Carta Circular de la Red de Cooperación en la Gestión Integral de Recursos Hídricos para el Desarrollo Sustentable en América Latina y el Caribe N° 43

Editorial.-- Discusión abierta: Eficiencia energética y regulación económica en los servicios de agua potable ; Políticas e institucionalidad en materia de agua potable y saneamiento en la región.-- Noticias de la RED: Los países del Golfo Arábico y su objetivo de autosuficiencia alimentaria ; Hacia la reducción de las brechas en agua potable y saneamiento en Colombia ; Presupuesto participativo en agua potable: una oportunidad para los usuarios ; Ley de las organizaciones de usuarios de aguas del Perú ; Comisión de gestión integral de la Cuenca del Río Grande de Tárcoles en Costa Rica ; Unidad Gestora de agua y saneamiento en Panamá ; Cursos: Curso "Aspectos estratégicos del riego".-- Noticias sobre internet y WWW

Carta Circular de la Red de Cooperación en la Gestión Integral de Recursos Hídricos para el Desarrollo Sustentable en América Latina y el Caribe N° 44

Editorial .-- Discusión abierta: Nexo Agua, Energía y Alimentación. Conflictos por el agua en la región. Eficiencia energética y regulación. Políticas e institucionalidad en agua potable. Impactos y vulnerabilidad al cambio climático de los ríos de Mendoza y San Juan .-- Reuniones: − Políticas de Agua en el Contexto de la Agenda de Desarrollo Post-2015. Consulta Regional sobre Seguridad Hídrica. Latinosan 2016. -- Noticias de la Red: Bolivia: Ley de la Década del Riego. Chile: Política Nacional de Recursos Hídricos. Costa Rica: Comité Nacional de Hidrología y Meteorología. Honduras: Comisión Presidencial de Coordinación del Sector Agua. Perú: Decreto que Regula el Régimen de Monitoreo y Gestión de Aguas Subterráneas. -- Cursos: Tópicos Técnicos en Materia de Evacuación y Disposición de Aguas Servidas Rurales.

Generalized integral transform solution for hydrodynamically developing non-Newtonian flows in circular tubes

ABSTRACT: The Generalized Integral Transform Technique (GITT) is applied to the solution of the momentum equations in a hydrodynamically developing laminar flow of a non-Newtonian power-law fluid inside a circular duct. A primitive variables formulation is adopted in order to avoid the singularity of the auxiliary eigenvalue problem in terms of Bessel functions at the centerline of the duct when the GITT approach is applied. Results for the velocity field and friction factor-Reynolds number product are computed for different power-law indices, which are tabulated and graphically presented as functions of the dimensionless coordinates. Critical comparisons with previous results in the literature are also performed, in order to validate the numerical codes developed in the present work and to demonstrate the consistency of the final results.

Integral transform solution for the forced convection of herschel-bulkley fluids in circular tubes and parallel-plates ducts

ABSTRACT: The thermal entry region in laminar forced convection of Herschel-Bulkley fluids is solved analytically through the integral transform technique, for both circular and parallel-plates ducts, which are maintained at a prescribed wall temperature or at a prescribed wall heat flux. The local Nusselt numbers are obtained with high accuracy in both developing and fully-developed thermal regions, and critical comparisons with previously reported numerical results are performed.

Comparative analysis of circular and triangular gold nanodisks for field enhancement applications

ABSTRACT: In this paper, we present a quantitative comparison of circular and triangular gold nanodisks with the same length and thickness. The method of moments is used to solve numerically the scattering problem. With this model, we investigate the spatial near field distribution, spectral response, far field diagrams, and bandwidth wavelength of these particles. Our results show that the resonant wavelength and the near field enhancement and confinement of the triangular particle are larger than those for the circular particle, but the resonance bandwidth and scattering cross section of the triangular particle are smaller.

Scalar source in circular motion interacting with massive klein-gordon field in Minkowski spacetime

We analyze the scalar radiation emitted by a source in uniform circular motion in Minkowski spacetime interacting with a massive Klein-Gordon field. We assume the source rotating around a central object due to a Newtonian force. By considering the canonical quantization of this field, we use perturbation theory to compute the radiation emitted at the tree level. Regarding the initial state of the field as being the Minkowski vacuum, we compute the emission amplitude for the rotating source, assuming it as being minimally coupled to the massive Klein-Gordon field. We then compute the power emitted by the swirling source as a function of its angular velocity, as measured by asymptotic static observers.

Estudo de estirilpironas de Cryptocarya mandioccana por espectrometria de massas e análise configuracional por ressonância magnética nuclear e dicroísmo circular

Pós-graduação em Química - IQ

On the effects of each term of the geopotential perturbation along the time I: Quasi-circular orbits

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Dança circular sagrada: como ela interfere na vida de uma pessoa?

Enquanto arte, a dança circular sagrada, pode contribuir para a aproximação dos indivíduos, nela pode-se observar a estimulação da participação de todos, proporcionando presença, comunicação, espontaneidade, dedicação, afetividade, segurança, percepção, entre outros fatores que contribuem no processo educativo e nas relações interpessoais, no autoconhecimento, na disciplina, na autonomia. A dança circular pode ser caracterizada como dança de roda, muito semelhante a das brincadeiras de criança, ela recebe a titulação de “sagrada” pelo fato de que sua origem faz remissão aos cultos e aos ritos sagrados. Este trabalho tem como objetivo analisar como a dança circular pode intervir no cotidiano e na construção das relações sociais de um jovem, a partir de um estudo e de um apontamento das observações realizadas e suas análises. Como proposta metodológica pensamos na pesquisa bibliográfica uma vez que realizaremos a partir das leituras e do levantamento de informações e dados de como são construídas as relações e como a mesma pode afetar o homem

Dipolo e escoamento uniforme: escoamento em torno de um cilindro circular

The study of movements of ideals fluids is more simple that the viscous fluids because do not have the presence of tension of shear. The normal tensions are the one that must be considered in this analysis. The theory corresponding to these flows is the same used in other fields of the physics called Theory of Potentials Fields, which the vector identity is fundamental. Any flow into irrotational (null vorticity) physically possibly has a current function and a potential of velocity that satisfied the equation of Laplace. Reciprocally, any solution of equation of Laplace represents a current function or a potential of velocity of a flow into physically possible. Once the equation of Laplace is linear, the addiction of any numbers of solutions is also a solution. So, several potentials flows into can be constructed superposing configurations of elementary flows into. The purpose of the superposition of elementary flows into is a production of similar configurations to those of practical interest. The combination of mathematical elegancy with utility in the potential flow into attracted many for its study. Some of the most famous mathematician of history studied the theory and application of “hydrodynamic”, how was called the potential fluid into before 1900

Circular, elliptic and oval billiards in a gravitational field

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Sobre a desintegração de prótons em movimento circular em campos gravitacionais

Pós-graduação em Física - IFT

Comparative study of the proton beam effects between the conventional and Circular-Gate MOSFETs

The study of ionizing radiation effects on semiconductor devices is of great relevance for the global technological development and is a necessity in some strategic areas in Brazil. This work presents preliminary results of radiation effects in MOSFETs that were exposed to 3.2 Grad radiation dose produced by a 2.6-MeV proton beam. The focus of this work was to electrically characterize a Rectangular-Gate MOSFET (RGT) and a Circular-Gate MOSFET (CGT), manufactured with the On Semiconductor 0.5 mu m standard CMOS fabrication process and to verify a suitable geometry for space applications. During the experiment, I-DS x V-GS curves were measured. After irradiation, the RGT off-state current (I-OFF) increased approximately two orders of magnitude reaching practically the same value of the I-OFF in the CGT, which only doubled its value. (C) 2011 Elsevier B.V. All rights reserved.

URANS calculations for smooth circular cylinder flow in a wide range of Reynolds Numbers: solution verification and validation

The flow around circular smooth fixed cylinder in a large range of Reynolds numbers is considered in this paper. In order to investigate this canonical case, we perform CFD calculations and apply verification & validation (V&V) procedures to draw conclusions regarding numerical error and, afterwards, assess the modeling errors and capabilities of this (U)RANS method to solve the problem. Eight Reynolds numbers between Re = 10 and Re 5 x 10(5) will be presented with, at least, four geometrically similar grids and five discretization in time for each case (when unsteady), together with strict control of iterative and round-off errors, allowing a consistent verification analysis with uncertainty estimation. Two-dimensional RANS, steady or unsteady, laminar or turbulent calculations are performed. The original 1994 k - omega SST turbulence model by Menter is used to model turbulence. The validation procedure is performed by comparing the numerical results with an extensive set of experimental results compiled from the literature. [DOI: 10.1115/1.4007571]