Full electromagnetic transient simulation for large power systems

For building Global Energy Interconnection(GEI), it is necessary to implement new breakthroughs on largepower system simulation. Key routes for implementing full electromagnetic transient simulation of large-power systems are described in this paper, and a top framework is designed. A combination of the new large time step algorithm and the traditional small-time step algorithm is proposed where both parts A and B are calculated independently. The method for integrating the Norton equivalence of the power electronic system to the entire power grid is proposed. A two-level gird division structure is proposed, which executes a multi-rate parallel calculation among subsystems and element parallel calculation in each subsystem. The initialization method of combining load flow derivation and automatic trial-and-error launching is introduced. The feasibility of the method is demonstrated through a practical power grid example, which lays a foundation for further research.

Global Community of Disaster Risk Reduction Scientists and Decision Makers Endorse a Science and Technology Partnership to Support the Implementation of the Sendai Framework for Disaster Risk Reduction 2015–2030

At the first gathering of its kind on the role of science in implementing the Sendai Framework for Disaster Risk Reduction 2015–2030,over 750 scientists,policymakers,business people,and practitioners met in Geneva from January 27–29,2016.The UNISDR Science and Technology Conference on the Implementation of the Sendai Framework for Disaster Risk Reduction 2015–2030 fea-

Design and implementation of international agricultural and biological engineering expert management system based on WEB mode

Agriculture and biological engineering are the foundation of agricultural modernization,and related countries have also issued relevant policies to guide the development of agriculture and biotechnology.Agricultural and biological engineering experts are the intellectual resources in the field.At present,there is less research on the management and maintenance of agricultural and biological engineering experts,and there is a lack of software systems in this area.In order to realize the management and maintenance of agricultural and biological engineering expert information,a service platform for the international agricultural and biological engineering expert system based on the B/S framework has been developed.The background of the system used C#as the development language,and the foreground used JavaScript technology and Bootstrap.The software adopted ASP.NET MVC as the web development framework and used the Entity Framework to operate the SQL Server background database.The system has the function of searching and querying agricultural and biological engineering expert information according to keywords,and implements the functions of adding,deleting,and modifying data records,and the function of generating spreadsheets and importing spreadsheet data.The development of this system provides effective management tools for the maintenance and construction of agricultural and biological engineering expert databases and lays a good foundation for the construction of agricultural and biological engineering think tanks.