Thesis (Ph. D.)--School of Materials Science and Engineering, Georgia Institute of Technology, 2004. Directed by Ashok Saxena. / Includes bibliographical references (leaves 143-146).

Thesis (M.S.)--West Virginia University, 2001. / Title from document title page. Document formatted into pages; contains xiv, 106 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 90-92).

Thesis (M.S.)--Mississippi State University. Department of Mechanical Engineering. / Title from title screen. Includes bibliographical references.

Thesis (Ph. D.)--West Virginia University, 2003. / Title from document title page. Document formatted into pages; contains xiv, 185 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 170-176).

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Wind turbines are a cleaner alternative to non-renewable energy, such as fossil fuels, and therefore help to decrease deleterious climate change.[1] Species protection is needed to preserve biodiversity, which is important to all species.[2] It is claimed, how­ever, that between these interests there is a contradiction. Climate change kills birds, but so do wind turbines. According to some, the expansion of wind power is at risk, being hindered by the rules on protected birds, incorrectly interpreted in art­skyddsförordningen[3], the Swedish counterpart to international species conventions and the EU Birds directive[4].[5] The Birds directive and artskyddsförordningen prohibits activi­ties that deliberately kill, capture or disturb migratory birds in the EU (art. 5 Birds directive and 4 § artskyddsförordningen). Mark- och miljööverdomstolen has for some years made the assessment that the establishment and operation of wind turbines may be prohibited by reason of the protection of species, even though the purpose of wind power is to produce electricity and not to kill birds.[6] Due to the legal uncertainty, this essay seeks to find out whether wind energy can fall within art­skyddsförordningens prohibitions and if so, when. This is done through a legal dog­matic method, complemented with a comparative section. The legal situation is not clear, but after a thorough examination of the origin of the Birds directive, previous case law, new disputed ruling by Mark- och miljööver­domstolen, Danish and German case law, ECJ rulings and guidance documents from the European Commission, in total it seems that an inappropriate placement of wind farms or plants can and sometimes should be seen as a deliberate act in respect of the Birds directive and consequently artskyddsförordningen. That is, unless it is possible to under­take precautionary measures, which neutralizes the act. It also appears that art­skyddsförordningen still is to be applied within chapter 2 miljöbalken[7], in the case of species protection. [1] SOU 1999:75, s. 29 f. [2] SOU 2004:37, s. 189. [3] Artskyddsförordningen (2007:845). [4] Directive 2009/147/EC of the European parliament and of the council of 30 November 2009 on the conservation of wild birds. [5] Mark- och miljööverdomstolen har klargjort att vindkraft inte innebär ett avsiktligt dödande eller störande enligt artskyddsförordningen – kommentar av Magnus Fröberg och Hedvig Ekdahl, 2015-01-23, JP Infonet. [6] Se exempelvis MÖD 2013:13. [7] Miljöbalken (1998:808).

The work discussed in this thesis provides a review of pertinent literature, a design methodology, analytical model, concept generation and development, and conclusions about energy harvesting to provide long-term power for bridge health monitoring. The methodology gives structure for acquiring information and parameters to create effective energy harvesters. The methodology is used to create a wind energy harvester to provide long-term power to a wireless communication network. An analytical model is developed so the system can be scaled for different aspects of the network. A proof of concept is constructed to test the methodology's effectiveness, and validate the feasibility and analytical model. / text

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With strict environmental regulations, gas turbine emissions have been heavily constrained. This requires operating conditions wherein thermo-acoustic flame instabilities are prevalent. During this process the combustor acoustics and combustion heat release fluctuations are coupled and can cause severe structural damage to engine components, reduced operability, and inefficiency that eventually increase emissions. In order to develop an engine without these problems, there needs to be a better understanding of the physics behind the coupling mechanisms of this instability. Among the several coupling mechanisms, the “velocity coupling” process is the main focus of this thesis. The majority of literature has treated axisymmetric disturbance fields which are typical of longitudinal acoustic forcing and axisymmetric excitation of ring vortices. Two important non-axisymmetric disturbances are: (1) transverse acoustics, in the case of circumferential modes of a multi-nozzle annular combustor and (2) helical flow disturbances, seen in the case of swirling flow hydrodynamic instabilities. With significantly less analytical treatment of this non-axisymmetric problem, a general framework is developed for three-dimensional swirl-stabilized flame response to non-axisymmetric disturbances. The dynamics are tracked using a level-set based G-equation applicable to infinitely thin flame sheets. For specific assumptions in a linear framework, general solution characteristics are obtained. The results are presented separately for axisymmetric and non-axisymmetric mean flames. The unsteady heat release process leads to an unsteady volume generation at the flame front due to the expansion of gases. This unsteady volume generation leads to sound generation by the flame as a distributed monopole source. A sound generation model is developed where ambient pressure fluctuations are generated by this distributed fluctuating heat release source on the flame surface. The flame response framework is used to provide this local heat release source input. This study has been specifically performed for the helical flow disturbance cases to illustrate the effects different modes have on the generated sound. Results show that the effects on global heat release and sound generation are significantly different. Finally, the prediction from the analytical models is compared with experimental data. First, a two-dimensional bluff-body stabilized flame experiment is used to obtain measurements of both the flow and flame position in time. This enables a local flame response comparison since the data are spatially resolved along the flame. Next, a three-dimensional swirl-stabilized lifted flame experiment is considered. The measured flow data is used as input to the G-equation model and the global flame response is predicted. This is then compared with the corresponding value obtained using global CH* chemilumenescence measurements.