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Article  |  2021-06-01

Fault-Induced Coal Burst Mechanism under Mining-Induced Static and Dynamic Stresses

Fault is a common geological structure that has been revealed in the process of underground coal excavation and mining. The nature of its discontinuous structure controls the deformation, damage, and mechanics of the coal or rock mass. The interaction between this discontinuous structure and mining activities is a key factor that dominates fault reactivation and the coal burst it can induce. This paper first summarizes investigations into the relationships between coal mining layouts and fault occurrences, along with relevant conceptual models for fault reactivation. Subsequently, it proposes mechanisms of fault reactivation and its induced coal burst based on the superposition of static and dynamic stresses, which include two kinds of fault reactivations from: mining-induced quasi-static stress (FRMSS)-dominated and seismic-based dynamic stress (FRSDS)-dominated. These two kinds of fault reactivations are then validated by the results of experimental investigations, numerical modeling, and in situ microseismic monitoring. On this basis, monitoring methods and prevention strategies for fault-induced coal burst are discussed and recommended. The results show that fault-induced coal burst is triggered by the superposition of high static stress in the fault pillar and dynamic stress from fault reactivation. High static stress comes from the interaction of the fault and the roof structure, and dynamic stress can be ascribed to FRMSS and FRSDS. The results in this paper could be of great significance in guiding the monitoring and prevention of fault-induced coal bursts.

Wu Cai ,   Linming Dou   et al.

Review  |  2021-06-01

Advances in Soft Materials for Sustainable Electronics

In the current shift from conventional fossil-fuel-based materials to renewable energy, ecofriendly materials have attracted extensive research interest due to their sustainability and biodegradable properties. The integration of sustainable materials in electronics provides industrial benefits from wasted bio-origin resources and preserves the environment. This review covers the use of sustainable materials as components in organic electronics, such as substrates, insulators, semiconductors, and conductors. We hope this review will stimulate interest in the potential and practical applications of sustainable materials for green and sustainable industry.

Moon Jong Han ,   Dong Ki Yoon  

Article  |  2021-06-01

Construction of Standards System for Urban and Rural Community Governance

Currently, urban and rural communities have become the new focus of social governance in China; however, the existing standards for urban and rural community governance cannot meet the new demand for governance modernization, and thus a new standards system is required. This study aims to research the development strategy of an urban and rural community governance standards system. In this article, we analyze the demand for standardizing urban and rural community governance in China, summarize the development status of standards systems related to urban and rural community governance in China and abroad, and explore the problems in the standardization in China. Moreover, we propose a preliminary framework and key directions for the standards system, covering general standards, community infrastructure, community information platform, community autonomy, community management, and community service. Considering the focus and weaknesses of urban and rural community governance in the new era, we propose several suggestions from five aspects: Top-level design, pilot demonstration, multi-party participation, overall urban–rural planning, and personnel training.

Wang Yanfang ,   Zhu Wei   et al.

Article  |  2021-06-01

Virtual Urban Transportation System and Decision Support Mode for Transportation Development

Developing a localized virtual urban transportation system (VUTS) and a decision support mode for transportation development is significant for solving the increasingly severe urban traffic problems caused by rapid urbanization and for overcoming the current bottlenecks that restrain the intelligent transportation system development. Based on the advanced information technologies such as big data and Internet technologies, this study establishes a VUTS that is composed of four parts: basic databases, analysis models, software platforms, and alternative plans; the theoretic framework, systematic functions, and technical system of the VUTS are analyzed. Furthermore, a decision support mode for transportation development is proposed; it covers the application scenarios including urban land development, traffic facilities construction, traffic operation control, public transport operation, and traffic policy making. Subsequently, we built the VUTS of Chongqing and provided plans for the municipal government regarding its decision on shifting peaks for residents and vehicles during the outbreak of the COVID-19 epidemic. The case results suggest that the decision support mode based on VUTS is effective in the demonstration of traffic plans. Therefore, we suggest that China attach importance to the VUIS and its application in urban traffic planning and management and incorporate new information technologies to optimize the application effects.

Wang Wei ,   Zhao De   et al.

Article  |  2021-06-01

Standards System Construction in Key Areas of Manufacturing Industry

As the international competitiveness of China’s manufacturing industry continues to improve, the manufacturing industry of China is developing toward a high-quality pattern that pursues quality and efficiency. Hence, constructing a standards system for the manufacturing industry becomes critical for upgrading and internationalizing China’s manufacturing industry as well as commercializing scientific research achievements of the industry. In this article, we summarize the development trends of the standards system for manufacturing, and study the construction of standards systems by focusing on four key areas: equipment manufacturing, new materials, new-generation information technology, and consumer goods; the frameworks, ideas, and key tasks of the standards systems for these areas are clarified. Furthermore, to promote the quality of China’s manufacturing industry, future focus should be laid on standards system research, standards application, standards management mechanism, and international standardization.

Wang Mao ,   Wang Yang   et al.

Article  |  2021-06-01

Innovation and Development Strategies of China’s New-Generation Smart Vehicles Based on 4S Integration

The new-generation smart vehicles are intelligent network terminals that integrate smart vehicle, smart transportation, smart city, and smart energy (i.e., 4S integration). They move flexibly to connect the flow of people, materials, energy, and information of a city, and have more strategic values than traditional vehicles. This study aims to clarify the significance in developing the newgeneration smart vehicles based on 4S integration, determine the technology path for the innovative development of the new-generation smart vehicle industry, and establish a novel technology system by summarizing relevant key technologies. The new-generation smart vehicles based on 4S integration is an upgrade of smart vehicles in terms of value, function, and technology. China should select a smart vehicle technology path considering vehicle infrastructure cooperation to acquire the leadership in scientific and technological innovation. To establish the technology system of the new-generation smart vehicles based on 4S integration, the automation and connectivity levels of vehicles should be coordinated simultaneously, and common basic technologies such as big data, cloud computing, information, and communications should be promoted, together with the core key technologies related to vehicles, roads, and cloud. Furthermore, we propose suggestions from the aspects of top-level design, industrial integration, technological innovation, and practical implementation, hoping to provide theoretical references for long-term development of China’s smart vehicle industry.

Liu Zongwei ,   Song Haokun   et al.

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