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A novel full-digital real-time neutron flux monitor(NFM) has been developed for the International Thermonuclear Experimental Reactor.A measurement range of 10~9 counts per second is achieved with 3 different sensitive fission chambers.The Counting mode and Campbelling mode have been combined as a means to achieve higher measurement range.The system is based on high speed as well as parallel and pipeline processing of the field programmable gate array and has the ability to upload raw-data of analog-to-digital converter in real-time through the PXIe platform.With the advantages of the measurement range,real time performance and the ability of raw-data uploading,the digital NFM has been tested in HL-2 A experiments and reflected good experimental performance. 相似文献
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Guoliang YUAN 《等离子体科学和技术》2022,24(6):64006
This research presents the development of HL-2A neutron yield measurement which includes 235U fission chamber and BF3 and 3He proportional counters. Equivalent noise formula of the radiation detection signal amplification system was derived to guide the development of the signal amplification system. Then all detectors were calibrated in situ by using the 252Cf neutron source. The neutron yield of the HL-2A during neutral beam heating was analyzed. These results indicate that the developed neutron flux diagnostic system can obtain neutron yield results under various experimental conditions of the HL-2A tokamak, and can provide information on neutron yield. 相似文献
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简述了各种气相聚乙烯催化剂的国内外发展状况,包括铬系催化剂、齐格勒-纳塔催化剂、茂金属催化剂、后过渡金属催化剂、双功能催化剂和复合催化剂等。 相似文献
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为了提高航空耳片结构疲劳性能,建立TC4钛合金耳片孔开缝衬套冷挤压与干涉配合复合强化有限元模型,分析了复合强化工艺参数对孔周塑性变形及结构疲劳寿命的影响。设计耳片孔周残余应力测试试验,验证了模型的准确性。复合强化工艺参数的研究结果表明:孔壁材料随芯棒的塑性流动使孔壁变形量在厚度方向上分布不均,弹塑性边界随挤压量的增长向耳片外侧转移;交变载荷下应力幅值的最大值始终位于孔壁处,且入口处应力水平最高;针对TC4钛合金耳片结构,3%挤压量与1%干涉量的复合强化工艺参数组合,疲劳寿命增益效果最好。 相似文献
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