1,831 research outputs found
Systematic Differential Renormalization to All Orders
We present a systematic implementation of differential renormalization to all
orders in perturbation theory. The method is applied to individual Feynamn
graphs written in coordinate space. After isolating every singularity. which
appears in a bare diagram, we define a subtraction procedure which consists in
replacing the core of the singularity by its renormalized form givenby a
differential formula. The organizationof subtractions in subgraphs relies in
Bogoliubov's formula, fulfilling the requirements of locality, unitarity and
Lorentz invariance. Our method bypasses the use of an intermediate
regularization andautomatically delivers renormalized amplitudes which obey
renormalization group equations.Comment: TEX, 20 pages, UB-ECM-PF 93/4, 1 figureavailable upon reques
Una nueva especie y un nuevo registro de uredinales que parasitan a Conyza bonariensis en Colombia
A new anamorphic species of Uredinales, Aecidium convzee- colombiensis, is proposed, and another one, Caeoma cyclostoma, is recorded for the first time for Colombia. The two species parasitize Conyza bonariensis (Asteraceae).<br>Se propone una nueva especie anamórfica de Uredinales, Aecidium convzee-co-lombiensis, y se registra por primera vez en Colombia a Caeoma cyclostoma, ambas parasitas de Conyza bonariensis (Asteraceae)
Plan de sensibilización para la apropiación de la calidad dirigido al soldado profesional colombiano_ Guía de bolsillo
La Guía de bolsillo de Calidad dirigida a los soldados profesionales contribuye de manera específica al sistema de gestión de calidad del Ejército Nacional, buscando perfeccionar la base de la organización, que es el soldado profesional colombiano siendo este el principal participante de la seguridad nacional, misión principal del Ejército Colombiano_ En este artículo se explica la necesidad que tiene soldado por conocer los términos más relevantes del Sistema Gestión de Calidad SGC, que es la calidad, como se aplica, bajo que normatividad se encuentra y de esta manera minimizar los riesgos por desconocimiento_The Pocket Guide to Quality professional soldiers directed specifically contributes to the quality management system of the Army, seeking to perfect the base of the organization, which is the Colombian professional soldier being the main participant in the national security mission Colombian army chief_ This article explains soldier's need to know the most relevant terms of the QMS Quality Management System, which is quality, as applied, under what regulation is and thus minimize risks due to ignorance
The disaster of the Nazi-power in science as reflected by some leading journals and scientists in physics - A bibliometric study
The consequences of the Nazi-power for the scientific process are described
qualitatively in various articles and books. However, recent progress in
information systems allows a quantitative reflection. Literature databases
ranging back to the beginning of the 20th century, the ISI citation indexes
ranging back to 1945 now and sophisticated search systems are suitable tools
for this purpose. In this study the overall break in the scientific
productivity and that of selected physical journals are examined. An overview
of the citation impact of some 50 leading physicists is given. The productivity
before and after departure is analyzed and connected to biographical data.Comment: 8 pages, 10 figures, 1 tabl
Notas sobre el género "Poa" en la Península Ibérica
Se relacionan y comentan las especies del género Poa en la Península Ibérica. Se hace una nueva combinación: P. trivialis L. subsp. feratiana (Boiss. et Reuter) A. M. Hernández.An outline of species of genus Poa in Iberian Peninsule is given. A new combination is made: P. trivialis L. subsp. feratiana (Boiss. et Reuter) A. M. Hernández
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