中子散射技术利用中子不带电、穿透力极强、能直接鉴别核素、较之 X 射线对轻元素灵敏、具有磁矩和粒子、波动二重性等特点,使之成为一种独特的、从原子和分子尺度上研究各种物质结构和微观世界运动规律的高新技术。中国先进研究堆 (CA...中子散射技术利用中子不带电、穿透力极强、能直接鉴别核素、较之 X 射线对轻元素灵敏、具有磁矩和粒子、波动二重性等特点,使之成为一种独特的、从原子和分子尺度上研究各种物质结构和微观世界运动规律的高新技术。中国先进研究堆 (CARR)上的中子散射工程将充分利用中国先进研究堆为中子散射工程提供的高通量、具有冷中子源、切向水平孔道等有利条件,建造三台新谱仪,更新原有的五台谱仪,瞄准世界先进水平,建立起研究手段基本配套、基本上覆盖中子散射研究的主要领域、强调应用又具备必要的基础研究能力的中子散射设备,为生命科学、材料科学、物理、化学、地矿、环境等各种学科及工程技术方面的研究,为国防工业和国民经济的应用提供先进的中子散射技术。其最终目标是建立起符合我国国情、其综合研究能力与世界先进水平接轨的中子散射国家重点实验室,使之成为我国二十一世纪中子散射研究和应用的中心及人才培养基地。展开更多
The China Advanced Research Reactor (CARR) is scheduled to be operated in the autumn of 2008.In this paper,we report preparations for installing the neutron radiography instrument (NRI) and for utilizing it efficientl...The China Advanced Research Reactor (CARR) is scheduled to be operated in the autumn of 2008.In this paper,we report preparations for installing the neutron radiography instrument (NRI) and for utilizing it efficiently. The 2-D relative neutron intensity profiles for the water-vapor two-phase flow inside the robe were obtained using the MCNP code without influence of y-ray and electronic-noise.The MCNP simulation of the 2-D neutron intensity profile for the water-vapor two-phase flow was demonstrated.The simulated 2-D neutron intensity profiles could be used as the benchmark data base by calibrating part of the data measured by the CARR-NRI.The 3-D objective images allow us to understand the flow pattern more clearly and it is reconstructed using the MATLAB through the threshold transformation techniques.And thus it is concluded that the MCNP code and the MATLAB are very useful for constructing the benchmark data base for the investigation of the water-vapor two-phase flow using the CARR-NRI.展开更多
文摘中子散射技术利用中子不带电、穿透力极强、能直接鉴别核素、较之 X 射线对轻元素灵敏、具有磁矩和粒子、波动二重性等特点,使之成为一种独特的、从原子和分子尺度上研究各种物质结构和微观世界运动规律的高新技术。中国先进研究堆 (CARR)上的中子散射工程将充分利用中国先进研究堆为中子散射工程提供的高通量、具有冷中子源、切向水平孔道等有利条件,建造三台新谱仪,更新原有的五台谱仪,瞄准世界先进水平,建立起研究手段基本配套、基本上覆盖中子散射研究的主要领域、强调应用又具备必要的基础研究能力的中子散射设备,为生命科学、材料科学、物理、化学、地矿、环境等各种学科及工程技术方面的研究,为国防工业和国民经济的应用提供先进的中子散射技术。其最终目标是建立起符合我国国情、其综合研究能力与世界先进水平接轨的中子散射国家重点实验室,使之成为我国二十一世纪中子散射研究和应用的中心及人才培养基地。
基金Supported by National Natural Science Foundation of China (Grant No.50876080)
文摘The China Advanced Research Reactor (CARR) is scheduled to be operated in the autumn of 2008.In this paper,we report preparations for installing the neutron radiography instrument (NRI) and for utilizing it efficiently. The 2-D relative neutron intensity profiles for the water-vapor two-phase flow inside the robe were obtained using the MCNP code without influence of y-ray and electronic-noise.The MCNP simulation of the 2-D neutron intensity profile for the water-vapor two-phase flow was demonstrated.The simulated 2-D neutron intensity profiles could be used as the benchmark data base by calibrating part of the data measured by the CARR-NRI.The 3-D objective images allow us to understand the flow pattern more clearly and it is reconstructed using the MATLAB through the threshold transformation techniques.And thus it is concluded that the MCNP code and the MATLAB are very useful for constructing the benchmark data base for the investigation of the water-vapor two-phase flow using the CARR-NRI.
