An NHC‐organocatalyzed remote C(sp3)−H acylation of amides is developed based on a 1,5‐hydrogen atom transfer strategy. As reported in the Research Article by Jun‐Long Li et al. (e202116629), over 120 functionalized δ‐amino ketones and isoquinolinones were synthesized in up to 99 % yield under mild conditions. Mechanistic investigations, including control reactions, KIE experiments, and computational studies, shed light on the organocatalytic radical reaction mechanism.

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Electrical fire is a very important fire type in high-rise building fire. Therefore, it has high research value for risk assessment of electric fire in high-rise buildings. However, it is difficult to accurately obtain the weight index coefficient of electrical fire risk assessment by single qualitative or quantitative risk assessment method, so the reliability and objectivity of electrical fire risk assessment cannot be guarantee. In order to solve this problem, a method of using numerical simulation to obtain different types of fire risk data is proposed. Then, taking fire risk influencing factors as the research object, a comprehensive fire risk evaluation system is established. Through the comprehensive evaluation system, the electrical fire risk data are evaluated to determine the electrical fire risk weight coefficient. The results show that the fire risk quantification scheme of weight coefficient proposed in this paper can eliminate the subjectivity of traditional expert ratings. The proposed evaluation standard is a comprehensive evaluation system based on the numerical simulation and analytic hierarchy process. Above mentioned method can improve the reliability and accuracy of the weight coefficient of electrical fire risk assessment, and provide a theoretical basis for the research and classification of fire risk.

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In order to solve the physical education strategy problem of mobile digital information technology, a structure analysis and research method of systematic knowledge management department is proposed. First of all, the arrival and continuous maturity of the economic era has provided technical support for the development of many fields, especially the progress of information technology to strengthen the advantages of information management. Now the information management has gradually risen to the development stage of knowledge management. Secondly, there are related group learning and teachers’ personal knowledge management questionnaire survey. The statistical results of 178 valid questionnaires collected showed that 100% of teachers admitted that they had participated in different forms and types of group learning, and 91% of preschool teachers believed that they had a basic fixed time and content of group learning. However, 64.2 percent of teachers admitted that they did not consider personal knowledge management at all. For what is a personal knowledge management, 43.8% of the teachers are only heard of the term “personal knowledge management” but do not know the specific meaning. 17.4% of the teachers had heard of it and knew something about it. Only 3.4% of teachers clearly understood the meaning of personal knowledge management, and 35.4% had never heard of the concept of personal knowledge management, let alone the application of personal knowledge management strategies. The results show that how to excavate the structure of knowledge management of sports subject systematically through the innovation of PE teaching strategy, and excavate tacit knowledge and comprehensive explicit knowledge more deeply is the focus of this study. Therefore, from the perspective of knowledge management, an educational information resource management system is proposed, which can classify subject knowledge effectively and intelligently by means of mobile information technology.