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Study of magnetic field expansion using a plasma generator for space radiation active protection

Chinese Physics C 2013年第9期37卷 99-103页

作者：贾向红贾少霞许峰白延强万军刘洪涛蒋睿马洪波王守国 State Key Laboratory of Space Medicine Fundamentals and Application Chinese Astronaut Research and Training Center Key Laboratory of Microelectronics Devices & Integrated Technology Institute of Microelectronics of Chinese Academy of Sciences

There are many active protecting methods including Electrostatic Fields, Confined Magnetic Field, Unconfined Magnetic Field and Plasma Shielding etc. for defending the high-energy solar particle events （SPE） and Galactic Cosmic Rays （GCR） in deep space exploration. The concept of using cold plasma to expand a magnetic field is the best one of all possible methods so far. The magnetic field expansion caused by plasma can improve its protective efficiency of space particles. One kind of plasma generator has been developed and installed into the cylindrical permanent magnet in the eccentric. A plasma stream is produced using a helical-shaped antenna driven by a radio-frequency （RF） power supply of 13.56 MHz, which exits from both sides of the magnet and makes the magnetic field expand on one side. The discharging belts phenomenon is similar to the Earth＇s radiation belt, but the mechanism has yet to be understood. A magnetic probe is used to measure the magnetic field expansion distributions, and the results indicate that the magnetic field intensity increases under higher increments of the discharge power.

关键词： plasma stream magnetic field expansion space radiation active protection

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Polydopamine wrapped polyaniline nanosheets: Synthesis and anticorrosion application for waterborne epoxy coatings

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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 2024年第000期176卷 155-166页

作者： Hu, X. P. Zhang, Y. H. Liu, C. B. Cui, H. Z. Shandong Univ Sci & Technol Sch Mat Sci & Engn Qingdao 266590 Peoples R China Ocean Univ China Sch Mat Sci & Engn Qingdao 266100 Peoples R China

Two-dimensional materials have been proved to be effective in improving the performance of anticorrosive coatings. However, most of the reported two-dimensional materials only have the ability to passively block corrosive media and cannot effectively inhibit localized corrosion reactions at the metal/coating interface. Herein, we first synthesized a novel polyaniline (PANI) nanosheet with both barrier and passivation functions for metals. In addition, polydopamine (PDA) wrapped PANI nanosheets (PANI@PDA) were obtained by in situ self-polymerization reaction of dopamine on the PANI surface, which enhance its interfacial interaction with polymeric resin. The chemical structure, morphology and corrosion inhibition properties of the nanosheets were systematically analyzed. The incorporated PANI@PDA nanosheets in composite coating provide a longer penetration path for corrosive mediums. Secondly, the uniformly dispersed two-dimensional nanosheets induce the formation of passivation film on the metal substrate. The protective effect of PANI@PDA nanosheets on coatings was verified by electrochemical impedance spectroscopy (EIS). Results indicated that the prepared composite coating exhibited excellent corrosion resistance throughout the test cycle. This simple and effective modification strategy based on conductive polymers provides a new insight into the development of environmentally adaptive composite coatings with active and passive protection.(c) 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

关键词： Corrosion prevention Polyaniline Polydopamine Nanosheet active protection CORROSION protection SURFACE-CHEMISTRY GRAPHENE STEEL PERFORMANCES COMPOSITES

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Study of MA protection Technology of Extending Inheritance Hierarchy Trees in IDC Network Management

Study of MA Protection Technology of Extending Inheritance H...

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2009中国控制与决策会议

作者： Wu Jiehong~1,Liu Cheng~1,Gao Fuxiang~2 1.Engineering Training Center,Shenyang Institute of Aeronautical and Engineering,Shenyang 110136,China 2.College of Information Science and Engineering,Northeastern University,Shenyang 110006,China

Mobile agents(MA) are autonomous software entities that are able to migrate across heterogeneous network execution *** and autonomy compensate the deficiencies of distributed technology pretty well. Thus,mobile agents have wide application *** the security issues with mobile agents have not been solved and are becoming obstacles for the application of mobile *** with host protection,the research on mobile agent protection is still at the beginning *** is a technique in which the mobile code producer enforces the security policy by applying a behavior transformation to the code before sending it to run on different *** paper presents a protection scheme of mobile agent in network management application,which combining method of extending inheritance hierarchy tree and time checking technology to protect the security of *** protection scheme is tested in actual network management environment,which can effectively identify the malicious host.

关键词： mobile agent extending inheritance hierarchy tree active protection time checking

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