This dissertation integrates a process-based hydrological investigation with an ongoing paired-catchment study to better understand how forest harvest impacts catchment function at multiple scales. We do this by addressing fundamental questions related to the stocks, flows and transit times of water. Isotope tracers are used within a top-down catchment intercomparison framework to investigate the role of geology in controlling streamwater mean transit time and their scaling relationships with the surrounding landscape. We found that streams draining catchments with permeable bedrock geology at the Drift Creek watershed in the Oregon Coast Range had longer mean transit times than catchments with poorly permeable bedrock at the HJ Andrews Experimental Forest in the Oregon Cascades. We also found that differences in permeability contrasts within the subsurface controlled whether mean transit time scaled with indices of catchment topography (for the poorly permeable bedrock) or with catchment area (for the permeable bedrock). We then investigated the process-reasons for the observed differences in mean transit time ranges and scaling behavior using a detailed, bottom-up approach to characterize subsurface water stores and fluxes. We found that the mean transit times in catchments underlain by permeable bedrock were influenced by multiple subsurface storage pools with different groundwater ages, whereas storage in the poorly permeable catchments was limited to the soil profile and that resulted in quick routing of excess water to the stream at the soil bedrock interface, leading to mean transit times that were closely related to flowpath lengths and gradients. Finally, we examined how and where forest trees interacted with subsurface storage during the growing season using a forest manipulation experiment, where we tested the null hypothesis that near-stream trees alone influenced daily fluctuations in streamflow. We felled trees within this zone for two 2.5 ha basins and combined this with isotopic tracing of tree xylem water to test if water sources utilized by trees actively contributed to summer streamflow. We rejected our null hypotheses and found that diel fluctuations in streamflow were not generated exclusively in the near-stream zone. We were unable to link, isotopically, the water sources trees were utilizing to water that was contributing to streamflow. Our results provide new process-insights to how water is stored, extracted, and discharged from our forested catchments in Western Oregon that will help better explain how forest removal influences streamflow across multiple scales and geological conditions. / Graduation date: 2012

Submitted by Fabio Sobreira Campos da Costa (fabio.sobreira@ufpe.br) on 2016-07-11T12:33:28Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) silas-dissertacao-versao-final-2016.pdf: 1708159 bytes, checksum: 6c0efc5f2f0b27c79306418c9de516f1 (MD5) / Made available in DSpace on 2016-07-11T12:33:28Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) silas-dissertacao-versao-final-2016.pdf: 1708159 bytes, checksum: 6c0efc5f2f0b27c79306418c9de516f1 (MD5) Previous issue date: 2015-02-27 / FACEPE / A extração de conhecimento em ambientes com fluxo contínuo de dados é uma atividade que vem crescendo progressivamente. Diversas são as situações que necessitam desse mecanismo, como o monitoramento do histórico de compras de clientes; a detecção de presença por meio de sensores; ou o monitoramento da temperatura da água. Desta maneira, os algoritmos utilizados para esse fim devem ser atualizados constantemente, buscando adaptar-se às novas instâncias e levando em consideração as restrições computacionais. Quando se trabalha em ambientes com fluxo contínuo de dados, em geral não é recomendável supor que sua distribuição permanecerá estacionária. Diversas mudanças podem ocorrer ao longo do tempo, desencadeando uma situação geralmente conhecida como mudança de conceito (concept drift). Neste trabalho foi realizado um estudo comparativo entre alguns dos principais métodos de detecção de mudanças: ADWIN, DDM, DOF, ECDD, EDDM, PL e STEPD. Para execução dos experimentos foram utilizadas bases artificiais – simulando mudanças abruptas, graduais rápidas, e graduais lentas – e também bases com problemas reais. Os resultados foram analisados baseando-se na precisão, tempo de execução, uso de memória, tempo médio de detecção das mudanças, e quantidade de falsos positivos e negativos. Já os parâmetros dos métodos foram definidos utilizando uma versão adaptada de um algoritmo genético. De acordo com os resultados do teste de Friedman juntamente com Nemenyi, em termos de precisão, DDM se mostrou o método mais eficiente com as bases utilizadas, sendo estatisticamente superior ao DOF e ECDD. Já EDDM foi o método mais rápido e também o mais econômico no uso da memória, sendo superior ao DOF, ECDD, PL e STEPD, em ambos os casos. Conclui-se então que métodos mais sensíveis às detecções de mudanças, e consequentemente mais propensos a alarmes falsos, obtêm melhores resultados quando comparados a métodos menos sensíveis e menos suscetíveis a alarmes falsos. / Knowledge extraction from data streams is an activity that has been progressively receiving an increased demand. Examples of such applications include monitoring purchase history of customers, movement data from sensors, or water temperatures. Thus, algorithms used for this purpose must be constantly updated, trying to adapt to new instances and taking into account computational constraints. When working in environments with a continuous flow of data, there is no guarantee that the distribution of the data will remain stationary. On the contrary, several changes may occur over time, triggering situations commonly known as concept drift. In this work we present a comparative study of some of the main drift detection methods: ADWIN, DDM, DOF, ECDD, EDDM, PL and STEPD. For the execution of the experiments, artificial datasets were used – simulating abrupt, fast gradual, and slow gradual changes – and also datasets with real problems. The results were analyzed based on the accuracy, runtime, memory usage, average time to change detection, and number of false positives and negatives. The parameters of methods were defined using an adapted version of a genetic algorithm. According to the Friedman test with Nemenyi results, in terms of accuracy, DDM was the most efficient method with the datasets used, and statistically superior to DOF and ECDD. EDDM was the fastest method and also the most economical in memory usage, being statistically superior to DOF, ECDD, PL and STEPD, in both cases. It was concluded that more sensitive change detection methods, and therefore more prone to false alarms, achieve better results when compared to less sensitive and less susceptible to false alarms methods.

INTRODUCTION: Cardiovascular drift is a phenomenon, which appears after 10 - 20 minutes of prolonged moderate - intensity exercise (50 - 75% VO2max). CVD appears in a neutral or hot environment. It is characterized by a decline in stroke volume and systemic mean arterial pressures and a parallel increase in heart rate. Cardiac output is maintained nearly constant. The theory of CVD shows increase of core temperature and sympathetic nervous system as cause of increase of heart rate. GOALS: The goal of this thesis was find out the change of heart rate depending on time. Then we found out changes of oral, tympanic, axillary, vaginal and superficial skin temperature. We found out correlation between vaginal temperature and heart rate and then between skin temperature and vaginal temperature. METHODS: Blood pressure, heart rate, oral, tympanic, axillary, vaginal and superficial skin temperature were measured during 60 minutes of cycling (intensity 55% VO2max; 1,99 ± 0,14 W/kg). It was measured at 13 women (25,5 ± 1,3 years; 69,1 ± 7,7 kg). RESULTS and CONCLUSION: There was statistically significant increase of heart rate compared to value from 10. minute. during. There was increase of tympanic temperature compared to value from 10. minute only at the end of exercise. There was significant increase of vaginal and...

[pt] Na produção de gás e petróleo em campos de águas profundas são comumente encontrados trechos verticais de dutos (risers) na aproximação final à plataforma. Nesta configuração, podem ocorrer escoamentos bifásicos no regime de golfadas severas (severe slug) que gera alternância na produção da fase gasosa e líquida. Esta alternância é caracterizada por períodos de produção de gás sem líquido seguido de altas taxas de produção de ambas as fases. O regime severo de golfadas é geralmente descrito em quatro fases: formação da golfada, produção da golfada, rompimento da golfada pela fase gás e fluxo reverso do que restou da fase líquida. Este regime induz o escoamento a condições mais extremas do que um outro regime, visto que resultam em um aumento de pressão no duto durante a formação da golfada e em um aumento na taxa de produção durante a expulsão da mesma. O presente trabalho consiste da simulação numérica do regime de golfadas severas para um trecho de tubulação horizontal seguido de outro vertical, assim como apresentar uma análise de um regime estatisticamente permanente. A previsão do escoamento é obtida utilizando-se uma formulação unidimensional baseada no modelo de Drift. A freqüência das golfadas é comparada com outros estudos numéricos da literatura, obtendo-se uma concordância bastante satisfatória. / [en] In the gas and oil offshore deep water production is usual to find risers in Production Unit final approach. Regarding to this configuration, two-phase flows can evolve to a severe slug regime that create gas and liquid alternate production. This cyclic behavior is characterized by periods of gas production followed by very high liquid and gas flow rates. The severe slug flow regime is normally described as occurring in four phases: slug formation, slug production, blowout, and liquid fallback. This flow regime introduces new conditions that can be found in other regimes because of the pressure increase during the slug formation and the large flow rates during the slug production. The present work consists of the numerical simulation of the severe slug flow regime into a horizontal pipeline section followed by a vertical section, as well as to present an statistically steady state analysis. The flow prediction is obtained through a one-dimensional formulation based on the Drift Flux Model. The slug frequency is compared with other numerical studies available in the literature, and a very satisfactory agreement is obtained.

Submitted by JOSIANE SANTOS DE OLIVEIRA (josianeso) on 2018-08-06T14:45:05Z No. of bitstreams: 1 Elisângela Marlize Dalpiaz de Azeredo_.pdf: 1506700 bytes, checksum: 0a85bcb1bedded10aaf79f106d4afee8 (MD5) / Made available in DSpace on 2018-08-06T14:45:05Z (GMT). No. of bitstreams: 1 Elisângela Marlize Dalpiaz de Azeredo_.pdf: 1506700 bytes, checksum: 0a85bcb1bedded10aaf79f106d4afee8 (MD5) Previous issue date: 2018-03-27 / CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / O interesse pelos negócios de impacto social vem crescendo nas últimas décadas, tendo em vista que estes negócios representam uma fonte promissora de geração de valor social, econômico e financeiro. Entretanto, ao aliarem criação de valor social e sustentabilidade financeira, combinam elementos provenientes de lógicas institucionais diferentes, podendo enfrentar desafios inerentes a esta junção. Desta forma, a fim de que estes negócios obtenham êxito, faz-se necessário o desenvolvimento de um ecossistema de suporte robusto. Dentre os atores do ecossistema, destacam-se as aceleradoras, que visam apoiar o crescimento destes negócios, na fase inicial ou de expansão, exercendo, desta forma, um papel importante na construção e desenvolvimento das lógicas institucionais nestes negócios. Por consequência, influenciam a forma pela qual evitam mission drift, fenômeno que consiste no distanciamento do negócio da sua missão social. Sendo assim, o objetivo deste estudo é analisar as estratégias utilizadas pelas aceleradoras para assegurar e monitorar que os negócios de impacto mantenham a lógica híbrida, alcançando o equilíbrio entre a criação de valor social e a sustentabilidade financeira, evitando mission drift. A fim de atingir o objetivo proposto, foi realizado um estudo de caso múltiplo, com quatro aceleradoras, que atuam com negócios de impacto social. Por meio da compreensão do papel que exercem na manutenção da lógica híbrida dos negócios impulsionados por elas, identificaram-se as fontes de mission drift, bem como as estratégias para evitar o fenômeno durante o programa de aceleração, contribuindo, desta forma, com o campo teórico e gerencial. As implicações teóricas do estudo consistem na identificação da influência que as aceleradoras exercem nos negócios de impacto impulsionados por elas, por meio das estratégias utilizadas para assegurar a manutenção da lógica híbrida, contribuindo tanto para o estudo das lógicas institucionais quanto do fenômeno mission drift. No que tange às contribuições gerenciais, fornece um conjunto de estratégias a serem utilizadas pelas aceleradoras, a fim de assegurar e monitorar a manutenção do equilíbrio entre a criação de valor social e a sustentabilidade financeira nos negócios que aceleram. / The interest by the social enterprises has been growing in recent decades, considering that these organizations represent a promising source for generating social, economic and financial value. However, as they ally social value creation and financial sustainability, they combine elements from different institutional logics and may face challenges inherent to this combination. In this way, in order that these organizations achieve success, it is necessary to develop a robust support ecosystem. Among the actors of the ecosystem, the accelerators stand out. They aim to support the growth of social enterprises at an early stage or an expansion stage, exercising, in this way, an important role in the construction and development of institutional logics in these organizations. Consequently, they influence the way in which them avoid mission drift, a phenomenon that consists in the detachment of a business from its social mission. Therefore, the objective of this study is to analyze the strategies used by the accelerators to ensure and to monitor that the social enterprises maintain the hybrid logic, achieving the balance between the creation of social value and financial sustainability, avoiding mission drift. In order to achieve the proposed objective, it was conducted a multiple case study, with four accelerators, working with social enterprises. The sources of mission drift, as well as the strategies to avoid the phenomenon during the acceleration were identified through the understanding of the role that the accelerators exercise in maintaining the hybrid business logic in the business fueled by them, contributing, in this way, with the theoretical and managerial field. The theoretical implications of the study consist in the identification of the influence that the accelerators exert over the social enterprises boosted by them, through the strategies used to ensure the maintenance of the hybrid logic, contributing to the study of institutional logics as well as to the phenomenon of mission drift. Regarding the managerial contributions, the study provides a set of strategies to be used by the accelerators, in order to ensure and monitor the maintenance of the balance between the creation of social value and the financial sustainability in the business accelerated by them.

Abstract This report was undertaken at the request of the Management and maintenance department of Swedish National Road Authority (Vägverket Region Sydöst) in Jönköping. In 1992, the management and maintenance of Swedish roads were laid out on external contractors. When putting out a tender for the work, the foundation is from a national set of rules which are in constant change. This report is limited to winter road upkeep. The trend in the invitation for tenders is that it is moving from the more conventional executional demands towards the less controlling demands. The downside of functional, less controlling demands is that it is difficult to articulate how to measure them. The order authority therefore has to find ways to make sure to get what has been paid for. In connection to the invitation for tender of winter road upkeep for 2005, the new set of rules, ATB Vinter 2003 was deployed. The main purpose of this thesis is to see which the big changes in the set of rules are and how these changes affect the organisation and activities of the contractor. It is also studied how the changes in execution is perceived by road users and how it affects the possibilities of the contractor to come as a newcomer to a new area of administration. Interviews and examination of sets of rules has led to a list of a number of changes that the contractors feel affect their work in any sense. Views from road users that have come in to the order authority have been scrutinized to see how they have experienced the change. When selecting which areas of administration to examine, care was taken to ensure that one was where the same contractor secured a renewed contract for the area over the gap of changing rules and the other one was area where the contractor was a newcomer. The result shows a number of changes and how these affect both the contractors and the road users. The report describes how winter road upkeep is maintained in the south of Sweden and the cooperation between buyer and contractor.

A cryogenic (325-80 K) ion mobility-mass spectrometer was designed and constructed in order to improve the analytical figures-of-merit for the chemical analysis of small mass analytes using ion mobility-mass spectrometry. The instrument incorporates an electron ionization source, a quadrupole mass spectrometer, a uniform field drift cell spectrometer encased in a cryogenic envelope, and an orthogonal geometry time-of-flight mass spectrometer. The analytical benefits of low temperature ion mobility are discussed in terms of enhanced separation ability, ion selectivity and sensitivity. The distinction between resolving power and resolution for ion mobility is also discussed. Detailed experimental designs and rationales are provided for each instrument component. Tuning and calibration data and methods are also provided for the technique. Proof-of-concept experiments for an array of analytes including rare gases (argon, krypton, xenon), hydrocarbons (acetone, ethylene glycol, methanol), and halides (carbon tetrachloride) are provided in order to demonstrate the advantages and limitations of the instrument for obtaining analytically useful information. Trendline partitioning of small analyte ions based on chemical composition is demonstrated as a novel chemical analysis method. The utility of mobility-mass analysis for mass selected ions is also demonstrated, particularly for probing the ion chemistry which occurs in the drift tube for small mass ions. As a final demonstration of the separation abilities of the instrument, the electronic states of chromium and titanium (ground and excited) are separated with low temperature. The transition metal electronic state separations demonstrated here are at the highest resolution ever obtained for ion mobility methods. The electronic conformational mass isomers of methanol (conventional and distonic) are also partially separated at low temperature. Various drift gases (helium, neon, and argon) are explored for the methanol system in order to probe stronger ion-neutral interaction potentials and effectuate higher resolution separations of the two isomeric ions. Finally, two versatile ion source designs and a method for axially focusing ions at low pressure (1-10 torr) using electrostatic fields is presented along with some preliminary work on the ion sources.

Maximum interstory drift and the distribution of this drift along the height of the structure are the main causes of structural and nonstructural damage in frame type buildings subjected to earthquake ground motions. Estimation of maximum interstory drift ratio is a good measure of the local response of buildings. Recent earthquakes have revealed the susceptibility of the existing building stock to near-fault ground motions characterized by a large, long-duration velocity pulse. In order to find rational solutions for the destructive effects of near fault ground motions, it is necessary to determine drift demands of buildings. Practical, applicable and accurate methods that define the system behavior by means of some key parameters are needed to assess the building performances quickly instead of detailed modeling and calculations. In this study, simple equations are proposed in order for the determination of the elastic interstory drift demand produced by near fault ground motions on regular and irregular steel frame structures. The proposed equations enable the prediction of maximum elastic ground story drift ratio of shear frames and the maximum elastic ground story drift ratio and maximum elastic interstory drift ratio of steel moment resisting frames. In addition, the effects of beam to column stiffness ratio, soft story factor, stiffness distribution coefficient, beam-to-column capacity ratio, seismic force reduction factor, ratio of pulse period to fundamental period, regular story height and number of stories on elastic and inelastic interstory drift demands are investigated in detail. An equation for the ratio of maximum inelastic interstory drift ratio to maximum elastic interstory drift ratio developed for a representative case is also presented.

<p>Abstract</p><p>This report was undertaken at the request of the Management and maintenance</p><p>department of Swedish National Road Authority (Vägverket Region Sydöst) in</p><p>Jönköping.</p><p>In 1992, the management and maintenance of Swedish roads were laid out on</p><p>external contractors. When putting out a tender for the work, the foundation is</p><p>from a national set of rules which are in constant change. This report is limited to</p><p>winter road upkeep.</p><p>The trend in the invitation for tenders is that it is moving from the more</p><p>conventional executional demands towards the less controlling demands. The</p><p>downside of functional, less controlling demands is that it is difficult to articulate</p><p>how to measure them. The order authority therefore has to find ways to make</p><p>sure to get what has been paid for.</p><p>In connection to the invitation for tender of winter road upkeep for 2005, the new</p><p>set of rules, ATB Vinter 2003 was deployed.</p><p>The main purpose of this thesis is to see which the big changes in the set of rules</p><p>are and how these changes affect the organisation and activities of the contractor.</p><p>It is also studied how the changes in execution is perceived by road users and how</p><p>it affects the possibilities of the contractor to come as a newcomer to a new area</p><p>of administration.</p><p>Interviews and examination of sets of rules has led to a list of a number of</p><p>changes that the contractors feel affect their work in any sense.</p><p>Views from road users that have come in to the order authority have been</p><p>scrutinized to see how they have experienced the change. When selecting which</p><p>areas of administration to examine, care was taken to ensure that one was where</p><p>the same contractor secured a renewed contract for the area over the gap of</p><p>changing rules and the other one was area where the contractor was a newcomer.</p><p>The result shows a number of changes and how these affect both the contractors</p><p>and the road users.</p><p>The report describes how winter road upkeep is maintained in the south of</p><p>Sweden and the cooperation between buyer and contractor.</p>

No description available.