|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Characteristics of Long Air Gap Discharge Current Subjected to Switching Impulse显示文摘Measuring the pre-breakdown current of long sparks in air is important for investigating the discharge mechanism.Since the breakdown of long air gaps is conducted by a series of streamer-leader processes,the corresponding current signals cover a bandwidth of 0 to more than 20 MHz.Measurement accuracy of the current from the high voltage side is affected by the displacement current and impulse electromagnetic interference.In this paper,a coaxial current sensor with a DC bandwidth of 74.45 MHz is developed.A displacement current-restrained electrode structure is proposed to reduce the equivalent capacitance between the current sensor and the ground over 30 times.Combined with the digital optical fiber synchronous acquisition unit,a current measurement system for long air gap discharge is established.For the purpose of the UHV system’s external insulation optimization design,the discharge current waveform of a 6 m rod-plane air gap under positive switching impulse voltage with 250µs and 1000µs time to crest is obtained.Discharge images and stressed voltage are combined to analyze the continuous feature of a current waveform under critical time to crest impulse and discontinuous feature under long front duration impulse.For the purposes of a lightning protection study,the current waveform of a 10 m rod-plane air gap is subjected to negative switching impulse.Finally,the pulse characteristics of the current corresponding to the single channel and branching stepped negative leader are discussed. | Yishi Yue Hengxin He Weijiang Chen Junjia He Chuanqi Wu Xiangen Zhao Feng Huo | 2015 | CSEE Journal of Power and Energy Systems2015，1，3： | 13 |
| 2 | Mushroom Poisoning Outbreaks-China,2020显示文摘What is already known about this topic?Acute liver failure,rhabdomyolysis,acute renal failure,and hemolysis caused by poisonous mushrooms are the most important mushroom poisoning threats to the Chinese population.The most notorious lethal mushrooms are the species from genera Amanita,Lepiota,and Galerina that cause acute liver failure,and Russula subnigricans that leads to rhabdomyolysis.What is added by this report?In 2020,the total number of investigations reached 676,involving an estimated 102 species of poisonous mushrooms,24 of which were newly recorded in China.Gyromitra venenata was newly discovered in incidents in Yunnan and Guizhou provinces and were the first reported poisonings due to gyromitrins in China since 2000.The rare poisoning Shiitake mushroom dermatitis was recorded in China.Hemolysis poisoning caused by Paxillus involutus was recorded for the second time since the beginning of the new century,resulting in one death in Inner Mongolia Autonomous Region.What are the implications for public health practice?Promoting knowledge about safe consumption of mushrooms is essential to reduce mushroom poisonings.It is not wise to collect and eat wild mushrooms.For southwestern provinces such as Yunnan,especially,caution must be exercised with unfamiliar mushroom species. | Haijiao Li Hongshun Zhang Yizhe Zhang Jing Zhou Yu Yin Qian He Shaofeng Jiang Peibin Ma Yutao Zhang Ke Wen Yuan Yuan Nan Lang Bowen Cheng Junjia Lu Chengye Sun | 2021 | China CDC weekly2021，3，3： | 13 |
| 3 | Mushroom Poisoning Outbreaks--China,2019显示文摘What is already known about this topic?Mushroom poisoning is becoming one of the most serious food safety issues in China,which is responsible for nearly a half of all oral poisoning deaths.What is added by this report?In China,many mushrooms were previously“recorded”as poisonous.In this study,about 70 species obtained from mushroom poisoning incidents including several new records were confirmed accurately by morphological and molecular evidence in 2019,and spatial and temporal distribution characters of 13 lethal mushrooms were summarized systematically.What are the implications for public health practice?Precise and timely species identification is of pivotal importance in mushroom incidents.More efforts and cooperation are continued to be needed urgently for the governments,CDC staff,doctors and mycologists in future. | Haijiao Li Hongshun Zhang Yizhe Zhang Kaiping Zhang Jing Zhou Yu Yin Shaofeng Jiang Peibin Ma Qian He Yutao Zhang Ke Wen Yuan Yuan Nan Lang Junjia Lu Chengye Sun | 2020 | China CDC weekly2020，2，2： | 11 |
| 4 | Development and prospect of direct‐current circuit breaker in China显示文摘The direct‐current circuit breaker(DCCB)is the most ideal choice for DC fault isolation in DC grids.Despite a late start,China's research and development on the DCCB have made outstanding achievements.This article provides a brief glance of current China's DCCB development status.It begins by sorting out the technical route according to the topology of DCCB.Then it systematically summarises both mechanical and hybrid DCCBs with focussing on the aspects of topology structure and principle,key technology and characteristics,prototype development and application.It is apparent that Chinese scientists and engineers confronted the worldwide problem of large capacity DC breaking,and put forward a comprehensive solution which consists of an innovative topology structure based on coupled negative voltage circuit,breaking throughs on the key technologies such as highly controllable and reliable fault current commutation,millisecond‐level ultra‐fast and efficient electromagnetic repulsion mechanism,high tolerance and high stability power electronic switch,low residual voltage and fast response energy consumption device,etc.The article states that the world's first set of hybrid high‐voltage(HV)DCCB,and the first set of mechanical HV DCCB have been developed.These DCCBs will soon be deployed to the DC grids which have the highest voltage levels therefore require the strongest breaking capacity.These achievements are leading the world in the development and application of DCCB.The article also discusses the overall development trends of DCCB in the areas of new topologies,key techno-logical breakthroughs and application scenarios,etc.These discussions serve as references for DCCB's future technological advancement and its ever‐expanding applications. | Weijiang Chen Rong Zeng Junjia He Yi Wu Xiaoguang Wei Taixun Fang Zhanqing Yu Zhao Yuan Yifei Wu Wandi Zhou Bing Yang Lu Qu | 2021 | High Voltage2021，6，1： | 6 |
| 5 | Four COVID-19 Cases of New Variant B.1.351 First Emerging in South Africa in Chinese Passengers on Same Flight-Shenzhen,China,January 2021显示文摘At 04∶50 on January 1,2021,a 36-year-old Chinese project manager(Case A),a 29-year-old Chinese worker(Case B),and a 53-year-old Chinese businessman(Case C)returned from Africa(Case A and B from South Africa and Case C from Lesotho)on the same flight and tested coronavirus disease 2019(COVID-19)RNA positive by real-time polymerase chain reaction(PCR)by Baoan District People’s Hospital.Shenzhen CDC received their oral nasopharyngeal swabs packages from the hospital and retested COVID-19 RNA positive at 09∶50.Meanwhile,Case D. | Cong Cheng Lei Wang Ziquan Lyu Bo Peng Yinghui Li Dongfeng Kong Le Zuo Xiaomin Zhang Chao Yang Weiwen Liu Jia Wan Yijun Tang Junjia He Ying Wen Shule Xu Weihua Wu Ying Chen Guangnan Liu Junjie Xia Xuan Zou Renli Zhang Qinghua Hu Shujiang Mei Tiejian Feng | 2021 | China CDC weekly2021，3，8： | 2 |
| 6 | Metallurgical Aspects of Arc-remelted CuCr Contact Materials 显示文摘 | HE Junjia ZOU Jiyan | 1998 | Discharges and Electrical Insulation in Vacuum1998，2，： | 1 |
| 7 | Observation of leader development in rod-rod air gaps under negative switching impulse显示文摘 | Yaoheng Xie Hengxin He Junjia He | 2013 | Japanese Journal of Applied Physics2013，52，09： | 1 |
| 8 | The effect of corona discharge on leader initiation in long air gaps 显示文摘 | Yaoheng Xie Junjia He Chuanqi Wu | 2014 | IEEE Transactions on Plasma Science2014，42，4： | 1 |
| 9 | On-Line Estima- tion of Laser-Drilled Hole Depth Using a Machine Vision Method显示文摘 | Chaoching Ho Junjia He Teying Liao | 2012 | Sensors2012，12，10： | 1 |
| 10 | Protection of ±500 kV HVDC Double-circuit Converter Station from Lightning Induced Overvoltage显示文摘In order to obtain reasonable schemes of arrester in converter stations, the arrester scheme of 'Xiluodu-Guangdong HVDC ± 500 kV double circuit transmission' project against lighting induced overvoltage, which was designed according to the main principle of lightning protection in converter station, is discussed. A calculation of the lighting induced overvoltage in Zhaotong converter station un- der various operation modes is performed with ATP-EMTP software, then the surge arrester configuration of the converter station is decided, and the arrester protection schemes of smoothing reactor and neutral line are studied. It is concluded that additional protection is necessary because of the relatively large gap between protected disconnecting switch and arrester of metallic return transfer bus. Plus, the smoothing reactor (SR) arrester near the valve hall could be removed to improve the scheme’s economic performance. | DONG Manling YUAN Zhiyong LI Tianwei ZHAO Xiangen ZHANG Jiaxin HE Junjia | 2013 | 高电压技术2013，39，8： | 1 |
| 11 | Augmentation of current ramp-down contact pressure in Cshaped armature railguns显示文摘 | CHEN Lixue HE Junjia XIAO Zheng | 2011 | IEEE Transactions on Plasma Science2011，39，1： | 1 |
| 12 | A high-capacity triggered vacuum switch with single axial magnetic field electrode显示文摘 | He Junjia Zou Jiyan | 1999 | IEEE Trans on Magbetucs1999，35，1： | 1 |
| 13 | Simulations on arc surfaced C-shaped armatures for round-like bore railguns显示文摘 | Feng Deng He Junjia Chen Lixue | 2013 | IEEE Trans on Plas Sci2013，41，5： | 1 |
| 14 | Analysis of the performance of C-shaped armature with resistivity gradient显示文摘 | Xiao Zheng He Junjia Xia Shengguo | 2009 | IEEE Trans on Magn2009，45，1： | 1 |
| 15 | Evaluation of solid armature's in-bore position,velocity and current distribution using B-dot probes in railgun experiments显示文摘 | Wang Zijian He Junjia Li Jun | | 0，，01： | 1 |
| 16 | Comparison of positive leader propagation in rod-plane and inverted rod-plane Gaps显示文摘 | He Henxing He Junjia Chen Weijiang | 2012 | IEEE Transactions on Plasma Science2012，40，1： | 1 |
| 17 | Simula- tion on arc surfaced C-shaped armatures for round-like bore railguns显示文摘 | FENG Deng HE Junjia CHEN Lixue | 2013 | IEEE Transactions of Magnetics2013，41，5： | 1 |
| 18 | Augmentation of current rampdown contact pressure in Cshaped armature railguns显示文摘 | Chen Lixue He Junjia Xiao Zheng | 2011 | IEEE Transactions on Plasma Science2011，39，1： | 1 |
| 19 | A high-capacity triggered vacuum switch with single axial magnetic field electrode 显示文摘 | Junjia He Jiyan Zou | 1999 | IEEE Trans on Magnetics1999，35，1： | 1 |
| 20 | A high-capacity triggered vacuum switch with single axial magnetic field electrode显示文摘 | He Junjia Zou Jiyan | 1999 | IEEE Trans on Magnetics1999，35，1： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员