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1.3-μm 4×25-Gb/s hybrid integrated TOSA and ROSA

Frontiers of Information technology & Electronic Engineering 2019年第4期20卷 490-497页

作者： Yu LIU Hao-tian BAO Yi-ming ZHANG Zhi-ke ZHANG Yun-shan ZHANG Xiang-fei CHEN Jun LU Yue-chun SHI Jia-shun ZHANG Liang-liang WANG Jun-ming AN Ning-hua ZHU State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences School of Electronic Electrical and Communication Engineering University of Chinese Academy of Sciences State Key Laboratory of Advanced Optical Communications System and Networks School of Electronics Engineering and Computer Science Peking University Microwave-Photonics Technology Laboratory College of Engineering and Applied Sciences Nanjing University

The design and fabrication of a compact and low-cost 4×25-Gb/s transmitter optical sub-assembly(TOSA) and receiver optical sub-assembly(ROSA) using a hybrid integrated technique are reported. TOSA and ROSA are developed without thermoelectric cooler for coarse wavelength division multiplexing applications. Physical dimension of the packaged optical subassembly is limited to 11.5 mm×5.4 mm×5.4 mm. The design of TOSA and ROSA is employed using a silica-based arrayed waveguide grating chip to select the specific channel wavelength at O-band. In TOSA, the wavelength of four 1.3-μm discrete directly modulated laser chips is well controlled based on the reconstruction equivalent chirp technique. In the back-to-back transmission test, bit error rates for all lanes of cascade of the TOSA and ROSA are small. A clear opening eye diagram is obtained.

关键词： Reconstruction equivalent chirp Arrayed waveguide grating Transmitter optical subassembly Hybrid integrated

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Controlled preparation of MOF for performance improvement of vegetable insulating oil 7

Controlled preparation of MOF for performance improvement of...

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7th IEEE International Conference on High Voltage Engineering and Application, ICHVE 2020

作者： Zhao, Haonan Huang, Zhengyong Li, Jian Yao, Degui State Key Laboratory of Power Transmission Equipment System Security and New Technology Chongqing University Chongqing400044 China Henan Electric Power Research Institute State Grid Henan Electric Power CO. Ltd Zhengzhou450000 China

ISBN: (纸本)9781728155111

Vegetable insulating oil is a common kind of synthetic liquid insulating medium, which is usually applied in high voltage electrical equipment, such as transformers. At present, some mineral insulating oil has already been replaced by the eco-friendly vegetable insulating oil. Typically, the eco-friendly vegetable insulating oil not only possesses good electrical performances but also owns great biodegradability and high flash point. However, there will be impurities in any kind of vegetable insulating oil inevitably, and those impurities will have a serious influence on the properties of insulating oil. Metal-organic framework (MOF) has potential to be used as adsorbent because of its special micropore structure and large specific surface area. Meanwhile, it is convenient to prepare various of MOFs and control their structures. Nowadays, MOFs are usually used in the field of medicine delivery, chemical catalysis and gas adsorption. Nevertheless, utilizing MOF as a kind of adsorbent in vegetable insulating oil is seldom reported. In this paper, a typical MOF named zeolitic imidazolate framework-67 (ZIF-67) was prepared and used in the research. The microstructure of ZIF-67 was observed under the scanning electron microscope (SEM). The chemical properties of ZIF-67 were characterized by the X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). Also, ZIF-67 was used as an adsorbent to treat the aged vegetable insulating oil. Results showed that the dielectric loss of aged vegetable insulating oil can be reduced by 46.7%, and the water and acid value of the aged vegetable insulating oil could be decreased gently at the same time. This approach provides a possible solution to improve the performance of vegetable insulating oil for the high voltage electrical system. © 2020 IEEE.

关键词： Scanning electron microscopy

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Research on correlation analysis of vibration signals at multiple measuring points and black box model of flexible-DC transformer 4

Research on correlation analysis of vibration signals at mul...

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4th IEEE Conference on Energy Internet and Energy system Integration, EI2 2020

作者： Pan, Zhicheng Deng, Jun Chu, Jinwei Zhang, Zhanlong Dong, Zijian China Southern Power Grid Maintenance Test Center of EHV Power Transmission Company Guangzhou China Chongqing University State Key Laboratory of Power Transmission Equipment System Security and New Technology Chongqing China

ISBN: (纸本)9781728196060

The internal structure of the flexible-DC transformer is complicated and the lack of a reliable vibration calculation model limits the application of the vibration analysis method in the fault diagnosis of the flexible-DC transformer. In response to this problem, this paper analyzes the correlation between the vibration signals of multiple measuring points and establishes a 'black box' model of transformer vibration detection. Using the correlation analysis of multiple measuring points and BP neural network, a 'black box' model that simulates the internal vibration transmission relationship of the transformer is established. The vibration signal of the multiple measuring points can be used to calculate the vibration signal of the target measuring point under specific working conditions. This can provide effective information for fault diagnosis and judgment of the running status of the flexible-DC transformer. © 2020 IEEE.

关键词： Failure analysis

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Generation expansion planning considering efficient linear EENS formulation

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Global Energy Interconnection 2021年第3期4卷 273-284页

作者： Donglei Sun Zhijie Zheng Shuai Liu Mingqiang Wang Yi Sun Dong Liu Economic&Technology Research Institute State Grid Shandong Electric Power CompanyJinan 250021Shandong ProvinceP.R China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong UniversityJinan 250061Shandong ProvinceP.R China ELSEVIER

Power system equipment outages are one of the most important factors affecting the reliability and economy of power *** is crucial to consider the reliability of the planning *** this paper,a generation expansion planning(GEP)model is proposed,in which the candidate generating units and energy storage systems(ESSs)are simultaneously planned by minimizing the cost incurred on investment,operation,reserve,and *** reliability cost is computed by multiplying the value of lost load(VOLL)with the expected energy not supplied(EENS),and this model makes a compromise between economy and *** the computation of EENS makes the major computation impediment of the entire model,a new efficient linear EENS formulation is proposed and applied in a multi-step GEP *** doing so,the computation efficiency is significantly improved,and the solution accuracy is still *** proposed GEP model is illustrated using the IEEE-RTS system to validate the effectiveness and superiority of the new model.

关键词： Expected energy not supplied Generation expansion planning Linearization methods

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state Evaluation of Superconducting Current Limiters Based on Fuzzy Layered Method

State Evaluation of Superconducting Current Limiters Based o...

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2020 IEEE Sustainable Power and Energy Conference, iSPEC 2020

作者： Hei, Yingdun Zhou, Xingmei Tan, Yaxiong Pan, Jiajun Tian, Chuyu Chen, Wei Yunnan Electric Power Research Institute Yunnan Power Grid Co. Ltd Kunming China State Key Laboratory of Power Transmission Equipment System Security New Technology Chongqing University Chongqing China

ISBN: (纸本)9781728191645

The superconducting current limiter is a key electrical equipment to limit fault current in power system, which can quickly limit short-circuit current in the event of a short-circuit fault. The coordinated matching operation of the superconducting DC current limiter and the high-voltage DC circuit breaker solves the problem that the DC side fault is difficult to clear quickly, and promotes the development of the future multi-terminal DC transmission system and DC networking technology. This paper presents indicators selection and weight calculation for condition evaluation of superconducting fault current limiter. Superconducting fault current limiter theory and structure are given to introduce the current limiter. Then condition monitoring of superconducting fault current limiter was analyzed, which involving state, operating, control parameters. Condition evaluation system of superconducting fault current limiter is obtained, according to condition evaluation principle. Weights of the condition indicators are calculated by improved analytic hierarchy process approach. Also the condition evaluation approach based on fuzzy theory is presented. The proposed approach is of great significance to the operation of the superconducting fault current limiter. © 2020 IEEE.

关键词： Superconducting fault current limiters

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Power Consumption Characteristics Research on Mobile system of Electrically Driven Large-Load-Ratio Six-Legged Robot

Research Square

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Research Square 2021年

作者： Zhuang, Hong-Chao Wang, Ning Gao, Hai-Bo Deng, Zong-Quan School of Mechanical Engineering Tianjin University of Technology and Education Tianjin300222 China School of Information Technology Engineering Tianjin University of Technology and Education Tianjin300222 China State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin150001 China

To research the power consumption characteristics of mobile system of an electrically driven large-load-ratio six-legged robot with engineering capability is beneficial to speed up it toward practicability. Based on the configuration and walking modes of robot, the mathematical model of the power consumption of mobile system is set up. In view of the tripod gait is often selected for the six-legged robots, the simplified power consumption model of mobile system under the tripod gait is established by means of reducing the dimension of the robot's statically indeterminate problem and constructing the equal force distribution. Then, the power consumption of robot mobile system is solved under different working conditions. The variable tendencies of the power consumption of robot mobile system are respectively obtained with changes in the rotational angles of hip joint and knee joint, body height, and span. The articulated rotational zones and the ranges of body height and span are determined under the lowest power consumption. According to the walking experiments of prototype, the variable tendencies of the average power consumption of robot mobile system are respectively acquired with changes in the duty ratio, body height, and span. Then, the feasibility and correctness of theory analysis are verified in the power consumption of robot mobile system. The proposed analysis method in this paper can provide a reference on the lower power research of the large-load-ratio multi-legged robots. © 2021, CC BY.

关键词： Electric power utilization

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Erratum: ‘Scattering of SH Waves Around Circular Canyon in Inhomogeneous Wedge Space’

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Geophysical Journal International 2021年第1期226卷 345-350页

作者： Zailin Yang Xinzhu Li Yunqiu Song Guanxixi Jiang Menghan Sun Xueqian Fang College of Aerospace and Civil Engineering Harbin Engineering University Harbin China Key Laboratory of Advanced Material of Ship and Mechanics Ministry of Industry and Information Technology Harbin Engineering University Harbin China sunmenghan163@*** State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao University Shijiazhuang China

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An investigation on laser-induced damage resistance of KDP optics repaired by different micro-milling strategies 20

An investigation on laser-induced damage resistance of KDP o...

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20th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2020

作者： Liu, Qi Cheng, Jian Yang, Hao Zhao, Linjie Tan, Chao Chen, Mingjun State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin150001 China Machining and Condition Monitoring Group Faculty of Engineering University of Nottingham NG7 2RD United Kingdom

ISBN: (纸本)9780995775176

Although micro-milling has been regarded as the most promising method to repair the micro-defects on KH2PO4 (KDP) optics surfaces, residual tool marks are inevitably generated on the repaired surfaces and would pose a direct impact on the laser-induced damage (LID) threshold of repaired KDP optics. In this work, a residual tool marks model was developed to characterize the repaired surface morphologies processed by different milling strategies (e.g. layer-milling and spiral-milling strategies). Then the predicted tool marks were utilized to built a light-filed intensity modulation model to reveal the relationship between the residual tool marks and its related optical performance. The practical of LID tests well verified the simulation results. It was revealed that the milling strategies indeed have a significant influence on the ultimate LID resistance of KDP optics after repair through impacting the generation of residual tool marks. The spiral-milling method with a smaller path interval can produce a laser-friendly repaired surfaces, which have a equivalent laser-induced resistance with the original fly cutitng surface, while the layer-milling method has a higher machining efficiency. Therefore, an optimized repair procedure, adopting layer-milling path as rough milling and spiral-milling as fine milling, was proposed for pratical engineering application in ICF facilities in the future. Copyright © Proceedings of the 20th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2020. All rights reserved.

关键词： Milling (machining)

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Correction: Backbone resonance assignment of the catalytic and ATP-binding domain of CpxA from Escherichia coli

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Biomolecular NMR assignments 2025年第1期19卷 2025 Mar 25页

作者： Jing Deng Guofang Zeng Wenqing Xia Wei Tang Zhaofei Chai Yixiang Liu Conggang Li Liqun Huang Ling Jiang HitGen Inc Shuangliu District Chengdu Sichuan 610200 P.R. China. Key Laboratory of Magnetic Resonance in Biological System State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Innovation Academy for Precision Measurement Science and Technology National Center for Magnetic Resonance in Wuhan Chinese Academy of Sciences Wuhan 430071 China. University of Chinese Academy of Sciences Beijing 100049 China. Key Laboratory of Magnetic Resonance in Biological System State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Innovation Academy for Precision Measurement Science and Technology National Center for Magnetic Resonance in Wuhan Chinese Academy of Sciences Wuhan 430071 China. liqunh@***. Key Laboratory of Magnetic Resonance in Biological System State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Innovation Academy for Precision Measurement Science and Technology National Center for Magnetic Resonance in Wuhan Chinese Academy of Sciences Wuhan 430071 China. lingjiang@***.

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Development of FBG Transformer Vibration Sensor Based on Cantilever Beam Structure

Development of FBG Transformer Vibration Sensor Based on Can...

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Advanced Electrical Equipment and Reliable Operation (AEERO), International Conference on

作者： Guochao Qian Qingjun Peng Zhixian Zhang Meng Li Kejie Wu Yuxuan Song State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Electric Power Research Institute of Yunnan Power Grid Co.Ltd Kunming Yunnan China Electric Power Research Institute of Yunnan Power Grid Co. Ltd Kunming Yunnan China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China

ISBN: (纸本)9781665402651

Power transformer is the core equipment of the power network, and vibration detection is an important technical means to analyze the mechanical state of the inner winding and iron core of the transformer. Compared with the traditional vibration sensor, the optical fiber vibration sensor has the advantages of anti-electromagnetic interference, easy reuse and high sensitivity. This paper designed a FBG vibration sensor based on the structure of cantilever beam, and based on the theory analysis and COMSOL simulation design the sensor structure vibration picking, improves the sensor sensitivity of low frequency vibration of transformer, set the edge spectrum of fiber grating demodulation system, simplifying the system structure, has realized the sensing of low frequency vibration signal. Based on the shaking table, the measured resonant frequency of the sensor is 180Hz, and the sensitivity at the resonant point is 14.09V/g. The sensor has good linearity at 100 Hz and can detect vibration signals lower than 0.0176g.

关键词： Vibrations Analytical models Optical fiber sensors Sensitivity Resonant frequency Transformer cores Fiber gratings

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