排序方式: 共有84条查询结果,搜索用时 15 毫秒
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The design and construction of Beijing Radioactive Ion-beam Facility (BRIF) was started at China Institute of Atomic Energy -CIAE) in 2004. In this project, a 100 MeV high intensity cyclotron, CYCIAE100, is selected as a driving accelerator for radioactive ion beam production. It will provide a proton beam of 75—100 MeV with an intensity of 200—500 μA. The scheme adopted in this design, i.e., stripping the accelerated H-, makes the structure more compact and construction cost much lower. At present, the design for each system has been accomplished. This paper depicts the basic physics design of the machine, including its major structure and parameters, beam dynamics and each relevant system, e.g. basic structure of the main magnet, numerical simulation of the RF resonant cavity, axial injection system, central region, and study on crucial physics problems concerning the extraction and beam lines. The major problems encountered during the design of CYCIAE-100 are also summarized in this paper. 相似文献
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提出了一种三层手征超介质结构,可在光频段实现线极化波的超宽带类二极管效应的不对称传输,同时能实现高效率的交叉极化转换.数值模拟结果显示,该结构实现的线极化波不对称传输参数最高为0.93,而且在111~198 THz频率范围内达到0.9以上,同时交叉极化转换率在该频段上达到97%以上.此外,为更好地理解不对称传输和极化转换,研究了极化旋转角、椭偏度和电场分布情况.研究结果在极化转换器、光学二极管等光学器件中有潜在的应用价值. 相似文献
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Physics design of CYCAIE-100 总被引:2,自引:0,他引:2
The design and construction of Beijing Radioactive Ion-beam Facility (BRIF) was started at China Institute of Atomic Energy -CIAE) in 2004. In this project, a 100 MeV high intensity cyclotron, CYCIAE-100, is selected as a driving accelerator for radioactive ion beam production. It will provide a proton beam of 75—100 MeV with an intensity of 200—500 μA. The scheme adopted in this design, i.e., 相似文献
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强流回旋加速器综合试验装置的磁场测量与垫补 总被引:2,自引:0,他引:2
强流回旋加速器综合试验装置的主体是一台紧凑型回旋加速器, 加速器主磁铁材料的不均匀性, 磁铁加工和安装的非理想因素将引起中心平面的磁场的非理想分布, 因此有必要对其中心平面的磁场进行测量和垫补. 本文主要讲述该综合试验装置的霍尔感应磁场测量系统的设计和使用;通过磁场测量数据分析进行镶条的再加工, 最终实现对等时性磁场和束流的纵向聚焦的垫补;研究与实践了一种对磁场一次谐波进行垫补的方法, 垫补的结果满足了设计的要求. 相似文献
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In this paper, we propose a quantum secret sharing protocol
utilizing polarization modulated doubly entangled photon pairs. The
measurement devices are constructed. By modulating the polarizations
of entangled photons, the boss could encode secret information on
the initial state and share the photons with different members to
realize the secret sharing process. This protocol shows the security
against intercept-resend attack and dishonest member cheating. The
generalized quantum secret sharing protocol is also discussed. 相似文献
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热处理对高温煎煮和低温酶法提制绿茶多糖的影响 总被引:1,自引:0,他引:1
采用复合酶法提取和二乙基氨基乙基(DEAE)-纤维素52(DE-52)柱层析纯化制得茶多糖复合物TPC-1;采用煎煮提取、Sephadex G-200柱层析纯化获得茶多糖(TPC)复合物TPC-2。 高效液相凝胶渗透色谱 蒸发光散射检测表明,TPC-1和TPC-2经98 ℃水浴处理5 h后,TPC-1的主要均一性组分TPC-1a裂变为TPC-1a-1和TPC-1a-2 2个组分;圆二色(CD)谱显示TPC-1在194 nm呈现1个正Cotton效应峰,热处理后在216 nm处增加1个正Cotton效应峰;TPC-2经热处理后其中2种均一性组分TPC-2a和TPC-2b未变化,CD谱显示TPC-2在203、215和272 nm处均呈现显著的的正Cotton效应峰,经热处理后前2个峰消失。 98 ℃水浴热处理改变了低温复合酶法提制的茶多糖复合物TPC-1溶液构象和均一性组分的分布,未改变沸水煎煮提制的TPC-2的均一性组分的分布和凝胶色谱行为,但影响了其溶液构象。 相似文献
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大学物理教学中,一些实际例子的展示有助于培养学生对于相关现象的物理直觉。本文以加深学生对大学物理电磁场部分中时域与频域的关系的认识为目的,借助现代计算机技术,使用有限元方法实现电磁场教学中时域和频域两种研究方法的实时展示。这种直观的展示有助于加深学生对于物理系统时域演化和频域特性的认识。对于更深入的电磁场频谱的教学,本文则展示了利用时域演化和频域耦合两种方法研究电磁波非线性晶体中传播后的系统频谱特性,并对结果进行对比,该方法有利于学生增强对于电磁场时频特性的理解。在教学过程中,通过快速的演示使得同学在掌握这两种方法的同时充分认识两种方法的有效性和局限性,夯实未来学生工程实践过程中的物理认知。 相似文献