加速器驱动次临界系统——先进核燃料循环的选择

加速器驱动次临界系统(Accelerator Driven Sub-critical System,ADS)是利用加速器产生的高能强流质子束轰击重核时产生的外源中子,来驱动次临界堆芯中裂变材料发生的持续的链式反应,使得长寿命放射性核素最终变为非放射性的或短寿命的核素,并维持反应堆运行,因而具有该系统所固有的安全性。ADS的中子能谱硬,通量大,能量分布宽,嬗变长寿命核素能力强,可大幅降低核废料的放射性危害,实现核废料的最少化,被国际公认为是核废料处理最有前景的技术途径。文章介绍了ADS研究的国家需求,概述了ADS技术原理及挑战,同时介绍了中国科学院战略性先导科技专项(A类)“未来先进核裂变能——ADS嬗变系统”这一研究课题实施进展情况,并对未来发展进行了展望。     

Identification of a 9/2~-[505] isomer in the neutron-rich ~(193)Os nucleus

The neutron rich nucleus ¹⁹³Os was produced in the ¹⁹²Os(⁷Li, ⁶Li)¹⁹³Os reaction. An isomeric state based on the 9/2^-[505] Nilsson orbital was identified in the present work. The half-life of the isomeric state was extracted and discussed in terms of the K quantum number. A level scheme built on the isomeric state was proposed based on the experimental data.     

HIAF及CiADS项目进展与展望

强流重离子加速器（HIAF）及加速器驱动嬗变研究装置（CiADS）是"十二五"期间国家优先安排建设的16项中的重大科技基础设施。本文介绍了HIAF及CiADS项目意义、科学目标、装置构成及主要特点,对项目实施进展进行了阶段性总结,并对未来发展进行了展望。High Intensity heavy-ion Accelerator Facility (HIAF) and China initiative Accelerator Driven System (CiADS) are among 16 national research facilities built as a priority during China's Twelfth Five Year Plan. In this paper, the scientific feasibility, structures and the features of HIAF and CiADS are briefly summarized. Meanwhile, their present construction progresses are reported and their developments in the near future are outlined.     

DNA原位自组装用于细胞荧光成像分析研究

DNA自组装由于其低毒性、高生物相容性和内置特性,在生物传感、药物递送和临床治疗中发挥着越来越重要的作用.与大多数天然聚合物或合成纤维相比,这些DNA分子相对坚固,可通过序列变异进行修饰.作为侧链连接到聚合物上形成的二级结构赋予DNA结构可设计的响应特性,如对金属离子、蛋白质、pH、DNA、RNA和其他一些小信号分子(...