The coupling between a quantum dynamical system and a two-level system reservoir is analysed within the framework of the Feynman-Vernon theory.We stress the differences between this new reservoir and the well-known bath of oscillators and show that, in order to obtain the Langevin equation for the system of interest in the high temperature regime, we have to choose a spectral distribution function J(ω) which is finite for ω = 0.

We devise and apply a method for the calculation of the exact propagator for the Schrodinger equation for the one-dimensional Hamiltonian &(p,x)=p /2m + Voe(x). The limiting cases Vo -+0 (free particle) and Vo~~(opaque wall) are checked. The method is also applicable to any piecewiseconstant potential.

We study an isolated three-dimensional system composed of a slow one-freedom system of interest interacting with a soft-chaotic environment. We present numerical evidence that the averaged motion of the slow system is dissipative, though not exactly governed by the Langevin equation. An analytical reasoning is proposed to explain the results, circumventing the unsufficiency of the adiabatic hypothesis.

We derive a boundary integral equation to compute the eigenvalues of two-dimensional billiards subjected to a magnetic field. The integral requires the Green's function of the boundary-free problem with the magnetic field pointing in the opposite direction. This Green's function is computed for the case of a constant magnetic field perpendicular to the billiard and some applications are discussed. The elliptical billiard is then studied numerically as an example of a nontrivial application. ͓S1063-651X͑96͒05612-7͔ PACS number͑s͒: 05.45.ϩb, 03.65.Ϫw ប A•"ϩk 2 ϪA 2 /ប 2 ͬ ͑r͒ϭ0, ͑3͒ *Present address: School of Mathematics, University Walk, Bristol BS8 1TW, United Kingdom.

ResumoDiscute-se o cenário atual da Psicologia Escolar no Maranhão, tendo como parâmetro as transformações ocorridas nas últimas décadas em âmbito nacional. Foi realizado um estudo bibliográfico sobre o tema, a partir do qual se levantaram reflexões sobre o histórico e as tendências atuais no âmbito da formação e atuação do psicólogo escolar no estado. Considera-se que no Maranhão necessita-se da contribuição de psicólogos escolares que, seguros de seu papel e intencionalidade, construam uma identidade profissional comprometida com as transformações sociais do contexto local, o que começa a se efetivar através do aprimoramento da formação na área.Palavras-chave: Psicologia Escolar, formação do psicólogo, atuação do psicólogo. School Psychology in Brazil and in the State of Maranhão: history and current trends AbstractThis paper presents a discussion on the current scenario in School Psychology in the State of Maranhão. We use, as parameter, the transformations that occurred throughout the country in the last decades. . A bibliographic study on the subject has been carried out and used for later reflections about the history and current trends regarding the training and work of school psychologists in the State of Maranhão. We concluded that Maranhão needs the contribution of school psychologists who are certain of their role and intentions so they can build their professional identity with commitment to local social transformations, which starts with the improvement of expertise in the area.Keywords: School Psychology, psychologist performance, psychologist education. Psicología escolar en Brasil y en Maranhão: Recorridos históricos y tendencias ResumenSe discute el escenario actual de la Psicología Escolar en el estado de Maranhão, usando como parámetro las transformaciones de las últimas décadas en el ámbito nacional. Fue realizado un estudio bibliográfico sobre el tema, a partir del cual se levantaron reflexiones sobre la historia y las tendencias actuales en el ámbito de la formación y actuación del psicólogo escolar en el estado. Se considera que en Maranhão es necesaria la contribución de psicólogos escolares que, seguros de su papel e intencionalidad, construyan una identidad profesional comprometida con las transformaciones sociales del contexto local, lo que comienza a hacerse efectivo a través del perfeccionamiento de la formación en el área.Palabras-clave: Psicología escolar, formación del psicólogo, actuación del psicólogo.Revista Semestral da Associação Brasileira de Psicologia Escolar e Educacional (ABRAPEE) * Volume 13, Número 1, Janeiro/Junho de 2009 * 65-73.