistent with the first-order transition value Y = D. Monte Carlo data confirm this trend.Comment: 5 pages, plain tex, 5 EPS figures, in file POTTS.UU (uufiles

Danos provicados por Cebus nigritus (Goldfuss, 1809) a plantios de Pinus taeda L: frequência e perdas de incremento.

Resumo

Suppression of Anderson localization of light and Brewster anomalies in disordered superlattices containing a dispersive metamaterial

Light propagation through 1D disordered structures composed of alternating layers, with random thicknesses, of air and a dispersive metamaterial is theoretically investigated. Both normal and oblique incidences are considered. By means of numerical simulations and an analytical theory, we have established that Anderson localization of light may be suppressed: (i) in the long wavelength limit, for a finite angle of incidence which depends on the parameters of the dispersive metamaterial; (ii) for isolated frequencies and for specific angles of incidence, corresponding to Brewster anomalies in both positive- and negative-refraction regimes of the dispersive metamaterial. These results suggest that Anderson localization of light could be explored to control and tune light propagation in disordered metamaterials.Comment: 4 two-column pages, 3 figure

Dotted and Undotted Algebraic Spinor Fields in General Relativity

We investigate using Clifford algebra methods the theory of algebraic dotted and undotted spinor fields over a Lorentzian spacetime and their realizations as matrix spinor fields, which are the usual dotted and undotted two component spinor fields. We found that some ad hoc rules postulated for the covariant derivatives of Pauli sigma matrices and also for the Dirac gamma matrices in General Relativity cover important physical meaning, which is not apparent in the usual matrix presentation of the theory of two components dotted and undotted spinor fields. We also discuss some issues related to the the previous one and which appear in a proposed "unified" theory of gravitation and electromagnetism which use two components dotted and undotted spinor fields and also paravector fields, which are particular sections of the even subundle of the Clifford bundle of spacetime.Comment: some new misprints have been correcte

GHASP: an Hα\alpha kinematic survey of spiral galaxies - X. Surface photometry, decompositions and the Tully-Fisher relation in the Rc-band

We present Rc-band surface photometry for 170 of the 203 galaxies in GHASP, Gassendi H-Alpha survey of SPirals, a sample of late-type galaxies for which high-resolution Fabry-Perot H{\alpha} maps have previously been obtained. Our data set is constructed by new Rc-band observations taken at the Observatoire de Haute-Provence (OHP), supplemented with Sloan Digital Sky Survey (SDSS) archival data, obtained with the purpose of deriving homogeneous photometric profiles and parameters. Our results include Rc-band surface brightness profiles for 170 galaxies and $ugriz$ profiles for 108 of these objects. We catalogue several parameters of general interest for further reference, such as total magnitude, effective radius and isophotal parameters -- magnitude, position angle, ellipticity and inclination. We also perform a structural decomposition of the surface brightness profiles using a multi-component method in order to separate disks from bulges and bars, and to observe the main scaling relations involving luminosities, sizes and maximum velocities. We determine the Rc-band Tully Fisher relation using maximum velocities derived solely from H$\alpha$ rotation curves for a sample of 80 galaxies, resulting in a slope of $-8.1 \pm 0.5$, zero point of $-3.0 \pm 1.0$ and an estimated intrinsic scatter of $0.28 \pm 0.07$. We note that, different from the TF-relation in the near-infrared derived for the same sample, no change in the slope of the relation is seen at the low-mass end (for galaxies with $V_{max} < 125$ km/s). We suggest that this different behaviour of the Tully Fisher relation (with the optical relation being described by a single power-law while the near-infrared by two) may be caused by differences in the stellar mass to light ratio for galaxies with $V_{max} < 125$ km/s.Comment: 17 pages, 11 figure