In combination with the authors previous obsewation about the splitting of Comet Halley in March 1986, the events involving the sharp, straight feature in the antisolar direction observed in the head of Comet Halley i...In combination with the authors previous obsewation about the splitting of Comet Halley in March 1986, the events involving the sharp, straight feature in the antisolar direction observed in the head of Comet Halley in 1910 (such as those occurring on May 14, 25 and 31, and June 2) are rediscussed The analysis leads to the following scenario: When Comet Halley explodes and splits, a fragment jettisoned or thrown off from the nucleus will, after moving in the direction of its tail, develop into a mini-comet. Although not well developed or permanent, it has its own plasma tail and, sometimes, a dust tail. If Bobrovnikoff’s definition of a secondary nucleus is assumed, then the fragment should be considered as a real secondary nucleus. It seems that the current idea of a tailward jet suggested by Sekanina and Larson is a wrong explanation for the plasma tail of a mini-comet and hence the rotation period of 52-53h for Comet Halley is展开更多
We discuss the results of the extensive efforts done over the past decade on the near environment of the central engines in Active Galactic Nuclei. The observational material is mainly based on the observations from G...We discuss the results of the extensive efforts done over the past decade on the near environment of the central engines in Active Galactic Nuclei. The observational material is mainly based on the observations from Ground based observatories in the optical, infrared and radio bands, and of space missions like GINGA, IUE, HST, CGRO, ISO, BeppoSAX and RXTE. The availability of this instrumentation with sufficient sensitivity for the study of these objects in the γ-rays, X-rays, EUV, UV as well as Optical, IR and radio domain has opened a complete new insight. Although the results have not yet lead to a complete and full understanding, they have demonstrated with a high degree of probability that the central engines of these objects are associated with massive blackholes. A strong effort will be required from the theoretical side to make certain that we can actually use the results to distinguish between the different model parameters and place the AGN’s in their proper place, not only as individual objects of interest, but also to clarify their place in the general scheme of the evolution in the Universe. The results obtained so far have not solved all the early questions, but with the promise of the new instruments a very exciting outlook exists for the future of the study of the physics of accretion in massive Black Holes.展开更多
The Fifth International SpaceConfefence of Pacific-BasinSocieties(ISCOPS),co-spon-sored by American Astronau-tical Society(AAS),ChineseSociety of Astronautics(CSA)and Japanese RocktetSocity(JRS),Was held inShanghai,Ch...The Fifth International SpaceConfefence of Pacific-BasinSocieties(ISCOPS),co-spon-sored by American Astronau-tical Society(AAS),ChineseSociety of Astronautics(CSA)and Japanese RocktetSocity(JRS),Was held inShanghai,China on June 8-9,1993.More than 100 repre-sentatives from the People’sRepublie of China,the展开更多
SCIENCE CHINA Physics, Mechanics & Astronomy (Sci China Phys Mech Astron) is a monthly peer-reviewed academic journal supervised by the Chinese Academy of Sciences, and cosponsored by the Chinese Academy of Scienc...SCIENCE CHINA Physics, Mechanics & Astronomy (Sci China Phys Mech Astron) is a monthly peer-reviewed academic journal supervised by the Chinese Academy of Sciences, and cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. Its primary mission is展开更多
如果将爱尔兰比作大西洋上的绿宝石,而将它的首都都柏林看成是绿宝石中一抹黝黑的点缀,那么要用什么样的词语来形容来自此处的God Is An Astronaut呢?是那抹黝黑中一滴晶莹的泪珠,还是沙子筑成的细腻的心?然而这些词语渐渐趋于普通泛滥...如果将爱尔兰比作大西洋上的绿宝石,而将它的首都都柏林看成是绿宝石中一抹黝黑的点缀,那么要用什么样的词语来形容来自此处的God Is An Astronaut呢?是那抹黝黑中一滴晶莹的泪珠,还是沙子筑成的细腻的心?然而这些词语渐渐趋于普通泛滥,又怎能将那些细节描述清楚。就像寻觅多时的一壶好酒,除去畅饮之后的唏嘘,别无它法。God Is An Astronaut这个名字始终让人充满幻想,它带着无法忽视的光芒,是从什么地方而来?又是何时来到人们身旁,究竟是在真实又神秘的早晨,还是在可怕而缓慢的黄昏?相信很多人都不会忘记他们的第二张专辑《All Is Violent All Is Bright》,既有猛烈狂暴的瞬间。展开更多
On January 22nd,Australia Astron Limited and Liaoning(Yingkou) Coastal Industrial Base inked an agreement for constructing a 400 thousand t/a tita-nium dioxide facility in Yingkou,Liaoning province of northeastern Chi...On January 22nd,Australia Astron Limited and Liaoning(Yingkou) Coastal Industrial Base inked an agreement for constructing a 400 thousand t/a tita-nium dioxide facility in Yingkou,Liaoning province of northeastern China.The planned plant is expected to have a total in-展开更多
文摘In combination with the authors previous obsewation about the splitting of Comet Halley in March 1986, the events involving the sharp, straight feature in the antisolar direction observed in the head of Comet Halley in 1910 (such as those occurring on May 14, 25 and 31, and June 2) are rediscussed The analysis leads to the following scenario: When Comet Halley explodes and splits, a fragment jettisoned or thrown off from the nucleus will, after moving in the direction of its tail, develop into a mini-comet. Although not well developed or permanent, it has its own plasma tail and, sometimes, a dust tail. If Bobrovnikoff’s definition of a secondary nucleus is assumed, then the fragment should be considered as a real secondary nucleus. It seems that the current idea of a tailward jet suggested by Sekanina and Larson is a wrong explanation for the plasma tail of a mini-comet and hence the rotation period of 52-53h for Comet Halley is
文摘We discuss the results of the extensive efforts done over the past decade on the near environment of the central engines in Active Galactic Nuclei. The observational material is mainly based on the observations from Ground based observatories in the optical, infrared and radio bands, and of space missions like GINGA, IUE, HST, CGRO, ISO, BeppoSAX and RXTE. The availability of this instrumentation with sufficient sensitivity for the study of these objects in the γ-rays, X-rays, EUV, UV as well as Optical, IR and radio domain has opened a complete new insight. Although the results have not yet lead to a complete and full understanding, they have demonstrated with a high degree of probability that the central engines of these objects are associated with massive blackholes. A strong effort will be required from the theoretical side to make certain that we can actually use the results to distinguish between the different model parameters and place the AGN’s in their proper place, not only as individual objects of interest, but also to clarify their place in the general scheme of the evolution in the Universe. The results obtained so far have not solved all the early questions, but with the promise of the new instruments a very exciting outlook exists for the future of the study of the physics of accretion in massive Black Holes.
文摘The Fifth International SpaceConfefence of Pacific-BasinSocieties(ISCOPS),co-spon-sored by American Astronau-tical Society(AAS),ChineseSociety of Astronautics(CSA)and Japanese RocktetSocity(JRS),Was held inShanghai,China on June 8-9,1993.More than 100 repre-sentatives from the People’sRepublie of China,the
文摘SCIENCE CHINA Physics, Mechanics & Astronomy (Sci China Phys Mech Astron) is a monthly peer-reviewed academic journal supervised by the Chinese Academy of Sciences, and cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. Its primary mission is
文摘如果将爱尔兰比作大西洋上的绿宝石,而将它的首都都柏林看成是绿宝石中一抹黝黑的点缀,那么要用什么样的词语来形容来自此处的God Is An Astronaut呢?是那抹黝黑中一滴晶莹的泪珠,还是沙子筑成的细腻的心?然而这些词语渐渐趋于普通泛滥,又怎能将那些细节描述清楚。就像寻觅多时的一壶好酒,除去畅饮之后的唏嘘,别无它法。God Is An Astronaut这个名字始终让人充满幻想,它带着无法忽视的光芒,是从什么地方而来?又是何时来到人们身旁,究竟是在真实又神秘的早晨,还是在可怕而缓慢的黄昏?相信很多人都不会忘记他们的第二张专辑《All Is Violent All Is Bright》,既有猛烈狂暴的瞬间。
文摘On January 22nd,Australia Astron Limited and Liaoning(Yingkou) Coastal Industrial Base inked an agreement for constructing a 400 thousand t/a tita-nium dioxide facility in Yingkou,Liaoning province of northeastern China.The planned plant is expected to have a total in-
