Esta tese investiga novas estratégias para a construção de modelos em tempo real de Sistemas Elétricos de Potência. Busca-se a melhoria das funções de Estimação de Estado e aplicações correlatas por meio da consideração da medição fasorial sincronizada, fornecida por dispositivos PMUs, em ambientes onde as regiões monitoradas são de domínios de empresas diferentes e cuja distribuição geográfica apresenta distâncias consideráveis, como é o caso brasileiro. Uma das tarefas mais críticas dentro deste contexto é a representação adequada de sistemas não monitorados, que devem ser modelados de forma precisa, robusta e, preferencialmente, considerando dados que são acessíveis ao operador. A incorporação de redes externas em estimação multiárea é efetuada por uma etapa adicional de estimação ou embutida diretamente nos processos iterativos locais, mediante, neste último caso, a exigência de contínuos fluxos de dados entre áreas. No entanto, constata-se, neste estudo, que modelos clássicos de Equivalentes Externos reduzidos, particularmente os modelos tipo Ward, atendem satisfatoriamente aos requisitos computacionais e de precisão do problema, desde que sejam devidamente atualizados a cada mudança do ponto de operação. Desta forma, considerando sincrofasores de tensão e de corrente coletados por PMUs em regiões de fronteira, desenvolve-se um modelo de Estimação de Estado Descentralizada em que a etapa de pós-processamento por agentes externos independentes é removida, permitindo a obtenção do estado interconectado em um único passo, sem intercâmbio de dados operacionais em tempo real. Dois modelos são implementados, que diferem essencialmente na forma de tratamento dos dados de equivalentes externos. A metodologia é codificada em linguagem C++, sendo validada nos Sistemas IEEE de 14, 30 e 118 barras sob várias configurações de medição e de particionamento, mediante análise estatística e comparação de estimativas com valores de referência. Os resultados obtidos indicam a viabilidade da proposta para o fornecimento de modelos de estimação de estado mais confiáveis, adaptados à atual tendência de descentralização de redes elétricas, sem grandes alterações nas funções já existentes e sob um custo computacional reduzido. Sugerem também a factibilidade do tratamento conjunto das funções relacionadas a Estimação de Estado e Equivalentes Externos. / New approaches for the real time modelling of Power Systems are investigated in this work. The improvement of State Estimation and related functions is pursued with the aid of synchronized measurements gathered by PMU devices, in a multi-owner environment where utilities are independent and distributed across large distances, as in the Brazilian interconnected system case. One of the critical tasks on this subject is the correct representation of non-monitored networks in precise and feasible way, where less data traffic between operators is preferable. In Multiarea State Estimation, the incorporation of external networks is usually performed as the additional estimation phase or directly included in local estimation models by means of inter-area communication channels. This research shows that classic models of External Equivalents, specially Ward types, meet the computational and precision requirements of the problem if they are correctly updated after changes in the operating point. Thus, by using voltage and current synchrophasors measured by boundary PMUs, a Decentralized State Estimation model is developed, where the need for a post-processing higher coordination step is suppressed, allowing the interconnected state to be found rapidly, in a single step and with no real time data exchange. Two strategies of including on-line information about External Equivalents are proposed, taking it as regular measurements or constraints to be imposed in the classical formulation. A computational software coded in C++ language is built to support the models, which are validated with the IEEE-14, 30 and 118 test bed systems, under several placement strategies and split network schemes. A consistent statistical analysis of the results is also performed, where outcomes are compared with reference values of a regular estimator. Results indicate the feasibility to generate reliable and robust real time models, without significant changes in existing energy management applications, and also shows the greater benefits of integrating State Estimation and External Equivalents into a single framework.

科学研究費補助金 研究種目:基盤研究(C)(2) 課題番号:09650665 研究代表者:山下 哲郎 研究期間:)97-1998年度

Zugl.: Mannheim, University, Diss., 2006.

Submitted by FERNANDO ENRIQUE SERNA ALGARÍN null (ferse1129@gmail.com) on 2018-01-10T21:52:53Z No. of bitstreams: 1 tese.pdf: 948147 bytes, checksum: 94d535ccc424f5f4201747cae4382d6a (MD5) / Approved for entry into archive by Hellen Sayuri Sato null (hellen@ift.unesp.br) on 2018-01-12T15:54:08Z (GMT) No. of bitstreams: 1 algarin_fcs_dr_ift.pdf: 948147 bytes, checksum: 94d535ccc424f5f4201747cae4382d6a (MD5) / Made available in DSpace on 2018-01-12T15:54:08Z (GMT). No. of bitstreams: 1 algarin_fcs_dr_ift.pdf: 948147 bytes, checksum: 94d535ccc424f5f4201747cae4382d6a (MD5) Previous issue date: 2017-10-02 / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) / Nesta tese empregamos um modelo de interação de contato que preserva simetrias para estudar estrututura hadrônica e matéria de quarks. A interação de contato é uma representação de kernels não perturbativos usados em equações de Dyson-Schwinger e Bethe-Salpeter da Cromodinâmica Quântica (QCD). A ideia básica do modelo está baseada num esquema de subtração que evita passos tradicionais no cálculo de de integrais divergentes que invariavelmente levam a violações de simetrias. Em temperatura zero, as equações de Dyson-Schwinger equation para os propagadores dos quarks u; d; s and c são resolvidas e amplitudes de estado ligado de Bethe-Salpeter, que respeitam a invariância sob translações espaço-temporais e as identidades de Ward-Takahashi associadas com simetrias globais da QCD, são obtidas para calcular as massas e as constantes de decaimento eletrofracas dos mésons pseudoscalares π; K, D e Ds e dos mésons vetorias ρ, K*, D* e Ds*. As predições do modelo estão em bom acordo com dados experimentais e da QCD na rede. Em adição, estendemos o modelo para temperaturas diferentes de zero; neste caso, o problema de violação de simetrias está restrito apenas às partes puramente divergentes porque os termos que dependem das distribuições térmicas são finitas e não requerem regularização. Finalmente, investigamos a dependência com a temperatura das contribuições das flutuações quânticas quark-π e quark-σ aos coeficientes de transporte de viscosidade de cisalhamento η e volumétrica ζ e as suas razões com a densidade de entropia s. As larguras térmicas originárias dessas fluctuações são calculadas com o formalismo de teoria de campos a temperatura finita de tempo real. Para esse cálculo, empregamos os resultados obtidos com as equações de Dyson-Schwinger e Bethe-Salpeter para a dependência com a temperatura das massas dos mésons e as contantes de acoplamento quark-méson. Os resultados para as razões η/s and ζ/s estão em bom acordo com resultados com a literatura obtidos com modelos e técnicas diferentes. Em particular, nossos resultados para η/s possuem um mínimo muito próximo ao limite inferior da conjectura AdS/CFT, η/s = 1/4π. / In thesis, a symmetry-preserving contact interaction model is used to study hadron structure and quark matter. The contact interaction is a representation of nonperturbative kernels used in Dyson-Schwinger and Bethe-Salpeter equations of Quantum Chromodynamics (QCD). The basic idea of the model is based on a subtraction scheme that avoids standard steps in the evaluation of divergent integrals that invariably lead to symmetry violation. At zero temperature, the Dyson-Schwinger equation is solved for the u; d; s and c quark propagators and the boundstate Bethe-Salpeter amplitudes respecting spacetime-translation invariance and the Ward-Green-Takahashi identities associated with global symmetries of QCD are obtained to calculate masses and electroweak decay constants of the pseudoscalar π; K, D and Ds and vector ρ, K*, D*, and Ds* mesons. The predictions of the model are in good agreement with available experimental and lattice QCD data. In addition, we extend the model to nonzero temperature; here, the problem of symmetry violation is associated only with the purely divergent parts because the effects due to the termal distributions are finite and do not need regularization. We compute the temperature dependence of the masses and decay constants of the pseudoscalar mesons considered here. Finally, we have investigated the temperature dependence of the contributions of quark-π and quark-σ quantum fluctuations to the transport coefficients of shear η and bulk ζ viscosities and their ratios to the entropy density s. The quark thermal widths originating those fluctuations are calculated with the formalism of real-time thermal field theory. For these calculations, we have used the results obtained via Dyson-Schwinger and Bethe-Salpeter equations for the temperature dependence of constituent quark and meson masses and quark-meson couplings. The results for the ratios η/s and ζ/s are in fair agreement with results of the literature obtained from different models and techniques. In particular, our result for η/s has a minimum very close to the conjectured AdS/CFT lower bound, η/s = 1/4π. / CNPq:140041/2014-1

Background: Occupational stress is a global and complex phenomenon, and workers in developing countries can be affected by it (International Labour Organisation 2001). Staff within maternity settings have been identified as being at risk of suffering from stress, resulting in adverse health outcomes (Evenden and Sharpe, 2002). However, MWAs’ perceptions of stress have not been captured and are not reflected in the literature. Purpose: The aim of this study was to explore MWAs’ perceptions of occupational stress, possible cause(s), the impact and support available and the coping methods they adopted within maternity care settings (hospital) in Nigeria. Methodology: This study adopted a qualitative methodology. Husserl’s (1962) phenomenological approach was chosen as it enabled the researcher to collect rich, in-depth, descriptive accounts of the MWAs’ perceptions of the phenomenon under study through the use of semi-structured interviews. Findings: The major sources of stress for MWAs included work overload, long working hours, staff shortages, work exploitation and intensification and lack of support from senior staff. The stress levels MWAs experienced impacted on their health and well-being and resulted in related behavioural and physical reactions. Conclusion: This study confirmed that MWAs were exposed to similar stress factors experienced by other health workers and reported in the research literature. Additionally, it demonstrated the need for more qualitative studies to explore the perceptions of occupational stress among under-represented groups of healthcare workers. Importantly, this study created an opportunity to explore the experience of dedicated women facing challenging employment practices in hospital settings in Nigeria. Equally, it gave a voice to these unrecognised, almost invisible women, who were the MWAs that played a key role within the maternity services.

Made available in DSpace on 2014-08-20T14:25:52Z (GMT). No. of bitstreams: 1 dissertacao_naile_nunes_vaghetti.pdf: 2548969 bytes, checksum: 7869818d5174fd0ef45be9aa60ebf4b2 (MD5) Previous issue date: 2011-06-10 / The knowledge of relative humidity and its interactions with other variables helps plan of various activities, such as the operation of aeration systems for storing grain and seed, the cooling of environments for breeding and maintenance for environmental comfort. The Rio Grande do Sul state, in function of its geographical position, is a region strongly influenced by meteorological systems, in which the behavior of the relative humidity needs further study. The objective of this work was the study of the relative humidity behavior in the state of Rio Grande do Sul, was used data from monthly averages of 26 meteorological stations in the period 1975 to 2009. For this purpose, the homogeneous regions were determined through analysis of grouping and the grouping method of Ward that has better consistent with the climatic characteristics of the state, in which has been obtained four regions: R1, R2, R3 e R4. For all regions, was made a climatologically study through statistical parameters in order to analyze the climatic variability of this variable. The spatial distribution of relative humidity allowed observing that it has a high pattern in the entire state, being the coastal region the most humid. The relative humidity has only in Regions 2 and 3, a significant linear trend over time, with monthly increase of 0.006% and 0.005%, respectively. During the thirty five years, the monthly increase was 2.52% for the region 2 and 2.1% for the region 3. Was also applied the technique of harmonic analysis to humidity relative data. The proposed models of this harmonic analysis expressed the seasonality of this data with more than 80% of representatively, using for this, two or three sine waves. / O conhecimento da umidade relativa do ar e de suas interações com outras variáveis ajuda no planejamento das mais diversas atividades, tais como: a operação de sistemas de aeração de grãos e sementes armazenadas, a climatização de ambientes para criação de animais e a manutenção do conforto ambiental. O Estado do Rio Grande do Sul (RS), em função de sua posição geográfica, é uma região que sofre bastante a influência de sistemas meteorológicos, sendo que o comportamento da umidade relativa carece de estudos mais aprofundados. O objetivo deste trabalho foi analisar o comportamento da umidade relativa em regiões homogêneas do Estado do Rio Grande do Sul, utilizando dados de médias mensais de 26 estações meteorológicas, do período de 1975 a 2009. Para isto, foram determinadas regiões homogêneas por meio da Análise de Agrupamento, sendo utilizado como método de agrupamento o método de Ward, o qual mostrou a melhor coerência com as características climáticas do Estado, sendo obtidas quatro regiões: R1, R2, R3 e R4. Para todas as regiões, fez-se um estudo climatológico através de parâmetros estatísticos com a finalidade de se observar a variabilidade climática desta variável. A distribuição espacial da umidade relativa permitiu observar que esta tem um padrão elevado em todo o Estado, sendo a região litorânea a mais úmida. A umidade relativa apresenta, somente nas Regiões 2 e 3, tendência linear significativa ao longo do tempo, com aumentos mensais de 0,006% e 0,005%, respectivamente. O longo dos 35 anos, o aumento mensal total foi de 2,52% para a Região 2 e 2,1% para a Região 3. Aplicou-se também aos dados de umidade relativa a técnica de análise harmônica. Os modelos propostos por esta análise harmônica expressaram a sazonalidade dos dados com mais de 80% de representatividade, utilizando para isto, duas ou três ondas senoidais.

This research is conducted within a postmodern and social construction discourse and in context of narrative and participatory pastoral care and therapy. It has been influenced by the voices of five contextual theologies: a participatory approach to practical theology, narrative, contextual, feminist and liberation theologies. The participatory action research seeks to highlight how narrative and participatory pastoral care and therapy with children at Mary Ward Children’s Home, Kwekwe, Zimbabwe creates an inclusive and caring community. It argues that though residential childcare facilities/children’s homes are considered the last resort in the childcare system, we are witnessing not their demise but their development due to the increased numbers of AIDS-orphans and other vulnerable children in our society. The research aims were:  To develop inclusive narrative and participatory pastoral care and therapy practices at the home.  To co-create narrative and participatory pastoral care and therapy practices that respect the knowledges of the children involved.  To develop an eco-spirituality as participatory pastoral care and therapy practice.  To explore and co-author creative practices of doing narrative and participatory pastoral care and therapy practices which will help the participants integrate into the Home and society. In conclusion, suggestions are made for a narrative and participatory pastoral care and therapy practice that is inclusive and caring. In terms of the experience of children living with disability and experiencing loss, as well as those children who have been abused, it is specifically described as therapeutic, empowering and life-giving. Therefore, home managers, caregivers and pastoral therapists are invited into an ethical and passionate practice of pastoral care and therapy that has the potential to transform the lives of children in a residential child care facility. / Thesis (D. Th. (Practical Theology))

Background: Occupational stress is a global and complex phenomenon, and workers in developing countries can be affected by it (International Labour Organisation 2001). Staff within maternity settings have been identified as being at risk of suffering from stress, resulting in adverse health outcomes (Evenden and Sharpe, 2002). However, MWAs’ perceptions of stress have not been captured and are not reflected in the literature. Purpose: The aim of this study was to explore MWAs’ perceptions of occupational stress, possible cause(s), the impact and support available and the coping methods they adopted within maternity care settings (hospital) in Nigeria. Methodology: This study adopted a qualitative methodology. Husserl’s (1962) phenomenological approach was chosen as it enabled the researcher to collect rich, in-depth, descriptive accounts of the MWAs’ perceptions of the phenomenon under study through the use of semi-structured interviews. Findings: The major sources of stress for MWAs included work overload, long working hours, staff shortages, work exploitation and intensification and lack of support from senior staff. The stress levels MWAs experienced impacted on their health and well-being and resulted in related behavioural and physical reactions. Conclusion: This study confirmed that MWAs were exposed to similar stress factors experienced by other health workers and reported in the research literature. Additionally, it demonstrated the need for more qualitative studies to explore the perceptions of occupational stress among under-represented groups of healthcare workers. Importantly, this study created an opportunity to explore the experience of dedicated women facing challenging employment practices in hospital settings in Nigeria. Equally, it gave a voice to these unrecognised, almost invisible women, who were the MWAs that played a key role within the maternity services.

The purpose of this qualitative, explorative, descriptive and contextual study was to explore and describe nurses’ experiences of hostile behaviour from mentally ill patients in the psychiatric ward of a general hospital and to propose recommendations to the hospital management to support nurses who experienced hostile behaviour from mentally ill patients. Purposive sampling was used to identify the twelve nurses who participated in this study. Data were collected through in-depth face-to-face interviews, drawings and field notes. The data were analysed using Tesch’s descriptive method of open coding and the findings revealed that nurses experienced verbal abuse, physical abuse and sexual harassment from mentally ill patients, and had varied negative and positive responses to these forms of hostile behaviour. Main challenges were identified and recommendations were made to the hospital management to support nurses who experience hostile behaviour from mentally ill patients. / Health Studies / MA (Public Health)

As a facility that offers an important service to its users, a hospital can be considered as a production unit ; a unit that provides health-care service. Therefore, a range of factors that facilitate this service (i.e. healthcare) need to be considered when speaking of improving the productivity in a hospital ward. Evidence suggests that one of the main factors that affect the productivity level of a hospital ward is how the design of the hospital deals with access and circulation of the people inside the ward (e.g. Joseph and Ulrich, 2007). A productivity-oriented circulation system will need to improve staff performance; enhance patients safety, privacy and rate of recovery; minimise the risk of cross-infection; reduce the delay time of external service delivery; create a more welcoming environment for visitors; and reduce the evacuation time in emergency situations. Thus, the need to design ward layouts that benefit from the most effective circulation system cannot be over-emphasised. The study presented in this thesis focused on finding a method for identifying different systems of access and people circulation in hospital wards and how they could affect nursing staff productivity. The study comprised five main phases. The first phase involved a literature review of existing healthcare environments to identify different types of access and people circulation requirements. In the second phase, data on nursing staff s movements were collected from a case study. The third phase focused on categorising and modelling the existing approaches and layout design systems. Phase four provided a comparative study of different categories of people circulation designs and contrasted their advantages and disadvantages to improve access and people circulation. In the fifth and final phase, the study concluded with proposing guidelines for choosing between different layout options in the design of new hospital wards or the refurbishment of the existing ones. Findings of the study included: further empirical and analytical support for the impact of the ward design on nursing staff s performance; a ranking of the suitability of different design layouts for minimising staff s unnecessary walking in wards similar to the case study; the importance of considering different staff members needs in such analyses; and a ranking of the criticality of different routes within a ward.