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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 47 for “"ammonia (NH3)"”.
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Laboratory Measurements of the Millimeter Wavelength Opacity of Phosphine (PH3) and Ammonia (NH3) Under Simulated Conditions for the Cassini-Saturn Encounter
… of the outer planets; however phosphine and ammonia are the main microwave absorbers at Saturn at pressures less than two bars. Understanding the pressure induced absorption of both constituents at observational frequencies is therefore vital to the analysis of any observational data. …
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The effect of endurance training on human ammonia metabolism
This thesis examines human ammonia (NH3) metabolism in trained and untrained individuals. Specifically, these aspects include: 1) plasma NH3 accumulation during exercise at similar absolute and relative work intensities; 2) plasma NH3 accumulation during recovery from maximal exercise; 3) the …
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Methane Emissions and Ammonia Volatilization from Drill-Seeded, Delayed-Flood Rice on a Silt-Loam Soil in Arkansas
… the common N source, urea, is prone to loss via ammonia (NH3) volatilization. Thus, the objective of this research was to investigate trace gas emissions from rice on a silt-loam soil, including CH4 emissions as influenced by nitrogen (N) fertilization (i.e., optimal N and no N) in 2011, and …
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Assessing the Effects of Temperature, Feeding Status, and the Microbiome on the Maximal Activities of Several Enzymes Important to Energy Production and Ammonia Detoxification in the Intestines of Teleost Fish
… enzymes important to energy production and ammonia (NH3) detoxification in the intestines of three species of teleosts: the goldfish, rainbow darter and central stoneroller. In warm-acclimated goldfish, intestinal and branchial tissues were more responsive to feeding, while renal tissues …
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Lipid Productivity of Algae Grown on Dairy Wastewater as a Possible Feedstock for Biodiesel
… 12 days of incubation was nearly complete. Total ammonia (NH3+NH4+) was reduced 96% to 1.1 mg/L as N, and phosphate (PO4^3-) was reduced >99% from an initial concentration of 2.5 mg/L PO4 as P.
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Multiple Velocity Component Analysis of Ammonia Spectral Lines in High-Mass Star-Forming Regions
… We perform a multiple component analysis of ammonia (NH3) gas observations from a Green Bank Telescope large program covering 11 giant molecular clouds (GMCs). To this end we extended existing codes to enable simultaneous fitting of up to three velocity components with radiative transfer. …
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Nitrous oxide and methane emissions from agriculture and approaches to mitigate greenhouse gas emissions from livestock production
… Manure application techniques to abate ammonia (NH3) emissions do not axiomatically increase emissions of N2O and may decrease them. Soil temperature measurements from 1976 to 2010 were consistent with the warming trends reported over the last 40 years.
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Olahan air sisa pusat penyembelihan ayam menggunakan elektrod keluli tahan karat dan aluminum melalui proses gabungan elektro-penggumpalan dan pengelompokan dan penggumpalan dengan menggunakan aluminum sulfat dan poli-aluminum klorida
… kimia (COD), pepejal terampai (SS), nitrogen ammonia (NH3-N), kekeruhan dan warna. Penentuan saiz flok sebelum dan selepas olahan juga ditentukan. Berdasarkan keputusan kajian, susunan elektrod Al+-Al- memberikan peratusan penyingkiran terbaik berbanding susunan lain. Nilai optimum ketumpatan …
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The Heme-Lysine Cross-Link of Cytochrome P460: Effects on Catalysis and Mechanism of Formation
Nitrification is the process in which ammonia (NH3) is ultimately converted to nitrate (NO3-) by ammonia-oxidizing microorganisms. In NH3-oxidizing bacteria (AOB), anammox bacteria, and comammox bacteria the enzyme hydroxylamine oxidoreductase (HAO) is able to convert hydroxylamine (NH2OH) to …
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The impact of metals and other stress factors on microbial ammonia oxidation physiology and isotope effects
… quality, ecosystem health, and climate change. Ammonia (NH3) oxidation, the first and rate-limiting step of nitrification, is carried out by bacteria (AOB) and archaea (AOA). Despite more than a century of research into the physiology of AOB, and only more recently AOA, fundamental questions …
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The effects of ozone treatment on chemical parameters of a recirculating aquaculture system producing hybrid striped bass
… which favored the ionized (less toxic) form of ammonia. Enhanced biodegradation of organics in the ozonated systems may have increased carbon dioxide production and caused a decline in pH. Greater nitrification in the ozonated systems may have also decreased the pH. Higher total ammonia nitrogen …
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Systematic evaluation of laying hen exposure to atmospheric ammonia
Maintaining low atmospheric ammonia (NH3) concentrations in laying hen housing is a well-known challenge and recently has become the center of legislation for animal housing. In the winter months, poultry farm managers have to balance indoor temperature and environment (including atmospheric …
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Performance and Emissions Study of N+3 and N+4 Engine Models with Several Fuel types Using NPSS
… hydrogen (LH2), liquefied natural gas (LNG), ammonia (NH3), and ammonia-borane (AB) are explored as alternative fuel sources alternative to conventional Jet-A fuel. The engine size is fixed using published reference data from NASA and a fixed core engine model is developed and validated …
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Instrument Trade Studies for Satellite Remote Sensing of Ammonia
Atmospheric ammonia (NH3) has effects on air quality and water quality, but due to its short lifetime and high spatial variablility, obtaining global measurements is a challenge. Advances in radiative transfer modelling and radiometric instrument sensitivity have allowed for satellite NH3 …
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Integrated Modeling of Agricultural Reactive Nitrogen in the United States: Emissions, Impacts, and Mitigation Strategies
… nitric oxide (NO), nitrous acid (HONO), and ammonia (NH3), that damage air quality, climate, and human health. As air pollutants, NO and NH3 contribute to the formation of ozone (O3) and particulate matter (PM), with impacts that depend on spatiotemporally variable atmospheric conditions. …
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An analysis of nature-based treatment processes for cleaning contaminated surface water runoff from an informal settlement: a case study of the Stiebeuel River catchment, Franschhoek, South Africa
… conditions. Both cells effectively reduced ammonia (NH3), Total Phosphate (TP) and Escherichia coli (E. coli) concentrations, but leached nitrate (NO3 - ) and nitrite (NO2 - ). The treated waters were suitable for irrigational reuse, however, additional disinfection was required to reduce …
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Air pollution and early deaths in the United States : attribution of PM₂.₅ exposure to emissions species, time, location and sector
… .5 exposure is due to NO, emissions and 33% from ammonia (NH3), which is a result of emissions after-treatment technologies. We estimate that the benefit of reducing NH3 emissions from road transportation is ~20 times that of NOx per unit mass. 75% of the road transportation ammonia impacts occur …
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Use of Stable Isotopes to Trace the Fate of Applied Nitrogen in Forest Plantations to Evaluate Fertilizer Efficiency and Ecosystem Impacts
… fertilizers (EEFs) significantly reduced ammonia (NH3) volatilization losses compared to urea. Mean NH3 volatilization after spring fertilization ranged from 4% to 26% for EEFs versus 26% to 40% for urea, and 8% to 23% for EEFs versus 29% to 49% for urea in summer. Chapter 3 results showed …
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Advanced control techniques and sensors for gas engines with NSCR
… conditions, the NSCR catalyst system produces Ammonia (NH3). NOx sensors have a cross sensitivity to NH3 and will respond as though it has been exposed to NOx. This behavior provides a unique control strategy that allows lambda sensor calibration to be ignored. Testing was performed on a …
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A multi-technique approach to characterise acidic surface properties of microporous catalysts
… probe molecules other than pyridine, that is, ammonia (NH3) as well as zeolite framework types other than ZSM-5, that is, chabazite (CHA).
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