JL
Jiang Li
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2 records found
1
Journal article
(2026)
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Xueren Li, Qinyuan Sun, Jiang Li, Jiawei Ma, Ruipeng Xu, Jiaqi fan, Jie Li, Yidan Shang, Jiyuan Tu, More Authors
Nano-sized particles and elongated mineral particles (EMPs) pose significant inhalation hazards in mineral extraction and processing, and are key contributors to pneumoconiosis, yet their inhalation risks remain inadequately characterized. In this study, a high-fidelity CFD-based modelling framework was developed to systematically investigate inhalation and deposition characteristics of ultrafine and EMPs in an all-in-one human airway model coupled with a breathing region. The size distribution and morphology of mineral dusts were first experimentally examined. A wide range of micro- and nano-sized spherical particles, together with elongated particles with varying aspect ratios, were then numerically simulated with various breathing rates using User-Defined Function. Their transport and deposition patterns were qualitatively visualized and deposition efficiency in total and regional airway areas was systematically evaluated. The outcomes revealed that in the upper airway, micro-sized particles (Formula presented) exhibited high deposition (up to (Formula presented) in the nasal cavity), while nanoparticles remained below 3% and insensitive to breathing rate. In contrast, nanoparticles showed enhanced deep lung penetration, with deposition up to (Formula presented) in the trachea and individual lobes and (Formula presented) reaching pulmonary regions. For EMPs, deposition was strongly morphology-dependent and non-monotonic. High-aspect-ratio particles ((Formula presented) ) showed up to (Formula presented) higher deposition in the nasal cavity compared to other β values, while moderate aspect ratio ((Formula presented) ) yielded the highest deposition efficiency ((Formula presented) ) in the lower airway. This study is expected to highlight the necessity of explicitly accounting for nanoscale effects and particle morphology in assessing inhalation risks associated with mineral dust exposure.
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Nano-sized particles and elongated mineral particles (EMPs) pose significant inhalation hazards in mineral extraction and processing, and are key contributors to pneumoconiosis, yet their inhalation risks remain inadequately characterized. In this study, a high-fidelity CFD-based modelling framework was developed to systematically investigate inhalation and deposition characteristics of ultrafine and EMPs in an all-in-one human airway model coupled with a breathing region. The size distribution and morphology of mineral dusts were first experimentally examined. A wide range of micro- and nano-sized spherical particles, together with elongated particles with varying aspect ratios, were then numerically simulated with various breathing rates using User-Defined Function. Their transport and deposition patterns were qualitatively visualized and deposition efficiency in total and regional airway areas was systematically evaluated. The outcomes revealed that in the upper airway, micro-sized particles (Formula presented) exhibited high deposition (up to (Formula presented) in the nasal cavity), while nanoparticles remained below 3% and insensitive to breathing rate. In contrast, nanoparticles showed enhanced deep lung penetration, with deposition up to (Formula presented) in the trachea and individual lobes and (Formula presented) reaching pulmonary regions. For EMPs, deposition was strongly morphology-dependent and non-monotonic. High-aspect-ratio particles ((Formula presented) ) showed up to (Formula presented) higher deposition in the nasal cavity compared to other β values, while moderate aspect ratio ((Formula presented) ) yielded the highest deposition efficiency ((Formula presented) ) in the lower airway. This study is expected to highlight the necessity of explicitly accounting for nanoscale effects and particle morphology in assessing inhalation risks associated with mineral dust exposure.
Journal article
(2021)
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Jiayi Liu, Zhikai Peng, Xiaoxi Cai, You Peng, Jiang Li, Tao Feng
This study addresses students’ perceptions of using urban green spaces (UGSs) after the easing of COVID-19 lockdown in China. We questioned whether they are still mindful of the risks from the outdoor gathering, or conversely, starting to learn the restoration benefits from the green spaces. Online self-reported surveys were distributed to the Chinese students aging from 14 to 30 who study in Hunan and Jiangsu Provinces, China. We finally obtained 608 complete and valid questionnaire forms from all participants. Their intentions of visiting UGSs were investigated based on the extended theory of planned behavior model. Structural equation modeling was employed to test the hypothesized psychological model. The results have shown good estimation performance on risk perception and perceived knowledge to explain the variances in their attitudes, social norms, and perceived behavior control. Among these three endogenous variables, the perceived behavior control owns the greatest and positive influence on the behavioral intention, inferring that controllability is crucial for students to make decisions of visiting green spaces in a post-pandemic context.
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This study addresses students’ perceptions of using urban green spaces (UGSs) after the easing of COVID-19 lockdown in China. We questioned whether they are still mindful of the risks from the outdoor gathering, or conversely, starting to learn the restoration benefits from the green spaces. Online self-reported surveys were distributed to the Chinese students aging from 14 to 30 who study in Hunan and Jiangsu Provinces, China. We finally obtained 608 complete and valid questionnaire forms from all participants. Their intentions of visiting UGSs were investigated based on the extended theory of planned behavior model. Structural equation modeling was employed to test the hypothesized psychological model. The results have shown good estimation performance on risk perception and perceived knowledge to explain the variances in their attitudes, social norms, and perceived behavior control. Among these three endogenous variables, the perceived behavior control owns the greatest and positive influence on the behavioral intention, inferring that controllability is crucial for students to make decisions of visiting green spaces in a post-pandemic context.