Tobacco black shank is one of the devastating diseases of tobacco. In recent years, this disease widely occurred in most tobacco-growing areas, which caused disastrous losses and has severely threatened the sustainabl...Tobacco black shank is one of the devastating diseases of tobacco. In recent years, this disease widely occurred in most tobacco-growing areas, which caused disastrous losses and has severely threatened the sustainable development of flue-cured tobacco. In order to lay a theoretical foundation for the better control of tobacco black shank, the occurrence characteristics and integrated control strategis of this disease were systematically discussed according to the aspects of agricultural control, chemical control, biological control, etc.展开更多
On the basis of reviewing the development history of drilling engineering technology over a century, this paper describes the technical and scientific background of downhole control engineering, discusses its basic is...On the basis of reviewing the development history of drilling engineering technology over a century, this paper describes the technical and scientific background of downhole control engineering, discusses its basic issues, discipline frame and main study contents, introduces the research progress of downhole control engineering in China over the past 30 years, and envisions the development direction of downhole control engineering in the future. The author proposed the study subject of well trajectory control theory and technology in 1988, and further proposed the concept of downhole control engineering in 1993. Downhole control engineering is a discipline branch, which applies the perspectives and methods of engineering control theory to solve downhole engineering control issues in oil and gas wells; meanwhile, it is an application technology field with interdisciplinarity. Downhole control engineering consists of four main aspects; primarily, investigations about dynamics of downhole system and analysis methods of control signals; secondly, designs of downhole control mechanisms and systems, research of downhole parameters collections and transmission techniques; thirdly, development of downhole control engineering products; fourthly, development of experimental methods and the laboratories. Over the past 30 years, the author and his research group have achieved a number of progress and accomplishments in the four aspects mentioned above. As a research field and a disciplinary branch of oil and gas engineering, downhole control engineering is stepping into a broader and deeper horizon.展开更多
软着陆探测是重要的地外天体探测方式,制导、导航与控制(Guidance,Navigation and Control,GNC)是地外天体软着陆成功的关键。首先梳理了国内外月球、火星和小天体等地外天体软着陆任务发展现状;在此基础上,总结了地外天体软着陆任务典...软着陆探测是重要的地外天体探测方式,制导、导航与控制(Guidance,Navigation and Control,GNC)是地外天体软着陆成功的关键。首先梳理了国内外月球、火星和小天体等地外天体软着陆任务发展现状;在此基础上,总结了地外天体软着陆任务典型GNC方案及自主导航与控制技术主要进展;最后,针对未来的地外天体精确定点软着陆任务,提出了需要重点关注和发展的自主导航与控制关键技术,为未来技术发展提供借鉴和参考。展开更多
莱姆病(Lyme disease)又名伯氏疏螺旋体病,是20世纪70年代发现的以蜱为传播媒介,由不同基因型伯氏疏螺旋体(Borrelia burgdorferi sensu lato)感染所致的人兽共患自然疫源性疾病,主要流行于温带和亚热带地区,犬、猫、马、牛、鹿等多种...莱姆病(Lyme disease)又名伯氏疏螺旋体病,是20世纪70年代发现的以蜱为传播媒介,由不同基因型伯氏疏螺旋体(Borrelia burgdorferi sensu lato)感染所致的人兽共患自然疫源性疾病,主要流行于温带和亚热带地区,犬、猫、马、牛、鹿等多种动物易感,人也是该病原菌的易感宿主。人患莱姆病时的主要症状为游走性红斑、关节炎和其他神经系统症状。患病动物常表现的症状是蜱叮咬部位被毛脱落、发热、蹄叶炎、跛行等。莱姆病流行广泛,但是诊断较为困难并极易造成误诊和漏诊。为避免莱姆病对畜牧业以及宠物行业造成不利影响,亟需提高对莱姆病的关注。因此,本文对动物莱姆病及其诊断和防治技术的研究进展进行综述,以期为动物莱姆病的准确、快速诊断和防治提供参考。展开更多
基金Supported by Project of Yunnan Tobacco Company of Science and Technology(2014YN20)
文摘Tobacco black shank is one of the devastating diseases of tobacco. In recent years, this disease widely occurred in most tobacco-growing areas, which caused disastrous losses and has severely threatened the sustainable development of flue-cured tobacco. In order to lay a theoretical foundation for the better control of tobacco black shank, the occurrence characteristics and integrated control strategis of this disease were systematically discussed according to the aspects of agricultural control, chemical control, biological control, etc.
文摘On the basis of reviewing the development history of drilling engineering technology over a century, this paper describes the technical and scientific background of downhole control engineering, discusses its basic issues, discipline frame and main study contents, introduces the research progress of downhole control engineering in China over the past 30 years, and envisions the development direction of downhole control engineering in the future. The author proposed the study subject of well trajectory control theory and technology in 1988, and further proposed the concept of downhole control engineering in 1993. Downhole control engineering is a discipline branch, which applies the perspectives and methods of engineering control theory to solve downhole engineering control issues in oil and gas wells; meanwhile, it is an application technology field with interdisciplinarity. Downhole control engineering consists of four main aspects; primarily, investigations about dynamics of downhole system and analysis methods of control signals; secondly, designs of downhole control mechanisms and systems, research of downhole parameters collections and transmission techniques; thirdly, development of downhole control engineering products; fourthly, development of experimental methods and the laboratories. Over the past 30 years, the author and his research group have achieved a number of progress and accomplishments in the four aspects mentioned above. As a research field and a disciplinary branch of oil and gas engineering, downhole control engineering is stepping into a broader and deeper horizon.
文摘软着陆探测是重要的地外天体探测方式,制导、导航与控制(Guidance,Navigation and Control,GNC)是地外天体软着陆成功的关键。首先梳理了国内外月球、火星和小天体等地外天体软着陆任务发展现状;在此基础上,总结了地外天体软着陆任务典型GNC方案及自主导航与控制技术主要进展;最后,针对未来的地外天体精确定点软着陆任务,提出了需要重点关注和发展的自主导航与控制关键技术,为未来技术发展提供借鉴和参考。
文摘莱姆病(Lyme disease)又名伯氏疏螺旋体病,是20世纪70年代发现的以蜱为传播媒介,由不同基因型伯氏疏螺旋体(Borrelia burgdorferi sensu lato)感染所致的人兽共患自然疫源性疾病,主要流行于温带和亚热带地区,犬、猫、马、牛、鹿等多种动物易感,人也是该病原菌的易感宿主。人患莱姆病时的主要症状为游走性红斑、关节炎和其他神经系统症状。患病动物常表现的症状是蜱叮咬部位被毛脱落、发热、蹄叶炎、跛行等。莱姆病流行广泛,但是诊断较为困难并极易造成误诊和漏诊。为避免莱姆病对畜牧业以及宠物行业造成不利影响,亟需提高对莱姆病的关注。因此,本文对动物莱姆病及其诊断和防治技术的研究进展进行综述,以期为动物莱姆病的准确、快速诊断和防治提供参考。
