Teses / dissertações sobre o tema "Dinamics"
Crie uma referência precisa em APA, MLA, Chicago, Harvard, e outros estilos
Veja os 50 melhores trabalhos (teses / dissertações) para estudos sobre o assunto "Dinamics".
Ao lado de cada fonte na lista de referências, há um botão "Adicionar à bibliografia". Clique e geraremos automaticamente a citação bibliográfica do trabalho escolhido no estilo de citação de que você precisa: APA, MLA, Harvard, Chicago, Vancouver, etc.
Você também pode baixar o texto completo da publicação científica em formato .pdf e ler o resumo do trabalho online se estiver presente nos metadados.
Veja as teses / dissertações das mais diversas áreas científicas e compile uma bibliografia correta.
KAVTARADZE, LASHA. "DINAMICS AND LATENT VARIABLES IN APPLIED MACROECONOMICS". Doctoral thesis, Università Cattolica del Sacro Cuore, 2016. http://hdl.handle.net/10280/16793.
Texto completo da fonteThe Ph.D. thesis consist of three chapters on evaluating inflation dynamics in Georgia and modeling and forecasting nominal exchange rates for the European Eastern Partnership (EaP) countries using modern applied econometric techniques. In the first chapter, we survey of models those produce high predictive powers for forecasting exchange rates and inflation. This survey reveals that the factor-based and time-varying parameter (TVP) models generate superior forecasts relative to all other models. In the second chapter, we study inflation dynamics in Georgia using a hybrid New Keynesian Phillips Curve (NKPC) nested within a time-varying parameter (TVP) framework. Estimation of a TVP model with stochastic volatility shows low inflation persistence over the entire time span (1996-2012), while revealing increasing volatility of inflation shocks since 2003. Moreover, parameter estimates point to the forward-looking component of the model gaining importance following the National Bank of Georgia (NBG) adoption of inflation targeting in 2009. In the third chapter, we construct Factor Vector Autoregressive (FVAR) models to forecast nominal exchange rates for the EaP countries. This study provides better forecasts of nominal exchange rates than those produced by the random walk process.
KAVTARADZE, LASHA. "DINAMICS AND LATENT VARIABLES IN APPLIED MACROECONOMICS". Doctoral thesis, Università Cattolica del Sacro Cuore, 2016. http://hdl.handle.net/10280/16793.
Texto completo da fonteThe Ph.D. thesis consist of three chapters on evaluating inflation dynamics in Georgia and modeling and forecasting nominal exchange rates for the European Eastern Partnership (EaP) countries using modern applied econometric techniques. In the first chapter, we survey of models those produce high predictive powers for forecasting exchange rates and inflation. This survey reveals that the factor-based and time-varying parameter (TVP) models generate superior forecasts relative to all other models. In the second chapter, we study inflation dynamics in Georgia using a hybrid New Keynesian Phillips Curve (NKPC) nested within a time-varying parameter (TVP) framework. Estimation of a TVP model with stochastic volatility shows low inflation persistence over the entire time span (1996-2012), while revealing increasing volatility of inflation shocks since 2003. Moreover, parameter estimates point to the forward-looking component of the model gaining importance following the National Bank of Georgia (NBG) adoption of inflation targeting in 2009. In the third chapter, we construct Factor Vector Autoregressive (FVAR) models to forecast nominal exchange rates for the EaP countries. This study provides better forecasts of nominal exchange rates than those produced by the random walk process.
FONSECA, DIEGO AGUIAR. "PREDICABILITY DINAMICS IN BRAZILIAN CALL OPTIONS IMPLIED VOLATILITY SURFACES". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2013. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=34665@1.
Texto completo da fonteO The present study aims to explore predictability in temporal dynamics regarding linear models of the implied volatility surfaces estimated for Brazilian stocks options. Previous results, by usual approach of fitting linear models linking implied volatility to time to maturity and moneyness, available for each cross-section of option contracts at a point in time, as in Dumas, Fleming and Whaley (1998), suggest that estimated parameters of such models are highly unstable over time. Therefore, this approach isn t capable of replicating various IVS s shapes, contrary to the empirical evidence of implied volatility varying with options strike price and date of expiration. Based on these evidences and in Heston and Nandi (2000), that exploit the information on path-dependency in volatility contained in the spot S&P 500 index, Gonçalves e Guidolim (2006) proposed a two-stage approach to modeling and forecasting the S&P 500 index options IVS. In the second-stage they model the dynamics of the cross-sectional first-stage coefficients by means of vector autoregression models. The contribution of this work is to apply the proposed model to the reality of the Brazilian stock options, incipient in terms of liquidity and trading horizon dimensions when compared to the U.S. market, adapting criterians to validate its applicability in this context in statistical and economical sense. The results demonstrate the superiority of this approach over comparable literature, but not the ability to generate abnormal profits in the presence of transaction costs in excess of the benchmark of the risk-free rate. This indicates adaptation to the market efficiency hypothesis.
Azevedo, Thaís Nícia. "Efeito da expansão do cultivo de cana-de-açúcar na composição da paisagem do estado de São Paulo". Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/41/41134/tde-15102013-140418/.
Texto completo da fonteLand use and land cover change causes a series of impacts on the environment. In Brazil, the first crop that started the land use land cover change was sugarcane. Since its introduction, the cultivation of sugarcane is changing the landscape in which it is inserted. Presently, the state of São Paulo is the biggest producer of sugarcane in the country, and had its landscape modified with greater intensity since deploying Proálcool in 1975. The history of land use and land cover change allows us to understand how the sugarcane expansion affects these landscapes. In this study, we evaluate how the sugarcane expansion affects the composition of the landscape from 1965 to 2010. For this, we mapped nine sampling units which represented the sugarcane dynamics in São Paulo during Proálcool for four dates: 1965, 1980, 1995 and 2010. We analyze the landscape dynamics and elaborate transition matrices for the units studied in three intervals: 1965-1980, 1980-1995 and 1995-2010. We assessed whether the occupation of Permanent Preservation Areas (PPAs) differs from areas outside of PPAs regarding preference for land conversion, regeneration and deforestation. The sugarcane expansion was characterized by loss of natural cover, especially in campo cerrado and cerradão, when they exist, and the substitution of pasture, class that more relented space to sugarcane. However, outside of PPAs, there was no preference for conversion of land use during the expansion of sugarcane, in other words, the sugarcane expanded more over pasture because this was the most dominant class in the landscape. In PPAs, there was a direction of the sugarcane expansion, especially in the last analyzed period in which the conversion of natural cover for sugarcane was avoided. The regeneration in the PPAs was higher than in areas outside of PPAs. Nevertheless the loss of natural vegetation occurred regardless of location. In all periods, the percentage of natural cover was less than 20% when sugarcane was the matrix of the landscape. These data confirm that the expansion of sugarcane during the Proálcool occurred disrespecting environmental legislation, both inside and outside of the PPAs. We conclude that the sugarcane expansion changed the landscape composition, significantly reducing natural areas and pastures. Despite the recent trend of slight recovery of natural areas in PPAs, it is necessary to stimulate this regeneration, either through environmental certification or effective implementation of the new Forest Code. These actions could help maintain natural areas and carrying out the conservation areas, seeking more favorable landscapes for biodiversity conservation and ecosystem services.
Cecconello, Moiseis dos Santos. "Modelagem Alternativa para dinamica populacional : sistemas dinamicos fuzzy". [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/306498.
Texto completo da fonteDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Matematica, Estatistica e Computação Cientifica
Made available in DSpace on 2018-08-06T00:52:59Z (GMT). No. of bitstreams: 1 Cecconello_MoiseisdosSantos_M.pdf: 5857057 bytes, checksum: 8dbb12018838608241de19781b99d3c2 (MD5) Previous issue date: 2006
Resumo: Neste trabalho utilizamos a teoria dos conjuntos fuzzy de duas maneiras distintas para a modelagem de dinâmica populacional como alternativa para a modelagem determinística: problema de valor inicial fuzzy e sistemas baseados em regras fuzzy. Apresentamos algumas das principais propriedades da solução de um problema de valor inicial fuzzy obtida por extensão de Zadeh do campo variacional determinístico ou do fluxo derterminístico. Elaboramos bases de regras para dinâmica populacional de espécies isoladas com crescimento inibido e espécies em interação do tipo competição, presa-predador e mutualismo. Além disso, estabelecemos alguns resultados sobre a existência e unicidade de estados de equilíbrio para sistemas p-fuzzy unidimensionais e bidimensionais. Experimentos computacionais são feitos para a validação dos resultados encontrados e modelos aqui propostos
Mestrado
Biomatematica
Mestre em Matemática Aplicada
Mickevičius, Giedrius. "Stochastinių sistemų funkcionavimo aproksimavimas Markovo modeliais". Master's thesis, Lithuanian Academic Libraries Network (LABT), 2007. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2007~D_20070816_144130-27932.
Texto completo da fonteApplication of numerical methods with approximation allows to extend a class of systems represented by Markovian processes under investigation compared with analytical methods. So a goal was stated to create algorithms for modeling stochastic systems approximating them by Markovian models. To reach this goal the following tasks were solved: Analyze possibilities to approximate stochastic systems’ models by Markovian models; Create a multipurpose software that would calculate stationary probabilities for given system described in an event-based language; Apply created software for models of service systems and stock valuation. Created software is universal and easy-to-use for anyone that has at least basic knowledge in C++ language. This software was applied for modeling of service systems, for description of share price variability as Markovian process and for option pricing.
Martins, Paulo Augusto de Oliveira. "Estudo de algoritmo de continuação aplicado a resposta não-linear em frequência". [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265001.
Texto completo da fonteDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
Made available in DSpace on 2018-08-16T11:31:00Z (GMT). No. of bitstreams: 1 Martins_PauloAugustodeOliveira_M.pdf: 56662402 bytes, checksum: d0d469664498e80bed0d21cef0f7f7ac (MD5) Previous issue date: 2005
Resumo: O objetivo deste trabalho é estudar a aplicação do método "arc-length" em funções de resposta em frequência não-lineares (RFs), para se obter principalmente regiões instáveis do caminho de equilíbrio da curva de receptância ?(?). Para isto, é necessário conhecer os vários procedimentos de continuação existentes com o intuito de se escolher o melhor método que executasse este objetivo. O procedimento "arc-length" tem que ser usado em conjunto com algum algoritmo para solução de sistema de equações não-lineares. Logo, é utilizado o procedimento de Newton-Raphson, devido a sua razão de convergência e confiabilidade. A não-linearidade assumida neste trabalho é obtida através de funções descritivas, sendo que, no modelo matemático, a não-linearidade pode ser acrescentada tanto na matriz rigidez quanto na matriz de amortecimento, e sua posição irá depender do tipo de função descritiva que se está utilizando. Para verificar a funcionalidade do método, implementou-se um procedimento gráfico mostrando em cada passo de iteração até sua convergência. Na equação do resíduo para o caso de impedância ou receptância, o parâmetro de frequência (?) é modificado para (??), pois (?) é o fator que relaxa a frequência. Já, os resultados deste trabalho obtidos com o método "arc-length" são apresentados graficamente, utilizando vários modelos, os quais são mostrados os casos lineares e não-lineares. Estes gráficos são comentados e analisados, e são mostradas as dificuldades encontradas. Os resultados deste trabalho são de grande importância para a validação do método proposto e também para trabalhos futuros, no qual este método pode ser empregado junto a outros que determinam soluções periódicas, no qual o "arc-length" pode ser utilizado para obter a estabilidade da resposta sistema
Abstract: The objective of this work is to study the applicability of the arc-length method in nonlinear frequency response (RF), mainly to obtain unstable regions of the receptance curve ?(?) following the equilibrium way. To do this, it is necessary to know the several path-following procedures with the intuit of choosing the best method to do this task. The arc-length procedure must be used together with some optimization algorithm, so that this solves the nonlinear system of equations. Therefore, the procedure used is Newton-Raphson, due to its convergence ratio and reliability, although others Newton methods can be used with this purpose. The nonlinearity assumed in this work is obtained through describing functions, this nonlinearity is increased in the stiffness matrix and damping matrix of the mathematical model. To verify the functionality of the method, a graphic procedure was implemented to show the convergence at each iteration step. In the equation of residue, for the case of impedance or receptance, the parameter of frequency (?) is modified for (??), because (?) is the factor that relaxes the frequency. The results obtained with the method are represented graphically using several models, which are treated for linear and nonlinear cases. These graphs are commented properly, analyzed and the difficulties are showed presented. The results of this work are of great importance to validate the proposed method and also for future works, in which this method can be used in conjunction to others that determine periodic solutions, in which the arc-length can be used to obtain the stability of the system
Mestrado
Mecanica dos Sólidos e Projeto Mecanico
Mestre em Engenharia Mecânica
Morales, Pinzón Tito. "Modelling and sustainable management of rainwater harvesting in urban systems". Doctoral thesis, Universitat Autònoma de Barcelona, 2012. http://hdl.handle.net/10803/117610.
Texto completo da fonteThis dissertation developed a model to evaluate technical, economic and environmental aspects of rainwater harvesting systems for domestic urban use. Different types of housing (semi-detached house and apartment house) and different systems (one single-house, apartment building and neighborhood) were analyzed. Then, scenarios of economic and environmental viability were found and specific sub-models were developed for use in the direct evaluation of a wide range of climatic conditions, prices and quality of mains water in different urban scales. The dissertation is prepared into five main parts and eight chapters. Part I. INTRODUCTION and METHODOLOGICAL FRAMEWORK APPLIED Part I is divided into two chapters. Chapter 1 introduces the general work presenting a comprehensive framework of water resources and their importance in the cities. This chapter includes the supply and renewability of water resources in some countries of the world, and the urban water demands and trends of future urban growth. Also it is shown a relationship of domestic consumption of mains water and the relationship between water and energy. Finally, the motivations and the objectives that led to this dissertation are presented. Chapter 2 presents the general methodology that was developed, giving a special emphasis on system modelling, economic analysis and environmental assessment. In addition, this chapter includes the systems and case studies included in the research and validation carried on the main model developed. Part II. MODELLING RAINWATER HARVESTING SYSTEMS Part II includes the Chapter 3. This chapter presents in detail the development of a simulation model of RWH systems, and its benchmarking against other existing softwares. This software is called Plugrisost as an acronym for pluvials, grey and sustainability. In addition, the chapter describes the determinants factors that led to its creation and the new features included to facilitate the comprehensive assessment of rainwater harvesting. Part III. SOCIAL ASPECTS, POTENTIAL SUPPLY AND ENVIRONMENTAL BENEFITS OF RAINWATER IN URBAN AREAS Part III is composed of two chapters. Chapter 4 presents a study of the potential of rainwater harvesting in countries in process of development taking as a case study in Colombia. Additionally, this study shows that some socioeconomic aspects may influence the potential to capture rainwater. Chapter 5 discusses the potential environmental impacts in the context of new neighborhoods in developing countries, taking as a case study in Colombia. This chapter presents models that can be applied in rapid environmental assessments in these scenarios. Part IV. MAIN FACTORS IN THE ECONOMIC AND ENVIRONMENTAL ANALYSIS Part IV is composed of two chapters. Chapter 6 analyzes the economic and financial viability and environmental impact of RWH systems taking as a case study in Spain. Models to asses economically and environmentally these systems are developed. Also, the determinants that affect these assessments are exposed. Chapter 7 is focused on analyzing the potential effect of water network quality in the economic and environmental analysis of RWH systems. Hardness of the water is the parameter analyzed over a broad range of urban conditions and different systems. Part V. CONCLUSIONS AND NEXT STEPS Part IV is composed of one chapter. Chapter 8 presents the overall findings of the dissertation in accordance with the stated objectives. It is also included future researches that may continue to be developed in RWH systems.
Baldrighi, Julia Maria. "Estudo temporal da dinâmica folicular e parâmetros endócrinos de novilhas taurinas, zebuínas e bubalinas, mantidas sob o mesmo manejo nutricional". Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/10/10131/tde-11072013-163610/.
Texto completo da fonteConsidering the impact that nutrition and environment have over reproduction, it is essential for the reproductive biotechnologies to analyze the reproductive cycle of bovine (taurine and zebu) and bubaline heifers at the same time and under the same nutritional management. Therefore, the objective of this work was to study the follicular dynamic of Holstein (n=15), Gir (n=11) and Buffalo (n=15) heifers kept under the same conditions. All heifers were housed at the Department of Animal Reproduciton, (CBRA/FMVZ/USP), Pirassununga Campus. Animals were pre-synchronized with two doses of prostaglandin F2α (PGF; Dcloprostenol, 150µg, IM), fourteen days apart (D0 = day of first ovulation). From D0, it was performed daily ultrasound scan of the ovaries to track follicular dynamics (follicles ≥ 3mm) until the occurrence of the second ovulation. After the second ovulation, the follicular dynamic was performed twice daily to detect the time of deviation of the first follicular wave. The response variables were analyzed by PROC GLIMMIX, SAS. No difference was found among the inter-ovulatory interval (22.3±0.65; 22.1±0.95; 23.8±0.63 days) for Holstein, Gir and Buffalo, respectively. Differences were present (P<0.05) in at least one of the genetic groups, Holstein, Gir and Buffalo, respectively, for number of follicular waves (2.6±0,17a, 3.4±0,24b, 2.8±0,11a waves), number of follicles recruited after first (26.1±1.7a, 66.2±15.9b, 22.7±1.91a follicles), and second ovulation (30.2±3.08a, 74.2±18.8b, 27.1±2.8a follicles), diameter of first wave DF (15.8±0.66a, 12.3±0.32b, 12.1±0.03b mm), diameter of second wave DF (11.8±0.73a, 9.4±0.52b, 10.6±0.31ab mm), diameter of ovulatory follicle (15±0.33a, 13.7±0.74ab, 13.5±0.46b mm), maximum diameter of CL (26.8±0,54a, 22.3±0.98b, 19.5±0.32c mm), maximum concentration of P4 during ovulatory cycle (7.7±0.33a, 8.0±0.85a, 5.3±0.28b ng/ml) and length (8.0±0.49a, 5.2±1.07b, 8.1±0.44a days) of first wave dominant follicle dominance. No differences were found among the breeds for the moment of deviation (1.8±0.15; 2.1±0.21; 1.8±0.18 days). However, Holstein heifers presented larger DF and SF diameter (FD: 7.9±0.33; FS: 7.0±0.27mm; P<0.05) at deviation when compared with Gir (DF: 7.0±0.32; SF: 6.2±0.28mm) and Buffalo (DF: 6.8±0.19; SF: 6.3±0.29mm). Analyzing other steroids, concentration of blood testosterone during the first 13 days of the cycle was similar for the bovine heifers and lower for the bubaline heifers. Blood insulin and IGF-I were also measured. Holstein and bubaline heifers shown smaller concentrations of insulin (4.1±0.67 mUI/ml, 6.0±0.52 mUI/ml, respectively) than Gir heifers (9.0±2.15 mUI/ml), and also, when grouping the data collected from luteal phase and follicular phase, the result shows that during the period of high P4, insulin concentrations are lower than during the period of high E2. No differences were found among bovine breeds for the IGF-I concentration in follicular fluid, but they were lower than the concentrations presented in the bubaline follicular fluid. The results herein presented show that heifers from different genetic groups (Bos taurus, Bos indicus and Bubalus bubalis), maintained at the same nutritional and environmental status, have different folliculogenesis and luteal growth, which are specific to its breed.
Gaudiešienė, Daiva. "AUKŠTESNIŲJŲ KLASIŲ MOKINIŲ STATUSO GRUPĖJE IR JO DINAMIKOS VEIKSNIŲ ANALIZĖ". Master's thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2009~D_20090827_134710-12811.
Texto completo da fonteThe status and its dynamics among class members in the school environment have been a variable phenomenon and attracting much attention. The personality status of senior schoolchildren in a class and social position in the society have been more or less clear and stable due to longer communication time in the group. Every day schoolchildren spend five or more hours together in the school, and because of that a system which may encourage or suppress the dynamics of the status is created. The problem of the Master‘s Paper has been formulated on the basis of earlier presented arguments that students of senior classes experience situations of leadership or rejection because of the influence of inner – class status and their dynamic factors. The object of the research: the status of senior class students in the group and the factors influencing its dynamics. The goal of the research: to analyze the comprehended and factual status of senior students in the class; to accomplish comparative analysis; to ascertain the opinion of respondents about the ways of increasing the status in the class. The task of the research: to detect psycho – pedagogical aspects and common features of the dynamics of the status of schoolchildren in a social group; to find out the distribution of senior schoolchildren according to the status in the group; to analyze the peculiarities of factual status of schoolchildren in the group; to make comparative analysis of factual and comprehended status of... [to full text]
DISCENDENTI, MARCO. "Secondary elliptic islands in a dynamical system close to hyperbolic". Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2010. http://hdl.handle.net/2108/1402.
Texto completo da fonteWe consider a one parameter family of symplectic maps that cross a non-uniformly hyperbolic situation into an elliptic one. We prove that there exists a set of values of the parameter such that the map has secondary elliptic islands.
Malta, Judson Augusto Oliveira. "Dinâmica fitogeográfica do Refúgio de Vida Silvestre Mata do Junco Capela/SE". Universidade Federal de Sergipe, 2012. https://ri.ufs.br/handle/riufs/5500.
Texto completo da fonteIn the present study has aimed to analyse the phytogeographic dynamic in The Refúgio de Vida Silvestre Mata do Junco (RVSMJ), located in Capela/Se district, with the main hypothesis that the current configuration of remnant forest comes from the historical construction of the society-nature relationship. For this, diverse methods and approaches was used as field studies, surveys, semi-structured interviews, and techniques of geoprocessing such as, photo-interpretation, terrain numerical model, thematic mapping, profiles of phytogeographic and using of soil, etc. The results allowed us to get the analysis correlating the phytogeographic dynamic with the geomorphology, topography and fragmentation. In this process, which we has mapped and characterized four tipologies of phytophysionomic platforms, namely, herbaceous, shrubby, arborescent and arboreal. It was also elaborated, a study of the landscapes units of RVSMJ based on correlation of the diverse thematic maps presented: soils, slope, hypsometric, climate, water resources, and specially the using of soil, geomorphology, and phytophysionomy and paths. The results show that RVSMJ is not a continuous forest along its entire length. He has different compositions phytogeographic with the presence of landscape units weakened due to the degradation and ownership of natural systems: at the top of the trays, the construction of roads, agriculture and housing; in part, by the development of erosion processes, and in the valley, by human interference that changed the characteristics of phytophysionomic composition.
No presente estudo teve-se por objetivo analisar a dinâmica fitogeográfica no Refúgio de Vida Silvestre Mata do Junco (RVSMJ), Capela/SE, tendo como hipótese que a atual configuração do remanescente florestal provém da construção histórica da relação sociedade-natureza. Para tanto, diversos métodos e abordagens foram utilizadas na pesquisa de campo, nos mapeamentos e em entrevistas semi-estruturadas. Além de técnicas de geoprocessamento, como: fotointerpretação, modelo numérico de terreno, mapeamentos temáticos, perfis fitogeográficos e de uso do solo etc. Os resultados nos permitiram chegar a análises correlacionando a dinâmica fitogeográfica com a geomorfologia, a topografia e a fragmentação florestal. Neste processo, foram mapeadas e caracterizadas quatro tipologias de estratos fitofisionômicos, a saber, herbáceo, arbustivo, arborescente e arbóreo. Foi elaborado, também, um estudo acerca das unidades de paisagens do RVSMJ, baseado na correlação dos diversos mapas temáticos apresentados: solos, declividade, hipsometria, clima, recursos hídricos e, principalmente, uso do solo, geomorfologia e fitofisionomias e caminhos. Os resultados demonstram que o RVSMJ não é uma floresta contínua ao longo de toda a sua extensão. Ele possui diferentes composições fitogeográficas com a presença de unidades de paisagem fragilizadas por conta da degradação e apropriação dos sistemas naturais: no topo dos tabuleiros, pela construção de estradas, agricultura e habitações; na vertente, pelo desenvolvimento de processos erosivos; e no vale, pelas derivações antropogênicas que modificaram as características da composição fitofisionômica.
Felippe, Filho Waldir Neme. "Aplicação de modelos teórico-computacionais para simulação do comportamento dinâmico de estruturas amortecidas através de materiais viscoelásticos". Universidade Federal de Juiz de Fora (UFJF), 2012. https://repositorio.ufjf.br/jspui/handle/ufjf/3523.
Texto completo da fonteApproved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-03-06T20:01:57Z (GMT) No. of bitstreams: 1 waldirnemefelippefilho.pdf: 1707784 bytes, checksum: 0148be9b0994a40385d221d87ca55f90 (MD5)
Made available in DSpace on 2017-03-06T20:01:57Z (GMT). No. of bitstreams: 1 waldirnemefelippefilho.pdf: 1707784 bytes, checksum: 0148be9b0994a40385d221d87ca55f90 (MD5) Previous issue date: 2012-02-14
FAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
O avanço da tecnologia de materiais e o desenvolvimento de novas técnicas de execução mais sofisticadas permitiram a construção de estruturas mais leves e com elevada capacidade portante. Este processo iniciado durante a revolução industrial se estende até os dias atuais e impôs a necessidade de se verificar, durante a fase de projeto, o comportamento dinâmico das estruturas, com poucas exceções. Apesar disso algumas estruturas apresentam grandes amplitudes de deslocamentos por experimentarem combinações de ações imprevistas. Esta situação indesejada acelera o processo de fadiga dos materiais e em determinadas situações impede o uso da estrutura e/ou equipamentos. Uma forma eficiente de se atenuar as vibrações de uma estrutura é através de sistemas passivos de controle de vibrações via materiais viscoelásticos. Neste sentido, este trabalho abordará o método GHM utilizado na modelagem numérica de materiais viscoelásticos no domínio do tempo via Método dos Elementos Finitos. Com o intuito de validar este método, alguns tipos de elementos finitos formulados através deste método são apresentados e suas respostas no domínio da frequência obtidas para uma determinada estrutura são comparadas com aquelas obtidas pela formulação clássica. São apresentados, também, alguns exemplos de aplicação deste método. São modeladas numericamente vigas sanduíche e um modelo de riser e as frequências naturais e taxas de amortecimento identificadas com os modelos numéricos são comparadas com aquelas identificadas através de ensaios experimentais.
Advances in materials technology and development of new sophisticated construction techniques allowed the construction of lighter structures and with high bearing capacity. This process started during the industrial revolution and extends to present days and imposed the necessity to check, along the design phase, the dynamic behavior of structures, with few exceptions. Despite that, some structures have large amplitudes of displacements under unexpected actions. This unwanted situation speeds up the fatigue of materials and in certain situations prevent the use of the structure and/or equipment. An efficient way to attenuate these vibrations is through passive vibration control systems with viscoelastic materials. In this sense, this work will address the GHM method used in numerical modeling of viscoelastic materials in time domain with Finite Element Method. In order to validate this method, some types of finite elements formulated using this method are presented and their responses in frequency domain obtained for a given structure are compared with those obtained by classical formulation. Are also outlined a few examples using this method. Sandwich beams and a riser model are modeled numerically and the natural frequencies and damping ratios identified with the numerical responses are compared with those identified through experimental tests.
Martins, Lucimara Ramos. "Estudo das estruturas de solvatação e das propriedades dinamicas de soluções aquosas de Li2C4O4 por simulações de dinamica molecular". [s.n.], 2000. http://repositorio.unicamp.br/jspui/handle/REPOSIP/248850.
Texto completo da fonteDissertação (mestrado) - Universidade Estadual de Campinas. Instituto de Quimica
Made available in DSpace on 2018-07-27T07:35:38Z (GMT). No. of bitstreams: 1 Martins_LucimaraRamos_M.pdf: 2648526 bytes, checksum: d8749fe9eaca09b97040893937751963 (MD5) Previous issue date: 2000
Mestrado
Martinelli, Claudia. "Identificazione dinamica del comportamento di un ponte storico ad arco a più campate in muratura". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15485/.
Texto completo da fonteDiniz, Michael Macedo 1987. "Abordagem fuzzy do teorema de Poincaré-Bendixson". [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/306457.
Texto completo da fonteDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Matemática, Estatística e Computação Científica
Made available in DSpace on 2018-08-20T11:41:06Z (GMT). No. of bitstreams: 1 Diniz_MichaelMacedo_M.pdf: 80124316 bytes, checksum: 747345bace3d8a8cc71d1af0819a9f2a (MD5) Previous issue date: 2012
Resumo: Nesta dissertação temos como objetivo principal, o estudo do Teorema de Poincaré- Bendixson em sistemas dinâmicos que utilizam a teoria dos conjuntos fuzzy para incorporar à estes, incertezas inerentes no processo de modelagem. Para isso, abordaremos os sistemas dinâmicos fuzzy através de duas vertentes. Primeiramente estudaremos o Teorema de Poincaré-Bendixson em sistemas de EDOs cuja condição inicial é fuzzy, estes sistemas são obtidos através da extensão de Zadeh aplicada à solução de uma equação diferencial. Nestes modelos consideremos apenas a condição inicial como sendo fuzzy. Como resultado, proporemos um teorema que sob certas condições, garante a existência de uma região de atração para o fluxo fuzzy. No último capítulo, trabalharemos com sistemas P-fuzzy contínuo. Inicialmente, apresentaremos condições suficientes para que um sistema P-fuzzy contínuo tenha solução única, dada uma condição inicial. Para sistemas que satisfazem essas condições, será enunciado o Teorema de Poincaré-Bendixson, que garantirá sob certas hipóteses, a convergência de uma solução de um sistema P-fuzzy para uma órbita periódica
Abstract: In this work, we have as a main goal, the study of the Poincaré-Bendixson Theorem in dynamic systems that uses fuzzy set theory to incorporate uncertainties in the modeling process. To do this, we treat the fuzzy dynamic systems in two diffent contexts. In first one, we study the Poincaré-Bendixson theorem for systems of ODEs whose initial condition is fuzzy. These systems are obtained by Zadeh's extension applied to the solution of a differential equation. For these models, we consider only the initial condition as being fuzzy. Moreover, we propose a theorem that guarantees the existence of a region of attraction for the fuzzy flow under certain conditions. In the last chapter, we will work with P-fuzzy continuous systems. Initially, we present sufficient conditions for a fuzzy Pcontinuous system which ensure the uniqueness of the solution, given an initial condition. For systems that satisfy those conditions, we state the Poincaré-Bendixson theorem, with additional hypotheses that guarantees, the convergence of a solution of a P-fuzzy system for a periodic orbit
Mestrado
Matematica Aplicada
Mestre em Matemática Aplicada
Felippe, Filho Waldir Neme. "Desenvolvimento de um modelo computacional para simulação do comportamento dinâmico de vigas sanduíche com camada viscoelástica amortecedora". Universidade Federal de Juiz de Fora (UFJF), 2016. https://repositorio.ufjf.br/jspui/handle/ufjf/3089.
Texto completo da fonteApproved for entry into archive by Diamantino Mayra (mayra.diamantino@ufjf.edu.br) on 2017-01-31T10:34:29Z (GMT) No. of bitstreams: 1 waldirnemefelippefilho.pdf: 5861193 bytes, checksum: 8e75fc60830c02857375c1b6cd363132 (MD5)
Made available in DSpace on 2017-01-31T10:34:29Z (GMT). No. of bitstreams: 1 waldirnemefelippefilho.pdf: 5861193 bytes, checksum: 8e75fc60830c02857375c1b6cd363132 (MD5) Previous issue date: 2016-08-25
As estruturas atuais de engenharia civil têm apresentado pronunciado comportamento dinâmico, impondo a necessidade de se veri car, durante a fase de projeto, este comportamento. Apesar dessas veri cações e das recomendações normativas, algumas estruturas apresentam grandes amplitudes de deslocamentos ao experimentarem combinações de ações imprevistas, sendo necessária a aplicação de um sistema para controle de vibrações. Uma forma e ciente de controle destas estruturas é através de sistemas passivos via materiais viscoelásticos (MVE). Modelos determinísticos são numerosos na literatura e conseguem aproximar relativamente bem o comportamento dinâmico de estruturas amortecidas via MVE. Esses modelos, porém, são incapazes de capturar as incertezas associadas, por exemplo, às propriedades mecânicas dos materiais. Uma forma para capturar essas incertezas é através da modelagem não determinística. Neste sentido, este trabalho discutirá a modelagem numérica dos MVE abordando alguns dos fatores que in uenciam o desempenho de modelos numéricos, estratégias para ajuste dos parâmetros que de nem o comportamento dependente da frequência desses materiais e apresentará uma proposta de um modelo não determinístico. Comparam-se as frequências naturais e taxas de amortecimento de vigas sanduíche identi cadas com os resultados obtidos com o modelo proposto e aqueles obtidos através de ensaios experimentais. Pretende-se com este modelo fornecer ao projetista, ao invés de um único valor para os parâmetros modais da estrutura e deslocamentos, uma representação probabilística.
The current civil engineering structures have shown pronounced dynamic behavior, imposing the need to check, during the design phase, this behavior. Despite these veri cations and normative recommendations, some structures experience large amplitudes of displacements under unexpected actions, then a vibration control system is required. An e cient way to control these structures is through passive vibration control systems with viscoelastic materials (VEM). Deterministic models are numerous in literature and they present fairly good approximations for the dynamics behavior of structures damped with VEM. These models however are unable to capture uncertainties associated, for instance, with the mechanical properties of materials. One way to capture these uncertainties is through non-deterministic models. Thus, this thesis discusses the numerical modeling of MVE addressing some of the factors that in uence the performance of numerical models, some strategies to adjust the parameters that de ne the frequency dependent behavior of these materials and present a proposal for a non-deterministic model. The aim of this model is provide to the designer, rather than a single value for the structures modal parameters and displacements, a probabilistic representation.
Mikalauskaitė, Irma. "Akcijų kainų dinamikos modelių tyrimas". Master's thesis, Lithuanian Academic Libraries Network (LABT), 2006. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2006~D_20060607_133834-54390.
Texto completo da fonteAmaral, Márcio Douglas Brito. "Dinâmicas econômicas e transformações espaciais: a metrópole de Belém e as cidades médias da Amazônia Oriental - Marabá (PA) e Macapá (AC)". Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/8/8136/tde-25082011-152703/.
Texto completo da fonteThis research has as central goal to contribute to the knowledge of the relation between metropolis and medium sized city, considering the analysis of the recent changes in the relation stablished between the metropolitan Belem and the medium sized cities of oriental Amazon Maraba (southeast of Para) and Macapa (capital of Amapa State). Different authors and institutions have dedicated in the last years to the understanding of this modification in the relation between Belem and the cities of the Amazonian region. The main hypothesis which they defend is that Belem has lost regional importance and, in some cases, its role of metropolis is questioned or by the increasing of regional metropolises, such as Manaus and São Luis, or by the major presence of extra regional metropolises, such as Goiania, Brasilia and São Paulo, in spaces that were commanded hegemoniacally by Belem. In this thesis it is defended which the basis of this hypothesis of these authors and institutions and of their argumentative scheme is of pyramidal basis and it is grounded in a metric vision of the territories. It is argumented which there was a change of the relation stablished between the metropolitan Belem and the medium sized cities of oriental Amazon, mainly because of the diffuse form with the public and private investments occurred in the region, promoting the passage of the simple urbanization of the population to the urbanization of the territory, although it is believed that this change did not mean lost of importance of the metropolis in this region. What occured was a transformation in the nature of the relation between metropolis and the region, because some cities begin to develop the role of the medium sized cities and to stablish relations in which the mediation sometimes is not developed by the regional metropolis, allowing a discussion about the metropolization of the space. Concluding, it is possible to say which the relation between the metropolitan Belém and the medium sized cities of Marabá and Macapá must be understood in the apices of this process of concentration and centralization of the capital which took the country and which restructured all its urban dynamics, in the horizontal and vertical plans.
Benedetti, Luca. "Studio degli effetti dinamici negli impalcati da ponte ad uso stradale causati dal transito di veicoli". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
Encontre o texto completo da fonteBonella, Katia. "L'attrito dinamico". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amslaurea.unibo.it/2532/.
Texto completo da fonteTeixeira, Antonio Cesar. "Detecção e diagnostico de falhas em sistemas de processos quimicos. Importancia do conhecimento de estados intermediarios de processos dinamicos. Desenvolvimento de uma metodologia baseada em redes neurais". [s.n.], 2000. http://repositorio.unicamp.br/jspui/handle/REPOSIP/267640.
Texto completo da fonteTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica
Made available in DSpace on 2018-07-27T02:32:27Z (GMT). No. of bitstreams: 1 Teixeira_AntonioCesar_D.pdf: 10706432 bytes, checksum: 6751ec412833a32b317b83af03ed2fe0 (MD5) Previous issue date: 2000
Resumo: Redes Neurais Artificiais (RNA) têm demonstrado um excelente desempenho em detecção e diagnóstico de falhas em muitas aplicações de engenharia. O grande problema quando se usa redes neurais está no fato de qua as redes somente funcionam bem para dados para os quais foi treinada. Isto significa que é necessário usar tantos dados quantos possíveis a fim de se cobrir uma larga faixa de condições operacionais do processo. Muitos dos trabalhos publicados em detecção de falhas estãor relacionados ao comportamento no estado estacionário, e o presente trabalho leva em conta a dinâmica do processo na detecção e diagnóstico de falhas. Um sistema computacional eficiente, baseado em redes neurais com Funções Base Radiais, foi desenvolvido para analisar a influência do comportamento dinâmico de plantas químicas complexas para detectar e diagnosticar falhas. A retropropagação usando a regra delta generalizada (RDG) para o cálculo do gradiente para o treinamento de RNA's não é conveniente para sistemas com grande quantidade de dados. Foi proposta também uma metodologia a qual permite agrupar dados para o estudo e análise de sistems complexos, o que permite a detecção e o diagnóstico em grandes sistemas
Abstract: Artificial Neural Networks (ANN) have demonstrated excellent performance in automatic fault detection and diagnosis in many engineering applications. The great problem when using neural networks, is that neural networks perform only as robustly as the data from which they are trained. This means that is necessary to use as much data as possible in order to cover the wider range of possible operational conditions of the processo Most of the published work on fault detection are related to steady state behavior, and the present work was undertaken to study the process dynamics effects on fault detection. A computational system based on neural networks was developed to analyze the influence of the dynamic behavior of a complex chemical plants to detect and to diagnose faults. An efficient artificial neural network which may be trained through large data sets has also been developed. Although backpropagation using a generalized delta mIe (GDR) for gradient calculation has been popularized as a method of training ANN, it is clear that that this methodology is unsuitable for large data systems. For large data systems we found the great efficiency of neural networks using Radial Basis Functions. Finally, is proposed a methodology which permits to group data from simple lumped systems to study and analyze complex systems which makes possible the detection and diagnosis of the large set of possible of fauIts
Doutorado
Sistemas de Processos Quimicos e Informatica
Doutor em Engenharia Química
Garimberti, Giovanni. "Modellazione dinamica di sistemi per il recupero termico di sorgenti a bassa entalpia". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
Encontre o texto completo da fonteMejía, Calderón Luz Adriana. "Metodología para la identificación de parámetros dinámicos en sistemas mecánicos de baja movilidad: Aplicación a una suspensión de vehículo automóvil". Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/62352.
Texto completo da fonte[ES] Resumen Conocer los parámetros dinámicos de los sistemas mecánicos es indispensable en diferentes aplicaciones, particularmente en las tareas de simulación y control. En el Departamento de Ingeniería Mecánica y Materiales de la Universidad Politécnica de Valencia se ha trabajado durante varios años en identificación de parámetros dinámicos de robots serie y paralelo. Con la presente tesis se pretende continuar con el proceso de identificación de parámetros dinámicos, ahora sobre otro tipo de sistemas mecánicos. Teniendo en cuenta que la gran mayoría de mecanismos que conforman los sistemas y las máquinas son de cadena cinemática cerrada, en este trabajo se analizan las metodologías de identificación existente y se plantea una nueva metodología de identificación para cuando la cadena cerrada es de baja movilidad. Una vez obtenido el modelo dinámico como sistema lineal respecto a los parámetros dinámicos, se determina un modelo en parámetros base que puede ser resuelto a través de métodos numéricos como mínimos cuadrados. La determinación de este modelo en parámetros base depende de las relaciones de dependencia lineal que se tienen entre los parámetros dinámicos. Estas relaciones, y por tanto, los conjuntos de parámetros base pueden obtenerse a través de metodologías simbólicas y numéricas. En esta tesis se aplica la metodología estándar de identificación a partir de la descomposición en valores singulares, y una metodología simbólica a partir del concepto de trasferencia de propiedades inerciales, para obtener modelos en parámetros base. Las ventajas de aplicar métodos simbólicos sobre los numéricos son evidenciadas y corroboradas con la aplicación de ambas metodologías sobre una cadena cerrada de baja movilidad como lo es la suspensión de un vehículo automóvil. Como los modelos en parámetros base presentan altos condicionamientos numéricos que los hacen impropios para tareas de identificación, se busca disminuir esta característica reduciendo el modelo. Para ello, se aplica como criterio el ordenamiento dado por el índice de contribución dinámica de cada parámetro. Este índice da cuenta del efecto del parámetro sobre las fuerzas generalizadas del sistema. El criterio de reducción aplicado requiere de una aproximación inicial de los parámetros dinámicos. Se ha podido comprobar que la utilización de este criterio no se ve afectada significativamente por la aproximación utilizada cuando se conocen las expresiones simbólicas de los parámetros base. Tal es el caso de los modelos obtenidos por transferencias inerciales. La comparación entre los diferentes modelos elaborados, permiten afirmar que los modelos obtenidos a través de los métodos simbólicos presentan menores errores de predicción y son poco sensibles a la aproximación inicial.
[CAT] Resum Coneixer els parametros dinamics dels sistemes mecanics es indispensable en diferents aplicacions, particularment en les tasques de simulació i control. En el Departament d'Ingenieria Mecanica i Materials de l'Universitat Politecnica de Valencia s'ha treballat durant varis anys en identificació de paràmetres dinàmics de robots serie i paralel. En el present TESIS es pretén continuar en el proces d'identificació de paràmetres dinámics, ara sobre atre tipo de sistemes mecanics. Tenint en conte que la gran majoria de mecanismes que conformen els sistemes i les maquines son de cadena cinematica tancada, en este treball s'analisen les metodologies d'identificació existent i se planteja una nova metodologia d'identificació per a quan la cadena tancada es de baixa movilitat. Despres d'obtingut el model dinàmic com sistema llinial respecte als paràmetres dinàmics, se determina un model en paràmetres base que pot ser resolt a través de metodos numerics com minims quadrats. La determinació d'este model en paràmetres base depen de les relacions de dependencia llinial que se tenen entre els paràmetros dinàmics. Estes relacions, i per tant, els conjunts de paràmetres base poden obtindre's a través de metodologies simboliques i numeriques. En este treball s'aplica la metodologia estandart d'identificació a partir de la descomposició en valors singulars, i una metodologia simbolica a partir del concepte de transferencia de propietats inerciales, per a obtindre models en paràmetres base. Les ventages d'aplicar metodos simbolics sobre els numerics son evidenciades i corroborades en l'aplicació d'abdos metodologies sobre una cadena tancada de baixa movilitat com ho es la suspensió d'un vehicle automovil. Com els models en paràmetres base presenten alts condicionaments numerics que els fan impropis per a tasques d'identificació, se busca disminuir esta caracteristica reduint el model. Per a aixó, s'aplica com criteri l'ordenament donat per l'index de contribució dinàmica de cada paràmetre. Este index dona conte de l'efecte del paràmetre sobre les forces generalisades del sistema. El criteri de reducció aplicada requerix d'una aproximació inicial dels paràmetros dinàmics. S'ha pogut comprovar que l'utilisació d'este criteri no se veu afectada significativament per l'aproximació utilisada quan se coneixen les expressions simboliques dels paràmetres base. Tal es el cas dels models obtinguts per transferencies inerciales. La comparança entre els diferents models elaborats, permeten afirmar que els models obtinguts a través dels metodos simbòlics presenten menors erros de predicció i son poc sensibles a l'aproximació inicial.
Mejía Calderón, LA. (2016). Metodología para la identificación de parámetros dinámicos en sistemas mecánicos de baja movilidad: Aplicación a una suspensión de vehículo automóvil [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/62352
TESIS
Kotze, Etna. "'n Spelterapieprogram vir die adolessente dogter wat seksueel misbruik is". Thesis, Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-12132006-145617.
Texto completo da fonteMancino, Antonio. "Dinamica dei fluidi". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9084/.
Texto completo da fonteLa, Bella Noemi. "Dinamica dei fluidi". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14683/.
Texto completo da fonteSimonte, Marco. "Dinamica dei fluidi". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16348/.
Texto completo da fonteSilvi, Karin. "Dinamica dei fluidi". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/17074/.
Texto completo da fonteCantarella, Sebastiano. "Dinamica dei fluidi". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19504/.
Texto completo da fonteBruhns, Heloisa Turini. "A dinamica ludica". [s.n.], 1989. http://repositorio.unicamp.br/jspui/handle/REPOSIP/253062.
Texto completo da fonteDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Educação
Made available in DSpace on 2018-07-13T21:33:05Z (GMT). No. of bitstreams: 1 Bruhns_HeloisaTurini_M.pdf: 5180743 bytes, checksum: 46bbc4c87541c38f380e19fa7e1ce2fb (MD5) Previous issue date: 1989
Resumo: Este trabalho refere-se a uma abordagem teórico-histórica do jogo. Tem como tema central a diferenciação entre jogo e esporte, tentando demonstrar através dos fatos históricos e sua interpretação, a relação da atividade esportiva (esporte profissional), com a racionalidade do sistema produtivo e o jogo como uma atividade que, de cet forma, contradiz essa mesma racionalidade por não voltar-se para a produção e o consumo
Mestrado
Mestre em Educação
Grassi, Matilde. "Dinamica dei fluidi". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/24835/.
Texto completo da fonteNativi, Lorenzo. "Dinamica dei fluidi". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7208/.
Texto completo da fonteConceição, Samuel Vieira. "Programação dinamica difusa". reponame:Repositório Institucional da UFSC, 1989. https://repositorio.ufsc.br/xmlui/handle/123456789/157566.
Texto completo da fonteMade available in DSpace on 2016-01-08T16:14:09Z (GMT). No. of bitstreams: 1 83701.pdf: 1884301 bytes, checksum: e03d547fdf2f74be3aa8266c4d26f22f (MD5) Previous issue date: 1989
A programação dinâmica é uma técnica de pesquisa operacional muito utilizada para resolver problemas de economia, engenharia, planejamento e controle da produção, entre outros, que sejam modelados de forma precisa. Com o surgimento da teoria dos conjuntos difusos, foi possível proporcionar ferramentas matemáticas mais adequadas ao tratamento dos problemas que envolvessem incertezas e/ou conceitos imprecisos. O presente trabalho apresenta uma técnica que concatena a teoria dos conjuntos difusos e programação dinâmica, com o objetivo de resolver problemas de programação dinâmica definidos a partir de parâmetros imprecisos e/ou subjetivos. após o desenvolvimento da técnica, faz-se uma aplicação da mesma, para um problema de expansão de linhas de produção, e para um problema de marketing, caracterizando os casos de programação dinâmica determinística difusa e programação dinâmica estocástica difusa, respectivamente.
Serino, Sergio. "Dinâmica e estabilidade em um modelo para populações de ostras". Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/100/100132/tde-01062017-120551/.
Texto completo da fonteThe objective of this work is to study the occurrence of regime shifts that are typical in the behavior of complex systems, in particular in the context of applied dynamical systems. Accordingly, we have developed a mathematical model that represents the interaction between a culture of oysters used for human consumption and the eutrophication and bioremediation processes of the ecosystem containing the culture. The interactions between the oyster populations and the phytoplankton between themselves and with the suspended matter, that appears as a by-product of the relationship between the components of the medium and its eutrophication process, change the oxygenation levels and the resulting water quality due to the realization of a greater or lesser amount of photosynthesis by the vegetation of the deeper levels. In this paper we propose a dynamical system of three variables to model the system and analyze its points of equilibrium using two techniques, the Quirk-Ruppert method and the Routh-Hurwitz criteria, besides solving the equations numerically for a realistic phenomenological) set of parameters obtained from the literature. Our results indicate that the daily extraction threshold that can be achieved without collapsing the culture of oysters amounts to approximately 4.8% of the total population
Guerrero, Zurita Grace. "Dynamique territoriale dans les petits cantons en Equateur : Etude comparative de 4 cantons de 20000 à 50000 habitants". Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALH003.
Texto completo da fonteThe thesis examines the territorial dynamics of four small cantons of Ecuador with populations ranging from 20,000 to 50,000 people. There is a great disparity between cantons in the country; small cantons generate little production and are the poorest ones. Consequently, research into the factors that cause territorial dynamics in small cantons and can enhance territorial development processes is crucial.Two coastal cantons (Jama and Montalvo) and two highlands’ cantons (Cotacachi and Baños) were researched. The cantons were selected from a total of 221, based on their rate of population growth between the 2001 and 2010 censuses: Two surpass the national average in terms of population growth, two have slower growth rates than the national average. The territories have significant differences in terms of their economic and institutional conditions.The study of territorial dynamics is an understudied topic in cantonal planning processes, despite its importance in each canton's distinctive territorial development commitment. This absence gave rise to the following research question: What are the factors that might explain disparities in territorial development dynamics in small cantons?And the hypothesis: The factors that explain differences in territorial development dynamics in small cantons include demographic, economic, and related to the importance of small cities, social capital, and institutionality.As a conclusion, the four factors generate distinct dynamics in the cantons. Complexity is an appropriate framework for the study of territories because of the linkages of numerous factors that result in distinct territorial dynamics. According to this perspective, territories are complex systems which in turn, links factor subsystems. Finding the factors that stimulate these dynamics - unique to each territory - allows for the implementation of developmental efforts that break the cycle of poverty and depopulation.The interdependence of the studied four factors reflects the transformations and changes that imply the well-being of the inhabitants of the territory. The factors studied interact with one another; the economic sector has an impact on the demographic factor, population growth and migration; the small city plays a role in the generation of an economic and social dynamic of the territory and is essential within it because it dynamizes markets, functions, institutions, flows of goods and services, trade, installed infrastructure, and cultural activities; and the rural-urban relationship determines a conformation that influences the economic dynamics; finally, social capital explain dynamics of territorial development in just one canton.This is a mixed-methods study that allows the researcher to investigate several territorial issues within small cantons, using not only a quantitative approach but also appreciating the perspectives of the population, forming a triangle, and meeting various interests and representations
Giannotti, Daniel. "Diagnosi energetica del complesso PEEP di Corticella tramite simulazioni in regime dinamico: analisi e sviluppo di indicatori energetici". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
Encontre o texto completo da fonteBeninca, Arianna. "Dinamica dei corpi rigidi". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10158/.
Texto completo da fonteBosi, Marco. "Modelli dinamici di geodinamo". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/12062/.
Texto completo da fonteSotira, Stefano. "Dinamica dei sistemi collisionali". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/17110/.
Texto completo da fonteGiusti, Camilla. "Dinamica dei sistemi collisionali". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21221/.
Texto completo da fonteOttalevi, Gabriele. "Dinamica dei sistemi collisionali". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23936/.
Texto completo da fonteTommarelli, Ester. "Dinamica dei sistemi collisionali". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/24826/.
Texto completo da fonteValentini, Maria Letizia. "Dinamica dei sistemi collisionali". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amslaurea.unibo.it/25167/.
Texto completo da fontePizzuto, Luca. "Dinamica dei sistemi collisionali". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23682/.
Texto completo da fonteTempesta, Alberto. "Comportamento dinamico dell'arco fessurato". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2008. http://amslaurea.unibo.it/126/.
Texto completo da fonteCeccaroni, Luca. "Elettrocardiografia dinamica: evoluzione tecnologica". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/4843/.
Texto completo da fontePaula, Gilberto Luiz de Souza. "Modelos de Ising dinamico". reponame:Repositório Institucional da UFSC, 1994. http://repositorio.ufsc.br/xmlui/handle/123456789/76170.
Texto completo da fonteMade available in DSpace on 2012-10-16T07:56:41Z (GMT). No. of bitstreams: 0Bitstream added on 2016-01-08T18:59:08Z : No. of bitstreams: 1 96497.pdf: 1094541 bytes, checksum: cb7b6164b0d0951706f97e2c507d68c1 (MD5)
Nesta dissertação estudamos o comportamento dinâmico de dois modelos ferromagnéticos através da equação mestra. No primeiro deles consideramos o modelo de Ising num gradiente de temperatura e determinamos os estados estacionários através das prescrições de Metropolis e Glauber. Mostramos que na ausência de correlações os estados estacionários são diferentes, enquanto que levando-se em conta correlações entre primeiros vizinhos os estados estacionários são os mesmos. No segundo modelo, determinamos o diagrama de fases do modelo de Ising dinâmico em um campo aleatório na situação estacionária. Mostramos que os estados estacionários coincidem com os de equilíbrio para todo o espaço de parâmetros com exceção das vizinhanças das transições de primeira ordem.
Caravita, Alessandro. "La dinamica del corpo rigido: dalle equazioni cardinali della dinamica alle equazioni di Eulero". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18424/.
Texto completo da fonteDi, Giovanni Marco. "Proprietà statistiche di network dinamici". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9418/.
Texto completo da fonte