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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
31

Modal vehicle activity on freeways and freeway onramps : an assessment of the oxides of nitrogen emissions impacts resulting from changes in vehicle operating mode due to ramp metering systems

Thornton, Matthew Jaeger 08 1900 (has links)
No description available.
32

Urban air pollution modelling

January 1980 (has links)
Michel M. Benarie. / Includes bibliographies and indexes.
33

Survey of Instrumentation for Air Quality Surveillance

Bowling, John 01 January 1972 (has links) (PDF)
No description available.
34

Site Selection for Air Pollution Monitoring in the Vicinity of Point Sources

Brown, John C. 01 January 1978 (has links) (PDF)
Ever since air pollution became a national concern in the 1950's, more and more emphasis has been placed on collection of representative air samples for many purposed, to include (1) evaluation of the degree to which national ambient air quality standards are being met and (2) to monitor maximum emission levels from point sources. Until recently efforts were directed toward qualitative methods of siting monitors for representative sampling. Since the dispersion of effluents is most complex, the quality of the data collected on the basis of judgment and, more or less, incremental siting about the source, has become suspect. Furthermore, with the increasing demands for monitoring due to international growth in network monitoring systems, amendments to the Clean Air Act and the legislation on the Prevention of Significant Deteoriation of Air Quality, it is not cost-effective to encircle point sources with large numbers of equally spaced monitors. This paper discussed the history of air pollution concerns that have resulted in the need for monitoring; the development of siting techniques through largely qualitative measures; and finally, summarizes three quantitative methodologies for monitoring point sources. Emphasis is placed on the methodology developed by Noll, et al., (1977), based on the author's belief that this methodology represents the state of the art.
35

Simplified real-time PAH measurement techniques

Pierce, Timothy L. January 1982 (has links)
The increased use of residential wood and coal stoves in recent years h.as caused a growing concern for polycyclic aromatic hydrocarbon (PAH) emissions from these stoves. Design of stoves that reduce PAH emissions has been hampered because existing PAH measurement techniques are slow, complex, and expensive. This study investigates two simple, inexpensive, real-time PAH measurement techniques which might be suitable for testing stoves. The first uses a device, called the "moving tape sampler" (MTS), that collects particulate samples on filter paper tape and uses sensitized flourescence to measure total PAH on the tape. The MTS results are compared to the results of a conventional PAH measurement technique, but no definite relationship between the two is found. Uncertainties about the conventional technique make it unclear whether one or both of the techniques give incorrect emission rates. The second method is the use of CO and NO<sub>x</sub> as proxy compounds to infer PAH emissions. A plot of CO emission factors against PAH emission factors suggest CO as a proxy for PAH emissions while a similar plot for NO<sub>x</sub> gives some evidence of NO<sub>x</sub> being an "inverse" proxy for PAH emissions. The lack of a trusted PAH measurement technique has hampered the evaluation of both the MTS and proxy techniques. / Master of Science
36

The biomonitoring of heavy metal pollution in the wood and leaf chemistry of urban trees in Hong Kong

Ho, Ching-yee, Christina., 何靜宜. January 1999 (has links)
published_or_final_version / Geography and Geology / Master / Master of Philosophy
37

Numerical modelling of atmospheric boundary layer with application to air pollutant dispersion

廖俊豪, Liu, Chun-ho. January 1998 (has links)
published_or_final_version / Mechanical Engineering / Doctoral / Doctor of Philosophy
38

Development of analytical methodologies for the determination of metals and organic acids in environmental and traditional Chinesemedicine studies by capillary electrophoresis

董豪珊, Tung, Ho-shan. January 2000 (has links)
published_or_final_version / Chemistry / Doctoral / Doctor of Philosophy
39

Feasibility of using neural network for air dispersion modelling

Yuen, Chi-king., 阮志敬. January 1995 (has links)
published_or_final_version / Environmental Management / Master / Master of Science in Environmental Management
40

Time variable parameter estimation on the wind speed air quality modelin Hong Kong

Tsang, Ho-on, Frederick., 曾可安. January 1995 (has links)
published_or_final_version / Environmental Management / Master / Master of Science in Environmental Management

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