| Effect of biodiesel fuels on real-world emissions of passenger locomotives BM Graver, HC Frey, J Hu Environmental Science & Technology 50 (21), 12030-12039, 2016 | 28 | 2016 |
| Variability in measured real-world operational energy use and emission rates of a plug-in hybrid electric vehicle HC Frey, X Zheng, J Hu Energies 13 (5), 1140, 2020 | 25 | 2020 |
| Field measurements of 1996 to 2013 model year light duty gasoline vehicles HC Frey, B Yazdani-Boroujeni, J Hu, B Liu, W Jiao Proceedings, 106th Annual Conference, Air & Waste Management Association …, 2013 | 18 | 2013 |
| Comparison of vehicle-specific fuel use and emissions models based on externally and internally observable activity data J Hu, HC Frey, SS Washburn Transportation Research Record 2570 (1), 30-38, 2016 | 14 | 2016 |
| Method for modeling driving cycles, fuel use, and emissions for over snow vehicles J Hu, HC Frey, GS Sandhu, BM Graver, GA Bishop, BG Schuchmann, ... Environmental science & technology 48 (14), 8258-8265, 2014 | 7 | 2014 |
| Comparison of real world light-duty gasoline vehicle emissions for high altitude mountainous versus low altitude piedmont study areas J Hu, HC Frey Proceedings, Annual Conference and Exhibition, Air & Waste Management …, 2017 | 6 | 2017 |
| Measurement of Locomotive Head End Power Engine Fuel and Emissions HC Frey, J Hu Publication, 2015 | 5 | 2015 |
| Contribution of Cold Starts to Real-World Trip Emissions for Light-Duty Gasoline Vehicles J Hu, HC Frey, BY Boroujeni Atmosphere 14 (1), 35, 2022 | 4 | 2022 |
| Field measurements of 1996 to 2013 model year light duty gasoline vehicles. Extended Abstract No. 12942 HC Frey, BY Boroujeni, J Hu, G Sandhu, B Liu, W Jiao, B Graver Proceedings, 106th Annual Meeting of the Air & Waste Management Association …, 2013 | 4 | 2013 |
| Comparison of nitrogen oxides and hydrocarbon exhaust concentration detection methods for portable emission measurement systems applied to locomotive engines J Hu, BM Graver, HC Frey Proceedings of the 108th Annual Meeting of the Air & Waste Management …, 2015 | 3 | 2015 |
| Contribution of cold starts to real-world total trip emissions for light-duty gasoline vehicles HC Frey, J Hu, BY Boroujeni, B Liu 23rd Coordinating Research Council Real World Emissions Workshop, San Diego, CA, 2013 | 2 | 2013 |
| Measurement of Cold Starts and Their Contribution to Real-World Total Trip Emissions for Light Duty Gasoline Vehicles HC Frey, BY Boroujeni, J Hu, B Liu Air & Waste Management Association, 2013 | 2 | 2013 |
| Emissions modeling and implementation into corsim S Washburn, HC Frey, N Rouphail UFTI: University of Florida Transportation Institute, 2016 | 1 | 2016 |
| Locomotive Biofuel Study—Rail Yard and Over the Road Measurements Using Portable Emissions Measurement System HC Frey, BM Graver, J Hu United States. Department of Transportation. Federal Railroad Administration …, 2015 | 1 | 2015 |
| The Correlation of CO Emissions Inside Transit Buses with Vehicle Operation Modes: A Preliminary Case Study B Albrinck, M Lu, J Hu, VK Nemalapuri, H Wei, L Yu ICCTP 2010: Integrated Transportation Systems: Green, Intelligent, Reliable …, 2010 | 1 | 2010 |
| Evaluation of the Effect of Biodiesel on Exhaust Emissions of Locomotive Head End Power Engines J Hu, HC Frey | | 2017 |
| Measurement of locomotive head end power engine fuel and emissions: draft final report. HC Frey, J Hu North Carolina. Dept. of Transportation, 2015 | | 2015 |
| Measurement of Fuel Use and Emissions of Over-Snow Vehicles at Yellowstone National Park L Fox, HC Frey, G Sandhu, B Graver, J Hu | | 2012 |
| Investigation of Traffic Emissions in the Vicinity of An Inner City Elementary School J Hu, M Lu, B Albrinck, C Chaiwatpongsakorn, VK Nemalapuri, H Wei ICCTP 2011: Towards Sustainable Transportation Systems, 4103-4112, 2011 | | 2011 |
| Energy Use and Emissions Rates for A Plug-In Hybrid Electric Vehicle Based on Real-World Measurements X Zheng, J Hu, HC Frey | | |
