The effects of thermionic emission on dust-acoustic solitons with a very small but finite amplitude in a dustelectron plasma are studied using the reductive perturbation technique. The self-consistent variation of dus...The effects of thermionic emission on dust-acoustic solitons with a very small but finite amplitude in a dustelectron plasma are studied using the reductive perturbation technique. The self-consistent variation of dust charge is taken into account. It is shown that the thermionic emission could significantly increase the dust positive charge. The dependences of the phase velocity, amplitude, and width of such solitons on the dust temperature and the dust work function of dust material are plotted and discussed.展开更多
2018年7月30日美国《彭博商业周刊》(Bloomberg Business Week)推出了主题为“新空间时代”(The New Space Age)的专刊,围绕航天器发射、近地及绕月飞行、小天体及深空探测等,对新空间时代“瞄准深空、商业驱动、低成本发射”等特点进...2018年7月30日美国《彭博商业周刊》(Bloomberg Business Week)推出了主题为“新空间时代”(The New Space Age)的专刊,围绕航天器发射、近地及绕月飞行、小天体及深空探测等,对新空间时代“瞄准深空、商业驱动、低成本发射”等特点进行了阐述。这与专刊副标题“更远、更快、更廉价,下一个新经济领域触手可及”(Farther,faster,cheaper--thenext economic frontier is within reach)相互印证,反映出新空间时代的特征。展开更多
基金Supported by the National Natural Science Foundation China under Grant Nos 40390150, 10175013, 10010760807, 10160420799, 40390155, 40228006 and 10575018.
文摘The effects of thermionic emission on dust-acoustic solitons with a very small but finite amplitude in a dustelectron plasma are studied using the reductive perturbation technique. The self-consistent variation of dust charge is taken into account. It is shown that the thermionic emission could significantly increase the dust positive charge. The dependences of the phase velocity, amplitude, and width of such solitons on the dust temperature and the dust work function of dust material are plotted and discussed.
文摘2018年7月30日美国《彭博商业周刊》(Bloomberg Business Week)推出了主题为“新空间时代”(The New Space Age)的专刊,围绕航天器发射、近地及绕月飞行、小天体及深空探测等,对新空间时代“瞄准深空、商业驱动、低成本发射”等特点进行了阐述。这与专刊副标题“更远、更快、更廉价,下一个新经济领域触手可及”(Farther,faster,cheaper--thenext economic frontier is within reach)相互印证,反映出新空间时代的特征。
文摘为了给《2020年天文和天体物理学十年调查》中的中型任务概念即＂探测器概念研究＂（Probe Mission Concept Studies）提供输入,美国NASA征集了相关任务概念建议,即＂天体探测器任务概念研究＂（Astrophysics Probes Mission Concept Studies）。此次征集作为NASA＂空间和地球科学＂计划框架下的一个研究机会公告（Research Opportunities in Space and Earth Sciences,ROSES）,
