Algumas cucurbitáceas hospedeiras do amarelão do meloeiro.

bitstream/CNPAT/7858/1/ct_73.pd

Transmissão do amarelão-do-meloeiro pela mosca-branca.

Transmissao do amarelao-do-meloeiro pela mosca-branca.bitstream/CNPAT-2010/8612/1/Ct-093.pd

Gravitational waves from extreme mass-ratio inspirals in Dynamical Chern-Simons gravity

Dynamical Chern-Simons gravity is an interesting extension of General Relativity, which finds its way in many different contexts, including string theory, cosmological settings and loop quantum gravity. In this theory, the gravitational field is coupled to a scalar field by a parity-violating term, which gives rise to characteristic signatures. Here we investigate how Chern-Simons gravity would affect the quasi-circular inspiralling of a small, stellar-mass object into a large non-rotating supermassive black hole, and the accompanying emission of gravitational and scalar waves. We find the relevant equations describing the perturbation induced by the small object, and we solve them through the use of Green's function techniques. Our results show that for a wide range of coupling parameters, the Chern-Simons coupling gives rise to an increase in total energy flux, which translates into a fewer number of gravitational-wave cycles over a certain bandwidth. For space-based gravitational-wave detectors such as LISA, this effect can be used to constrain the coupling parameter effectively.Comment: RevTex4, 18 pages, 7 figures, 1 tabl

Superkicks in ultrarelativistic encounters of spinning black holes

We study ultrarelativistic encounters of two spinning, equal-mass black holes through simulations in full numerical relativity. Two initial data sequences are studied in detail: one that leads to scattering and one that leads to a grazing collision and merger. In all cases, the initial black hole spins lie in the orbital plane, a configuration that leads to the so-called "superkicks". In astrophysical, quasicircular inspirals, such kicks can be as large as ~3,000 km/s; here, we find configurations that exceed ~15,000 km/s. We find that the maximum recoil is to a good approximation proportional to the total amount of energy radiated in gravitational waves, but largely independent of whether a merger occurs or not. This shows that the mechanism predominantly responsible for the superkick is not related to merger dynamics. Rather, a consistent explanation is that the "bobbing" motion of the orbit causes an asymmetric beaming of the radiation produced by the in-plane orbital motion of the binary, and the net asymmetry is balanced by a recoil. We use our results to formulate some conjectures on the ultimate kick achievable in any black hole encounter.Comment: 10 pages, 6 figures, 2 table

Rendimento de espiga verde de milho em resposta à adubação nitrogenada.

O experimento foi executado, sob regime de sequeiro, em solo de textura média, no município de Teresina, PI, no período de janeiro a março de 2004. Utilizou-se o delineamento experimental de blocos casualizados com quatro repetições e cinco doses de nitrogênio (0, 50, 100, 150 e 200 kg de N ha-1). Foi observado efeito quadrático para o rendimento de espigas verdes com e sem palha sendo os máximos rendimentos (22.178 e 13.321 kg ha-1) obtidos com 108 e 125 kg de N ha-1, respectivamente. O aumento médio nos rendimentos de espigas verde com e sem palha devido ao nitrogênio foram de 32,4% e 35,3%.Edição dos Anais do 47° Congresso Brasileiro de Olericultura; 4º Simpósio Brasileiro sobre Cucurbitáceas, Porto Seguro, ago. 2007. 1 CD-ROM

Avaliação de híbridos de melão quanto às principais doenças nos estados do Ceará e Rio Grande do Norte.

O presente trabalho foi realizado com o objetivo de avaliar o comportamento de híbridos comerciais de melão quanto à reação ao míldio (Pseudoperonospora cubensis), ao cancro-da-haste (Didymella bryoniae) e ao oídio (Sphaerotheca fuligineaJ. As avaliações para reação a essas doenças foram feitas no Campo Experimental de Pacajus, da Embrapa Agroindústria Tropical (Pacajus, CE), na Fazenda Dantas Empreendimentos (Jaguaruana, CE), na Fazenda Agrosagno (Quixeré, CE), e na Frunort (Carnaubais e Alto dos Rodrigues, RN), nos híbridos de melões Cantalupensis (Hy Mark, Durango, PX 20594, Temptation, AF 1749, Vera Cruz, Orange Flesh, CNPAT 27 x 01, CNPAT 27 x 07 e CNPAT 32 x 02) e Inodorus (Gold Mine, Gold Star, TSX 32096, Rochedo, Sunex 7056, Yellow Queen, PX 4910606, AF 464, AF 682 e Yellow King), utilizando-se uma escala de notas, variando de zero (sem sintoma) a quatro (sintoma severo). Com base nos resultados, observou-se que o híbrido CNPAT 32 x 02 foi pouco afetado pelo oídio e muito infectado por míldio e cancro-da-haste, enquanto que os híbridos TSX 32096 e PX 4910606 foram medianamente infectados pelo oídio e muito afetados pelas demais doenças. Os demais híbridos foram severamente infectados por todas as doenças.bitstream/CNPAT-2010/8602/1/Bd-016.pd

Plasmarings as dual black rings

We construct solutions to the relativistic Navier-Stokes equations that describe the long wavelength collective dynamics of the deconfined plasma phase of N=4 Yang Mills theory compactified down to d=3 on a Scherk-Schwarz circle and higher dimensional generalisations. Our solutions are stationary, axially symmetric spinning balls and rings of plasma. These solutions, which are dual to (yet to be constructed) rotating black holes and black rings in Scherk-Schwarz compactified AdS(5) and AdS(6), and have properties that are qualitatively similar to those of black holes and black rings in flat five dimensional supergravity.Comment: 40 pages, 40 figures. (v2) Correction to black brane equation of state, additional reference

Numerical relativity for D dimensional axially symmetric space-times: formalism and code tests

The numerical evolution of Einstein's field equations in a generic background has the potential to answer a variety of important questions in physics: from applications to the gauge-gravity duality, to modelling black hole production in TeV gravity scenarios, analysis of the stability of exact solutions and tests of Cosmic Censorship. In order to investigate these questions, we extend numerical relativity to more general space-times than those investigated hitherto, by developing a framework to study the numerical evolution of D dimensional vacuum space-times with an SO(D-2) isometry group for D\ge 5, or SO(D-3) for D\ge 6. Performing a dimensional reduction on a (D-4)-sphere, the D dimensional vacuum Einstein equations are rewritten as a 3+1 dimensional system with source terms, and presented in the Baumgarte, Shapiro, Shibata and Nakamura (BSSN) formulation. This allows the use of existing 3+1 dimensional numerical codes with small adaptations. Brill-Lindquist initial data are constructed in D dimensions and a procedure to match them to our 3+1 dimensional evolution equations is given. We have implemented our framework by adapting the LEAN code and perform a variety of simulations of non-spinning black hole space-times. Specifically, we present a modified moving puncture gauge which facilitates long term stable simulations in D=5. We further demonstrate the internal consistency of the code by studying convergence and comparing numerical versus analytic results in the case of geodesic slicing for D=5,6.Comment: 31 pages, 6 figures; v2 Minor changes and added two references. Matches the published version in PRD