Results 71 to 80 of about 651 (153)
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
core +1 more source
Dianci bileiqi, 2017 针对雷电电磁波引起电子信息设备损坏造成经济损失的问题,利用理论和实验相结合的方法,建立了天线接收雷电电磁波信号的等效电路模型,对雷电波近场和远场进行辐射耦合。对比分析各线天线和宽带天线耦合雷电波的电压峰峰值及能量,得出雷电流主要分布在低频部分,且随着频率的升高而递减,需特别注意防止低频率雷电波侵入的结论,这对于防雷工程设计具有指导意义。同时提出了宽带天线能更准确拟合雷电电流和雷电电磁脉冲大小以及变化趋势的宽带天线能量法,对今后雷电监测定位和预报系统的改进以及雷电防护的研究具有参考价值。
朱明星 +5 more
doaj
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
core +1 more source
Dianci bileiqi, 2016 雷电流参数作为雷电理论研究以及工程防护应用的基础,海拔高度变化对其影响不容忽视。为此,采用星载热发射和反射辐射仪全球数字高程模型（ASTER GDEM）数据,填补闪电监测数据中缺乏的海拔信息,分析海拔高度变化对雷电流幅值、闪击频次、闪击密度、陡度等雷电流参数的影响。以贵州为例,提出幅值、陡度随海拔变化的拟合公式的同时,得到的结果:同一海拔高度的正极性雷电流幅值及陡度高于负极性,且随着海拔的上升,差值越大;正极性雷电流幅值、陡度随海拔上升而增大,负极性雷电流幅值、陡度随海拔上升而减小;在一定范围内 ...
吴安坤 +4 more
doaj
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
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
doaj +1 more source
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
core +1 more source
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
doaj +1 more source
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
core +1 more source
Quantitative Computed Tomography Study of Bone Mineral Density for Adults Residents in Foshan [PDF]
Objective: To study the relation between adult vertebral bone mineral density (BMD) and gender and age in Foshan, to explore the average BMD of each age group and osteoporosis (OP) incidence distribution in the region.
Cuiling ZHU +4 more
core +1 more source