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13 results for "nitrogen"
HETEROGENEITY IN THE URBAN LANDSCAPE: IMPACTS ON HYDROLOGIC PROCESSES AND NITROGEN POLLUTION By Monica Lipscomb Smith
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This research evaluated the usefulness of the commonly used National Land Cover Database for deriving urban hydrologic parameters, defined metrics linking suburban landscape structure and nitrogen... More > fluxes, and determined variance of hydrologic properties of residential lawns according to social and physical factors. Results suggested that the NLCD is insufficient for urban hydrologic studies due to biases and variability of these datasets. Nitrate concentrations of suburban streams were best characterized by watershed infrastructure. Septic-managed watersheds’ stream nitrate correlated with population density, septic location, and presence of wetlands. Reduced saturated infiltration rates in residential lawns caused only marginal differences in overland flow when compared to regional rain records. Of the factors assessed in this dissertation, waste management infrastructure was defined as the most critical feature explaining nitrate dynamics in the urban landscape.< Less
HETEROGENEITY IN THE URBAN LANDSCAPE: IMPACTS ON HYDROLOGIC PROCESSES AND NITROGEN POLLUTION By Monica Lipscomb Smith
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This research evaluated the usefulness of the commonly used National Land Cover Database for deriving urban hydrologic parameters, defined metrics linking suburban landscape structure and nitrogen... More > fluxes, and determined variance of hydrologic properties of residential lawns according to social and physical factors. Results suggested that the NLCD is insufficient for urban hydrologic studies due to biases and variability of these datasets. Nitrate concentrations of suburban streams were best characterized by watershed infrastructure. Septic-managed watersheds’ stream nitrate correlated with population density, septic location, and presence of wetlands. Reduced saturated infiltration rates in residential lawns caused only marginal differences in overland flow when compared to regional rain records. Of the factors assessed in this dissertation, waste management infrastructure was defined as the most critical feature explaining nitrate dynamics in the urban landscape.< Less
The Growth Effect of Toluene and Benzene on Nitrogen Fixing Bacteria Rhizobium leguminosarum in vitro and in vivo Studies on Seeds of Phaseolus vulgaris. By Andres Botero
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R. leguminosarum is a nitrogen fixing bacteria that can contribute to the decontamination of areas with high levels of Toluene and Benzene.
The Growth Effect of Toluene and Benzene on Nitrogen Fixing Bacteria Rhizobium leguminosarum in vitro and in vivo Studies on Seeds of Phaseolus vulgaris. By Andres Botero
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R. leguminosarum is a nitrogen fixing bacteria that can contribute to the decontamination of areas with high levels of Toluene and Benzene.
Freshwater Aquarium Chemistry By Kevin Ruff
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This book is a comprehensive guide to every aspect of freshwater aquarium chemistry. The first chapter deals with the basics of water. Why is water a liquid? What dissolves in water & why?... More > Later chapters delve into pH, hardness, and the nitrogen cycle (ammonia, nitrite, & nitrate). Every chapter explains what each water condition is, how testing for them works, how to know when something is wrong, and (maybe most importantly) what to do to fix it. The last chapter deals with aquarium setup and maintenance -- putting everything together from the previous chapters into a "how to" guide to setting up a new aquarium. The chemsitry throughout the book is described in a simple manner. Both novice & expert aquarists will benefit from the in-depth information presented herein.< Less
The Farm That Won’t Wear Out By Cyril G. Hopkins
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A classic text on the whys and hows of sustainable farming. Still very relevant today. Includes: WHAT GOES TO MAKE UP PERMANENT FERTILITY ; THE NITROGEN PROBLEM AND ITS ECONOMICAL SOLUTION ;... More > PHOSPHORUS: THE MASTER KEY TO PERMANENT AGRICULTURE ; PERMANENT SOIL FERTILITY< Less
HCCI Engine Control and Optimization By Nick Killingsworth
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Homogeneous charge compression ignition (HCCI) engines have the benefit of high efficiency with low emissions of nitrogen oxides and particulates. These benefits are due to the autoignition process... More > of the dilute mixture of fuel and air during compression. However, because there is no direct ignition trigger, control of ignition is inherently more difficult than in standard internal combustion engines. This dissertation addresses some the control issues of HCCI engines.< Less
HCCI Engine Control and Optimization By Nick Killingsworth
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Homogeneous charge compression ignition (HCCI) engines have the benefit of high efficiency with low emissions of nitrogen oxides and particulates. These benefits are due to the autoignition process... More > of the dilute mixture of fuel and air during compression. However, because there is no direct ignition trigger, control of ignition is inherently more difficult than in standard internal combustion engines. This dissertation addresses some the control issues of HCCI engines.< Less
HCCI Engine Control and Optimization By Nick Killingsworth
eBook (PDF): $0.00
Download immediately.
Homogeneous charge compression ignition (HCCI) engines have the benefit of high efficiency with low emissions of nitrogen oxides and particulates. These benefits are due to the autoignition process... More > of the dilute mixture of fuel and air during compression. However, because there is no direct ignition trigger, control of ignition is inherently more difficult than in standard internal combustion engines. This dissertation addresses some the control issues of HCCI engines.< Less
Online Learning of a Neural Fuel Control System for Gaseous Fueled SI Engines By Travis Wiens
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This PhD dissertation presents a new type of fuel control algorithm for gaseous fuelled vehicles. Gaseous fuels such as hydrogen and natural gas have been shown to be less polluting than liquid... More > fuels, both at the tailpipe and on a total cycle. Unfortunately, it can be expensive to convert vehicles to gaseous fuels. One of major development costs for a new vehicle is the development and calibration of the fuel controller. The research presented here includes a fuel controller which does not require an expensive calibration phase. The controller is based upon a two-part model, using online training of a neural network to model the engine’s steady state characteristics. An experimental test was performed, in which the controller was installed on a truck fuelled by natural gas. The tailpipe emissions of the truck with the new controller showed better results than the OEM controller on both carbon monoxide and nitrogen oxides, and required no calibration and very little information about the engine.< Less

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