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 62 for “"DECOMPOSITION RATE"”.
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Effect of catalyst groove width on decomposition rate of hydrogen peroxide
Thesis (B.S.) Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1947.
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Coarse Woody Debris in Industrially Managed Pinus taeda Plantations of the Southeastern United States
… climatic and ecological factors that affect the decomposition rate of CWD, to predict the decomposition rate, specific gravity, and time since death (TSD) using multiple linear regression in industrial loblolly pine (Pinus taeda L.) plantations in the southeastern United States. The study sites …
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Transport and decomposition of allochthonous litter in Icelandic headwater streams: Effects of forest cover
… of litter transport into streams and litter decomposition within them. This was the first study made in Iceland on the terrestrial-aquatic interactions in forested ecosystems. The main study consisted of nine run-off fed headwater streams in Fljótsdalshérað in eastern Iceland (N 65°01’–N …
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Modelling the floating-catalyst method for carbon nanotube production
… process is then investigated by calculating the decomposition rate of thiophene from experimental observations. The problem of finding the decomposition rate is set up using a Bayesian inference framework and the resulting objective function is minimised using a gradient-based method. An adjoint …
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Separation and Characterization of Unknown Halogenated Disinfection by -Products in Drinking Water
… structure-activity relationships, the decomposition rate constants of six iodinated trihaloacetic acids were estimated. It is quite likely that dichloroiodoacetic acid and bromochloroiodoacetic acid may be found in some drinking waters.
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Decomposition and Nitrogen Release From Leucaena leucocephala,senna siamea, and Flemingia macrophylla Litter in managed alleys for maize in Zambia:Infuence of inorganic-N and litter Quality
… of litter quality and inorganic nitrogen (N) on rate of decomposition and N release pattern by three leguminous woody species were investigated under field conditions by the litterbag technique. The species studied in 1994/1995 were Leucaena leucocephala, Senna siamea and Flemingia macrophylla. …
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Decomposition and Nitrogen Release From Leucaena leucocephala,senna siamea, and Flemingia macrophylla Litter in managed alleys for maize in Zambia:Infuence of inorganic-N and litter Quality
… of litter quality and inorganic nitrogen (N) on rate of decomposition and N release pattern by three leguminous woody species were investigated under field conditions by the litterbag technique. The species studied in 1994/1995 were Leucaena leucocephala, Senna siamea and Flemingia macrophylla. …
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Modeling the effects of forest management on the carbon cycle in a loblolly pine (Pinus taeda) plantation
… regulated or un-regulated. Model sensitivity to decomposition rate, discount rate and timber prices is assessed to determine the effects of uncertainty (measurement error and future trends) on the results of the model. Short rotations are most sensitive to decomposition assumptions and stumpage …
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Effects of Western Spruce Budworm Herbivory on Forest Soils and Litter Decomposition in Central Washington
… Cascades and their herbivory could increase the decomposition rate of forest materials by adding essential nutrients and/or by increasing light and rainfall penetration to the forest floor by thinning the forest canopy during outbreaks. Budworm defoliation events are expected to increase in …
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Effects of plant invasions on ecosystem processes: Linking above- and below-ground resource-use strategies of native and invasive species in Eastern U.S. forests
… different above- and below-ground resource-use strategies that can profoundly alter ecosystem processes. Here I investigated above- and below-ground plant traits and soil properties associated with resource-use strategies and soil nitrogen (N) dynamics for multiple native and non-native forest …
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The effect of clothing on decomposition and scavenging in two forensically significant habitats in Cape Town, South Africa
… an ongoing challenge given the high murder rate in the country. A crucial aspect of the forensic death investigation involves estimating the postmortem interval, which is influenced by biogeographic factors specific to the region. To ensure the collection of forensically relevant data, the …
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Heterogeneous Photooxidation of Trichloroethene on Titanium Oxides Encapsulated in Zeolites L and Y
… pores was studied using Transmission FT-IR. The decomposition was performed by utlizing two distinctly different pore structures. These were the interconnected supercages of zeolite Y and the parallel channeled system of zeolite L. The observed products and intermediates showed similarities to …
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Soil Carbon and Nutrient Cycling Across Cover Types in Southern Appalachian Hardwood Forests
… not differ among the cover types, and (3) litter decomposition would not differ among the diverse cover types. In 0.02 ha plots, replicated four times, Rs and associated variables (e.g., soil temperature and moisture) were measured. Measurements occurred in three sub-sample locations per plot, …
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Belowground impacts of regenerative agriculture in a South African seed production system
… to understand the impact of various management strategies on various aspects of agroecosystems to gain a greater, more holistic understanding. A newly established long-term trial provided an ideal opportunity to explore and compare the impacts of regenerative agriculture with conventional …
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Exploration and Development of Electrically Controllable Gel and Solid Propellants
… do not have the capability to modify the burning rate on demand during operation, which greatly limits operational capabilities. The research outlined in this dissertation explores the fundamentals in the creation of ECPs to enable increased control in the burning rate of solid rockets. The …
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Evaluation of Ecological Function of Urban Riparian and Stream Systems: Guiding Ecological Restoration in Austin, Texas, USA
… of a group of urban streams, leaf-litter decomposition was used as an integrated metric for assessing anthropogenic impacts. I measured leaf-litter decomposition rate with two species, Texas Red Oak (Quercus texana) and American Sycamore (Platanus occidentalis), as a response variable …
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Cover Cropping: A Strategy to Healthy Soil and Nitrogen Management in Corn
… carbon (POXC), CO2 burst, autoclaved-citrate extractable (ACE)-soil protein, b) investigate the relationship between soil health indicators, soil nitrate (NO3-N) and ammonium (NH4-N), corn N requirement and corn yield, and c) study the decomposition and N release of different cover crops. …
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Lignin and carbon transformation in roots of maize and mixed perennial biofuel crops
… to assess the impact of residue quality on root decomposition rate.</p> <p>The acetyl bromide method was used to determine the total soluble lignin, and the alkaline CuO oxidation method was used to characterize lignin quality by the abundance of vanillyl, syringyl, and cinnamyl monomers. …
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Effects of soil temperature on Sphagnum moss litter quality and decomposition in a subarctic environment
… soil carbon budgets, attributed to the slow decomposition rate of Sphagnum mosses that facilitates carbon sequestration through the build-up of peat. As climate change is predicted to increase soil temperatures and decomposition rates of organic matter, studying environmental and …
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Drift modelling of marine mammal carcases in coastal waters
… and backwards in time to provide insights into strategies for environmental monitoring under two scenarios. The first explored the beach search options for carcases resulting from potentially fatal collisions between tidal-stream turbines and marine mammals. The second applied the reverse problem …
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