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RISS 인기검색어
- 검색키워드
- 저자 : Rettig, Heike (검색결과 5 건)
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Rettig, Andrew J University of Cincinnati ProQuest Dissertations & 2014 해외박사(DDOD)
소속기관이 구독 중이 아닌 경우 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.
This dissertation documents the design and implementation of a near-real-time geospatial in situ sensor network for monitoring stormwater runoff at the Green Learning Station. The project solves the need by the Environmental Protection Agency and Cincinnati Metropolitan Sewer District for an affordable and standardized network. The project also makes contributions to geospatial standards and sensor web research. This dissertation uses open innovation, including open standards, to help reduce cost and complexities of environmental sensor networking architectures. Article 1 focuses on the technical implementation of the in situ sensor network helping to fill the research gap of applied end-to-end in situ sensing. This gap is further highlighted by the inadequacies within international geospatial standards. Article 2 discusses the greatest hardware challenge within sensor webs, embedded devices. The Green Learning Station project solved this challenge, bridged the gap between sensor protocols and standard communication protocols, with Common-off-the-Shelf (COTS) routers. The modified routers enable the development of the client/server architecture for environmental sensor networking outlined in Article 3. The client software is designed for embedded devices while the web services were designed with the Representational State Transfer (REST) approach. The Green Learning Station design and implementation is unique because of the open innovation approach to geospatial in situ sensor webs by a team of engineers with expertise at every layer of the architecture. This expertise enabled the inclusion of spatial standards and spatial data throughout the architecture. This approach creates a standardized and affordable geospatial sensor network as an example for others to study and expand upon for a variety of monitoring solutions.
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Interactions in a stage-structured species: Impacts of adult bluegill on larval growth and survival
Rettig, Jessica Erin Michigan State University 1999 해외박사(DDOD)
소속기관이 구독 중이 아닌 경우 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.
The bluegill sunfish (<italic>Lepomis macrochirus</italic>) is a stage-structured species with three ecologically distinct life history stages: larvae, juveniles, and adults. While several studies have explored the ecology of the adult stage and the juvenile stage, relatively little is know about the ecology of the larval life stage. Given this lack of knowledge, this dissertation seeks to explore the ecology of larval bluegill by examining three areas: (1) the distribution of larval in lakes in S.W. Michigan, (2) the effect of variation in prey (zooplankton communities) on the growth and survival of larval bluegill, and (3) the potential for direct and indirect interactions between the adult life stage and the larval life stage. In examining the distribution of larvae, I used protein electrophoresis to identify larval caught in four lakes. I found that bluegill dominate the larval assemblage of some lakes but not others. In addition, the proportional contribution of different species to the larval assemblage can vary through time and among lakes, highlighting the dynamic nature of larval fish assemblages. Finally, larval assemblages may or may not reflect the distribution of adult species. This variation in larval assemblages and potential for larval assemblages not to reflect adult fish communities points to the difficulty in studying many aspects of larval ecology in lakes because the identity of larvae must be known before comparisons among species or lakes can be made. I examined the effect of zooplankton variation in larval growth and survival using an enclosure experiment with two types of zooplankton communities, large-bodied and small-bodied. I found that larval survival was higher for larvae foraging on the small-bodied zooplankton community, but larval growth did not differ between the two communities. In addition, larval density played a strong role in influencing larval growth, with relative growth declining as larval density increased, resulting in significant density dependent effects on the final mass of larvae. While simple dichotomies of large versus small zooplankton may not explain the variation in larval growth seen in local lakes, differences in larval density among lakes may contribute to patterns of larval growth. I used a field manipulation of adult and larval bluegill to examine potential interactions between adults and larvae. I found strong evidence that adult bluegill affect larval bluegill by foraging on the zooplankton community, a resource that both stages utilized. I also found that adults forage on aquatic insects, which are predators of larval bluegill, producing a positive indirect effect of adults on larvae. Finally, I found no indication that adults cannibalize larval bluegill. The presence of these interactions emphasizes the potential importance of interstage dynamics between adults and larvae beyond simple direct methods of birth and recruitment from stage to stage. Such interactions may play an important role in the population dynamics of bluegill in lakes.
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From Aesthetic to Pathology: Reading Literary Case Studies of Melancholy, 1775-1830
Rettig, Noelle B ProQuest Dissertations & Theses Georgetown Univers 2019 해외박사(DDOD)
소속기관이 구독 중이 아닌 경우 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.
This dissertation contributes to the ongoing discussion of the narrative representation of mental illness in the late-eighteenth and early-nineteenth centuries, at a time when the nascent discipline of psychology began to come into its own, and the discourses of mind and body were renegotiated under advances in the medical sciences.
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Higher Accuracy, Lower Cost: Developments in Molecular and Periodic Electronic Structure Theory
Rettig, Adam University of California, Berkeley ProQuest Disser 2023 해외박사(DDOD)
소속기관이 구독 중이 아닌 경우 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.
Proper applications of electronic structure theory use the most accurate computational method that is feasible for the system size of interest. Modern electronic structure theory methods therefore seek to maximize the ratio of accuracy to computation time. To improve upon an existing method, one must therefore either increase the accuracy or lower the computational cost. In this work, we present techniques for both. In Chapter 2, we present a study of regularized orbital optimized second order Moller-Plesset theory (OOMP2) and provide an analysis of appropriate empirical parameters across a broad spectrum of chemical systems - yielding a factor of 9 reduction in error over unregularized OOMP2 for certain classes of problems! In Chapter 3, we present a new algorithm utilizing tensor hypercontraction to compute exact exchange for periodic systems including k-point sampling; this approach significantly reduces the computation time and memory usage for hybrid density functional theory (DFT) when large k-point meshes are used. In Chapter 4, we analyze the effect of orbitals in third order Moller-Plesset theory (MP3), showing that DFT orbitals can yield a factor of 3 reduction in error over the more traditional Hartree-Fock orbitals for many applications at no extra computational cost. Finally, in Chapter 5 we utilize MP3 with DFT orbitals to compute reaction energies and reaction rate constants for an experimentally observed reaction and use these to predict the product, which the experiment could only characterize by molecular weight.
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