Dragonfly is one of the most excellent nature flyers,and its wings exhibit excellent functional characteristics through the coupling and synergy of morphology,configuration,structure and material.The functional charac...Dragonfly is one of the most excellent nature flyers,and its wings exhibit excellent functional characteristics through the coupling and synergy of morphology,configuration,structure and material.The functional characteristics presented by dragonfly wings provide an biological inspiration for the investigation and development of aerospace vehicles and bionics flapping aerocraft flapping-wing micro air vehicles.In resent years,some progresses have been achieved in the researches on the wings' geometric structure,material characteristics,flying mechanism and the controlling mode.In this paper,the functional characteristics of the dragonfly wings including flying,self-cleaning,anti-fatigue,vibration elimination and noise reduction are introduced and the effects of their morphology,configuration,structure and material on the functional characteristics are described.Moreover,the current state of the bionic study on the functional characteristics of dragonfly wings is analyzed and its application prospect is depicted.展开更多
Ⅰ. INTRODUCTIONThe observation of domain wall oscillation(DWR) and domain lattice FMR(DR) is one of the most common methods used to study the dynamic behaviors of magnetic domains, especially those in thin films for ...Ⅰ. INTRODUCTIONThe observation of domain wall oscillation(DWR) and domain lattice FMR(DR) is one of the most common methods used to study the dynamic behaviors of magnetic domains, especially those in thin films for magnetic bubble memories, because it yields the significant information about domain wall structure and damping, which are very展开更多
提出一种双偶极子液晶相位控制单元结构,并对液晶相位控制单元的设计与模型仿真进行研究。首先通过对比两种无限大周期结构的仿真结果,确定液晶相位控制单元的仿真方法。基于该仿真方法,分析了双偶极子多谐振结构的电流分布,从而揭示了...提出一种双偶极子液晶相位控制单元结构,并对液晶相位控制单元的设计与模型仿真进行研究。首先通过对比两种无限大周期结构的仿真结果,确定液晶相位控制单元的仿真方法。基于该仿真方法,分析了双偶极子多谐振结构的电流分布,从而揭示了相位控制单元的工作原理。基于该工作原理,一种包括单偶极子单元设计和双偶极子互耦影响的设计优化方法被提出。仿真结果显示,经过优化设计后的液晶反射移相控制单元同时拥有小于-6 d B的低损耗和450°的宽调相范围,可以用于设计可重构天线、有源电磁阻抗表面等。展开更多
基金supported by the National Natural Science Foundation of China (Major Project of International Cooperation) (Grant No.50920105504)the National Natural Science Fundation for Youths (GrantNos. 51005097 and 51205160)+1 种基金the Science and Technology Development Project of Jilin Province (Grant No. 201201025)the Fundamental Science Research Funds for Key Laboratory of Ministry Education (GrantNo. 450060326061)
文摘Dragonfly is one of the most excellent nature flyers,and its wings exhibit excellent functional characteristics through the coupling and synergy of morphology,configuration,structure and material.The functional characteristics presented by dragonfly wings provide an biological inspiration for the investigation and development of aerospace vehicles and bionics flapping aerocraft flapping-wing micro air vehicles.In resent years,some progresses have been achieved in the researches on the wings' geometric structure,material characteristics,flying mechanism and the controlling mode.In this paper,the functional characteristics of the dragonfly wings including flying,self-cleaning,anti-fatigue,vibration elimination and noise reduction are introduced and the effects of their morphology,configuration,structure and material on the functional characteristics are described.Moreover,the current state of the bionic study on the functional characteristics of dragonfly wings is analyzed and its application prospect is depicted.
文摘Ⅰ. INTRODUCTIONThe observation of domain wall oscillation(DWR) and domain lattice FMR(DR) is one of the most common methods used to study the dynamic behaviors of magnetic domains, especially those in thin films for magnetic bubble memories, because it yields the significant information about domain wall structure and damping, which are very
文摘提出一种双偶极子液晶相位控制单元结构,并对液晶相位控制单元的设计与模型仿真进行研究。首先通过对比两种无限大周期结构的仿真结果,确定液晶相位控制单元的仿真方法。基于该仿真方法,分析了双偶极子多谐振结构的电流分布,从而揭示了相位控制单元的工作原理。基于该工作原理,一种包括单偶极子单元设计和双偶极子互耦影响的设计优化方法被提出。仿真结果显示,经过优化设计后的液晶反射移相控制单元同时拥有小于-6 d B的低损耗和450°的宽调相范围,可以用于设计可重构天线、有源电磁阻抗表面等。
