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New equipment and technical applications on distribution networks demonstrate a tendency of physical data integration， and distribution network morphology is also changing rapidly. Therefore， adaptability testing and verification on new equipment and technology are required to improve distribution network reliability and resource scheduling capability. To this end， the construction and application of real tests for intelligent distribution networks are studied. Firstly， the purpose of the platform and system composition are analyzed. Secondly， the specific implementation methods of power， neutral point test platform， medium-voltage AC/DC architecture test platform， distribution cables， channel test platform， and other platforms are introduced. Finally， three major test scenarios are designed： earthing test 10 kV primary and secondary fusion circuit breaker， functional assessment test on intelligent fully automatic FA， and fault sensing test on low-voltage transformer area. The true test platform for intelligent distribution networks is applied to make up for the deficiency of the traditional testing methods for distribution networks and equipment.

This paper centers on the core business application—the automatic topology identification in transformer areas—of distribution IoT with new energy as its mainstay. It proposes an automatic topology identification technology testing scheme that considers identification reliability， high identification accuracy， and anti-disturbance capability. Besides， a unique “edge-to-end” interaction test platform for the distribution IoT area is developed. Afterward， the functions and performance of the mainstream technical schemes of Zhejiang Electric Power Co.， Ltd. are evaluated in all aspects. The “active current injection plus frequency-domain signal detection” is selected as the optimal technical scheme for topology identification. The topology identification technology testing and research can lay the application foundation for the subsequent interconnection， intercommunication， and interoperability of the distribution IoT and the transformation of the distribution networks.

It has been a popular topic recently that eco-friendly materials， in place of any other kinds， are used as insulation media for power equipment. So far， the relevant research mostly focuses on the performance optimization of eco-friendly insulating materials. However， little attention is paid to whether or not it can be applied to power distribution equipment. Therefore， performance differences between key equipment in transformation areas for which eco-friendly and traditional insulation media are used respectively. Then， eco-friendly insulation media are used to manufacture distribution transformers， switching cabinets， and power cables， and the electrical performance of the media is evaluated. Finally， a distribution transformer area based on eco-friendly power equipment is constructed. The results show that the eco-friendly power equipment prepared by using vegetable insulating oil， gas mixture C4F7N/CO2 （perfluoroisobutyronitrile/carbon dioxide）， and cable insulation material polypropylene is similar in performance to traditional equipment； it can meet the application demands of power equipment on distribution networks. The results also verify the practicability of power equipment made from eco-friendly insulating media and the compatibility between various equipment， which can provide a reference for implementing and promoting eco-friendly distribution networks in China.

ObjectiveTo explore the effects of anxiety and depression on Internet gaming disorder in medical students， and to evaluate the moderating effect of gender， so as to provide references for the prevention and intervention of Internet gaming disorder in medical students.MethodsIn November 2021， a total of 11 771 medical students from a medical college in Sichuan province participated in an online survey through Wenjuanxing platform. Participants completed the Self-rating Anxiety Scale （SAS）， Self-rating Depression Scale （SDS） and the nine-item Internet Gaming Disorder Scale-Short Form （IGDS9-SF）. Then a hierarchical multiple regression analysis was conducted to discuss the moderating role of gender in the relationships between anxiety， depression and Internet gaming disorder in medical students.Results①Males scored lower on SDS （t=-8.302， P

By aggregating the scattered dispatchable resources in power grids through dispatchable resource aggregation technology， coordination and control technology， and power market trading technology， virtual power plants （VPPs） have brought about mutually interactive operation in a friendly manner. Firstly， the paper summarizes the responsiveness assessment technology for dispatchable resource and the differentiated resource aggregation methods for participation in power markets in terms of VPP- aggregated modeling technology. Secondly， it analyzes different modes of VPP resource organization and market participation aimed at demand-side response and power spot market. Lastly， the paper analyzes key issues of VPPs for new power systems and has a full view of risk management， external environment， market promotion， as well as security potentially incurred by multiparty participation.