Definição e análise dos parâmetros de construção e operação de uma ferramenta de estampagem

O processo de estampagem metálica é dos processos mais utilizados na indústria. Como resultado, qualquer pequeno avanço tecnológico, representa uma enorme melhoria no processo. O processo de estampagem metálica é realizado num curto período de tempo, com forças muito elevadas que promovem deformações elasto-plásticas, endurecimento do material e geração de calor por deformação plástica e também por atrito. Como resultado, muitos problemas podem ocorrer, tais como micro-fissuras, macro-fissuras, engelhamento, defeitos de forma estricções localizadas, fracturas, etc. Quando uma destas falhas ocorre, é importante fazer um diagnóstico das causas do problema. O método de elementos finitos, pode ajudar a fazer uma previsão destes problemas. Os resultados obtidos por este método, são utilizados para se modificarem algumas variáveis do processo, tais como: força do encostador, geometria de punções e matrizes. Neste trabalho foi efectuado um estudo da evolução de uma ferramenta progressiva, recorrendo a um software de elementos finitos (LS-DYNA). O objectivo do estudo da ferramenta progressiva, é o de fazer uma comparação dos resultados obtidos pelo LS-DYNA, com o componente obtido na fase de produção. A ferramenta em estudo passou por três grandes evoluções, tendo sido essencialmente alteradas as geometrias de punções e matrizes. Foi feita uma comparação das espessuras obtidas no processo real, com espessuras obtidas na simulação. Os resultados obtidos na simulação são muito semelhantes ao processo real, com uma margem de erro máximo de 4,08%

LoRaWAN Performance evaluation

The Internet of Things (IoT) is expected to grow in the upcoming years. LoRaWAN is one promising Low Power Wide Area Network (LPWAN) standard proposed for IoT widely adopted across the world. It runs on unlicensed spectrum and was designed to carry sporadic traffic. This dissertation analyses the performance of LoRaWAN in extreme conditions, where peak traffic loads occur in the network. It starts by evaluating the Network Simulator 3 (ns- 3) LoRaWAN module, identifying and correcting their implementation. In a second phase, it evaluates the limitations of the class A LoRaWAN access protocol during synchronized peaks of traffic, and proposes a new access algorithm to improve the reliability and reduce the latency

Couple's relationship and depressive symptoms during the transition to parenthood and Toddler's emotional and behavioral problems

The couple's relationship and mother and father's depressive symptoms during the transition to parenthood were associated with the toddler's emotional and behavioral problems. This study aimed to analyze how the couple's positive and negative interactions and mother and father's depressive symptoms during the transition to parenthood impact toddlers' emotional and behavioral problems. A sample of 95 mothers and fathers (N = 190) were recruited and individually completed questionnaires to assess couples' positive and negative interactions and depressive symptoms during the first trimester of pregnancy and at 3 and 30 months postpartum, and they completed the Child Behavior Checklist 1.5-5 at 30 months postpartum. The path analyses revealed that the couple's postnatal negative interaction partially mediates the impact of the mother's prenatal depressive symptoms on the toddler's internalizing problems at 30 months postpartum. The father's postnatal depressive symptoms and the couple's concurrent positive interaction mediated the impact of the couple's prenatal positive interaction on the toddler's externalizing problems at 30 months postpartum. The screening of the couple's negative interaction and depressive symptoms during pregnancy and the postnatal period can help to identify mothers, fathers, and toddlers at risk for mental health problems.This study was conducted at the Psychology Research Centre (PSI/01662), School of Psychology, University of Minho, and supported by the Foundation for Science and Technology (FCT) through the Portuguese State Budget (UIDB/PSI/01662/2020)

Measures of infant self-regulation during the first year of life: a systematic review

This study aimed to systematically review the measures used to assess infant self-regulation during the first 12 months of life. This systematic review was conducted according to the Preferred Reporting Items for Systematic Reviews and Meta-Analysis statement protocol. From 235 selected papers, 79 provided information on behavioural and physiological measures to assess infant selfregulation during the first 12 months of life. Thirty-six behavioural (30 observational and 6 parent-report) and five physiological different measures were identified. Studies with a longitudinal design, comprising larger samples, and aiming to assess infant self-regulation later in infancy, mostly used behavioural measures than physiological measures. Studies comprising lower samples and aiming to assess infant self-regulation earlier in infancy, mostly used observational than parent-reported measures. Studies targeting younger infants used physiological measures and studies targeting older infants used behavioural measures, with observational measures used with younger infants and parental-reported measures used with older infants during the first year of life. When measuring self-regulation is important to consider infant's age, to fit the measurement procedures with the selfregulation development level.Portuguese Foundation for Science and Technology; Portuguese Ministry of Education and Science; European Regional Development Fund, Grant/Award Number: POCI01-0145-FEDER-007653; Fundação para a Ciência e a tecnologia, Grant/Award Numbers: SFRH/BD/115048/2016, PTDC/ SAU/SAP/116738/2010; Foundation for Science and Technology, Grant/Award Number: UIDB/05380/202

Modeling, control and field tests on an experimental irrigation canal

Irrigation canals are complex hydraulic systems difficult to control. Many models and control strategies have already been developed using linear control theory. In the present study, a PI controller is developed and implemented in a brand new prototype canal and its features evaluated experimentally. The base model relies on the linearized Saint-Venant equations which is compared with a reservoir model to check its accuracy. This technique will prove its capability and versatility in tuning properly a controller for this kind of systems

Proactive services ecosystem framework

Dissertation presented to obtain the degree of Doctor in Electrical and Computer Engineering, specialization on Collaborative Enterprise NetworksCollaborative-Networks (CN) have experienced a fast evolution in the last two decades. The collaboration among independent entities or professionals supported by Information and Communication Technology (ICT) has attracted the research community to establish the conceptual basis for this scientific discipline. Service Orientation has been one of the key selected paradigms for that conceptual basis. Nevertheless, the service concept itself does not have a common understanding in the Business and ICT worlds. In the former, client satisfaction, resources management and business process models are some example concerns, whilst the later deals with interoperability, remote function calling or communication protocols. If for example an enterprise provides some service, it may hire specialists to wrap such service into web-services, expecting to reach worldwide potential new clients. In fact, nowadays Web Services and Service Oriented Architectures (SOA) are the technological elements most commonly used. However, these are passive elements in the sense they do not perform any action towards pursuing business interests, which constitute a limiting factor from a business perspective. Another approach for the above mentioned enterprise is to follow the Multi-Agent Systems (MAS) approach, as the pro-activity is a keyword in such contexts. Nevertheless, as MAS approaches are not so commonly used and not so robust yet, the worldwide potential set of new clients is reduced; which also constitutes an inhibitor factor from the business perspective. This dissertation proposes a Pro-Active Services Ecosystem Framework, gathering inspiration from both the SOA and MAS research areas, trying to bridge the business and ICT worlds through the base concepts for the creation of a Services’ Ecosystem where business services are represented in a pro-active manner towards pursuing business interests, like finding collaboration opportunities or improving the chances each CN member has to see its services selected among competitors, for example. This work also includes a prototype system applied / validated in the area of a Professional Virtual Community of Senior Professionals

“PApi – Pais por Inteiro” Programa de intervenção em grupo para o ajustamento pessoal e a promoção da coparentalidade positiva em pais divorciados

O presente artigo apresenta o programa de intervenção em grupo para pais divorciados, Pais por Inteiro (PApi). Fundamentados na revisão da literatura com a qual o artigo se inicia, os objectivos gerais do programa – promover a coparentalidade positiva, a construção de um projecto de binuclearidade familiar e a reflexão e aprofundamento das trajectórias individuais de cada pai – são descritos, assim como as três macrocomponentes psicoterapêuticas ao longo das quais estes objectivos se desenvolvem – exposição dos processos de divórcio, partilha experiencial e treino de competências e mudança desenvolvimental. O artigo oferece ainda, no final, uma mais detalhada clarificação dos objectivos, materiais e actividades planeadas para cada das dez sessões que compõem o PApi.This article presents the intervention program for divorced parents, Pais por Inteiro (PApi). The main goals of this intervention program, which are supported by the revisited literature in which the article begins, are to promote a positive coparenting style, to help creating a binuclear family project and to help reflect about the interpersonal pathways of each divorced parent. These objectives are described as the three major psychotherapeutic phases, from which these objectives evolve – exposure of the divorce processes, experience sharing and skills training and developmental change. In the end, the present article also offers a detailed clarification of the objectives, materials and activities which were planned for each one of the ten sessions that PApi involves

Examining service quality and social impact perceptions of the 2016 Rio de Janeiro Olympic Games

PurposeThe purpose of this paper is to examine the effects of service quality on perceived positive and negative social impact of the 2016 Rio de Janeiro Olympic Games.Design/methodology/approachA field study was conducted in Rio de Janeiro, and data were collected from residents who attended the Olympic Games through a self-administered questionnaire (n=519). The questionnaire included measures of perceived service quality, positive and negative social impact. A confirmatory factor analysis analysed the psychometric properties of the constructs, and a subsequent structural equation model examined the relationships between service quality and social impact perceptions.FindingsThe results show good psychometric properties of a multidimensional construct of service quality composed of the technical, functional, aesthetic, access, accommodation and complementary events dimensions. The service quality construct was significantly related to both positive social impact (city image and community pride enhancement, social experiences and public infrastructures) and negative social impact (social conflicts and costs) perceptions.Originality/valueThis study contributes to the literature by examining the role of service quality in sport mega-events and testing on different facets of social impact. The findings highlight that social atmosphere and new experiences in the Olympic Games are critical when planning these events.</jats:sec

The Coparenting Relationship Scale—Father’s Prenatal Version

"Published online: 27 June 2018"This study aimed to examine the psychometric characteristics of the Coparenting Relationship Scale when administered in fathers during pregnancy. During the first trimester of a partner’s pregnancy, 91 primiparous fathers completed the Coparenting Relationship Scale—Father’s Prenatal Version (CRS-FPV), and self-report measures of depressive and anxious symptoms, adult attachment, and partner’s relationship quality. The CRS-FPV revealed good internal consistency. Exploratory factor analysis revealed four factors: lack of coparenting support, coparenting conflict, coparenting disagreement, and coparenting undermining. Confirmatory factor analysis revealed a good model fit. Significant associations between the CRSFPV and the original CRS subscales were found. Hypothesized associations between the CRS-FPV subscales and individual (depressive and anxious symptoms and adult attachment) and dyadic (partner’s relationship quality) constructs were also significant. The present study suggested that the CRS-FPV is a reliable multidimensional measure to assess coparenting in fathers during pregnancy.This study was conducted at Psychology Research Centre (UID/PSI/01662/2013), University of Minho, and supported by the Portuguese Foundation for Science and Technology and the Portuguese Ministry of Education and Science through national funds and co-financed by FEDER through COMPETE2020 under the PT2020 Partnership Agreement (POCI-01-0145-FEDER-007653). This study was also supported by FEDER Funds through the Programa Operacional Factores de Competitividade - COMPETE and by National Funds through FCT – Fundação para a Ciência e a Tecnologia under the project PTDC/SAU/SAP/116738/2010.info:eu-repo/semantics/publishedVersio

The baby care scale: a psychometric study with fathers during pregnancy and the postpartum period

The Baby Care Scale (BCS) was designed to assess the involvement of father in infant care during pregnancy and the postpartum period. This study aimed to examine the psychometric characteristics of the BCS - antenatal (BCS-AN) and BCS - postnatal (BCS-PN) versions. A sample of 100 primiparous fathers completed the BCS-AN and/or the BCS-PN and self-reported the measures of anxiety and depressive symptoms and of father-infant emotional involvement during pregnancy and the postpartum period, respectively. Good internal consistency was found for both the BCS-AN and the BCS-PN. A two-factor model was found for both versions of the instrument: (1) household tasks and (2) infant care tasks. The BCS-AN and BCS-PN subscales revealed good internal consistency. Higher scores on the BCS-AN predicted higher scores on the BCS-PN. Significant associations were found among the BCS (BCS-AN and BCS-PN), depressive and anxiety symptoms, and father-infant emotional involvement, revealing good criterion validity. This study suggested that both the BCS-AN and the BCS-PN are reliable multidimensional self-report measures that assess the involvement of father in infant care during pregnancy and the postpartum period.This study was conducted at the Psychology Research Centre (PSI/01662), School of Psychology, University of Minho, and supported by the Foundation for Science and Technology (FCT) through the Portuguese State Budget (UIDB/PSI/01662/2020)