11,324 research outputs found

    Standard map in magnetized relativistic systems: fixed points and regular acceleration

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    We investigate the concept of a standard map for the interaction of relativistic particles and electrostatic waves of arbitrary amplitudes, under the action of external magnetic fields. The map is adequate for physical settings where waves and particles interact impulsively, and allows for a series of analytical result to be exactly obtained. Unlike the traditional form of the standard map, the present map is nonlinear in the wave amplitude and displays a series of peculiar properties. Among these properties we discuss the relation involving fixed points of the maps and accelerator regimes.Comment: Work to appear in Phys. Rev. E. 2 figure

    Alterações nas características químicas de um latossolo amarelo sob sistemas agroflorestais com cupuaçuzeiro no município de Presidente Figueiredo, AM.

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    Avaliação de algumas características químicas de um latossolo amarelo distrófico, sob dois sistemas agroflorestais com três tipos de manejo de adubação, durante oito anos

    Alternate islands of multiple isochronous chains in wave-particle interactions

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    We analyze the dynamics of a relativistic particle moving in a uniform magnetic field and perturbed by a standing electrostatic wave. We show that a pulsed wave produces an infinite number of perturbative terms with the same winding number, which may generate islands in the same region of phase space. As a consequence, the number of isochronous island chains varies as a function of the wave parameters. We observe that in all the resonances, the number of chains is related to the amplitude of the various resonant terms. We determine analytically the position of the periodic points and the number of island chains as a function of the wave number and wave period. Such information is very important when one is concerned with regular particle acceleration, since it is necessary to adjust the initial conditions of the particle to obtain the maximum acceleration.Comment: Submitte

    Desenvolvimento da técnica TRAP (Target region amplification polymorphism) para caracterização genética de guaranazeiro.

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    O objetivo desse trabalho foi desenhar e otimizar a técnica de TRAP (Target Region Amplification Polymorphism) para as aplicações diversas das análises de diversidade genética em guaranazeiro

    The Nova SBE University merchandising venture

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    A Work Project, presented as part of the requirements for the Award of a Masters Degree in Management from the NOVA – School of Business and EconomicsThe objective of this Work Project is twofold: to create a research project on the opportunities for launching a Nova School of Business and Economics (Nova SBE) merchandise project; and the description of the planned strategy for this project. The objective of the research is to identify, validate and measure what opportunities lie within offering NOVA SBE merchandise. The objective of the strategy’s plan is to provide a guideline for the project, so it can start being implemented as soon as possible. This guideline will include recommendations regarding the product line, pricing and marketing in the short and long-term
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