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Simulation of charge-exchange induced NBI losses on EAST

Plasma Science and Technology 2024年第9期26卷 133-147页

作者： Zhanhong liN Feng WANG ming XU Chaofeng SANG Chen zhang Zhengxiong WANG Key Laboratory of Materials Modification by Beams of the Ministry of Education School of PhysicsDalian University of TechnologyDalian 116024People’s Republic of China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People’s Republic of China

The neutral beam injection is widely adopted in tokamaks as a key heating tool,playing a crucial role in generating burning ***,the loss of beam ions can damage the first wall and reduce the heating efficiency,resulting in failure to maintain steady-state *** this work,the effect of neutral particles in the edge on fast ions generated by NBI in the Experimental Advanced Superconducting Tokamak(EAST)device is studied using the particle tracer code(PTC).The poloidal distribution of neutral particles is calculated by edge plasma simulation code *** this simulation,four beam lines in EAST are considered:co-current tangential(co-tang),co-current perpendicular(co-perp),counter-current tangential(ctr-tang)and counter-current perpendicular(ctr-perp).It is shown that,in the absence of neutral particles,the loss fraction of ctr-injection is considerably higher than that of the *** considering the neutral particles,it is found that the ctr-perp injection demonstrates a significant variation in particles loss fraction(ranging from 18.56%to 2..42.)compared to the other three injection *** terms of the loss fraction induced by neutral particles,ctr-injection exceeds co-injection,and perpendicular configuration exceeds tangential ***,the difference of charge exchange ratios of three different energy(full energy,half energy,one third energy)of the four injections can be attributed to variations in the poloidal trajectories associated with each of these ***,approximately half of fast ions which undergo neutralization directly lose to the first wall while the rest re-enter the bulk plasma and *** for the ctr-tang injection,the reionization ions from the other three injections exhibit effective confinement.

关键词： NBI charge exchange fast ion loss

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考虑时延的异质协作车队事件触发控制研究

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东北大学学报（自然科学版） 2024年第4期45卷 540-547页

作者：唐传茵夏冀沣章明理吴龙杰东北大学机械工程与自动化学院辽宁沈阳110819

针对目前研究较少考虑车辆混行造成的异质问题与时延问题,本文提出了一种具有时延的异质协作式自动驾驶车队事件触发控制方法 .首先,建立了考虑混行的异质车辆时延模型;其次,基于PID(proportional-integral-derivative)控制与模型预测控... 详细信息

针对目前研究较少考虑车辆混行造成的异质问题与时延问题,本文提出了一种具有时延的异质协作式自动驾驶车队事件触发控制方法 .首先,建立了考虑混行的异质车辆时延模型;其次,基于PID(proportional-integral-derivative)控制与模型预测控制(MPC),设计了不同模式下的事件触发控制器;然后,在城市和紧急情况下,对所提出的控制器进行了仿真分析;最后,基于Jetson Nano模型车进行了实车实验.仿真与实验结果表明,所提出的事件触发控制方法能够在不同情况下更好地权衡控制精度与计算速度间的矛盾.在带有通信时延的紧急情况下,仍能够保持较低的误差.

关键词：自动驾驶异质协作事件触发时延车队

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Black holes as the source of dark energy:A stringent test with high-redshift JWST AGNs

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Science china(Physics,Mechanics & Astronomy) 2024年第2期67卷 181-188页

作者： Lei Lei Lei Zu Guan-Wen Yuan Zhao-Qiang Shen Yi-Ying Wang Yuan-Zhu Wang Zhen-Bo Su Wen-Ke Ren Shao-Peng tang Hao Zhou Chi zhang Zhi-Ping Jin Lei Feng Yi-Zhong Fan Da-{{2. Wei Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China school of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory for Research in Galaxies and Cosmology Department of AstronomyUniversity of Science and Technology of ChinaHefei 230026China

Studies have proposed that there is evidence for cosmological coupling of black holes(BHs)with an index of k≈3;hence,BHs serve as the astrophysical source of dark ***,the data sample is limited for the redshifts of≤*** recent years,the James Webb Space Telescope(JWST)has detected many high-redshift active galactic nuclei(AGNs)and *** the JWST NIRSpec-/NIRCam-resolved AGNs,three are determined to be in early-type host galaxies with a redshift of z~***,their M_(*)and MBH are in tension with the predicted cosmological coupling of black holes with k=3 at a confidence level of~2.,which challenges the hypothesis that BHs serve as the origin of dark *** work on high-redshift AGNs using the JWST will further assess such a hypothesis by identifying more early-type host galaxies in the higher mass range.

关键词： dark energy supermassive black hole active galactic nuclei James Webb Space Telescope

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A Generic TC-Based Method to Find the Weakness in Different Phases of Masking Schemes

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Tsinghua Science and Technology 2018年第5期23卷 574-585页

作者： ming tang Yuguang li Yanbin li Pengbo Wang Dongyan Zhao Weigao Chen {{2. zhang school of Cyber Science and Engineering Wuhan University Wuhan 430072 China State Key Laboratory of Cryptology Beijing 100878 China State Grid Key Laboratory of PICD & AT Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing 100080 China State Grid Xinjiang Electric Power Corporation Maintenance Company Urumqi 830002 China

Masking is one of the most commonly used Side-Channel Attack （SCA） countermeasures and is built on a security framework, such as the ISW framework, and ensures theoretical security through secret sharing. Unfortunately, the theoretical security cannot guarantee practical security, because several possible weaknesses may exist in the actual implementation. These weaknesses likely come from the masking schemes or are introduced by the implementation methods. Finding the possible weakness of the masking scheme is an interesting and important issue for real applications. In this paper, the possible weaknesses for masking schemes in Field- Programmable Gate Array （FPGA） design are discussed. It was found that the combinational circuit is the key to the security of masking schemes. The Toggle Count （TC） method and its extension are utilized to evaluate the security of masking schemes in the design phase and the implementation phase separately. Comparing different logic-level simulators for the Xilinx FPGA platform, the behavioral and post-translate simulations are considered as the analysis method in the design phase, while the post-map and the post-route simulations are used to find the weakness during the implementation phase. Moreover, a Standard Delay Format （SDF） based improvement scheme is proposed to significantly increase the effectiveness of the TC model.

关键词： Side-Channel Attack (SCA) toggle count masking simulation-based analysis

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Probing dark matter particles from evaporating primordial black holes via electron scattering in the CDEX-10 experiment

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Science china(Physics,Mechanics & Astronomy) 2024年第10期67卷 83-91页

作者： Zhenhua zhang litao Yang Qian Yue Kejun Kang Yuanjing li Haipeng An Greeshma C. Jianping Chang Yunhua Chen Jianping Cheng Wenhan Dai Zhi Deng Changhao Fang Xinping Geng Hui Gong Qiuju Guo Tao Guo Xuyuan Guo li He Shengming He Jinwei Hu Hanxiong Huang Tuchen Huang lin Jiang S.Karmakar Haubin li Hanyu li Jianmin li Jin li Qianyun li Renmingjie li Xueqian li Yulan li Yifan liang Bin liao FongKay lin ShinTed lin Jiaxuan liu Shukui liu Yandong liu Yu liu Yuanyuan liu Hao Ma Yucai Mao Qiyuan Nie Jinhua Ning Hui Pan Ningchun Qi Jie Ren Xichao Ruan Monoj Kumar Singh Tianxi Sun Changjian tang Yang Tian Guangfu Wang Junzheng Wang li Wang Qing Wang Yufeng Wang Yunxiang Wang Henry Tsz-King Wong Shiyong Wu Yucheng Wu Haoyang Xing Rui Xu Yin Xu Tao Xue Yulu Yan Nan Yi Chunxu Yu Haijun Yu Jianfeng Yue ming Zeng Zhi Zeng Bingtao zhang Fengshou zhang Lei zhang Zhenyu zhang Jizhong Zhao Kangkang Zhao minggang Zhao Jifang Zhou Zuying Zhou Jingjun Zhu CDEX Collaboration Key Laboratory of Particle and Radiation Imaging(Ministry of Education)and Department of Engineering Physics Tsinghua UniversityBeijing 100084China Department of Physics Tsinghua UniversityBeijing 100084China Institute of Physics Academia SinicaTaipei 11529China NUCTECH Company Beijing 100084China YaLong River Hydropower Development Company Chengdu 610051China College of Nuclear Science and Technology Beijing Normal UniversityBeijing 100875China College of Physics Sichuan UniversityChengdu 610065China school of Physics Peking UniversityBeijing 100871China Department of Nuclear Physics China Institute of Atomic EnergyBeijing 102413China Sino-French Institute of Nuclear and Technology Sun Yet-sen UniversityZhuhai 519082China school of Physics Nankai UniversityTianjin 300071China Department of Physics Banaras Hindu UniversityVaranasi 221005India Department of Physics Beijing Normal UniversityBeijing 100875China 不详

Dark matter(DM)is a major constituent of the ***,no definite evidence of DM particles(denoted as“χ”)has been found in DM direct detection(DD)experiments to *** is a novel concept of detectingχfrom evaporating primordial black holes(PBHs).We search forχemitted from PBHs by investigating their interaction with target *** examined PBH masses range from 1×10^(15)to 7×10^(16)g under the current limits of PBH abundance *** 2.5.4 kg·day data obtained from the CDEX-10 experiment conducted in the china Jinping Underground Laboratory,we exclude theχ-electron(χ-e)elastic-scattering cross sectionσ_(χe)~5×10^(-2.)cm^(2.forχwith a mass■keV from our *** the higher radiation background but lower energy threshold(160 eV),CDEX-10 fills a part of the gap in the previous ***(m_(χ),σ_(χe))can be determined in the future,DD experiments are expected to impose strong constraints on fPBHfor large MPBHs.

关键词： CDEX primordial black hole light dark matter particle dark matter-electron scattering high purity germanium detector

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一种动态随机数发生器

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武汉大学学报（理学版） 2008年第5期54卷 513-516页

作者：李幼名唐明张焕国武汉大学计算机学院湖北武汉430072

构造了一种动态随机数发生器,将混沌和分组密码结合起来,先利用混沌的混迭特性产生伪随机比特流,然后利用分组密码杂化伪随机比特流,从而提高比特流的伪随机性;为了引入更多的熵,对分组密码的S盒的输入做系数可变的仿射变换.实验结果表... 详细信息

构造了一种动态随机数发生器,将混沌和分组密码结合起来,先利用混沌的混迭特性产生伪随机比特流,然后利用分组密码杂化伪随机比特流,从而提高比特流的伪随机性;为了引入更多的熵,对分组密码的S盒的输入做系数可变的仿射变换.实验结果表明,此随机数发生器可以通过NIST随机套件测试.

关键词：动态随机数发生器混沌分组密码

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对制定中国煤层气气质标准的建议

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天然气工业 2009年第4期29卷 121-124页

作者：郑贵强王勃唐书恒李景明张佳赞周明林中国地质大学(北京)能源学院中国石油勘探开发研究院廊坊分院武汉浅层技术公司

随着我国煤层气产业的快速发展,建立我国的煤层气气质标准迫在眉睫。由于煤层气与天然气成分上具有相似性,从而可以借鉴GB 1782.—1999《天然气》标准中的部分技术指标及测试方法,来制定煤层气的气质标准。据此讨论了制定我国煤层气气... 详细信息

随着我国煤层气产业的快速发展,建立我国的煤层气气质标准迫在眉睫。由于煤层气与天然气成分上具有相似性,从而可以借鉴GB 1782.—1999《天然气》标准中的部分技术指标及测试方法,来制定煤层气的气质标准。据此讨论了制定我国煤层气气质标准的原则,分析了煤层气中微量组分的测试方法和测试结果,经相关测试和计算,提供了标准参比条件、煤层气发热量、水露点、烃露点、CO2.量、汞含量等各项指标的建议数据。

关键词：煤层气气质标准制定组分测试指标建议

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基于GaSe/Ga_(2.O_(3)异质结的自供电日盲紫外光电探测器

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物理学报 2024年第11期73卷 360-367页

作者：宿冉奚昭颖李山张嘉汉姜明明刘增唐为华南京邮电大学集成电路科学与工程学院(产教融合学院) 氧化镓半导体创新中心(IC-GAO)南京210023 内蒙古大学电子信息工程学院呼和浩特010021 南京大学电子科学与工程学院南京210093 南京航空航天大学物理学院空天信息材料与物理工信部重点实验室南京211106

氧化镓(Ga_(2.O_(3))作为超宽禁带半导体在深紫外探测领域有极其重要的应用价值.它能与GaSe形成典型的Ⅱ型异质结构,促进载流子分离与传输,进而实现高性能的自供电探测.本文利用等离子体增强化学气相沉积(PECVD)技术在蓝宝石衬底上生长... 详细信息

氧化镓(Ga_(2.O_(3))作为超宽禁带半导体在深紫外探测领域有极其重要的应用价值.它能与GaSe形成典型的Ⅱ型异质结构,促进载流子分离与传输,进而实现高性能的自供电探测.本文利用等离子体增强化学气相沉积(PECVD)技术在蓝宝石衬底上生长了Ga_(2.O_(3)薄膜,并采用布里奇曼技术在氧化镓薄膜上生长了GaSe薄膜,构建了GaSe/β-Ga_(2.O_(3)异质结光电探测器,分析其中涉及的光物理与界面物理问题.该探测器对深紫外光有很好的响应性能,在8 V的电压下器件的暗电流仅为1.83 pA,2.4 nm光照下的光电流达到了6.5 nA,且UV-C/可见光(2.4 nm/600 nm)的抑制比约为354,即使在很小的光照强度下,响应度和探测度也达到了1.49 mA/W和6.65×10^(11)Jones.同时,由于结界面上的空间电荷区形成的光伏效应,该探测器在零偏压下表现出自供电性能,开路电压为0.2.V.此外,探测器有很好的灵敏度,无论是在电压恒定的条件下用不同光强的光照射探测器,还是在光强恒定条件下改变电压,器件都能快速响应.

关键词：光电探测器氧化镓硒化镓自供电

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The In-Flight Realtime Trigger and Localization Software of GECAM

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Research in Astronomy and Astrophysics 2024年第10期24卷 11-24页

作者： Xiao-Yun Zhao Shao-lin Xiong Xiang-Yang Wen Xin-Qiao li Ce Cai Shuo Xiao Qi Luo Wen-Xi Peng Dong-Ya Guo Zheng-Hua An Ke Gong Jin-Yuan liao Yan-Qiu zhang Yue Huang Lu li Xing Wen Fei zhang Jing Duan Chen-Wei Wang Dong-li Shi Peng zhang Qi-Bin Yi Chao-Yang li Yan-Bing Xu Xiao-Hua liang Ya-Qing liu Da-li zhang Xi-Lei Sun Fan zhang Gang Chen Huan-Yu Wang Sheng Yang Xiao-Jing liu Min Gao Mao-Shun li Jin-Zhou Wang Xing Zhou Yi Zhao Wang-Chen Xue Chao Zheng Jia-Cong liu Xing-Bo Han Jin-ling Qi Jia Huang Ke-Ke zhang Can Chen Xiong-Tao Yang Dong-Jie Hou Yu-Sa Wang Rui Qiao Xiang Ma Xiao-Bo li Ping Wang Xin-Ying Song li-ming Song Shi-Jie Zheng Bing li Hong-Mei zhang Yue Zhu Wei Chen Jian-Jian He Zhen zhang Jin Hou Hong-Jun Wang Yan-Chao Hao Xiang-Yu Wang Zong-Yuan Yang Zhi-Long Wen Zhi Chang Yuan-Yuan Du Rui Gao Xiao-Fei Lan Yan-Guo li Gang li Xu-Fang li Fang-Jun Lu Hong Lu Bin Meng Feng Shi Hui Wang Hui-Zhen Wang Yu-Peng Xu Jia-Wei Yang Xue-Juan Yang Shuang-Nan zhang Chao-Yue zhang Cheng-Mo zhang Zhi-Cheng {1{12. Cheng Cheng Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China school of Information Science and Technology Southwest Jiaotong UniversityChengdu 611756China Key Laboratory of Stellar and Interstellar Physics and Department of Physics Xiangtan UniversityXiangtan 411105China Physics and Space Science College China West Normal UniversityNanchong 637002China Department of Astronomy Beijing Normal UniversityBeijing 100875China Innovation Academy for Microsatellites of CAS Shanghai 201203China Changchun University of Science and Technology Changchun 130022China Chinese Academy of Sciences South America Center for Astronomy National Astronomical ObservatoriesCASBeijing 100101China

Realtime trigger and localization of bursts are the key functions of GECAM,an all-sky gamma-ray monitor launched on 2.2. December *** developed a multifunctional trigger and localization software operating in the CPU of the GECAM Electronic *** onboard software has the following features:high trigger efficiency for real celestial bursts with a suppression of false triggers caused by charged particle bursts and background fluctuation,dedicated localization algorithm optimized for both short and long bursts,and low time latency of the trigger information which is downlinked through the Global Short Message Communication service of the global BeiDou navigation *** paper provides a detailed description of the design and development of the trigger and localization software system for *** covers the general design,workflow,the main functions,and the algorithms used in the *** paper also includes on-ground trigger tests using simulated gamma-ray bursts generated by a dedicated X-ray tube,as well as an overview of the performance for real celestial bursts during its in-orbit operation.

关键词： telescopes instrumentation:detectors methods:observational

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走滑断层黏滑作用下隧道纵向及横断面分区破坏机理

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Journal of Central South University 2024年第1期31卷 250-271页

作者：杨恒洪王明年罗勋于丽张霄唐浪洲 school of Civil Engineering Southwest Jiaotong UniversityChengdu 610036China Key Laboratory of Transportation Tunnel Engineering Ministry of EducationSouthwest Jiaotong UniversityChengdu 610031China

黏滑作用下走滑断层将出现永久性的错动位移,当隧道与此类断层相交时将发生严重破坏,并且具有明显的分区特征。为了揭示隧道纵向和横断面的分区破坏机理,为穿越活动断裂带隧道抗震设计提供支撑,本文首先通过震害实例调研总结得到隧道的... 详细信息

黏滑作用下走滑断层将出现永久性的错动位移,当隧道与此类断层相交时将发生严重破坏,并且具有明显的分区特征。为了揭示隧道纵向和横断面的分区破坏机理,为穿越活动断裂带隧道抗震设计提供支撑,本文首先通过震害实例调研总结得到隧道的三种破坏模式,即环向裂缝、斜向裂缝和纵向裂缝。给出并讨论了断层类型、交角、错动量和隧道刚度等关键影响因素。结果表明:1)断层类型是影响隧道力学响应和安全性的最显著因素,而倾角影响很小;2.受左旋走滑断层黏滑作用的隧道沿纵向可分为弯曲-压缩-剪切(L-BCS)区和弯曲-压缩(L-BC)区,而受右旋走滑断层黏滑作用的隧道可分为弯曲-拉伸-剪切(L-BTS)区和弯曲-拉伸(L-BT)区;3)L-BCS区和L-BTS区的范围为1.4D~1.7D(D为隧道直径),而L-BC区和L-BT区范围随关键影响因素变化而变化;4)隧道横断面可分为偏心受压(C-EC)区和偏心受拉(C-ET)区,分别发生偏心受压破坏或偏心受拉破坏。C-EC区和C-ET区的范围约为距断层面5D;5)穿越左旋走滑断层隧道的C-EC区包括上盘左拱腰、下盘右拱腰、拱顶和仰拱,C-ET区包括下盘左拱腰和上盘右拱腰。穿越右旋走滑断层隧道的横断面分区分布与左旋对称。

关键词：走滑断层黏滑隧道工程分区破坏机理力学响应

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