渐进成形AA5754和AA6061铝合金的力学性能和显微组织演化（英文）

用单点渐进成形(SPIF)加工两种铝合金(AA5754和AA6061),且分析材料成形后的力学性能和显微组织演化,研究成形参数包括成形角(35°～55°)、进给速度(1～4m/min)、主轴转速(50～1000r/min)和润滑(润滑油、液压油)等的影响。分别通过拉伸试验和光学显微镜表征材料在SPIF前后的力学性能和显微组织演化。结果表明,成形角、进给速度和主轴转速的增大导致AA5754合金中晶粒和AA6061合金中第二相晶粒伸长。AA5754和AA6061铝合金的极限抗拉强度分别提高10%和8%。AA5754铝合金的延展性从22.9%下降到12%,AA6061铝合金的延展性从16%下降到10.7%。对于润滑效果,力学性能对润滑剂的种类不敏感。综上,SPIF过程能改善铝合金的显微组织、提高其强度,但降低其延展性。     

马代拉水电计划区域一体化与环境可持续性

巴西与玻利维亚将共同实施一项水电工程计划(包括4座径流式水电站),该计划将给这两个国家及南美洲广大地区带来巨大的效益。除了有助于该地区的社会经济发展之外,该计划还将有助于增加主要水系的通航河段。介绍了该计划的技术、环境与经济效益和设计特点以及进展情况。     

未来全球水问题的评估

水问题最近已经成为国际政治议程的一部分。虽然某些国家仍然难以解决水问题。但是主要危机不是缺水,而是水质的持续快速恶化和投资不足。这两个问题在全球水问题的辩论中都没有得到足够的重视。此外,到2015年,与水有关的千年发展目标不可能实现,除非消费者为用水服务付费。明确的目标应该是向贫困人群提供补贴。     

伏尔加-卡马河水电梯级运行经验

介绍了俄罗斯欧洲部分的水电梯级开发,特别是建在伏尔加河及其最大支流卡马河上的11座大坝工程及多目标水库。讨论了平均建成时间有40a的这一水电梯级的运行与监测情况以及修复计划。     

226Ra irradiation to produce 225Ac and 213Bi in an accelerator-driven system reactor

This study aims to produce ²²⁹Th using an innovative nuclear reactor concept,i.e.,accelerator-driven system(ADS)reactor.Herein,we investigated the feasibility of producing ²²⁹Th from neutron transmutation of ²²⁶Ra to expand the availability of ²²⁵Ac and ²¹³Bi in a simple model of ADS reactor.ADS reactor comprises two zones,i.e.,an inner zone with a fast neutron spectrum and outer zone with thermal neutron spectrum,which is a subcritical core...     

Design and Testing of Twelve Channel Heterodyne Radiometer for the SINP-Tokamak

A twelve channel radiometer, in the frequency range of 75～110 GHz, has been designed and constructed for the SINP-Tokamak to diagnose second harmonic X-mode electron cyclotron emission (ECE). This frequency range covers approximately 80％ of the plasma cross section in case of a magnetic field of B=1.5 T. For the maximum field of the SINP-Tokamak B=2.0 T, about 50％ is covered. The bandwidth of each channel is 1 GHz, which yields a spatial resolution of δR/R=1.4％ at the low field side and 0.9％ at the high field side.     

Exploration of High Performance Scenarios in HL-2A

The HL-2A tokamak (R=1.64 m, a=0.32～0.4 m, k_x=1.3, δ_x=0.5, B_T=2.8T, I_p=0.48 MA) is under construction in SWIP. The main objectives of the project are to produce more adaptable divertor configuration to study energy exhaust and impurity     

Preliminary Results from the TCABR Tokamak

After a long period of assembling and repairing faulty components, tokamak discharges started this year to be routinely obtained in TCABR. TCABR was brought from Lausanne-Switzerland some years ago. It is a middle size ohmic     

The Protosphera Experiment and the PROTO-PINCH Testbench

Spherical Tori A=R/α<2 were originally proposed by M. Peng and his collaborators at ORNL. They are based on economical (low aspect ratio=low volume=low cost) and physical (probable no disruptions, low geodesic curvature,