Experiments on stress-triaxiality dependence of material behavior of aluminum alloys

The paper presents and discusses experimental procedures, visual observations and test results considered important to obtain data that can be used in validation of constitutive relations and failure criteria. The aim is to investigate the combined effects of stress intensity, stress-triaxiality and Lode parameter on the material response and failure behavior of aluminum alloys. Smooth and pre-notched tensile and shear specimens were manufactured from both very thin sheets and thicker plates to cover a wide range of stress triaxialities and Lode parameters. In addition, modified Arcan specimens were designed allowing investigation of the effect of sudden changes in stress states and deformation modes on the material behavior. (C) 2009 Elsevier Ltd. All rights reserved.

A ductile damage criterion at various stress triaxialities

The paper discusses the effect of stress triaxiality on the onset and evolution of damage in ductile metals. A series of tests including shear tests and experiments oil smooth and pre-notched tension specimens wits carried Out for it wide range of stress triaxialities. The underlying continuum damage model is based oil kinematic definition of damage tensors. The modular structure of the approach is accomplished by the decomposition of strain rates into elastic, plastic and damage parts. Free energy functions with respect to fictitious undamaged configurations as well as damaged ones are introduced separately leading to elastic material laws which are affected by increasing damage. In addition, a macroscopic yield condition and a flow rule are used to adequately describe the plastic behavior. Numerical simulations of the experiments are performed and good correlation of tests and numerical results is achieved. Based oil experimental and numerical data the damage criterion formulated in stress space is quantified. Different branches of this function are taken into account corresponding to different damage modes depending oil stress triaxiality and Lode parameter. In addition, identification of material parameters is discussed ill detail. (C) 2007 Elsevier Ltd. All rights reserved.

Failure assessments of corroded pipelines with axial defects using stress-based criteria: Numerical studies and verification analyses

Conventional procedures used to assess the integrity of corroded piping systems with axial defects generally employ simplified failure criteria based upon a plastic collapse failure mechanism incorporating the tensile properties of the pipe material. These methods establish acceptance criteria for defects based on limited experimental data for low strength structural steels which do not necessarily address specific requirements for the high grade steels currently used. For these cases, failure assessments may be overly conservative or provide significant scatter in their predictions, which lead to unnecessary repair or replacement of in-service pipelines. Motivated by these observations, this study examines the applicability of a stress-based criterion based upon plastic instability analysis to predict the failure pressure of corroded pipelines with axial defects. A central focus is to gain additional insight into effects of defect geometry and material properties on the attainment of a local limit load to support the development of stress-based burst strength criteria. The work provides an extensive body of results which lend further support to adopt failure criteria for corroded pipelines based upon ligament instability analyses. A verification study conducted on burst testing of large-diameter pipe specimens with different defect length shows the effectiveness of a stress-based criterion using local ligament instability in burst pressure predictions, even though the adopted burst criterion exhibits a potential dependence on defect geometry and possibly on material`s strain hardening capacity. Overall, the results presented here suggests that use of stress-based criteria based upon plastic instability analysis of the defect ligament is a valid engineering tool for integrity assessments of pipelines with axial corroded defects. (C) 2008 Elsevier Ltd. All rights reserved.

Non-linear modal analysis for beams subjected to axial loads: Analytical and finite-element solutions

A rigorous derivation of non-linear equations governing the dynamics of an axially loaded beam is given with a clear focus to develop robust low-dimensional models. Two important loading scenarios were considered, where a structure is subjected to a uniformly distributed axial and a thrust force. These loads are to mimic the main forces acting on an offshore riser, for which an analytical methodology has been developed and applied. In particular, non-linear normal modes (NNMs) and non-linear multi-modes (NMMs) have been constructed by using the method of multiple scales. This is to effectively analyse the transversal vibration responses by monitoring the modal responses and mode interactions. The developed analytical models have been crosschecked against the results from FEM simulation. The FEM model having 26 elements and 77 degrees-of-freedom gave similar results as the low-dimensional (one degree-of-freedom) non-linear oscillator, which was developed by constructing a so-called invariant manifold. The comparisons of the dynamical responses were made in terms of time histories, phase portraits and mode shapes. (C) 2008 Elsevier Ltd. All rights reserved.

Effects of accentuated and reversed curve of Spee on apical root resorption

Introduction: In this study, we evaluated the influence of intrusion mechanics with accentuated and reversed curve of Spee on root resorption of the maxillary and mandibular incisors. Methods: A sample of 60 patients with Class I and Class II Division 1 malocclusions having nonextraction treatment was divided into 2 groups with the following characteristics: group 1 comprised 30 deepbite patients, treated with accentuated and reversed curve of Spee intrusion mechanics, with an initial mean age of 12.8 +/- 1.23 years (range, 10.01-15.32 years), and group 2 comprised 30 patients with normal overbite treated without intrusion mechanics, with an initial mean age of 12.87 +/- 1.43 years ( range, 10.02-15.36 years). Pretreatment and posttreatment periapical radiographs were used to evaluate root resorption. The groups were compared by using the Mann-Whitney U test. Correlation between root resorption and tooth movement was investigated with the Spearman correlation coefficient. Results: The deepbite group treated with accentuated and reversed curve of Spee had statistically greater root resorption ( 1.87) than the normal overbite group ( 1.54), at P=.017. Changes in overbite and vertical displacements of the maxillary central incisor apices had significant correlations to root resorption ( r = 0.30, P =.019; r = 0.27, P =.037, respectively). Conclusions: Accentuating and reversing the curve of Spee in the archwires to correct deep overbite causes more root resorption than nonintrusive mechanics.

Childhood neglect and cognitive development in extremely low birth weight infants: A prospective study

Objective. To examine the relationship between child maltreatment and cognitive development in extremely low birth weight infants, adjusting for perinatal and parental risk factors. Methods. A total of 352 infants with birth weight of

Lições de Direito e Processo Penal, 2012/2013

§ Parte I A: DIREITO PENAL: CAPÍTULO I – CONCEITO DE DIREITO PENAL, COM ESPECIAL RELEVO DA DIFERENCIAÇÃO ENTRE DIREITO PENAL CLÁSSICO, DIREITO PENAL ECONÓMICO E SOCIAL E DIREITO DAS CONTRA-ORDENAÇÕES; CAPÍTULO II – O PROBLEMA DOS FINS DAS PENAS; CAPÍTULO III – BREVE ABORDAGEM DA EVOLUÇÃO HISTÓRICA DO DIREITO PENAL; CAPÍTULO IV – TEORIA GERAL DA LEI CRIMINAL; CAPÍTULO V – TEORIA GERAL DA INFRACÇÃO CRIMINAL: A) ELEMENTOS; B) CONSTRUÇÕES; C) ANÁLISE: 1) ACÇÃO; 2) TIPICIDADE; 3) ILICITUDE; 4) CULPA; 5) PUNIBILIDADE; CAPÍTULO VI – FORMAS DO CRIME:A) TENTATIVA; B) AUTORIA E COMPARTICIPAÇÃO; C) CONCURSO DE CRIMES § Parte I BDIREITO PROCESSUAL PENAL; CAPÍTULO I – A DELIMITAÇÃO DO DIREITO PROCESSUAL PENAL; CAPÍTULO II – OS PRINCÍPIOS FUNDAMENTAIS DO PROCESSO PENAL; CAPÍTULO III - A LEI PROCESSUAL PENAL E A SUA APLICAÇÃO; Parte II: CAPÍTULO I- OS SUJEITOS DO PROCESSO; CAPÍTULO II - O OBJECTO DO PROCESSO; CAPÍTULO III - AS MEDIDAS DE COACÇÃO E DE GARANTIA PATRIMONIAL; CAPÍTULO IV - TRAMITAÇÃO PROCESSUAL PENAL. § § Part I: CRIMINAL LAW: CHAPTER I - CONCEPT OF CRIMINAL LAW, WITH SPECIAL RELIEF OF THE DIFFERENTIATION BETWEEN CLASSIC CRIMINAL LAW, ECONOMIC AND SOCIAL CRIMINAL LAW AND THE “AGAINST ORDINANCES” LAW ("LAW OFFENSES"); CHAPTER II - THE PROBLEM OF THE ENDS OF THE PENALTIES; CHAPTER III - BRIEF OVERVIEW OF THE EVOLUTION HISTORY OF CRIMINAL LAW; CHAPTER IV - GENERAL THEORY OF THE CRIMINAL LAW; CHAPTER V - GENERAL THEORY OF THE CRIMINAL INFRACTION: A) ELEMENTS; B) CONSTRUCTIONS; C) ANALYSIS: 1) ACTION; 2) VAGUENESS DOCTRINE; 3) ILLEGALITY; 4) GUILT (FAULT); 5) PUNISHMENT; CHAPTER VI - FORMS OF THE CRIME: A) ATTEMPT; B) AUTHORSHIP AND "CO-PARTICIPATION"; C) CUMULATION OF OFFENCES. § Part I - B: CRIMINAL PROCEDURAL LAW: CHAPTER I - THE DELIMITATION OF THE CRIMINAL PROCEDURAL LAW; CHAPTER II - THE BASIC PRINCIPLES OF THE CRIMINAL PROCEDURE; CHAPTER III - THE CRIMINAL PROCEDURE LAW AND ITS APPLICATION; Part II: CHAPTER I - THE FIGURES OF THE PROCESS; CHAPTER II - THE OBJECT OF THE PROCESS; CHAPTER III - THE MEASURES OF COERCION AND PATRIMONIAL GUARANTEE (WARRANTY); CHAPTER IV - CRIMINAL PROCEDURE.

Lições de Direito e Processo Penal, 2013/2014

§ Parte I A: DIREITO PENAL: CAPÍTULO I – CONCEITO DE DIREITO PENAL, COM ESPECIAL RELEVO DA DIFERENCIAÇÃO ENTRE DIREITO PENAL CLÁSSICO, DIREITO PENAL ECONÓMICO E SOCIAL E DIREITO DAS CONTRA-ORDENAÇÕES; CAPÍTULO II – O PROBLEMA DOS FINS DAS PENAS; CAPÍTULO III – BREVE ABORDAGEM DA EVOLUÇÃO HISTÓRICA DO DIREITO PENAL; CAPÍTULO IV – TEORIA GERAL DA LEI CRIMINAL; CAPÍTULO V – TEORIA GERAL DA INFRACÇÃO CRIMINAL: A) ELEMENTOS; B) CONSTRUÇÕES; C) ANÁLISE: 1) ACÇÃO; 2) TIPICIDADE; 3) ILICITUDE; 4) CULPA; 5) PUNIBILIDADE; CAPÍTULO VI – FORMAS DO CRIME: A) TENTATIVA; B) AUTORIA E COMPARTICIPAÇÃO; C) CONCURSO DE CRIMES § Parte I B: DIREITO PROCESSUAL PENAL; CAPÍTULO I – A DELIMITAÇÃO DO DIREITO PROCESSUAL PENAL; CAPÍTULO II – OS PRINCÍPIOS FUNDAMENTAIS DO PROCESSO PENAL; CAPÍTULO III - A LEI PROCESSUAL PENAL E A SUA APLICAÇÃO; Parte II: CAPÍTULO I - OS SUJEITOS DO PROCESSO; CAPÍTULO II - O OBJECTO DO PROCESSO; CAPÍTULO III - AS MEDIDAS DE COACÇÃO E DE GARANTIA PATRIMONIAL; CAPÍTULO IV - TRAMITAÇÃO PROCESSUAL PENAL. § § Part I: CRIMINAL LAW: CHAPTER I - CONCEPT OF CRIMINAL LAW, WITH SPECIAL RELIEF OF THE DIFFERENTIATION BETWEEN CLASSIC CRIMINAL LAW, ECONOMIC AND SOCIAL CRIMINAL LAW AND THE “AGAINST ORDINANCES” LAW ("LAW OFFENSES"); CHAPTER II - THE PROBLEM OF THE ENDS OF THE PENALTIES; CHAPTER III - BRIEF OVERVIEW OF THE EVOLUTION HISTORY OF CRIMINAL LAW; CHAPTER IV - GENERAL THEORY OF THE CRIMINAL LAW; CHAPTER V - GENERAL THEORY OF THE CRIMINAL INFRACTION: A) ELEMENTS; B) CONSTRUCTIONS; C) ANALYSIS: 1) ACTION; 2) VAGUENESS DOCTRINE; 3) ILLEGALITY; 4) GUILT (FAULT); 5) PUNISHMENT; CHAPTER VI - FORMS OF THE CRIME: A) ATTEMPT; B) AUTHORSHIP AND "CO-PARTICIPATION"; C) CUMULATION OF OFFENCES. § Part I - B: CRIMINAL PROCEDURAL LAW: CHAPTER I - THE DELIMITATION OF THE CRIMINAL PROCEDURAL LAW; CHAPTER II - THE BASIC PRINCIPLES OF THE CRIMINAL PROCEDURE; CHAPTER III - THE CRIMINAL PROCEDURE LAW AND ITS APPLICATION; Part II: CHAPTER I - THE FIGURES OF THE PROCESS; CHAPTER II - THE OBJECT OF THE PROCESS; CHAPTER III - THE MEASURES OF COERCION AND PATRIMONIAL GUARANTEE (WARRANTY); CHAPTER IV -CRIMINAL PROCEDURE.

Crescer com saúde. Perspectiva dos professores do 1.º ciclo acerca da postura dos alunos e análise postural de crianças com 6 a 7 anos inseridas na comunidade escolar

O presente estudo teve como objectivos conhecer a percepção dos professores do ensino básico acerca da postura corporal dos alunos na sala de aula e analisar a postura de alunos do 1º ano do ensino básico. Este estudo foi realizado numa escola do 1º Ciclo, com 6 professores voluntários e 40 alunos do 1º ano. Na I parte referente ao estudo qualitativo, realizou-se uma discussão por grupo focal, com um roteiro de perguntas que os professores foram discutindo livremente expondo as suas opiniões. Concluiu-se que há por parte dos professores noção de como é a postura corporal dos alunos na sala de aula, como essa postura corporal, pode influenciar de forma, positiva ou negativa o estado de saúde do aluno na sala de aula e comprometer a qualidade de vida dos alunos. Na II parte quantitativa os alunos foram avaliados através do registo fotográfico, num programa de avaliação postural, demonstrando os resultados que na amostra em estudo não foi encontrado desvio vertical significativo entre a cintura escapular e a cintura pélvica. No entanto, foi encontrado desvio horizontal significativo do alinhamento das omoplatas entre si e das espinhas ilíacas postero-superiores entre si, já indicando um início de desvio postural com carácter escoliótico. Conclui-se pois que os alunos avaliados apresentavam problemas posturais com necessidade de serem acompanhados por Fisioterapeutas.

As expressões artísticas no Pré-Escolar e 1º ciclo do Ensino Básico e o desenvolvimento da autonomia e da cooperação

Mestrado, Educação Pré-Escolar e Ensino do 1º Ciclo do Ensino Básico, 20 de Junho de 2013, Universidade dos Açores (Relatório de Estágio).

Rendibilidade da educação e a dimensão das empresas

Dissertação de Mestrado em Ciências Económicas e Empresariais.

Mechanical properties of stent-graft materials

An aneurysm is a localized blood-filled dilatation of an artery whose consequences can be deadly. One of its current treatments is endovascular aneurysm repair, a minimally invasive procedure in which an endoprosthesis, called a stent-graft, is placed transluminally to prevent wall rupture. Early stent-grafts were custom designed for the patient through the assembling of off-the-shelf components by the operating surgeon. However, nowadays, stent-grafts have become a commercial product. The existing endoprostheses differ in several aspects, such as shape design and materials, but they have in common a metallic scaffold with a polymeric covering membrane. This article aims to gather relevant information for those who wish to understand the principles of stent-grafts and even to develop new devices. Hence, a stent-graft classification based on different characteristics is presented and the desired features for an ideal device are pointed out. Additionally, the materials currently in use to fabricate this type of endoprosthesis are reviewed and new materials are suggested.

Robotic manipulators with vibrations: short time fourier transform of fractional spectra

This paper analyzes the signals captured during impacts and vibrations of a mechanical manipulator. In order to acquire and study the signals an experimental setup is implemented. The signals are treated through signal processing tools such as the fast Fourier transform and the short time Fourier transform. The results show that the Fourier spectrum of several signals presents a non integer behavior. The experimental study provides valuable results that can assist in the design of a control system to deal with the unwanted effects of vibrations.

Remote experimentation: integrating research, education, and industrial application

This paper presents a low-cost scaled model of a silo for drying and airing cereal grains. It allows the control and monitor of several parameters associated to the silo's operation, through a remote accessible infrastructure. The scaled model consists of a 2.50 m wide × 2.10 m long plant with all control and monitor capacities provided by micro-Web servers. An application running on the micro-Web servers enables storing all parameters in a data basis for later analysis. The implemented model aims to support a remote experimentation facility for technological education, research-oriented tutorials, and industrial applications. Given the low-cost requirement, this remote facility can be easily replicated in other institutions to support a network of remote labs, which encompasses the concurrent access of several users (e.g. students).

A governação local no Algarve no contexto de financiamento e responsabilidades

Dissertação de mestrado em Gestão Pública, apresentada à secção autónoma de Ciências Sociais, Jurídicas e Políticas da Universidade de Aveiro,sob orientação da Prof. Doutora Maria Luís Rocha Pinto.