On the 2D Dirac oscillator in the presence of vector and scalar potentials in the cosmic string spacetime in the context of spin and pseudospin symmetries

The Dirac equation with both scalar and vector couplings describing the dynamics of a two-dimensional Dirac oscillator in the cosmic string spacetime is considered. We derive the Dirac-Pauli equation and solve it in the limit of the spin and the pseudo-spin symmetries. We analyze the presence of cylindrical symmetric scalar potentials which allows us to provide analytic solutions for the resultant field equation. By using an appropriate ansatz, we find that the radial equation is a biconfluent Heun-like differential equation. The solution of this equation provides us with more than one expression for the energy eigenvalues of the oscillator. We investigate these energies and find that there is a quantum condition between them. We study this condition in detail and find that it requires the fixation of one of the physical parameters involved in the problem. Expressions for the energy of the oscillator are obtained for some values of the quantum number $n$. Some particular cases which lead to known physical systems are also addressed.Comment: 15 pages, 8 figures, matches published versio

Thermodynamics and dark energy

A significant observational effort has been directed to unveil the nature of the so-called dark energy. However, given the large number of theoretical possibilities, it is possible that such a task cannot be performed on the basis only of the observational data. In this article we discuss some thermodynamic properties of this energy component by assuming that its constituents are massless quanta with a general time-dependent equation-of-state parameter $\omega(z)=\omega_0 + \omega_a f(z)$, where $\omega_0$ and $\omega_a$ are constants and $f(z)$ may assume different forms. We show that very restrictive bounds can be placed on the $w_0$ - $w_a$ space when current observational data are combined with the thermodynamic constraints derived.Comment: 5 pages, 3 figures, LaTe

The impact of an 8-week Pilates-based physical training program on functional mobility: Data from a septuagenarian group

Study aim: This study aimed to evaluate the effects of a Pilates-based training program on functional mobility and strength in community-dwelling adults over 70 years old. Material and methods: Twenty community-dwelling elderly subjects were recruited and randomly assigned to control (C = 10) or Pilates training (PT = 10) groups for 8 weeks (2 times/week). Anthropometric, strength, cardiorespiratory fitness, functional mobility, and static and dynamic balance parameters were assessed before and after the intervention. Results: The PT group had higher values of lower limb strength (p = 0.013 d = 0.56) and 6-minute walking test distance (p = 0.04; d = 0.45) than the C group. The PT group also had differences in one leg stance duration and decrease in the Timed Up and Go test. We also observed a positive correlation between muscle strength and cardiorespiratory fitness (p < 0.01, r = 0.62), cardiorespiratory fitness and one leg stance, eyes closed, right and left leg (p = 0.04, r = 0.45; p = 0.05, r = 0.45, respectively). Conclusions: Eight weeks of Pilates-based physical training induced improvements in skeletal muscle strength and functional mobility of community-dwelling septuagenarians

Rendimento da bananeira tipo 'Terra' consorciada com mandioca.

Em regiões com tradição no monocultivo de mandioca e bananeira, especialmente do tipo Terra, pode ocorrer competição por área. Essa situação ocorre ou é afetada, a depender do preço desses produtos no mercado. No caso de mandioca para farinha, o preço é muito influenciado pelas leis de oferta e demanda, e com a tendência atual da redução de seu consumo, é esperado que as áreas com mandiocais sejam substituídas por bananeiras. Alternativamente, pode-se cultivar a mandioca entre fileiras de bananeiras. Na Fazenda Novo Horizonte, a Casa Familiar Rural e a Cooperativa de Produtores Rurais de Presidente Tancredo Neves, Bahia, têm estimulado a consorciação de bananeira cv. Terra (Musa spp., AAB) com a mandioca, considerando a flutuação de preço da mandioca numa região considerada como farinheira.pdf 178

Cenourete e Catetinho: mini cenouras brasileiras.

A tecnologia proposta viabiliza a utilização desta categoria de raízes, possibilitando a obtenção de CENOURETE, mini cenouras em forma de bolinhas, utilizando-se o processamento mínimo como forma de agregação de valor ao produto final