牛津大学艺术史家柯律格(Craig Clunas)新著《回音室:1897—1935年跨国的中国画》(Echo Chamber:Chinese Painting in the Transnational Sphere,1897–1935)中译本于2024年5月出版。柯律格以1897年上海商务印书馆成立、1935年伦敦中国...牛津大学艺术史家柯律格(Craig Clunas)新著《回音室:1897—1935年跨国的中国画》(Echo Chamber:Chinese Painting in the Transnational Sphere,1897–1935)中译本于2024年5月出版。柯律格以1897年上海商务印书馆成立、1935年伦敦中国艺术国际展览会为时间节点,通过三组中外人物与事件的“非对称对话”,揭示中国画在全球现代性中的流动性、混杂性与主体性。展开更多
Magnetars are slowly rotating,highly magnetized young neutron stars that can show transient radio phenomena for radio pulses and fast radio bursts.We conducted radio observations from two magnetars SGR J1935+2154 and ...Magnetars are slowly rotating,highly magnetized young neutron stars that can show transient radio phenomena for radio pulses and fast radio bursts.We conducted radio observations from two magnetars SGR J1935+2154 and 3XMM J185246.6+003317 and a high-magnetic field pulsar PSR J1846-0258 using the Five-hundred-meter Aperture Spherical radio Telescope(FAST).We performed single pulse and periodicity searches and did not detect radio signals from them.From the piggyback data recorded by other FAST telescope beams when we observed the magnetar SGR 1935+2154,we serendipitously discovered a new radio pulsar,PSR J1935+2200.We carried out the follow-up observations and obtained the timing solution based on these new observations and the archive FAST data.PSR J1935+2200 is an isolated old pulsar,with a spin period of 0.91 s,a spin-period derivative of 9.19×10^(−15)s s^(−1),and a characteristic age of 1.57 Myr.It is a weak pulsar with a flux density of 9.8μJy at 1.25 GHz.Discovery of a new pulsar from the long FAST observations of 30 minutes implies that there may be more weak older pulsars in the Galactic disk to be discovered.展开更多
文摘牛津大学艺术史家柯律格(Craig Clunas)新著《回音室:1897—1935年跨国的中国画》(Echo Chamber:Chinese Painting in the Transnational Sphere,1897–1935)中译本于2024年5月出版。柯律格以1897年上海商务印书馆成立、1935年伦敦中国艺术国际展览会为时间节点,通过三组中外人物与事件的“非对称对话”,揭示中国画在全球现代性中的流动性、混杂性与主体性。
基金supported by the National Natural Science Foundation of China:Nos.11988101,and 11833009also the National SKA Program of China 2020SKA0120100.
文摘Magnetars are slowly rotating,highly magnetized young neutron stars that can show transient radio phenomena for radio pulses and fast radio bursts.We conducted radio observations from two magnetars SGR J1935+2154 and 3XMM J185246.6+003317 and a high-magnetic field pulsar PSR J1846-0258 using the Five-hundred-meter Aperture Spherical radio Telescope(FAST).We performed single pulse and periodicity searches and did not detect radio signals from them.From the piggyback data recorded by other FAST telescope beams when we observed the magnetar SGR 1935+2154,we serendipitously discovered a new radio pulsar,PSR J1935+2200.We carried out the follow-up observations and obtained the timing solution based on these new observations and the archive FAST data.PSR J1935+2200 is an isolated old pulsar,with a spin period of 0.91 s,a spin-period derivative of 9.19×10^(−15)s s^(−1),and a characteristic age of 1.57 Myr.It is a weak pulsar with a flux density of 9.8μJy at 1.25 GHz.Discovery of a new pulsar from the long FAST observations of 30 minutes implies that there may be more weak older pulsars in the Galactic disk to be discovered.
