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Tongzhu Yu
Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China

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Journal article
Published: 19 August 2021 in Journal of Environmental Sciences
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As compared to conventional diesel heavy-duty vehicles, natural gas vehicles have been proved to be more eco-friendly due to their lower production of greenhouse gas and pollutant emissions, which are causing enormous adverse effects on global warming and air pollution. However, natural gas vehicles were rarely studied before, especially through on-road measurements. In this study, a portable emission measurement system (PEMS) was employed to investigate the real-world emissions of nitrogen oxides (NOx) (nitrogen monoxide (NO), nitrogen dioxide (NO2)), total hydrocarbons (THC), carbon monoxide (CO), and carbon dioxide (CO2) from two liquified natural gas (LNG) China V heavy-duty cleaning sanitation trucks with different weight. Associated with the more aggressive driving behaviors, the vehicle with lower weight exhibited higher CO2 (3%) but lower NOx (48.3%) (NO2 (78.2%) and NO (29.4%)), CO (44.8%), and THC (3.7%) emission factors. Aggressive driving behaviors were also favorable to the production of THC, especially those in the medium-speed range but significantly negative to the production of CO and NO2, especially those in the low-speed range with high engine load. In particular, the emission rate ratio of NO2/NO decreased with the increase of speed/scaled tractive power in different speed ranges.

ACS Style

Jiguang Wang; Huaqiao Gui; Zhiwen Yang; Tongzhu Yu; Xiaowen Zhang; Jianguo Liu. Real-world gaseous emission characteristics of natural gas heavy-duty sanitation trucks. Journal of Environmental Sciences 2021, 115, 319 -329.

AMA Style

Jiguang Wang, Huaqiao Gui, Zhiwen Yang, Tongzhu Yu, Xiaowen Zhang, Jianguo Liu. Real-world gaseous emission characteristics of natural gas heavy-duty sanitation trucks. Journal of Environmental Sciences. 2021; 115 ():319-329.

Chicago/Turabian Style

Jiguang Wang; Huaqiao Gui; Zhiwen Yang; Tongzhu Yu; Xiaowen Zhang; Jianguo Liu. 2021. "Real-world gaseous emission characteristics of natural gas heavy-duty sanitation trucks." Journal of Environmental Sciences 115, no. : 319-329.

Journal article
Published: 26 April 2021 in Atmosphere
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The supersaturated condensation of atmospheric aerosol is important in the study of mechanisms of cloud condensation and even heavy air pollution. The existing technology cannot realize accurate dynamic control of wide range supersaturation, so it is difficult to study condensation growth characteristics of nanoparticles through different levels of supersaturation. Here, a supersaturated condensation growth measurement system with three-stage microscope pipes was developed. The resolution of supersaturated condensation system is 0.14, within the range of 0.92 to 2.33 after calibration. Stabilization time is only about 80 s for saturation range 0.92–1.01, which helps to control saturation rapidly, and the control deviation of saturation is no more than 0.06. Measurement of different supersaturated condensation growth control conditions showed that, the particle size increased significantly compared with hygroscopic growth at high humidity. For single-component particles, the increase in size increased to a similar size at the same saturation, with a difference within 7.4%. The increase in size for ammonium sulfate (AS) increased by 13.4–30.2% relative to that of glucose. For the mixed-component, the increase in size decreased about 15.9–25.0% with the increase of the glucose. Because the glucose coating on the surface of AS have hindered particle growth. This also shows that atmospheric ultrafine particles, especially inorganic salt particles, will rapidly grow into larger particles under supersaturated conditions such as increased environmental humidity, thus having some impact on environmental pollution and climate change.

ACS Style

Jiejie Bian; Huaqiao Gui; Xiuli Wei; Tongzhu Yu; Zhibo Xie; Jie Wang; Jianguo Liu. Development and Application of a Wide Dynamic Range and High Resolution Atmospheric Aerosol Water-Based Supersaturation Condensation Growth Measurement System. Atmosphere 2021, 12, 558 .

AMA Style

Jiejie Bian, Huaqiao Gui, Xiuli Wei, Tongzhu Yu, Zhibo Xie, Jie Wang, Jianguo Liu. Development and Application of a Wide Dynamic Range and High Resolution Atmospheric Aerosol Water-Based Supersaturation Condensation Growth Measurement System. Atmosphere. 2021; 12 (5):558.

Chicago/Turabian Style

Jiejie Bian; Huaqiao Gui; Xiuli Wei; Tongzhu Yu; Zhibo Xie; Jie Wang; Jianguo Liu. 2021. "Development and Application of a Wide Dynamic Range and High Resolution Atmospheric Aerosol Water-Based Supersaturation Condensation Growth Measurement System." Atmosphere 12, no. 5: 558.

Journal article
Published: 24 December 2019 in Journal of Environmental Sciences
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In order to realize accurate dynamic control of supersaturation and to study condensation growth characteristics of nanoparticles through different levels of supersaturation, a series of parametric analyses and systematic comparisons between two-stage and three-stage operating temperature designs were simulated with COMSOL Multiphysics. The simulation results showed that the three-stage operating temperature did not change peak supersaturation compared with two operating temperatures, and the three-stage operating temperature was superior in decreasing the amount of water vapor and the temperature, thus lowering particle loss and variation in detection and collection. The peak supersaturation level increased by 0.3 as the flow rate increased from 0.6 to 2.0 L/min, but the supersaturation peak moved from 0.0027 z0 to 0.08 z0 (i.e., the growth time and the final size decreased by 40%). Peak supersaturation increased as the temperature difference increased or the temperature difference window was shifting left, and minimum activation size decreased. Shifting the 70 °C temperature difference window from 9 °C, 79 °C–1 °C, 71 °C for the condenser and initiator temperatures resulted in peak supersaturation in the centerline being above 5.8, and the activation size changed as low as 1 nm. Experiments with flow rates varying by a factor of 2.5 (from 0.6 to 1.5 L/min) resulted in a final size decrease of 43% (from 3.2 to 1.8 μm), and experimental results of outlet particle size distributions were equivalent with theoretical analysis as the operating temperature was changed.

ACS Style

Jiejie Bian; Huaqiao Gui; Zhibo Xie; Tongzhu Yu; Xiuli Wei; Wenyu Wang; Jianguo Liu. Simulation of three-stage operating temperature for supersaturation water-based condensational growth tube. Journal of Environmental Sciences 2019, 90, 275 -285.

AMA Style

Jiejie Bian, Huaqiao Gui, Zhibo Xie, Tongzhu Yu, Xiuli Wei, Wenyu Wang, Jianguo Liu. Simulation of three-stage operating temperature for supersaturation water-based condensational growth tube. Journal of Environmental Sciences. 2019; 90 ():275-285.

Chicago/Turabian Style

Jiejie Bian; Huaqiao Gui; Zhibo Xie; Tongzhu Yu; Xiuli Wei; Wenyu Wang; Jianguo Liu. 2019. "Simulation of three-stage operating temperature for supersaturation water-based condensational growth tube." Journal of Environmental Sciences 90, no. : 275-285.

Journal article
Published: 12 November 2018 in Sensors
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An aerosol electrometer with enhanced detection limit was developed for measuring the collected particles electrical current ranging from −50 pA to 50 pA with no range switching necessary. The detection limit was enhanced by suppressing the electric current measurement noise and improving the detection efficiency. A theoretical model for the aerosol electrometer has been established to investigate the noise effect factors and verified experimentally. The model showed that the noise was a function of ambient temperature, and it was affected by the characteristics of feedback resistor and operational amplifier simultaneously. The Faraday cup structure of the aerosol electrometer was optimized by adopting a newly designed cup-shaped metal filter which increased the surface area of the cup; thus the particle interception efficiency was improved. The aerosol electrometer performance-linearity, noise and the particle detection efficiency, were evaluated experimentally. When compared with TSI-3068B, a 99.4% (R2) statistical correlation was achieved. The results also showed that the root mean square noise and the peak-to-peak noise were 0.31 fA and 1.55 fA, respectively. The particle detection efficiency was greater than 99.3% when measuring particle diameter larger than 7.0 nm.

ACS Style

Yixin Yang; Tongzhu Yu; Jiaoshi Zhang; Jian Wang; Wenyu Wang; Huaqiao Gui; Jianguo Liu. On the Performance of an Aerosol Electrometer with Enhanced Detection Limit. Sensors 2018, 18, 3889 .

AMA Style

Yixin Yang, Tongzhu Yu, Jiaoshi Zhang, Jian Wang, Wenyu Wang, Huaqiao Gui, Jianguo Liu. On the Performance of an Aerosol Electrometer with Enhanced Detection Limit. Sensors. 2018; 18 (11):3889.

Chicago/Turabian Style

Yixin Yang; Tongzhu Yu; Jiaoshi Zhang; Jian Wang; Wenyu Wang; Huaqiao Gui; Jianguo Liu. 2018. "On the Performance of an Aerosol Electrometer with Enhanced Detection Limit." Sensors 18, no. 11: 3889.

Journal article
Published: 18 May 2018 in Sensors
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A low-noise aerosol electrometer with a wide dynamic range has been designed for measuring the total net charge on high concentration aerosol particles within the range of −500 pA to +500 pA. The performance of the aerosol electrometer was evaluated by a series of experiments to determine linearity, sensitivity and noise. The relative errors were controlled within 5.0%, 1.0% and 0.3% at the range of −40 pA to +40 pA, ±40 pA to ±100 pA, and ±100 pA to ±500 pA respectively. The stability of the designed aerosol electrometer was found to be highly sensitive to temperature variations, but under temperature control, the root mean square noise and the peak-to-peak noise were 1.040 fA and 5.2 fA respectively, which are very close to the calculated theoretical limit of the current noise. The excellent correlation and the advantage of a wide dynamic range have been demonstrated by comparing with the designed aerosol electrometer to a commercial aerosol electrometer. A 99.7% (R2) statistical correlation was obtained; meanwhile, the designed aerosol electrometer operated well even when an overrange phenomenon appeared in the commercial aerosol electrometer.

ACS Style

Yixin Yang; Tongzhu Yu; Jiaoshi Zhang; Wenyu Wang; Huaqiao Gui; Peng Du; Jianguo Liu. Design and Evaluation of an Aerosol Electrometer with Low Noise and a Wide Dynamic Range. Sensors 2018, 18, 1614 .

AMA Style

Yixin Yang, Tongzhu Yu, Jiaoshi Zhang, Wenyu Wang, Huaqiao Gui, Peng Du, Jianguo Liu. Design and Evaluation of an Aerosol Electrometer with Low Noise and a Wide Dynamic Range. Sensors. 2018; 18 (5):1614.

Chicago/Turabian Style

Yixin Yang; Tongzhu Yu; Jiaoshi Zhang; Wenyu Wang; Huaqiao Gui; Peng Du; Jianguo Liu. 2018. "Design and Evaluation of an Aerosol Electrometer with Low Noise and a Wide Dynamic Range." Sensors 18, no. 5: 1614.

Proceedings article
Published: 01 January 2018 in Light, Energy and the Environment 2018 (E2, FTS, HISE, SOLAR, SSL)
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The inorganic compounds in PM2.5 aerosols were measured using a Fourier-transform infrared (FTIR) spectroscopy before Chinese New Year in 2014 in Zhengzhou city, China. We combine the data of gaseous pollutants (NO2 and SO2) to analyze the inorganic compounds in PM2.5 and use the air back trajectories to analyze the effect of transport.

ACS Style

Xiuli Wei; Huaqiao Gui; Jianguo Liu; Minguang Gao; Jiaoshi Zhang; Tongzhu Yu; Yin Cheng. Analysis of the inorganic compounds in PM2.5 aerosols in Zhengzhou using ATR-FTIR method. Light, Energy and the Environment 2018 (E2, FTS, HISE, SOLAR, SSL) 2018, JT2A.15 .

AMA Style

Xiuli Wei, Huaqiao Gui, Jianguo Liu, Minguang Gao, Jiaoshi Zhang, Tongzhu Yu, Yin Cheng. Analysis of the inorganic compounds in PM2.5 aerosols in Zhengzhou using ATR-FTIR method. Light, Energy and the Environment 2018 (E2, FTS, HISE, SOLAR, SSL). 2018; ():JT2A.15.

Chicago/Turabian Style

Xiuli Wei; Huaqiao Gui; Jianguo Liu; Minguang Gao; Jiaoshi Zhang; Tongzhu Yu; Yin Cheng. 2018. "Analysis of the inorganic compounds in PM2.5 aerosols in Zhengzhou using ATR-FTIR method." Light, Energy and the Environment 2018 (E2, FTS, HISE, SOLAR, SSL) , no. : JT2A.15.

Journal article
Published: 21 November 2017 in DEStech Transactions on Environment, Energy and Earth Sciences
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A unipolar charger of submicron aerosol particles has been evaluated. Firstly, a high-voltage field ionization method is utilized to produce sufficient free charges, and an external migrating electric field is then utilized to migrate the free charges into a particle-charging region in order to realize the high-efficient charging of aerosol particles. The charger comprises an impact type particle cutter, a particle-charging chamber and a high-voltage power supply. The charger has a compact structure, which is convenient to maintain and can realize the high-efficient charging of aerosol particles below 1μm. The charger can be used in the pre-stage charging of particles on the basis of an electric migration characteristic monitoring device. For large particles (250–600 nm) the extrinsic charging efficiency of the charger with migration electric field are approximately 1.2 times higher than those of the charger with migration electric field. The charger with migration electric field has advantages of extrinsic charging efficiency, which benefit its application in the aerosol particle charging.

ACS Style

Tong-Zhu Yu; Yi-Xin Yang; Jian-Guo Liu; Hua-Qiao Gui; Jiao-Shi Zhang; Yin Cheng; Jie Wang. Evaluation of a High Efficiency Unipolar Charger for Aerosol Particles. DEStech Transactions on Environment, Energy and Earth Sciences 2017, 1 .

AMA Style

Tong-Zhu Yu, Yi-Xin Yang, Jian-Guo Liu, Hua-Qiao Gui, Jiao-Shi Zhang, Yin Cheng, Jie Wang. Evaluation of a High Efficiency Unipolar Charger for Aerosol Particles. DEStech Transactions on Environment, Energy and Earth Sciences. 2017; (edep):1.

Chicago/Turabian Style

Tong-Zhu Yu; Yi-Xin Yang; Jian-Guo Liu; Hua-Qiao Gui; Jiao-Shi Zhang; Yin Cheng; Jie Wang. 2017. "Evaluation of a High Efficiency Unipolar Charger for Aerosol Particles." DEStech Transactions on Environment, Energy and Earth Sciences , no. edep: 1.

Journal article
Published: 01 January 2017 in Atmospheric Environment
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ACS Style

Jiaoshi Zhang; Zhenyi Chen; Yihuai Lu; Huaqiao Gui; Jianguo Liu; Wenqing Liu; Jie Wang; Tongzhu Yu; Yin Cheng; Yong Chen; Baozhu Ge; Yu Fan; Xisheng Luo. Characteristics of aerosol size distribution and vertical backscattering coefficient profile during 2014 APEC in Beijing. Atmospheric Environment 2017, 148, 30 -41.

AMA Style

Jiaoshi Zhang, Zhenyi Chen, Yihuai Lu, Huaqiao Gui, Jianguo Liu, Wenqing Liu, Jie Wang, Tongzhu Yu, Yin Cheng, Yong Chen, Baozhu Ge, Yu Fan, Xisheng Luo. Characteristics of aerosol size distribution and vertical backscattering coefficient profile during 2014 APEC in Beijing. Atmospheric Environment. 2017; 148 ():30-41.

Chicago/Turabian Style

Jiaoshi Zhang; Zhenyi Chen; Yihuai Lu; Huaqiao Gui; Jianguo Liu; Wenqing Liu; Jie Wang; Tongzhu Yu; Yin Cheng; Yong Chen; Baozhu Ge; Yu Fan; Xisheng Luo. 2017. "Characteristics of aerosol size distribution and vertical backscattering coefficient profile during 2014 APEC in Beijing." Atmospheric Environment 148, no. : 30-41.