Search results for " mani"

Le dinamiche del terziario nei Paesi europei: una riflessione sulla base dei dati ufficiali

2009

La maggiore rilevanza assunta dal settore terziario, in concomitanza ad un costante processo di deindustrializzazione, ci ha indotto ad analizzare il fenomeno la cui evoluzione è fortemente legata ai cambiamenti che negli ultimi decenni hanno caratterizzato la struttura produttiva dei sistemi economici più avanzati. Dopo una breve considerazione delle differenti teorie formulate in anni recenti, il presente lavoro esamina, sia a livello globale che con un maggiore dettaglio, le dinamiche della terziarizzazione nell’ambito dell’EU13 per il decennio 1996-2005. A questo scopo si è fatto ricorso ai dati EUROSTAT, riguardanti il manifatturiero e un sub-insieme del terziario privato, derivandone …

Can Euribor be fixed?

2020

The manipulation of Euro Interbank Offered Rate (Euribor) is a problem with great impact on international financial markets. This paper focuses on two aspects of the Euribor benchmark rate for the period 2004–2018: the specific features that make the Index more vulnerable to manipulation and the potential for Index manipulation over the studied period. To address the first aspect, we examine the range and the standard deviation of daily quotes, as well as the panel banks’ quote submissions to the Euribor administrator, the maximum and minimum quotes and the daily variation of submissions. As a result, we found a group of five banks with similar and extreme submission patterns, which might b…

El programa iconográfico de Manini y Monteiro para los jardines de la Quinta da Regaleira (parte I)

2015

Least energy solutions to the Dirichlet problem for the equation −D(u) = f (x, u)

2017

Let be a bounded smooth domain in RN. We prove a general existence result of least energy solutions and least energy nodal ones for the problem −u = f(x, u) in u = 0 on ∂ (P) where f is a Carathéodory function. Our result includes some previous results related to special cases of f . Finally, we propose some open questions concerning the global minima of the restriction on the Nehari manifold of the energy functional associated with (P) when the nonlinearity is of the type f(x, u) = λ|u| s−2u − μ|u| r−2u, with s, r ∈ (1, 2) and λ,μ > 0.

Unit Vector Fields that are Critical Points of the Volume and of the Energy: Characterization and Examples

2007

In the last few years, many works have appeared containing examples and general results on harmonicity and minimality of vector fields in different geometrical situations. This survey will be devoted to describe many of the known examples, as well as the general results from where they are obtained.

An adaptive control law for robotic manipulator without velocity feedback

2003

In this paper, a new adaptive control law is designed for robotic manipulators, based on the use of reference velocities instead of the actual ones and feedback signals generated from position errors. The law in question is suitable for trajectory tracking and positioning tasks. Its peculiarities are implementation without velocity measurements and estimation, high signal-to-noise ratio in control torques and absence of parameter drift in positioning tasks. Experimental tests are shown with the aim to confirm the validity of the control law and to illustrate its actual effects on the behaviour of the system.

Design and control of a novel 3D casting manipulator

2010

This paper focuses on casting manipulation and presents an innovative mechanism that allows objects placed in a three-dimensional space to be reached with a relatively small robot. Casting manipulation is a technique by which a robotic end-effector is thrown and its ballistic flight is controlled through a tether cable so as to reach a target object. Previous work presented a solution that is viable only when the position of the target object is perfectly known or aligned with the throwing plane. Our work extends the technique by use of a novel mechanical design of the arm, and a suitable control scheme for the flight of the end-effector, which makes it applicable for objects placed at gene…

A Rough-Terrain Casting Robot for the ESA Lunar Robotics Challenge

2009

This paper describes the design and implementation of DAVID, a lunar vehicle developed for the European Space Agency (ESA) Lunar Robotics Challenge, presenting severe terrain negotiation and sample acquisition challenges. We discuss in some detail two of the main innovative aspects of our entry to the challenge, i.e. the locomotion system and the sample acquisition system. Motivated by the challenge specifications, a range of different locomotion systems were considered, among which we chose a simple, rugged and effective wheeled system. We provide an account of the choice of five different types of wheels, which were designed, analyzed and experimentally tested in conditions similar to the…

Visual-based Feedback Control of Casting Manipulation

2006

In this paper, we present a method to control casting manipulation by means of real-time visual feedback. Casting manipulation is a technique to deploy a robotic end-effector at large distances from the robot’s base, by throwing the end-effector and controlling its ballistic flight using forces transmitted through a light tether connected to the end-effector itself. The tether cable can also be used to retrieve the end-effector and exert forces on the robot’s environment. Previous work has shown that casting manipulation is able to catch objects at a large distance, proving it viable for applications such as sample acquisition and return, rescue, etc. In previous experiments, the position o…

FE Calculation Methodology for the Thermodynamic Fatigue Analysis of an Engine Component

2006

Thermo mechanical fatigue problem is treated to define an analysis methodology permitting the strength evaluation by reliability viewpoint. The main difficulty is the lack of both theoretical and experimental information; consequently the problem is treated verifying continually the validity and the limits of the developing solution method. The main task of the activity described in this paper was the development of a numerical methodology, based on FE analyses, for the evaluation of the structural behavior of engine components subjected to thermo mechanical fatigue phenomena. The chosen application was the exhaust manifold of an IC engine; FE analyses were executed following the standard m…