Superintegrable Oscillator and Kepler Systems on Spaces of Nonconstant Curvature via the St\"ackel Transform

The St\"ackel transform is applied to the geodesic motion on Euclidean space, through the harmonic oscillator and Kepler-Coloumb potentials, in order to obtain maximally superintegrable classical systems on N-dimensional Riemannian spaces of nonconstant curvature. By one hand, the harmonic oscillator potential leads to two families of superintegrable systems which are interpreted as an intrinsic Kepler-Coloumb system on a hyperbolic curved space and as the so-called Darboux III oscillator. On the other, the Kepler-Coloumb potential gives rise to an oscillator system on a spherical curved space as well as to the Taub-NUT oscillator. Their integrals of motion are explicitly given. The role of the (flat/curved) Fradkin tensor and Laplace-Runge-Lenz N-vector for all of these Hamiltonians is highlighted throughout the paper. The corresponding quantum maximally superintegrable systems are also presented

An analytical solution for the magneto-electro-elastic bimorph beam forced vibrations problem

Based on the Timoshenko beam theory and on the assumption that the electric and magnetic fields can be treated as steady, since elastic waves propagate very slowly with respect to electromagnetic ones, a general analytical solution for the transient analysis of a magneto-electro-elastic bimorph beam is obtained. General magneto-electric boundary conditions can be applied on the top and bottom surfaces of the beam, allowing us to study the response of the bilayer structure to electromagnetic stimuli. The model reveals that the magneto-electric loads enter the solution as an equivalent external bending moment per unit length and as time-dependent mechanical boundary conditions through the definition of the bending moment. Moreover, the influences of the electro-mechanic, magneto-mechanic and electromagnetic coupling on the stiffness of the bimorph stem from the computation of the beam equivalent stiffness constants. Free and forced vibration analyses of both multiphase and laminated magneto-electro-elastic composite beams are carried out to check the effectiveness and reliability of the proposed analytic solution.Based on the Timoshenko beam theory and on the assumption that the electric and magnetic fields can be treated as steady, since elastic waves propagate very slowly with respect to electromagnetic ones, a general analytical solution for the transient analysis of a magneto-electro-elastic bimorph beam is obtained. General magneto-electric boundary conditions can be applied on the top and bottom surfaces of the beam, allowing us to study the response of the bilayer structure to electromagnetic stimuli. The model reveals that the magneto-electric loads enter the solution as an equivalent external bending moment per unit length and as time-dependent mechanical boundary conditions through the definition of the bending moment. Moreover, the influences of the electro-mechanic, magneto-mechanic and electromagnetic coupling on the stiffness of the bimorph stem from the computation of the beam equivalent stiffness constants. Free and forced vibration analyses of both multiphase and laminated magneto-electro-elastic composite beams are carried out to check the effectiveness and reliability of the proposed analytic solution

Automatic Generation of Failure Scenarios for SoC

International audienceAs process technology downscales, testing difficulties and susceptibility of circuits to random hardware faults arise. This trend, combined with increasing complexity of functions to be performed by Systems-on-Chip, poses crucial concerns when system engineers have to quantify the dependability achieved by their SoC design. In this paper we propose an extension of the existing approaches to the fault analysis of SoCs describing (1) an algorithm for the automatic generation of failure scenarios based on Bounded Model Checking (BMC) (2) a methodology and Simulink-based tool for the automatic execution of SoC safety analysis and (3) an application of the proposed analysis flow to a concrete SoC use case

Violencia urbana al fin del milenio el caso Pereira 1990 - 2000

Trabajo pionero a nivel regional y nacional en geo-temporización de la violencia homicida en una ciudad intermedia de Colombia en una de las épocas más violentas de su historia (Narcotráfico). Interpretaciones acerca de la violencia urbana

Computational Analysis of the Active Control of Incompressible Airfoil Flutter Vibration Using a Piezoelectric V-Stack Actuator

The flutter phenomenon is a potentially destructive aeroelastic vibration studied for the design of aircraft structures as it limits the flight envelope of the aircraft. The aim of this work is to propose a heuristic design of a piezoelectric actuator-based controller for flutter vibration suppression in order to extend the allowable speed range of the structure. Based on the numerical model of a three degrees of freedom (3DOF) airfoil and taking into account the FEM model of a V-stack piezoelectric actuator, a filtered PID controller is tuned using the population decline swarm optimizer PDSO algorithm, and gain scheduling (GS) of the controller parameters is used to make the control adaptive in velocity. Numerical simulations are discussed to study the performance of the controller in the presence of external disturbances

Edible wild mushrooms: exotic species of Suillus (Boletales, Basidiomycota) and Lactarius (Russulales, Basidiomycota) associated to culture of Pinus elliottii in northeastern Argentina

Los hongos silvestres comestibles son un recurso económico importante permitiendo obtener un producto deshidratado que puede comercializarse fácilmente sin problemas como con los que existen con los hongos frescos que rápidamente se deterioran al tener una vida postcosecha corta. En el presente trabajo, y con el objeto de dar a conocer este recurso, se ilustran y describen dos especies de hongos micorrícicos asociadas a cultivos de Pinus elliotii en el nordeste argentino no antes mencionadas para la región. Se citan por primera vez a Lactarius deliciosus para la provincia de Misiones y a Suillus granulatus para las provincias de Corrientes y Misiones.Wild edible mushrooms are a promising economic resource, since they are easily commercialized as a dehydrated product. In the present work, two species of mycorrhizal fungus associated to Pinus elliottii, cultivated in the NE of Argentina, are described and illustrated. Lactarius deliciosus is a new record from Misiones province whereas Suillus granulatus is a new record from provinces of Corrientes and MisionesFil: Niveiro, Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Botánica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botánica del Nordeste; ArgentinaFil: Popoff, Orlando Fabian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Botánica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botánica del Nordeste; ArgentinaFil: Alberto, Edgardo Omar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Biotecnológicas. Instituto de Investigaciones Biotecnológicas ; Argentin

Disasters management

The thesis discusses the issues and the problems that are related to the disasters, with a particular attention to the management of these events and the behavior of the people that are affected by them. This work is made because the world has to face the changes in the environment, the pollution and in its social structure but is it ready to do it? Is there a correct level of resilience and preparedness to preserve our system? A flow in Asia had a zero effect on the economies around the globe, one hundred years ago, but now can be reason of food scarcity and drastic economic losses so the globalization changed the effects of the events: the economies are now integrated and a big catastrophe could cause a wide destabilization very easily. However, this thesis doesn't want to give to the disasters management new solutions, model to calculate the damages or to manage the situations; it wants to define what are the particularities that interact into a disaster and what is their risk. This thesis also accomplish the role to unify various subjects of study in order to understand how the field needs various approaches to be accomplished. At least the thesis would also give some basic knowledge and an introduction to the disaster management. The first chapter introduce the topic of the disasters, giving to the reader a landscape of the different definitions, how they are elaborated, the typologies of disasters and the perception that the people and the market have about them. This chapter is made to show the increase in the number of the events and of the side effects, such as how the cost of the disasters have reached, in the last eighteen years, around two thousand and a half billions of US dollars. The second chapter is concentrate on the analysis of the disasters, defining the different typologies of the damages, how they influence the environment (physical and economic) and how people will be affected by the disaster in their behavior. It was done a particularly careful analysis of various study about the human behavior and the reader can understand how it will influence the management of the post-event crisis, with particular attention to the resource management. In this chapter is also possible to read about how to evaluate the risk and the effective damages that any event can create, then there is the analysis of the effect of the Japan earthquake of 2011. The third chapter will give to the reader an analysis of how the recovery have to be planned and implemented after the disasters. The chapter is concentrate on the timing and the actions that have to be actuated in every step of the recovery, with a particular attention to the part about the recovery policy, that has to be implemented considering some precise details of the territory. The fourth, and last, chapter is about the possible interactions between the states and the insurance market. These interactions should be improved to alleviate the financial damages due to the disasters applying preventive insurance policies. The analysis is made in three parts: an approach to the theory of the costs for the insurances (due to extraordinary events), an approach to the game theory that interface the interactions between more actors in long term games placed to reduce risk and costs and a last part with some clue about how to improve this kind of system