3,644 research outputs found
A non-commutative Julia Inequality
We prove a Julia inequality for bounded non-commutative functions on
polynomial polyhedra. We use this to deduce a Julia inequality for holomorphic
functions on classical domains in . We look at differentiability
at a boundary point for functions that have a certain regularity there
Meteoric \u3csup\u3e10\u3c/sup\u3eBe, Fe\u3csub\u3ed\u3c/sub\u3e, and Clay in Critical Zone Soils, Front Range, Colorado
The critical zone is the zone within which meteoric water, atmospheric gases, soil, and bedrock interact, encompassing the zone of soil formation (Anderson et al., 2007). The concentrations of various pedogenic compounds at a given location indicate the degree of weathering that has taken place in the Critical Zone. Among the products of chemical weathering are secondary phyllosilicate minerals (clays) and iron (Birkeland, 1999). At stable sites, chronosequence studies have shown that the amount of pedogenic iron oxide and clay increase as soils become older (McFadden and Hendricks, 1985).
Meteoric ¹⁰Be is a cosmogenic nuclide produced from oxygen and nitrogen in the atmosphere. It reaches the surface in rain water and dust and then binds to soil particles. As a soil profile evolves, so does its meteoric ¹⁰Be inventory due to soil formation and mixing processes. Given a steady state hillslope, the peak concentration of meteoric ¹⁰Be is expected in one horizon (Jungers et al., 2009). Concentration then decreases with depth, and the inventory is expected to increase downslope, creating a profile with a bulge. Given a young and eroding hillslope profile, the highest concentration of meteoric ¹⁰Be will still be in a single layer but erosion prevents this concentration from moving to depths beyond near-surface (Graly et al., 2010). The geochemistry of soils provides useful insight into soil character and development, and when applied to steep, active hillslopes, aids in the analysis of evolving topography. The addition of meteoric ¹⁰Be to soil analysis, combined with well-constrained delivery rates, allows for the dating of evolving soils and calculation of downslope soil transport.
This study examined hillslopes in Gordon Gulch, a 2.75 km² catchment with locally exposed bedrock and one of three focus areas of the Boulder Creek Critical Zone Observatory. Gordon Gulch is located downslope and to the east of the modern alpine environment and late Pleistocene glacial limit and generally upslope and to the west of the deeply incised landscape that characterizes the lower portion of Front Range rivers. Gordon Gulch may be affected by both upstream-migrating rejuvenation from the lower portion of the range and/or alpine environmental processes (i.e. periglacial activity)
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Revising the National Ambient Air Quality Standard for Lead
This report provides background on the National Ambient Air Quality Standard (NAAQS), the process used to establish the standards, the factors leading to the reduction in lead emissions, and the proposed changes to the lead standard, as well as information regarding the potential effects of any revision
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EPA Standards for Greenhouse Gas Emissions from Power Plants: Many Questions, Some Answers
This report discusses the Environmental Protection Agency (EPA), and the New Source Performance Standards (NSPS) proposals for electric generating units (EGU) Greenhouse Gas Emissions
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108th Congress
Clean air issues were discussed at length in the 107th Congress, but legislation was not enacted, leaving the same issues for possible consideration in the 108th. The most prominent air quality issues discussed in this report are; the controversy over EPA’s proposed changes to the New Source Review (NSR) requirements, Clear Skies / Multi-Pollutant Legislation, gasoline additive MTBE, Conformity of Transportation Plans and SIPs Deadlines for Achieving the Ozone Air Quality Standard
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109th Congress
The courts and the executive branch face major decisions on clean air issues in 2006, with Congress more likely playing an oversight role. One focus is EPA's Jan. 17 2006 proposal to strengthen air quality standards for fine particles, which are estimated to cause tens of thousands of premature deaths annually. Whether the proposal is supported by the available science and what impact its implementation would have likely issues of concern. Other issues of continuing interest are EPA's 2005 decisions limiting interstate transport of air pollution and establishing cap-and-trade systems for emissions from coal-fired power plants, and the agency's proposed changes to New Source Review
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Ozone Air Quality Standards: EPA's 2007 Proposed Changes
This report provides background on the National Ambient Air Quality Standard (NAAQS), the process used to establish them, the existing ozone standard, and EPA's proposal, as well as information regarding the potential effects of any revision to the standard
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Snowmobiles: Environmental Standards and Access to National Parks
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Recycling Computers and Electronic Equipment: Legislative and Regulatory Approaches for "E-Waste"
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114th Congress
This report discusses regulatory actions that have recently received attention in the 114th Congress including EPA's proposed regulations on the emissions of greenhouse gases (GHGs) from power plants, and a proposed revision of the ambient air quality standard for ozone
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