Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 715 for “"proxies"”.
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Miocene paleoenvironments and paleosol pH proxies.
… studies and the development of a new suite of proxies for soil pH. The first case study was performed at Coffee Ranch, the site of a late Miocene (6.6 Ma) bonebed in the Texas Panhandle. Using sedimentology, stratigraphy, and paleopedology, the depositional environments at Coffee Ranch were …
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Predicting content manipulations by open web proxies
… anonymity and privacy has given rise to open web proxies that act as gateways relaying traffic between web servers and their clients, allowing users to access otherwise not accessible content. As the open web proxy ecosystem continues to grow, more and more studies point out the extent of content …
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Low-bandwidth Web access with tandem proxies
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Increasing DoS-Resilience for Cross-Protocol Proxies
Industry is reporting increasingly damaging and popular application layer Denialof-Service (DoS) attacks. Therefore, now more than ever before, it is important to develop mitigations to DoS attacks generally, and application layer DoS attacks in particular. The challenge of this work is that …
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EASTERN EQUATORIAL PACIFIC PRODUCTIVITY VIA TWO GEOCHEMICAL PROXIES
… Leg 138). Using a Ba/Ti and P/Ti proxy (“excess” proxies), distinct productivity variations during glacial and interglacial periods were observed. While the age model for these sites has been estimated, the observed variations more than likely agree with high productivity during glacial periods …
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Climate proxies in planktic foraminifera: Environmental or biomineralisation controls?
… in foraminiferal fossils have been applied as proxies to reconstruct ocean environments over geological time. However, the proxy-environment correlations often vary among species and individuals, indicating different degrees of biological control during calcification. This introduces …
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Methane cold seeps: Paleo proxies, modern measurements, and instrument development
… the application of carbonate clumped isotope proxies (Chapters 5 and 6). Taken as a whole, this dissertation presents a cross-disciplinary exploration of CH4 seeps in marine settings and advances our understanding of dynamics and controls on CH4 seepage in the modern ocean and geological past.
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Leveraging lower fidelity proxies for neural network based NAS predictors
Výkonnosť neurónovej siete je závislá od viacerých faktorov, vrátane jej architek- túry. Pole výskumu prehľadávania architektúr neurónových sietí (NAS) tvorí dôležitú časť automatického strojového učenia (AutoML), keďže sa zameriava na automatizá- ciu dovtedajšieho manuálneho hľadania najlepšej …
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Developing iodine proxies for oceanic oxygenation conditions during greenhouse episodes
… exacerbated by a lack of sensitive redox proxies, especially at the interface between oxic and anoxic conditions. To address this problem, I use I/Ca in bulk carbonate and I/TOC in black shale to reconstruct redox changes in the upper and deep waters in multiple ocean basins through the …
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Development of biomarker-based proxies for paleo sea-ice reconstructions
… extent. However, the use of such biomarker proxies remains under development. In the current study, a number of additional palaeoceanographic developments of HBIs as sea-ice biomarkers in both polar regions has been undertaken. For the Arctic, an investigation into the combined analysis of …
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Aquatic macrophyte-derived biomarkers as palaeolimnological proxies on the Tibetan Plateau
The Tibetan Plateau is the largest elevated landmass in the world and profoundly influences atmospheric circulation patterns such as the Asian monsoon system. Therefore this area has been increasingly in focus of palaeoenvironmental studies. This thesis evaluates the applicability of organic …
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Secure channel establishment in disadvantaged networks : TLS optimization using intercepting proxies
… is achieved by deploying two specialized TLS proxies across such links. Working in tandem, one proxy will replace certificate data in packets being sent across the disadvantaged link with a short reference, while the proxy on the other side of the link will restore the certificate data in the …
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Biogeochemical proxies for environmental and biotic conditions at the Permian-Triassic boundary
… fossils in sedimentary rocks that serve as proxies to measure the conditions that prevailed during deposition. In this thesis, biomarkers for redox conditions, depositional environment, microbial community and potential age-related biomarkers have been measured and are reported from four …
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Antarctic phytoplankton and climate change using Holocene sedimentary DNA, fossils and chemical proxies.
The West Antarctic Peninsula (WAP) is one of Earth’s fastest-warming regions, of particular concern given its marine-based ice sheets. Since the 1950s, mean air temperature has risen by ~2°C, and most glaciers are retreating with several ice shelves having already thinned or collapsed. Strengthened …
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Developing proxies for routine measurement of ore hardness: A mineral sands case study
… has been conducted to develop geometallurgical proxies to predict ore hardness. Geometallurgical proxies refer to indirect data that can be correlated with direct hardness measurements. Literature shows that the correlations between proxy data and direct hardness measurements vary depending on …
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Little Ice Age climate in the Western Tropical Atlantic inferred from coral geochemical proxies
Paleoclimate archives place the short instrumental record of climate variability in a longer temporal context and allow better understanding of the rate, nature and extent by which anthropogenic warming will impact natural and human systems. The ocean is a key component of the climate system and …
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Developing Levitation Laser-Fused Glasses as Proxies for Lower Mantle Experiments: a Methodological Approach
… anvil cell experiments, where they can act as proxies for an otherwise inaccessible area of the Earth. In addition to the development of this methodology, two web applications produced during this research aid in visualization of both data logs and analytical results.
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Socio-economic status proxies in studies of fertility in developing countries : measures and methods
… compare the consequences of using the different proxies on the estimated impact of socio-economic status and the other determinants of fertility.
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Little Ice Age climate in the western tropical Atlantic inferred from coral geochemical proxies
Paleoclimate archives place the short instrumental record of climate variability in a longer temporal context and allow better understanding of the rate, nature and extent by which anthropogenic warming will impact natural and human systems. The ocean is a key component of the climate system and …
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Coral biomineralization, climate proxies and the sensitivity of coral reefs to CO₂-driven climate
Scleractinian corals extract calcium (Ca²⁺) and carbonate (CO₃²⁻) ions from seawater to construct their calcium carbonate (CaCO₃) skeletons. Key to the coral biomineralization process is the active elevation of the CO₃²⁻ concentration of the calcifying fluid to achieve rapid nucleation and growth …
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