Impact of an online parenting support programme on children’s quality of life

The study aims to describe the parental use of an online parenting support programme, the ‘Open Window to Family’ (JAF) and to evaluate its impact on perceived children’s quality of life (QoL). This programme makes online resources available to support positive parenting. The study included 363 parents (nintervention group = 142) who completed measures to evaluate their children’s QoL. The results suggest that using the programme for a longer time and accessing more information/services are positively related to the perception of utility but not to the frequency of use. The programme proved to be more useful for specific difficulties and to search for specific information. We found high levels of parental perception of children’s well-being, both physical and psychological, and lower values in social support and relationships with peers. No differences were observed between the total QoL of children in the intervention group and control group. The differences in the dimensions of QoL are due to interaction with the level of education of the mother: mothers with higher education reported higher physical well-being, social support, relationships with peers, and school context. Guidelines are suggested to enhance the accessibility of this type of programme as well as enhance its impact on parents and children.info:eu-repo/semantics/publishedVersio

Voltage Unbalance, Power Factor and Losses Optimization in Electrified Railways Using an Electronic Balancer

Unbalanced currents, low power factor and high losses contribute to increasing the bill infrastructure managers must pay to the TSO/DSO operator that supplies electric energy to the railway system. Additionally, if regenerative energy coming from braking regimes is not allowed to be injected into the grid or even is penalized when it occurs, then the optimization of those parameters must be pursued. One of the possible measures that can be taken to counteract those phenomena is the installation of electronic balancers in heavy loaded substations in order to optimize the interface to the three-phase electric grid. This paper shows the benefit of such use taking examples from real conditions and realistic simulations assumed equivalent to field measurements

Bidirectional DC-DC converter with high frequency isolation for V2G applications

This paper presents the topological solution of dual active bridge (DAB) with phase shift control for a bidirectional DC-DC converter. This converter typically integrates systems for vehicle to grid (V2G) and vehicle to grid (G2V) applications. About DAB topology are illustrated the key aspects of its operation also the condition of zero voltage switch (ZVS). Experimental results allow to validate their correct operation in applications of V2G and G2V, bidirectional transit of energy

Push-Pull DC-DC Converter with Planar Transformer for PV Application

There is a trend toward increasing the performance of power electronics converters used in photovoltaic systems. This paper presents the design and implementation of Push-Pull DC-DC converter. This converter typically integrates systems for photovoltaic (PV) applications. Is also presented the design of the high frequency planar transformer, which presents several advantages in relation to conventional transformer

Dynamic Performance of Voltage Oriented Control Method Applied in a Voltage Source Converter

The work focus the design of a Voltage Oriented Control method applied to a grid connected Voltage Source Converter. The laboratory implementation results show fast response time with small deviation under strong perturbations

Cost estimation of rail power conditioner topologies based on indirect modular multilevel converter in v/v and scott power transformers

This paper presents a cost estimation study for several rail power conditioner (RPC) topologies based on an indirect modular multilevel converter (MMC), in which these topologies are combined with V/V or Scott power transformers. The RPC topologies under interest in this paper are: the RPC based on a full-bridge MMC (RPC based on MMC4), the RPC based on two-phase three-wire MMC (RPC based on MMC3), and the RPC based on a half-bridge MMC (RPC based on MMC2). These RPC systems operate at medium voltage levels in the interconnection to 25 kV-50 Hz catenary sections to solve power quality problems, such as the current harmonics and the negative sequence components (NSCs) of currents. Along the paper are described the V/V and the Scott power transformers, the RPC main architectures, and the estimated cost of implementation for each RPC topology considering V/V or Scott implementations. As main contribution, the presented results could help in the selection procedure of the RPC topology, giving the best economical solution according to the used power transformer (V/V or Scott).This work has been supported by FCT – Fundação para a Ciência e Tecnologia within the Project Scope: UID/CEC/00319/2019. This work has been supported by FCT within the Project Scope DAIPESEV – Development of Advanced Integrated Power Electronic Systems for Electric Vehicles: PTDC/EEI-EEE/30382/2017. Mohamed Tanta is supported by the doctoral scholarship with a reference PD/BD/127815/2016 granted by the Portuguese FCT agency

A novel hardware protection scheme for a modular multilevel converter half-bridge submodule

The Modular Multilevel Converter (MMC) has become progressively an attractive solution for the medium-power and the high-power applications, due to its modularity, flexibility of redundancy or scalability, high efficiency and low production of harmonic contents. However, in order to have a reliable and robust MMC system, different concerns should be observed in terms of the converter control complexity and the required effective protection system. In this context, this paper presents a novel hardware protection topology for the MMC half-bridge submodule. The introduced scheme is based on new sensors technology that can be assembled near the power hardware, resulting in less perturbation and a very low signal delay. This allows the protection system to respond quickly to fault situations. The proposed protection scheme of half-bridge MMC submodules is a new contribution given the steadily increasing popularity of the MMC and that just a few scientific publications treat in detail the protection mechanisms of half-bridge submodules for MMC. The experimental results confirm the effectiveness of the proposed scheme after creating the fault overvoltage and overcurrent conditions on one MMC half-bridge submodule.This work has been supported by national funds through FCT – Fundação para a Ciência e Tecnologia within the Project Scope: UID/CEC/00319/2019. This work has been supported by FCT Project DAIPESEV PTDC/EEI-EEE/30382/2017 and by the ERDF – European Regional Development Fund through the Operational Programme for Competitiveness and Internationalisation – COMPETE 2020 Programme, and by National Funds through the Portuguese funding agency, FCT, within project SAICTPAC/0004/2015 – POCI –01–0145–FEDER–016434. Mohamed Tanta was supported by FCT PhD grant with a reference PD/BD/127815/2016

Organizational and Methodological Influence of Risk Management in Projects

Project risk management is essential to managers’ decision making and business success, because it allows the manager to identify, analyse  and  decide  on the most appropriate way to respond to different adversities that may arise during the development of new products, services, processes, projects, continuous improvement, etc. This requires a mind-set that risks have a major influence on the bottom line and use analytical methods or risk management software. It is essential to integrate the entire organizational structure into risk mitigation intervention. The purpose of this paper is to address some of the important topics to consider for well implemented and successful risk management. An approach is taken at both organizational and methodological levels. Keywords: Risk management, PMBOK, Stakeholders, Methods, New product developmen

PROPOSAL FOR A COMPREHENSIVE AND INTEGRATED MODEL OF SUPPORT FOR THE DEVELOPMENT OF NEW PRODUCTS

The development of new products (NPD) is crucial for the existence of companies, source of competitive advantage and determinant of their business success. Several factors, both operational and organizational or even strategic, contribute to the innovation process that supports NPD. The holistic assessment of all these factors as a whole has not been the subject of research leading to the proposal for an integrated and systemic model. In this way, this article aims to propose a comprehensive conceptual model that integrates the strategic, organizational and procedural levels, as well as the set of factors to be taken into account in NPD projects. Based on the literature review, a comprehensive and integrated conceptual model of NPD support (MAIDNP) is deductive-inductive. This model can therefore be a tool for evaluating processes, projects and products, dedicated to companies that innovate, design and develop new products