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A neutron detector array was used in a breakup reaction experiment at RIKEN with an 82.5 MeV/u 8He beam impinging on the CH2 and C targets. The array was calibrated using the cosmic ray, the γ ray from the 6 He+Pb reaction and the mono-energetic neutrons from the 7Li(p, n)7Be(g.s.+0.43 MeV) reaction. The position resolution, timing resolution and neutron detection efficiency were obtained accordingly. Cross-talk rejection conditions were developed based on analysis of the data taken from the 7Li(p, n) 7Be(g.s.+0.43 MeV) test experiment, and finally a preliminary two-neutron correlation function for the 8 He breakup reaction was investigated. 相似文献
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以梨园水电站坝前左岸分布的大规模下咱日堆积体为例,通过分析堆积体物质组成及堆积体与基岩接触面的物理力学特性,确定堆积体的边界条件,并初步判定其可能的变形及破坏模式。以此为基础,采用三维极限平衡方法对沿堆积体与基岩接触面的假设滑面及由二维极限平衡分析出的最危险滑弧拟合出的三维空间滑面进行了分析,确定了不同滑面的安全系数。根据有限元三维分析成果,基于位移梯度理论提出了堆积体三维滑面确定方法,分析方法能够搜索任意形式滑面,同时兼顾考虑堆积体的三维效应。分析表明各工况下堆积体稳定性均能满足要求,计算成果为工程设计提供了重要参考。 相似文献
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Efficient calibration methods have been applied to a complex neutron detector array by using the cosmic-ray muons. Through a differential operation on the time difference spectrum, the two edges of this spectrum can be precisely determined, corresponding to the geometrical two ends of the bar, and therefore the relationship between the position and time difference spectrum can be deduced for each bar. The alignment between different bars is realized by choosing cosmic-rays which are perpendicular to the bars. The position resolutions are extracted through a track fitting procedure which uses all tracks detected coincidently by the whole system, together with a simulation analysis. A method is also developed to calibrate the deposited energy by using cosmicrays at different incident angles. 相似文献
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糯扎渡水电站水力设计关键技术研究 总被引:1,自引:0,他引:1
糯扎渡水电站枢纽工程由心墙堆石坝、溢洪道、泄洪隧洞及引水发电系统组成;总泄洪功率高达66940MW;溢洪道最大泄洪流量高达31318m3/s,泄洪最大水头182m,泄洪功率达55860MW,采用了预挖消力塘的消能方案;泄洪隧洞工作水头达120m,采用双孔合一的闸门布置形式,高水头大流量的泄洪消能问题十分突出;尾水隧洞和导流隧洞结合,尾水调压井直径达33m,水力设计复杂;通过计算分析和水工模型试验研究,较好地解决了堆石坝枢纽工程中溢洪道、泄洪隧洞的掺气减蚀、消力塘护岸不护底等水力设计难题,并将运用于工程实践。 相似文献
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牛栏江红石岩堰塞湖为2014年中国云南省鲁甸县“8·03”地震时形成的大型堰塞湖。基于堰塞坝的独特性,在应急抢险完成后,创新性提出“减灾兴利、整治利用”的综合治理理念,将红石岩堰塞湖改造成集防洪、供水、灌溉、发电等功能的大型综合水利枢纽,为世界首座堰塞坝“应急抢险—后续处置—整治利用”一体化水利枢纽工程。本文系统介绍了红石岩堰塞坝形成后应急抢险及后期整治利用的情况,工程已于2019年下闸蓄水,经历了高水位的考验,安全运行。通过本工程实践总结了乏信息条件下应急处置技术及整治利用方案、750m强震碎裂高陡边坡整治关键技术、130m级不连续宽级配堰塞坝综合整治关键技术,可为类似堰塞湖应急抢险及开发利用提供参考。 相似文献