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Firstly, the high resolution pictures of dragonfly wings from sample tests were studied thoroughly, and the unique feature of the reticulate vein distribution and the variation of the vein sizes and the grid shapes in different zones were figured out;then several computational models based on a dragonfly wing were established by using ANSYS, and beam 189 and shell 93 elements were used respectively in modeling of the veins and the membrane so as to ensure the compatibility between the veins and the membrane at a deformed state;these models subject to uniform loading cases were analyzed respectively so as to explore the unique performances of the wing structure, furthermore, through eigenvalue spectrum analyses of these models, the special role of the pterostigma in eliminating or suppressing the wing quivering effect was also evaluated.

首先,对实验中获取的高清晰度的蜻蜓膀数码图片进行了细致地分析,找出了膀网状脉结构中脉的分布规律与尺寸变化、网格形状的差异及不同形状网格的分布等独特的结构特征;再利用ANSYS建立蜻蜒膀网状脉结构模型,采用三节点等参数梁元beam189模拟脉和八节点等参数曲壳单元shell93模拟膜,以满足脉和膜间的变形协调性要求;通过非线性数值分析,探索了蜻蜓膀网状脉结构在均布荷载作用下所具有的独特的结构性能;通过模态分析,揭示了膀前缘靠近翼尖附近的痣在膀消震减振中所发挥的作用。

Any of various diurnal moths of the family Sesiidae, having scaleless, transparent wings and a wasplike appearance.

蛾一种透蛾科的朝生暮死的蛾子,有无鳞片、透明的和黄蜂般外观

Geodromicus is one of the largest genera of the subfamily Omaliinae in the family Staphylinidae. It was established by Redtienbacher in 1857 with the type species Staphylinus plagiatus Fabricius.

地隐虫属Geodromicus是隐虫科Staphylinidae、四眼隐虫亚科Omaliinae里的一个大属,由Redtienbacher在1857年建立,模式种为Staphylinus plagiatus Fabricius。

Ants of a called "Staphylinidae" insects are very treasure, because "Staphylinidae" can emit a scent, ants after they smell like a drunk, as seemed to be a great satisfaction, I used to get a "gourmet" entertain guests, and "Staphylinidae" will strive to release a number of gas return to the ants.

蚂蚁对一种叫&隐虫&的昆虫十分爱惜,因为&隐虫&能放出一种气味,蚂蚁们闻到后会像喝醉了酒一样,好像得到了极大的满足,经常拿出&美食&招待客人,而&隐虫&也会努力放出许多气体回报给蚂蚁。

The former' wave width is medium. It feeds mainly on aquatic small insects of order Diptera and Trichoptera, foraging in 5-20cm above water surface and midium- complicated forest by trawling and aerial feeding. The latter's wave width is shortest, which have disadvantage to discriminate targets from enviroment. It feeds mainly on even smaller insects of order Lepidoptera and Diptera, foraging in wide space or sparse-foliage forest by aerial feeding.

为小型蝙蝠,前者声波带宽中等,主要以水生小型的双目、毛目为食,在水面5—20cm和中等复杂的林中进行拖网和空中捕食,后者声波带宽最窄,主要以小型的鳞目、双目昆虫为食,在开阔空间内或稀疏林中进行空中捕食,视觉可能在捕食中具有重要的辅助作用。

Fin spacing and density of the staggered tube bundle have much more influence on its performance, when the distance between fins decreased or the tube distributing density increased, heat transfer of the exchanger will be strengthened and pressure drop will be distinctly aggrandized.

从实验和模拟结果分析可知,实验所得传热因子j较模拟结果有12%范围内的减小,而阻力因子f有4%~16%的增大;片间距和管排密集度对片管换热器性能影响很大,减小片间距和增大管排密集度均能增强换热器的换热效果,但压力损失也明显增加。

The method of CFD numerical simulation is employed to replace experimental investigation. Hence, STAR-CD of the commercial software is used to simulate the outer flow field and heat transfer performance of integrated heat sink with heat pipes cooled by airflow. It is found that simulated results agree with experimental results well, which indicates that simulation method is reasonable and reliable. Further, simulated computations for different fin thickness, fin pitches and air velocities are performed to analyze their effects on heat transfer performance of heat sink. Finally, a new optimized structure of integrated heat sink with heat pipes is provided to meet future demands for cooling CPU and its heat transfer is also evaluated. For multi-heat source and higher dissipation power of electronic devices, the integrated heat sink with heat pipes attatched fins stagged in different positions of channels is presented and its flow and temperature fields are also simulated to enhance heat transfer. As a conclusion, all mentioned above are useful for the design of heat sink with excellent efficiency of heat dissipation and further research.

应用商业软件Star-CD对CPU集成热管散热器的外部流场和传热特性进行了数值模拟,将数值模拟结果和试验结果对比,验证了所提出的数值计算方法是可靠和可行的;利用此数值模拟方法对CPU集成热管散热器在不同散热片间距、厚度和气流速度下散热器的流动与传热性能进行了数值计算,分析了这些参数的变化对散热器传热性能的影响;针对未来CPU冷却的要求,确定了与最优气体流速匹配的最佳片间距、厚度的CPU集成热管散热器的新结构;利用试验评测了根据数值模拟提供的新结构开发出的新CPU集成热管散热器的传热性能;最后在场协同强化传热的理论的基础上,对CPU集成热管散热器的散热片错位排列来强化散热器的散热,满足未来大功率、多热源的电子元件的散热,为今后进一步优化散热器提供了依据。

The sensitive nymph instar and sexual differences of wing dimorphism in the brown planthopper, Nilaparvata lugens , were studied, and the developmental differentiations of both the indirect flight muscles and the wing buds in the brown planthopper were observed. Molecular biological studies were performed to amplify the indirect flight muscle specific actin gene.

本文研究了褐飞虱Nilaparvata lugens型分化的若虫敏感临界龄期和型分化在性别上的差异,观察了褐飞虱间接飞行肌和芽发育的分化过程,在此基础上,以扩增、克隆褐飞虱间接飞行肌特异性肌动蛋白基因为目的,做了部分分子生物学工作。

A bristly structure on the hind wings of certain moths and butterflies that holds the forewings and hind wings together during flight.

缰某些飞蛾和蝴蝶后上的易碎结构,可以在飞行时使前后协调工作

A bristly structure on the hind wings of certain moths and butterflies that holds the forewings and hind wings together during flight.

□某些飞蛾和蝴蝶后上的易碎结构,可以在飞行时使前后协调工作

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This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

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