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学者姓名：郑跃胜
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Abstract ：
Mixing helium and argon as the working gas of cold plasma jet is expected to combine the merits of He plasma jet and Ar plasma jet and has great potential for medical applications. For this reason, the discharge characteristics and reactive species diagnosis of a He + Ar + O2 plasma jet were studied in this paper. The result shows that the Penning effect between He and Ar is strongest when the volume fraction of Ar in the working gas is 10%, and the plasma jet propagates the longest distance. A low drive voltage and a wide pulse width will weaken the Penning effect between He and Ar, resulting in a decrease in the ionization efficiency of the plasma jet. Gelatin gel was used as the model human tissue, and the effective treatment area of He + Ar + O2 plasma jet on the model tissue increases with the volume fraction of Ar in the working gas. When the volume fraction of Ar is 50%, the effective treatment area of He + Ar + O2 plasma jet is 9 times that of He + O2 plasma jet, and the surface distribution of reactive oxygen species on the model tissue is almost uniform. Moreover, with the increase of volume fraction of Ar, the influence of the change of the plasma jet treatment angle on the surface distribution of reactive oxygen species is significantly weakened, indicating that He + Ar + O2 plasma jet can precisely control the reactive species dosage on the living tissue for clinical application. Graphical Abstract: (Figure presented.) © The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2024.
Keyword ：
Air Air Atmospheric pressure Atmospheric pressure Diagnosis Diagnosis Electric discharges Electric discharges Ionization of gases Ionization of gases Medical applications Medical applications Oxygen Oxygen Plasma jets Plasma jets Tissue Tissue Volume fraction Volume fraction
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| GB/T 7714 | He, Tongtong , Wang, Yunzheng , Chen, Zeyu et al. Discharge characteristics and reactive species diagnosis of a He + Ar + O2 plasma jet at atmospheric pressure [J]. | European Physical Journal D , 2024 , 78 (6) . |
| MLA | He, Tongtong et al. "Discharge characteristics and reactive species diagnosis of a He + Ar + O2 plasma jet at atmospheric pressure" . | European Physical Journal D 78 . 6 (2024) . |
| APA | He, Tongtong , Wang, Yunzheng , Chen, Zeyu , Zheng, Yuesheng . Discharge characteristics and reactive species diagnosis of a He + Ar + O2 plasma jet at atmospheric pressure . | European Physical Journal D , 2024 , 78 (6) . |
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As urbanization accelerates, substations have become a part of residential and downtown areas. The low-frequency noise generated by transformers has increasingly become a major source of complaints from neighboring residents. Due to the long wavelength of low-frequency noise, traditional passive noise reduction technology is bulky, expensive and limited in effectiveness. Active noise control (ANC) has gained attention due to its compact size, light weight, low cost, and excellent ability to reduce low-frequency noise. However, the precision of ANC relies on the control algorithm, and conventional least mean square-based algorithms still face challenges such as sluggish convergence, susceptibility to dispersion, and poor stability. In light of the time-varying characteristics of transformer noise, this paper proposes a machine learning-based algorithm for generating inverse noise waveform through time-series forecasting, and this approach aims to achieve rapid and stable noise reduction. The experimental result shows that the algorithm achieves noise reduction effects of 49.67 dB, and the time used for training and prediction is 1.78 s and 1.64 s, which shows a promising solution for transformer noise reduction. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
Keyword ：
Active noise control Active noise control Inverse problems Inverse problems Transformer substations Transformer substations
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| GB/T 7714 | Lin, Chuanjie , Zhu, Longyang , Lin, Xiaosi et al. Active Noise Control of Power Transformer Based on Time Series Forecasting [C] . 2024 : 413-428 . |
| MLA | Lin, Chuanjie et al. "Active Noise Control of Power Transformer Based on Time Series Forecasting" . (2024) : 413-428 . |
| APA | Lin, Chuanjie , Zhu, Longyang , Lin, Xiaosi , Chen, Yuwei , Chen, Hao , Chen, Hui et al. Active Noise Control of Power Transformer Based on Time Series Forecasting . (2024) : 413-428 . |
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Traditional polarimetric current-sensing methods contain many optical devices, leading to poor reliability. Also, their sensing output is distorted by massive system noise. To address these issues, this article presents a polarimetric current-sensing method using single-axis polarization encoding (SPE) and a dynamically decoding algorithm (DDA). A single-axis circulator (SAC) and a Faraday rotator mirror (FRM) are used to encode the measured current by light. The SPE only requires these two optical devices in the light-propagation path, enhancing the measurement reliability. The encoding process can significantly suppress the noise by eliminating high-order terms. To correctly restore the current signals, the light intensity is decoded by Jones-matrix analysis and dynamic parameters. Finally, normal currents, fault currents and harmonic currents in grids are used to test the performance of the presented method. The results show that the maximum amplitude error is smaller than 1.3% in a wide range of amplitudes, frequencies, temperatures, and vibrations, and the signal-to-noise ratio and number of devices required in the path are 51.43 dB and 2, respectively (those of the recently published polarimetric method are 1.7%, -4.24 dB, and 5, respectively).
Keyword ：
Current measurement Current measurement Decoding Decoding Distortion measurement Distortion measurement dynamically decoding dynamically decoding Noise Noise Optical variables measurement Optical variables measurement polarimetric polarimetric reliability reliability Sagnac interferometers Sagnac interferometers single-axis polarization encoding (SPE) single-axis polarization encoding (SPE) Temperature measurement Temperature measurement
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| GB/T 7714 | Jiang, Run , Zheng, Yuesheng , Chen, Duanyu et al. Current-Sensing Technology Using Single-Axis Polarization Encoding and Dynamically Decoding Algorithm [J]. | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT , 2024 , 73 . |
| MLA | Jiang, Run et al. "Current-Sensing Technology Using Single-Axis Polarization Encoding and Dynamically Decoding Algorithm" . | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 73 (2024) . |
| APA | Jiang, Run , Zheng, Yuesheng , Chen, Duanyu , Zhang, Hao . Current-Sensing Technology Using Single-Axis Polarization Encoding and Dynamically Decoding Algorithm . | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT , 2024 , 73 . |
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Abstract ：
In optical current sensing, existing polarimetric optical structures have relatively high measurement error and low signal-to-noise ratio. To resolve these challenges, this paper proposes an improved composite polarimetric structure with polarization offset (PO) and self-calibration demodulation. The proposed structure contains two single-polarization optical paths (SOPs), one of which incorporates PO to induce unidirectional changes in the polarization angle. In the SOP with PO, a waveform that matches the shape of the current waveform can be precisely obtained by demodulating the sensing output. Besides, in the SOP without PO, only the effective value of the current can be precisely obtained due to bidirectional changes in the polarization angle. Therefore, the current waveform can be calculated by self-calibration between the obtained results. The Jones-matrix derivation shows that the output of the improved structure has fewer noise terms and does not require approximation like existing structures. The test results reveal that the small-current error, large-current error and signal-to-noise ratio of the proposed structure have been improved to 0.8%, 0.2%, and 37.42 dB, respectively, compared to 1.00%, 0.5% and 30.45 dB of the state-of-the-art structures, and high-frequency fault currents are used to demonstrate the wide bandwidth of the proposed structure. © 2001-2012 IEEE.
Keyword ：
Current sensing Current sensing improved composite polarimetric structure improved composite polarimetric structure measurement error measurement error self-calibration demodulation self-calibration demodulation signal-to-noise ratio signal-to-noise ratio
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| GB/T 7714 | Jiang, R. , Zheng, Y. , Chen, D. . Improved Composite Optical Current Sensing with Polarization Offset and Self-Calibration Demodulation [J]. | IEEE Sensors Journal , 2024 , 25 (3) : 4676-4686 . |
| MLA | Jiang, R. et al. "Improved Composite Optical Current Sensing with Polarization Offset and Self-Calibration Demodulation" . | IEEE Sensors Journal 25 . 3 (2024) : 4676-4686 . |
| APA | Jiang, R. , Zheng, Y. , Chen, D. . Improved Composite Optical Current Sensing with Polarization Offset and Self-Calibration Demodulation . | IEEE Sensors Journal , 2024 , 25 (3) , 4676-4686 . |
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Nitrogen/Oxygen (N2/O2) mixtures are with good insulating properties and economic benefits, which are widely used in gas insulation for electric power equipment. The effective ionization coefficient as well as the breakdown voltage of N2/O2 mixture is related to the O2 component ratio. In this paper, the breakdown voltages of N2/O2 mixtures at high pressures in non-uniform electric fields are investigated. The applicability of Paschen's law in N2/O2 mixtures insulation under non-uniform electric fields is analyzed. An empirical formula for the breakdown voltages of N2/O2 mixtures is presented. The effect of the O2 component ratio on the breakdown characteristics at high pressures is also analyzed. When the electric field non-uniformity is high, the enhancement effect by the O2 component ratio on breakdown voltage is more significant. The breakdown voltage fluctuation is related to the O2 component ratio and the non-uniformity of electric field. © 2024 IEEE.
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| GB/T 7714 | Qi, R. , Zheng, Y. , Wang, Y. . Breakdown Characteristics of N2/O2 Mixtures at High Pressures in Alternating Non-Uniform Electric Fields [未知]. |
| MLA | Qi, R. et al. "Breakdown Characteristics of N2/O2 Mixtures at High Pressures in Alternating Non-Uniform Electric Fields" [未知]. |
| APA | Qi, R. , Zheng, Y. , Wang, Y. . Breakdown Characteristics of N2/O2 Mixtures at High Pressures in Alternating Non-Uniform Electric Fields [未知]. |
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Abstract ：
Mixing helium and argon as the working gas of cold plasma jet is expected to combine the merits of He plasma jet and Ar plasma jet and has great potential for medical applications. For this reason, the discharge characteristics and reactive species diagnosis of a He + Ar + O-2 plasma jet were studied in this paper. The result shows that the Penning effect between He and Ar is strongest when the volume fraction of Ar in the working gas is 10%, and the plasma jet propagates the longest distance. A low drive voltage and a wide pulse width will weaken the Penning effect between He and Ar, resulting in a decrease in the ionization efficiency of the plasma jet. Gelatin gel was used as the model human tissue, and the effective treatment area of He + Ar + O-2 plasma jet on the model tissue increases with the volume fraction of Ar in the working gas. When the volume fraction of Ar is 50%, the effective treatment area of He + Ar + O-2 plasma jet is 9 times that of He + O-2 plasma jet, and the surface distribution of reactive oxygen species on the model tissue is almost uniform. Moreover, with the increase of volume fraction of Ar, the influence of the change of the plasma jet treatment angle on the surface distribution of reactive oxygen species is significantly weakened, indicating that He + Ar + O-2 plasma jet can precisely control the reactive species dosage on the living tissue for clinical application.
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| GB/T 7714 | He, Tongtong , Wang, Yunzheng , Chen, Zeyu et al. Discharge characteristics and reactive species diagnosis of a He + Ar + O2 plasma jet at atmospheric pressure [J]. | EUROPEAN PHYSICAL JOURNAL D , 2024 , 78 (6) . |
| MLA | He, Tongtong et al. "Discharge characteristics and reactive species diagnosis of a He + Ar + O2 plasma jet at atmospheric pressure" . | EUROPEAN PHYSICAL JOURNAL D 78 . 6 (2024) . |
| APA | He, Tongtong , Wang, Yunzheng , Chen, Zeyu , Zheng, Yuesheng . Discharge characteristics and reactive species diagnosis of a He + Ar + O2 plasma jet at atmospheric pressure . | EUROPEAN PHYSICAL JOURNAL D , 2024 , 78 (6) . |
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In practical engineering, there are combined air gaps formed by floating conductors, which exhibit more complex discharge characteristics compared to air gaps. This paper conducts AC voltage discharge experiments on floating conductors with different diameters and lengths under different electrode structures and combines with electric field simulation for analysis. In the rod-plane gap and small sphere- plane gap, the breakdown voltage curves show an initial increase followed by a decrease as the floating conductor moves away from the high voltage electrode. For the large sphere-plane gap, the breakdown voltage curve shows an increasing trend, and the phenomenon of the discharge the sub-gap between floating conductors occurs when the conductors are near the high voltage electrode, thereby influencing the breakdown voltage. © 2024 IEEE.
Keyword ：
AC voltage AC voltage breakdown characteristics breakdown characteristics combined air gap combined air gap electrode radius electrode radius floating conductor floating conductor
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| GB/T 7714 | Luo, Y. , Liu, Z. , Zheng, Y. . AC Breakdown Characteristics of Combined Air Gap with Floating Conductor [未知]. |
| MLA | Luo, Y. et al. "AC Breakdown Characteristics of Combined Air Gap with Floating Conductor" [未知]. |
| APA | Luo, Y. , Liu, Z. , Zheng, Y. . AC Breakdown Characteristics of Combined Air Gap with Floating Conductor [未知]. |
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With the development of the power grid at high altitudes, more and more transmission and transformation projects are being implemented at altitudes close to 5000 meters. As the altitude increases, the air pressure decreases, resulting in a decrease in the insulation performance of the air gap and requiring corresponding adjustments to the insulation structure of power equipment. This paper investigated the AC breakdown characteristics of air in non-uniform electric fields at pressures of 50100 kPa. The relationship between maximum breakdown field strength and electric field non-uniformity factor at different pressures was analyzed. The applicability of streamer criterion in low-pressure air gap was also analyzed. The results show that the breakdown voltage increases with increasing pressure and electrode distance for different electrode radius. At the same air pressure, the maximum breakdown field strength increases with the decrease of the electrode radius. When the electrode radius r ≥ 1.0 cm, the streamer criterion can accurately calculate the breakdown voltage of short air gaps at low pressures. © 2024 IEEE.
Keyword ：
breakdown field strength breakdown field strength breakdown voltage breakdown voltage low pressure low pressure non-uniform electric field non-uniform electric field streamer criterion streamer criterion
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| GB/T 7714 | Liu, Z. , Wang, Y. , Zheng, Y. . AC Breakdown Characteristics of Air in Non-Uniform Electric Fields at Low-Pressure Conditions [未知]. |
| MLA | Liu, Z. et al. "AC Breakdown Characteristics of Air in Non-Uniform Electric Fields at Low-Pressure Conditions" [未知]. |
| APA | Liu, Z. , Wang, Y. , Zheng, Y. . AC Breakdown Characteristics of Air in Non-Uniform Electric Fields at Low-Pressure Conditions [未知]. |
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Low-current measurement is a challenging task for polarimetric fiber-optic current-sensing (FOCS) systems due to low signal-to-noise ratio (SNR) and sensitivity to current (STC). To tackle the challenges, this article proposes a FOCS approach on bias-added measurement and main-component reconstruction. To enhance STC, the adopted FOCS structure is based on bias-added measurement using a bias-current coil and a single-axis working circulator instead of traditional polarizers. However, the unavoidable noise would decrease the SNR of FOCS output. An algorithm of main-component reconstruction is presented to filter out the noise. The main-component distribution of the FOCS output is analyzed by a feature vector based on the spectral subzones. Using an appropriate threshold, the subzones with prominent features are self-adaptively decomposed to extract the main components by fast matrix decomposition. At last, the main components are adopted to reconstruct the FOCS signal. In comparison with other reflective methods, the experimental data suggest that the STC and SNR of the proposed approach can be increased by 200% and 22%, respectively. The similarity between the expected and reconstructed signals reaches 0.9993 under the premise of a small measurement error.
Keyword ：
Bias-added measurement Bias-added measurement Current measurement Current measurement Feature extraction Feature extraction fiber-optic current sensing (FOCS) fiber-optic current sensing (FOCS) main-component reconstruction main-component reconstruction Noise Noise Noise measurement Noise measurement Optical fiber sensors Optical fiber sensors Photodetectors Photodetectors sensitivity to current (STC) sensitivity to current (STC) Sensors Sensors signal-to-noise ratio (SNR) signal-to-noise ratio (SNR)
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| GB/T 7714 | Jiang, Run , Zheng, Yuesheng , Chen, Duanyu et al. Optical Current Sensing Based on Bias-Added Measurement and Main-Component Reconstruction [J]. | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT , 2024 , 73 . |
| MLA | Jiang, Run et al. "Optical Current Sensing Based on Bias-Added Measurement and Main-Component Reconstruction" . | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 73 (2024) . |
| APA | Jiang, Run , Zheng, Yuesheng , Chen, Duanyu , Zhang, Hao . Optical Current Sensing Based on Bias-Added Measurement and Main-Component Reconstruction . | IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT , 2024 , 73 . |
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Mixing helium and argon as the working gas of cold plasma jet is expected to combine the advantages of helium plasma jet and argon plasma jet. Surface distributions of ROS on model tissue treated by a He+Ar+O2 plasma jet were investigated in this study. The results show that the effective treatment area of He+Ar+O2 plasma jet on model tissue increases with the argon volume fraction in the working gas. When the argon volume fraction was 60%, the effective treatment area of the He+Ar+O2 plasma jet is 9 times greater than that of the He+O2 plasma jet, and the surface distribution uniformity of ROS on model tissue is even greater than that of Ar+O2 plasma jet. Furthermore, mixing helium and argon as the working gas of the plasma jet diminishes the effect caused by variations in the treatment angle of the plasma jet, maintaining the effective treatment area of the plasma jet directly below the jet nozzle. These results suggest that He+Ar+O2 plasma jet is advantageous for precisely controlling the dosage of ROS in clinical applications. © 2024 IEEE.
Keyword ：
cold plasma jet cold plasma jet model tissue model tissue reactive oxygen species reactive oxygen species surface distribution surface distribution
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| GB/T 7714 | Wang, Y. , Song, L. , He, T. et al. Surface Distributions of ROS on Model Tissue Treated by a He+Ar+O2 Plasma Jet [未知]. |
| MLA | Wang, Y. et al. "Surface Distributions of ROS on Model Tissue Treated by a He+Ar+O2 Plasma Jet" [未知]. |
| APA | Wang, Y. , Song, L. , He, T. , Zheng, Y. . Surface Distributions of ROS on Model Tissue Treated by a He+Ar+O2 Plasma Jet [未知]. |
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