Qualidade fisiológica de sementes de feijão (Phaseolus vulgaris L.) em função da maturação e adubação com enxofre, nitrogênio e zinco

A cultura do feijoeiro (Phaseolus vulgaris L.) apresenta grande importância nutricional, possuindo alto teor de lisina, que atua na complementação às proteínas dos cereais, fibra alimentar, vitaminas do complexo B e carboidratos complexos. A adubação foliar pode contribuir para um melhor desempenho da planta em campo, haja vista a melhora nutricional das mesmas. Objetivou-se com este estudo determinar o ponto de maturação fisiológica de sementes de Phaseolus vulgaris L. das linhagens de quatro genótipos de feijão, do grupo carioca: CNFC-15458, CNFC-15513, BRS Estilo e Carioca Precoce, com diferentes aplicações de adubação foliar a base de enxofre, nitrogênio e zinco. O trabalho foi desenvolvido no período de 02 de abril a 02 de julho de 2015 na Fazenda Ponte da Braúna, distrito de Rive, Município de Alegre-ES, e no Laboratório de Análise de Sementes do Departamento de Produção Vegetal do Centro de Ciências Agrárias e Engenharias da Universidade Federal do Espírito Santo (CCAE-UFES), Alegre-ES. O experimento foi instalado em um espaçamento de 0,50 x 0,30 m. Os tratos culturais foram realizados de acordo com as especificações da cultura. Foram realizadas quatro adubações foliares: A0: testemunha (sem adubação foliar); A1: uma aplicação de adubo foliar após 15 dias da antese; A2: duas aplicações após 15 e 25 dias da antese, e A3: três aplicações após 15, 25 e 35 dias da antese. Na fase de inflorescência, quando aproximadamente 70% dos botões florais das plantas apresentavam-se na antese procedeu a etiquetagem de 2000 flores. A cada sete dias foram feitas as colheitas de vagens para análise morfométrica e umidade das vagens e sementes, germinação e vigor das sementes. Foram utilizadas quatro repetições de 25 sementes, desinfestadas com hipoclorito de sódio (imersão das sementes por dois minutos e meio), álcool 70% (imersão por 30 segundos) e captan, na dosagem de 2,0 g i.a. kg-2 de sementes. A semeadura foi feita em rolos de papel germitest, umedecidos com água destilada com volume equivalente a 3,0 vezes a massa do papel seco, e mantidos em câmara de germinação tipo B.O.D. a 25 ºC, sob luz constante. A contagem foi efetuada diariamente, computando-se o número de sementes que apresentaram protrusão da raiz primaria ≥ 2,0 mm. Foram computadas as porcentagens de germinação após cinco e nove dias. As sementes da linhagem-elite CNFC 15513 e a cultivar BRS Estilo apresentam maior qualidade fisiológica. A maturação fisiológica das sementes ocorre aos 84 e 91 dias, para as Linhagens-elite CNFC 15513, CNFC 15458 e cultivar BRS Estilo; e Carioca Precoce, respectivamente. A adubação foliar beneficia a qualidade fisiológica das sementes de feijão

Resultados de Pesquisa com Algodão no Estado da Bahia - Safra 2011/2012.

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Squeezed States of the Generalized Minimum Uncertainty State for the Caldirola-Kanai Hamiltonian

We show that the ground state of the well-known pseudo-stationary states for the Caldirola-Kanai Hamiltonian is a generalized minimum uncertainty state, which has the minimum allowed uncertainty $\Delta q \Delta p = \hbar \sigma_0/2$, where $\sigma_0 (\geq 1)$ is a constant depending on the damping factor and natural frequency. The most general symmetric Gaussian states are obtained as the one-parameter squeezed states of the pseudo-stationary ground state. It is further shown that the coherent states of the pseudo-stationary ground state constitute another class of the generalized minimum uncertainty states.Comment: RevTex4, 9 pages, no fingure; to be published in Journal of Physics

Managing affect in learners' questions in undergraduate science

This is the author's accepted manuscript. The final published article is available from the link below. Copyright @ 2012 Society for Research into Higher Education.This article aims to position students' classroom questioning within the literature surrounding affect and its impact on learning. The article consists of two main sections. First, the act of questioning is discussed in order to highlight how affect shapes the process of questioning, and a four-part genesis to question-asking that we call CARE is described: the construction, asking, reception and evaluation of a learner's question. This work is contextualised through studies in science education and through our work with university students in undergraduate chemistry, although conducted in the firm belief that it has more general application. The second section focuses on teaching strategies to encourage and manage learners' questions, based here upon the conviction that university students in this case learn through questioning, and that an inquiry-based environment promotes better learning than a simple ‘transmission’ setting. Seven teaching strategies developed from the authors' work are described, where university teachers ‘scaffold’ learning through supporting learners' questions, and working with these to structure and organise the content and the shape of their teaching. The article concludes with a summary of the main issues, highlighting the impact of the affective dimension of learning through questioning, and a discussion of the implications for future research

Algebraic approach in the study of time-dependent nonlinear integrable systems: Case of the singular oscillator

The classical and the quantal problem of a particle interacting in one-dimension with an external time-dependent quadratic potential and a constant inverse square potential is studied from the Lie-algebraic point of view. The integrability of this system is established by evaluating the exact invariant closely related to the Lewis and Riesenfeld invariant for the time-dependent harmonic oscillator. We study extensively the special and interesting case of a kicked quadratic potential from which we derive a new integrable, nonlinear, area preserving, two-dimensional map which may, for instance, be used in numerical algorithms that integrate the Calogero-Sutherland-Moser Hamiltonian. The dynamics, both classical and quantal, is studied via the time-evolution operator which we evaluate using a recent method of integrating the quantum Liouville-Bloch equations \cite{rau}. The results show the exact one-to-one correspondence between the classical and the quantal dynamics. Our analysis also sheds light on the connection between properties of the SU(1,1) algebra and that of simple dynamical systems.Comment: 17 pages, 4 figures, Accepted in PR

OBTAINING TEMPERATURE FIELDS AS A FUNCTION OF EFFICIENCY IN TIG WELDING BY NUMERICAL MODELING

The temperature field serves as the basis for predicting levels of residual stress in a welded joint. The aspects related to the mathematical modeling of complex welding procedures were pondered with the FEM: variations in the physical and mechanical properties of the materials as a function of the temperature, the transience and the speed of the welding process, the material phase transformations, the different mechanisms of heat exchange with the environment (convection and radiation), all them associated with a high level of nonlinearity. The heat source used in this analytical model for heat supply was the double ellipsoid model proposed by Goldak (2005), in which a 60 mm x 50 mm and 3 mm rectangular ASTM AH36 steel plate was used for the TIG process simulations. It was made a comparison of temperature fields for three different values of process efficiency (60%, 70% and 80%). The results showed many differences in the temperature fields following changes in the levels of residual stresses which will be determined in further studies