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基于检测结果的27.5kV交流无间隙金属氧化物避雷器质量提升措施

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铁道技术监督 2024年第2期52卷 41-42,47页

作者：宋瑞雷栋徐力张忠凯于雷中国铁道科学研究院集团有限公司标准计量研究所北京100081 同济大学铁道与城市轨道交通研究院上海201804 中国铁路哈尔滨局集团有限公司黑龙江哈尔滨150006

针对近几年委托检测的电气化铁道供电用27.5 kV交流无间隙金属氧化物避雷器检测结果,统计检测结果为不合格的试验项目。分析密封试验、弯曲负荷试验、2 ms方波电流冲击耐受试验、电阻片4/10大电流冲击耐受试验等试验项目检测结果为不合... 详细信息

针对近几年委托检测的电气化铁道供电用27.5 kV交流无间隙金属氧化物避雷器检测结果,统计检测结果为不合格的试验项目。分析密封试验、弯曲负荷试验、2 ms方波电流冲击耐受试验、电阻片4/10大电流冲击耐受试验等试验项目检测结果为不合格的原因,提出27.5kV避雷器质量提升措施。

关键词：电气化铁道供电交流无间隙金属氧化物避雷器检测结果不合格成因分析

A plasma equilibrium model for rapid estimation of SF-MPDT performance

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Plasma Science and Technology 2021年第10期23卷 40-48页

作者： Yifeng Fu Cheng Zhou Peng Wu zhongkai zhang Zun zhang Haibin Tang School of Space and Environment Beihang UniversityBeijing 100191People's Republic of China Beijing Institute of Control Engineering Beijing 100094People’s Republic of China School of Astronautics Beihang UniversityBeijing 100191People’s Republic of China Key Laboratory of Spacecraft Design Optimization&Dynamic Simulation Technologies Ministry of EducationBeijing 100083People’s Republic of China Laboratory of Space Environment Monitoring and Information Processing Ministry of Industry and Information TechnologyBeijing 100083People's Republic of China

In this work, a zero-dimensional plasma model for self-field magnetoplasmadynamic thrusters(SF-MPDTs) is proposed, which is based on the ion-number balance equation and energy balance equation, and can calculate the average electron temperature and the average ion temperature inside the discharge chamber conveniently. At the same time, the model can also predict the thruster performance, and the thruster performance predicted by the model is compared with experimental results, which proved the reliability of the model.

关键词： SF-MPDT plasma equilibrium diffusion equation thruster parameters

A large-area bionic skin for high-temperature energy harvesting applications

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Nano Research 2023年第7期16卷 10245-10255页

作者： Zhaojun Liu Bian Tian Yao Li Jiaming Lei zhongkai zhang Jiangjiang Liu Qijing Lin Chengkuo Lee Zhuangde Jiang State Key Laboratory for Mechanical Manufacturing Systems Engineering School of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710049China Department of Electrical&Computer Engineering National University of SingaporeSingapore 117576Singapore Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Yantai 265503China

For the large amount of waste heat wasted in daily life and industrial production,we propose a new type of flexible thermoelectric generators(F-TEGs)which can be used as a large area bionic skin to achieve energy harvesting of thermal *** reference to biological structures such as pinecone,succulent,and feathers,we have designed and fabricated a biomimetic flexible TEG that can be applied in a wide temperature range which has the highest temperature energy harvesting capability *** laminated free structure of the bionic F-TEG dramatically increases the efficiency and density of energy *** F-TEGs(single TEG only 101.2 mg in weight),without an additional heat sink,demonstrates the highest output voltage density of 286.1 mV/cm^(2)and the maximum power density is 66.5 mW/m^(2) at a temperature difference of nearly 1000℃.The flexible characteristics of F-TEGs make it possible to collect the diffused thermal energy by flexible attachment to the outer walls of high-temperature pipes and vessels of different diameters and *** work shows a new design and application concept for flexible thermal energy collectors,which fills the gap of flexible energy harvesting in high-temperature environment.

关键词： bionic structure high-temperature flexible thermoelectric generators(TEGs)

Identification of a novel DNA molecule associated with Tobacco leaf curl virus

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Chinese Science Bulletin 2002年第15期47卷 1273-1276页

作者： XIE Yan ZHOU Xueping LI Zhenghe zhang zhongkai LI Guixin Institute of Biotechnology Zhejiang UniversityHangzhou 310029China Yunnan Biotechnology Research Institute Yunnan Academy of Agricultural SciencesKunming 650223China

A circular DNA molecule, designated as DNAp, was identified in tobacco plants infected with Tobacco leaf curl virus (TLCV) isolates Y5 and Y8 by PCR using primers based on the conserved region of the two reported DNAp sequences of whitefly-transmitted geminiviruses (WTGs). The complete nucleotide sequences of DNAβ of Y5 and Y8 (TLCV DNAβ) were determined. Y5 DNAβ comprises 1333 nucleotides encoding 8 predicted ORFs with 4 ORFs in virion-sense DNA and 4 ORFs in complementary-sense DNA; Y8 DNAP consists of 1338 nucleotides encoding 7 predicted ORFs with 4 ORFs in virion-sense DNA and 3 ORFs in complementary-sense DNA. TLCV DNAβhas little sequence homology to DNA-A of TLCV, except that it shares conserved TAATATTAC loop sequence with TLCV DNA-A. Sequence comparison showed that Y5 DNAβ shared 85% sequence homology with Y8 DNAβ, and both Y5 DNAβ and Y8 DNAβ had relatively low sequence identity (51%-65%) with the reported DNAβ molecules associated with Agera-tum yellow vein virus and Cotton leaf

关键词： DNAp Tobacco leaf curl virus sequence Begomovirus Bemisa tabaci.

胸部物理治疗联合下肢运动训练对AECOPD患者的疗效

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江苏医药 2024年第1期50卷 59-62页

作者：王哲伟叶思思张中凯林秀秀温州医科大学附属第一医院康复医学科浙江325015 温州医科大学附属第一医院护理部浙江325015 温州医科大学附属第一医院呼吸与危重症医学科浙江325015

目的观察胸部物理治疗(CPT)联合下肢运动训练对慢性阻塞性肺疾病急性加重(AECOPD)患者的疗效。方法 55例AECOPD患者分为两组,CPT组(28例)在常规治疗的基础上实施CPT,联合组(27例)在CPT组的基础上增加下肢运动训练。比较两组患者的膈肌... 详细信息

目的观察胸部物理治疗(CPT)联合下肢运动训练对慢性阻塞性肺疾病急性加重(AECOPD)患者的疗效。方法 55例AECOPD患者分为两组,CPT组(28例)在常规治疗的基础上实施CPT,联合组(27例)在CPT组的基础上增加下肢运动训练。比较两组患者的膈肌移动度、氧合指数、PaCO_(2)、慢性阻塞性肺疾病评估测试(CAT)评分、Barthel指数(BI)评分以及分泌物黏稠度。结果治疗后,两组患者的膈肌移动度、氧合指数、PaCO_(2)、CAT评分、BI评分和分泌物黏稠度均优于治疗前(P<0.05),且联合组的膈肌移动度、氧合指数和PaCO_(2)优于CPT组(P<0.05)。结论 CPT联合下肢运动训练能有效改善AECOPD患者的膈肌功能、氧合指数和PaCO_(2),提高日常生活活动能力,减轻分泌物黏稠度。

关键词：胸部物理治疗下肢运动训练慢性阻塞性肺疾病急性加重

云南怒江番茄种植新区番茄病毒检测及病毒种传特性

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植物保护 2024年第1期50卷 272-279页

作者：刘玉莹熊志琦苏晓霞王田田吴阔郑宽瑜张仲凯云南省农业科学院生物技术与种质资源研究所云南省农业生物技术重点实验室昆明650205 云南大学资源植物研究院昆明650504

病毒病对番茄生产造成严重危害,近年来在番茄种植新区发生严重,疑似为种子带毒传播。本研究通过对云南省怒江州番茄种植新区的番茄病毒病样品采用RNA-seq高通量测序,RT-PCR验证的方法检测病毒种类;对番茄病果种子进行超薄切片制样透射... 详细信息

病毒病对番茄生产造成严重危害,近年来在番茄种植新区发生严重,疑似为种子带毒传播。本研究通过对云南省怒江州番茄种植新区的番茄病毒病样品采用RNA-seq高通量测序,RT-PCR验证的方法检测病毒种类;对番茄病果种子进行超薄切片制样透射电子显微镜观察,将病果种子播种后对种苗进行RT-PCR带毒检测。结果表明,RNA-seq高通量测序及RT-PCR检测到的病毒有番茄环纹斑点病毒(tomato zonate spot orthotospovirus, TZSV)、番茄黄斑驳相关病毒(tomato yellow mottle-associated virus, TYMaV)、辣椒脉斑驳病毒(chili veinal mottle virus, ChiVMV)、南方番茄病毒(southern tomato virus, STV)。透射电镜观察到种胚细胞及胚乳细胞中分布典型的正番茄斑萎病毒属Orthotospovirus病毒粒体。病果种子播种28 d后的种苗具有病毒病症状,通过RT-PCR检出TZSV、ChiVMV、STV,检出率分别为60%、100%、80%。上述研究结果为TZSV通过种子传播提供了有利的证据,并为源头防控番茄病毒病提供了依据。

关键词：番茄番茄病毒病毒检测 RNA-seq 种传病毒

Purification and Characterization of a New Ribosome Inactivating Protein from Cinchonaglycoside C-treated Tobacco Leaves

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Journal of Integrative Plant Biology 2007年第9期49卷 1327-1333页

作者： Yanmei Li Yantao Jia zhongkai zhang Xiaoying Chen Hongping He Rongxiang Fang Xiaojiang Hao State Key Laboratory of Photochemistry and Plant Resources in West China Kunming Institute of Botany the Chinese Academy of Sciences Kunming 650204 China State Key Laboratory of Plant Genomics Institute of Microbiology the Chinese Academy of Sciences Beijing 100080 China Laboratory of Plant Virology Yunnan Academy of Agricultural Sciences Kunming 650223 China The Graduate School of the Chinese Academy of Sciences Beijing 100049 China

A new ribosome-inactivating protein （RIP） with a molecular weight of 31 kDa induced by Cinchonaglycoside C （1） designated CIP31, was isolated from tobacco leaves. Analysis of this protein sequence indicated that it belongs to the RIP family and it was distinct from the other plant RIPs reported previously at its N-terminal amino acid sequence. CIP31 can directly impair synthesis of coat protein （CP） of tobacco mosaic virus （TMV）, which resulted in inhibition of TMV long distance movement and multiplication in tobacco plants at concentrations of ng/mL. Furthermore, no toxicity was shown to the growth and fertility of the plants. CIP31 was synthesized only in the presence of Cinchonaglycoside C （1） and was independent of the salicylic acid （SA） signal pathway. We provided evidence for the SA-independent biological induction of resistance.

关键词： antiviral protein Cinchonaglycoside C (1) coat protein medical plant ribosome inactivating protein salicylic acid tobacco mosaic virus.

Effect of Sb composition on the band alignment of InAs/GaAsSb quantum dots

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Chinese Physics B 2021年第1期30卷 519-522页

作者： Guangze Lu Zunren Lv zhongkai zhang Xiaoguang Yang Tao Yang Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Aiming to achieve InAs quantum dots(QDs) with a long carrier lifetime,the effects of Sb component in cap layers on the band alignment of the InAs/GaAsSb QDs have been *** QDs with high density and uniformity have been grown by molecular beam *** increasing Sb composition,the InAs/GaAsSb QDs exhibit a significant redshift and broadening photoluminescence(PL).With a high Sb component of 22%,the longest wavelength emission of the InAs/GaAs_(0.78)Sb_(0.22) QDs occurs at 1.5 μm at room *** power-dependence PL measurements indicate that with a low Sb component of 14%,the InAs/GaAs_(0.86)Sb_(0.14) QDs have a type-Ⅰ and a type-Ⅱ carrier recombination processes,*** a high Sb component of 22%,the InAs/GaAs_(0.78)Sb_(0.22) QDs have a pure type-Ⅱ band alignment,with three type-Ⅱ carrier recombination *** from time-resolved PL decay traces,the carrier lifetime of the InAs/GaAs_(0.78)Sb_(0.22) QDs reaches 16.86 ns,which is much longer than that of the InAs/GaAs_(0.86)Sb_(0.14) QDs(2.07 ns).These results obtained here are meaningful to realize high conversion efficiency intermediate-band QD solar cells and other opto-electronic device.

关键词： quantum dots type-Ⅱband alignment intermediate-band solar cell molecular beam epitaxy

Design and fabrication of a full elastic sub-micron-Newton scale thrust measurement system for plasma micro thrusters

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Plasma Science and Technology 2021年第10期23卷 29-39页

作者： zhongkai zhang Guanrong Hang Jiayun Qi Zun zhang Zhe zhang Jiubin Liu Wenjiang Yang Haibin Tang School of Space and Environment Beihang UniversityBeijing 100191People's Republic of China Shanghai Institute of Space Propulsion Shanghai Engineering Research Center of Space EngineShanghai 201112People's Republic of China School of Astronautics Beihang UniversityBeijing 100191People's Republic of China The Institute of Space Systems University of StuttgartStuttgart D-70569GermanyBeijing 100083People's Republic of China Key Laboratory of Spacecraft Design Optimization&Dynamic Simulation Technologies Ministry of EducationBeijing 100083People's Republic of China Laboratory of Space Environment Monitoring and Information Processing Ministry of Industry and Information TechnologyBeijing 100083People’s Republic of China

In this work,a force measurement system is proposed to measure the thrust of plasma microthruster with thrust magnitude ranging from sub-micro-Newtons to hundreds *** thrust measurement system uses an elastic torsional pendulum structure with a capacitance sensor to measure the displacement,which can reflect the position change caused by the applied force perpendicular to the pendulum *** the open-loop mode,the steady-state thrust or the impulse of the plasma micro-thruster can be obtained from the swing of the pendulum,and in the closed-loop mode the steady-state thrust can be obtained from the feedback force that keeps the pendulum at a specific *** thrust respond of the system was calibrated using an electrostatic weak force generation *** results show that the system can measure a thrust range from 0 to 200μN in both open-loop mode and closed-loop mode with a thrust resolution of 0.1μN,and the system can response to a pulse bit at the magnitude of 0.1 m N s generated by a micro cathode arc *** background noise of the closed-loop mode is lower than that of the open-loop mode,both less than 0.1 m N/Hz in the range of 10 mHz to 5 Hz.

关键词： plasma thruster micro-thrust measurement torsional pendulum