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激光窗口材料热应力分析研究 被引量:3
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作者 苏雷 曾晓东 《电子科技》 2009年第4期63-65,共3页
利用有限Hankel变换就常见的环形分布激光束情形,推导得到了激光束辐照透过窗口镜引起热传导温度场和热变形分布的理论解,通过分析白宝石、石英两种窗口材料的热变形分布,结果表明,材料的热膨胀系数和热扩散率分别是决定热变形量大小和... 利用有限Hankel变换就常见的环形分布激光束情形,推导得到了激光束辐照透过窗口镜引起热传导温度场和热变形分布的理论解,通过分析白宝石、石英两种窗口材料的热变形分布,结果表明,材料的热膨胀系数和热扩散率分别是决定热变形量大小和空间分布的决定性因素。 展开更多
关键词 激光物理学 激光窗口材料 窗口镜 温度场 应力分析 热变形分布
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Age, Growth and Distribution of the Antarctic Fish Chaenocephalus Aceratus Based on Otoliths 被引量:2
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作者 Ryszard Jacek Traczyk 《Journal of Environmental Science and Engineering(A)》 2015年第8期401-419,共19页
The Chaenocephalus aceratus were sampled in summers between 1979 and 1990. Their otoliths show pattern of daily microincrements as otoliths of similar species--Pseudochaenichthys georgianus and fishes both temperate a... The Chaenocephalus aceratus were sampled in summers between 1979 and 1990. Their otoliths show pattern of daily microincrements as otoliths of similar species--Pseudochaenichthys georgianus and fishes both temperate and tropical waters. Changes of the microincrements growth pattern and otolith shape are described in relation to larval, hatching and metamorphosis stages have similar patterns for Ps. georgianus and Charnpsocephalus gunnari, reflecting similar habitats in their early life. Width of larvae-postlarvae daily increments are: (1.0-1.6)×10-3 SSI, (1.8-2.8)×10-3 SG1 and (1.5-2.4)×10-3 ANI. They were search and chosen automatically from density profiles of otolith tissues. Tissues were prepared by new saving time and materials way--one time up to 40 ones per microscopic glass. Age of fish estimated from microincrements was alike to that inferred from the body length distribution, otoliths mass (age (years) = 140.82 OM (g) + 0.8546) and otolith shape changes--large in length and surface on medial plane. Those parameters create age groups of close neighbours. They have different environments. C. aceratus due to its adaptation to cold water, attain rapidly large body according to a growth equation: Lt= 75.1 ×10-3 (1-e-0.26(t-0.51). Among large fishes there were only females. 展开更多
关键词 Chaenocephalus aceratus otolith shape age of icefish Antarctic fish.
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