288 research outputs found
Neutrino mixing in a left-right model
We study the mixing among different generations of massive neutrino fields in
a
gauge theory which includes Majorana
and Dirac mass terms in the Yukawa sector. Parity can be spontaneously broken
at a scale GeV. We discuss about possible candidates for
the Yukawa coupling matrices and we found that the model can accommodate a
consistent pattern for neutral fermion masses as well as neutrino oscillations.
The left and right sectors can be connected by a new neutral current.Comment: 9 page
Approximate solutions for the skyrmion
We reconsider the Euler-Lagrange equation for the Skyrme model in the
hedgehog ansatz and study the analytical properties of the solitonic solution.
In view of the lack of a closed form solution to the problem, we work on
approximate analytical solutions. We show that Pade approximants are well
suited to continue analytically the asymptotic representation obtained in terms
of a power series expansion near the origin, obtaining explicit approximate
solutions for the Skyrme equations. We improve the approximations by applying
the 2-point Pade approximant procedure whereby the exact behaviour at spatial
infinity is incorporated. An even better convergence to the exact solution is
obtained by introducing a modified form for the approximants. The new
representations share the same analytical properties with the exact solution at
both small and large values of the radial variable r.Comment: 15 pages, 5 figures. 1 Reference adde
Approximate solutions for the single soliton in a Skyrmion-type model with a dilaton scalar field
We consider the analytical properties of the single-soliton solution in a
Skyrmion-type Lagrangian that incorporates the scaling properties of quantum
chromodynamics (QCD) through the coupling of the chiral field to a scalar field
interpreted as a bound state of gluons. The model was proposed in previous
works to describe the Goldstone pions in a dense medium, being also useful for
studying the properties of nuclear matter and the in-medium properties of
mesons and nucleons. Guided by an asymptotic analysis of the Euler-Lagrange
equations, we propose approximate analytical representations for the single
soliton solution in terms of rational approximants exponentially localized.
Following the Pad\'e method, we construct a sequence of approximants from the
exact power series solutions near the origin. We find that the convergence of
the approximate representations to the numerical solutions is considerably
improved by taking the expansion coefficients as free parameters and then
minimizing the mass of the Skyrmion using our ans\"atze for the fields. We also
perform an analysis of convergence by computation of physical quantities
showing that the proposed analytical representations are very useful useful for
phenomenological calculations.Comment: 13 pages, 3 eps figures, version to be published in Phys.Rev.
Dengue outbreaks pattern in southern Guatemala
This study analyses time series of dengue occurrence in the southern region of Guatemala. Temporal patterns of epidemic outbreaks in the department of Escuintla were investigated using the official reports from 2001 to 2013. In order to identify underlying associations with climate behavior, the epidemiological data were compared with historical reports available for temperature, rainfall and humidity. Preliminary results reveal that waves of dengue outbreaks exhibit a periodic pattern modulated by climatic conditions. A hierarchical cluster analysis allowed to indirectly estimate the degree of association of each climatic variable with dengue occurrences, showing the dominance of rainfall in dengue outbreaks patterns in three different localities. A further prospective analysis was performed to check whether epidemic trends driven by rainfall are hold in the subsequent years. Results presented here give support to predictive models for dengue incidence driven by climate
Valoração econômica da perda de solo na cultura de cana-de-açúcar colhida crua e queimada no municÃpio de Campos dos Goytacazes.
Este trabalho foi realizado no MunicÃpio de Campos dos Goytacazes, RJ e teve como objetivo valorar economicamente as perdas de solo em relação aos nutrientes perdidos na cultura de cana-de-açúcar sob dois sistemas distintos de colheita, cana-de-açúcar crua e queimada em áreas de baixada e de tabuleiro. Utilizou-se a Universal Soil Loss Equation ? USLE e o método do custo de reposição de nutrientes, para realizar a estimação econômica das perdas de solo. Os resultados mostram que a taxa de perda de solo da cana-de-açúcar queimada foi quatro vezes maior quando comparada à taxa para cana-de-açúcar colhida crua para ambas as áreas estudadas. O custo de reposição dos nutrientes perdidos no cultivo da cana-de-açúcar sob sistema de colheita com queima prévia apresentou um valor de R 2,61 por hectare em área de baixada e de R 10,89 para cana crua em tabuleiro. Dessa forma, o sistema de manejo da colheita da cana crua contribui ambientalmente e economicamente para a preservação da fertilidade do solo
You Are Your Best intervention: Utilizing Person-of-the-Therapist Training in Financial Therapy
The field of financial therapy recognizes the importance of the therapist\u27s self in facilitating effective client outcomes. Self-exploration involves a comprehensive exploration of the therapist\u27s relationship with money, allowing them to leverage their experiences, financial flashpoints, and money scripts ethically and effectively. By engaging in self-exploration, financial therapists become role models for their clients, inspiring them to embark on their personal growth journeys. However, therapists must exercise caution to avoid projecting their beliefs onto clients. This paper explores how one specific program on the self-of-the-therapist exploration, the person-of-the-therapist model (POTT; Aponte, 1982), can be applied to financial therapy self-work. This approach to self-exploration highlights the significance of self-knowledge, awareness, and management in facilitating effective financial therapy. It emphasizes discovering one’s signature theme (patterns, thoughts, or emotions that create challenges in functioning) and their role in shaping therapists\u27 client interactions. Additionally, the use of one’s own and their client’s genogram can facilitate insights. This article introduces a hypothetical case illustration to demonstrate POTT’s application to financial therapy. By embracing the POTT framework, financial therapists can enhance their self-awareness, manage their personal experiences, and optimize their therapeutic effectiveness, thus contributing to clients\u27 financial well-being and personal growth potential
Apreciaciones sobre la situación técnica de las tres plantas de fertilizantes de Fertica, SA, en Centroamérica: Puntarenas-Costa Rica: Acajutla-El Salvador: Tecum Uman-Guatemala
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