Zhen Liu

Nov 12, 2024 | mdpi.com | Jingang Su |Peng Zhang |Zhen Liu |Xingwang Huang

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.

Oct 25, 2024 | preprints.org | Zhen Liu |Lei Zhu |Li Lu |Peng Wang

Preprint Article Version 1 This version is not peer-reviewed Version 1 : Received: 24 October 2024 / Approved: 25 October 2024 / Online: 25 October 2024 (11:49:59 CEST) Liu, Z.; Zhu, L.; Li, Y. T.; Lu, L.; Wang, P. W.; Meng, L. Sediment Abrasion Mechanism at the Leading Edge of an Airfoil: Insights from NACA0012 Wear Tests. Preprints 2024, 2024102034. https://doi.org/10.20944/preprints202410.2034.v1 Liu, Z.; Zhu, L.; Li, Y. T.; Lu, L.; Wang, P. W.; Meng, L.

Aug 30, 2024 | nature.com | Ying Huang |Hongxu Guo |Zhen Liu |Cuiping Liao |Daiqing Zhao

Energy transitions is an effective way to achieve sustainable development in the transportation sector. To explore the pathways to energy transitions in the Guangdong–Hong Kong–Macao Greater Bay Area (GBA) transportation sector, the article evaluated the potential of energy savings and CO2 emission reduction of different measures in a quantitative way, based on the long-range energy alternatives planning (LEAP) platform. The marginal abatement cost curves are used to visually reflect the cost–benefit of these measures, and to develop cost-effective pathways to energy transitions. The results show that the measures of transportation modes adjustment and private cars regulating should be prioritized due to the potential of significant emission reduction with good cost-effectiveness. The measures of promoting electricity and hydrogen energy have large emission reduction potential, but only those for road traffic are cost-effective, and should be treated with a lower priority. Considering the high cost, the measures of promoting biofuel should be implemented as least priority. Moreover, the measures of liquefied natural gas (LNG) application have good cost-effectiveness, as opposed to limited CO2 emission reduction potential. It can only be used as a transitional fuel for the energy transitions. The findings and research methodology will provide theoretical support for the formulation of transportation energy transition pathways in the GBA and other regions.

Jul 24, 2024 | mdpi.com | Wen Jiang |Zhen Liu |Yanping Wang |Yun Lin

1. IntroductionA small unmanned aerial vehicle (UAV) is a kind of aircraft that can fly autonomously or remotely, which has wide application prospects and potential. With the progress of science and technology and the reduction in costs, small UAVs play a vital role in economic construction and social development with their advantages of high efficiency, low cost and multi-aspect monitoring in agricultural plant protection, forest fire fighting, and environmental monitoring, etc. [1].

Jun 28, 2024 | mdpi.com | Zhen Liu |Hao Liu |Yue Ma |Xin Ma

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.