Search Results

On-Road Remote Sensing of Motor Vehicle Emissions: Associations between Exhaust Pollutant Levels and Vehicle Parameters for Arizona, California, Colorado, Illinois, Texas, and Utah

Description: On-road remote sensing has the ability to operate in real-time, and under real world conditions, making it an ideal candidate for detecting gross polluters on major freeways and thoroughfares. In this study, remote sensing was employed to detect carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxide (NO). On-road remote sensing data taken from measurements performed in six states, (Arizona, California, Colorado, Illinois, Texas, and Utah) were cleaned and analyzed. Data mining and exploration were first undertaken in order to search for relationships among variables such as make, year, engine type, vehicle weight, and location. Descriptive statistics were obtained for the three pollutants of interest. The data were found to have non-normal distributions. Applied transformations were ineffective, and nonparametric tests were applied. Due to the extremely large sample size of the dataset (508,617 records), nonparametric tests resulted in "p" values that demonstrated "significance." The general linear model was selected due to its ability to handle data with non-normal distributions. The general linear model was run on each pollutant with output producing descriptive statistics, profile plots, between-subjects effects, and estimated marginal means. Due to insufficient data within certain cells, results were not obtained for gross vehicle weight and engine type. The "year" variable was not directly analyzed in the GLM because "year" was employed in a weighted least squares transformation. "Year" was found to be a source of heteroscedasticity; and therefore, the basis of a least-squares transformation. Grouped-years were analyzed using medians, and the results were displayed graphically. Based on the GLM results and descriptives, Japanese vehicles typically had the lowest CO, HC, and NO emissions, while American vehicles ranked high for the three. Illinois, ranked lowest for CO, while Texas ranked highest. Illinois and Colorado were lowest for HC emissions, while Utah and California were highest. For NO, Colorado ranked highest ...
Access: This item is restricted to the UNT Community Members at a UNT Libraries Location.
Date: May 2003
Creator: Dohanich, Francis Albert
Partner: UNT Libraries

Rebuilding the World with Green BRICs

Description: Poster presentation for the 2010 University Scholars Day at the University of North Texas. This poster discusses social, economic, and global issues and research on rebuilding the world with green, energy-efficient strategies for Brazil, Russia, India, and China (BRIC).
Date: April 15, 2010
Creator: Hubby, Desiree & Engen, Ryan
Item Type: Poster
Partner: UNT Honors College

Radiological and Environmental Research Division Annual Report: Part 4, Atmospheric Physics, January-December 1978

Description: Annual report of the Argonne National Laboratory Radiological and Environmental Research Division regarding activities related to atmospheric chemistry. This report includes studies on dispersion of pollutants to the surface of water near shorelines and steam fog and the exchange of gases across an air-water interface.
Date: 1978
Creator: Rowland, R. E. & Hicks, B. B.
Item Type: Report
Partner: UNT Libraries Government Documents Department

High-Efficiency Solid State Cooling Technologies

Description: Advanced Research Projects Agency-Energy project sheet summarizing general information about the Building Energy Efficiency Through Innovative Thermodevices (BEETIT) program including critical needs, innovation and advantages, impacts, and contact information. This sheet discusses air conditioning that would be more efficient and not use polluting refrigerants as part of the "Non-Equilibrium Asymmetic Thermoelectrics (NEAT) Devices" project.
Date: February 16, 2012
Creator: Sheetak, Inc.
Item Type: Text
Partner: UNT Libraries Government Documents Department

High-Efficiency Stirling Air Conditioning

Description: Advanced Research Projects Agency-Energy project sheet summarizing general information about the Building Energy Efficiency Through Innovative Thermodevices (BEETIT) program including critical needs, innovation and advantages, impacts, and contact information. This sheet discusses air conditioning that would use no polluting refrigerants as part of the "Stirling Air Conditioner for Compact Cooling" project.
Date: February 15, 2012
Creator: Infinia Corporation
Item Type: Text
Partner: UNT Libraries Government Documents Department

Compact Solid State Cooling Systems

Description: Advanced Research Projects Agency-Energy project sheet summarizing general information about the Building Energy Efficiency Through Innovative Thermodevices (BEETIT) program including critical needs, innovation and advantages, impacts, and contact information. This sheet discusses air conditioning that eliminates polluting refrigerants as part of the "Compact MEMS Electrocaloric Module" project.
Date: February 15, 2012
Creator: University of California, Los Angeles
Item Type: Text
Partner: UNT Libraries Government Documents Department