Can the geographical proximity of an industry to the“technological knowledge pool”outside its own sector effectively enhance its innovation performance?Are there differences in the effects brought about by geographi...Can the geographical proximity of an industry to the“technological knowledge pool”outside its own sector effectively enhance its innovation performance?Are there differences in the effects brought about by geographical proximity based on different types of linkages?Under the framework of the knowledge production function,this paper empirically examines the innovation performance enhancement effect of differentiated technological knowledge pools formed by directional industrial spatial coagglomeration,using data from the industrial enterprise database and patent database.The findings reveal that the level of industrial innovation is positively influenced by the diverse technological knowledge pools generated through industrial spatial coagglomeration.This conclusion remains valid even after addressing potential endogeneity issues by employing the UK's industrial coagglomeration index as an instrumental variable.In particular,knowledge spillovers serve as the primary mechanism through which industrial coagglomeration is influenced by technological knowledge pools from outside its own sector.The innovation spillover effect of active coagglomeration is significantly greater than that of passive coagglomeration,and the impact of technological knowledge pools on the scale of industrial innovation is slightly stronger than on the quality of innovation.Further research indicates that only active coagglomeration between industries with input-output linkages can significantly enhance the innovation capabilities of both industries,while industrial coagglomeration with technological linkages demonstrates a notable“parasitic effect.”The policy implications of this paper suggest that local governments should thoroughly consider the spatial dependency relationships and historical patterns of inter-industry location selection when developing regionally diversified industrial clusters.Simultaneously,they should strengthen intellectual property protection and industry regulation to achieve high-quality development of regional industries.展开更多
Composite microcrystals of the nitramines(NAs)viz.,RDX,HMX,BCHMX,and CL-20 with electrically conductive polyaniline(PANi)are a charge transfer complexes in coagglomerated composite crystals(CACs).The activation energi...Composite microcrystals of the nitramines(NAs)viz.,RDX,HMX,BCHMX,and CL-20 with electrically conductive polyaniline(PANi)are a charge transfer complexes in coagglomerated composite crystals(CACs).The activation energies of thermolysis,E_(a),of the pure NAs and their PANi-CACs were determined using the Kissinger method,and decomposition processes are discussed.Except for the RDX/PANi CACs,all the other CACs show higher E_(a) values for decomposition compared to their pure NA counterparts.For all CACs,relationships are specified between the E_(a) values,on the one hand,and the squares of the detonation velocities,enthalpies of formation,spark energy and impact sensitivities,on the other.The relationships between their low-temperature heats of decomposition,ΔH,from DSC,and their enthalpy of formation,logarithm of impact sensitivity,electric spark energy,as well as detonation energy,are described.The PANi favorably influences the density of the corresponding CACs;surprisingly close linear correlations were found,and explained,between these densities and the E_(a) values.This presence of PANi strongly increased the electrical spark sensitivity of the CACs in comparison to the base NAs.Based on the results obtained,it can be noted in particular the exceptional desensitization of HMX to impact and the increased sensitivity to electrical spark by coating its crystals with polyaniline.展开更多
基金supported by the major project of the National Social Science Fund of China(No.22&ZD066)the youth program of the National Natural Science Foundation of China(No.72303026)the general program of the China Postdoctoral Science Foundation(No.2022M710693).
文摘Can the geographical proximity of an industry to the“technological knowledge pool”outside its own sector effectively enhance its innovation performance?Are there differences in the effects brought about by geographical proximity based on different types of linkages?Under the framework of the knowledge production function,this paper empirically examines the innovation performance enhancement effect of differentiated technological knowledge pools formed by directional industrial spatial coagglomeration,using data from the industrial enterprise database and patent database.The findings reveal that the level of industrial innovation is positively influenced by the diverse technological knowledge pools generated through industrial spatial coagglomeration.This conclusion remains valid even after addressing potential endogeneity issues by employing the UK's industrial coagglomeration index as an instrumental variable.In particular,knowledge spillovers serve as the primary mechanism through which industrial coagglomeration is influenced by technological knowledge pools from outside its own sector.The innovation spillover effect of active coagglomeration is significantly greater than that of passive coagglomeration,and the impact of technological knowledge pools on the scale of industrial innovation is slightly stronger than on the quality of innovation.Further research indicates that only active coagglomeration between industries with input-output linkages can significantly enhance the innovation capabilities of both industries,while industrial coagglomeration with technological linkages demonstrates a notable“parasitic effect.”The policy implications of this paper suggest that local governments should thoroughly consider the spatial dependency relationships and historical patterns of inter-industry location selection when developing regionally diversified industrial clusters.Simultaneously,they should strengthen intellectual property protection and industry regulation to achieve high-quality development of regional industries.
基金funding from the Student Grant Project no.SGS_2022_003 of the Faculty of Chemical Technology at the University of Pardubice Czechia.
文摘Composite microcrystals of the nitramines(NAs)viz.,RDX,HMX,BCHMX,and CL-20 with electrically conductive polyaniline(PANi)are a charge transfer complexes in coagglomerated composite crystals(CACs).The activation energies of thermolysis,E_(a),of the pure NAs and their PANi-CACs were determined using the Kissinger method,and decomposition processes are discussed.Except for the RDX/PANi CACs,all the other CACs show higher E_(a) values for decomposition compared to their pure NA counterparts.For all CACs,relationships are specified between the E_(a) values,on the one hand,and the squares of the detonation velocities,enthalpies of formation,spark energy and impact sensitivities,on the other.The relationships between their low-temperature heats of decomposition,ΔH,from DSC,and their enthalpy of formation,logarithm of impact sensitivity,electric spark energy,as well as detonation energy,are described.The PANi favorably influences the density of the corresponding CACs;surprisingly close linear correlations were found,and explained,between these densities and the E_(a) values.This presence of PANi strongly increased the electrical spark sensitivity of the CACs in comparison to the base NAs.Based on the results obtained,it can be noted in particular the exceptional desensitization of HMX to impact and the increased sensitivity to electrical spark by coating its crystals with polyaniline.
