In this article,we present a detailed analysis of the statistical properties of seeing for the Muztaghata site which is a candidate site for hosting the future Chinese Large Optical/infrared Telescope(LOT)project.The ...In this article,we present a detailed analysis of the statistical properties of seeing for the Muztaghata site which is a candidate site for hosting the future Chinese Large Optical/infrared Telescope(LOT)project.The measurements were obtained with differential image motion monitors(DIMMs)from April2017 to November 2018 at different heights during different periods.The median seeings at 11 m and6 m are very close but significantly different from that on the ground.We mainly analyzed the seeing at11 m monthly and hourly,having found that the best season for observing was from late autumn to early winter and seeing tended to improve during the night only in autumn.The analysis of the dependence on temperature inversion,wind speed and direction also was made and the best meteorological conditions for seeing are given.展开更多
The Seeing observation at Gaomeigu station, Lijiang, Yunnan during March, 1995—December, 1996 is introduced in this paper, On the average Fried parameter is equal to 15 34cm (FWHM=0 72″). In the same time, the seein...The Seeing observation at Gaomeigu station, Lijiang, Yunnan during March, 1995—December, 1996 is introduced in this paper, On the average Fried parameter is equal to 15 34cm (FWHM=0 72″). In the same time, the seeing observation in the 46 nights that the observation time was more than five hours is introduced. On the average Fried parameter is r 0=16 5cm (FWHM=0 67″). For the best seeing on an average r 0=22 36cm (FWHM=0 49″). The mininum on an average is r 0=12 95cm (FWHM=0 85″).展开更多
“Kan”and“Jian”are both sense verbs in Chinese,but they can develop into multiple meanings and usage.In order to prove that the language in communication assumes the collective cultural experience and historical ba...“Kan”and“Jian”are both sense verbs in Chinese,but they can develop into multiple meanings and usage.In order to prove that the language in communication assumes the collective cultural experience and historical background,this article attempts,from the connection and differentiation between various meanings,to sort out how the semantic structure is defined in accordance with the situations where the words are used.In addition,based on the methods of the diachronic research and synchronic research,this article also observes the semantic evolution and the extensive concepts of imitation and implication.展开更多
China is the manufacturing hub of the world,and its huge mar-ket demands have contributed to the large inflow of foreign capital.As the Chinese economy has entered the"new normal",the market has seen both an...China is the manufacturing hub of the world,and its huge mar-ket demands have contributed to the large inflow of foreign capital.As the Chinese economy has entered the"new normal",the market has seen both an inflow and exodus of foreign capital.Is the exodus of foreign capital from China really under way?Foreign capital needs to fit the"new normal"Data from the Ministry of Com-merce shows that during January-Octo-展开更多
Strong atmospheric turbulence reduces astronomical seeing,causing speckle images acquired by ground-based solar telescopes to become blurred and distorted.Severe distortion in speckle images impedes image phase deviat...Strong atmospheric turbulence reduces astronomical seeing,causing speckle images acquired by ground-based solar telescopes to become blurred and distorted.Severe distortion in speckle images impedes image phase deviation in the speckle masking reconstruction method,leading to the appearance of spurious imaging artifacts.Relying only on linear image degradation principles to reconstruct solar images is insufficient.To solve this problem,we propose the multiframe blind deconvolution combined with non-rigid alignment(MFBD-CNRA)method for solar image reconstruction.We consider image distortion caused by atmospheric turbulence and use non-rigid alignment to correct pixel-level distortion,thereby achieving nonlinear constraints to complement image intensity changes.After creating the corrected speckle image,we use the linear method to solve the wavefront phase,obtaining the target image.We verify the effectiveness of our method results,compared with others,using solar observation data from the 1 m new vacuum solar telescope(NVST).This new method successfully reconstructs high-resolution images of solar observations with a Fried parameter r0 of approximately 10 cm,and enhances images at high frequency.When r0 is approximately 5 cm,the new method is even more effective.It reconstructs the edges of solar graining and sunspots,and is greatly enhanced at mid and high frequency compared with other methods.Comparisons confirm the effectiveness of this method,with respect to both nonlinear and linear constraints in solar image reconstruction.This provides a suitable solution for image reconstruction in ground-based solar observations under strong atmospheric turbulence.展开更多
Senior Chinese Tibetologist invites Americans to see the real Tibet for themselves Slavery,a bitter period in American history,ended more than a centu- ry ago in the United States,while for many Americans,its legacy i...Senior Chinese Tibetologist invites Americans to see the real Tibet for themselves Slavery,a bitter period in American history,ended more than a centu- ry ago in the United States,while for many Americans,its legacy is still felt today like a wound that展开更多
Following the successful launch of the Chang ’e-1 satellite in 2007, Chang ’e-2 was lifted off by a Long March 3 carrier rocket on October 1, marking the beginning of the second phase of China’s lunar probe project.
With any luck,the future will bring more self-driving cars and flying drones to deliver pizza and other goodies.For those robots to get around safely,though,they need to both see their surroundings and understand what...With any luck,the future will bring more self-driving cars and flying drones to deliver pizza and other goodies.For those robots to get around safely,though,they need to both see their surroundings and understand what they're seeing.A new kind of camera developed by(A)e________in California may help them do just that.It sees more than what meets our eyes.展开更多
MS. Kallistratos, a young journalist from Greece, raised her video recorder to record the solemn occasion when the military band struck up the strains of the national anthem of the People’s Republic of China. Kallist...MS. Kallistratos, a young journalist from Greece, raised her video recorder to record the solemn occasion when the military band struck up the strains of the national anthem of the People’s Republic of China. Kallistratos was at the reception for foreign experts in celebration of China’s 45th National Day held in the garden of the Beijing Friendship Hotel. Behind Ms. Kallistratos stood展开更多
基金supported by theNational Nature Science Foundation of China(Grant Nos.11873081 and 11603065)the Operation,Maintenance and Upgrading Fund for Astronomical Telescopes and Facility Instruments,budgeted from the Ministry of Finance of China(MOF)and administered by the Chinese Academy of Sciences。
文摘In this article,we present a detailed analysis of the statistical properties of seeing for the Muztaghata site which is a candidate site for hosting the future Chinese Large Optical/infrared Telescope(LOT)project.The measurements were obtained with differential image motion monitors(DIMMs)from April2017 to November 2018 at different heights during different periods.The median seeings at 11 m and6 m are very close but significantly different from that on the ground.We mainly analyzed the seeing at11 m monthly and hourly,having found that the best season for observing was from late autumn to early winter and seeing tended to improve during the night only in autumn.The analysis of the dependence on temperature inversion,wind speed and direction also was made and the best meteorological conditions for seeing are given.
文摘The Seeing observation at Gaomeigu station, Lijiang, Yunnan during March, 1995—December, 1996 is introduced in this paper, On the average Fried parameter is equal to 15 34cm (FWHM=0 72″). In the same time, the seeing observation in the 46 nights that the observation time was more than five hours is introduced. On the average Fried parameter is r 0=16 5cm (FWHM=0 67″). For the best seeing on an average r 0=22 36cm (FWHM=0 49″). The mininum on an average is r 0=12 95cm (FWHM=0 85″).
文摘“Kan”and“Jian”are both sense verbs in Chinese,but they can develop into multiple meanings and usage.In order to prove that the language in communication assumes the collective cultural experience and historical background,this article attempts,from the connection and differentiation between various meanings,to sort out how the semantic structure is defined in accordance with the situations where the words are used.In addition,based on the methods of the diachronic research and synchronic research,this article also observes the semantic evolution and the extensive concepts of imitation and implication.
文摘China is the manufacturing hub of the world,and its huge mar-ket demands have contributed to the large inflow of foreign capital.As the Chinese economy has entered the"new normal",the market has seen both an inflow and exodus of foreign capital.Is the exodus of foreign capital from China really under way?Foreign capital needs to fit the"new normal"Data from the Ministry of Com-merce shows that during January-Octo-
基金sponsored by the National Natural Science Foundation of China(NSFC)under the grant numbers(11773073,11873027,U2031140,11833010)Yunnan Key Laboratory of Solar Physics and Space Science under the number 202205AG070009+1 种基金Yunnan Provincial Science and Technology Department(202103AD50013,202105AB160001,202305AH340002)the GHfund A202302013242 and CAS“Light of West China”Program 202305AS350029.
文摘Strong atmospheric turbulence reduces astronomical seeing,causing speckle images acquired by ground-based solar telescopes to become blurred and distorted.Severe distortion in speckle images impedes image phase deviation in the speckle masking reconstruction method,leading to the appearance of spurious imaging artifacts.Relying only on linear image degradation principles to reconstruct solar images is insufficient.To solve this problem,we propose the multiframe blind deconvolution combined with non-rigid alignment(MFBD-CNRA)method for solar image reconstruction.We consider image distortion caused by atmospheric turbulence and use non-rigid alignment to correct pixel-level distortion,thereby achieving nonlinear constraints to complement image intensity changes.After creating the corrected speckle image,we use the linear method to solve the wavefront phase,obtaining the target image.We verify the effectiveness of our method results,compared with others,using solar observation data from the 1 m new vacuum solar telescope(NVST).This new method successfully reconstructs high-resolution images of solar observations with a Fried parameter r0 of approximately 10 cm,and enhances images at high frequency.When r0 is approximately 5 cm,the new method is even more effective.It reconstructs the edges of solar graining and sunspots,and is greatly enhanced at mid and high frequency compared with other methods.Comparisons confirm the effectiveness of this method,with respect to both nonlinear and linear constraints in solar image reconstruction.This provides a suitable solution for image reconstruction in ground-based solar observations under strong atmospheric turbulence.
文摘Senior Chinese Tibetologist invites Americans to see the real Tibet for themselves Slavery,a bitter period in American history,ended more than a centu- ry ago in the United States,while for many Americans,its legacy is still felt today like a wound that
文摘Following the successful launch of the Chang ’e-1 satellite in 2007, Chang ’e-2 was lifted off by a Long March 3 carrier rocket on October 1, marking the beginning of the second phase of China’s lunar probe project.
文摘With any luck,the future will bring more self-driving cars and flying drones to deliver pizza and other goodies.For those robots to get around safely,though,they need to both see their surroundings and understand what they're seeing.A new kind of camera developed by(A)e________in California may help them do just that.It sees more than what meets our eyes.
文摘MS. Kallistratos, a young journalist from Greece, raised her video recorder to record the solemn occasion when the military band struck up the strains of the national anthem of the People’s Republic of China. Kallistratos was at the reception for foreign experts in celebration of China’s 45th National Day held in the garden of the Beijing Friendship Hotel. Behind Ms. Kallistratos stood
