Downward continuation is a key step in processing airborne geomagnetic data. However,downward continuation is a typically ill-posed problem because its computation is unstable; thus, regularization methods are needed ...Downward continuation is a key step in processing airborne geomagnetic data. However,downward continuation is a typically ill-posed problem because its computation is unstable; thus, regularization methods are needed to realize effective continuation. According to the Poisson integral plane approximate relationship between observation and continuation data, the computation formulae combined with the fast Fourier transform（FFT）algorithm are transformed to a frequency domain for accelerating the computational speed. The iterative Tikhonov regularization method and the iterative Landweber regularization method are used in this paper to overcome instability and improve the precision of the results. The availability of these two iterative regularization methods in the frequency domain is validated by simulated geomagnetic data, and the continuation results show good precision.展开更多
Downward surface net radiation,the net energy of the earth's surface obtained through shortwave and longwave radiation process,is the main driving force for material and energy cycle in the whole earth system.In t...Downward surface net radiation,the net energy of the earth's surface obtained through shortwave and longwave radiation process,is the main driving force for material and energy cycle in the whole earth system.In this study,the main research results of monitoring methods of downward surface net radiation at home and abroad in recent decades have been summarized,and main remote sensing radiation products produced according to various sensors have been introduced.Moreover,the monitoring methods of downward shortwave and long-wave radiation have been discussed,and their principles,advantages and disadvantages have been analyzed to provide scientific references for further study of downward surface solar net radiation in future.展开更多
针对低温多晶硅/有机发光二极管(Low Temperature Poly-Silicon/Organic Light-Emitting Diode,LTPS/OLED)玻璃基板厚度偏差控制难题,笔者研究了溢流下拉法中熔融玻璃性能、溢流砖结构、温度场及拉引工艺对厚度均匀性的影响机制,提出了...针对低温多晶硅/有机发光二极管(Low Temperature Poly-Silicon/Organic Light-Emitting Diode,LTPS/OLED)玻璃基板厚度偏差控制难题,笔者研究了溢流下拉法中熔融玻璃性能、溢流砖结构、温度场及拉引工艺对厚度均匀性的影响机制,提出了熔体性能调控、溢流砖结构优化、温度场精密控制及拉引稳定性强化的集成方案。中试结果显示:优化后玻璃基板厚度标准差由2.8μm降至0.9μm,最大厚度偏差降至±2.0μm以内,过程能力指数C_(PK)达1.58,为超低厚度偏差显示玻璃制造提供技术范式,推动国产高端基板自主化。展开更多
The existing methods of downward continuation of potential field cannot be used to continue the aeromagnetic data to the marine surface because of the limited continuation distance. An iteration method for the downwar...The existing methods of downward continuation of potential field cannot be used to continue the aeromagnetic data to the marine surface because of the limited continuation distance. An iteration method for the downward continuation of potential field with a much larger continuation distance has been developed, which can continue the aeromagnetic data to the marine surface and get the marine - magnetic chart with the same scale as the aeromagnetic data. This downward continuation method will greatly raise the ef- ficiency of marine - magnetic investigation. The principle of the iteration method is presented. The method is demonstrated on synthetic models and real aeromagnetic data. Also, the error brought by continuation is discussed. The efficiency of the iteration method for the downward continuation of potential field is compared with the fast fourier transform （FFT） method, the former is much better than the latter.展开更多
基金supported by the National Natural Science Foundation of China(41304022,41174026,41104047)the National 973 Foundation(61322201,2013CB733303)+1 种基金the Key laboratory Foundation of Geo-space Environment and Geodesy of the Ministry of Education(13-01-08)the Youth Innovation Foundation of High Resolution Earth Observation(GFZX04060103-5-12)
文摘Downward continuation is a key step in processing airborne geomagnetic data. However,downward continuation is a typically ill-posed problem because its computation is unstable; thus, regularization methods are needed to realize effective continuation. According to the Poisson integral plane approximate relationship between observation and continuation data, the computation formulae combined with the fast Fourier transform（FFT）algorithm are transformed to a frequency domain for accelerating the computational speed. The iterative Tikhonov regularization method and the iterative Landweber regularization method are used in this paper to overcome instability and improve the precision of the results. The availability of these two iterative regularization methods in the frequency domain is validated by simulated geomagnetic data, and the continuation results show good precision.
基金Sponsored by Applied Basic Research Project for Young Scholars of Shihezi University(2015ZRKXYQ06)International Cooperation and Exchange Protect of China(2015DFA11660)
文摘Downward surface net radiation,the net energy of the earth's surface obtained through shortwave and longwave radiation process,is the main driving force for material and energy cycle in the whole earth system.In this study,the main research results of monitoring methods of downward surface net radiation at home and abroad in recent decades have been summarized,and main remote sensing radiation products produced according to various sensors have been introduced.Moreover,the monitoring methods of downward shortwave and long-wave radiation have been discussed,and their principles,advantages and disadvantages have been analyzed to provide scientific references for further study of downward surface solar net radiation in future.
文摘针对低温多晶硅/有机发光二极管(Low Temperature Poly-Silicon/Organic Light-Emitting Diode,LTPS/OLED)玻璃基板厚度偏差控制难题,笔者研究了溢流下拉法中熔融玻璃性能、溢流砖结构、温度场及拉引工艺对厚度均匀性的影响机制,提出了熔体性能调控、溢流砖结构优化、温度场精密控制及拉引稳定性强化的集成方案。中试结果显示:优化后玻璃基板厚度标准差由2.8μm降至0.9μm,最大厚度偏差降至±2.0μm以内,过程能力指数C_(PK)达1.58,为超低厚度偏差显示玻璃制造提供技术范式,推动国产高端基板自主化。
基金The National Natural Science Foundation of China under contract No.40644022the China Post-doctor Science Foundation under contract No.20050335090.
文摘The existing methods of downward continuation of potential field cannot be used to continue the aeromagnetic data to the marine surface because of the limited continuation distance. An iteration method for the downward continuation of potential field with a much larger continuation distance has been developed, which can continue the aeromagnetic data to the marine surface and get the marine - magnetic chart with the same scale as the aeromagnetic data. This downward continuation method will greatly raise the ef- ficiency of marine - magnetic investigation. The principle of the iteration method is presented. The method is demonstrated on synthetic models and real aeromagnetic data. Also, the error brought by continuation is discussed. The efficiency of the iteration method for the downward continuation of potential field is compared with the fast fourier transform （FFT） method, the former is much better than the latter.
