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2019 novel coronavirus outbreak:a quiz or final exam?

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Frontiers of Medicine 2020年第2期14卷 225-228页

作者： Jiuyang Xu yijun chen Hao chen Bin Cao Tsinghua University School of Medicine Beijing 100084China Department of Pulmonary and Critical Care Medicine Center for Respiratory MedicineChina-Japan Friendship HospitalBeijing 100029China Institute of Respiratory Medicine Chinese Academy of Medical SciencesPeking Union Medical CollegeBeijing 100005China Tsinghua University-Peking University Joint Center for Life Sciences Beijing 100084China

The 2019 novel coronavirus(2019-nCoV)is an emerging pathogen and is threatening the global ***,more than 28000 cases and 550 deaths have been reported within two months from disease *** with experience from previous epidemics in the last two decades,clinicians,scientists,officials,and citizens in China are all contributing to the prevention of further 2019-nCoV *** preliminary work has enabled us to understand the basic characteristics of 2019-nCoV,but there are still many unanswered *** is too early now to judge our performance in this *** and strengthened efforts should be made not only during the epidemic,but also afterwards in order to prepare for any incoming challenges.

关键词： 2019-nCoV novel coronavirus epidemic public response

FATIGUE　CRACK　PROPAGATION　RATE　OF　ZG35　STEEL　WITH　SEMI－ELLIPTICAL　SURFACE　CRACK

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中国有色金属学会会刊：英文版 1995年第3期5卷 147-149页

作者： chen, Fangjun Xu, Zhenxi Liu, Yaodong chen, yijun Guo, Zhaohua Zhao, Yuexiang Xiangtan Univ Xiangtan China

ＦＡＴＩＧＵＥＣＲＡＣＫＰＲＯＰＡＧＡＴＩＯＮＲＡＴＥＯＦＺＧ３５ＳＴＥＥＬＷＩＴＨＳＥＭＩ－ＥＬＬＩＰＴＩＣＡＬＳＵＲＦＡＣＥＣＲＡＣＫ￥Ｃｈｅｎ，Ｆａｎｇｊｕｎ；Ｘｕ，Ｚｈｅｎｘｉ；Ｌｉｕ，Ｙａｏｄｏｎｇ；Ｃｈｅ... 详细信息

ＦＡＴＩＧＵＥＣＲＡＣＫＰＲＯＰＡＧＡＴＩＯＮＲＡＴＥＯＦＺＧ３５ＳＴＥＥＬＷＩＴＨＳＥＭＩ－ＥＬＬＩＰＴＩＣＡＬＳＵＲＦＡＣＥＣＲＡＣＫ￥Ｃｈｅｎ，Ｆａｎｇｊｕｎ；Ｘｕ，Ｚｈｅｎｘｉ；Ｌｉｕ，Ｙａｏｄｏｎｇ；Ｃｈｅｎ，Ｙｉｊｕｎ；Ｇｕｏ，Ｚｈａｏｈ...

关键词： growth rate surface crack centrifuge bowl body

Follicles in pregnant rat ovary are incapable of steroidogenesis

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Chinese Science Bulletin 1999年第19期44卷 1797-1801页

作者： yijun chen Hongjuan Gao Yixun Liu Chinese Acad Sci Inst Zool State Key Lab Reprod Biol Beijing 100080 Peoples R China

Antral follicles are present in the ovaries throughout gestation. These follicles are 'physically immature' and cannot ovulate under the induction of LH/hCG. The purpose of the present study is to examine whether follicles in pregnant rat ovaries are capable of steroidogen-esis. StAR is believed to be the key regulator of steroid hormone biosynthesis. Antisense

关键词： follicles in pregnant ovary steroidogenic acute regulatory protein luteinizing hormone receptor in situ hybridization.

THREE-DIMENSIONAL FINITE ELEMENT ANALYSIS AND ALLOWABLE DEFECT ASSESSMENT OF THE CENTRIFUGE BOWL BODY

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Transactions of Nonferrous Metals Society of China 1996年第1期6卷 141-146页

作者： Xu Zhenxing chen Fanjun Wang Zhaoqi Xu Yan Liu Yaodong chen yijun Mechanical Engineering Department Xiangtan UniversityXiangtan 411105 Shanghai Branch of 701 Research Institute of General Co.of Shipping Industry of China Xiangtan Centrifuge Plant

For the first time,an allowable defect analysis of the bowl body of XZZ 1200-G Centrifuge was made by using fatigue fracture mechanics method;and,again for the first time,the design fatigue curve of the dangerous sect... 详细信息

关键词： bowl body of centrifuge fatigue fracture mechanics method crack

Dwell Scheduling Algorithm for Digital Array Radar

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Journal of Beijing Institute of Technology 2018年第1期27卷 74-82页

作者： Qun Zhang Di Meng Ying Luo yijun chen Institute of Information and Navigation Air Force Engineering University Xi' an 710077 China Collaborative Innovation Center of Information Sensing and Understanding Xi' an 710077 China

Aiming at the problem of resource allocation for digital array radar（ DAR）,a dwell scheduling algorithm is proposed in this paper. Firstly,the integrated priority of different radar tasks is designed,which ensures that the imaging tasks are scheduled without affecting the search and tracking tasks; Then,the optimal scheduling model of radar resource is established according to the constraints of pulse interleaving; Finally,a heuristic algorithm is used to solve the problem and a sparse-aperture cognitive ISAR imaging method is used to achieve partial precision tracking target imaging. Simulation results demonstrate that the proposed algorithm can both improve the performance of the radar system,and generate satisfactory imaging results.

关键词： digital array radar(DAR) resource optimal scheduling pulse interleaving sparse aperture imaging

A critical literature review of bioretention research for stormwater management in cold climate and future research recommendations

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Frontiers of Environmental Science & Engineering 2017年第4期11卷 23-37页

作者： Hannah Kratky Zhan Li yijun chen chengjin Wang Xiangfei Li Tong Yu Department of Civil and Environmental Engineering University of Alberta Edmonton Alberta T6G 1H9 Canada City Planning City of Edmonton Edmonton Alberta T5J 0J4 Canada

Bioretention is a popular best management practice of low impact development that el/ecUvely restores urban hydrologic characteristics to those ofpredevelopment and improves water quality prior to conveyance to surface waters. This is achieved by utilizing an engineered system containing a surface layer of mulch, a thick soil media often amended with a variety of materials to improve water oualitv, a variety of vegetation, and underdrains, depending on the surrounding soil *** systems have been studied quite extensively for warm climate applications, but ctata strongly supporting their long-tema efficacy and application in cold climates is sparse. Although it is apparent that biorelention is an effective stormwater management system, its design in cold climate needs further research. Existing cold climate research has shown that coarser media is required to prevent concrete frost from forming. For spring, summer and fall seasons, if sufficient permeability exists to drain the system prior to freezing, peak flow and volume reduction can be maintained. Additionally. contaminants that are removed via filtration are also not impacted by cold climates. In contrary, dissolved contaminants, nutrients, and organics are significantly more variable in their ability to be removed or degraded via bioretention in colder temperatures. Winter road maintenance salts have been shown to negatively impact the removal of some contaminants and positively impact others, while their effects on properly selected vegetation or bacteria health are also not well understood. Research in these water quality aspects has been inconsistent and therefore requires further study.

关键词： Bioretention Cold climate Low impact development Stormwater

Problems of private industrial economic development and its countermeasures for Zigong City,Sichuan Province,China

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Ecological Economy 2007年第4期3卷 456-463页

作者： Peng Likun chen yijun Department of Management Science Sichuan University of Science ＆ ENGINEERING Zigong 643000P.R.China

The differences of regional economic development between underdeveloped areas and developed areas are mainly embodied by different levels of private economic development. Since 20-year reform and opening-up to the outside world, the private industry of Zigong has developed gradually, become more and more economically competitive, and played a more and more important role in the economic structure of Zigong. This paper analyzes the problems of private economy and its countermeasures based on the research on its status quo.

关键词： West China Small and medium-sized cities,Zigong City Private economry Countermeasures for development

Core competitiveness of the western enterprise in China: risks and countermeasures

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Ecological Economy 2007年第2期3卷 209-216页

作者： chen yijun Peng Likun Department of Management Sichuan University of Science and EngineeringZigong 643000P.R.China

Core competitiveness is the source of competitive advantages as well as the guarantee of value growth of the enterprise. This paper discusses the cause of the risks of the core competitiveness of enterprises and the west enterprise, introduces analytical methods of the risks of the core competitiveness and measures guard against the risks of the core competitiveness.

关键词： Core competitiveness Risk Risk-proof

Simultaneous adsorption of As(Ⅲ) and Pb(Ⅱ) by the iron-sulfur codoped biochar composite:Competitive and synergistic effects

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Journal of Environmental Sciences 2023年第3期125卷 14-25页

作者： yijun chen Qintie Lin Xiaoqing Wen Jin He Haoyu Luo Quanfa Zhong Libin Wu Jiaqi Li Guangdong Industrial Contaminated Site Remediation Technology and Equipment Engineering Research CenterSchool of Environmental Science and EngineeringGuangdong University of TechnologyGuangzhou 510006China Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters Ministry of EducationSchool of Environment and EnergySouth China University of TechnologyGuangzhou 510006China Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education Institute of Environmental and Ecological EngineeringGuangdong University of TechnologyGuangzhou 510006China

Simultaneous elimination of As(Ⅲ) and Pb(Ⅱ) from wastewater is still a great *** this work,an iron-sulfur codoped biochar (Fe/S-BC) was successfully fabricated in a simplified way and was applied to the remediate the co-pollution of As(Ⅲ) and Pb(Ⅱ).The positive enthalpy indicated that the adsorption in As-Pb co-pollution was an endothermic *** mechanism of As(Ⅲ) removal could be illustrated by surface complexation,oxidation and *** addition to precipitation and complexation,the elimination mechanism of Pb(Ⅱ) also contained ion exchange and electrostatic *** and synergistic effects existed simultaneously in the co-contamination *** suppression of As(Ⅲ) was ascribed to competitive complexation of the two metals on Fe/S-BC,while the synergy of Pb(Ⅱ) was attributed to the formation of the PbFe2(AsO_(4))2(OH)*** experiments revealed that Fe/S-BC had outstanding ability to remove As(Ⅲ) and Pb(Ⅱ),regardless of pH dependency and interference by various coexisting *** maximum adsorption capacities of the Fe/S-BC for As(Ⅲ) and Pb(Ⅱ) were 91.2 mg/g and 631.7 mg/g,***/S-BC could be treated as a novel candidate for the elimination of As(Ⅲ)-Pb(Ⅱ) combined pollution.

关键词： Iron-sulfur codoped Biochar Arsenic and lead Co-contamination remediation