目的:探讨医用回旋加速器的粒子产生与运动机制,为实际工作提供技术支持。方法 :结合设备使用说明书Qilin service manual-maintenance part 10:ion source and central region和Qilin service manual-maintenance part13:extraction sy...目的:探讨医用回旋加速器的粒子产生与运动机制,为实际工作提供技术支持。方法 :结合设备使用说明书Qilin service manual-maintenance part 10:ion source and central region和Qilin service manual-maintenance part13:extraction system以及加速器领域相关参考文献,分析离子源、电磁场和束流引出系统的功能及其运行方法。结果:提出回旋加速器完成对粒子加速具备的必要条件:一是离子源内部形成等离子体,二是电磁场作用,三是经过束流引出系统引导束流轰击至指定靶位,四是需要一个真空系统以及一个供电和控制系统。结论:粒子的产生与运动以及保证束流的品质需要在各个子系统紧密配合下完成,准确理解医用回旋加速器的粒子产生与运动机制对于正确使用回旋加速器具有重要作用。展开更多
In this work, we proposed a novel three-dimensional (3D) plasmonic nanostructure based on porous graphene/nickel foam (GNF) and gas-phase deposited Ag nanoparticles (NPs). Ag NPs with high density were directly deposi...In this work, we proposed a novel three-dimensional (3D) plasmonic nanostructure based on porous graphene/nickel foam (GNF) and gas-phase deposited Ag nanoparticles (NPs). Ag NPs with high density were directly deposited on the surface of 3D GNF by performing a novel cluster beam deposition approach. In comparison with traditional Ag substrate (SiO2/Ag), such hot-spots enriched 3D nanostructure showed extremely high electromag-netic field enhancement under incident light irradiation which could be used as a sensitive chemical sensor based on surface enhanced Raman scattering (SERS). The experimental results demonstrated that the proposed nanostructure showed superior SERS performance in terms of Raman signal reproducibility and sensitivity for the probe molecules. 3D full-wave simulation showed that the enhanced SERS performance in this 3D hierarchical plasmonic nanostructure was mainly obtained from the hot-spots between Ag NPs and the near-field coupling between Ag NPs and GNF sca olds. This work can provide a novel assembled SERS substrate as a SERS-based chemical sensor in practical applications.展开更多
A nanocomposite electrocatalyst was prepared with the method of cluster beam deposition of palladium nanoparticle thin lms on carbon nanoparticle supporting layers and used as sensitive nonenzyme hydrogen peroxide sen...A nanocomposite electrocatalyst was prepared with the method of cluster beam deposition of palladium nanoparticle thin lms on carbon nanoparticle supporting layers and used as sensitive nonenzyme hydrogen peroxide sensors. An enhancement on the electrocatalytic activity of the palladium nanoparticles toward H2O2 reduction was observed, which was related to the coverage of the carbon nanoparticles. With one monolayer of carbon nanoparticles, the H2O2 detection sensitivity reached the maximum, which was more than twice of that of the pure Pd nanoparticles.展开更多
文摘目的:探讨医用回旋加速器的粒子产生与运动机制,为实际工作提供技术支持。方法 :结合设备使用说明书Qilin service manual-maintenance part 10:ion source and central region和Qilin service manual-maintenance part13:extraction system以及加速器领域相关参考文献,分析离子源、电磁场和束流引出系统的功能及其运行方法。结果:提出回旋加速器完成对粒子加速具备的必要条件:一是离子源内部形成等离子体,二是电磁场作用,三是经过束流引出系统引导束流轰击至指定靶位,四是需要一个真空系统以及一个供电和控制系统。结论:粒子的产生与运动以及保证束流的品质需要在各个子系统紧密配合下完成,准确理解医用回旋加速器的粒子产生与运动机制对于正确使用回旋加速器具有重要作用。
基金supported by the National Natural Science Foundation of China (No.11604161)the Natural Science Foundation of Jiangsu Province (No.BK20160914)+2 种基金the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (No.16KJB140009)the Foundation from Nanjing University of Posts and Telecommunication (No.NY216012)the European Union’s Horizon 2020 Research and Innovation Programme under the Marie Sk lodowska-Curie Grant (No.752102)
文摘In this work, we proposed a novel three-dimensional (3D) plasmonic nanostructure based on porous graphene/nickel foam (GNF) and gas-phase deposited Ag nanoparticles (NPs). Ag NPs with high density were directly deposited on the surface of 3D GNF by performing a novel cluster beam deposition approach. In comparison with traditional Ag substrate (SiO2/Ag), such hot-spots enriched 3D nanostructure showed extremely high electromag-netic field enhancement under incident light irradiation which could be used as a sensitive chemical sensor based on surface enhanced Raman scattering (SERS). The experimental results demonstrated that the proposed nanostructure showed superior SERS performance in terms of Raman signal reproducibility and sensitivity for the probe molecules. 3D full-wave simulation showed that the enhanced SERS performance in this 3D hierarchical plasmonic nanostructure was mainly obtained from the hot-spots between Ag NPs and the near-field coupling between Ag NPs and GNF sca olds. This work can provide a novel assembled SERS substrate as a SERS-based chemical sensor in practical applications.
基金supported by the National Natural Science Foundation of China(No.11627806 and No.61301015)supported by a Project funded by the Priority Academic Programme Development of Jiangsu Higher Education Institutions
文摘A nanocomposite electrocatalyst was prepared with the method of cluster beam deposition of palladium nanoparticle thin lms on carbon nanoparticle supporting layers and used as sensitive nonenzyme hydrogen peroxide sensors. An enhancement on the electrocatalytic activity of the palladium nanoparticles toward H2O2 reduction was observed, which was related to the coverage of the carbon nanoparticles. With one monolayer of carbon nanoparticles, the H2O2 detection sensitivity reached the maximum, which was more than twice of that of the pure Pd nanoparticles.
