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Sparse channel recovery with inter-carrier interference self-cancellation in OFDM

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Journal of Systems Engineering and Electronics 2018年第4期29卷 676-683页

作者： hu jiansheng SONG Zuxun GUO Shuxia ZHANG Qian ShuI Dongdong School of Electronics and Information Northwestern Polytechnical University School of Information Engineering Engineering Universtiy of Chinese People's Armed Police Force

A new sparse channel estimation method of orthogonal frequency division multiplexing（OFDM） system based on intercarrier interference（ICI） self-cancellation is investigated. Firstly,based on the characteristic that the ICI generated by a subcarrier to the two adjacent subcarriers is approximately equal, a data pair with opposite sign and equal magnitude is modulated onto two adjacent subcarriers as pilot pair to eliminate the effect of ICI on pilots. Secondly, a new OFDM channel estimation model based on linear time-varying（LTV） model and compressed sensing（CS） is constructed, which obtains the mean of the gains of the ***, a pilot pair optimization algorithm based on two layers loop is used to realize the minimization of the mutual coherence of the measurement matrix. For time-varying channel scenes with different numbers or delay of multipath and maximum Doppler frequency shift, the performances of several channel estimation methods are verified by simulation. The result shows that the new method has obvious advantage in both the performance of the channel estimation and the spectral efficiency.

关键词： orthogonal frequency division multiplexing (OFDM) channel estimation compressed sensing (CS) inter-carrier inter-ference (ICI) pilot design

Coated boron layers by boronization and a real-time boron coating using an impurity powder dropper in the LHD

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Plasma Science and Technology 2024年第8期26卷 25-31页

作者： Naoko ASHIKAWA Robert LUNSFORD Federico NESPOLI Erik GILSON Yaowei YU jiansheng hu Shinichiro KADO National Institute for Fusion Science Toki 509-5292Japan Princeton Plasma Physics Laboratory Princeton NJ 08540United States of America Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People’s Republic of China Institute of Advanced Energy Kyoto UniversityKyoto 611-0011Japan

In the Large Helical Device(LHD),diborane(B2H6)is used as a standard boron source for boronization,which is assisted by helium glow *** 2019,a new Impurity Powder Dropper(IPD)system was installed and is under evaluation as a real-time wall conditioning *** the LHD,which is a large-sized heliotron device,an additional helium(He)glow discharge cleaning(GDC)after boronization was operated for a reduction in hydrogen recycling from the coated boron *** operational time of 3 h was determined by spectroscopic data during glow discharges.A flat hydrogen profile is obtained on the top surface of the coated boron on the specimen exposed to *** results suggest a reduction in hydrogen at the top surface by *** oxygen in coated boron was obtained by boronization,and the coated boron,which has boron-oxide,on the first wall by B-IPD was also *** the difference in coating areas between B2H6 boronization and B-IPD operation,it would be most effective to use the IPD and B2H6 boronization coating together for optimized wall conditioning.

关键词： boron layer oxygen impurity hydrogen recycling impurity powder dropper LHD EAST

The Cultural Interpretations of "Golden Sound and Jade Vibration"

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Journal of Literature and Art Studies 2019年第6期9卷 563-581页

作者： hu jiansheng School of humanities Shanghai Jiao Tong University Shanghai 200240 China

Limited by the writing habits of the small tradition, conventional scholars tend to interpret "golden sound and jade vibration" as a musical tempo representing virtues of saints. In fact, we can prove how "golden sound and jade vibration" are closely linked to the sacred material beliefs (e.g.,"holy gold","holy jade") and the prehistoric religious ritual activities, by using various oral cultures and physical images, deeply exploring the profound cultural roots of "golden sound" and "jade vibration" in the local knowledge tradition and tracing its genetic system back to the prehistoric Jade Age and Bronze Age. The concept of "golden sound and jade vibration" is the sacred aural symbol of the "sage" entering the imaginary and illusionary realm. It also highlights the genetic system of the sage having "great accomplishments" and the Chinese ritual music system.

关键词： golden sound jade vibration big tradition sage great accomplishments

Study of the tungsten sputtering source suppression by wall conditionings in the EAST tokamak

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Plasma Science and Technology 2021年第5期23卷 11-17页

作者： Junru WANG Yaowei YU Houyin WANG Bin CAO jiansheng hu Wei XU Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031People’s Republic of China University of Science and Technology of China Hefei 230026People’s Republic of China Key Laboratory of Photovoltaic and Energy Conservation Materials Chinese Academy of SciencesHefei 230031People’s Republic of China

The steady fusion plasma operation is constrained by tungsten(W)material sputtering issue in the EAST *** this work,the suppression of W sputtering source has been studied by advanced wall *** is also concluded that the W sputtering yield becomes more with increasing carbon(C)content in the main deuterium(D)*** EAST,the integrated use of discharge cleanings and lithium(Li)coating has positive effects on the suppression of W sputtering *** the plasma recovery experiments,it is suggested that the W intensity is reduced by approximately 60%with the help of~35 h Ion Cyclotron Radio Frequency Discharge Cleaning(ICRF-DC)and~40 g Li coating after vacuum *** first wall covered by Li film could be relieved from the bombardment of energetic particles,and the impurity in the vessel would be removed through the particle induced desorption and isotope exchange during the discharge *** general,the sputtering yield of W would decrease from the source,on the bias of the improvement of wall condition and the mitigation of plasmawall interaction *** lays important base of the achievement of high-parameter and longpulse plasma operation in *** experiences also would be constructive for us to promote the understanding of relevant physics and basis towards the ITER-like condition.

关键词： tungsten sputtering source carbon impurity wall conditioning PWI EAST

Plasma-tungsten interactions in experimental advanced superconducting tokamak(EAST)

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Tungsten 2019年第2期1卷 122-131页

作者： Fang Ding Guang-Nan Luo Xiahua Chen Hai Xie Rui Ding Chaofeng Sang Hongmin Mao Zhenhua hu Jing Wu Zhen Sun Liang Wang Youwen Sun jiansheng hu 无 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China Key Laboratory of Materials Modification by Laser Ion and Electron Beams(Ministry of Education)School of PhysicsDalian University of TechnologyDalian 116024China the EAST Team

Tungsten(W)is used as the armor material of the International Thermonuclear Experimental Reactor(ITER)divertor and is regarded as the potential first wall material of future fusion *** of the key challenges for the successful application of W in fusion devices is effective control of W at an extremely low concentration in *** and control of W erosion are not only a prerequisite for W impurity control,but also vital concerns to plasma-facing component(PFC)*** the application of ITER-like water-cooled full W divertor in EAST in 2014,great efforts were made to inves-tigate W erosion by experiment and simulation.A spectroscopic system was developed to provide a real-time measurement of W sputtering *** experiment and simulation results indicate that carbon(C)is the dominant impurity causing W sputtering in L-mode plasmas,which comes from the erosion of C plasma-facing material(PFM)in the lower divertor and the main chamber *** mixture layer on the surface of W PFCs formed through redeposition or the wall coating can effectively suppress W *** the plasma density and radiation can reduce incident ion energy,thus alleviating W *** H-mode plasmas,control of edge localized mode(ELM)via resonant magnetic perturbation(RMP)proves to be capable of suppressing intra-ELM W *** experiences and lessons from the EAST W divertor are beneficial to the design,manufacturing and operation of ITER and beyond.

关键词： Divertor Tungsten sputtering Erosion EAST Spectroscopy

Higher resolution helium measuring system for deuterium plasma on EAST tokamak via normal Penning gauge

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Plasma Science and Technology 2017年第1期19卷 90-96页

作者： Houyin WANG jiansheng hu Yaowei YU Bin CAO Jinhua WU Guoqing SHEN Zhao WAN and EAST Contributors Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 People＇s Republic of China

Although the deuterium and helium have almost the same mass,a Penning Optical Gas Analyzer（POGA） system on the basis of the spectroscopic method and Penning discharging has been designed on EAST,since *** POGA system was developed successfully in 2015,it was the first time that EAST could detect helium partial pressure in deuterium plasma（wall conditioning and plasma operation scenario）.With dedicated calibration and proper adjustment of the parameters,the minimum concentration of helium in deuterium gas can be measured as about 0.5% instead of 1% on the other tokamak ***,the He and D2 partial pressures are measured *** present,the measurable range of deuterium partial pressure is 1×10^-7 mbar to 1×10^-5mbar,meanwhile the range of helium is 1×10^-8 mbar to 1×10^-5 *** measurable range can be modified by means of the adjustment of POGA system＇s *** is possible to detect the interesting part of the gas with a time resolution of less than 5 ms（the 200 ms because of conductance of transfer pipe at present）.The POGA system was routinely employed to wall conditioning and helium enrichment investigation *** but not the least,the low temperature plasma of POGA is generated by normal penning gauge Pfeiffer IKR gauge instead of Alcatel CF2 P,which has been suspended for a few years and was used for almost all the POGA systems in the world.

关键词： penning discharge helium pressure detecting low temperature plasma PMT IKR 251 gauge

Fuel recycling feedback control via real-time boron powder injection in EAST with full metal wall

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Plasma Science and Technology 2024年第12期26卷 41-48页

作者： Zhe WANG Zhen SUN Guizhong ZUO Kai WU Yao huANG Wei XU Ming huANG Zhitai ZHOU Yanhong GUAN Haotian QIU Rajesh MAINGI jiansheng hu University of Science and Technology of China Hefei 230026People’s Republic of China Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031People’s Republic of China Princeton Plasma Physics Laboratory Princeton NJ 08540United States of America Institute of Energy Hefei Comprehensive National Science CenterHefei 230031People’s Republic of China

A feedback control of fuel recycling via real-time boron powder injection,addressing the issue of continuously increasing recycling in long-pulse plasma discharges,has been successfully developed and implemented on EAST *** feedback control system includes four main parts:the impurity powder dropper(IPD),a diagnostic system measuring fuel recycling level represented by D_(α)emission,a plasma control system(PCS)implementing the Proportional Integral Derivative(PID)algorithm,and a signal converter connecting the IPD and *** on this control system,both active control and feedback control experiments have recently been performed on EAST with a full metal *** experimental results show that the fuel recycling can be gradually reduced to lower level as PCS control voltage *** the feedback control experiments,it is also observed that the D_(α)emission is reduced to the level below the target D_(α)value by adjusting boron injection flow rate,indicating successful implementation of the fuel recycling feedback control on *** technique provides a new method for fuel recycling control of long pulse and high parameter plasma operations in future fusion devices.

关键词： fuel recycling feedback control boron powder EAST

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屈原“虬龙负熊”的文化编码

广西民族大学学报（哲学社会科学版） 2021年第1期43卷 78-86页

作者：胡建升上海交通大学人文学院上海200240

战国时期,由于龙文化的崛起,龙熊之间的文化关系已经开始令人感到困惑不已。在楚帛书的创世神话中,神熊位居太一的神话结构位置,成为中华创世神话中的创世者,这与早期人类与熊同洞同居时代的文化认知有关,熊兽冬天睡眠与春天复苏的生理... 详细信息

战国时期,由于龙文化的崛起,龙熊之间的文化关系已经开始令人感到困惑不已。在楚帛书的创世神话中,神熊位居太一的神话结构位置,成为中华创世神话中的创世者,这与早期人类与熊同洞同居时代的文化认知有关,熊兽冬天睡眠与春天复苏的生理特性,让早期人类将其当成是大地母亲自然节气的文化信使。神熊意象与北斗星的神话关联,使得神熊获得了至为尊贵的文化地位。在神话空间中,神熊位居中央,龙虎位列左右,构成了早期神话意象独特的空间关系。神熊、北斗与帝车是一组同名词,天帝乘坐帝车,驾驭神熊,巡游宇宙,布施万物。但帝车的神话驱动力在于神龙,神龙驱动帝车,成为华夏文化精神的核心意象组合。在神话结构上,神龙御车与神龙负熊是一致的。但随着神话叙事中对帝车的省略,促使天帝、神人与神龙的神话结合,神龙意象开始成为天帝巡游的重要环节,逐渐占据了核心驱动力的文化地位,而原本作为帝车环节的神熊意象却逐渐被人遗忘。总之,在早期大传统文化中,神熊代表太一至尊的一元结构,位居核心环节。而神龙代表驱动太一永恒运转的动力要素,居于次级环节。神龙负熊犹如"六龙御天"一样,体现了华夏早期文化精神的意象组合与环节贯通。

关键词：虬龙负熊太一北斗帝车神话空间

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晁公武《郡斋读书志》的史学思想

史学史研究 2010年第4期 33-38页

作者：胡建升上海交通大学人文学院中文系上海200240

晁公武的《郡斋读书志》史部书录中寄含了丰富的史学思想,尽管缺乏理论的逻辑体系,但还是具有很大的史学理论价值。本文通过爬疏《读书志》中的史学批评案例,认为晁公武的史学思想主要体现在:一是联系社会风气、史学发展来进行史部书籍... 详细信息

晁公武的《郡斋读书志》史部书录中寄含了丰富的史学思想,尽管缺乏理论的逻辑体系,但还是具有很大的史学理论价值。本文通过爬疏《读书志》中的史学批评案例,认为晁公武的史学思想主要体现在:一是联系社会风气、史学发展来进行史部书籍分类。二是标举"史家之心",凸显史学家的主体意识。三是强调史学家的史德修养。四是继承史书信实的传统精神,并提倡对史料文献进行征实考辨。同时也很关注史学的经世致用功能,以及推崇高简有法的史文观。

关键词：晁公武《郡斋读书志》史学思想