Moving Multi-Channel Systems in a Finite Volume with Application to Proton-Proton Fusion

The spectrum of a system with multiple channels composed of two hadrons with nonzero total momentum is determined in a finite cubic volume with periodic boundary conditions using effective field theory methods. The results presented are accurate up to exponentially suppressed corrections in the volume due to the finite range of hadronic interactions. The formalism allows one to determine the phase shifts and mixing parameters of pipi-KK isosinglet coupled channels directly from Lattice Quantum Chromodynamics. We show that the extension to more than two channels is straightforward and present the result for three channels. From the energy quantization condition, the volume dependence of electroweak matrix elements of two-hadron processes is extracted. In the non-relativistic case, we pay close attention to processes that mix the 1S0-3S1 two-nucleon states, e.g. proton-proton fusion (pp -> d+ e^+ + nu_e), and show how to determine the transition amplitude of such processes directly from lattice QCD.Comment: 20 pages, 3 figure

Socialización de experiencias de educación a nivel nacional de los departamentos y facultades de Ciencias básicas Bogotá-Colombia

La Universidad Manuela Beltrán buscó generar un espacio de socialización de experiencias de Educación en Ciencias Básicas, desde la formación científica, promoviendo la construcción de conocimiento, la reflexión continua y el diálogo entre saberes y prácticas, conducentes a la planificación de acciones al interior de las instituciones educativas que trasciendan al interior del aula. Se recibieron, analizaron y clasificaron por línea temáticas, sesenta y seis ponencias a nivel nacional. Con ello, se presenta así, una sistematización de con el objetivo de socializar a la comunidad académica los aspectos más relevantes de esta experiencia. Además de ofrecer como resultado los aprendizajes y parte de los análisis de las ponencias recibidas en el marco de este evento

Longitudinal oscillations in density stratified and expanding solar waveguides

Waves and oscillations can provide vital information about the internal structure of waveguides they propagate in. Here, we analytically investigate the effects of density and magnetic stratification on linear longitudinal magnetohydrodynamic (MHD) waves. The focus of this paper is to study the eigenmodes of these oscillations. It is our specific aim is to understand what happens to these MHD waves generated in flux tubes with non-constant (e.g., expanding or magnetic bottle) cross-sectional area and density variations. The governing equation of the longitudinal mode is derived and solved analytically and numerically. In particular, the limit of the thin flux tube approximation is examined. The general solution describing the slow longitudinal MHD waves in an expanding magnetic flux tube with constant density is found. Longitudinal MHD waves in density stratified loops with constant magnetic field are also analyzed. From analytical solutions, the frequency ratio of the first overtone and fundamental mode is investigated in stratified waveguides. For small expansion, a linear dependence between the frequency ratio and the expansion factor is found. From numerical calculations it was found that the frequency ratio strongly depends on the density profile chosen and, in general, the numerical results are in agreement with the analytical results. The relevance of these results for solar magneto-seismology is discussed.Comment: 10 pages, 5 figures, published in ApJ, uses emulateap

Proposed financial model for sustainable corporate growth

Issues such as technical and economic capacity in the production of goods and services, administrative and financial management, and marketing policies, are crucial for sustainable growth of organizations, understood as a dynamic process that has an effect on value creation of organizations. The objective of this paper is to define a model including the particular aspects of policy affecting sustainable growth corporate, based on the quantification of financial components. For the realization of this document took into account various studies and research concepts and approaches discussed trying to identify factors of growth corporate, such as planning, control, management, financial management and human resources, monitoring and evaluation, among others. However this document is limited to analyze components related to financial managementAspectos como la capacidad técnica y económica en la producción de bienes y servicios, la gestión administrativa y financiera, y las políticas de comercialización o mercadeo, son determinantes para el crecimiento sostenible de las organizaciones, entendido como un proceso dinámico que tiene efecto en la creación de valor de las mismas. El objetivo fundamental de este trabajo es definir un modelo que contenga los aspectos particulares que afectan una política de crecimiento corporativo sostenible, a partir de la cuantificación de componentes financieros. Para la realización de este documento se tuvieron en cuenta diversos estudios e investigaciones que exponen conceptos y enfoques que tratan de identificar factores de crecimiento corporativo, tales como planificación, control, dirección, manejo de recursos financieros y humanos, monitoreo y evaluación, entre otros1. Sin embargo, el presente documento se limitará a analizar componentes relacionados con la gestión financier