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A BRIEF INTRODUCTION TO GEOSPACE DOUBLE STAR PROGRAM

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空间科学学报 2002年第Z1期22卷 29-34页

作者： liu zhenxing Center for Space Science and Applied Research The Chinese Academy of Sciences Beijing 100080 P.R. China

The Geospace Double Star Exploration Project (DSP) contains two small satel lites operating in the near-earth equatorial and polar regions respectively. The tasks of DSP are: (1) to provide high-resolution field, particle and wave mea surements in several important near-earth active regions which have not been covered by existing ISTP missions, such as the near-earth plasma sheet and its boundary layer, the ring current, the radiation belts, the dayside magnetopause boundary layer, and the polar region; (2) to investigate he trigger mechanisms of magnetic storms, magnetospheric substorms, and magnetospheric particle storms, as well as the responses of geospace storms to solar activities and in terplanetary disturbances; (3) to set up the models describing the spatial and temporal variations of the near-earth space *** complete the mission, there are eight instruments on board the equatorial satellite and the polar satellite, respectively. The orbit of the equatorial satellite is proposed with a perigee at 550km and an apogee at 60 000km, and the inclination is about 28.5°; while the orbit of the polar satellite with a perigee at 700 km and an apogee at 40 000 km, as well as an inclination about 90°. The equatorial and polar satellites are planed to be launched into orbits in June 2003 and December 2003 respectively to take coordinating measurements with Cluster Ⅱ and other missions.

关键词： Solar-Terrestrial space physics, Double star exploration project,International cooperation

Transition-metal-free coupling reactions involving gem–diborylalkanes

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Chinese Chemical Letters 2023年第7期34卷 17-22页

作者： Yongli Li Dalong Shen Hao Zhang zhenxing liu College of Chemistry Zhengzhou UniversityZhengzhou 450002China

Due to the increasing demand for the sustainability of modern organic chemistry, the development of green and powerful methods for C-C and C-B bond formation is highly desired. Among them, the transition-metal-free coupling reactions of gem–diborylalkanes emerge as one valuable tool for organic chemists in the last decade. The review covers selected representative examples. A comparison of these reactions with transition-metal-catalyzed reactions is provided. The recent example of α-boryl radical formation from gem–diborylalkanes is also briefly discussed.

关键词： Transition-metal-free Coupling reactions gem–Diborylalkane Sustainable chemistry Radical

Observations of kinetic Alfvén waves by THEMIS near a substorm onset

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Chinese Science Bulletin 2012年第12期57卷 1429-1435页

作者： DUAN SuPing liu zhenxing ANGELOPOULOS Vassilis State Key Laboratory of Space Weather Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100190 China Institute of Geophysics and Planetary Physics University of California Los Angeles California 90095 USA

Low frequency electromagnetic fluctuations in the vicinity of a magnetospheric substorm onset were investigated using simultaneous observations by THEMIS multiple probes in the near-Earth plasma sheet in the *** observations indicate that in the vicinity of a substorm onset,kinetic Alfvén waves can be excited in the high-βplasma sheet(β=2μ0nT/B 2 ,the ratio of plasma thermal pressure to magnetic pressure)within the near-Earth *** kinetic Alfvén wave has a small spatial scale in the high-β*** parallel electric field accompanying kinetic Alfvén waves accelerates the charged particles along the magnetic *** kinetic Alfvén waves play an important role in the substorm trigger process,and possibly in the formation of a substorm current wedge.

关键词：阿尔文波动力学暴发病观测等离子体片亚暴电流楔地球磁尾空间尺度

A Brief Introduction and Recent Progress of the Geospace Double Star Program

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空间科学学报 2004年第Z1期24卷 39-45页

作者： liu zhenxing CAO Jinbin Center for Space Science and Applied Research The Chinese Academy of Sciences Beijing 100080 China Center for Space Science and Applied Research The Chinese Academy of Sciences Beijing 100080 China

The Geospace Double Star Project (DSP) consists of two small satellites operating in the near-earth equatorial and polar regions, respectively. The goals of DSP are: (1) to provide high-resolution field, particle, and wave measurements in some important near-earth active regions which have not been covered by current ISTP missions, such as the near-earth plasma sheet and its boundary layer, the ring current, the radiation belts, the dayside magnetopause boundary layer, and the polar region; (2) to investigate the trigger mechanisms of magnetic storms, magnetospheric substorms, and magnetospheric particle events,as well as the responses of geospace storms to solar activities and interplanetary disturbances; (3) to set up the models describing the spatial and temporal variations of the near-earth space *** realize the above goals, the equatorial satellite TC-1 and the polar satellite TC-2 will accommodate, respectively, eight instruments on board. TC-1was launched successfully in December 2003 while the polar satellite (TC-2)will be launched in July 2004. The orbit of the equatorial satellite TC-1 consists of a perigee at 550 km, an apogee at 60 000 km, and an inclination of about 28.5; while the orbit of the polar satellite will have a perigee of 700 km, an apogee of 40 000 km, and an inclination of about 90. The two satellites will take coordinated measurements with Cluster Ⅱ and will first form a "six-point exploration" in *** operational status of TC-1 are introduced in this paper.

关键词： Solar-terrestrial space physics, Double star exploration project,International cooperation

Multi-Scale Physical Process in the Magnetosphere

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空间科学学报 2008年第5期28卷 454-467页

作者： CAO Jinbin liu zhenxing State Key Laboratory for Space Weather Center for Space Sciences and Applied Research Chinese Academy of Sciences Beijing 100190

The brief report presents a part of the research results of the magnetospheric physics researches in China during the period of 2006—*** the past two years,China-ESA co-operation DSP(Double Star Program) satellites were basically operating normally in its extended *** DSP and Cluster missions provide Chinese space physicists high quality data to study multi-scale physical process in the *** work made based on the data of DSP is presented in the paper of "Progress of Double Star Program" of this issue.

关键词：双星探测计划多尺度物理过程磁气圈空间研究

Magnetospheric Physics in China During the Period of 2004 - 2006

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空间科学学报 2006年第z1期26卷 97-111页

作者： CAO Jinbin liu zhenxing State Key Laboratory for Space Weather Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100080 China State Key Laboratory for Space Weather Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100080 China

Their brief report presents the advances of the magnetospheric physics researches in China during the period of 2004-2006. During the past two years, China-ESA cooperation DSP (Double Star Program) satellites were successively launched. In addition, China also participated in the scientific research of ESA's Cluster mission. The DSP and Cluster missions provide Chinese space physicists high quality data to study multiscale physical process in the magnetosphere. The work made based on the data of DSP is presented in the paper of "Progress of Double Star Program" of this issue.

关键词： Magnetosphere physics

Release of Pb adsorbed on graphene oxide surfaces under conditions of Shewanella putrefaciens metabolism

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Journal of Environmental Sciences 2022年第8期34卷 67-75页

作者： Jianfeng Zhang ShichangWei zhenxing liu Huang Tang Xiaoguang Meng Weihuang Zhu Shaanxi Key Laboratory of Environmental Engineering Key Laboratory of Northwest Water ResourceEnvironment and EcologyMOEXi’an University of Architecture and TechnologyXi’an 710055China Center for Environmental Systems Stevens Institute of TechnologyNJ 07030USA

In this study, Pb(Ⅱ) was used as a target heavy metal pollutant, and the metabolism of Shewanella putrefaciens(S. putrefaciens) was applied to achieve reducing conditions to study the effect of microbial reduction on lead that was preadsorbed on graphene oxide(GO) *** results showed that GO was transformed to its reduced form(r-GO) by bacteria, and this process induced the release of Pb(Ⅱ) adsorbed on the GO surfaces. After 72 hr of exposure in an S. putrefaciens system, 5.76% of the total adsorbed Pb(Ⅱ) was stably dispersed in solution in the form of a Pb(Ⅱ)-extracellular polymer substance(EPS) complex, while another portion of Pb(Ⅱ) released from GO-Pb(Ⅱ) was observed as lead phosphate hydroxide(Pb_(10)(PO_(4))_(6)(OH)_(2))precipitates or adsorbed species on the surface of the cell. Additionally, increasing pH induced the stripping of oxidative debris(OD) and elevated the content of dispersible Pb(Ⅱ)in aqueous solution under the conditions of S. putrefaciens metabolism. These research results provide valuable information regarding the migration of heavy metals adsorbed on GO under reducing conditions due to microbial metabolism.

关键词： Graphene oxide Pb(Ⅱ) Shewanella putrefaciens Extracellular polymeric substances Microbial reduction

Progress of Double Star Program

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空间科学学报 2006年第z1期26卷 7-13页

作者： liu zhenxing CAO Jinbin Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100080 China Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100080 China

The Double Star Programme (DSP) is the first joint space mission between China and ESA. The mission, which is made of two spacecraft, is designed to investigate the magnetospheric global processes and their response to the interplanetary disturbances in conjunction with the Cluster mission. The first spacecraft, TC-1 (Tan Ce means "Explorer"), was launched on 30 December 2003, and the second one, TC-2, on 25 July 2004 on board two Chinese Long March 2C. Due to the importance of and success of DSP, both CNSA and ESA approved the extension of DSP. This paper presents DSP mission and some important scientific results made based on the data of DSP.

关键词： Double Star Program, Magnetosphere

Progress of Double Star Program 2006—2008

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空间科学学报 2008年第5期28卷 385-389页

作者： liu zhenxing CAO Jinbin State Key Laboratory for Space Weather Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100190

This paper presents the status of two satellites of Double Star Program,and a part of scientific results based on the data of Double Star Program obtained during the period of *** scientific results in the magnetosphe... 详细信息

关键词：地球空间双星探测计划中国研究进展空间技术