• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 50
  • 43
  • 10
  • 10
  • 9
  • 4
  • 2
  • 2
  • 2
  • 2
  • 1
  • 1
  • 1
  • 1
  • 1
  • Tagged with
  • 155
  • 28
  • 19
  • 17
  • 17
  • 15
  • 15
  • 12
  • 12
  • 12
  • 11
  • 10
  • 9
  • 9
  • 9
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
101

Developmental patterns of Spanish grammatical morphemes and mean length of utterance in bilingual children

Lovgren-Uribe, Samantha Doline 22 November 2013 (has links)
The purpose of this analysis was to define norms for grammatical morpheme development in Spanish for Spanish-English bilingual children ages 4;0-7;6. This study uses secondary data analysis based on two existing datasets. Participants included 334 Spanish-English bilingual children that were recruited from school districts in Texas, Utah, and Pennsylvania. Grammatical morpheme accuracy was determined by performance on the BESA (Bilingual English Spanish Assessment) (Peña, Gutiérrez-Clellen et al., in preparation). Mean length of utterance in words (MLUw) data was collected from language samples. The average percent accuracy of grammatical morphemes was calculated and analyzed as a function of MLUw in Spanish. Results show that the percentage of accurately produced morphemes has a general upward trend as MLUw increases. Clinical and research implications are discussed. / text
102

Mokomasis CD pradinukui: tipinių veiklos scenarijų realizavimas / Educational CD for Primary Learners: Implementation of Typical Learning Scenarios

Tyliutė, Laima 27 August 2009 (has links)
Mokomasis CD tipiniai veiklos scenarijai sukurti remiantis pakartotino panaudojimo koncepcija. Teorinėje dalyje atlikta mokomųjų CD, naudojamų ugdymo procese, analizė, aiškintasi pakartotino panaudojimo koncepcija, susipažinta su šablonais – komponentais ir jų taikymu MO (mokymo objektuose). Praktinėje dalyje aprašomas sukurtas mokomasis CD ir jo komponentai, veikimo principas, pateikiami testavimo rezultatai. Šis darbas parengtas naudojantis Adobe Flash CS 3 technologijas, naudojant Action Script 2. / Educational CD with action script realization was created on the basis of re-creating the concept of recovery. Theoretical part of this work includes the analysis of the CD use in teaching and educational processes. It also includes the analysis of the concept of re-use and getting familiar with the pattern of the application of TO (teaching objects). The practical part of the work describes the developed educational CD and its components, operating principle and the test results. This work is based on Adobe Flash CS 3 technology, using Action Script 2.
103

[en] SOLAR RADIATION RESOURCE ASSESSMENT FOR RIO DE JANEIRO, BRAZIL / [pt] AVALIAÇÃO DA DISPONIBILIDADE DO RECURSO SOLAR NO ESTADO DO RIO DE JANEIRO

FIORELLA DEL CARMEN ALVARO CABRERA 23 November 2018 (has links)
[pt] O potencial da energia solar para a geração de energia elétrica no mundo é sem dúvida o maior dos potenciais das fontes energéticas renováveis, com uma capacidade de produção de eletricidade estimada em 745,8 TWh por ano. Embora não seja responsável por uma parte significativa da matriz elétrica mundial, o crescimento do setor fotovoltaico no mundo é notável. A capacidade instalada mundial de centrais fotovoltaicas cresceu 39 por cento no ano 2013. Os mapas mundiais de radiação solar mostram que aqueles que mais investem em energia solar fotovoltaica não são necessariamente aqueles cujo território recebe a maior quantidade deste recurso. O Brasil, com um grande potencial solar, confirmado por diversos levantamentos, não é um dos principais produtores de eletricidade a partir de sistemas fotovoltaicos. Este setor no Brasil é ainda incipiente, porém, uma das estratégias do país para promover a implementação de sistemas fotovoltaicos é um mecanismo de net metering para mini e micro produtores. Diversos especialistas afirmam que esta estratégia poderia gerar um grande volume de empreendimentos em pequena e média escala nos próximos anos. Este trabalho fornece uma ferramenta de informação sobre a radiação solar no estado do Rio de Janeiro, conformada por mapas de radiação solar global e dados de anos meteorológicos típicos. Com base nos dados gerados, realizaram-se simulações para estimar a radiação solar incidente e a eletricidade produzida por painéis fotovoltaicos em diferentes configurações fixas e com rastreamento. Avaliaram-se os ganhos e perdas ocasionados por cada configuração em relação a configuração horizontal. / [en] Solar energy potential for electricity generation undoubtedly surmounts the potential of all the other renewable energy sources, with an estimated electricity production capacity of 745.8 TWh per year. Albeit solar energy does not account for a significant share of the world electricity matrix, the growth of the photovoltaic market in the world is remarkable: the installed PV capacity increased in 39 percent on 2013. Nevertheless, the world maps of solar radiation show that the countries that invest the most in solar photovoltaic energy are not necessarily the ones that receive the highest solar radiation. Brazil, with an important solar potential, confirmed by diverse assessments, is not one of the main producers of PV-generated electricity. The PV-market in Brazil is still immature, however, one of the strategies of the Government to promote the implementation of PV systems is a net metering mechanism for mini and micro producers. Different specialists claim that this strategy could generate a big volume of new endeavors in small and medium scale in the next years. This study provides information tools about solar radiation in Rio de Janeiro. It comprises maps of global solar radiation in horizontal surfaces and Typical Meteorological Year data sets. Simulations were performed based on the generated data to estimate the incident solar radiation and the electricity produced by PV systems in different fixed and tracking configurations. The gains and losses caused by each configuration with respect to the horizontal configuration were evaluated.
104

Analysis of the Impact of Urban Heat Island on Energy consumption of Buildings in Phoenix

January 2011 (has links)
abstract: The Urban Heat Island (UHI) has been known to have been around from as long as people have been urbanizing. The growth and conglomeration of cities in the past century has caused an increase in the intensity and impact of Urban Heat Island, causing significant changes to the micro-climate and causing imbalances in the temperature patterns of cities. The urban heat island (UHI) is a well established phenomenon and it has been attributed to the reduced heating loads and increased cooling loads, impacting the total energy consumption of affected buildings in all climatic regions. This thesis endeavors to understand the impact of the urban heat island on the typical buildings in the Phoenix Metropolitan region through an annual energy simulation process spanning through the years 1950 to 2005. Phoenix, as a representative city for the hot-arid cooling-dominated region, would be an interesting example to see how the reduction in heating energy consumption offsets the increased demand for cooling energy in the building. The commercial reference building models from the Department of Energy have been used to simulate commercial building stock, while for the residential stock a representative residential model prescribing to IECC 2006 standards will be used. The multiyear simulation process will bring forth the energy consumptions of various building typologies, thus highlighting differing impacts on the various building typologies. A vigorous analysis is performed to see the impact on the cooling loads annually, specifically during summer and summer nights, when the impact of the 'atmospheric canopy layer' - urban heat island (UHI) causes an increase in the summer night time minimum and night time average temperatures. This study also shows the disparity in results of annual simulations run utilizing a typical meteorological year (TMY) weather file, to that of the current recorded weather data. The under prediction due to the use of TMY would translate to higher or lower predicted energy savings in the future years, for changes made to the efficiencies of the cooling or heating systems and thermal performance of the built-forms. The change in energy usage patterns caused by higher cooling energy and lesser heating energy consumptions could influence future policies and energy conservation standards. This study could also be utilized to understand the impacts of the equipment sizing protocols currently adopted, equipment use and longevity and fuel swapping as heating cooling ratios change. / Dissertation/Thesis / M.S. Architecture 2011
105

Some Relevant Aspects of Mining Taxes in Peru. Interview with Dr. Fernando Zuzunaga del Pino / Algunos Aspectos Relevantes de la Tributación Minera en el Perú. Entrevista al Dr. Fernando Zuzunaga del Pino

Alva Cruz, Josselyn Estefanía, Becerra Mejía, Janibeth Amelia 10 April 2018 (has links)
This interview aims to expose some relevant aspects of the mining taxes in our country. First, the discussion goes around the typical contracts of mining concessions and their relation with mining royalty and income tax, to then analyze the regulation of and anticipated recovery that looks to be an incentive for mining activity.Finally, the role of the right of effectiveness fee and mining royalty of mining concessions are analyzed, so are the consequences of this two in the mining sector. / La presente entrevista busca exponer algunos aspectos relevantes de la tributación minera en el país. Así, se parte del caso de los contratos típicos de las concesiones mineras y su relación con la Regalía Minera y el Impuesto a la Renta, para luego analizar los regímenes de devolución definitiva y recuperación anticipada, con miras al incentivo de la actividad minera.Finalmente, se analizará el rol del derecho de vigencia y la regalía minera de las concesiones mineras, así como las implicancias de las mismas en el sector.
106

Les notions de contrat d'assurance / The notions of insurance contract

Haddad, Eloïse 11 December 2017 (has links)
Le contrat d'assurance bénéficie d'un régime spécifique, énoncé dans le code des assurances. Néanmoins il ne fait l'objet d'aucune définition législative. Or, comme la mise en œuvre d'un régime dépend de l'opération de qualification et que les entreprises d'assurance sont astreintes à un principe de spécialité, l'identification des éléments constitutifs de la catégorie est une nécessité. Jusqu'à présent, ni la jurisprudence, ni la doctrine n'ont apporté de définition pleinement convaincante. En effet, s'il existe un consensus pour définir le contrat d'assurance comme une convention dans laquelle une partie garantit un risque en échange du paiement d'une prime, il demeure que les notions de risque et de garantie suscitent de nombreuses interrogations. La qualification du contrat d'assurance implique de définir en premier lieu la notion conceptuelle de ce contrat, élaborée à partir de sa cause typique. Elle implique de préciser la cause des contrats aléatoires, ainsi que d'éclairer le contenu de la notion de garantie, notion complexe qui renvoie à la mutualisation des risques. Par ailleurs, il existe des situations dans lesquelles le régime du contrat d'assurance est appliqué à d'autres contrats, en raison de choix politiques. Il existe donc des notions fonctionnelles de contrat d'assurance. Ainsi, les entreprises d'assurance souscrivent des contrats de pari qui échappent à l'exception de jeu car ils servent une fonction de garantie. De plus, depuis 2004, le régime de faveur en matière fiscale et patrimoniale réservé aux contrats d'assurance-vie est applicable aux contrats commutatifs d'épargne souscrits auprès des entreprises d'assurance. / The insurance contract has a dedicated regime, described in the insurance code. Nevertheless, it has no legal definition. However, as the implementation of a regime depends on the qualification, and the insurance companies are bound by a principle of specialty, an identification of the elements constituting the category of the insurance contract is needed. Nevertheless, neither jurisprudence nor doctrine has provided a fully convincing definition. Indeed, while there is consensus that the insurance contract should be defined as an agreement in which a party guarantees a risk in exchange for the payment of a premium, the fact remains that the notions of risk and guarantee raise many questions. Undertaking the qualification of the insurance contract implies first defining the conceptual notion of this contract, developed based on its typical cause. It involves detailing the cause of aleatory contracts, as well as clarifying the content of the notion of guarantee, a complex notion that refers to the risk-pooling technique. In addition, there are some situations in which the regime of the insurance contract is applied to conceptually distinct contracts because of political choices. There are therefore functional notions of insurance contract. Indeed, insurance companies subscribe to gambling contracts which escape the gambling exclusion because they serve as a guarantee. Moreover, since 2004, the preferential tax and heritage regime for life insurance policies is now also applicable to savings contracts subscribed to insurance companies, despite their commutative nature.
107

Provádění vstupu do objektu při mimořádných událostech policistou / The entry implementation into the building by police officer during the emergency situations.

CHALOUPKA, Pavel January 2017 (has links)
This diploma thesis is the creation of a document which clearly contains the legal powers of the Czech police that can be used in practice in the event of an extraordinary situation, where it is possible to assume the necessity of entering a building. The main objective of the work is to find out and evaluate the knowledge and preparedness of the police officers under the Regional Directorate of the Police of the South Bohemian Region to execute entrance into a building. The thesis is divided into a theoretical and practical part. The theoretical part deals with defining the basic concepts of the Czech Police and the Integrated Rescue Services (IRS). It also focuses on the issue of entry into a building for the protection of life, health and property, during evacuation, and also for extraordinary events requiring the application of selected types of IRS activities where a police officer is the overall commander. In the practical part, two hypotheses are designated for research. The main hypothesis assumes that police officers are adequately acquainted with the issue regarding entering a building. The secondary hypothesis assumes a statistically significant difference in the level of knowledge between senior staff and younger police officers. Data for the research was obtained through quantitative research by questionnaire. The arithmetic average was used to verify the main hypothesis. To verify the secondary hypothesis, two sample sets were determined and the data were statistically processed using a two-sample t-test. The result of the research is the non-confirmation of both hypotheses, and therefore, that police officers are not sufficiently familiar with the issue concerning the entering of a building and that the difference in knowledge between senior officers and younger police officers is not statistically significant.
108

Autoconceito, autoeficácia e parentalidade : crianças com deficiência física, com desenvolvimento típico e seus familiares

Oliveira, Alyne Kalyane Câmara de 26 February 2016 (has links)
Submitted by Luciana Sebin (lusebin@ufscar.br) on 2016-09-23T18:31:52Z No. of bitstreams: 1 TeseAKCO.pdf: 3353856 bytes, checksum: 9e7f857dfa5b996da0faf6f7e98d5bc1 (MD5) / Approved for entry into archive by Marina Freitas (marinapf@ufscar.br) on 2016-09-26T20:20:59Z (GMT) No. of bitstreams: 1 TeseAKCO.pdf: 3353856 bytes, checksum: 9e7f857dfa5b996da0faf6f7e98d5bc1 (MD5) / Approved for entry into archive by Marina Freitas (marinapf@ufscar.br) on 2016-09-26T20:21:09Z (GMT) No. of bitstreams: 1 TeseAKCO.pdf: 3353856 bytes, checksum: 9e7f857dfa5b996da0faf6f7e98d5bc1 (MD5) / Made available in DSpace on 2016-09-26T20:21:15Z (GMT). No. of bitstreams: 1 TeseAKCO.pdf: 3353856 bytes, checksum: 9e7f857dfa5b996da0faf6f7e98d5bc1 (MD5) Previous issue date: 2016-02-26 / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) / For the group of children with physical disabilities, beyond the motor impairments their own health condition and contextual factors, at how the child self-assesses, as the own self-concept and own self-efficacy, may lead to repercussions in learning, behavior and the child feature. Among the contextual factors, points out the influence of family caregivers in the development of self-concept and self-efficacy of their children, from how guide their children's behavior in daily life, also called as practices and parenting styles. Considering the importance of selfconcept and self-efficacy in the child development process in general and, specifically, the physically disabled children, to use their skills in daily activities and as a motivational element for the acquisition of new functional skills, it is understood as relevant to identify how these children consider themselves at different domains and the possible relationship between parenting styles and children's self-assessments. This study aimed to compare the parenting styles of family caregivers, the self-concept and self-efficacy of children with physical disabilities (PD) and children with typical development (TD), and evaluate relations among these self-assessments and parenting styles of their caregivers relatives. In this study 112 participants were grouped as follows: 20 children with PD, boys and girls, aged 8 and 12, from all motor impairment levels (mild, moderate and severe), inserted into regular school setting; 36 children with CP and 56 main family caregivers of children targeted in the study Data collection was carried out in public schools located in Natal, in the state of Rio Grande do Norte, Brazil. The instruments used with the children in both groups were the Self-Perception Profile for Children (SPPC) and Perceived Efficacy and Goal Setting System (PEGS), and among the caregivers of both groups one Characterization Data Sheet for the Caregiver and Family Group, one Characterization Data Sheet of Child and the Parenting Styles Inventory (IEP), and also the Gross Motor Function Classification System (GMFCS) - Family Report Questionnaire, used to classify the motor level only in children with PD along with their caregivers. The data were analyzed from the normative tables of each instrument of descriptive and inferential way, and for the comparative analyzes were used the t-test, chi-square, Fisher's exact test, ANOVA-one way and hoc-LSD post, and the correlation analysis, the Pearson Test. Among the results, there was a significant difference in the comparison of self-efficacy and self-concept in the dimension of 'physical appearance', in which the TD group showed higher average of these selfassessments than the PD group. It was also identified significant correlations between parenting practices and child's self- concept, both in the group of children with CP, as in children with mild PD subgroup, as well as between parenting practices and self-efficacy of children only in the TD group. It is considered that this study contributes adding to the knowledge produced in the area of education and health, allowing an analysis of risk and protective factors to human development, focusing simultaneously on families and their children with physical disabilities. The study brings contributions to direct professional performances that largely consider the development contexts, attention to family caregivers involved and active involvement of children with disabilities in investigations about their children's development process, through self-assessment. / Em crianças com deficiência física, além dos comprometimentos motores da própria condição de saúde e dos fatores contextuais, a forma como a criança se autoavalia, como seu autoconceito e sua autoeficácia, podem levar a repercussões na aprendizagem, no comportamento e na funcionalidade infantil. Dentre os fatores contextuais, aponta-se a influência dos cuidadores familiares no desenvolvimento do autoconceito e da autoeficácia de suas crianças, a partir da forma como orientam o comportamento dos filhos no cotidiano, também denominadas como práticas e estilos parentais. Considerando a importância do autoconceito e da autoeficácia no processo de desenvolvimento da criança em geral e, especificamente, da criança com deficiência física, ao utilizarem suas habilidades nas atividades diárias e como elemento motivacional para a aquisição de novas habilidades funcionais, compreende-se como relevante identificar o modo como estas crianças se percebem em diferentes domínios e as possíveis relações existentes entre os estilos parentais e as autoavaliações infantis. O presente estudo teve como objetivo comparar os estilos parentais de cuidadores familiares, o autoconceito e a autoeficácia de crianças com deficiência física (DF) e crianças com desenvolvimento típico (DT), e verificar relações entre estas autoavaliações e os estilos parentais de seus cuidadores familiares. Nesta investigação 112 participantes foram agrupados da seguinte forma: 20 crianças com DF, meninos e meninas, com idade entre 8 e 12 anos, de todos os níveis de comprometimento motor (leve, moderado e grave), inseridas em contexto escolar regular; 36 crianças com DT e 56 cuidadores familiares principais das crianças focalizadas no estudo. A coleta de dados foi realizada em escolas públicas localizadas no munícipio de Natal, no estado do Rio Grande do Norte, Brasil. Os instrumentos utilizados com as crianças de ambos os grupos foram o Self-Perception Profile for Chidren (SPPC) e o Perceived Efficacy and Goal Setting System (PEGS), c m os cuidadores dos dois grupos foi utilizada uma Ficha de Caracterização do Cuidador e Grupo Familiar, uma Ficha de Caracterização da Criança e o Inventário de Estilos Parentais (IEP) e, ainda o Gross Motor Function Classification System (GMFCS) - Family Report Questionnaire, utilizado para classificar o nível motor apenas das crianças com DF por seus cuidadores. Os dados foram analisados a partir das tabelas normativas de cada instrumento e de análise descritiva e inferencial, sendo que para as análises comparativas foram usados os Testes t, qui-quadrado, exato de Fisher, ANOVA-one way e post hoc-LSD, e para as análises de correlação, o Teste de Pearson. Dentre os resultados, verificou-se que houve diferença significativa na comparação da autoeficácia e do autoconceito na dimensão de ‘aparência física’, na qual o grupo DT apresentou maior média nestas autoavaliações do que o grupo DF. As médias das práticas parentais ‘monitoria negativa’ e ‘abuso físico’ também foram maiores significativamente no grupo DT do que no grupo DF, embora não tenham sido reveladas diferenças significativas na comparação entre as médias do estilo parental dos cuidadores. Foram encontradas correlações significativas entre a autoeficácia e dimensões do autoconceito das crianças de ambos os grupos investigados, e entre o estilo parental e a autoeficácia das crianças no grupo DT. Também foram identificadas correlações significativas entre as práticas educativas parentais e o autoconceito infantil, tanto no grupo de crianças com DT, como no subgrupo de crianças com DF leve, assim como entre as práticas educativas parentais e a autoeficácia das crianças somente no grupo DT. Considera-se que o presente estudo acrescenta ao conhecimento produzido na área da educação e saúde, permitindo uma análise dos fatores de risco e proteção ao desenvolvimento humano, com enfoque simultâneo sobre as famílias e suas crianças com deficiência física. O estudo traz contribuições para direcionar atuações profissionais que considerem implamente os contextos de desenvolvimento, a atenção aos familiares cuidadores e o envolvimento ativo de crianças com deficiência nas investigações sobre seu processo de desenvolvimento infantil, por meio de autoavaliação.
109

Análise experimental e numérica de ligações viga mista-pilar com cantoneiras de alma e assento - pavimento tipo e ligações isoladas / Theoretical and experimental analysis of beam-to-column composite connections with bottom and web angle - typical floor and isolated prototypes

William Oliveira Bessa 08 December 2009 (has links)
Esta pesquisa apresenta um amplo programa experimental de ligações viga mista-pilar com cantoneiras de alma e assento, incluindo protótipos isolados e ligações inseridas num pavimento tipo constituído de laje pré-moldada com vigotas e lajotas cerâmicas. Os objetivos do trabalho foram avaliar os efeitos da fissuração da laje no comportamento da ligação (rigidez inicial e momento resistente), o acréscimo da taxa de armadura secundária e os detalhes propostos para a ancoragem das armaduras longitudinais. Nos ensaios experimentais foram analisadas as rotações das ligações, deslocamentos e deformações nos elementos. Para o estudo teórico, tomou-se como referência o Método das Componentes do EUROCODE 3 e 4. Paralelamente, um estudo numérico para ligações mistas foi desenvolvido com o objetivo de incluir a laje de concreto, as armaduras longitudinais e transversais, além da não linearidade física e geométrica na análise por elementos finitos. De acordo com os resultados, a condição prévia de fissuração da laje mostrou-se menos relevante que a continuidade das vigas na direção do eixo de menor inércia do pilar, no que se refere à determinação da rigidez inicial e resistência das ligações mista inseridas num pavimento tipo. A metodologia de modelagem numérica foi capaz de representar de forma satisfatória os mecanismos plásticos e os estados limites últimos da ligação. / This research presents an extensive experimental study of the structural behavior of the beam-to-column composite connections with bottom and web angle, including isolated prototypes and typical floor with slab made of precast joist with lattice and bricks. The objectives were to evaluate concrete slab cracking effects in the composite connections behavior (initial stiffness and resistant moment), the secondary steel ratio increase and the proposed details for the longitudinal steel bars anchorage. In the experimental tests, it was analyzed the connection total rotation, the displacements and deformations in the connection components. The theoretical study was developed based on EURODODE 3 and 4 methodologies. Besides, a numerical study was developed with the purpose of including the concrete slab modelling, the longitudinal and transversal steel bars, and the geometrical and material non-linearity in the finite element analysis. According to the results, the beam continuity through to the column minor axis showed to be more important than the concrete slab previous cracking, for the initial stiffness and resistant moment composite connections behavior in the typical floor. The numerical models represented satisfactorily the plastic mechanism connection and the ultimate limit states.
110

Ciclos limite e singularidades típicas de sistemas de equações diferenciais suaves por partes / Limit cycles and typical singularities of piecewise smooth system of differential equations

Cespedes, Oscar Alexander Ramírez 07 March 2017 (has links)
Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2017-03-22T12:19:52Z No. of bitstreams: 2 Tese - Oscar Alexander Ramírez Cespedes - 2017.pdf: 14139665 bytes, checksum: 57b8ba9047422f62ed013be3b7bf660e (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2017-03-22T12:20:24Z (GMT) No. of bitstreams: 2 Tese - Oscar Alexander Ramírez Cespedes - 2017.pdf: 14139665 bytes, checksum: 57b8ba9047422f62ed013be3b7bf660e (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2017-03-22T12:20:24Z (GMT). No. of bitstreams: 2 Tese - Oscar Alexander Ramírez Cespedes - 2017.pdf: 14139665 bytes, checksum: 57b8ba9047422f62ed013be3b7bf660e (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2017-03-07 / Fundação de Amparo à Pesquisa do Estado de Goiás - FAPEG / In this work, we analize the version of Hilbert’s 16th problem for a piecewise linear differential system, PWLS, in R2. More precisely,we determinete the maximum number of certain types of limit cycles when the system is define in two zones separated by a straight line. Some results on the maximum number of cycles of a PWLS defined in two sectors were established. In addition, we classify typical singularities of a piecewise smooth systemin R3, taking into account the behavior of the associated sliding field. / Neste trabalho, estudamos uma versão do 16◦ Problema de Hilbert para sistemas de equações diferenciais lineares por partes, PWLS, em R2. Mais precisamente, determinamos o número máximo de certos tipos de ciclos limite quando o sistema está definido em duas zonas separadas por uma linha reta. Alguns resultados sobreo número de máximo de ciclos de um PWLS definido em dois setores são estabelecidos. Além disso, estudamos e classificamos singularidades típicas de um sistema suave por partes em R3 levando em consideração o comportamento do campo deslizante associado.

Page generated in 0.0449 seconds