Bioinspired flapping-wing micro-air-vehicles(FWMAVs)have the potential to be useful aerial tools for gathering information in various environments.With recent advancements in manufacturing technologies and better unde...Bioinspired flapping-wing micro-air-vehicles(FWMAVs)have the potential to be useful aerial tools for gathering information in various environments.With recent advancements in manufacturing technologies and better understanding of aerodynamic mechanisms behind of the flapping flight,outdoor flights have become a reality.However,to fully realize the potential of FWMAVs,further improvements are necessary,particularly in terms of stability and robustness under gusty conditions.In this study,the response and control of a tailless two-winged FWMAV under the wind gusts are investigated.Physical experiments are conducted with a one-degree-of-freedom gimbal to focus on effects of wind gusts on the rotational motion of the FWMAV.Proportional-derivative and sliding-mode controls are adopted for the attitude control.Results present that the body angles changed in time and reached approximately 50°at the maximum due to the wing gusts.The sliding-mode controller can more effectively control the rotational angle in the presence of disturbances and both the wing speed and changes in wind speed have an impact on the effectiveness of attitude control.These results contribute to the development of of tailless two-winged,single-motor driven FWMAVs in terms of the design of attitude controller and testing apparatus.展开更多
The eradication of poliomyelitis is a landmark achievement in the history of public health, providing strong protection for children’s health. The introduction of the Chinese Regulations for the Manufacture and Contr...The eradication of poliomyelitis is a landmark achievement in the history of public health, providing strong protection for children’s health. The introduction of the Chinese Regulations for the Manufacture and Control of Live Poliovirus Vaccine is a prerequisite and safeguard for the large-scale production and use of domestically produced live poliovirus vaccines, serving as an indispensable component of vaccine safety. This article, based on archival documents, letters, collections of essays, and oral interviews, examines the historical experience of the development of Chinese Regulations for the Manufacture and Control of Live Poliovirus Vaccine. It contends that the emphasis on localization and the active engagement in international cooperation are critical factors in the swift introduction of Chinese Regulations for the Manufacture and Control of Live Poliovirus Vaccine.展开更多
为了监测钙调素 (Ca M)在植物细胞内的分布并探索其生物学功能 ,将水稻 Ca M和 GU S融合基因 (cam.gus)分别置于 35 S启动子和花粉特异启动子 L AT5 2 - 7控制下 ,构建出载体 p MD/ Ca M.GU S和 p BI/ L AT.Ca M.GU S,转化烟草 (N icoti...为了监测钙调素 (Ca M)在植物细胞内的分布并探索其生物学功能 ,将水稻 Ca M和 GU S融合基因 (cam.gus)分别置于 35 S启动子和花粉特异启动子 L AT5 2 - 7控制下 ,构建出载体 p MD/ Ca M.GU S和 p BI/ L AT.Ca M.GU S,转化烟草 (N icotiana tobacum cv.SR ) ,GU S染色结果显示 ,Ca M.GU S融合蛋白广泛分布于植物根、茎、叶等组织 ,根尖生长点细胞、根毛细胞、表皮毛细胞、气孔保卫细胞、维管束细胞的细胞质中融合蛋白含量较多。花粉粒中也分布着 Ca M,并在萌发沟处表现出较高的浓度。保卫细胞和表皮毛细胞中 Ca M分布在相邻细胞连接处细胞模内侧 ,呈现出极性分布。研究结果表明 ,细胞内 Ca M的不均匀分布可能与细胞功能相关。展开更多
基金supported by Japan Society for the Promotion of Science KAKENHI under Grant No.JP22H01397supported by the National Science Foundation under Grant No.CMMI-1761618.
文摘Bioinspired flapping-wing micro-air-vehicles(FWMAVs)have the potential to be useful aerial tools for gathering information in various environments.With recent advancements in manufacturing technologies and better understanding of aerodynamic mechanisms behind of the flapping flight,outdoor flights have become a reality.However,to fully realize the potential of FWMAVs,further improvements are necessary,particularly in terms of stability and robustness under gusty conditions.In this study,the response and control of a tailless two-winged FWMAV under the wind gusts are investigated.Physical experiments are conducted with a one-degree-of-freedom gimbal to focus on effects of wind gusts on the rotational motion of the FWMAV.Proportional-derivative and sliding-mode controls are adopted for the attitude control.Results present that the body angles changed in time and reached approximately 50°at the maximum due to the wing gusts.The sliding-mode controller can more effectively control the rotational angle in the presence of disturbances and both the wing speed and changes in wind speed have an impact on the effectiveness of attitude control.These results contribute to the development of of tailless two-winged,single-motor driven FWMAVs in terms of the design of attitude controller and testing apparatus.
基金This work was supported by a key project of the 14th Five Year Plan of the Institute for the History of Natural Sciences,Chinese Academy of Sciences(E2291J01)the Youth Promotion Association of the Chinese Academy of Sciences(E3292G02).
文摘The eradication of poliomyelitis is a landmark achievement in the history of public health, providing strong protection for children’s health. The introduction of the Chinese Regulations for the Manufacture and Control of Live Poliovirus Vaccine is a prerequisite and safeguard for the large-scale production and use of domestically produced live poliovirus vaccines, serving as an indispensable component of vaccine safety. This article, based on archival documents, letters, collections of essays, and oral interviews, examines the historical experience of the development of Chinese Regulations for the Manufacture and Control of Live Poliovirus Vaccine. It contends that the emphasis on localization and the active engagement in international cooperation are critical factors in the swift introduction of Chinese Regulations for the Manufacture and Control of Live Poliovirus Vaccine.
文摘为了监测钙调素 (Ca M)在植物细胞内的分布并探索其生物学功能 ,将水稻 Ca M和 GU S融合基因 (cam.gus)分别置于 35 S启动子和花粉特异启动子 L AT5 2 - 7控制下 ,构建出载体 p MD/ Ca M.GU S和 p BI/ L AT.Ca M.GU S,转化烟草 (N icotiana tobacum cv.SR ) ,GU S染色结果显示 ,Ca M.GU S融合蛋白广泛分布于植物根、茎、叶等组织 ,根尖生长点细胞、根毛细胞、表皮毛细胞、气孔保卫细胞、维管束细胞的细胞质中融合蛋白含量较多。花粉粒中也分布着 Ca M,并在萌发沟处表现出较高的浓度。保卫细胞和表皮毛细胞中 Ca M分布在相邻细胞连接处细胞模内侧 ,呈现出极性分布。研究结果表明 ,细胞内 Ca M的不均匀分布可能与细胞功能相关。
