An improvement detecting method was proposed according to the disadvantages of testing method of optical axes parallelism of shipboard photoelectrical theodolite (short for theodolite) based on image processing. Point...An improvement detecting method was proposed according to the disadvantages of testing method of optical axes parallelism of shipboard photoelectrical theodolite (short for theodolite) based on image processing. Pointolite replaced 0.2'' collimator to reduce the errors of crosshair images processing and improve the quality of image. What’s more, the high quality images could help to optimize the image processing method and the testing accuracy. The errors between the trial results interpreted by software and the results tested in dock were less than 10'', which indicated the improve method had some actual application values.展开更多
Based on the 155 years global monthly mean sea surface pressure data （Jan. 1850-Dec. 2004） from Hadley Centre, the time spatial change and sudden characteristics of the Winter Mongolia High are studied. First, the w...Based on the 155 years global monthly mean sea surface pressure data （Jan. 1850-Dec. 2004） from Hadley Centre, the time spatial change and sudden characteristics of the Winter Mongolia High are studied. First, the winter SLP distribution in Asia and the North Pacific are analyzed by the EOF method. Second, main cycle sequences of the Winter Mongolia High are reconstructed by the Singular Spectrum Analysis method, with special emphasis on the interdecadal periodic changes. Finally, the abrupt climate change is examined by the Mann-Kendall method. Results show that the Winter Mongolia High has quasi-biennial oscillation and a 3-4-year cycle of interannual change, also has a decadal variation for the 13-14-year cycle and interdecadal cycles for 20-21 years and 35-36 years. The 20-21-year cycle of WMHI is of the opposite phase to Aleutian Low, while the 35-36-year cycle is of the same phase. Otherwise, a significant abrupt climate change point in 1927 has been detected.展开更多
文摘An improvement detecting method was proposed according to the disadvantages of testing method of optical axes parallelism of shipboard photoelectrical theodolite (short for theodolite) based on image processing. Pointolite replaced 0.2'' collimator to reduce the errors of crosshair images processing and improve the quality of image. What’s more, the high quality images could help to optimize the image processing method and the testing accuracy. The errors between the trial results interpreted by software and the results tested in dock were less than 10'', which indicated the improve method had some actual application values.
基金supported by the National 973 project (No.2007CB411805)partly supported by the Lab for Applied Geophysics at Institute of Meteorology, PLA University of Science and Technology
文摘Based on the 155 years global monthly mean sea surface pressure data （Jan. 1850-Dec. 2004） from Hadley Centre, the time spatial change and sudden characteristics of the Winter Mongolia High are studied. First, the winter SLP distribution in Asia and the North Pacific are analyzed by the EOF method. Second, main cycle sequences of the Winter Mongolia High are reconstructed by the Singular Spectrum Analysis method, with special emphasis on the interdecadal periodic changes. Finally, the abrupt climate change is examined by the Mann-Kendall method. Results show that the Winter Mongolia High has quasi-biennial oscillation and a 3-4-year cycle of interannual change, also has a decadal variation for the 13-14-year cycle and interdecadal cycles for 20-21 years and 35-36 years. The 20-21-year cycle of WMHI is of the opposite phase to Aleutian Low, while the 35-36-year cycle is of the same phase. Otherwise, a significant abrupt climate change point in 1927 has been detected.
