Teste de patogenicidade de seis isolados de Curtobacterium flaccumfaciens pv. flaccumfaciens nas cultivares Ouro Branco, BRS Esplendor e CNFP 10132.

O objetivo deste trabalho foi verificar a patogenicidade de seis isolados por inoculação em três cultivares: Ouro Branco, BRS Esplendor e CNFP 10132

On kernel engineering via Paley–Wiener

A radial basis function approximation takes the form $$s(x)=\sum_{k=1}^na_k\phi(x-b_k),\quad x\in {\mathbb{R}}^d,$$ where the coefficients a 1,…,a n are real numbers, the centres b 1,…,b n are distinct points in ℝ d , and the function φ:ℝ d →ℝ is radially symmetric. Such functions are highly useful in practice and enjoy many beautiful theoretical properties. In particular, much work has been devoted to the polyharmonic radial basis functions, for which φ is the fundamental solution of some iterate of the Laplacian. In this note, we consider the construction of a rotation-invariant signed (Borel) measure μ for which the convolution ψ=μ φ is a function of compact support, and when φ is polyharmonic. The novelty of this construction is its use of the Paley–Wiener theorem to identify compact support via analysis of the Fourier transform of the new kernel ψ, so providing a new form of kernel engineering

Frequência haplotípica de Xanthomonas axonopodis pv. phaseoliestimada por Rep-PCR.

O objetivo deste trabalho foi estimar a frequência haplotípica de vinte isolados de Xap oriundos de quatro regiões produtoras de feijoeiro comum no Brasil.Pôster - pós-graduação

Detecção morfológica, patogênica e molecular de Curtobacterium flaccumfaciens pv. flaccumfaciensem feijoeiro comum.

A murcha-de-curtobacterium do feijoeiro causada por Curtobacterium flaccumfacienspv. flaccumfaciens (Cff), foi descrita em 1926, nos Estados Unidos e, no Brasil em 1995. Atualmente é encontrada nos estados de São Paulo, Paraná, Santa Catarina, Goiás, Distrito Federal e Mato Grosso do Sul. Por colonizar o xilema, os sintomas na planta infectada variam de flacidez e murcha das plantas ao encarquilhamento, queima do bordo das folhas, e até a morte da planta, podendo causar perdas de até 90% da produção. Com o objetivo de comparar os métodos para detecção de Cff, sete isolados bacterianos foram submetidos aos testes de detecção morfológica, patogênica e molecular.Apresentação oral - graduação

A coleção de Pseudocercospora griseola e sua importância para a pesquisa do feijoeiro comum.

O objetivo deste trabalho foi à obtenção, caracterização e manutenção de novos isolados de Pseudocercospora griseola para uso no programa de melhoramento genético da Embrapa.Pôster - graduação

Discrete Nonholonomic LL Systems on Lie Groups

This paper applies the recently developed theory of discrete nonholonomic mechanics to the study of discrete nonholonomic left-invariant dynamics on Lie groups. The theory is illustrated with the discrete versions of two classical nonholonomic systems, the Suslov top and the Chaplygin sleigh. The preservation of the reduced energy by the discrete flow is observed and the discrete momentum conservation is discussed.Comment: 32 pages, 13 figure

Novas raças de Fusarium oxysporum f.sp. phaseoli identificadas em Goiás e Minas Gerais, Brasil.

O objetivo deste trabalho foi verificar a variabilidade patogênica de isolados de Fop oriundos de 53 amostras coletadas em municípios de Minas Gerais e Goiás.Pôster - graduação

On spherical averages of radial basis functions

A radial basis function (RBF) has the general form $$s(x)=\sum_{k=1}^{n}a_{k}\phi(x-b_{k}),\quad x\in\mathbb{R}^{d},$$ where the coefficients a 1,…,a n are real numbers, the points, or centres, b 1,…,b n lie in ℝ d , and φ:ℝ d →ℝ is a radially symmetric function. Such approximants are highly useful and enjoy rich theoretical properties; see, for instance (Buhmann, Radial Basis Functions: Theory and Implementations, [2003]; Fasshauer, Meshfree Approximation Methods with Matlab, [2007]; Light and Cheney, A Course in Approximation Theory, [2000]; or Wendland, Scattered Data Approximation, [2004]). The important special case of polyharmonic splines results when φ is the fundamental solution of the iterated Laplacian operator, and this class includes the Euclidean norm φ(x)=‖x‖ when d is an odd positive integer, the thin plate spline φ(x)=‖x‖2log  ‖x‖ when d is an even positive integer, and univariate splines. Now B-splines generate a compactly supported basis for univariate spline spaces, but an analyticity argument implies that a nontrivial polyharmonic spline generated by (1.1) cannot be compactly supported when d>1. However, a pioneering paper of Jackson (Constr. Approx. 4:243–264, [1988]) established that the spherical average of a radial basis function generated by the Euclidean norm can be compactly supported when the centres and coefficients satisfy certain moment conditions; Jackson then used this compactly supported spherical average to construct approximate identities, with which he was then able to derive some of the earliest uniform convergence results for a class of radial basis functions. Our work extends this earlier analysis, but our technique is entirely novel, and applies to all polyharmonic splines. Furthermore, we observe that the technique provides yet another way to generate compactly supported, radially symmetric, positive definite functions. Specifically, we find that the spherical averaging operator commutes with the Fourier transform operator, and we are then able to identify Fourier transforms of compactly supported functions using the Paley–Wiener theorem. Furthermore, the use of Haar measure on compact Lie groups would not have occurred without frequent exposure to Iserles’s study of geometric integration

A coleção de culturas de microrganismos fitopatogênicos: importante fonte de informação para a pesquisa do feijoeiro comum.

O objetivo deste trabalho foi agrupar os diversos dados relativos à coleção de culturas de microrganismos patogênicos ao feijão da Embrapa Arroz e Feijão, visando ressaltar sua complexidade e importância para o desenvolvimento de plantas resistentes a doenças.CONAFE

Novel Data Acquisition System for Silicon Tracking Detectors

We have developed a novel data acquisition system for measuring tracking parameters of a silicon detector in a particle beam. The system is based on a commercial Analog-to-Digital VME module and a PC Linux based Data Acquisition System. This DAQ is realized with C++ code using object-oriented techniques. Track parameters for the beam particles were reconstructed using off-line analysis code and automatic detector position alignment algorithm. The new DAQ was used to test novel Czochralski type silicon detectors. The important silicon detector parameters, including signal size distributions and signal to noise distributions, were successfully extracted from the detector under study. The efficiency of the detector was measured to be 95 %, the resolution about 10 micrometers, and the signal to noise ratio about 10.Comment: Talk from the 2003 Computing in High Energy and Nuclear Physics (CHEP03), La Jolla, Ca, USA, March 2003, 6 pages, LaTeX, 5 eps figures. PSN TUGP00