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RISS 인기검색어
- 검색키워드
- 저자 : Nazareth, Julie Jeannine (검색결과 3 건)
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The structure of the crust and distribution of earthquakes in southern California
Nazareth, Julie Jeannine California Institute of Technology 2002 해외박사(DDOD)
소속기관이 구독 중이 아닌 경우 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.
The lithologically and tectonically complex crust of southern California and the current broad deformation zone accommodating the relative motion between the Pacific and North American plates, result in significant variations in style, depth distribution, and rate of earthquakes, and thus also in the seismic hazard across southern California. Although the thickness of the seismogenic crust is an important parameter in seismic hazard analysis, it has never been determined systematically for southern California. Seismogenic thickness can be predicted by the depth distribution of the moment release of regional seismicity. The seismogenic thickness of southern California is highly variable, ranging from less than 10 km in the Salton Trough to greater than 25 km at the southwestern edge of the San Joaquin Valley. On average, the seismogenic thickness of southern California is 15.0 km. Seismogenic thickness along the major strike slip systems of southern California can vary significantly along strike. Fault segmentation based upon surface features does not correspond to the variation in seismogenic thickness and thus the potential down-dip width of the fault. A model of the broad scale features of the crust and upper mantle structure of the borderland-continent transition zone adjacent to Los Angeles constrains the crustal thickness and the location and width of the transition zone. The data require the Moho to deepen significantly to the north, dramatically increasing the crustal thickness over a relatively short distance of 20–25 km. The Moho is coherent and laterally continuous beneath the Inner California Borderland and transition zone. The Inner Borderland seems to be modified and thickened oceanic crust, with the oceanic upper mantle intact beneath it. The static stress change triggering model has some validity and can be useful in explaining apparently triggered seismicity within one fault length of a large mainshock. However, because its applicability varies between different sequences, its general application to seismic hazard evaluation requires more refinement and the inclusion of parameters such as tectonic regime, regional stress state, and fault strength.
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Portfolio selection with random transaction costs
Nazareth, Marcelo Oliveira Costa The University of Chicago 2000 해외박사(DDOD)
소속기관이 구독 중이 아닌 경우 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.
I develop a model of portfolio selection in continuous time where transaction costs are random. In the model, the consumer faces a trade off between getting good terms of trade and holding a well balanced portfolio. First, I formulate the relevant control problem and prove that the value function is the unique viscosity solution of the associated Hamilton-Jacoby-Bellman equation. Next, I present a numerical procedure to solve the equation and a proof that the numerical solution converges to the true solution of the problem. The actual implementation of the procedure fully characterizes the optimal consumer behavior.
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Embedded photonic crystals for high-efficiency gallium nitride-based optoelectronic devices
Matioli, Elison de Nazareth University of California, Santa Barbara 2010 해외박사(DDOD)
소속기관이 구독 중이 아닌 경우 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.
The application of photonic crystals (PhCs) as light extractors in LEDs has evoked increased interest over recent years due to their efficacy in controlling the direction of light emission and enhancing the extraction efficiency of LEDs. This dissertation presents the study of different schemes for higher light extraction based on PhCs. The higher theoretical light extraction provided by structures with embedded PhCs compared to all the other configurations motivated a more detailed investigation of this approach. The growth of embedded air-gap PhCs by MOCVD was successfully achieved with very short grating periods (230 nm) in a two-dimensional triangular lattice. Coalescence was obtained over the air-gap PhCs with thicknesses down to 50 nmand fairly smooth surface with no extra defects created by the embedded PhCs. Embedded PhC structures were optimized using full 3D electromagnetic models. The embedded PhC LEDs presented a very high extraction efficiency of 73% for unencapsulated and 94% for silicone encapsulated devices. In addition, we developed new techniques to measure intrinsic characteristics of PhC LEDs based on high resolution angle-resolved measurements. The measurement of the extraction and dissipation properties of guided modes in PhC-LEDs revealed the competition between these two mechanisms as well as the dynamical diffraction by the 2D PhCs. These experimental techniques were used to corroborate some of our theoretical results and to compare the performances of different PhC configurations. The diffraction of the guided modes with short extraction lengths, shorter than any absorption mechanism, explains the very high extraction efficiency of the embedded PhC LEDs presented in this PhD thesis, which makes this structure an excellent candidate for high efficiency and high brightness LEDs.
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