Com o desenvolvimento dos motores turbofan, a contribuição das estruturas hipersustentadoras no ruído total gerado pelas aeronaves tem se tornado mais considerável. Sendo que as estruturas do flape tornaram-se uma das principais fontes de ruído. Dispositivos para redução do nível sonoro nessas regiões são investigados em uma asa MD 30P30N, ensaiada em um túnel de vento adaptado para medições aeroacústicas. A localização das fontes de ruído foi obtida através de uma antena de Beamforming (técnica de identificação de fontes acústicas) com 109 microfones, dos quais 60 deles são de alta freqüência (até 40 kHz). As características aerodinâmicas foram avaliadas através de medidas de pressão na superfície do modelo, e com o mapeamento de vórtice em ponta de flape. Dentre os dispositivos avaliados para redução de ruído, foram testadas chapas porosas de diversos tamanhos. Os sinais dos microfones foram processados com o algoritmo DAMAS2 para obtenção dos espectros do Beamforming em uma região de interesse definida. As configurações com porosidade têm nível de ruído equivalente para freqüências até 2000 Hz. A partir daí, há uma redução de até 6 dB em 3200 Hz em relação ao baseline (tipo de teste aplicado à asa). Os resultados de Beamforming para duas configurações diferentes, baseline e chapa porosa foram apresentados usando uma faixa dinâmica de 12 dB, com pico de 58 dB. Observa-se que houve redução dos níveis de ruído na região selecionada. A perda de pressão total na ponta do flape mostrou que há uma aparente correlação entre o gradiente da pressão total e o nível de ruído. Estudos adicionais são necessários para entender os mecanismos de redução de ruído e assim otimizar a geometria das chapas porosas. No entanto, os resultados apresentados indicam que esses dispositivos são candidatos para aplicação em aeronaves. / With the development of high-bypass turbofan engines, the airframe contribution to the total aircraft noise has become considerable. One of the largest sources of airframe noise is the flap side-edge, which is investigated experimentally in a MD 30P30N wing. Several devices are also tested to reduce the side-edge noise, especially porous plates. Wind tunnel testing is carried out and the position of noise sources and their levels is obtained with a beamforming antenna. It has 112 microphones, in which 60 of them are suitable for acoustic measurements of up to 40 kHz. The aerodynamic characteristics are evaluated with pressure measurements on the model surface, as well as with vortex mapping on the flap side-edge. To evaluate the noise levels, microphone signals were processed with the DAMAS2 algorithm. Beamforming spectra were then obtained considering only the side-edge region. The baseline configuration and those with porous plates were tested and equivalent noise levels were obtained up to 2000 Hz. For higher frequencies, the model with porous plates has a lower noise level, reaching a difference of 6 dB in 3200 Hz, compared to the baseline configuration. Vortex mapping was carried out with a seven hole Pitot probe developed at the University for the measurement of flows with high angularity. The results for the baseline configuration allows to correlate aerodynamic and aeroacoustic data. This helps to design the side-edge region with a low noise level. Additional studies are necessary to understand the mechanisms of noise reduction and to optimize the geometry of the porous plate. However, the presented results indicate that this device is a candidate for application in aircraft, in special by its superior durability compared to the foam generally used for noise attenuation.

Com o desenvolvimento dos motores turbofan, a contribuição das estruturas hipersustentadoras no ruído total gerado pelas aeronaves tem se tornado mais considerável. Sendo que as estruturas do flape tornaram-se uma das principais fontes de ruído. Dispositivos para redução do nível sonoro nessas regiões são investigados em uma asa MD 30P30N, ensaiada em um túnel de vento adaptado para medições aeroacústicas. A localização das fontes de ruído foi obtida através de uma antena de Beamforming (técnica de identificação de fontes acústicas) com 109 microfones, dos quais 60 deles são de alta freqüência (até 40 kHz). As características aerodinâmicas foram avaliadas através de medidas de pressão na superfície do modelo, e com o mapeamento de vórtice em ponta de flape. Dentre os dispositivos avaliados para redução de ruído, foram testadas chapas porosas de diversos tamanhos. Os sinais dos microfones foram processados com o algoritmo DAMAS2 para obtenção dos espectros do Beamforming em uma região de interesse definida. As configurações com porosidade têm nível de ruído equivalente para freqüências até 2000 Hz. A partir daí, há uma redução de até 6 dB em 3200 Hz em relação ao baseline (tipo de teste aplicado à asa). Os resultados de Beamforming para duas configurações diferentes, baseline e chapa porosa foram apresentados usando uma faixa dinâmica de 12 dB, com pico de 58 dB. Observa-se que houve redução dos níveis de ruído na região selecionada. A perda de pressão total na ponta do flape mostrou que há uma aparente correlação entre o gradiente da pressão total e o nível de ruído. Estudos adicionais são necessários para entender os mecanismos de redução de ruído e assim otimizar a geometria das chapas porosas. No entanto, os resultados apresentados indicam que esses dispositivos são candidatos para aplicação em aeronaves. / With the development of high-bypass turbofan engines, the airframe contribution to the total aircraft noise has become considerable. One of the largest sources of airframe noise is the flap side-edge, which is investigated experimentally in a MD 30P30N wing. Several devices are also tested to reduce the side-edge noise, especially porous plates. Wind tunnel testing is carried out and the position of noise sources and their levels is obtained with a beamforming antenna. It has 112 microphones, in which 60 of them are suitable for acoustic measurements of up to 40 kHz. The aerodynamic characteristics are evaluated with pressure measurements on the model surface, as well as with vortex mapping on the flap side-edge. To evaluate the noise levels, microphone signals were processed with the DAMAS2 algorithm. Beamforming spectra were then obtained considering only the side-edge region. The baseline configuration and those with porous plates were tested and equivalent noise levels were obtained up to 2000 Hz. For higher frequencies, the model with porous plates has a lower noise level, reaching a difference of 6 dB in 3200 Hz, compared to the baseline configuration. Vortex mapping was carried out with a seven hole Pitot probe developed at the University for the measurement of flows with high angularity. The results for the baseline configuration allows to correlate aerodynamic and aeroacoustic data. This helps to design the side-edge region with a low noise level. Additional studies are necessary to understand the mechanisms of noise reduction and to optimize the geometry of the porous plate. However, the presented results indicate that this device is a candidate for application in aircraft, in special by its superior durability compared to the foam generally used for noise attenuation.

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Thesis (Ph.D.) - Universidad Nacional Autonoma de Mexico, 2009.

Thesis (M.Sc.)--York University, 2008. Graduate Programme in Physics and Astronomy. / Typescript. Includes bibliographical references (leaves 108-110). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:MR38824

Thesis (M.Sc.)--York University, 2007. Graduate Programme in Physics and Astronomy. / Typescript. Includes bibliographical references (leaves 105-109). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:MR38804

As drilling for natural gas in the Marcellus Shale becomes increasingly prevalent, both human safety and environmental concerns have arisen. The aim of this study was to assemble an environmental baseline to make an accurate assessment of its possible impacts. Water samples and chemical parameters were collected from Bates Fork, a stream with Marcellus Shale drilling activity and Fonner Run, a sister stream with no drilling activity, on a monthly basis beginning in the summer of 2010. Bacterial DNA was also extracted from water collected at each site and then amplified using primers for the variable ribosomal internal transcribed spacer (ITS) region of 16S and 23S rRNA. The bacterial ribosomal ITS has both sequence and length variability, which can be used to approximate species abundance and diversity along both streams. The conserved 16S rRNA gene was also amplified, and sequenced to taxonomically categorize organisms. To date, it has been observed that Bates Fork has consistently higher conductivity and chloride levels than Fonner Run. The bacterial diversity was found to be similar between the two streams. As a baseline study, these results show that there have not been any detectable impacts to Bates Fork thus far, but the stream should continue to be monitored. / Bayer School of Natural and Environmental Sciences / Biological Sciences / MS / Thesis

The purpose of this study is to establish the background metal concentrations of several demersal aquatic organisms in the coastal waters off Yunlin county before the development of petroleum industries camp at Tai-shi area, S. W. Taiwan. In addition to, the proper bioindicators are also investigated for future monitoring purpose. Twenty-seven species of sedimentary organisms, including 11 species of fishes, 3 species of crabs, 9 species of shrimps, 2 species of mollusca, and 2 species of cephalopods were collected in 5 seasons from September 1998 to November 1999. Metal concentrations of Ag, As, Cd, Co, Cu, Fe, Hg, Mn, Se and Zn were analyzed in the muscles and internal organs. The results showed that metal concentrations were significantly different according to species and tissues. Muscle concentrations of As, Fe and Zn were higher in fish, shrimp and cephalopod, whereas Zn, Cu and As were in crab, and Fe and Zn in mollusca. In the internal organs, Fe concentrations were the highest metal contents of fish and mollusca, but Cu were the highest for crab and shrimp. Nevertheless, Fe and Cu concentrations were respectively the highest elemental contents in two species of cephalopods, Octopus ocellatus and Sepiotenthis lessoniana. In gonads, Zn was the highest metal concentration in both gender of fish. However, in crab, Cu and Zn were respectively the highest metal concentrations of Portunus pelagicus and Charybdis hellerii. Among the all, Ag, Co, Cd and Hg showed the lowest concentrations in the species. In most cases, the metal concentrations of internal organs were higher than those of muscles, except Ag and Hg turned out to be reverse. The mean metal concentrations found in this study were similar to those measured in uncontaminated waters worldwide, so that it represents the background values of the aquatic demersal organisms in Yin-lin waters. The metal concentrations in the editable parts of the organisms were all below the food safety standard worldwide. Among the 10 metals analyzed, only As, Se and Zn concentrations of gonad showed the gender-differences. A positive correlation between a metal concentration and the body size were found in several cases, e. g. Ag in internal organs of Neverita lineata, As in muscles of Penaeus cornutus, Hg in muscles of Sillago sihama, Penaeus cornutus, Penaeus hardwickii and Neverita didyma, and Zn in hepatopancrea of Portunus pelagicus. However, Zn in viscera of Neverita didyma revealed a negative correlation to the size. Seasonal variations of metal concentrations were also found in the internal organs of most species. The concentrations of Cu, Fe, Mn, Se, Zn and As of internal organs showed a peak in both February and April, which may relate to the seasonal in put of anthropogenic pollutants in the area. Based on the metal concentrations of internal organs, the ratio of internal organ to muscle and the relative deviations, we suggest Octopus ocellatus, Portunus sanguinolentus (great for Ag, Cd, Co, Cu, Se and Zn), Penaeus cornutus (great for As and Cd), Neverita didyma(great for Co, Hg and Zn) and Arius maculatus(great for Fe, Se and Zn), which potentially concentrated high levels of metals, could be the good bioindicators in future.

Thesis (Ph. D.)--University of Kentucky, 2003. / Title from document title page (viewed onJune 1, 2004). Document formatted into pages; contains ix, 106 leaves : ill. (some col.). Includes abstract and vita. Includes bibliographical references (p. 99-104).