Estudo e aplicação da transformada de Fourier na regularização de dados sísmicos na exploração de petróleo

In the oil prospection research seismic data are usually irregular and sparsely sampled along the spatial coordinates due to obstacles in placement of geophones. Fourier methods provide a way to make the regularization of seismic data which are efficient if the input data is sampled on a regular grid. However, when these methods are applied to a set of irregularly sampled data, the orthogonality among the Fourier components is broken and the energy of a Fourier component may "leak" to other components, a phenomenon called "spectral leakage". The objective of this research is to study the spectral representation of irregularly sampled data method. In particular, it will be presented the basic structure of representation of the NDFT (nonuniform discrete Fourier transform), study their properties and demonstrate its potential in the processing of the seismic signal. In this way we study the FFT (fast Fourier transform) and the NFFT (nonuniform fast Fourier transform) which rapidly calculate the DFT (discrete Fourier transform) and NDFT. We compare the recovery of the signal using the FFT, DFT and NFFT. We approach the interpolation of seismic trace using the ALFT (antileakage Fourier transform) to overcome the problem of spectral leakage caused by uneven sampling. Applications to synthetic and real data showed that ALFT method works well on complex geology seismic data and suffers little with irregular spatial sampling of the data and edge effects, in addition it is robust and stable with noisy data. However, it is not as efficient as the FFT and its reconstruction is not as good in the case of irregular filling with large holes in the acquisition.

Utilização da transformada de wavelet para detecção de variações anormais de tensão em sistemas elétricos com geração distribuída

The increasing demand in electricity and decrease forecast, increasingly, of fossil fuel reserves, as well as increasing environmental concern in the use of these have generated a concern about the quality of electricity generation, making it well welcome new investments in generation through alternative, clean and renewable sources. Distributed generation is one of the main solutions for the independent and selfsufficient generating systems, such as the sugarcane industry. This sector has grown considerably, contributing expressively in the production of electricity to the distribution networks. Faced with this situation, one of the main objectives of this study is to propose the implementation of an algorithm to detect islanding disturbances in the electrical system, characterized by situations of under- or overvoltage. The algorithm should also commonly quantize the time that the system was operating in these conditions, to check the possible consequences that will be caused in the electric power system. In order to achieve this it used the technique of wavelet multiresolution analysis (AMR) for detecting the generated disorders. The data obtained can be processed so as to be used for a possible predictive maintenance in the protection equipment of electrical network, since they are prone to damage on prolonged operation under abnormal conditions of frequency and voltage.

Flo Kennedy and Barbara Love at NOW conference, Atlantic City

General note: Title and date provided by Bettye Lane.

Barbara Love, co-author of "Sappho was a Right on Woman"

General note: Title and date provided by Bettye Lane.

Writer Shere Hite, author of "Hite Report" and new book "Women and Love"

General note: Title and date provided by Bettye Lane.

Writer Shere Hite, author of "Hite Report" and new book "Women and Love"

General note: Title and date provided by Bettye Lane.

Writer Shere Hite, author of "Hite Report" and new book "Women and Love"

General note: Title and date provided by Bettye Lane.

Writer Shere Hite, author of "Hite Report" and new book "Women and Love"

General note: Title and date provided by Bettye Lane.

Anti-woman's rights demonstrators, mostly male, one holding a sign reading, "This morning I made love to my wife - she loved it!"

Inscription: Verso: protestors demonstrate against women's rights, Fifth Avenue, New York.

Marchers at International Women's Day rally holding signs reading "Love doesn't pay the bills" and "All women all ages collect your wages"

Inscription: Verso: International Woman's Day rally, New York.

Nuevas capacidades estatales para una sociedad transformada : Instituciones y políticas sanitarias en la provincia de Santa Fe primera mitad del siglo XX

El presente trabajo indaga las dinámicas de transformación de las políticas sanitarias en la provincia de Santa Fe en la primera mitad del siglo XX, focalizando tres coyunturas: en primer lugar, el contexto previo y la sanción de la ley de sanidad en 1932; en segundo término, los cambios sostenidos durante la segunda mitad de la década de 1930 que darían lugar a la creación del Ministerio de Salud y Trabajo en 1941; finalmente las innovaciones proyectadas desde la intervención de 1943 y los posteriores gobiernos peronistas. A partir de los debates parlamentarios, las memorias ministeriales, la prensa y las publicaciones especializadas, nos proponemos dar cuenta de algunos aspectos de este proceso de transformación en las políticas sanitarias locales en diálogo con el plano nacional.

Nuevas capacidades estatales para una sociedad transformada : Instituciones y políticas sanitarias en la provincia de Santa Fe primera mitad del siglo XX

El presente trabajo indaga las dinámicas de transformación de las políticas sanitarias en la provincia de Santa Fe en la primera mitad del siglo XX, focalizando tres coyunturas: en primer lugar, el contexto previo y la sanción de la ley de sanidad en 1932; en segundo término, los cambios sostenidos durante la segunda mitad de la década de 1930 que darían lugar a la creación del Ministerio de Salud y Trabajo en 1941; finalmente las innovaciones proyectadas desde la intervención de 1943 y los posteriores gobiernos peronistas. A partir de los debates parlamentarios, las memorias ministeriales, la prensa y las publicaciones especializadas, nos proponemos dar cuenta de algunos aspectos de este proceso de transformación en las políticas sanitarias locales en diálogo con el plano nacional.

Nuevas capacidades estatales para una sociedad transformada : Instituciones y políticas sanitarias en la provincia de Santa Fe primera mitad del siglo XX

El presente trabajo indaga las dinámicas de transformación de las políticas sanitarias en la provincia de Santa Fe en la primera mitad del siglo XX, focalizando tres coyunturas: en primer lugar, el contexto previo y la sanción de la ley de sanidad en 1932; en segundo término, los cambios sostenidos durante la segunda mitad de la década de 1930 que darían lugar a la creación del Ministerio de Salud y Trabajo en 1941; finalmente las innovaciones proyectadas desde la intervención de 1943 y los posteriores gobiernos peronistas. A partir de los debates parlamentarios, las memorias ministeriales, la prensa y las publicaciones especializadas, nos proponemos dar cuenta de algunos aspectos de este proceso de transformación en las políticas sanitarias locales en diálogo con el plano nacional.

How the World Learned to Stop Worrying and Love Failure: Big Data, Resilience and Emergent Causality

In modernity, failure was the discourse of critique, today, it is increasingly the discourse of power: failure has changed its allegiances. Over the last two decades, failure has been enfolded into discourses of power, facilitating the development of new policy approaches. Foremost among governing approaches that seek to include and to govern through failure is that of resilience. This article seeks to reflect upon how the understanding of failure has become transformed in this process, particularly linking this transformation to the radical appreciation of contingency and of the limits to instrumental cause-and-effect approaches to rule. Whereas modernity was shaped by a contestation over failure as an epistemological boundary, under conditions of contingency and complexity there appears to be a new consensus on failure as an ontological necessity. This problematic ‘ontological turn’ is illustrated using examples of changing approaches to risks, especially anthropogenic understandings of environmental threats, formerly seen as ‘natural’.