| 1 | Chemical Constituents and Biological Activities of Plants from the genus Ehretia Linn.显示文摘The plants of the genus Ehretia Linn.composed of about 50 species mainly distributed in tropical Asia and Africa.They have been used as folk medicines or traditional tea to treat various ailments in China for a long time.This contribution reviews the chemical constituents isolated from the plants of the genus Ehretia Linn.and related biological activities of these species in the past few decades.The compounds in the genus mainly belong to the classes of phenolic acids,flavonoids,benzoquinones,cyanogenetic glycosides,and fatty acids.The main biological activities include antioxidant,anti-inflammatory,antisnake venom,and anti-allergic activities. | LI Li1,2,PENG Yong1,YAO Xia1,XU Li-jia1,WULAN Ta-na1,LIU Yong2,SHI Ren-bing2,XIAO Pei-gen1 1.Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine(Peking Union Medical College),Ministry of Education,Institute of Medicinal Plant Development,Chinese Academy of Medical Sciences,Beijing 100193,China 2.School of Chinese Materia Medica,Beijing University of Chinese Medicine,Beijing 100102,China | 2010 | Chinese Herbal Medicines2010，2，2： | 2 |
| 2 | Review of tensairity and its applications in agricultural aviation显示文摘In recent years,the unmanned aerial vehicle(UAV)has undergone rapid development in field of agricultural plant protection;however,the payload and max-endurance are bottlenecks that limit its further development.Tensairity is a new structure consisting of a bag filled with low-pressure gas,an upper rigid rod and a lower flexible cable.It puts tension pressure on the whole structure through internal gas pressure,provides continuous support to the upper rigid rod,and that is to say,the tensairity improves the stability of the structure in some way.And also,tensairity is a self-supporting and self-balancing system,which means it is a simple,lightweight structure with small storage volume,strong bearing capacity,and low engineering cost.It also has the advantages of gasbag and BSS(beam string structure).The main objective of this research was to introduce the theoretical basis of tensairity and then discussed its development and applications.Moreover,the advantages and disadvantages of tensairity were summarized,and development prospects of tensairity in agricultural aviation were presented.At last,it can be concluded that tensairity has potentials in agricultural aviation.If tensairity is applied in agricultural UAVs,it will solve the two major problems of payload and max-endurance better,and help promoting the development of agricultural aviation technology in agricultural aviation administration and application.Also,it will help with meeting the aerial application requirements of high efficiency and maximal environmental protection.This research will provide a reference for improving working efficiency and economic benefits of UAVs in agricultural plant protection. | Zang Ying Gu Xiuyan Zhou Zhiyan Luo Xiwen Zang Yu Qi Xingyuan Liu Wulan Yang Cheng | 2016 | International Journal of Agricultural and Biological Engineering2016，9，3： | 0 |
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