Poynting Vector Flow in a Circular Circuit

A circuit is considered in the shape of a ring, with a battery of negligible size and a wire of uniform resistance. A linear charge distribution along the wire maintains an electrostatic field and a steady current, which produces a constant magnetic field. Earlier studies of the Poynting vector and the rate of flow of energy considered only idealized geometries in which the Poynting vector was confined to the space within the circuit. But in more realistic cases the Poynting vector is nonzero outside as well as inside the circuit. An expression is obtained for the Poynting vector in terms of products of integrals, which are evaluated numerically to show the energy flow. Limiting expressions are obtained analytically. It is shown that the total power generated by the battery equals the energy flowing into the wire per unit time.Comment: 19 pages, 8 figure

An explicit Schr\"odinger picture for Aharonov's Modular Variable concept

We propose to address in a natural manner, the modular variable concept explicitly in a Schr\"odinger picture. The idea of Modular Variables was introduced in 1969 by Aharonov, Pendleton and Petersen to explain certain non-local properties of quantum mechanics. Our approach to this subject is based on Schwinger's finite quantum kinematics and it's continuous limit.Comment: 16 pages, 9 figure

Loop variables in the geometry of a rotating black string

In this paper we analyze in the Wilson loop context the parallel transport of vectors and spinors around a closed loop in the background space-time of a rotating black string in order to classify its global properties. We also examine particular closed orbits in this space-time and verify the Mandelstam relations.Comment: 14 pages, iopart styl

Holonomy Transformation in the FRW Metric

In this work we investigate loop variables in Friedman-Robertson-Walker spacetime. We analyze the parallel transport of vectors and spinors in several paths in this spacetime in order to classify its global properties. The band holonomy invariance is analysed in this background.Comment: 8 page

Caracterização da diversidade genética de genitores de amendoim forrageiro por meio de marcadores microssatélites.

O amendoim forrageiro é uma leguminosa herbácea tropical com destaque em sua utilização na agropecuária. Este trabalho teve o objetivo de caracterizar molecularmente nove acessos do Banco Ativo de Germoplasma da Embrapa Acre utilizados como genitores em cruzamentos de Arachis spp. por meio de marcadores microssatélites. Foram utilizados seis locos microssatélites para a caracterização dos acessos de A. pintoi e A. repens. Através da genotipagem molecular dos locos foi possível caracterizar os nove genitores, estimar a distância genética entre eles e agrupá-los em um dendrograma. Os acessos mais similares foram Ap53 e Ap75, e o que mais apresentou isolamento no agrupamento foi Ar67 único representante da espécie A. repens. A utilização de marcadores moleculares se mostrou eficiente na caracterização desses genitores e será importante na geração de novas combinações híbridas entre os acessos utilizados no programa de melhoramento da espécie