Article
Environmental Sciences
Wei Chen, Shijing Wu, Dongmei Liao, Hanping Zhang
Summary: This study investigates the impact of fly ash from a thermal power plant in China on the measurement error of SO2 electrochemical gas sensors. Through experimentation and theoretical calculations, the researchers find that the particle size distribution of fly ash is between 2-11 μm, with an average settling speed of 1.34 x 10(-3) m/s. The deposition time of fly ash affects the measurement error of the sensor, with longer deposition time resulting in larger errors. The influence of fly ash deposition is more significant when measuring low concentration gases.
Article
Multidisciplinary Sciences
Jihwan Kim, Youngdo Kim, Kyler J. Howard, Sang Joon Lee
Summary: In this study, a smartphone-based device was developed for real-time monitoring of suspended particulate matter (PM) using digital holographic microscopy (DHM) and deep learning algorithms. The device can rapidly measure the mass concentrations of different-sized PMs in water, and has the potential to contribute to the development of handheld devices for monitoring suspended pollutants in various media.
SCIENTIFIC REPORTS
(2022)
Review
Environmental Sciences
Long Peng, Zongrui Li, Guohua Zhang, Xinhui Bi, Weiwei Hu, Mingjin Tang, Xinming Wang, Ping'an Peng, Guoying Sheng
Summary: This paper reviews the characterization techniques of effective density (ρe) of aerosol particles currently used in literature, identifying six categories of measurement methods and discussing their respective advantages and disadvantages, as well as outlining future directions for further technical improvement and instrumental development in ρe measurement.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Energy & Fuels
Haoye Liu, Yusong Yu, Chongming Wang, Hongming Xu, Xiao Ma
Summary: This article investigates the Brownian coagulation of particles in the exhaust system of a gasoline engine, revealing significant changes in particle size distribution after the exhaust gas passes through the exhaust plenum chamber. A coagulation model based on classic theory accurately captures measured results and shows that coagulation dominates the particle process in the exhaust system.
Article
Environmental Sciences
Temitope Oluwadairo, Lawrence Whitehead, Elaine Symanski, Cici Bauer, Arch Carson, Inkyu Han
Summary: This study examined the linear relationship and agreement between low-cost particulate matter sensors (LCPMS) and research grade particulate matter (PM) monitors. Results showed that the particle size bins of PM affected the linear relationship, with larger particles having a higher slope and larger error in converted mass concentration.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2022)
Article
Engineering, Chemical
Zhiming Lin, Yingchun Wu, Zhu Zhuo, Xuecheng Wu
Summary: Dual-beam interferometric particle imaging (DIPI) has been extended to measure the size and two-dimensional position of opaque spherical particles in a plane with dual-sheet illumination. A general DIPI model based on geometric optics has been established, and proof-of-concept experiments incorporating digital inline holography (DIH) have been performed for validation. The proposed interferogram processing algorithm shows good accuracy in locating particle position and size.
Article
Engineering, Mechanical
Wu Zhou, Yukun Zhang, Benting Chen, Cameron Tropea, Rixin Xu, Xiaoshu Cai
Summary: This study comprehensively investigated the impact of system and particle parameters on the calibration functions and measurement uncertainties of a two-camera Depth from Defocus imaging system, with experimental verification. It provides explicit recommendations on which quantities are most influential in determining measurement accuracy and must be carefully controlled.
EXPERIMENTS IN FLUIDS
(2021)
Article
Engineering, Electrical & Electronic
Ge Zheng, Yong Yan, Yonghui Hu, Wenbiao Zhang
Summary: The article introduces an innovative instrumentation system for online continuous measurement of particle size distribution based on acoustic emission detection and triboelectric sensing. Experimental tests demonstrate the accuracy and reliability of the developed system in measuring particle size distribution.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Thermodynamics
LongJin Du, Jianzhong Liu, ZeXu Li, WeiJuan Yang
Summary: This study investigates the effects of surfactant, temperature, particle concentration and particle size on the surface tension of B/JP-10 nanofluid fuels. The results show that the addition of surfactants helps to reduce the surface tension of the nanofluid fuel, while the surface tension is higher than that of pure JP-10 and increases with increasing particle concentration and decreases with increasing particle size. The surface tension of the suspended fuel decreases linearly with increasing temperature in a certain temperature range (10-60 degrees C).
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Engineering, Electrical & Electronic
Chunyan Shao, Limin Zhang, Wang Pan
Summary: Cracks on road surfaces are a critical issue in highway management, with their sizes affecting safety and maintenance. The PTZ camera-based image processing method shows promise for crack size measurement.
IEEE SENSORS JOURNAL
(2021)
Article
Environmental Sciences
Yu Wu, Tianhai Cheng, Lijuan Zheng, Yonggen Zhang, Lili Zhang
Summary: Black carbon (BC) is an important aerosol species with significant radiative forcing effects, but the uncertainty in reproducing its morphologically simplified model leads to poorly constrained estimates. By using an aggregate model, we demonstrate that loose BC particles can be underestimated by up to 45% due to morphological simplification, leading to differences of up to 25% in estimated radiative forcing. We also observe that looser and larger BC aggregates exhibit amplified particle sizes through angular scattering. Our findings suggest that the morphological diversity of BC can be neglected at forward scattering angles (<30 degrees), which helps reduce the uncertainty in radiative forcing assessment.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Geography, Physical
Nicholas Cohn, Patrick Dickhudt, John Marshall
Summary: This study demonstrated the use of in-line holography to generate quasi-3D images of saltating particles during aeolian transport events, revealing a vertical fining trend in sediment grain size 50 mm above the bed. An increase in both particle number and sediment concentration with rising wind speeds was observed, while the median grain size coarsened over time despite decreasing wind speeds.
EARTH SURFACE PROCESSES AND LANDFORMS
(2022)
Article
Engineering, Environmental
Jinke Han, Xiaowei Liu, Meng Jiang, Zhaofeng Wang, Minghou Xu
Summary: By utilizing three fixed detectors, this study proposed a method to improve the accuracy of measuring PM mass concentration using laser angular scattering, based on the difference in particle size sensitivity. Correction of PMCS using the asymmetry factor significantly enhanced measurement precision.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Soil Science
C. Polakowski, A. Sochan, M. Ryzak, M. Beczek, R. Mazur, K. Majewska, M. Turski, A. Bieganowski
Summary: The aggregate size distribution of soil is a key parameter in describing soil properties. The traditional dry sieving method may lead to breakdown of less-stable aggregates. This paper presents a modified measurement system using laser diffraction for direct measurement of aggregates on a dry basis, with an average coefficient of variation of about 2.6%.
SOIL & TILLAGE RESEARCH
(2021)
Article
Engineering, Multidisciplinary
Tongtong Mu, Jin Shen, Mengjie Wang, John C. Thomas, Xinjun Zhu, Xi Yuan, Wei Liu, Xianming Sun, Yajing Wang, Jinzhuang Han, Zhenming Liu
Summary: The study shows that increasing flow velocity affects the recovery of particle size distribution via dynamic light scattering, particularly for unimodal and bimodal PSDs. Increasing velocity can lead to errors in peak position and broadening of PSD for unimodal PSD, and can result in a single-peak PSD for bimodal PSD. There is a correlation between velocity and signal noise in measurements, with larger particles having lower signal-to-noise ratio.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2021)
