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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 36 for “"rewetting"”.
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Rewetting Temperature During Top and Bottom Reflood
Made available in DSpace on 2017-07-06T18:56:22Z (GMT). No. of bitstreams: 2 Siegel_Alan_D_MS.pdf: 51485799 bytes, checksum: f0352a352d8b1c48211ca671f4c53089 (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1979
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Impact of self-rewetting aqueous solutions on boiling with advanced heat transfer applications
… experiments have been conducted with self-rewetting fluids consisting of aqueous butanol and pentanol solution to study the boiling heat transfer enhancement at pressures of 1 ~ 4 bars. Although self-rewetting fluids have been used to enhance the performance of heat pipes, boiling heat …
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Carbon budget of a drained peatland in Western Iceland and initial effects of rewetting
… restoration has increased and since 2011 wetland rewetting is a possible method for reducing emissions within the Kyoto Protocol´s second commitment period. This study examined the carbon fluxes from an uncultivated drained peatland in Iceland and estimated the annual CO2 budget. During the …
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Legacy effects of temperature alterations on microbial resistance and resilience to drying and rewetting
… community affect its response to a drying and rewetting event in terms of resilience and resistance, as well as how these strategies can affect carbon dynamics in subarctic ecosystems. I achieved this by taking soil samples from study sites that have undergone two-year warming in Abisko, …
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The influence of leaf litter and plants on soil respiration before, during and after a severe drought
… areas during drought and immediately after rewetting can have a substantial impact on how soil carbon is stored. Soil respiration increases with addition of organic material, which also facilitates the release of stored carbon in the soil; known as a 'priming effect'. In addition, soils that …
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Gross N turnover and soil solution chemistry as influenced by fluctuations of soil water potential and water table in a Podzol and a fen soil
… scenarios, the higher frequency of drying/rewetting cycles of soils in the future can be expected. These changes of the meteorological conditions likely result in an increasing frequent and intensive drought periods in summer, causing irregular and extreme drought stress in forest soils or …
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Turnover and fluxes of carbon and nitrogen in a spruce forest under natural and extreme meteorological conditions
… of soil organic matter. The influence of drying/rewetting (A/W) and freezing/thawing (G/A) events on solution chemistry and leaching losses of soils is barely known. This thesis aimed to study the effects of A/W and G/A events on soil solution chemistry and solute fluxes, in particular, of …
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The spatiotemporal dynamics of bacterial and fungal abundance in Great Plains non-perennial streams
… of microbial populations to stream drying and rewetting is not well understood. Thus, learning more about the sensitivity of aquatic microbiomes to drying and rewetting cycles will improve our ability to assess future impacts to water quality. We predicted that greater hydrological connectivity …
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Wettability of candidate Accident Tolerant Fuel (ATF) cladding materials in LWR conditions
… consequently, the critical heat flux (CHF) and rewetting temperatures, which are important thermal limits for LWRs. Surface wettability determines nucleation site density, bubble departure diameter, and bubble departure frequency.
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Evaluating blanket mire vegetation recovery following hydrological restoration, with specific focus on the influence of Molinia caerulea
… vegetation restoration following hydrological rewetting and evaluates the role of Molinia caerulea tussock development as a barrier to blanket mire vegetation establishment. Using data collected from restoration pools and terrestrial peat surfaces across blanket bog habitats on Dartmoor …
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Effects of climate change on plants and ecosystem functioning : Implications for managed temperate grasslands
… 4). Furthermore, plant N status was altered by rewetting and harvest delay after drought (manuscript 3). Harvest delay after rewetting could not compensate the negative effects of drought on biomass production, but increased plant N concentration and N content. A detailed quantification of …
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Investigation of the pool boiling heat transfer enhancement of nano-engineered fluids by means of high-speed infrared thermography
… during nucleate boiling, critical heat flux, and rewetting on thin-film heating elements. A significant focus of the work was to investigate and explain the modification of these heat transfer phenomena through the addition of silica and diamond nanoparticles to the working fluid. Bubble departure …
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Microbial Diversity in Young Volcanic Soils
… can be used to identify changes due to rewetting of dry- stored soils, and potentially r- or k-selected taxa and their response to increased temperature. This study of microbial communities can be linked to carbon respiration and soil properties to better understand the effect of …
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Analysis of reverse flow restriction device to prevent fuel dryout during loss of coolant and instability accidents of boiling water reactors
… due to sustained dryout without timely rewetting. For LOCA, the device is capable of containing the coolant inside the core during the blowdown and when activating the emergency systems which keep the peak clad temperature at lower levels. Moreover, the RFRD achieved the reflood phase …
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Nano-engineering the boiling surface for optimal heat transfer rate and critical heat flux
… a large hydrophilic region to allow for rewetting of the surface during the ebullition cycle and thus maintaining a high critical heat flux. The patterned surfaces exhibited similar critical heat fluxes and heat transfer coefficients to the surfaces that were only modified with …
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Application of Optical Fiber Sensors for Quenching Temperature Measurement
… and surface roughnesses, will be discussed. The rewetting temperature measurement is performed to compare results between thermocouples and optical fiber sensors in a 30 cm rod. These results are further discussed with regard to future application in two-phase flow experiments.
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Assessing the variability of soil nitrogen mineralization
… anaerobic incubation, CO₂ evolved 1 day after rewetting, and N released on autoclaving) measurements to determine if the field N mineralization could be predicted by a laboratory test. Nitrogen mineralization in the field was highest in May and declined during the growing seasons. Patches of …
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The response of grassland carbon cycling to drought events and changes in nutrient availability
… events, such as drought and the subsequent rewetting event. Yet the effect of drought events will not be consistent across grassland communities, instead likely varying with grassland properties. One such property may be the level of nutrient availability, which brings about changes in plant …
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Dynamics of soil processes under extreme meteorological boundary conditions - response of below-ground carbon, sulfur, and iron cycling in fen soils
… study the effects of more pronounced drying and rewetting events on redox processes of carbon, iron, and sulphur – and concomitantly arsenic – in an electron acceptor rich fen-ecosystem. In contrast to some existing studies, we could not find a notable effect of the drying/wetting treatment on …
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Impact of extreme hydrological conditions on belowground carbon cycling and redox dynamics in peat soils from a northern temperate fen
… acceptors. The opposite trend occurred upon rewetting with pulses of iron and sulphate reduction and delayed methane production to a variable extent. Upon flooding, continued anaerobic conditions stimulated the accumulation of reduced products, methanogenic precursors (acetate and hydrogen) …
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