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A multi-channel real-time digital integrator for magnetic diagnostics in HL-2A tokamak

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Nuclear Science and Techniques 2016年第1期27卷 82-87页

作者： Chao Chen Wei-Wei Fan Yin-Hai Pan Xiao-quan ji Ze-jie Yin State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Southwestern Institute of Physics Chengdu 610041China

A novel full-digital integrator has been developed for the magnetic diagnostics in HL-2A. Based on the pipeline processing of the field-programmable gate array and high-speed PCI extensions for instrumentation platform, the digital integrator has realized octal-channel10-k Hz real-time integration and data transmission. In order to reduce the integration drift, a 24-bit analog-todigital converter and simple analog processing circuits are applied for high-precision sampling, while certain correction algorithms are used to minimize the drift. With simple and highly integrated circuits and high-performance digital processor, the digital integrator is of high stability and functional expansibility which greatly simplifies the operation procedure. The digital integrator has been tested in the plasma discharge experiments, and the experimental results have confirmed that the drift performance and accuracy of the digital integrator could fully meet the requirements of HL-2A.

关键词：数字积分器托卡马克诊断实时多通道现场可编程门阵列等离子体放电模拟处理

Assessing Maize Drought Hazard for Agricultural Areas Based on the Fuzzy Gamma Model

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Journal of Integrative Agriculture 2013年第3期12卷 532-540页

作者： LIU Xing-peng ZHANG ji-quan CAI Wei-ying TONG Zhi-jun Natural Disaster Research Institute College of Urban and Environmental Sciences Northeast Normal University Key Laboratory for Vegetation Ecology Ministry of Education/Northeast Normal University College of Tourism Changchun University

Drought is one of the severe meteorological disasters and causes of serious losses for agricultural productions, and early assessment of drought hazard degree is critical in management of maize farming. This study proposes a novel method for assessment of maize drought hazard in different growth stages. First, the study divided the maize growth period into four critical growth stages, including seeding, elongation, tasseling, and filling. Second, maize drought causal factors were selected and the fuzzy membership function was established. Finally, the study built a fuzzy gamma model to assess maize drought hazards, and the gamma 0.93 was finally established using Monte Carlo Analysis. Performing fuzzy gamma operation with 0.93 for gamma and classifying the area yielded a map of maize drought hazards with four zones of light, moderate, severe, and extreme droughts. Using actual field collected data, seven selected samples for drought hazard degree were examined, the model output proved to be a valid tool in the assessment maize drought hazard. This model will be very useful in analyzing the spatial change of maize drought hazard and influence on yield, which is significant for drought management in major agricultural areas.

关键词： maize growth period fuzzy gamma modeling drought hazard

Evolutionary game dynamics of combining the Moran and imitation processes

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Chinese Physics B 2019年第2期28卷 94-105页

作者： Xian-jia Wang Cui-Ling Gu Shao-jie Lv ji quan Economics and Management School Wuhan University Institute of Systems Engineering Wuhan University School of Management Wuhan University of Technology

One of the assumptions of previous research in evolutionary game dynamics is that individuals use only one rule to update their strategy. In reality, an individual's strategy update rules may change with the environment, and it is possible for an individual to use two or more rules to update their strategy. We consider the case where an individual updates strategies based on the Moran and imitation processes, and establish mixed stochastic evolutionary game dynamics by combining both processes. Our aim is to study how individuals change strategies based on two update rules and how this affects evolutionary game dynamics. We obtain an analytic expression and properties of the fixation probability and fixation times(the unconditional fixation time or conditional average fixation time) associated with our proposed process. We find unexpected results. The fixation probability within the proposed model is independent of the probabilities that the individual adopts the imitation rule update strategy. This implies that the fixation probability within the proposed model is equal to that from the Moran and imitation processes. The one-third rule holds in the proposed mixed model. However, under weak selection, the fixation times are different from those of the Moran and imitation processes because it is connected with the probability that individuals adopt an imitation update rule. Numerical examples are presented to illustrate the relationships between fixation times and the probability that an individual adopts the imitation update rule, as well as between fixation times and selection intensity. From the simulated analysis, we find that the fixation time for a mixed process is greater than that of the Moran process, but is less than that of the imitation process. Moreover, the fixation times for a cooperator in the proposed process increase as the probability of adopting an imitation update increases; however, the relationship becomes more complex than a linear relationshi

关键词： evolutionary game dynamics Moran process imitation process fixation probability fixation time

Synthesis and NO production inhibition of novel Mannich base derivatives of irisolidone

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Chinese Chemical Letters 2008年第4期19卷 387-389页

作者： jiao Wang Ying Zhong Lu Liu Xin quan ji Zhi Guo Zhang Institute of Materia Medica Shandong Academy of Medical SciencesJinan 250062China The National Center for Drug Screening Shanghai 201203China Pharmacological Institute of New Drugs School of PharmacyShandong UniversityJinan 250012China

Five new C-8 Mannich base derivatives of irisolidone 2a-2e were synthesized and their nitric oxide（NO）production inhibitory activity was *** 2a,2b,2c and 2e displayed stronger activities in vitro than the parent com... 详细信息

关键词： Irisolidone Mannich reaction Mannich base Nitric oxide(NO)production inhibition

STRUCTURE DESIGN OF THE BEIjiNG SPECTROMETERⅢBEAM PIPE

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Chinese Journal of Mechanical Engineering 2008年第3期21卷 1-6页

作者： ZHENG Lifang ji quan WANG Li LI xunfeng XU Shaowang DONG Sujun ZHAO Libin LIU jianping School of Mechanical Engineering University of Science and Technology Beijing Beijing 100083 China Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Department of Flight Vehicle Design and Applied Mechanics Beihang University Beijing 100083 China School of Mechanical Engineering Tianjin University Tianjin 300072 China

The Beijing spectrometer Ⅲ （BESⅢ） beam pipe is in the center of the BESⅢ, which is the detector of the upgrade project of Beijing electron and positron collider （BEPC Ⅱ）. Electrons and positrons collide in the BESⅢ beam pipe. According to the demands of the BEPC Ⅱ, a key program of Chinese Academy of Sciences, the BESⅢ beam pipe is designed based on the finite elements analysis. The BESIII beam pipe is installed in the inner cylinder of the BESⅢ drift chamber. As a vacuum tube, the BESIII beam pipe is designed as 1 000 mm in length, 63 mm in inner diameter and 114 mm in outer diameter, respectively. The BESIII beam pipe consists of a central beryllium pipe cooled by EDM-1, the oil No.1 for electric discharge machining, and two extended copper pipes cooled by deionized water （DW）. The three parts are jointed by vacuum welding. Factors taken into account in the design are as follows. ① The wall thickness of the central beryllium pipe should be designed as small as possible to reduce the multi-scattering and improve the particle momentum resolution. And the wall thickness of the extended copper pipe should be designed as large as possible to protect the detectors from the backgrounds. ②The BESⅢ beam pipe must be sufficiently cooled to avoid the damage and prevents its influence to the BESⅢ drift chamber （DC） operation. The inner surface temperature of the DC inner cylinder must be maintained at 293±2 K. ③ The magnetic permeability of the materials used in the BESⅢ beam pipe must be less than 1.05 H/m to avoid large magnetic field distortions. ④ The static pressure of the vacuum chamber of the BESⅢ beam pipe must be less than 800 μPa. The simulating results show that the designed structure of the BESⅢ beam pipe satisfies the requirements mentioned above. The structure design scheme is evaluated and adonted hv the headouarters of BEPCⅡ.

关键词： Beam pipe Beijing spectrometer Ⅲ Structure design Beijing electron and positron collider Ⅱ BESⅢ

Neoclassical tearing mode stabilization by electron cyclotron current drive for HL-2M tokamak

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Chinese Physics B 2021年第7期30卷 355-361页

作者： jing-Chun Li jia-Qi Dong Xiao-quan ji You-Jun Hu Department of Earth and Space Sciences Southern University of Science and TechnologyShenzhen 518000China University of California IrvineCalifornia 92697USA Southwestern Institute of Physics Chengdu 610041China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China

Investigation of neoclassical tearing mode and its suppression by electron cyclotron current drive(ECCD)has been carried out in HL-2 M *** current driving capability of the electron cyclotron wave is *** is found that the deposition location can be effectively controlled by changing the poloidal *** validation of electron cyclotron wave heating and current driving has been demonstrated for the upper launcher *** show that 3.0 MW and2.5 MW modulated ECCD can completely stabilize(2,1)and(3,2)NTMs,*** non-modulated ECCD,radial misalignment as well as current profile broadening have deleterious effect on the NTM *** time required for suppression of(3,2)mode is shorter than that required for the suppression of(2,1)***,the time needed for complete stabilization at different initial island width has been quantitatively presented and analyzed.

关键词： neoclassical tearing mode magnetic island electron cyclotron current drive numerical modelling

Stochastic evolutionary public goods game with first and second order costly punishments in finite populations

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Chinese Physics B 2018年第6期27卷 119-126页

作者： ji quan Yu-Qing Chu Wei Liu Xian-jia Wang Xiu-Kang Yang School of Management Wuhan University of Technology Wuhan 430070 China School of Science Wuhan University of Technology Wuhan 430070 China School of Resources and Environmental Engineering Wuhan University of Technology Wuhan 430070 China School of Economics and Management Wuhan University Wuhan 430072 China

We study the stochastic evolutionary public goods game with punishment in a finite size population. Two kinds of costly punishments are considered, i.e., first-order punishment in which only the defectors are punished, and second-order punishment in which both the defectors and the cooperators who do not punish the defective behaviors are punished. We focus on the stochastic stable equilibrium of the system. In the population, the evolutionary process of strategies is described as a finite state Markov process. The evolutionary equilibrium of the system and its stochastic stability are analyzed by the limit distribution of the Markov process. By numerical experiments, our findings are as follows.（i） The first-order costly punishment can change the evolutionary dynamics and equilibrium of the public goods game, and it can promote cooperation only when both the intensity of punishment and the return on investment parameters are large enough.（ii）Under the first-order punishment, the further imposition of the second-order punishment cannot change the evolutionary dynamics of the system dramatically, but can only change the probability of the system to select the equilibrium points in the ＂C＋P＂ states, which refer to the co-existence states of cooperation and punishment. The second-order punishment has limited roles in promoting cooperation, except for some critical combinations of parameters.（iii） When the system chooses＂C＋P＂ states with probability one, the increase of the punishment probability under second-order punishment will further increase the proportion of the ＂P＂ strategy in the ＂C＋P＂ states.

关键词： public goods games stochastic stable equilibrium punishment finite population

Bevacizumab as adjuvant therapy in the management of pterygium: a systematic review and Meta-analysis

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International Journal of Ophthalmology(English edition) 2017年第7期10卷 1126-1133页

作者： jian Liu jie-Hui Xu Wen Xu Guan-Lu Liang ji-Xian Lou Yi Wang ji-quan Wen Yong-Bao Cao Department of Ophthalmology Zhejiang Hospital Eye Center the Second Affiliated Hospital of Zhejiang UniversityCollege of Medicine

AIM： To evaluate the clinical effect of bevacizumab in pterygium ***： A systematic review and quantitative Metaanalysis was performed. Pub Med, EMBASE, Web of Science and Cochrane database were searched for eligible literatures published in English until June 2016. The endpoint was recurrence rate and pooled risk ratio（RR） was ***： Nine eligible studies were included and Metaanalysis results showed no significantly difference in patients treated with bevacizumab in short term followup [3mo： RR=0.70（0.34, 1.45）; 6mo： RR=0.55（0.23, 1.32）] compared with control groups. No significant effects were observed in favor of bevacizumab in subgroup analyses： patients with subconjunctival injection of bevacizumab [3mo： RR=0.95（0.70, 1.29）; 6mo： RR=0.83（0.55, 1.28）], primary pterygium [3mo： RR=0.59（0.23, 1.54; 6mo： RR=0.59（0.23, 1.53）], simple pterygium excision [3mo： 0.32（0.05, 2.04）, P=0.23; 6mo： 0.27（0.05, 1.53）] and excision with conjunctival autograft [3mo： 1.51（0.25, 9.15）; 6mo： 1.11（0.06, 21.69）].CONCLUSION： In this Meta-analysis, we did not found the significant effect of bevacizumab in pterygium treatment, at least in short term follow-up（3mo and 6mo）.

关键词： pterygium bevacizumab therapy recurrence Meta-analysis

Immunoproteomic Analysis of Bordetella bronchiseptica Outer Membrane Proteins and Identification of New Immunogenic Proteins

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Journal of Integrative Agriculture 2014年第9期13卷 2010-2018页

作者： LIU Yan QIN Feng-yan BAO Guo-lian CHEN Hui XIAO Chen-wen WEI Qiang ji quan-an Animal Husbandry and Veterinary Institute Zhejiang Academy of Agricultural Sciences

Bordetella bronchiseptica is a Gram-negative pathogen that causes acute and chronic respiratory infection in a variety of animals. To identify useful antigen candidates for diagnosis and subunit vaccine of B. bronchiseptica, immunoproteomic analysis was adopted to analyse outer membrane proteins of it. The outer membrane proteins extracted from B. bronchiseptica were separated by two-dimensional gel electrophoresis and analyzed by Western blotting for their reactivity with the convalescent serum against two strains. Immunogenic proteins were identified by matrix-assisted laser desorption/ionization time of flight-mass spectrometry（MALDI-TOF-MS）, a total of 14 proteins are common immunoreactive proteins, of which 1 was known antigen and 13 were novel immunogenic proteins for B. bronchiseptica. Putative lipoprotein gene was cloned and recombinantly expressed. The recombinant protein induced high titer antibody, but showed low protective indices against challenges with HB（B. bronchiseptica strain isolated from a infected rabbit）. The mortality of mice was 80% compared to 100% of positive controls. The identification of these novel antigenic proteins is an important resource for further development of a new diagnostic test and vaccine for B. bronchiseptica.

关键词： Bordetella bronchiseptica outer membrane proteins immunoproteomic analysis