Roots of Ehrhart Polynomials of Smooth Fano Polytopes

V. Golyshev conjectured that for any smooth polytope P of dimension at most five, the roots z\in\C of the Ehrhart polynomial for P have real part equal to -1/2. An elementary proof is given, and in each dimension the roots are described explicitly. We also present examples which demonstrate that this result cannot be extended to dimension six.Comment: 10 page

Transient Stability Enhancement Using Phasor Model of Superconducting Magnetic Energy Storage

Superconducting Magnetic Energy Storage (SMES) is one of most important device attracting researchers for enhancing the transient stability of power systems. To facilitate the use of this device in different simulations and studied, a phasor model is established and used to analyse the impact of this device using matlab/Simulink software. The phasor model has enough advantages like using the SMES without need detailed model that contains the electronic power converter and therefore minimize the simulation time. The Western Systems Council Coordinating (WSCC) 3 machine-9 bus system is taken as a power system test. Simulation results show that the phasor model of SMES unit is very effective to study their impact for enhancing the transient stability in large scale time

Transient Stability Enhancement Using Phasor Model of Superconducting Magnetic Energy Storage

Superconducting Magnetic Energy Storage (SMES) is one of most important device attracting researchers for enhancing the transient stability of power systems. To facilitate the use of this device in different simulations and studied, a phasor model is established and used to analyse the impact of this device using matlab/Simulink software. The phasor model has enough advantages like using the SMES without need detailed model that contains the electronic power converter and therefore minimize the simulation time. The Western Systems Council Coordinating (WSCC) 3 machine-9 bus system is taken as a power system test. Simulation results show that the phasor model of SMES unit is very effective to study their impact for enhancing the transient stability in large scale time

Politicas agrarias y estrategias campesinas en la Cuenca del Canete : anexos 14 a 19

Ce document présente des méthodologies d'enquêtes utilisées dans la microrégion de Yauyos (Vallée du haut Canete) afin de définir la communauté paysanne en tant qu'unité d'observation et d'analyser le système communal dans ses fonctions de pouvoir et d'organisation sociale. Sont également étudiées, les destinations de la production agropastorale de la famille paysanne : autoconsommation, troc, vente ainsi que les circuits de commercialisation

Sources and budgets for CO and O-3 in the northeastern Pacific during the spring of 2001: Results from the PHOBEA-II Experiment

Abstract. Ground and airborne measurements of CO, ozone, and aerosols were obtained in th

Análisis de la accesibilidad urbanística y arquitectónica: SIG de la accesibilidad de Mallorca

La movilidad es un derecho fundamental de todos los ciudadanos de aquí que el análisis de la accesibilidad y evaluación sea una exigencia que han de considerar los planificadores territoriales. Actualmente las tecnologías de la información geográfica constituyen un instrumento que facilitan el reconocimiento de las barreras arquitectónicas y urbanísticas, tanto desde el punto de vista técnico como del ciudadano. Sobre esta base, el presente artículo muestra el desarrollo del Sistema de Información Geográfica de la Accesibilidad de Mallorca (SIGMA) cuyo objetivo principal es el de facilitar información actualizada y precisa al ciudadano y, al mismo tiempo, diseñar una herramienta de análisis, evaluación y soporte a la toma de decisiones para la mejora de la accesibilidad urbana y arquitectónica. El proyecto se ha desarrollado de acuerdo al Decreto 20/2003 del Reglamento de Supresión de Barreras Arquitectónica, Boletín Oficial de las Islas Baleares 18-03-2003). La construcción del SIGMA ha sido realizada por un equipo de investigación de la Universidad de las Islas Baleares y un grupo de trabajo del Área de Accesibilidad del Consell de Mallorca.Mobility is a fundamental right of all citizens that is why the analysis accessibility and its evaluation are demands that have to be considered by the territorial planners. Currently geographical information technologies are instruments that provide the recognition of the architectural barriers and urban, both from the technical and from the citizen’s point of view. On this base, the present article shows the development of the Accessibility's Geographic information System of Majorca (SIGMA) whose main goal is that one of to provide up-to-date information and precise to the citizen and, at the same time, to design a tool of analysis, evaluation and support to the decision making for the improvement of the urban accessibility and architectural. The project has been developed according to the regulations (Decree 20/2003 of the Regulations of Barrier Suppression Architectural, Official Gazette of Balearic Islands 18-03-2003). The construction of the SIGMA has been made by a team of investigation of the University of Balearic Islands and a working group of the Area of Accessibility of the Council of Majorca

Lattice-point enumerators of ellipsoids

Minkowski's second theorem on successive minima asserts that the volume of a 0-symmetric convex body K over the covolume of a lattice \Lambda can be bounded above by a quantity involving all the successive minima of K with respect to \Lambda. We will prove here that the number of lattice points inside K can also accept an upper bound of roughly the same size, in the special case where K is an ellipsoid. Whether this is also true for all K unconditionally is an open problem, but there is reasonable hope that the inductive approach used for ellipsoids could be extended to all cases.Comment: 9 page