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This article conducts a systematic mapping and inductive analysis of existing work related to hydrogen energy policy in the Web of Science Core Collection from 1996 to 7 July 2023. First, based on bibliometrics, the research reveals the publication volume trends, influential contributors (countries, authors, organizations and journals). Second, bibliometric and content analysis were applied to vividly demonstrate the evolution of the research topic, discuss leading research topics, and provide valuable insights into issues that deserving appropriate attention in the future. The unequivocal role of policies in supporting the development of hydrogen energy is undeniable. In the future, the focal point of hydrogen energy policies should be concentrated on stimulating the creation of demand for green hydrogen, necessitating the effective evaluation of policy outcomes and ensuring the safety of hydrogen energy. Furthermore, the application scope of hydrogen energy extends beyond the transportation sector, holding potential for expansion into other high carbon‐emitting domains. With the strengthening of international collaboration in hydrogen energy, considerations of energy justice and fairness are poised to become pivotal factors in cooperation, exerting a profound influence on the attainment of long‐term development and environmental sustainability. These critical research directions will shape the future landscape of hydrogen energy policy and serve as an essential resource for policymakers, researchers, and stakeholders in this domain. [ABSTRACT FROM AUTHOR]

This document is a summary of a special issue of the Journal of Marine Science & Engineering titled "Advanced Research on Sustainable Maritime Transportation." The issue contains 15 research papers that cover various aspects of sustainable maritime transportation, including green shipping technologies, maritime safety, and sustainable port operations. The research papers explore topics such as the challenges of transitioning to low-carbon fuels for maritime diesel engines, fault-tolerant control strategies for electric ships, the impact of emission control areas on ship orders, and the effectiveness of machine learning methods in predicting a ship's carbon intensity index. Other papers focus on maritime security and sustainable port operations, discussing unmanned surface vessels, maritime safety management, and energy-saving solutions for waste heat recovery on ships. The special issue emphasizes the importance of technological innovation and policy adjustment in achieving sustainability goals in the maritime transportation industry. The research presented in these papers provides scientific guidance and practical directions for the industry's sustainable development. [Extracted from the article]

Gasoline is one of the most consumed light petroleum products in transportation and other industries. This paper proposes a method for optimizing gasoline octane loss using data analysis technology aimed at optimizing the production process and minimizing the loss of gasoline octane. Firstly, the data are screened and the high-dimensional data are reduced to construct the neural network prediction model optimized by genetic algorithm. After utilizing the model for prediction, the optimal operating condition is achieved. Secondly, ensuring that the gasoline emission meets the standard, the octane loss is reduced by adjusting the operating variables. Thirdly, actual data are collected and calculated to obtain the main operating variables and their optimal operating conditions of a petrochemical company affecting the catalytic cracking gasoline S-Zorb unit, thus providing companies using S-Zorb units with reference data for optimizing gasoline catalytic cracking processes. Fourthly, the superiority of the proposed method was verified by comparing it with the other methods. This paper intends to contribute to better modeling the progress of gasoline catalytic cracking by adequately considering the impact of multiple factors, improving the quality of refined oil products of chemical enterprises, saving the economic cost of chemical enterprises, and protecting the atmospheric environment., Author(s): Ji Guo [1,2]; Yujia Lou [1]; Wanyi Wang [1]; Xianhua Wu (corresponding author) [1,2] 1. Introduction As the world's most consumed light petroleum product, gasoline is one of the [...]