Arc discharge regulation of a megawatt hot cathode bucket ion source for the experimental advanced superconducting tokamak neutral beam injector

Arc discharge of a hot cathode bucket ion source tends to be unstable what attributes to the filament self-heating and energetic electrons backstreaming from the accelerator. A regulation method, which based on the ion density measurement by a Langmuir probe, is employed for stable arc discharge operation and long pulse ion beam generation. Long pulse arc discharge of 100 s is obtained based on this regulation method of arc power. It establishes a foundation for the long pulse arc discharge of a megawatt ion source, which will be utilized a high power neutral beam injection device.     

太平驿电厂施工期洪水预报

岷江上游开展施工期洪水预报尚属首次，且站点不足，人烟烯少，交通不便，设站困难，通讯条件差。为保证施工期洪水预报工作的开展，充分利用现有国家水文站网，并结合本地区水文特点，在考虑当主雨区最近时其汇流时间约为４－８ｈ这一汇流时间的前提下，尽可能选用通讯条件良好的上游预报根据站作为来水控制站，可不作大流域预报而作区间预报，这就克服了上述困难，不仅为建设单位节省了投资，同时也优化了洪水预报方案。     

论剥削前提条件与私营企业主收入属性的界定

对我国私营企业主收入属性的界定，应弄清存在剥削的必要前提条件。辨证地看待两种价值理论，既要看到双方的对立，也要看到双方的共识。要依据社会主义条件下私营企业主收入构成及其特点，从整体上把握其性质。     

西安古建筑考察纪略

十月初的一天．《建筑创作》杂志社一行三人应邀到西安参加张锦秋院士作品集；《大唐芙蓉园》的首发式，会后由于“田野新考察报告”专栏的需要．也出于对古都西安城市规划及建筑文化研究的需要．我们决定对西安的古建筑进行一番探访．并为“重走梁思成之路——陕西行”做些先期工作。由于时间所限，此次考察的重点只确定为化觉巷清真大寺和周至老县城。     

Geant4自动建模方法研究

Geant4是一种应用广泛的蒙特卡罗程序包,其计算模型可以用几何描述标记语言(GDML)描述,然而依赖手工建模耗时且容易出错。本文提出一种基于计算机辅助设计(CAD)的Geant4自动建模方法,该方法能够把复杂的CAD几何模型自动转换为Geant4支持的GDML格式几何模型。基于多物理耦合自动建模软件平台MCAM进行了该方法的研究,通过包括聚变反应堆模型FDS-Ⅱ在内的测试例题的测试与校验,初步验证其正确性和有效性。     

Real-time measurement and feedback control of ion temperature profile and toroidal rotation using fast CXRS system in JT-60U

A fast charge exchange recombination spectroscopy (CXRS) system has been developed for the real-time measurement and feedback control of ion temperature (T_i) profile and toroidal rotation velocity (V_t) in JT-60U. In order to control T_i and V_t in real-time, the charge exchange recombination spectroscopy with high time resolution, the real-time processor system, and the real-time control system have been developed. Utilizing this system, real-time control of the T_i gradient between r/a ∼ 0.25-0.5 has been demonstrated with neutral beams at high beta plasmas (normalized beta β_N ∼ 1.6-2.8). The strength of the internal transport barrier is controlled. Moreover, the real-time control of V_t has been demonstrated from counter (anti-parallel to the plasma current, I_p) to co (parallel to the I_p) direction. Then the behavior of edge localized mode (ELM) is changed by controlling the V_t.     

Preliminary experiments on the corrosion of CLAM steel in flowing eutectic LiPb

China low activation martensitic steel (CLAM), which is one of the RAFMs and under development in ASIPP, is considered as the primary candidate structural material for blankets in FDS series fusion reactors and will be in contact with the liquid breeder LiPb, so its corrosion behavior is of significance for its successful application. In the thermal convection LiPb loop DRAGON-I, the corrosion experiment of CLAM in flowing LiPb at 480 °C was performed up to about 2500 h to evaluate the corrosion behavior of CLAM in LiPb. The exposed samples were observed and analyzed, respectively, by metallography and scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) spectroscopy after 500, 1000, 1500, 2000 and 2500 h corrosion experiments, respectively. The results show that the corrosive attack started with the dissolution of the passivated oxides formed during the heat treatment on the surface of CLAM steel. Then the corrosive attack continued further into the steel matrix. The weight loss was about 0.38 mg/cm² after 2500 h exposure.     

中国加入WTO石化企业竞争力面临极大考验

概述了中国加入 WTO的意义 ,分析了加入 WTO后中国石化集团公司面临的种种压力 ;指出在环境改变的同时 ,中国石化集团公司只有改变观念、适应体制、调整结构、技术创新、降低成本、开展国际化经营、加强信息分析整理和营销网络建设 ,才能在国际竞争中立于不败之地。     

SOM描绘天津未来蓝图 智能可持续地区规划

近年来,中国政府和业界领导已对智能性和可持续性兼备的未来城市发展作出意义深远的承诺。而承诺的核心是以科学为基础的城市功能布局所造就的"近距离(尺度)"城市,它们既能互为补充,又能同时推动经济、社会和生态发展。中国在天津滨海新区的努力,已朝这一承诺大步迈进。2007年春,SOM建筑事务所芝加哥办公室接受委托,为一片27km~2的区域编制总体规划,旨在将这一昔日的工业用地转型为繁荣新城。通过活跃的中心商务区、完善的公共交通网络、综合功能的社区邻里以及壮丽的滨河公园,SOM的规划将滨海新区中心商务区定位为全球精英城市网络中的一员——将其发展为经济成功的象征、绿色开发的模范以及容纳健康和可持续生活的载体。