Digital technology provides a method of quantitative investigation and data analysis for contemporary landscape spatial analysis,and related research is moving from image recognition to digital algorithmic analysis,pr...Digital technology provides a method of quantitative investigation and data analysis for contemporary landscape spatial analysis,and related research is moving from image recognition to digital algorithmic analysis,providing a more scientific and macroscopic way of research.The key to refinement design is to refine the spatial design process and the spatial improvement strategy system.Taking the ancient city of Zhaoyu in Qixian County,Shanxi Province as an example,(1)based on obtaining the integrated data of the ancient city through the drone tilt photography,the style and landscape of the ancient city are modeled;(2)the point cloud data with spatial information is imported into the point cloud analysis platform and the data analysis is carried out from the overall macroscopic style of the ancient city to the refinement level,which results in the formation of a more intuitive landscape design scheme,thus improving the precision and practicability of the landscape design;(3)Based on spatial big data,it starts from the spatial aggregation level,spatial distribution characteristics and other evaluation index system to achieve the refinement analysis of the site.Digital technology and methods are used throughout the process to explore the refined design path.展开更多
先进天基太阳天文台(Advanced Space-based Solar Observatory,ASO-S)卫星姿控分系统的主要任务是实现高精度、高稳定度对日指向控制.ASO-S卫星的科学载荷中,白光望远镜(White-light Solar Telescope,WST)前端配置了太阳导行镜(Guide Te...先进天基太阳天文台(Advanced Space-based Solar Observatory,ASO-S)卫星姿控分系统的主要任务是实现高精度、高稳定度对日指向控制.ASO-S卫星的科学载荷中,白光望远镜(White-light Solar Telescope,WST)前端配置了太阳导行镜(Guide Telescope,GT)稳像系统,利用正交分布光电二极管组成的边缘探测器测量导行镜光轴与太阳中心的偏差角.提出了一种将GT测量值引入姿态控制闭环的控制方法:利用星敏陀螺定姿算法获得卫星-太阳方向姿态偏差,GT测量值确定非卫星-太阳方向姿态偏差;以4斜装反作用轮组为执行机构,进行三轴零动量稳定姿态控制.通过数学仿真验证,基于GT测量值的姿态控制器在非卫星-太阳方向的绝对指向精度优于2′′、相对姿态稳定度优于1′′/60 s,满足ASO-S卫星高精度高稳定度的对日指向要求.展开更多
The scientific evidenee of acupuncture studies has been improved in recent years,and one of the important manifestations is that more and more acupuncture clinical trials and mechanism researches have been published i...The scientific evidenee of acupuncture studies has been improved in recent years,and one of the important manifestations is that more and more acupuncture clinical trials and mechanism researches have been published in the source periodicals of Science Citation Index(SCI).This study summarized the dominant diseases of acupuncture focusing on of acupuncture efficacy and mechanisms,and discussed the existing problems,highlight!ng the directi on of future developme nts.Most clinical studies were published in journals with journal impact factor(JIF)score of 10 or above,and majority of the basic researches had JIF scores of 5 to 10.The above literature were further divided according to the International Classification of Diseases(ICD).The most concerned diseases in these articles were neurological diseases,musculoskeletal system and connective tissue diseases,tumor and digestive system diseases.The therapeutic effect and mechanism of acupuncture on each kind of disease were summarized.The results showed that the therapeutic effect of acupuncture on nerve injury focused on the anti-oxidation pathway,neuroprotective and anti-inflammatory processes.The antiinflammatory effect also played an important role in the treatme nt of musculoskeletal diseases.The an algesic effect was underlined in most of these studies.Clinical trials were well carried out on acupuncture curative effect of tumor complications and side effects of chemo-radiotherapy,but the potential mechanisms have not been clarified.Somato-visceral reflex was suggested to be strongly associated with the effects of acupuncture changing the motor activity of the gastrointestinal tract.Functional magnetic resonance imaging studies indicated that non-specific effects play important roles in acupuncture analgesia.Lines of evidenee have pointed out that the regulation of neuro-endocrine-immune networks may be a common switch of acupuncture on different nerve system diseases.展开更多
文摘Digital technology provides a method of quantitative investigation and data analysis for contemporary landscape spatial analysis,and related research is moving from image recognition to digital algorithmic analysis,providing a more scientific and macroscopic way of research.The key to refinement design is to refine the spatial design process and the spatial improvement strategy system.Taking the ancient city of Zhaoyu in Qixian County,Shanxi Province as an example,(1)based on obtaining the integrated data of the ancient city through the drone tilt photography,the style and landscape of the ancient city are modeled;(2)the point cloud data with spatial information is imported into the point cloud analysis platform and the data analysis is carried out from the overall macroscopic style of the ancient city to the refinement level,which results in the formation of a more intuitive landscape design scheme,thus improving the precision and practicability of the landscape design;(3)Based on spatial big data,it starts from the spatial aggregation level,spatial distribution characteristics and other evaluation index system to achieve the refinement analysis of the site.Digital technology and methods are used throughout the process to explore the refined design path.
文摘先进天基太阳天文台(Advanced Space-based Solar Observatory,ASO-S)卫星姿控分系统的主要任务是实现高精度、高稳定度对日指向控制.ASO-S卫星的科学载荷中,白光望远镜(White-light Solar Telescope,WST)前端配置了太阳导行镜(Guide Telescope,GT)稳像系统,利用正交分布光电二极管组成的边缘探测器测量导行镜光轴与太阳中心的偏差角.提出了一种将GT测量值引入姿态控制闭环的控制方法:利用星敏陀螺定姿算法获得卫星-太阳方向姿态偏差,GT测量值确定非卫星-太阳方向姿态偏差;以4斜装反作用轮组为执行机构,进行三轴零动量稳定姿态控制.通过数学仿真验证,基于GT测量值的姿态控制器在非卫星-太阳方向的绝对指向精度优于2′′、相对姿态稳定度优于1′′/60 s,满足ASO-S卫星高精度高稳定度的对日指向要求.
基金the National Natural Science Foundation of China(Nos.81704146,81503637 and 81503636)the Natural Science Foundation of Tianjin(No.16JCYBJC43500)。
文摘The scientific evidenee of acupuncture studies has been improved in recent years,and one of the important manifestations is that more and more acupuncture clinical trials and mechanism researches have been published in the source periodicals of Science Citation Index(SCI).This study summarized the dominant diseases of acupuncture focusing on of acupuncture efficacy and mechanisms,and discussed the existing problems,highlight!ng the directi on of future developme nts.Most clinical studies were published in journals with journal impact factor(JIF)score of 10 or above,and majority of the basic researches had JIF scores of 5 to 10.The above literature were further divided according to the International Classification of Diseases(ICD).The most concerned diseases in these articles were neurological diseases,musculoskeletal system and connective tissue diseases,tumor and digestive system diseases.The therapeutic effect and mechanism of acupuncture on each kind of disease were summarized.The results showed that the therapeutic effect of acupuncture on nerve injury focused on the anti-oxidation pathway,neuroprotective and anti-inflammatory processes.The antiinflammatory effect also played an important role in the treatme nt of musculoskeletal diseases.The an algesic effect was underlined in most of these studies.Clinical trials were well carried out on acupuncture curative effect of tumor complications and side effects of chemo-radiotherapy,but the potential mechanisms have not been clarified.Somato-visceral reflex was suggested to be strongly associated with the effects of acupuncture changing the motor activity of the gastrointestinal tract.Functional magnetic resonance imaging studies indicated that non-specific effects play important roles in acupuncture analgesia.Lines of evidenee have pointed out that the regulation of neuro-endocrine-immune networks may be a common switch of acupuncture on different nerve system diseases.
