Дисертації з теми "Soil sciences not elsewhere classified"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-26 дисертацій для дослідження на тему "Soil sciences not elsewhere classified".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Dennis, S. J. "Nitrate leaching and nitrous oxide emission from grazed grassland: upscaling from lysimeters to farm." Lincoln University, 2009. http://hdl.handle.net/10182/1269.
Повний текст джерелаFaki, Hajira. "The development and evaluation of photo-antimicrobial isoalloxazine dyes towards infection control." Thesis, University of Central Lancashire, 2018. http://clok.uclan.ac.uk/23986/.
Повний текст джерелаStampouli, Dafni. "Improved qualification of vascular abnormalities in contrast enhanced magnetic resonance angiographic images." Thesis, University of Central Lancashire, 2009. http://clok.uclan.ac.uk/19967/.
Повний текст джерелаWodike, Obelema Tonbo Seddon. "Designing a value centred inspection method for children." Thesis, University of Central Lancashire, 2016. http://clok.uclan.ac.uk/16736/.
Повний текст джерелаMcLarnon-Riches, Christian James. "The use of lipid profiles from immobilised Selenastrum capricornutum in the biological surveillance of freshwaters." Thesis, University of Central Lancashire, 2000. http://clok.uclan.ac.uk/19764/.
Повний текст джерелаLu, Chen. "Expression profile of multidrug resistance genes and proteins in cancerous and stem cells." Thesis, University of Central Lancashire, 2008. http://clok.uclan.ac.uk/19754/.
Повний текст джерелаWoodruff, Kim Therese. "The effects of anaesthetic agents on synapses of lymnaea stagnalis (L.)." Thesis, University of Central Lancashire, 2004. http://clok.uclan.ac.uk/20248/.
Повний текст джерелаChandranath, Swaminathan Irwin. "Comparitive activities and mechanisms of action of three novel antiulcer agents." Thesis, University of Central Lancashire, 2000. http://clok.uclan.ac.uk/21028/.
Повний текст джерелаHigginson, James Matthew. "Signal transduction pathways involved in skeletal muscle fibre type regulation." Thesis, University of Central Lancashire, 2003. http://clok.uclan.ac.uk/21870/.
Повний текст джерела(9792026), Remadevi Dhanasekar. "Evaluation of sediment transport formulae for estuary conditions: Boyne Estuary: case study." Thesis, 1996. https://figshare.com/articles/thesis/Evaluation_of_sediment_transport_formulae_for_estuary_conditions_Boyne_Estuary_case_study/13417112.
Повний текст джерела(9838208), David Sturgess. "Using genetic and evolutionary algorithms to solve boundary control problems in soil-water-plant interaction." Thesis, 2002. https://figshare.com/articles/thesis/Using_genetic_and_evolutionary_algorithms_to_solve_boundary_control_problems_in_soil-water-plant_interaction/13429310.
Повний текст джерела(6941345), Junrong Zha. "Modeling the Impacts of Changes in Soil Microbes and Mosses on Arctic Terrestrial Ecosystem Carbon Dynamics." Thesis, 2019.
Знайти повний текст джерела(9805679), Neil Hoy. "Establishment of trees on saline, waterlogged soils." Thesis, 1993. https://figshare.com/articles/thesis/Establishment_of_trees_on_saline_waterlogged_soils/13461608.
Повний текст джерела(8771531), Licheng Liu. "Quantifying Global Exchanges of Methane and Carbon Monoxide Between Terrestrial Ecosystems and The Atmosphere Using Process-based Biogeochemistry Models." Thesis, 2020.
Знайти повний текст джерелаMethane (CH4) is the second most powerful greenhouse gas (GHG) behind carbon dioxide (CO2), and is able to trap a large amount of long-wave radiation, leading to surface warming. Carbon monoxide (CO) plays an important role in controlling the oxidizing capacity of the atmosphere by reacting with OH radicals that affect atmospheric CH4 dynamics. Terrestrial ecosystems play an important role in determining the amount of these gases into the atmosphere. However, global quantifications of CH4 emissions from wetlands and its sinks from uplands, and CO exchanges between land and the atmosphere are still fraught with large uncertainties, presenting a big challenge to interpret complex atmospheric CH4 dynamics in recent decades. In this dissertation, I apply modeling approaches to estimate the global CH4 and CO exchanges between land ecosystems and the atmosphere and analyze how they respond to contemporary and future climate change.
Firstly, I develop a process-based biogeochemistry model embedded in Terrestrial Ecosystem Model (TEM) to quantify the CO exchange between soils and the atmosphere at the global scale (Chapter 2). Parameterizations were conducted by using the CO in situ data for eleven representative ecosystem types. The model is then extrapolated to global terrestrial ecosystems. Globally soils act as a sink of atmospheric CO. Areas near the equator, Eastern US, Europe and eastern Asia will be the largest sink regions due to their optimum soil moisture and high temperature. The annual global soil net flux of atmospheric CO is primarily controlled by air temperature, soil temperature, SOC and atmospheric CO concentrations, while its monthly variation is mainly determined by air temperature, precipitation, soil temperature and soil moisture.
Secondly, to better quantify the global CH4 emissions from wetlands and their uncertainties, I revise, parameterize and verify a process-based biogeochemical model for methane for various wetland ecosystems (Chapter 3). The model is then extrapolated to the global scale to quantify the uncertainty induced from four different types of uncertainty sources including parameterization, wetland type distribution, wetland area distribution and meteorological input. Spatially, the northeast US and Amazon are two hotspots of CH4 emissions, while consumption hotspots are in the eastern US and eastern China. The relationships between both wetland emissions and upland consumption and El Niño and La Niña events are analyzed. This study highlights the need for more in situ methane flux data, more accurate wetland type and area distribution information to better constrain the model uncertainty.
Thirdly, to further constrain the global wetland CH4 emissions, I develop a predictive model of CH4 emissions using an artificial neural network (ANN) approach and available field observations of CH4 fluxes (Chapter 4). Eleven explanatory variables including three transient climate variables (precipitation, air temperature and solar radiation) and eight static soil property variables are considered in developing the ANN models. The models are then extrapolated to the global scale to estimate monthly CH4 emissions from 1979 to 2099. Significant interannual and seasonal variations of wetland CH4 emissions exist in the past four decades, and the emissions in this period are most sensitive to variations in solar radiation and air temperature. This study reduced the uncertainty in global CH4 emissions from wetlands and called for better characterizing variations of wetland areas and water table position and more long-term observations of CH4 fluxes in tropical regions.
Finally, in order to study a new pathway of CH4 emissions from palm tree stem, I develop a two-dimensional diffusion model. The model is optimized using field data of methane emissions from palm tree stems (Chapter 5). The model is then extrapolated to Pastaza-Marañón foreland basin (PMFB) in Peru by using a process-based biogeochemical model. To our knowledge, this is among the first efforts to quantify regional CH4 emissions through this pathway. The estimates can be improved by considering the effects of changes in temperature, precipitation and radiation and using long-period continuous flux observations. Regional and global estimates of CH4 emissions through this pathway can be further constrained using more accurate palm swamp classification and spatial distribution data of palm trees at the global scale.
(9809528), Benjamin Kele. "On-site wastewater treatment and reuse using recirculatory evapotranspiration channels in regional Queensland." Thesis, 2005. https://figshare.com/articles/thesis/On-site_wastewater_treatment_and_reuse_using_recirculatory_evapotranspiration_channels_in_regional_Queensland/13423052.
Повний текст джерела(9729146), Kyle David Richardville. "Overcoming Barriers In Urban Agriculture To Promote Healthy Eating On College Campuses." Thesis, 2020.
Знайти повний текст джерела(6612953), Benjamin P. Wilkins. "Deciphering Soil Nitrogen Biogeochemical Processes Using Nitrogen and Oxygen Stable Isotopes." Thesis, 2019.
Знайти повний текст джерелаVariations in stable isotope abundances of nitrogen (δ15N) and oxygen (δ18O) of nitrate are a useful tool for determining sources of nitrate as well as understanding the transformations of nitrogen within soil (Chapter 2). Various sources of nitrate are known to display distinctive isotopic compositions, while nitrogen transformation processes fractionate both N and O isotopes and can reveal the reaction pathways of nitrogen compounds. However, to fully understand the δ15N and δ18O values of nitrate sources, we must understand the chemistry and the isotopic fractionations that occur during inorganic and biochemical reactions. Among all N cycle processes, nitrification and denitrification displayed some of the largest and most variable isotope enrichment factors, ranging from -35 to 0‰ for nitrification, and -40 to -5‰ for denitrification. In this dissertation, I will first characterize the isotopic enrichment factors of 15N during nitrification and denitrification in a Midwestern agricultural soil, two important microbial processes in the soil nitrogen cycle. Nitrification incubations found that a large enrichment factor of -25.5‰ occurs during nitrification NH4+ è NO3-, which agrees well with previous studies (Chapter 3). Additionally, oxygen isotopic exchange that occurs between nitrite and water during nitrification was also quantified and found that 82% of oxygen in NO3- are derived from H2O, much greater than the 66% predicted by the biochemical steps of nitrification. The isotopic enrichment that occurs during denitrification was assessed by measuring the change in δ15N as the reactant NO3- was reduced to N2 gas (Chapter 4). The incubations and kinetic models showed that denitrification can causes large isotopic enrichment in the δ15N of remaining NO3-. The enrichment factor for NO2- è gaseous N was -9.1‰, while the enrichment factors for NO3- è NO2- were between -17 to -10‰, both of which were within the range of values report in literature. The results demonstrated that nitrification and denitrification caused large isotope fractionation and can alter the presumed δ15N and δ18O values of nitrate sources, potentially leading to incorrect apportionment of nitrate sources.
The results of the denitrification incubation experiments were applied to a field study, where the measured enrichment factor was utilized to quantify loss of N by field-scale denitrification (Chapter 5). Field-based estimates of total denitrification have long been a challenge and only limited success has been found using N mass balance, N2O gas flux, or isotope labeling techniques. Here, the flux of nitrate and chloride from tile drain discharge from a small field was determined by measuring both dissolved ions (ion chromatography) and monitoring water discharge. The δ15N and δ18O of tile nitrate was also measured at a high temporal resolution. Fluxes of all N inputs, which included N wet and dry deposition, fertilizer application, and soil mineralization were determined. The d15N and d18O values of these nitrate sources was also determined. Using this data, I first detected shifts in δ15N and δ18O values in the tile drain nitrate, which indicated variable amounts of denitrification. Next, a Rayleigh distillation model was used to determine the fraction of NO3- loss by field scale denitrification. This natural abundance isotope method was able to account for the spatial and temporal variability of denitrification by integrating it across the field scale. Overall, I found only 3.3% of applied N was denitrified. Furthermore, this study emphasized the importance of complementary information (e.g. soil moisture, soil temperature, precipitation, isotopic composition of H2O, etc.), and the evidence it can provide to nitrogen inputs and processes within the soil.
(9797765), Sheeana Gangadoo. "Exploring the potential to improve the gut microbiome of broiler chickens using selenium nanoparticle supplements." Thesis, 2020. https://figshare.com/articles/thesis/Exploring_the_potential_to_improve_the_gut_microbiome_of_broiler_chickens_using_selenium_nanoparticle_supplements/13410473.
Повний текст джерела(9788021), Colin Cole. "Fluidized bed combustion of waste material." Thesis, 1994. https://figshare.com/articles/thesis/Fluidized_bed_combustion_of_waste_material/13459283.
Повний текст джерела(9850352), E. Grigg. "A critical discourse analysis of literature pertaining to the historical "management" of the sexual and/or intimacy needs of people labelled as having a learning disability in Australia and the United Kingdom." Thesis, 2014. https://figshare.com/articles/thesis/A_critical_discourse_analysis_of_literature_pertaining_to_the_historical_management_of_the_sexual_and_or_intimacy_needs_of_people_labelled_as_having_a_learning_disability_in_Australia_and_the_United_Kingdom/13387214.
Повний текст джерела(9789053), Lynette Costigan. "An ordinary man, an extraordinary life: Eric Zillman, naturalist." Thesis, 1993. https://figshare.com/articles/thesis/An_ordinary_man_an_extraordinary_life_Eric_Zillman_naturalist/13464272.
Повний текст джерела(9873653), P. Bojcic. "Flow of molasses through pipe fittings at low Reynolds number." Thesis, 1996. https://figshare.com/articles/thesis/Flow_of_molasses_through_pipe_fittings_at_low_Reynolds_number/13421192.
Повний текст джерелаPietrzykowski, E. "New Tools for Determining Incidence and Severity of Mycosphaerella Leaf Disease in Eucalypt Plantations." 2007. http://eprints.utas.edu.au/5802.
Повний текст джерела(9786986), Sze San Chong. "Adaptive sliding mode control for robotic manipulators by hybridisation." Thesis, 1997. https://figshare.com/articles/thesis/Adaptive_sliding_mode_control_for_robotic_manipulators_by_hybridisation/19326698.
Повний текст джерела(7552283), L. Liu. "New syntheses of protoberberines: Cycloaddition and carbanionic methodology leading to the production of highly enantioselective products." Thesis, 1997. https://figshare.com/articles/thesis/New_syntheses_of_Protoberberines_Cycloaddition_and_carbanionic_methodology_leading_to_the_production_of_highly_enantioselective_products/13425983.
Повний текст джерела(5931173), Jessica Merkling. "Development of an Environmental DNA Assay for Eastern Massasauga." Thesis, 2019.
Знайти повний текст джерела