The origin and spatial-temporal variation of the Earth’s magnetic field(EMF)is one of the important scientific problems that has long been unsolved.The Macao Science Satellite-1(MSS-1)under construction is China’s f...The origin and spatial-temporal variation of the Earth’s magnetic field(EMF)is one of the important scientific problems that has long been unsolved.The Macao Science Satellite-1(MSS-1)under construction is China’s first high-precision EMF measurement satellite.To satisfy the highly precise requirements of the MSS-1 orbit measurement,a light,high-precision,four-prism laser retroreflector array was designed.It weighs approximately 285 g,its effective reflection area is greater than 1.77 cm^(2),and its size is 100×100×41 mm.The laser retro-reflector array has excellent performance,and it can achieve a ranging precision at the subcentimeter level for satellite laser ranging.It will be developed and installed on the MSS-1 as a power-free load for high-precision orbit measurement and accurate orbit calibration.The MSS-1 is planned to be brought into the International Laser Ranging Service observations.More than 31satellite laser ranging stations in the International Laser Ranging Service around the world will be able to measure the MSS-1 with long arcs,which will support the scientific mission of high-precision EMF exploration.展开更多
The value-added output of new industries,new types of business and new business models accounted for 15.7% of China’s GDP last year,up 0.4% from2016,the National Bureau of Statistics(NBS)said recently.
Macao registered a trade deficit of 23.26 billion patacas (2.94 billion U.S. dollars) in the first ten months of 2009, an increase of 4.2 percent over the same period of last year, according to the figures released on...Macao registered a trade deficit of 23.26 billion patacas (2.94 billion U.S. dollars) in the first ten months of 2009, an increase of 4.2 percent over the same period of last year, according to the figures released on Dec. 1, 2009 by the region’s Statistics and Census Service (DSEC).展开更多
文摘The origin and spatial-temporal variation of the Earth’s magnetic field(EMF)is one of the important scientific problems that has long been unsolved.The Macao Science Satellite-1(MSS-1)under construction is China’s first high-precision EMF measurement satellite.To satisfy the highly precise requirements of the MSS-1 orbit measurement,a light,high-precision,four-prism laser retroreflector array was designed.It weighs approximately 285 g,its effective reflection area is greater than 1.77 cm^(2),and its size is 100×100×41 mm.The laser retro-reflector array has excellent performance,and it can achieve a ranging precision at the subcentimeter level for satellite laser ranging.It will be developed and installed on the MSS-1 as a power-free load for high-precision orbit measurement and accurate orbit calibration.The MSS-1 is planned to be brought into the International Laser Ranging Service observations.More than 31satellite laser ranging stations in the International Laser Ranging Service around the world will be able to measure the MSS-1 with long arcs,which will support the scientific mission of high-precision EMF exploration.
文摘The value-added output of new industries,new types of business and new business models accounted for 15.7% of China’s GDP last year,up 0.4% from2016,the National Bureau of Statistics(NBS)said recently.
文摘Macao registered a trade deficit of 23.26 billion patacas (2.94 billion U.S. dollars) in the first ten months of 2009, an increase of 4.2 percent over the same period of last year, according to the figures released on Dec. 1, 2009 by the region’s Statistics and Census Service (DSEC).
