Optical total reflection and transmission with mode control in a dielectric subwavelength nanorod chain

We report a polarization dependent reflection phenomenon beyond the normal incidence with a subwavelength nanorod chain.Light waves of the transverse electric mode will be totally reflected while those of the transverse magnetic mode will transmit through.The total reflection or transmission phenomenon can be seen as a constructive or destructive interference of the incident field with the transverse mode field of the chain.With the low-loss feature and the ultra-compact characteristic,this structure may find applications in photonic circuits.     

ADS注入器Ⅱ超导螺线管的初步测试

介绍了加速器驱动次临界系统（ADS）注入器Ⅱ束流聚焦单元超导螺线管的初步测试。 该测试在高度1 600 mm、 直径510 mm的垂直杜瓦中, 利用型号为cryogenic sms的超导电源对磁体进行了励磁, 并利用霍尔探头测试了其轴向磁场分布情况和漏场情况, 其中心磁场励磁后可达8.20 T, 漏场分布和计算值的相对误差小于10%。 同时, 对励磁过程中骨架的应力应变状态做了测试。 对测试结果的分析表明, 骨架结构设计合理, 应变状态变化平稳, 磁体低温稳定性能良好。The preliminary test of the superconducting solenoid for ADS injectorⅡhas been carried out in order to measure its performances. A vertical dewar with height 1 600 mm and outer diameter 510 mm was employed for this test. The magnet was energized by a cryogenic sms superconducting magnet current source. The axial magnetic distribution and leakage field were also tested through hall probes. The center field can be excited up to 8.20 T and the relative diviation between the measured value and the calculated value of the stray and leakage field is less than 10%. The measurements of the strain and stress status of the magnet skeleton show that the distortion is small and the mechanical performance is robust.     

载药脂质体复合缺钙磷灰石骨水泥支架的研究

采用食盐颗粒浸出法制备了缺钙磷灰石水泥(CPC)多孔支架;用脂质体包裹盐酸万古霉素制备了载药脂质体。将它们两者结合,制备了脂质体载药复合缺钙磷灰石水泥(dl-CPC)支架。结果表明:缺钙CPC多孔支架能够将载药脂质体吸附在其大孔表面或微孔里;dl-CPC支架对MC3T3-E1细胞的生长没有负面影响,显示出良好的细胞相容性。此外,dl-CPC支架具有很好的抗菌性能,能够抑制大肠杆菌生长,抗菌率达99%(12 h)。dl-CPC支架浸泡在磷酸缓冲溶液中,释放药物的速度比较缓慢(前4周);而直接吸附药物的CPC支架,在1周内大部分药物释放出来,出现暴释现象。另结果表明:dl-CPC支架具有缓释药物和骨再生的双重功能,可用于骨缺损的修复及治疗慢性骨髓炎。     

Design of a superconducting magnet for CADS

This paper describes a superconducting magnet system for the China Accelerator Driven System (CADS). The magnetic field is provided by one main, two bucking and four racetrack coils. The main coil produces a central field of up to 7 T and the effective length is more than 140 mm, the two bucking coils can shield most of the fringe field, and the four racetrack superconducting coils produce the steering magnetic field. Its leakage field in the cavity zone is about 5× 10^-5 T when the shielding material Niobium and cryogenic permalloy are used as the Meissner shielding and passive shielding respectively. The quench calculations and protection system are also discussed.