A Review on the Characterization of Signals and Systems by Power Law Distributions

Power laws, also known as Pareto-like laws or Zipf-like laws, are commonly used to explain a variety of real world distinct phenomena, often described merely by the produced signals. In this paper, we study twelve cases, namely worldwide technological accidents, the annual revenue of America׳s largest private companies, the number of inhabitants in America׳s largest cities, the magnitude of earthquakes with minimum moment magnitude equal to 4, the total burned area in forest fires occurred in Portugal, the net worth of the richer people in America, the frequency of occurrence of words in the novel Ulysses, by James Joyce, the total number of deaths in worldwide terrorist attacks, the number of linking root domains of the top internet domains, the number of linking root domains of the top internet pages, the total number of human victims of tornadoes occurred in the U.S., and the number of inhabitants in the 60 most populated countries. The results demonstrate the emergence of statistical characteristics, very close to a power law behavior. Furthermore, the parametric characterization reveals complex relationships present at higher level of description.

Power Law Behavior and Self-similarity in Modern Industrial Accidents

Advances in technology have produced more and more intricate industrial systems, such as nuclear power plants, chemical centers and petroleum platforms. Such complex plants exhibit multiple interactions among smaller units and human operators, rising potentially disastrous failure, which can propagate across subsystem boundaries. This paper analyzes industrial accident data-series in the perspective of statistical physics and dynamical systems. Global data is collected from the Emergency Events Database (EM-DAT) during the time period from year 1903 up to 2012. The statistical distributions of the number of fatalities caused by industrial accidents reveal Power Law (PL) behavior. We analyze the evolution of the PL parameters over time and observe a remarkable increment in the PL exponent during the last years. PL behavior allows prediction by extrapolation over a wide range of scales. In a complementary line of thought, we compare the data using appropriate indices and use different visualization techniques to correlate and to extract relationships among industrial accident events. This study contributes to better understand the complexity of modern industrial accidents and their ruling principles.

Cohesive law estimation of adhesive joints in mode II condition

The adhesive bonding technique enables both weight and complexity reduction in structures that require some joining technique to be used on account of fabrication/component shape issues. Because of this, adhesive bonding is also one of the main repair methods for metal and composite structures by the strap and scarf configurations. The availability of strength prediction techniques for adhesive joints is essential for their generalized application and it can rely on different approaches, such as mechanics of materials, conventional fracture mechanics or damage mechanics. These two last techniques depend on the measurement of the fracture toughness (GC) of materials. Within the framework of damage mechanics, a valid option is the use of Cohesive Zone Modelling (CZM) coupled with Finite Element (FE) analyses. In this work, CZM laws for adhesive joints considering three adhesives with varying ductility were estimated. The End-Notched Flexure (ENF) test geometry was selected based on overall test simplicity and results accuracy. The adhesives Araldite® AV138, Araldite® 2015 and Sikaforce® 7752 were studied between high-strength aluminium adherends. Estimation of the CZM laws was carried out by an inverse methodology based on a curve fitting procedure, which enabled a precise estimation of the adhesive joints’ behaviour. The work allowed to conclude that a unique set of shear fracture toughness (GIIC) and shear cohesive strength (ts0) exists for each specimen that accurately reproduces the adhesive layer’ behaviour. With this information, the accurate strength prediction of adhesive joints in shear is made possible by CZM.

Dicionários e estudos linguísticos do português medieval. Um projecto de equipa

O tema destes Encontros Literdisciplinares da FCSH-UNL - A Ciência na Universidade - sugere que seja feito o enquadramento, embora muito resumidamente, da investigação que vou apresentar na unidade de investigação em que vem sendo desenvolvida - o Centro de Lingüística da Universidade Nova de Lisboa - CLUNL. A entrada da Lingüística na Universidade Nova tem uma história quase tão longa como a própria instituição, e o actual Centro de Lingüística resulta da restruturação recente do Centro de Estudos Comparados de Línguas e Literaturas Modemas, criado por decisão do Senado da Universidade com o apoio da então Junta Nacional de Investigação Científica e Tecnológica - JNICT, pouco tempo apôs a criação, em 1977, da Faculdade de Ciências Sociais e Humanas da Universidade Nova de Lisboa. No seu início, pretendia-se que o Centro reunisse a investigação literária e lingüística dos docentes do Departamento de Línguas e Literaturas Modemas existente na altura, o qual reunia as línguas românicas e germânicas, as literaturas e a lingüística. Porém, do mesmo modo que o Departamento se dividiu em cinco, do Centro foram saindo vários grupos ao longo dos anos, até que, há apenas um ano, se concretizou a separação do gmpo de Lingüística do gmpo que restava das Literaturas, dando origem ao Centro de Lingüística e a dois outros Centros de Literatura, um de Estudos Anglo-Portugueses e o outro de Estudos Portugueses.

A estrada de Beira: reconstituição de um traçado medieval

Dissertação de mestrado em História, especialização em História Medieval

Contract law

Livro editado para celebrar dos 10 anos da Faculdade de Direito da UNL

Le vert et le rouge: a study on the materials, techniques and meaning of the green and red colours in medieval portuguese illuminations

Dissertação para obtenção do Grau de Doutor em Conservação e Restauro

Obama's law : analysis of a breakthrough law on healthcare access and lessons for the Portuguese health system management

ABSTRACT - The Patient Protection and Affordable Care Act shook the foundations of the US health system, offering all Americans access to health care by changing the way the health insurance industry works. As President Obama signed the Act on 23 March 2010, he said that it stood for “the core principle that everybody should have some basic security when it comes to their health care”. Unlike the U.S., the Article 64 of the Portuguese Constitution provides, since 1976, the right to universal access to health care. However, facing a severe economic crisis, Portugal has, under the supervision of the Troika, a tight schedule to implement measures to improve the efficiency of the National Health Service. Both countries are therefore despite their different situation, in a conjuncture of reform and the use of new health management measures. The present work, using a qualitative research methodology examines the Affordable Care Act in order to describe its principles and enforcement mechanisms. In order to describe the reality in Portugal, the Portuguese health system and the measures imposed by Troika are also analyzed. The intention of this entire analysis is not only to disclose the innovative U.S. law, but to find some innovative measures that could serve health management in Portugal. Essentially we identified the Exchanges and Wellness Programs, described throughout this work, leaving also the idea of the possibility of using them in the Portuguese national health system.

2008 Portuguese tobacco law: What are the effects on smoking rates?

A Work Project, presented as part of the requirements for the Award of a Masters Degree in Economics from the NOVA – School of Business and Economics

No encalço do passo do Homem medieval: as vias de comunicação do antigo termo e atual concelho de Tomar

Dissertação apresentada para cumprimento dos requisitos necessários à obtenção do grau de Mestre em Arqueologia

O Género Feminino em Discussão Re-presentações da mulher na arte tumular medieval portuguesa: projectos, processos e materializações

Tese apresentada para cumprimento dos requisitos necessários à obtenção do grau de Doutor em História da Arte

Troia Roman baths (Portugal) – Assessment of history of interventions

International Seminar in Conservation. A Tribute to Cesari Brandi. Lisboa, LNEC, May 2006, p.273-282

Le plurilinguisme dans le roman portugais contemporain (1963- 1983): caractéristiques, configurations linguistiques et énonciatives

THÈSE pour l’obtention du grade de DOCTEUR

Growth and unemployment: understanding Okun's law for Portugal

A Work Project, presented as part of the requirements for the Award of a Masters Degree in Economics from the NOVA – School of Business and Economics

A ocupação Alto-Medieval do povoado do Porto Torrão (Ferreira do Alentejo)

Dissertação apresentada para cumprimento dos requisitos necessários à obtenção do grau de Mestre em Arqueologia