scholarly journals Methane emissions from on-road vehicles in China: a case study in an urban tunnel

2020 ◽  
Vol 2 (6) ◽  
pp. 061005
Author(s):  
Yanli Zhang ◽  
Xiaoqing Huang ◽  
Shilu Luo ◽  
Chenglei Pei ◽  
Zuzhao Huang ◽  
...  
Keyword(s):  
Methane Emissions ◽  
Road Vehicles

scholarly journals Estimation of uncertainties due to data scarcity in model upscaling: a case study of methane emissions from rice paddies in China

2014 ◽  
Vol 7 (1) ◽  
pp. 181-216 ◽  
Author(s):  
W. Zhang ◽  
T. Li ◽  
Y. Huang ◽  
Q. Zhang ◽  
J. Bian ◽  
...  
Keyword(s):  
Data Sharing ◽  
Spatial Resolution ◽  
Mainland China ◽  
Methane Emissions ◽  
Scale Model ◽  
Rice Paddies ◽  
Data Scarcity ◽  
Estimation Of Uncertainties ◽  
The Impact

Abstract. Data scarcity is a major cause of substantial uncertainties in regional estimations conducted with model upscaling. To evaluate the impact of data scarcity on model upscaling, we introduce an approach for aggregating uncertainties in model estimations. A data sharing matrix was developed to aggregate the modeled uncertainties in divisions of a subject region. In a case study, the uncertainty in methane emissions from rice paddies on mainland China was calculated with a local-scale model CH4MOD. The data scarcities in five of the most sensitive model variables were included in the analysis. The national total methane emissions were 6.44–7.32 Tg, depending on the spatial resolution used for modeling, with a 95% confidence interval of 4.5–8.7 Tg. Based on the data sharing matrix, two numeral indices, IR and Ids, were also introduced to suggest the proper spatial resolution in model upscaling.

A method for reducing fuel consumption of urban scooters using vehicle design and traffic simulation

2016 ◽  
Vol 231 (7) ◽  
pp. 1252-1271
Author(s):  
Yu-An Lin ◽  
Pao-An Chen ◽  
Kuei-Yuan Chan
Keyword(s):  
Fuel Consumption ◽  
Traffic Simulation ◽  
Continuous Variable ◽  
Vehicle Design ◽  
Road Vehicles ◽  
Continuous Variable Transmission ◽  
Traffic Impact ◽  
Variable Transmission ◽  
Traffic Simulations

Vehicular tailpipe emissions have one of the largest impacts on urban air quality. One way to reduce these hazardous emissions is to reduce the amount of fuel consumed by on-road vehicles. In this research, we consider both vehicle design and driver behavior as crucial elements in evaluating the environmental impact of two-wheel vehicles. Any redesign of vehicle specifications, results in different driving patterns that need to be re-evaluated in a realistic environment with traffic simulation. Therefore we developed traffic simulations with mixed fleets to model scooter/driver behaviors to reflect urban driving scenarios. Based on the results, a 31-variable continuous variable transmission (CVT) design and a 14-parameter cellular automata traffic model are integrated. Simultaneous redesign of CVT with traffic simulation can reduce the fuel consumption by 16.2% in our case study. This promising outcome demonstrates the need for multi-discipline integration of real-world traffic impact assessments and improvements.

Nitrous oxide and methane emissions from a subtropical rice–rapeseed rotation system in China: A 3-year field case study

2015 ◽  
Vol 212 ◽  
pp. 297-309 ◽  
Author(s):  
Minghua Zhou ◽  
Bo Zhu ◽  
Nicolas Brüggemann ◽  
Xiaoguo Wang ◽  
Xunhua Zheng ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Methane Emissions ◽  
Field Case ◽  
Rotation System

scholarly journals Comparing methane emissions from different sheep-keeping systems in semiarid regions: A case study of Syria

2014 ◽  
Vol 13 (2) ◽  
pp. 139-147 ◽  
Author(s):  
Omar Hijazi ◽  
Werner Berg ◽  
Samouil Moussa ◽  
Christian Ammon ◽  
Kristina von Bobrutzki ◽  
...  
Keyword(s):  
Methane Emissions ◽  
Semiarid Regions
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