Post-processing can effectively improve the resistance to laser damage in multilayer films used in a high power laser system. In this work, HfO_2/SiO_2 multilayer films are prepared by e-beam evaporation and then β-r...Post-processing can effectively improve the resistance to laser damage in multilayer films used in a high power laser system. In this work, HfO_2/SiO_2 multilayer films are prepared by e-beam evaporation and then β-ray irradiation is employed as the post-processing method. The particle irradiation affects the laser induced damage threshold(LIDT),which includes defects, surface roughness, packing density and residual stress. The residual stress that is relaxed during irradiation changes from compressive stress into tensile stress. Our results indicate that appropriate tensile stress can improve LIDT remarkably. In view of the fact that LIDT rises from 8 J/cm^2 to 12 J/cm^2, i.e., 50% increase, after the film has been irradiated by 2.2×10^(13)/cm^2 β-ray, the particle irradiation can be used as a controllable and desirable postprocessing method to improve the resistance to laser induced damage.展开更多
西部陆海新通道是我国新近提出的重要战略安排,对于公共管理研究具有重要价值和意义,但目前在相关研究综述方面还存在进一步探讨的空间。西部陆海新通道主要是一种经济和物流联通的走廊,其概念的诞生在学术和实践上具有深厚的历史脉络,...西部陆海新通道是我国新近提出的重要战略安排,对于公共管理研究具有重要价值和意义,但目前在相关研究综述方面还存在进一步探讨的空间。西部陆海新通道主要是一种经济和物流联通的走廊,其概念的诞生在学术和实践上具有深厚的历史脉络,学者们对其作出了不同的定义和思考。西部陆海新通道经历了从南向通道、国际陆海贸易新通道到西部陆海新通道的转变,其合作主体范围已扩大至“13 + N”。当前对西部陆海新通道的研究相当一部分是从国际经贸或物流运输等角度开展,为从公共管理角度介入西部陆海新通道的理论或实证研究提供了学术参考和可能。The New Western Land-Sea Corridor is an important strategic arrangement recently proposed by China, which is of great value and significance to public management research, but still leaving room for further discussion in the review of related research. The New Western Land-Sea Corridor is mainly a corridor connecting economy and logistics, with the birth of its concept having a profound historical context in both academic and practical terms, on which scholars have given different definitions and reflections. The New Western Land-Sea Corridor had experienced the transformation from the Southern Transport Corridor, the New International Land-Sea Trade Corridor, to the New Western Land-Sea Corridor, with its scope of cooperation entities having expanded to “13 + N”. A considerable part of current research on the New Western Land-Sea Corridor was conducted from the perspective of international economics and trade or logistics and transportation, which provides academic reference and possibility for intervention in the theoretical or empirical study of the New Western Land-Sea Corridor from the perspective of public management.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.11405085)the Jiangsu Provincial Natural Science Fund,China(Grant No.BK20130789)
文摘Post-processing can effectively improve the resistance to laser damage in multilayer films used in a high power laser system. In this work, HfO_2/SiO_2 multilayer films are prepared by e-beam evaporation and then β-ray irradiation is employed as the post-processing method. The particle irradiation affects the laser induced damage threshold(LIDT),which includes defects, surface roughness, packing density and residual stress. The residual stress that is relaxed during irradiation changes from compressive stress into tensile stress. Our results indicate that appropriate tensile stress can improve LIDT remarkably. In view of the fact that LIDT rises from 8 J/cm^2 to 12 J/cm^2, i.e., 50% increase, after the film has been irradiated by 2.2×10^(13)/cm^2 β-ray, the particle irradiation can be used as a controllable and desirable postprocessing method to improve the resistance to laser induced damage.
文摘西部陆海新通道是我国新近提出的重要战略安排,对于公共管理研究具有重要价值和意义,但目前在相关研究综述方面还存在进一步探讨的空间。西部陆海新通道主要是一种经济和物流联通的走廊,其概念的诞生在学术和实践上具有深厚的历史脉络,学者们对其作出了不同的定义和思考。西部陆海新通道经历了从南向通道、国际陆海贸易新通道到西部陆海新通道的转变,其合作主体范围已扩大至“13 + N”。当前对西部陆海新通道的研究相当一部分是从国际经贸或物流运输等角度开展,为从公共管理角度介入西部陆海新通道的理论或实证研究提供了学术参考和可能。The New Western Land-Sea Corridor is an important strategic arrangement recently proposed by China, which is of great value and significance to public management research, but still leaving room for further discussion in the review of related research. The New Western Land-Sea Corridor is mainly a corridor connecting economy and logistics, with the birth of its concept having a profound historical context in both academic and practical terms, on which scholars have given different definitions and reflections. The New Western Land-Sea Corridor had experienced the transformation from the Southern Transport Corridor, the New International Land-Sea Trade Corridor, to the New Western Land-Sea Corridor, with its scope of cooperation entities having expanded to “13 + N”. A considerable part of current research on the New Western Land-Sea Corridor was conducted from the perspective of international economics and trade or logistics and transportation, which provides academic reference and possibility for intervention in the theoretical or empirical study of the New Western Land-Sea Corridor from the perspective of public management.
