نتایج جستجو برای: vehicle emission
تعداد نتایج: 290708 فیلتر نتایج به سال:
In-use, fuel-based motor vehicle emission factors were determined using measurements made in a highway tunnel in Pittsburgh, Pennsylvania. Concentrations of PM2.5 mass, CO, CO2, and NOx were measured continuously. Filter-based measurements included PM2.5 mass, organic and elemental carbon (OC and EC), inorganic ions and metals. Fuel-based emission factors for each pollutant were calculated usin...
word count: 230 TRB 2006 Annual Meeting CD-ROM Paper revised from original submittal. Barth/Collins/Scora/Davis/Norbeck 2 ABSTRACT In recent years, automobile manufacturers have been producing gasoline-powered vehicles that have very low tailpipe and evaporative emissions in order to meet very stringent certification standards set by the U.S. Environmental Protection Agency and the California A...
Figure 4-7 Time series of surface diameter (Ds), surface concentration (EAD signal and total particle concentration (DMS count) for a) DPX; b) Baseline-UDDS run.. Figure 5-3 (a) Emission factors of PAHs, hopanes and steranes of baseline and control device-equipped vehicles in UDDS cycle. (b) Emission factors of n-alkanes and acids of baseline and control device-Figure 5-4 (a) Emission factors o...
Three dimensional simulations are carried out to estimate the effect of wind direction, wind speed and geometry on the flow and dispersion of vehicular pollutant in a street canyon. The pollutant sources are motor vehicles passing between the two buildings. Suitable emission factors for petrol and diesel vehicles at varying vehicle speed are used for the estimation of the rate of emission from ...
is one of ten regional units mandated by Congress and estabIished in Fall 1988 to support research, education, and training in surface transportation. The UC Center serves federal Region IX and is supported by matching grants from the l_J. Los Angeles campuses. Faculty and students on other University of California campuses may participate in Center activities. Researchers at other universities...
Moving towards Sustainability: Road Grades and On-Road Emissions of Heavy-Duty Vehicles—A Case Study
On-road vehicle emissions are one of the major sources of transport emissions. As a key design factor, road grades (or road slopes) have significant effects on on-road vehicle emissions, particularly on Heavy-Duty Vehicles (HDVs). However, the research into the relationship between road grades and on-road vehicle emissions is very rare in China. Taking a road network in Taiyuan, China, as a stu...
Background and Objective: Polycyclic aromatic hydrocarbons (PAHs) are a group of organic pollutants that are mostly generated during the incomplete combustion. The main objective of this study was to characterize potential sources of PAHs in Tehran. Materials and Methods:, Samples of PM10 were collected at 10 monitoring stations belonging to Tehran Air Quality Control Company (AQCC) and tran...
in the area of automotive engineering there is a tendency to more electrification of power train. in this work control of an induction machine for the application of electric vehicle is investigated. through the changing operating point of the machine, adapting the rotor magnetization current seems to be useful to increase the machines efficiency. in the literature there are many approaches wh...
The number of vehicles has increased significantly in recent years, which causes high density in traffic and further problems like accidents and road congestions. A solution regarding to this problem is vehicle-to-vehicle communication, where vehicles are able to communicate with their neighboring vehicles even in the absence of a central base station, to provide safer and more efficient roads ...
Nanoparticle emissions from road vehicles have been studied extensively in the recent past due to their dominant contribution towards the total airborne particle number concentrations (PNCs) found in the urban atmospheric environment. In view of upcoming tighter vehicle emission standards and adoption of cleaner fuels in many parts of the world, the contribution to urban nanoparticles from non–...
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