نتایج جستجو برای: otoacustic emissions
تعداد نتایج: 65527 فیلتر نتایج به سال:
Beef cattle feedlots are estimated to contribute 26% of U.S. agricultural greenhouse gas (GHG) emissions, and future climate change policy could target reducing these emissions. Life cycle assessment (LCA) of GHG emissions from U.S. grain-fed beef cattle was conducted based on industry statistics and previous studies to identify the main sources of uncertainty in these estimations. Uncertainty ...
In addition to air pollution emissions, the transportation sector in the US is responsible for more than 25% of greenhouse gas emissions. Due to the negative impacts of these emissions, primarily on health and the environment, literature of vehicle emissions models is rich. Yet, attempts to synthesize and contrast models of this rich literature are scarce. Contrasting models of gasoline and ele...
Arctic terrestrial ecosystems are major global sources of methane (CH4); hence, it is important to understand the seasonal and climatic controls on CH4 emissions from these systems. Here, we report year-round CH4 emissions from Alaskan Arctic tundra eddy flux sites and regional fluxes derived from aircraft data. We find that emissions during the cold season (September to May) account for ≥ 50% ...
High concentrations of ozone in the Houston/Galveston area are associated with industrial plumes of highly reactive hydrocarbons mixed with NOx. The emissions leading to these plumes can have significant temporal variability, and photochemical modeling indicates that the emissions variability can lead to increases and decreases of 10–50 ppb, or more, in ozone concentrations. Therefore, in regio...
BACKGROUND Livestock play an important role in carbon cycling through consumption of biomass and emissions of methane. Recent research suggests that existing bottom-up inventories of livestock methane emissions in the US, such as those made using 2006 IPCC Tier 1 livestock emissions factors, are too low. This may be due to outdated information used to develop these emissions factors. In this st...
26 This paper presents a multidisciplinary , bottom-up approach for estimation and analysis of 27 the direct carbon emissions, and the organic carbon (OC) stored in gardens, using a sample 28 of 575 households across a UK city. The direct carbon emissions were those from domestic 29 end-use energy demand by each household: gas, electricity and personal transport. The 30 stored OC was the carbon...
Biogenic sources contribute a large portion of emissions of volatile organic compounds (VOCs), a precursor to tropospheric ozone (O3). These emissions are difficult to control and are affected by land-use and climate. A sensitivity analysis was performed using an emissions scenario with a 100% increase in biogenic emissions and another scenario with an additional 100% increase in motor vehicle ...
HOW TO CITE: Nickless A, Scholes RJ, Filby E. Spatial and temporal disaggregation of anthropogenic CO2 emissions from the City of Cape Town. S Afr J Sci. 2015;111(11/12), Art. #2014-0387, 8 pages. http://dx.doi.org/10.17159/ sajs.2015/20140387 This paper describes the methodology used to spatially and temporally disaggregate carbon dioxide emission estimates for the City of Cape Town, to be use...
According to the IPCC guidelines, CO2 emissions from biomass should be excluded from the entire amount of CO2 emissions when calculating CO2 emissions and should be separately reported due to the “carbon neutrality.” Sewage sludge is one of the representative biomass fuels. And it is mixed with fossil fuels in terms of greenhouse gas reduction or is used as fuel to replace fossil fuels by itsel...
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