Stacks of curved leaves of pyrolytic boron nitride (PBN) were deflected and the force versus deflection data was recorded. From this data, the spring constant for a given spring geometry (radius of curvature of a leaf, width of a leaf, thickness of a leaf, and number of leaves in the stack) was determined.

1999年1月1日 · Stacks of curved leaves of pyrolytic boron nitride (PBN) were deflected and the force versus deflection data was recorded. From this data, the spring constant for a given spring geometry (radius of curvature of a leaf, width of a leaf, thickness of a leaf, and number of leaves in the stack) was determined.

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这年11月，我国在三亚飞行情报区实施了RNP10的洋区PBN航路，建设了4条越洋RNP航路，提高了南中国海北部空域的空中航班流量及飞行安全性，提高了航班运行的灵活性，航班延误现象大幅减少，便捷了途经该空域的相关国际航线城市的空中交通联系。 2015年2月， 京广RNP2平行航路 完成部署，对缓解原有京广航路航班飞行拥挤问题起到重要作用。 2005年10月，美国联邦航空局 (Federal Aviation Administration， FAA）对佛罗里达空域RNAV航路实施优化，重新划设在先 …

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Thus, we identified PBN 2019–138 as the most promising genotype among the four accessions with the highest dry and fresh leaf yield with intermediate antioxidant activity. PBN 2019–332 was also promising with the highest antioxidant activity and lamina to petiole ratio, indicating that much of its leaf yield is from lamina biomass.