Design and control of parallel three phase voltage source Inverters in low voltage AC microgrid

Design and hierarchical control of three phase parallel Voltage Source Inverters are developed in this paper. The control scheme is based on synchronous reference frame and consists of primary and secondary control levels. The primary control consists of the droop control and the virtual output impedance loops. This control level is designed to share the active and reactive power correctly between the connected VSIs in order to avoid the undesired circulating current and overload of the connected VSIs. The secondary control is designed to clear the magnitude and the frequency deviations caused by the primary control. The control structure is validated through dynamics simulations.The obtained results demonstrate the effectiveness of the control structure

Achieving the Millennium Development Goals in Sub-Saharan Africa : a macroeconomic monitoring framework

The authors present an integrated macroeconomic approach to monitoring progress toward achieving the Millennium Development Goals (MDGs) in Sub-Saharan Africa. At the heart of their approach is a macroeconomic model that captures key linkages between foreign aid, public investment (disaggregated into education, infrastructure, and health), the supply side, and poverty. The model is linked through cross-section regressions to indicators of malnutrition, infant mortality, life expectancy, and access to safe water. A composite MDG indicator is also calculated. The functioning of the framework is illustrated by simulating the impact of an increase in aid and a debt write-off for Niger at the MDG horizon of 2015, under alternative assumptions about the degree of efficiency of public investment. The authors'approach can serve as the building block of Strategy Papers for Human Development (SPAHD), a more encompassing concept than the current"Poverty Reduction"Strategy Papers.Economic Theory&Research,Public Sector Economics&Finance,Inequality,Investment and Investment Climate,Achieving Shared Growth

Envelhecimento populacional: realidade atual e desafios

The aim was to reflect on active aging and the influence of internal and external factors that contribute and even influence the aging process and how Brazil is preparing to face the new reality in relation to significant age group changes and, therefore, change in the general scope. This is a reflective study, with a search in electronic databases that point to population aging. It was evident that there is a great concern in what is discerned about the aging process, without making the necessary decisions so that the health of the individual in the aging process is taken care of as a whole and not partially.Objetivou-se refletir sobre o envelhecimento ativo e a influência de fatores internos e externos que contribuem e até influenciam no processo de envelhecimento e como o Brasil, está se preparando para enfrentar a nova realidade em relação a mudanças significativas de faixa etária e sendo assim, mudança no âmbito geral. Trata-se de estudo de reflexão, com busca nas bases de dados eletrônicas que apontam para o envelhecimento populacional. Evidenciou-se que há uma grande preocupação no que discerne sobre o processo de envelhecer, sem a tomada de decisões necessárias para que a saúde do indivíduo em processo de envelhecimento seja cuidado como um todo e não parcialmente

Envelhecimento populacional: realidade atual e desafios

The aim was to reflect on active aging and the influence of internal and external factors that contribute and even influence the aging process and how Brazil is preparing to face the new reality in relation to significant age group changes and, therefore, change in the general scope. This is a reflective study, with a search in electronic databases that point to population aging. It was evident that there is a great concern in what is discerned about the aging process, without making the necessary decisions so that the health of the individual in the aging process is taken care of as a whole and not partially.Objetivou-se refletir sobre o envelhecimento ativo e a influência de fatores internos e externos que contribuem e até influenciam no processo de envelhecimento e como o Brasil, está se preparando para enfrentar a nova realidade em relação a mudanças significativas de faixa etária e sendo assim, mudança no âmbito geral. Trata-se de estudo de reflexão, com busca nas bases de dados eletrônicas que apontam para o envelhecimento populacional. Evidenciou-se que há uma grande preocupação no que discerne sobre o processo de envelhecer, sem a tomada de decisões necessárias para que a saúde do indivíduo em processo de envelhecimento seja cuidado como um todo e não parcialmente

Preparation of gadolinium-doped ceria barrier layer for intermediate temperature solid oxide fuel cells by spin coating and evaluation of performance degradation by impedance analysis

Thin gadolinium-doped ceria (GDC) films were deposited via the cost-effective aqueous spin coating technique and with rapid one-step sintering at 1200 °C, to be used as barrier layer between a lanthanum strontium cobalt ferrite (LSCF) cathode and a scandia-ceria-stabilised zirconia (ScCeSZ) electrolyte within a solid oxide fuel cell (SOFC) configuration. A 5.5 μm-thick GDC film was deposited using a 50 wt% GDC slurry in 3 cycles. The single cell comprising this GDC film produced a peak power density of over 1.00 W•cm−2 at 750 °C in hydrogen operation. Electrochemical impedance spectroscopy was carried out to investigate the SOFC performance evolution with potential changes in microstructure over time. An operational stability test was also conducted at a current density of 0.2 A•cm−2 for over 1200 h. The degradation behaviour of each electrochemical process as a function of cell operating time was evaluated by the distribution of relaxation times method based on the obtained electrochemical impedance spectra

Método para integração entre as ferramentas BPM, FMEA e TR de análise e melhoria de processos organizacionais

Trabalho de Conclusão de Curso (graduação) — Universidade de Brasília, Faculdade UnB Gama, 2020.Este trabalho possui como objetivo propor um método para promover a integração de ferramentas de análise e melhoria de processos de negócio. A metodologia empregada será a partir de um estudo de caso aplicado em um banco de sangue. Destaca-se a filosofia da gestão por processo de negócio, o processo de raciocínio da Teoria das Restrições e a Análise de Modo e Efeito de Falhas (FMEA). Estas são ferramentas, que tem por princípio uma atuação na melhoria dos sistemas organizacionais gerando uma eliminação de desperdícios e buscando a melhoria contínua com o propósito maior de tornarem as empresas mais competitivas. Estas ferramentas tradicionalmente atuam de forma isolada e, apesar de possuírem, em seus métodos de aplicação, algumas sobreposições de passos metodológicos e convergirem para um objetivo comum, a melhoria, percebe-se a possibilidade de uma integração mais concreta e com potencial de gerar mais resultados para os gestores. A competitividade é deve ser alcançado a fim de garantir a sobrevivência e o crescimento das empresas que estão inseridas em um ambiente hostil e de extrema concorrência. Nos últimos anos, o conceito de processos de negócios cresceu consideravelmente, permitindo às empresas uma mudança de organização que tinha como característica básica um padrão departamental e que passou para um padrão mais orientado aos processos de negócio. Esta nova abordagem, mais sistêmica e integrada, permitiu uma gestão mais eficiente e eficaz, gerando ganhos em termos de competitividade. Diante da necessidade de uma melhoria contínua em um ambiente de alta concorrência e no contexto de um sistema organizacional de uma alta complexidade, surgem diversas filosofias, conceitos, técnicas e ferramentas de gestão para darem suporte aos gestores no alcance de suas metas em relação à condução de suas empresas. A proposta deste trabalho é o estudo da aplicação das ferramentas de melhoria de processos sendo aplicada este novo método integrado (MI) em uma simulação hipotética. O resultado obtido foi de um processo com maior robustez, confiabilidade e técnicas mais completas.This workr aims to propose a method to promote the integration of business process analysis and improvement tools. The methodology will be based on a case study applied in a blood bank. We highlight the business process management philosophy, the constraint theory reasoning process and the Failure Mode and Effect Analysis (FMEA). These are tools, whose principle is to improve organizational systems by generating waste elimination and seeking continuous improvement with the greater purpose of making companies more competitive. These tools traditionally act in isolation and, although they have some methodological steps overlapping in their application methods and converge towards a common goal, improvement, we realize the possibility of a more concrete integration with the potential to generate more results for managers. Competitiveness is to be achieved in order to ensure the survival and growth of companies operating in a hostile and extremely competitive environment. In recent years, the concept of business processes has grown considerably, allowing companies to change their organization that had a departmental pattern as its basic feature and has shifted to a more business-oriented pattern. This new, more systemic and integrated approach has enabled more efficient and effective management, leading to competitiveness gains. Faced with the need for continuous improvement in a highly competitive environment and in the context of a highly complex organizational system, various management philosophies, concepts, techniques and tools emerge to support managers in achieving their driving goals. of your companies. The purpose of this work is to study the application of process improvement tools, applying this new integrated method (IM) in a hypothetical simulation. The result obtained was a process with greater robustness, reliability and more complete techniques

Improving environmental sustainability of agriculture in Egypt through a life-cycle perspective

Soil plays an essential role as a habitat, source of nutrients and support for vegetation. Promoting food security and environmental sustainability of agricultural systems requires an integrated approach to soil fertility management. Agricultural activities should be developed with preventive approaches aimed at avoiding or reducing negative impacts on the soil physicochemical and biological properties and the depletion of soil nutrient reserves. In this regard, Egypt has developed the Sustainable Agricultural Development Strategy to encourage environmentally friendly practices among farmers, such as crop rotation and water management, in addition to extending agriculture to desert areas, favoring the socio-economic development of the region. In order to evaluate the outcomes of the plan beyond quantitative data of production, yield, consumption and emissions, the environmental profile of agriculture in Egypt has been assessed under a life-cycle perspective in order to identify the associated environmental burdens and ultimately contribute to improving the sustainability policies of agricultural activity within the framework of a crop rotation system. In particular, a two-year crop rotation (Egyptian clover-maize-wheat) was analyzed in two distinct agricultural areas in Egypt: New Lands in desert regions and Old Lands along the Nile River, traditionally recognized as fertile areas due to the river alluvium and water availability. The New Lands had the worst environmental profile for all impact categories, except for Soil organic carbon deficit and Global potential species loss. Irrigation and on-field emissions associated with mineral fertilization were identified as the most critical hotspots of Egyptian agriculture. In addition, land occupation and land transformation were reported as the main drivers of biodiversity loss and soil degradation, respectively. Beyond these results, further research on biodiversity and soil quality indicators is needed to more accurately assess the environmental damage caused by the conversion of deserts into agricultural areas, given the species richness these regions holdThis research is supported by the project Enhancing diversity in Mediterranean cereal farming systems (CerealMed), funded by PRIMA Programme, FEDER/Ministry of Science and Innovation– Spanish National Research Agency (PCI2020-111978); and Academy of Scientific Research and Technology (ASRT); and the project Transition to sustainable agri-food sector bundling life cycle assessment and ecosystem services approaches (ALISE), funded by the Spanish National Research Agency (TED2021-130309B-I00). S.L.O., M.T.M. and S.G.G belong to the Galician Competitive Research Group (GRC ED431C-2021/37) and to the Cross-disciplinary Research in Environmental Technologies (CRETUS Research Center, ED431E 2018/01)This research is supported by the project Enhancing diversity in Mediterranean cereal farming systems (CerealMed), funded by PRIMA Programme, FEDER/Ministry of Science and Innovation– Spanish National Research Agency (PCI2020-111978); and Academy of Scientific Research and Technology (ASRT); and the project Transition to sustainable agri-food sector bundling life cycle assessment and ecosystem services approaches (ALISE), funded by the Spanish National Research Agency (TED2021-130309B-I00). S.L.O., M.T.M. and S.G.G belong to the Galician Competitive Research Group (GRC ED431C-2021/37) and to the Cross-disciplinary Research in Environmental Technologies (CRETUS Research Center, ED431E 2018/01)S

Visão dos alunos da escola pública sobre vídeo games no ensino de língua inglesa e a proposta com o RPG maker

Anais do II Seminário Seminário Estadual PIBID do Paraná: tecendo saberes / organizado por Dulcyene Maria Ribeiro e Catarina Costa Fernandes — Foz do Iguaçu: Unioeste; Unila, 2014Muitos autores tem defendido o uso de MMOS (massive multiplayer online games) na aquisição de uma segunda língua (RAMA ET AL., 2009; PETERSON, 2012). Desse modo, este trabalho objetiva relatar a visão dos alunos sobre videogames e ensino de línguas. Para tanto, analisamos as narrativas produzidas pelos alunos por meio da Análise de Conteúdo (BARDIN, 1977). A coleta dos dados foi realizada em uma sala de 3o ano de um Colégio Estadual de Londrina. Os resultados apontam que os estudantes (a) acreditam que o desenvolvimento da língua pode ser desenvolvido atráves dos jogos; (b) relatam que o interesse pela língua é maior nos jogos, do que na escola, (c) acreditam que o vocabulário aprendido está intrinsicamente ligado ao tipo de jogo ao qual se joga, e que (d) os MMOs parecem ser jogos que mais oferecem vantagen