The best magazine
环境科学 & 安全科学 : 学术学位
Source apportionment of mercury to the atmosphere from wildfires and other sources in the western USA.
Mercury (Hg) is a toxic trace metal with globally distributed emissions, and the potential to bioaccumulate in terrestrial and aquatic animals. This dissertation characterizes source apportionment of Hg to the atmosphere with the goal of better understanding the global Hg cycle in order to mitigate
The objectives of my dissertation were to determine: (1) the current carbon accumulation rates in Rocky Mountain National Park pristine fens, (2) whether the Grand Ditch water diversion in Rocky Mountain National Park decreased carbon accumulation in fens, (3) how much the water table
Design of capping for contaminated sludges typically involves use of a geotextile and requires evaluation of filtration performance. The objective of this study was to investigate the filtration performance of wastewater sludge with a variety of geotextiles and develop geotextile filter criteria bas
This paper investigates the case of a polluting firm with market power in both its product and factor markets. The model reveals that a combination of tax and offsetting subsidy implemented by the regulator would alleviate two of the three externalities present. Once the equilibrium outcome is estab
An evaluation of the impact of spoil handling methods on the physical properties of a replaced growing medium and on tree survival.
Excessive compaction in replaced soil can hinder establishment of trees on reclaimed surface mines. Compaction results primarily from excessive grading and/or excessive equipment traffic during soil handling (i.e. removal, stockpiling, transporting, placing, and grading). Mechanical resistance to pe
Modeling the per capita ecological footprint for Dallas County, Texas: Examining demographic, environmental value, land-use, and spatial influences.
This study addresses factors driving the variation in the per capita Ecological Footprint (EF) in Dallas County, Texas. A main hypothesis was that scientifically estimated demography, environmental values, spatial attributes, and land-use patterns surrounding an individual are significant factors in
Approaches to assessing microbial communities in soil, two examples: Biosurfactant production and phenanthrene degradation.
This dissertation is concerned with studying aspects of the ecology of microorganisms from a functional perspective using different microbial populations in soils. In the first study, an investigation was done on the distribution of biosurfactant producing microorganisms. In the second study, tempor
A study of geographical characterization of ship traffic and emissions and cost-effectiveness of reducing sulfur emissions from foreign waterborne commerce for the United States west coast.
This dissertation enhances existing methods and develops the Waterway Network Ship Traffic and Air Emissions Model (WWN-STAEM) to improve the accuracy of spatially resolved emissions inventories. Global empirical ship traffic networks were built based on historical ship locations. Sulfur emissions f
Diffuse phosphorus loss from agricultural land represents a major source of pollution to water bodies in the United States. Soil P saturation relates the capacity of a soil to bind soluble P to the quantity of P already held by the soil, and is a key environmental indicator of non-point source pollu
The evolution of the profile paradigm in the history of pedology and quaternary geology: Concepts and applications.
The soil profile concept in pedology and the weathering profile in Quaternary geology are essentially the same, but have been treated in ways to cause interdisciplinary conflict and confusion. The purpose of this study was (1) to research the history of the conflict and confusion through elucid
Industrial development in the Border region of Mexico and Texas depends on the availability and quality of water; several industries require high quality process water. Reverse osmosis systems achieve that quality, but high concentrations of silica in the local water supplies limit the recovery. Sil
Design and application of a multichannel laser-induced fluorescence system for environmental monitoring.
Laser induced fluorescence (LIF) spectroscopy is an analytical technique that provides superior sensitivity. It has been widely used in applications encompassing chemical, biological, physical, environmental, and pharmaceutical research. Combined with the use of cone penetrometer testing (CPT) techn
Reactions of soil arsenic with arsenic addition and the effects of soil arsenic on canola were studied because of a lack of information on this subject. The reactions of different pools of soil arsenic to arsenic addition were studied. The effects of soil arsenic and arsenic form and concentration i
Effects of early exposure to environmental tobacco smoke on the systemic and pulmonary immune system in infant monkeys.
Background. Environmental tobacco smoke (ETS) is a common indoor air pollutant. Epidemiological studies have shown that children's exposure to ETS during fetal development and early postnatal life is associated with an increased incidence of allergic and infectious diseases among children. It has be
Field and laboratory investigation was carried out to determine the controls on acid generation associated with sulphur (S) oxidation in a Northern Ontario mine tailings lake (Moose Lake). Field results showed major seasonal pH drops occurred, resulting from substantial acid generation in the lower
A new intentional tracer technique, suitable for tracing particulate matter emitted from high temperature combustion sources, was developed in this study. The technique uses stable enriched rare earth isotopes as intentional tracers of particulate matter and was applied to emissions from a coal-fire
Southern California is extremely rich in biological diversity but also subject to intense urban development pressures. These factors can create conflicts between the interests of conservationists, government regulators, and developers, particularly in such rapidly urbanizing regions. In this researc
This dissertation investigates the sediment fluxes observed in a partially stratified estuary. In an experiment spanning from neap to spring tides, vertical profiles of velocity, salinity and suspended sediment were collected within a channel in northern San Francisco Bay.; During weaker neap tides,
Cancer is the leading cause of death among Alaska Native women and the third leading cause of death among Alaska Native men. Speculation abounds as to why people living in some of the most remote regions of the United States are crippled with cancer, and, without a doubt, these theories are emotiona
Economic evaluation of air pollution reduction of phase I power plants in West Virginia: An output distance function approach.
Air pollutants from coal-fired power plants are nonmarket environmental bads. Title IV of the 1990 Clean Air Act Amendments (CAAA) sets the stage for the dirtiest power plants to reduce emissions of SO2 and NO x in two phases. Title IV allocates plants SO2 allowances as a variation of "pollution rig