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机载电子散热设备气流分布均匀性研究 被引量:5
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作者 范涛峰 任童 +1 位作者 彭孝天 冯诗愚 《航空科学技术》 2020年第8期42-47,共6页
长流程的散热设备经常会出现流量分配不均匀的问题,导致散热设备各处的冷却效果产生较大差异。利用计算流体力学(CFD)对一个采用孔板送风的机载电子散热设备进行了模拟,分析了不同孔径、开孔数及流量对出口均匀度的影响。结果显示开孔... 长流程的散热设备经常会出现流量分配不均匀的问题,导致散热设备各处的冷却效果产生较大差异。利用计算流体力学(CFD)对一个采用孔板送风的机载电子散热设备进行了模拟,分析了不同孔径、开孔数及流量对出口均匀度的影响。结果显示开孔数对均匀度的影响大于孔径,流量改变对均匀度影响不大。对长流程孔板形式出口的散热设备设计具有一定的指导作用。 展开更多
关键词 机载电子设备 均匀度 孔板 数值模拟
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潮湿彩绘陶加固材料对比研究及应用
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作者 范陶峰 张慧 杨隽永 《文物保护与考古科学》 北大核心 2019年第2期14-21,共8页
针对考古出土的彩绘陶存在脆弱易毁、难以保存的问题,选择明胶和水性氟碳作为潮湿彩绘陶片的加固材料,采用不同浓度的加固材料对4种颜色彩绘陶片进行加固,并对加固前后的强度、色差以及光泽度进行检测和对比,结果表明较为理想的浓度选... 针对考古出土的彩绘陶存在脆弱易毁、难以保存的问题,选择明胶和水性氟碳作为潮湿彩绘陶片的加固材料,采用不同浓度的加固材料对4种颜色彩绘陶片进行加固,并对加固前后的强度、色差以及光泽度进行检测和对比,结果表明较为理想的浓度选择为明胶在1%左右,水性氟碳浓度在20%左右。同时,对有底层和无底层两种类型的彩绘陶片进行加固对比实验,发现经明胶加固及老化后,有底层试样的色差和光泽度变化比无底层试样小;经水性氟碳加固后,有底层试样的色差和光泽度变化比无底层试样小,但老化后,则相反。在实践应用时,选用这两种材料对盱眙出土的一组潮湿彩绘陶进行了抢救性加固保护,都取得理想的效果。 展开更多
关键词 潮湿 彩绘陶 加固 明胶 水性氟碳
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Discussion on manufacturing techniques of Chen Zhang Pot 被引量:1
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作者 fan taofeng Wan Li Zhang Hui 《China Foundry》 SCIE CAS 2013年第1期1-6,共6页
The Chen Zhang Pot, made in the late Warring States period is an openwork bronze pot with gold and silver inlay. It was identified as a first-class historical relic of the nation by the State Administration of Cultura... The Chen Zhang Pot, made in the late Warring States period is an openwork bronze pot with gold and silver inlay. It was identified as a first-class historical relic of the nation by the State Administration of Cultural Heritage in 2001. To explore its manufacturing techniques, XRF, CT and X-Ray photograph microscopic observation were adopted for the non-destructive examination of the Chen Zhang Pot. The analysis data show that many parts of the Chen Zhang Pot were cast separately, and then assembled. It also shows that the composition proportion of each part of the Chen Zhang Pot is different; and the bronze color, hardness and tensile strength are different for each alloy proportion. A variety of decoration techniques were adopted in the manufacturing process, which make the color more diverse and gorgeous. The openwork decoration is the most complex part of the pot, and the gold and silver decoration technique also represents the high level manufacturing technology in the Warring States period. In summary, the Chen Zhang Pot is a unique art treasure, and as a specimen it allows us to study the bronze casting technology in the Warring States period. 展开更多
关键词 Chen Zhang Pot historical relic manufacturing technology
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