Search results for "dam"

Political Extremism and Rationality

2002

Political extremism is widely considered to be the product of irrational behavior. Originally published in 2002, the distinguishing feature of this collection by well-known economists and political scientists from North America, Europe and Australia is to propose a variety of explanations which all insist on the rationality of extremism. Contributors use variants of this approach to shed light on subjects such as the conditions under which democratic parties take extremist positions, the relationship between extremism and conformism, the strategies adopted by revolutionary movements, and the reasons why extremism often leads to violence. The authors identify four core issues in the study of…

Diritti, sicurezza, solidarietà e responsabilità nella protezione della persona migrante

2018

1. Uno sguardo d’insieme. 2. Dopo Lisbona: le competenze dell’UE e la Carta dei diritti dinanzi alle crisi migratorie e all’onda lunga del populismo. 3. Protezione della persona migrante, Costituzione e decretazione di urgenza. 4. Solidarietà e diritti nella prospettiva costituzionale: uguaglianza, bisogni primari e contenuto essenziale

El pobre de la familia

2001

Los últimos 35 días

1997

Consumption patterns, development and growth: Adam Smith, David Ricardo and Thomas Robert Malthus

2003

In this paper we combine the classical analysis of luxury consumption with the classical theories of development and growth. We also focus on the role played, within classical economics, by institutional factors such as the structure of property rights and contractual arrangements in determining consumption patterns and investment in agriculture. In particular, we show that Ricardo's and Malthus' different views on the role of consumption expenditure in promoting growth depend on Ricardo's acceptance (Malthus' refusal) of Say's law of markets and on Ricardo's exclusion (Malthus' inclusion) of a non-commodity option such as leisure from (in) the range of available consumption alternatives.

mplicit Identification of Contact Parameters in a Continuous Chain Model

2011

Accurate contact modeling is of great importance in the field of dynamic chain simulations. In this paper emphasis is on contact dynamics for a time-domain simulation model of large chains guided in a closed loop track. The chain model is based on theory for unconstrained rigid multibody dynamics where contact within the chain and with the track is defined through continuous point contacts using the contact indentation and rate as means. This paper presents an implicit method to determine contact parameters of the chain model through the use of none gradient optimization methods. The set of model parameters are estimated by minimizing the residual between simulated and measured results. The…

Ceļš: Latvijas Universitātes Teoloģijas fakultātes teoloģisks, reliģijpētniecisks un kultūrvēsturisks izdevums, Nr. 65

2015

A symmetric nonlocal damage theory

2003

The paper presents a thermodynamically consistent formulation for nonlocal damage models. Nonlocal models have been recognized as a theoretically clean and computationally efficient approach to overcome the shortcomings arising in continuum media with softening. The main features of the presented formulation are: (i) relations derived by the free energy potential fully complying with nonlocal thermodynamic principles; (ii) nonlocal integral operator which is self-adjoint at every point of the solid, including zones near to the solid's boundary; (iii) capacity of regularizing the softening ill-posed continuum problem, restoring a meaningful nonlocal boundary value problem. In the present app…

Optimal damping coefficient for a class of continuous contact models

2020

AbstractIn this study, we develop an analytical formula to approximate the damping coefficient as a function of the coefficient of restitution for a class of continuous contact models. The contact force is generated by a logical point-to-point force element consisting of a linear damper connected in parallel to a spring with Hertz force–penetration characteristic, while the exponent of deformation of the Hertz spring can vary between one and two. In this nonlinear model, it is assumed that the bodies start to separate when the contact force becomes zero. After separation, either the restitution continues or a permanent penetration is achieved. Therefore, this model is capable of addressing …

Power System Oscillations with Different Prevalence of Grid-Following and Grid-Forming Converters

2022

The oscillatory behaviour of the power system is an aspect that is significantly affected by the increasing integration of converter-based generation sources. Several works address the impact of non-synchronous generation on the operation of the system from different points of view, but only a few studies focus on power-frequency oscillations with a prevalence of generation sources interfaced through power electronics. A lack of research can be found in particular in the comparative analysis of the two main control strategies for power converters, namely grid-following and grid-forming. The article aims to contribute to this direction, starting from a theoretical analysis of the two control…