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Effect of ultraviolet irradiation and chlorination on ampicillin-resistant Escherichia coli and its ampicillin resistance gene

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Frontiers of Environmental Science & Engineering 2016年第3期10卷 522-530页

作者： Yuchen PANG Jingjing HUANG Jinying XI Hongying HU Yun ZHU Environmental Simulation and Pollution Control State Key Joint Laboratory School of Environment Tsinghua University Beijing 100084 China State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (SMARC) Graduate School at Shenzhen Tsinghua University Shenzhen 518055 China China Power Engineering Consulting Group Corporation Beijing 100120 China Institute of Biophysics Chinese Academy of Sciences Beijing 100101 China School of Life Sciences Tsinghua University Beijing 100084 China

Antibiotic resistance is a serious public health risk that may spread via potable and reclaimed water. Effective disinfection is important for inactivation of antibiotic-resistant bacteria and disruption of antibiotic resistance genes. Ampicillin is a widely prescribed antibiotic but its effectiveness is increasingly undermined by resistance. In this study, changes in ampicillin resistance for Escherichia coli （E. coli） CGMCC 1.1595 were analyzed after exposure to different doses of ultraviolet （UV） or chlorine, and damage incurred by the plasmid encoding ampicillin resistance gene blaTEM-1 was assessed. We reported a greater stability in ampicillinresistant E. coli CGMCC 1.1595 after UV irradiation or chlorination when compared with previously published data for other E. coli strains. UV irradiation and chlorination led to a shift in the mortality frequency distributions of ampicillin-resistant E. coli when subse-quently exposed to ampicillin. The ampicillin hemiinhibitory concentration （IC5o） without disinfection was 3800mg·L^-1, and an increment was observed after UV irradiation or chlorination. The IC50 of ampicillin-resistant E. coli was 1.5-fold higher at a UV dose of 40 mJ·cm^-2, and was 1.4-fold higher when exposed to 2.0 mg·L^-1 chlorine. These results indicate that UV irradiation and chlorination can potentially increase the risk of selection for E. coli strains with high ampicillin resistance. There was no evident damage to blaTEM-1 after 1-10 mg Cl2· L^-1 chlorination, while a UV dose of 80 mJ·cm^-2 yielded a damage ratio for blaTEM-1 of approximately ***, high UV doses are required for effective disruption of antibiotic resistance genes in bacteria.

关键词： antibiotic resistance Escherichia coli ampicillin resistance gene ultraviolet irradiation chlorination

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Hierarchical control of isolated power system with DFIG-based wind turbine and parallel-connected battery energy storage system

Hierarchical control of isolated power system with DFIG-base...

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2016 IEEE Information Technology, Networking, Electronic and Automation control Conference, ITNEC 2016

作者： Liqing, Liu Ping, Du Yuliang, Wan Zengqiang, Mi State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Baoding China Power Dispatching Control Center State Grid East Inner Mongolia Electric Power Company Limited Hohhot China

ISBN: (纸本)9781467391924

In this paper a two-level hierarchical control scheme is proposed for the coordinated control of DFIG-based wind turbine(DFIG) and battery energy storage system(BESS) within an isolated power system. The primary level consists of the local controllers associated with DFIG and BESS. With the indirect air gap flux linkage orientation technology adopted and the pitch control strategy improved, DFIG can maintain the voltage and frequency of isolated power system and operate along the transfer trajectory set by the second level control. With the P/Q control technology adopted, BESS can output special level of active and reactive power. The second level, consisting of a coordinate controller, is designed to coordinately regulate the active power output of DFIG and BESS, which can optimize the transfer trajectory of DFIG operation point and prolong the service life of BESS. Finally, Matlab/Simulink software is applied to verify the effectiveness of the proposed control strategy for the isolated power system. © 2016 IEEE.

关键词： controllers

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A novel location method for distribution hybrid lines

A novel location method for distribution hybrid lines

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IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Jun Teng Xin Zhan Liwei Xie Xiangjun Zeng Yixuan Liu Long Huang Yangzhou Power Supply Company State Grid Jiangsu Electric Power Corporation Yangzhou Jiangsu Province P. R. China Hunan Province Higher Education Key Laboratory of Power System Safety Operation and Control Changsha University of Science and Technology Changsha Hunan Province China

ISBN: (纸本)9781538614280

To solve effects of time synchronization problems in double-ended traveling wave location method and achieve exact identification of reflected wave crests in single-ended traveling wave location method, a novel location method is proposed in this paper. A preliminary fault location and approximate values of fault distance are calculated by double-ended principle firstly. Then fault point reflected waves' arrival time at both sides are calculated via using approximate values. Compared with theoretical time, a time error matrix is built and the value which is closest to zero is identified as the actual arrival time of fault point reflected wave. Finally, accurate location is accomplished based on the single-ended traveling wave principle. EMTP-ATP simulation results show that the proposed fault location method is feasible in hybrid lines and fault location accuracy is improved obviously.

关键词： power cables Fault location Impedance Synchronization Hybrid power systems Grounding Capacitance

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Hierarchical control of Isolated power system with DFIG-based Wind Turbine and Parallel-connected Battery Energy Storage system

Hierarchical Control of Isolated Power System with DFIG-base...

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2016 IEEE Information Technology,Networking,Electronic and Automation control Conference(ITNEC 2016)

作者： Liu Liqing Du Ping Wan Yuliang Mi Zengqiang State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources Power Dispatching Control Center State Grid East Inner Mongolia Electric Power Company Limited

ISBN: (纸本)9781467391955

In this paper a two-level hierarchical control scheme is proposed for the coordinated control of DFIG-based wind turbine(DFIG) and battery energy storage system(BESS)within an isolated power *** primary level consists of the local controllers associated with DFIG and *** the indirect air gap flux linkage orientation technology adopted and the pitch control strategy improved,DFIG can maintain the voltage and frequency of isolated power system and operate along the transfer trajectory set by the second level *** the P/Q control technology adopted,BESS can output special level of active and reactive *** second level,consisting of a coordinate controller,is designed to coordinately regulate the active power output of DFIG and BESS,which can optimize the transfer trajectory of DFIG operation point and prolong the service life of ***,Matlab/Simulink software is applied to verify the effectiveness of the proposed control strategy for the isolated power system.

关键词： DFIG BESS Indirect stator flux orientation Optimization of the transfer trajectory

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Prediction of line failure fault based on weighted fuzzy dynamic clustering and improved relational analysis

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IOP Conference Series: Earth and Environmental Science 2018年第1期133卷

作者： Xiaocheng Meng Renfei Che Shi Gao Juntao He Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan 250061 CHN School of Electrical Engineering Shandong University Jinan 250061 CHN State Grid Hebei Maintenance Branch Shijiazhuang 050070 CHN

With the advent of large data age, power system research has entered a new stage. At present, the main application of large data in the power system is the early warning analysis of the power equipment, that is, by collecting the relevant historical fault data information, the system security is improved by predicting the early warning and failure rate of different kinds of equipment under certain relational factors. In this paper, a method of line failure rate warning is proposed. Firstly, fuzzy dynamic clustering is carried out based on the collected historical information. Considering the imbalance between the attributes, the coefficient of variation is given to the corresponding weights. And then use the weighted fuzzy clustering to deal with the data more effectively. Then, by analyzing the basic idea and basic properties of the relational analysis model theory, the gray relational model is improved by combining the slope and the Deng model. And the incremental composition and composition of the two sequences are also considered to the gray relational model to obtain the gray relational degree between the various samples. The failure rate is predicted according to the principle of weighting. Finally, the concrete process is expounded by an example, and the validity and superiority of the proposed method are verified.

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Energy Internet: Concept and Practice Exploration

Energy Internet: Concept and Practice Exploration

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IEEE Conference on Energy Internet and Energy system Integration

作者： Lin Cheng Ning Qi Fang Zhang Huichao Kong Xuejin Huang State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Dongguan Power Supply Guangdong Power Grid Co. Ltd

ISBN: (纸本)9781538614280

Under the situations of energy crisis around the world, Energy Internet has become the focus of international academic and industrial areas. In this paper, comprehensive reviews and prospects were made based on the background and current research status of Energy Internet. Moreover, the core concept, basic structure, and operation mode of Energy Internet were introduced and discussed. Finally, constructive solutions to the current problems were proposed with the demonstration project of Energy Internet that is the Beijing New Aerotropolis, which draws the future of the Energy Internet.

关键词： Energy Internet Distributed generation Green and low-carbon Multi-energy

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The Application Of Variational Mode Decomposition For Diagnosing Rub-Impact Fault Of Dual-Rotor system Based On Acceleration Measurements

The Application Of Variational Mode Decomposition For Diagno...

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The 29th International Congress on Condition Monitoring and Diagnostic Engineering Management

作者： Nanfei Wang Dongxiang Jiang Te Han Yizhou Yang Hongzhi Xu State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Thermal EngineeringTsinghua University

ISBN: (纸本)9781510868434

As for aero-engine,it is relatively difficult to obtain the displacement signal,only to measure the acceleration *** the paper,aimed at the dual-rotor system test rig,the rub-impact is simulated and the acceleration signals collected from the bearing pedestal are analysed to extract the rubbing faults' ***-component extraction is an available method for vibration signal analysis of rotary machinery,so a novel method of rubbing fault diagnosis based on variational mode decomposition(VMD) is *** is a newly developed technique for adaptive signal decomposition,which can non-recursive decompose a multi-component signal into a number of quasi-orthogonal intrinsic mode *** the rub-impact fault occurs in the dual-rotor system,the acceleration vibration signals of the dual-rotor system will present amplitude-modulated feature because of the periodic rub-impact between the rotor and the *** is then applied to detect multiple rubbing-caused signatures for rotor-stator fault diagnosis via practical vibration *** using VMD,the rub-impact signal,background signal and noise signal can be separated efficiently and the fault feature of vibration signal of a rotor system with local rub-impact fault can be ***,the VMD method can be applied to the rub-impact fault diagnosis of the rotor systems efficiently.

关键词： Dual-rotor variational mode decomposition rubbing demodulation impact

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Analysis of influencing factors in hybrid state estimation

Analysis of influencing factors in hybrid state estimation

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2016 IEEE PES Asia Pacific power and Energy Engineering Conference, APPEEC 2016

作者： Xueliang, Yu Hengxu, Zhang Cao, Jianmei Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China State Grid of China Technology College Jinan China

ISBN: (纸本)9781509054183

Hybrid state estimation has become a significant tool to utilize PMU measurements in modern power dispatch center. Factors affecting estimation accuracy are discussed in this paper, including measurement number, PMU number and measurement uncertainty. And it also explores the extent of impacts with simulation results. PMU current phasors are transformed into pseudo power injections and their uncertainties are calculated by uncertainty propagation theory. PMU numbers and their optimal deployment are determined by integer quadratic programming approach. Monte Carlo simulations are carried out in IEEE 14-bus system in this paper. © 2016 IEEE.

关键词： Quadratic programming

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The electromagnetic equivalent modeling and simulation analysis of large size metal structure

The electromagnetic equivalent modeling and simulation analy...

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International Conference on Electrical, control Engineering and Computer Science, ECECS 2015

作者： Xie, Penghao Yuan, Jiansheng Bi, Junjian State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China Institute of Electrostatic and Electromagnetic Protection Mechanical Engineering College Shijiazhuang China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China Institute of Electrostatic and Electromagnetic Protection Mechanical Engineering College Shijiazhuang China

ISBN: (纸本)9781138029378

In order to study the electromagnetic coupling law of one typical metal body, electromagnetic simulation software FEKO is utilized to set up the typical metal body model. With the increase of the simulation frequency, different lengths of metal body internal coupling field curve gradually separated, has certain regularity of fitting. Preliminary determination by reducing the length of the metal equivalent for the test model is established and confirmed in law of fitting better experimental spectrum. © 2016 Taylor and Francis Group.

关键词： Metals

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Regional pole placement and feedback linearization of nonlinear wind turbine control system

Regional pole placement and feedback linearization of nonlin...

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American control Conference

作者： Zhongwei Lin Zhenyu Chen Xiaoming Li the State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer Engineering North China Electric Power University Beijing 102206 P. R. China the School of Automation Engineering Northeast Electric Power University Jilin 132012 P. R. China

ISBN: (纸本)9781509045839

This paper combines the regional pole placement technique with the geometric control theory to design the feedback control for the nonlinear wind turbine generator system (WTGS), which can improve the dynamic response efficiently. Through constructing the appropriate diffeomorphism and feedback linearization, the key variables of the original nonlinear WTGS can be remained in the transformed linear-form system, which sustains that the dynamic response could be adjusted in the transformed linear framework. Due to the multi-input multi-output (MIMO) and high-order characteristics, the regional pole placement technique is then applied on the feedback linearized WTGS, which can guarantee the limitation of several performances related to the dynamic response. In such a way, the dynamic response of WTGS can be adjusted through the feedback linearization and regional pole placement techniques. simulation results show the effectiveness of our results.

关键词： Feedback Linearization Nonlinear

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