Results 71 to 80 of about 595 (150)
Application of Bismuth Shielding and Organ Dose Modulation Techniques in Brain CT Scanning with Different Scanning Baselines [PDF]
Objective: To investigate the effects of bismuth shielding and organ dose modulation (ODM) on image quality and lens radiation dose in brain computed tomography (CT) with different scanning baselines.
Dandan LIU +4 more
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He jishu等离子体中子源是托卡马克中子学分析的重要输入，是连接核聚变等离子体物理和工程设计的桥梁。为了更精确地描绘中子壁负载（Neutron Wall Loading，NWL）的空间分布，开发了一组处理中子源和NWL的独立代码。对托卡马克中的氘氚聚变等离子体放电进行研究，构建了核聚变反应类型以及中子源释放模型，同时也建立了高能量中子对第一壁轰击的理论模型。基于托卡马克等离子体位形，采用“复丝”方法开展了中子源和NWL分布的数值模拟研究。研究结果表明，NWL最大值在外侧中平面附近，比在内侧中平面的高100%以上 ...
杨 文军, 龚 学余, 高 翔
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Control of Aerosols after Sodium Fire Accident in Integrated Fast Reactor [PDF]
Styrene-acrylate emulsion fixation agent is used in control of radioactive aerosols of integrated fast reactors. In integrated fast reactor design, radioactive aerosol control represents a critical safety requirement.
CUI Chunsheng, CHEN Ran, WANG Chuangao, PANG Hongchao, LUO Zhiping, HUANG Xin
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Fushe yanjiu yu fushe gongyi xuebao核工程应用的发展对中子吸收材料的性能提出了更严苛的要求。本文系统综述了核设施用中子吸收材料的研究进展，重点探讨了含硼金属基与陶瓷基复合材料的设计、性能优化及工程应用，并简要介绍了其他中子吸收材料。含硼金属基材料如硼钢和硼铝合金具有良好的加工性能与机械强度，但面临硼偏析、辐照脆化等问题，通过微合金化与热加工工艺优化可显著改善其综合性能。陶瓷基材料以碳化硼为代表，具有优异的中子吸收能力和热稳定性，但其本征脆性和辐照诱导非晶化问题需通过增韧相引入和界面工程加以调控。此外 ...
毛 志臣, 陈 磊, 徐 晓
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Research on the Absolute Measurement Methodology of Air Kerma for N-60～N-350 X-Rays [PDF]
With the rapid development of nuclear technology applications，the demand for medium- to high-energy X-rays has been increasing substantially，accompanied by urgent requirements for absolute measurement capabilities and measurement ranges of air kerma ...
Daqian HEI +4 more
core +1 more source
Shuitu Baochi Xuebao, 2017 为了揭示冀西北坝上干旱区三北防护林主要树种北京杨的耗水特征，采用热扩散式茎流仪研究了不同健康等级北京杨的树干液流特征，同时分析了气象因素和个体生长状态对树干液流的响应。结果表明：北京杨树干边材液流无论是晴天还是阴天均表现出明显的昼夜变化规律，晴天启动早，停止晚；夜间也存在树干液流，健康杨树个体夜间耗水贡献率为2.50%～5.60%，不健康单株夜间耗水贡献率高达8.37%～21.20%。不同健康等级杨树个体水分消耗在0.01水平存在差异，不健康个体日均耗水量为（22.95±5.99）L，仅为健康单株的27.
马长明, 马玉洁, 程月明
doaj
WEAPONS BASED ON NEW PHYSICAL PRINCIPLES:
International Journal of Law in Changing WorldIn today’s rapidly shifting geopolitical landscape, there is growing concern about weapons based on new physical principles—technologies that remain largely unknown to the public but may pose significantly greater threats than conventional arms.
Elona Abasalieva
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85Kr Thickness Gauge Source in Measuring the Areal Density of Lithium Battery Electrodes [PDF]
In order to meet the widespread application of 85Kr thickness gauge sources in the new energy lithium battery industry，an application study was conducted on the thickness gauge's use in measuring the coating areal density of lithium battery electrodes ...
Binbin LIANG +3 more
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He jishu硼中子俘获治疗（Boron Neutron Capture Therapy，BNCT）是一种新兴的放射治疗技术，而呼吸运动是BNCT治疗肺癌影响剂量准确度的关键问题。为了量化呼吸运动对BNCT治疗肺癌的剂量学影响，采用蒙特卡罗模拟方法构建肺癌治疗中肿瘤及器官随呼吸运动时空变化的动态模型，并开展BNCT蒙特卡罗剂量计算。本文基于多功能数智化蒙特卡罗程序平台（Multi-function and Generalized Intelligent Code-bench based on Monte Carlo ...
朱 琳 +9 more
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Combining Low-dose Perfusion with Dual-energy CT Scanning for Pancreatic Neuroendocrine Tumors [PDF]
Objectives: This study explores the clinical value of one-time, low-dose pancreatic CT perfusion combined with dual-energy scanning for detecting pancreatic neuroendocrine tumors. Methods: We retrospectively analyzed data from 23 patients with surgically
Chunhui SHAN +5 more
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