Submitted by ANA KARLA PEREIRA RODRIGUES (anakarla_@hotmail.com) on 2017-08-16T13:04:43Z No. of bitstreams: 1 arquivototal.pdf: 1098275 bytes, checksum: 59e9bc1ca11ff8f14d5629548ccaaaf8 (MD5) / Made available in DSpace on 2017-08-16T13:04:43Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 1098275 bytes, checksum: 59e9bc1ca11ff8f14d5629548ccaaaf8 (MD5) Previous issue date: 2016-03-04 / Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq / In this work we study a general version of the Pietsch Domination Theorem, due to Pellegrino, Santos and Seoane-Sep´ulveda, that improves the unified version present in [3] and recovers known Pietsch Domination-type theorems where the unified approach seems not to work. / Neste trabalho estudamos uma vers˜ao geral do Teorema da Domina¸c˜ao de Pietsch, devido a Pellegrino, Santos e Seoane-Sep´ulveda, que melhora a vers˜ao unificada presente em [3] e recupera conhecidos teoremas de domina¸c˜ao do tipo Pietsch onde a abordagem unificada parece n˜ao funcionar.

Made available in DSpace on 2015-05-15T11:46:01Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 1973222 bytes, checksum: 2211069e3e843d6b7636b5e87d4ea973 (MD5) Previous issue date: 2011-07-15 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / The Bohnenblust-Hille Theorem, proved in 1931 in the prestigious journal Annals of Mathematics, asserts that if U : lN 1 ----- lN 1 --! K is an n-linear form and N is a positive integer N, then 0@ N X i1;:::;in=1 jU(ei1 ; :::; ein)j 2n n+11A n+1 2n - Cn kUk , with Cn = n n+1 2n 2 n--1 2 . After a long time overlooked, this result has been explored in the recent years. In this work we detail a beautiful proof of the Bohnenblust-Hille Theorem, due to A. Defant, U. Schwarting and D. Popa. We also investigate the estimates of the constants involved and some asymptotic information, following a recent work of D. Pellegrino and J. Seoane-Sepúlveda. / O Teorema de Bohnenblust-Hille, demonstrado em 1931 no prestigioso jornal Annals of Mathematics, garante que para toda forma n-linear U : lN 1 - - - - lN 1--! K e para qualquer inteiro positivo N, tem-se - - - - - - - - - - - - - - - - 2 . Após um longo tempo esquecido, esse resultado tem sido bastante explorado nos últimos anos. Neste trabalho fazemos, com detalhes, uma bela demonstração do Teorema de Bohnenblust-Hille, devida a A. Defant, U. Schwarting e D. Popa. Também destacamos o cálculo de estimativas das constantes envolvidas e algumas informações assintóticas, de acordo com um recente trabalho de D. Pellegrino e J. Seoane-Sepúlveda.

Made available in DSpace on 2015-05-15T11:46:05Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 865721 bytes, checksum: 3cb3fb14f515822a2db03f7945b5427a (MD5) Previous issue date: 2013-04-05 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / This work presents a study of Cohen strongly summing operators under the viewpoint of the theory of multilinear operators ideals and polynomial ideals. Furthermore, we introduce two new classes that generalize the concept of multilinear operators and polynomials of this nature, namely multiple Cohen strongly summing operators and Cohen strongly summing operators at a given point. We show that the new classes defined, as well as the previous classes, form normed ideals of operators/polynomials and that the class of multiple Cohen strongly summing operators forms a Banach ideal. We also show that the construction of the class of multiple Cohen strongly summing operators provides a holomorphy type and a coherent and compatible sequence of ideals. / Neste trabalho apresentamos um estudo dos operadores Cohen fortemente somantes sob o ponto de vista da teoria de ideais de operadores e polinômios. Além disso, introduzimos duas novas classes de operadores que generalizam o conceito de operadores multilineares e polinômios desta natureza, a saber, os operadores múltiplo Cohen fortemente somantes e os operadores Cohen fortemente somantes num dado ponto. Mostramos que as novas classes definidas, como as anteriores, formam ideais normados de operadores/polinômios e que os operadores múltiplo Cohen fortemente somantes formam um ideal de Banach. Também mostramos que a construção da classe dos operadores múltiplo Cohen fortemente somantes fornece um tipo de holomorfia e uma sequência coerente e compatível de ideais.

Made available in DSpace on 2015-05-15T11:46:23Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 307839 bytes, checksum: 553ac98ac1aedf90b6360c3dc22177eb (MD5) Previous issue date: 2010-02-19 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / In this work we investigate, in detail, recent research works related to the theory of absolutely summing operators between Banach spaces. More precisely, we investigate the connection between the concept of cotype and coincidence results in the theory of absolutely summing operators. / Neste trabalho estudamos, com detalhes, temas de pesquisa relacionados à teoria dos operadores lineares absolutamente somantes entre espaços de Banach. Mais precisamente, investigamos a relação entre o conceito de cotipo e resultados de coincidência na teoria de operadores absolutamente somantes.

This thesis describes the development of electronic modules for fusion neutron spectroscopy as well as several implementations of artificial neural networks (NN) for neutron diagnostics for the Joint European Torus (JET) experimental reactor in England. The electronics projects include the development of two fast light pulser modules based on Light Emitting Diodes (LEDs) for the calibration and stability monitoring of two neutron spectrometers (MPRu and TOFOR) at JET. The particular electronic implementation of the pulsers allowed for operation of the LEDs in the nanosecond time scale, which is typically not well accessible with simpler circuits. Another electronic project consisted of the the development and implementation at JET of 32 high frequency analog signal amplifiers for MPRu. The circuit board layout adopted and the choice of components permitted to achieve bandwidth above 0.5 GHz and low distortion for a wide range of input signals. The successful and continued use of all electronic modules since 2005 until the present day is an indication of their good performance and reliability. The NN applications include pulse shape discrimination (PSD), deconvolution of experimental data and tomographic reconstruction of neutron emissivity profiles for JET. The first study showed that NN can perform neutron/gamma PSD in liquid scintillators significantly better than other conventional techniques, especially for low deposited energy in the detector. The second study demonstrated that NN can be used for statistically efficient deconvolution of neutron energy spectra, with and without parametric neutron spectroscopic models, especially in the region of low counts in the data. The work on tomography provided a simple but effective parametric model for describing neutron emissivity at JET. This was then successfully implemented with NN for fast and automatic tomographic reconstruction of the JET camera data. The fast execution time of NN, i.e. usually in the microsecond time scale, makes the NN applications presented here suitable for real-time data analysis and typically orders of magnitudes faster than other commonly used codes. The results and numerical methods described in this thesis can be applied to other diagnostic instruments and are of relevance for future fusion reactors such as ITER, currently under construction in Cadarache, France.

Submitted by Leonardo Cavalcante (leo.ocavalcante@gmail.com) on 2018-05-03T12:04:50Z No. of bitstreams: 1 Arquivototal.pdf: 1304658 bytes, checksum: e4e550beeae66c0949fd33c9fa86db45 (MD5) / Made available in DSpace on 2018-05-03T12:04:50Z (GMT). No. of bitstreams: 1 Arquivototal.pdf: 1304658 bytes, checksum: e4e550beeae66c0949fd33c9fa86db45 (MD5) Previous issue date: 2017-06-09 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / Abstract indisponível neste campo - O PDF foi entregue protegido para cópia / Resumo indisponível neste campo - O PDF foi entregue protegido para cópia

Submitted by ANA KARLA PEREIRA RODRIGUES (anakarla_@hotmail.com) on 2017-08-10T12:12:27Z No. of bitstreams: 1 arquivototal.pdf: 955147 bytes, checksum: f6b8d3b1e6ba8fba22d9e0a28e6685fc (MD5) / Made available in DSpace on 2017-08-10T12:12:27Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 955147 bytes, checksum: f6b8d3b1e6ba8fba22d9e0a28e6685fc (MD5) Previous issue date: 2016-08-10 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / In this work, we present a version little know of the famous Hölder's Inequality, considering the context of Lp and lp spaces for mixed norms. We show how a suitable use this inequality has influencied positively others classical inequalities, to highlight, the multilinear inequalities of Bohnenblust-Hille and Hardy-Littlewood. / No presente trabalho, apresentamos uma versão pouco conhecida da famosa Desigualdade de Hölder, considerando o contexto dos espaços Lp e lp com normas mistas. Mostramos como o uso adequado desta desigualdade vem influenciando positivamente outras desigualdades clássicas, a destacar, as desigualdades multilineares de Bohnenblust-Hille e Hardy-Littlewood.

Submitted by ANA KARLA PEREIRA RODRIGUES (anakarla_@hotmail.com) on 2017-08-17T16:04:13Z No. of bitstreams: 1 arquivototal.pdf: 699730 bytes, checksum: d48ddf5357572db4dac922761f91c532 (MD5) / Made available in DSpace on 2017-08-17T16:04:13Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 699730 bytes, checksum: d48ddf5357572db4dac922761f91c532 (MD5) Previous issue date: 2016-04-04 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / In this study we show two classical inequalities, namely Bohnenblust-Hille inequality and Hardy-Littlewood inequality. The rst one, conceived as a tool for the study of problems related to Dirichlet series, is a generalization of Littlewood`s 4/3 inequality to multilinear forms. The second is a generalization of Bohnenblust-Hille inequality, produced by the replacement of c0 with lp. / No presente trabalho abordaremos duas desigualdades cl assicas, a saber, a Desigualdade de Bohnenblust-Hille e a Desigualdade de Hardy- Littlewood. A primeira, surgiu como ferramenta para o estudo de problemas relacionados a s eries de Dirichlet e e uma generaliza c~ao para formas multilineares da Desigualdade 4/3 de Littlewood. A segunda consiste de uma generaliza c~ao da Desigualdade de Bohnenblust-Hille, produzida pela substituição de c0 por lp.

Made available in DSpace on 2015-05-15T11:46:23Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 418757 bytes, checksum: 97ca82a023bab37c97750bb5718cddb3 (MD5) Previous issue date: 2010-02-12 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / In this work we study a recent unified version of Pietsch Domination Theorem, due to Botelho, Pellegrino and Rueda ([8]) that unifies a number of known Pietsch-type domination theorems for classes of mappings that generalize the ideal of absolutely p- summing linear operators. A final result shows that Pietsch-type domination theorems are totally free from algebraic conditions, such as linearity, multilinearity, etc. / Neste trabalho, dissertamos sobre uma recente versão unificada do Teorema da Dominação de Pietsch, devida a Botelho, Pellegrino e Rueda ([8]), que unifica vários teoremas de dominação do tipo Pietsch para certas classes de funções que generalizam o ideal dos operadores lineares absolutamente p-somantes. Um resultado final mostra que tais teoremas de dominação são totalmente livres de condições algébricas, tais como linearidade, multilinearidade, etc.

Fluid simulating is one of the most difficult problems in computer graphics. On the other hand, water appears in our life very frequently. This thesis focuses on water simulating. We have two main methods to do this in the thesis: the first is wave based water simulating; Sine wave summing based and Fast Fourier Transform based methods are all belong to this part. The other one is physics based water simulating. We make it based on Navier-Stokes Equation and it is the most realistic animation of water. It can deal with the boundary and spray which other method cannot express. Then we put our emphasis on implement by the physics method using Navier-Stokes Equation.