The key technologies of precision blasting were put forward based on the characteristics of urban via- duct blasting demolition in complicated surroundings. Initial bending instability mechanics model of reinforcing s...The key technologies of precision blasting were put forward based on the characteristics of urban via- duct blasting demolition in complicated surroundings. Initial bending instability mechanics model of reinforcing steel bar frame of blasting fragmented pier and sequenced collapsed dynamic model were established for quanti- tative blasting design. Technologies of water pressure blasting were applied in multi-cell box girder fragmenta- tion. The detonating network of non-electric duplication crossover was adopted for the safety and reliability of ultra-long delay. The rationality of blasting scheme and parameters were validated by physical model test. Harm- ful effects were forecasted and controlled by integrated protective technologies. Specialization, cooperation, pre- cision, execution （SCPE） project management method was put forward for precision management. The key tech- nologies of precision demolition blasting can provide reference for similar proiects.展开更多
Since the rise of the Internet in China,China’s local governments have actively used Internet technology to facilitate public administration and public services.What impact,then,have different types of social media h...Since the rise of the Internet in China,China’s local governments have actively used Internet technology to facilitate public administration and public services.What impact,then,have different types of social media had on local governance?This paper,based on years of investigation of J Town and L Sub-district in Shanghai(2012-2018),finds that Internet technology has profoundly transformed the grassroots power structure.Before the rise of the Internet,the grassroots power structure included local government,activists and the masses;in the age of Weibo and home owners forums,grassroots opinion leaders rose,becoming an impressive social force that local government could not afford to ignore;in the age of WeChat,however,the influence of grassroots opinion leaders declined,as local government can interact directly with the masses through WeChat public accounts and WeChat group chats,with the network technology becoming a tool for micromanagement.These three stages correspond to three types of government characterized by limited mobilization,consultation,and user-friendliness,respectively.展开更多
文摘The key technologies of precision blasting were put forward based on the characteristics of urban via- duct blasting demolition in complicated surroundings. Initial bending instability mechanics model of reinforcing steel bar frame of blasting fragmented pier and sequenced collapsed dynamic model were established for quanti- tative blasting design. Technologies of water pressure blasting were applied in multi-cell box girder fragmenta- tion. The detonating network of non-electric duplication crossover was adopted for the safety and reliability of ultra-long delay. The rationality of blasting scheme and parameters were validated by physical model test. Harm- ful effects were forecasted and controlled by integrated protective technologies. Specialization, cooperation, pre- cision, execution （SCPE） project management method was put forward for precision management. The key tech- nologies of precision demolition blasting can provide reference for similar proiects.
基金supported by a grant from the fourth set of the Elite Youth Talent Subprogram of the National Ten Thousand Talents Program
文摘Since the rise of the Internet in China,China’s local governments have actively used Internet technology to facilitate public administration and public services.What impact,then,have different types of social media had on local governance?This paper,based on years of investigation of J Town and L Sub-district in Shanghai(2012-2018),finds that Internet technology has profoundly transformed the grassroots power structure.Before the rise of the Internet,the grassroots power structure included local government,activists and the masses;in the age of Weibo and home owners forums,grassroots opinion leaders rose,becoming an impressive social force that local government could not afford to ignore;in the age of WeChat,however,the influence of grassroots opinion leaders declined,as local government can interact directly with the masses through WeChat public accounts and WeChat group chats,with the network technology becoming a tool for micromanagement.These three stages correspond to three types of government characterized by limited mobilization,consultation,and user-friendliness,respectively.
