After the Opium War, China has entered a rapid transformation. At the later period of Qing Dynasty, fictions were put to excellent, it was emphasized the actual function of the social. It reflected social conditions and enlighten the people through advocacy fictions. Intellectuals deeply appreciate female issues tightly linked with the fate of the country, and carried out the large-scale feminist movement of the later period of Qing Dynasty. Through against foot-binding, build female schools , promote freedom of marriage, established the independent personality of female, and the liberated women totally. Fictions were written female lives and reflected women' issues at this time. "Huang Hsiu Chiu" reflected female lives and situations very well in many feminist fictions, it was centered foot-binding, female education, women' issues. Miao-Ru Wang had created a a group of new revolutionary female who be strong, be no fear of might by female writing in "Female Prison Flower". These females found themselves in the corresponding relationships of saving the nation, women's rights, and woman's education.

自來文人每以漢賦與唐詩、宋詞、元曲分庭抗禮，各據一代之勝。 孫松友四六叢話言兩漢之賦「雖不盡傳，而沈博絕麗之作，至今膾炙，非後世所可及 」。王觀堂亦指此為一代文學，後世莫能繼焉。焦里堂則直指「魏晉以後之賦，為漢 賦之餘氣遊魂也。」是以為謀賦體之正本清源，遂決作漢賦之研究。 然漢賦多矣。若一一推求，勢所難能。今僅就其代表作家加以探索，考兩漢最具代表 性之賦家，厥惟揚馬，後世雖有益以班張，合稱四傑者。然孟堅為史家之良材，平子 為科學之巨擘，其於賦也，並沐揚馬之遺澤，未能更樹一宗，故乃先取此二家，以資 辨析焉。 本文分七章，長卿子雲分論。以評傳居首，賦篇之分析次之，然後殿之以賦篇韻譜分 析。二家之評傳，皆分時代背景，生平評述、著述評介三節，乃先就文學流變、政治 情勢、社會經濟、學術思想各端而探究之，以為評斷其人品及作品之依據。然後考其 先世身家、平生略歷、予以先後，繫以年代，再就其學殖人品、思想主張、與文學地 位等各方面，加以考評。至於著述評介，則將分門別類，述介其內容，勾勒其體貌， 衡量其價值，以概見其成就。 若夫馬揚賦篇之分析，則各立專章，並依篇為節，論其結構，析其內容，究其技巧， 述其影響。此外並依各賦之性質，或定其題稱、辨其真偽；或考其動機、釐其主旨； 或探其體類，繹其思維，皆欲務求深入而詳盡。 賦篇韻譜之排列與辨析，旨在深究馬揚賦篇之體製形貌，明西漢之音韻，以及蜀郡方 音之影響，進而作為探究作品真偽之依據。 末章則在綜述馬揚二家辭賦之特色，並作比較研究。就其組織、修辭、內質、外象分 別考述，大體依友人黃春貴所撰文心雕龍創作論、分謀篇、章法、句式、字詞、比興 、夸飾、用典、隱秀、思想、情感、想像、氣力、辭采、聲律、對偶、風格等子目、 一一品較。 /

Electron transfer, ET, and proton-coupled electron transfer, PCET, reactions are central to biological reactions involving catalysis, energy conversion and energy storage. The movement of electrons and protons in either a sequential or concerted manner are coupled in a series of elementary reaction steps in respiration and photosynthesis to harvest and convert energy consumed in foodstuffs or by absorption of light into high energy chemi-cal bonds in the form of ATP. These electron transfer processes may be modulated by conformational dynamics within the protein matrix or at the protein-protein interface, the energetics of which are still not well understood. Photoacoustic calorimetry is an estab-lished method of obtaining time-resolved reaction enthalpy and volume changes on the nanosecond to microsecond timescale. Photoacoustic calorimetry is used here to probe 1) the energetics and volume changes for ET between the self-assembled anionic uroporphy-rin:cytochrome c complex and the role of the observed volume changes in modulating ET within the complex, 2) the enthalpy and volume change for the excited state PCET reac-tion of a tyramine functionalized ruthenium(II) bis-(2,2'-bipyridine)(4-carboxy-4'-methyl-2,2'-bipyrine) meant to be a model for the tyrosine PCET chemistry carried out by cyto-chrome c oxidase and photosystem II, 3) the enthalpy and volume changes related to car-bon monoxide and tryptophan migration in heme tryptophan catabolic enzyme indoleam-ine 2,3-dioxygenase.

This paper is an exploration of the theme of pilgrimage in the following three works: Gan&dotbelow;d&dotbelow;vyuha, Journey to the West and The Life of Marpa the Translator. / Through an examination of the narrative structure of the texts, I derive a pattern which is consistent throughout these three Mahayana works. This pattern is then compared to the Mahayana doctrine of Two Truths, which is shown to be expressed by the literary pilgrimage. Finally, by exploring the ways in which these texts 'work' on the reader---both by seeing the protagonist go through the stages of Buddhist practice and through the reader's interaction with the text---I show how reading these stories can act as a transformative Buddhist practice.

No description available.

Made available in DSpace on 2014-12-17T14:08:40Z (GMT). No. of bitstreams: 1 FelipeZA_DISSERT.PDF: 5156580 bytes, checksum: cf88acbbf99c9d93a555a758d3e21bf5 (MD5) Previous issue date: 2010-10-23 / The seismic processing technique has the main objective to provide adequate picture of geological structures from subsurface of sedimentary basins. Among the key steps of this process is the enhancement of seismic reflections by filtering unwanted signals, called seismic noise, the improvement of signals of interest and the application of imaging procedures. The seismic noise may appear random or coherent. This dissertation will present a technique to attenuate coherent noise, such as ground roll and multiple reflections, based on Empirical Mode Decomposition method. This method will be applied to decompose the seismic trace into Intrinsic Mode Functions. These functions have the properties of being symmetric, with local mean equals zero and the same number of zero-crossing and extremes. The developed technique was tested on synthetic and real data, and the results were considered encouraging / O processamento s?smico tem como principal objetivo fornecer imagem adequada das estruturas geol?gicas da sub-superf?cie de bacias sedimentares. Dentre as etapas fundamentais deste processamento est? o enriquecimento das reflex?es s?smicas atrav?s de filtragem de sinais indesej?veis, chamados de ru?dos, a amplifica??o de sinais de interesse e a aplica??o de processos de imageamento. Os ru?dos s?smicos podem aparecer de forma aleat?ria ou coerente. Nesta disserta??o ser? apresentado uma t?cnica para atenuar ru?dos coerentes, como o ground roll e as reflex?es m?ltiplas, baseado na Decomposi??o em Modos Emp?ricos. Este m?todo consiste em decompor o tra?o s?smico em Fun??es de Modo Intr?nseco, que s?o fun??es sim?tricas com m?dia local igual a zero e mesmo n?mero de zeros e extremos. A t?cnica desenvolvida foi testado em dados sint?ticos e reais, e os resultados obtidos foram considerados encorajadores

Submitted by Marco Antônio de Ramos Chagas (mchagas@ufv.br) on 2017-03-28T17:54:26Z No. of bitstreams: 1 texto completo.pdf: 1236333 bytes, checksum: 4dc870eef1cd9f0ed614f5fcc0c9a7d5 (MD5) / Made available in DSpace on 2017-03-28T17:54:26Z (GMT). No. of bitstreams: 1 texto completo.pdf: 1236333 bytes, checksum: 4dc870eef1cd9f0ed614f5fcc0c9a7d5 (MD5) Previous issue date: 2003-08-29 / Conselho Nacional de Desenvolvimento Científico e Tecnológico / A construção e a consolidação de organizações democráticas é um tema caro e objeto de preocupação, seja na prática ou nos diversos estudos dos Movimentos Sociais e organizações de base. Este tema tem gerado consideráveis debates tanto em meio às entidades e ONGs (Organizações Não Governamentais) voltadas para a promoção do Desenvolvimento Sustentável, quanto no âmbito das agências de cooperação e no meio acadêmico.O objetivo central deste estudo foi o de compreender o processo de formação, evolução, consolidação e transformação por que passam determinadas organizações de trabalhadores/as rurais à partir da história da Associação Regional de Mulheres Trabalhadoras Rurais do Bico do Papagaio, ASMUBIP, com a qual mantivemos contato no âmbito da prática extensionista como agente de pastoral e assessora educacional da Comissão Pastoral da Terra (CPT). Este estudo concentrou-se, mais detidamente, em compreender os porquês da ASMUBIP ter chegado a uma situação de fragilidade organizacional mesmo após vários anos de esforços e investimentos de entidades de apoio e agências de cooperação para o desenvolvimento. Na escolha do referencial teórico optou-se pelo diálogo com um conjunto de autores que têm desenvolvido estudos, inclusive comparativos, com diversas organizações camponesas atuando na Ásia, África e América Latina. No universo estudado verificamos, dentre outros, dois aspectos- chave, imprescindíveis para a consolidação desta organização: a) a autonomia do grupo, que diz respeito à sua capacidade de fixar objetivos e à possibilidade de tomar as próprias decisões livre de ingerências externas, seja de governos, grupos religiosos ou instituições de desenvolvimento, e b) à promoção da participação ao nível da base, promovendo, assim, um processo de tomada de decisões coletivamente. É importante considerar que a organização em estudo trata-se de uma associação de mulheres motivada, na sua origem, pelas questões centradas em “questões de mulheres” como saúde, sexualidade, direitos, violência doméstica, dupla jornada de trabalho, etc. Na ASMUBIP esta demanda inicial transmutou-se no decorrer do processo que engendrou a sua institucionalização, através, no ano de 1992, do incentivo do governo federal, passando a enfocar a organização e articulação das mulheres à partir da busca de alternativas econômicas e de geração de renda para as famílias especialmente por meio do extrativismo do Babaçu. A organização, então, passou a direcionar a sua agenda principal na busca de projetos e projetinhos de geração de renda em detrimento dos temas mais voltados, especificamente, para o ser mulher. Este direcionamento, no que se refere à ideologia que perpassa a organização, trouxe, dentre outros impactos, a dependência de recursos e assessores externos tanto para gestão quanto para a elaboração e execução dos projetos, comprometendo, assim, a autonomia do grupo e a participação da base nas decisões e condução do processo, aspectos de importância vital para construção e consolidação de organizações que se pretendem democráticas. / The construction and consolidation of the democratic organizations is a precious theme as well as worrisome matter either in practice and the several studies of the Social Movements and base organizations. This theme has been generating considerable debates in the entities and ONGs (No- Government Organizations) that are directed toward the promotion of the Maintainable Development, as well as at the extent of the cooperation agencies and in the academic sphere. O main objective of this study was to understand the formative, evolutionary, consolidate and transformative process to which certain organizations of rural workers have been subjected through the history of the Regional Association of Rural Working Women in “Bico do Papagaio” (ASMUBIP) to which we contacted at the extent of the extension practice as a pastoral agent and educational assistant “Comissão Pastoral da Terra” (CPT). This study was most carefully concentrated on understanding the reasons why ASMUBIP has arrived to such an organizational fragility situation in spite of several years with efforts and investments have been spent by the support entities and cooperation agencies for the development. Concerning to the theoretical referential, the option was made for the dialogue with a group of authors who have been developing studies, including the comparative ones, with several rural organizations operating in Asia, Africa and Latin America. In the studied universe, two key-aspects among others indispensable for the consolidation of this organization were found: a) the group’s autonomy, that is concerned to their capacity to establish the objectives, as well as to the possibility to make their own decisions without external interventions of governments, religious groups or development institutions; and b) to the promotion of participation at the level of the base, therefore promoting a process making decisions collectively. It is important to consider that the organization under study is concerned to a women association originally motivated by the matters centered on “women's subjects” such as health, sexuality, rights, domestic violence, double working day, etc. In ASMUBIP this initial demand was transmuted as the process was going on, which engendered its institutionalization in 1992 through the federal government's incentive by beginning to focus the organization and articulation of the women from the search for economical alternatives and income generation that would contemplate the families especially through the extractivism of Babassu. Then, the organization began to address its main agenda toward the search for projects and small projects of income generation to the detriment of the themes more specifically directed to the woman being. Concerning to the ideology that pass over the organization, this directioning brought, among other impacts, the dependence on resources and external assistants for administration as for the elaboration and execution of the projects, so endangering the group’s autonomy and the participation of the base in the decisions and conduction of the process, which are aspects of vital importance for the construction and consolidation of the organizations that are intended to be democratic ones. / Dissertação importada do Alexandria

Made available in DSpace on 2015-03-03T15:16:22Z (GMT). No. of bitstreams: 1 EdemersonSBM.pdf: 812078 bytes, checksum: 167690407a20b9462083f00be2b0a159 (MD5) Previous issue date: 2007-12-28 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / In this work, the study of some complex systems is done with use of two distinct procedures. In the first part, we have studied the usage of Wavelet transform on analysis and characterization of (multi)fractal time series. We have test the reliability of Wavelet Transform Modulus Maxima method (WTMM) in respect to the multifractal formalism, trough the calculation of the singularity spectrum of time series whose fractality is well known a priori. Next, we have use the Wavelet Transform Modulus Maxima method to study the fractality of lungs crackles sounds, a biological time series. Since the crackles sounds are due to the opening of a pulmonary airway bronchi, bronchioles and alveoli which was initially closed, we can get information on the phenomenon of the airway opening cascade of the whole lung. Once this phenomenon is associated with the pulmonar tree architecture, which displays fractal geometry, the analysis and fractal characterization of this noise may provide us with important parameters for comparison between healthy lungs and those affected by disorders that affect the geometry of the tree lung, such as the obstructive and parenchymal degenerative diseases, which occurs, for example, in pulmonary emphysema. In the second part, we study a site percolation model for square lattices, where the percolating cluster grows governed by a control rule, corresponding to a method of automatic search. In this model of percolation, which have characteristics of self-organized criticality, the method does not use the automated search on Leaths algorithm. It uses the following control rule: pt+1 = pt + k(Rc ? Rt), where p is the probability of percolation, k is a kinetic parameter where 0 < k < 1 and R is the fraction of percolating finite square lattices with side L, LxL. This rule provides a time series corresponding to the dynamical evolution of the system, in particular the likelihood of percolation p. We proceed an analysis of scaling of the signal obtained in this way. The model used here enables the study of the automatic search method used for site percolation in square lattices, evaluating the dynamics of their parameters when the system goes to the critical point. It shows that the scaling of , the time elapsed until the system reaches the critical point, and tcor, the time required for the system loses its correlations, are both inversely proportional to k, the kinetic parameter of the control rule. We verify yet that the system has two different time scales after: one in which the system shows noise of type 1 f , indicating to be strongly correlated. Another in which it shows white noise, indicating that the correlation is lost. For large intervals of time the dynamics of the system shows ergodicity / Neste trabalho, o estudo de alguns sistemas complexos ? feito com a utiliza??o de dois procedimentos distintos. Na primeira parte, estudamos a utiliza??o da transformada Wavelet na an?lise e caracteriza??o (multi)fractal de s?ries temporais. Testamos a confiabilidade do M?todo do M?ximo do M?dulo da Transformada Wavelet (MMTW) com rela??o ao formalismo multifractal, por meio da obten??o do espectro de singularidade de s?ries temporais cuja fractalidade ? bem conhecida a priori. A seguir, usamos o m?todo do m?ximo do m?dulo da transformada wavelet para estudar a fractalidade dos ru?dos de crepita??o pulmonar, uma s?rie temporal biol?gica. Uma vez que a crepita??o pulmonar se d? no momento da abertura de uma via a?rea ? br?nquios, bronqu?olos e alv?olos ? que estava inicialmente fechada, podemos obter informa??es sobre o fen?meno de abertura em cascata das vias a?reas de todo o pulm?o. Como este fen?meno est? associado ? arquitetura da ?rvore pulmonar, a qual apresenta geometria fractal, a an?lise e caracteriza??o da fractalidade desse ru?do pode nos fornecer importantes par?metros de compara??o entre pulm?es sadios e aqueles acometidos por patologias que alteram a geometria da ?rvore pulmonar, tais como as doen?as obstrutivas e as de degenera??o parenquimatosa, que ocorre, por exemplo, no enfisema pulmonar. Na segunda parte, estudamos um modelo de percola??o por s?tios em rede quadrada, onde o aglomerado de percola??o cresce governado por uma regra de controle, correspondendo a um m?todo de busca autom?tica. Neste modelo de percola??o, que apresenta caracter?sticas de criticalidade auto-organizada, o m?todo de busca autom?tica n?o usa o algoritmo de Leath. Usa-se a seguinte regra de controle: pt+1 = pt +k(Rc ?Rt), onde p ? a probabilidade de percola??o, k ? um par?metro cin?tico onde 0 < k < 1 e R ? a fra??o de redes quadradas finitas de lado L, LxL, percolantes. Esta regra fornece uma s?rie temporal correspondente ? evolu??o din?mica do sistema, em especial da probabilidade de percola??o p. ? feita uma an?lise de escalas do sinal assim obtido. O modelo aqui utilizado permite que o m?todo de busca autom?tica para a percola??o por s?tios em rede quadrada seja, per si, estudado, avaliando-se a din?mica dos seus par?metros quando o sistema se aproxima do ponto cr?tico. Verifica-se que os escalonamentos de ?, o tempo decorrido at? que o sistema chegue ao ponto cr?tico, e de tcor, o tempo necess?rio para que o sistema perca suas correla??es, s?o, ambos, inversamente proporcionais a k, o par?metro cin?tico da regra de controle. Verifica-se ainda que o sistema apresenta duas escalas temporais distintas depois de ? : uma em que o sistema mostra ru?do do tipo 1 f? , indicando ser fortemente correlacionado; outra em que aparece um ru?do branco, indicando que se perdeu a correla??o. Para grandes intervalos de tempo a din?mica do sistema mostra que ele se comporta como um sistema erg?dico

Made available in DSpace on 2015-03-03T15:28:33Z (GMT). No. of bitstreams: 1 RafaelaHSR_DISSERT.pdf: 2083489 bytes, checksum: 205ac27477b3c2a065fe9cb369c9200e (MD5) Previous issue date: 2013-02-28 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / In the work reported here we present theoretical and numerical results about a Risk Model with Interest Rate and Proportional Reinsurance based on the article Inequalities for the ruin probability in a controlled discrete-time risk process by Ros ario Romera and Maikol Diasparra (see [5]). Recursive and integral equations as well as upper bounds for the Ruin Probability are given considering three di erent approaches, namely, classical Lundberg inequality, Inductive approach and Martingale approach. Density estimation techniques (non-parametrics) are used to derive upper bounds for the Ruin Probability and the algorithms used in the simulation are presented / Neste trabalho apresentamos resultados te?ricos e num?ricos referentes a um Modelo de Risco com Taxa de Juros e Resseguro Proporcional baseados no artigo Inequalities for the ruin probability in a controlled discrete-time risk process de Ros?rio Romera e Maikol Diasparra (veja [5]). Equa??es recursivas e integrais para a Probabilidade de Ru?na s?o obtidas bem como cotas superiores para a mesma por diferentes abordagens, a saber, pela cl?ssica desigualdade de Lundberg, pela abordagem Indutiva e pela abordagem Martingale. T?cnicas de estima??o de densidade (n?o-param?tricas) s?o utilizadas para a obten??o das cotas para a Probabilidade de Ru?na e os algoritmos utilizados na simula??o s?o apresentados

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-03-02T23:01:37Z No. of bitstreams: 1 RafaelaCarreiroDias_DISSERT.pdf: 7493649 bytes, checksum: 18d66dcedc96371bd5f40830e9aec1ba (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-03-04T21:54:12Z (GMT) No. of bitstreams: 1 RafaelaCarreiroDias_DISSERT.pdf: 7493649 bytes, checksum: 18d66dcedc96371bd5f40830e9aec1ba (MD5) / Made available in DSpace on 2016-03-04T21:54:12Z (GMT). No. of bitstreams: 1 RafaelaCarreiroDias_DISSERT.pdf: 7493649 bytes, checksum: 18d66dcedc96371bd5f40830e9aec1ba (MD5) Previous issue date: 2014-03-06 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq / O ru?do s?smico tem sido tradicionalmente considerado como uma perturba??o n?o desejada do ambiente que ?contamina? a aquisi??o de dados de terremotos. Mas ao longo da ?ltima d?cada tem sido mostrado que informa??es coerentes sobre a estrutura do subsolo podem ser extra?das a partir de correla??es cruzadas do ru?do s?smico de ambiente. Neste contexto, as regras s?o reversas, sendo os terremotos o que necessitamos excluir dos dados. Os principais causadores do ru?do s?smico de ambiente s?o os microssismos oce?nicos e perturba??es atmosf?ricas. A per?odos menores que 30 s, o espectro do ru?do s?smico de ambiente ? dominado por energia micross?smica. O microssismo ? o sinal s?smico mais cont?nuo da Terra e pode ser classificado como prim?rio (observado na faixa 10-20 s) e secund?rio (observado na faixa 5-10 s). A fun??o de Green do meio de propaga??o entre dois receptores pode ser reconstru?da atrav?s da correla??o cruzada do ru?do s?smico de ambiente registrado simultaneamente nesses dois receptores. A reconstru??o da fun??o de Green ? geralmente proporcional ? por??o de ondas de superf?cie do campo de onda s?smico, j? que a energia micross?smica viaja principalmente como ondas de superf?cie. Neste trabalho, s?o apresentadas 194 fun??es de Green obtidas a partir de correla??es cruzadas de 1 m?s de registro da componente vertical do ru?do s?smico de ambiente para diferentes pares de esta??es s?smicas do Nordeste do Brasil. As correla??es cruzadas di?rias foram empilhadas utilizando a t?cnica n?o linear tf-PWS que real?a sinais coerentes fracos atrav?s da redu??o de ru?do incoerente. As correla??es cruzadas mostram que o sinal emergido ? dominado por ondas Rayleigh nas componentes verticais e que as velocidades de dispers?o podem ser medidas confiavelmente para uma faixa de per?odos entre 5 e 20 s. O estudo inclui tanto esta??es permanentes para monitoramento s?smico, quanto esta??es tempor?rias de experimentos passivos na regi?o, formando uma rede combinada de 33 esta??es separadas por dist?ncias entre 60 e 1311 km, aproximadamente. Estas medidas de velocidades de dispers?o de ondas Rayleigh em seguida s?o usadas na elabora??o de imagens tomogr?ficas da Prov?ncia Borborema do Nordeste do Brasil. As tomografias de ru?do s?smico obtidas aqui permitem mapear satisfatoriamente fei??es estruturais existentes na regi?o. As imagens tomogr?ficas de per?odos mais curtos (~5 s) mostram a estrutura crustal rasa e claramente definem as bacias sedimentares marginais e intracontinentais, bem como as partes de zonas de cisalhamento importantes que atravessam a Prov?ncia Borborema. As imagens tomogr?ficas de per?odos mais longos (10 - 20 s) atingem profundidades da crosta superior e a maior parte das anomalias desaparece. Algumas delas localizada no interior da Prov?ncia Borborema, no entanto, persistem. A evolu??o Cenoz?ica da Prov?ncia Borborema foi marcada por epis?dios de vulcanismo Cenoz?ico e eleva??o, mas nenhuma correla??o ? observada com estas caracter?sticas Cenoz?icas e as anomalias profundas. As anomalias n?o se correlacionam com mapas dispon?veis de fluxo de calor superficial na Prov?nica Borborema, e a origem das anomalias profundas permanece enigm?tica. / Ambient seismic noise has traditionally been considered as an unwanted perturbation in seismic data acquisition that "contaminates" the clean recording of earthquakes. Over the last decade, however, it has been demonstrated that consistent information about the subsurface structure can be extracted from cross-correlation of ambient seismic noise. In this context, the rules are reversed: the ambient seismic noise becomes the desired seismic signal, while earthquakes become the unwanted perturbation that needs to be removed. At periods lower than 30 s, the spectrum of ambient seismic noise is dominated by microseism, which originates from distant atmospheric perturbations over the oceans. The microsseism is the most continuous seismic signal and can be classified as primary ? when observed in the range 10-20 s ? and secondary ? when observed in the range 5-10 s. The Green?s function of the propagating medium between two receivers (seismic stations) can be reconstructed by cross-correlating seismic noise simultaneously recorded at the receivers. The reconstruction of the Green?s function is generally proportional to the surface-wave portion of the seismic wavefield, as microsseismic energy travels mostly as surface-waves. In this work, 194 Green?s functions obtained from stacking of one month of daily cross-correlations of ambient seismic noise recorded in the vertical component of several pairs of broadband seismic stations in Northeast Brazil are presented. The daily cross-correlations were stacked using a timefrequency, phase-weighted scheme that enhances weak coherent signals by reducing incoherent noise. The cross-correlations show that, as expected, the emerged signal is dominated by Rayleigh waves, with dispersion velocities being reliably measured for periods ranging between 5 and 20 s. Both permanent stations from a monitoring seismic network and temporary stations from past passive experiments in the region are considered, resulting in a combined network of 33 stations separated by distances between 60 and 1311 km, approximately. The Rayleigh-wave, dispersion velocity measurements are then used to develop tomographic images of group velocity variation for the Borborema Province of Northeast Brazil. The tomographic maps allow to satisfactorily map buried structural features in the region. At short periods (~5 s) the images reflect shallow crustal structure, clearly delineating intra-continental and marginal sedimentary basins, as well as portions of important shear zones traversing the Borborema Province. At longer periods (10 ? 20 s) the images are sensitive to deeper structure in the upper crust, and most of the shallower anomalies fade away. Interestingly, some of them do persist. The deep anomalies do not correlate with either the location of Cenozoic volcanism and uplift - which marked the evolution of the Borborema Province in the Cenozoic - or available maps of surface heat-flow, and the origin of the deep anomalies remains enigmatic.