共查询到20条相似文献,搜索用时 46 毫秒
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V. S. Artyukh 《Radiophysics and Quantum Electronics》2011,53(9-10):505-511
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Na Wang Qian Xu Jun Ma Zhiyong Liu Qi Liu Hailong Zhang Xin Pei Maozheng Chen Richard N.Manchester Kejia Lee Xingwu Zheng Hans J.K?rcher Wulin Zhao Hongwei Li Dongwei Li Martin Süss Matthias Reichert Zhongyi Zhu Congsi Wang Mingshuai Li Rui Li Ning Li Guljaina Kazezkhan Wenming Yan Gang Wu Lang Cui Ming Zhang Haitao Li 《中国科学:物理学 力学 天文学(英文版)》2023,(8):154-165
This study presents a general outline of the Qitai radio telescope(QTT) project.Qitai,the site of the telescope,is a county of Xinjiang Uygur Autonomous Region of China,located in the east Tianshan Mountains at an elevation of about 1800 m.The QTT is a fully steerable,Gregorian-type telescope with a standard parabolic main reflector of 110 m diameter.The QTT has adopted an umbrella support,homology-symmetric lightweight design.The main reflector is active so that the deformation caused by gravit... 相似文献
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《Comptes Rendus Physique》2016,17(9):985-994
Comets are considered as the most primitive objects in the Solar System. Their composition provides information on the composition of the primitive solar nebula, 4.6 Gyr ago. The radio domain is a privileged tool to study the composition of cometary ices. Observations of the OH radical at 18 cm wavelength allow us to measure the water production rate. A wealth of molecules (and some of their isotopologues) coming from the sublimation of ices in the nucleus have been identified by observations in the millimetre and submillimetre domains. We present an historical review on radio observations of comets, focusing on the results from our group, and including recent observations with the Nançay radio telescope, the IRAM antennas, the Odin satellite, the Herschel space observatory, ALMA, and the MIRO instrument aboard the Rosetta space probe. 相似文献
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Albert D. Frost 《Contemporary Physics》2013,54(6):421-435
The radio astronomer requires a specialized combination of aerial and receiver to be able to detect, measure and map extra-terrestrial signals. The following article presents a brief account of the basic techniques employed. 相似文献
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M. E. Miller 《Radiophysics and Quantum Electronics》1989,32(3):199-207
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Large base-line radio interferometers 总被引:1,自引:0,他引:1
L. I. Matveenko N. S. Kardashev G. B. Sholomitskii 《Radiophysics and Quantum Electronics》1965,8(4):461-463
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This paper shows some improvements and new results of calibration of Chinese solar radio spectrometer by analyzing the daily
calibration data recorded in the period of 1997–2007. First, the calibration coefficient is fitted for three bands (1.0–2.0
GHz, 2.6–3.8 GHz, 5.2–7.6 GHz) of the spectrometer by using the moving-average method confined by the property of the daily
calibration data. By this calibration coefficient, the standard deviation of the calibration result was less than 10 sfu for
95% frequencies of 2.6–3.8 GHz band in 2003. This result is better than that calibrated with the constant coefficient. Second,
the calibration coefficient is found in good correlation with local air temperature for most frequencies of 2.6–3.8 GHz band.
Moreover, these results are helpful in the research of the quiet solar radio emission. 相似文献
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David S. De Young 《Physics Reports》1984,111(6):373-408
The physical processes which are currently thought to give rise to the observed characteristics of these objects are reviewed. The large-scale structure clearly demands a need for an in situ resupply of energy to the relativistic particle population, and in addition strongly suggests that the large-scale flow is non-relativistic. Examination of the data for compact sources indicates that relativistic motion may explain the observations, but that severe difficulties arise when such flows are coupled to the large-scale structure. Finally, various aspects of the poorly understood nuclear engine are reviewed. 相似文献
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In 2007, a very bright radio pulse was identified in the archival data of the Parkes Telescope in Australia, marking the beginning of a new research branch in astrophysics. In 2013, this kind of millisecond bursts with extremely high brightness temperature takes a unified name, fast radio burst(FRB). Over the first few years, FRBs seemed very mysterious because the sample of known events was limited. With the improvement of instruments over the last five years, hundreds of new FRBs have been discovered.The field is now undergoing a revolution and understanding of FRB has rapidly increased as new observational data increasingly accumulate. In this review, we will summarize the basic physics of FRBs and discuss the current research progress in this area.We have tried to cover a wide range of FRB topics, including the observational property, propagation effect, population study,radiation mechanism, source model, and application in cosmology. A framework based on the latest observational facts is now under construction. In the near future, this exciting field is expected to make significant breakthroughs. 相似文献