Long Zhao

Jan 18, 2025 | nature.com | Xudong WANG |Chengyang Qian |Long Zhao |Luzhou Lin |Zini Cao |Cai Jia

Urban rail transit, as an efficient and eco-friendly mode of transportation, plays a pivotal role in mitigating traffic congestion and lowering urban carbon emissions. Despite the significant contributions by scholars in this area, debates surrounding the quantification of carbon emissions during the operational phase of urban rail transit persist, particularly in assessing its impact on reducing ground traffic congestion. This study examines the passenger flow during Beijing’s morning and evening peak hours, assuming that all passengers initially using urban rail transit switch to buses and taxis during these periods. A traffic congestion prediction model is developed based on the analysis of actual traffic operation data under this assumption. Through this model, the study calculates the potential congestion times across various scenarios, employing a bottom-up approach to carbon emission estimation to analyze the impact on carbon emissions. Results spanning 2015 to 2021 suggest that substituting urban rail transit with buses could increase congestion by 37–92 min and 46–59 min during morning and evening peaks, respectively, leading to a 24-82% and 27-56% surge in carbon emissions. The conversion of all these vehicles to taxis would result in a direct paralysis of Beijing’s road transport network, with a corresponding increase in carbon emissions of between 289% and 556% and 333% and 614%, respectively.These outcomes emphasize the substantial efficacy of urban rail transit in curbing traffic congestion and carbon emissions.

Dec 25, 2024 | mdpi.com | Long Zhao

2.2. Batch Adsorption Experiments 2.2.1. pH EffectThe pH of the solution is a critical factor in the adsorption process, as it impacts the surface charge of both the adsorbent and the adsorbate molecules. The Zeta potential of Si-MPTS-IL at varying pH values is illustrated in Figure 3a. Notably, the Zeta potential of Si-MPTS-IL consistently exceeds +30 mV over the whole pH range. Generally, a high Zeta potential is associated with an enhanced electrostatic attraction for the anionic species (CBB).

Nov 14, 2024 | mdpi.com | Dong Wang |Long Zhao |Jingyi Lin |Yajing Wang

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Nov 6, 2024 | mdpi.com | Chunlei Li |Long Zhao |Jianming Zhang

All articles published by MDPI are made immediately available worldwide under an open access license. No special permission is required to reuse all or part of the article published by MDPI, including figures and tables. For articles published under an open access Creative Common CC BY license, any part of the article may be reused without permission provided that the original article is clearly cited. For more information, please refer to https://www.mdpi.com/openaccess.

Jun 21, 2024 | mdpi.com | Yuanyuan Zhang |Long Zhao

This is an early access version, the complete PDF, HTML, and XML versions will be available soon. Open AccessArticle by Yuanyuan Zhang SciProfiles Scilit Preprints.org Google Scholar and Long Zhao SciProfiles Scilit Preprints.org Google Scholar * School of Environmental and Safety Engineering, Liaoning Petrochemical University, Fushun 113001, China *Author to whom correspondence should be addressed.