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Anodal transcranial direct current stimulation (tDCS) over the left DLPFC improves emotion regulation

Michel Hansenne Emilie Weets
Polish Psychological Bulletin | 2020 | vol. 51 | No 1 | 37-43 | DOI: 10.24425/ppb.2020.132653
Keywords emotion regulation transcranial direct current stimulation DLPFC
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Abstract

The study of emotion regulation constitutes a major area of research for having a complete picture of human emotional experience, and several lines of evidence claim that poor emotion regulation skills are particularly deleterious in different aspects of life. Previous tDCS studies have suggested the beneficial role of DLPFC stimulation to improve emotion processing and regulation. The present study was therefore conducted to confirm and extend the effects of DLPFC stimulation on emotion regulation by including both positive and negative emotional material. In this between subjects study, participants were randomly assigned to receive active or sham stimulation over the left DLPFC. Participants viewed negative, positive, and neutral pictures while attempting to decrease, increase, or not modulate their emotional reactions. Subjective reactions were assessed via on-line ratings. The main results show that anodal tDCS stimulation over the left DLPFC slightly improves the ability to increase emotion perception for positive emotions. More interestingly, the results demonstrate that tDCS enhances the regulation of both positive and negative emotions when the baseline is considered. This study provides additional data on the use of tDCS as a tool to increase emotion regulation not only for negative affective material, but also for positive ones.

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Authors and Affiliations

Michel Hansenne
Emilie Weets

Research on Distribution and Morphology of Primary Si Under the Effect of Direct Current

Jiayan Li Benson Kihono Njuguna Ping Ni Liang Wang Yi Tan
Archives of Metallurgy and Materials | 2021 | vol. 66 | No 2 | 367-372 | DOI: 10.24425/amm.2021.135867
Keywords Silicon source direct current Joule heating Si morphology Fe impurity
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Abstract

A source of pure silicon was added into an alloy refining system during a refining process with the application of a direct electric current. The effect of the temperature difference between the graphite electrodes and the alloy was decreased. The temperature increase value (ΔT) of the Al-28.51wt.%Si alloy sample caused by Joule heating was calculated by weighing the mass of primary silicon. When the current density was 5.0×105 A/m2, the overall temperature increase in the alloy was about 90°C regardless of the alloy composition. Adequate silicon atoms recorded the footprint of the electric current in the alloy melt. The flow convection generated by the electric current in the melt during the solidification process resulted in the refinement of primary silicon. The Fe impurity content in alloy refining without the electric current density was 2.16 ppm. However, it decreased to 1.27 ppmw with the application of an electric current density of 5.0×105 A/m2.
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Authors and Affiliations

Jiayan Li
1 2
Benson Kihono Njuguna
1 2
Ping Ni
1 2
Liang Wang
2 1
Yi Tan
1 2
  1. Dalian University of Technology, School of Materials Science and Engineering, No. 2 Linggong Road, Ganjingzi District, Dalian 116023, China
  2. Dalian University of Technology, Key Laboratory for Solar Energy Photovoltaic System of Liaoning Province, Dalian 116024, China

Experimental study on fault ride-through capability of VSC-based HVDC transmission system

Ngo Minh Khoa Nguyen An Toan Doan Duc Tung
Archives of Electrical Engineering | 2021 | vol. 70 | No 1 | 37-51 | DOI: 10.24425/aee.2021.136051
Keywords converter system experimental waveform fault ride-through high-voltage direct current voltage sag
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Abstract

For voltage-source-converter based high-voltage-direct-current (VSC-HVDC) transmission systems, fault ride-through (FRT) capability is a very important grid requirement in order to enhance its operational availability under an alternating current (AC) grid fault condition. Voltage sags during a short-circuit fault in power transmission lines can lead to fluctuations in the direct current (DC) link voltage of converter systems, and may induce reversed power flow and even trip a VSC-HVDC transmission system. A practical method is developed in this paper for investigating FRT capability of VSC-HVDC transmission system characteristics during a voltage sag event using experimental results from Smart Grid Laboratory. Symmetrical and asymmetrical voltage sag events with different remaining voltages are applied to an AC grid that lasts with a variable duration. The experimental waveforms of the two converter systems are recorded and analyzed in order to evaluate the FRT capability of VSC-HVDC transmission systems.
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Bibliography

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[24] Li C., Li Y., Guo J., He P., Research on emergency DC power support coordinated control for hybrid multi-infeed HVDC system, Archives of Electrical Engineering, vol. 69, no. 1, pp. 5–21 (2020).
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Authors and Affiliations

Ngo Minh Khoa
1
ORCID: ORCID
Nguyen An Toan
1
ORCID: ORCID
Doan Duc Tung
1
ORCID: ORCID
  1. Faculty of Engineering and Technology, Quynhon University, Vietnam

Ultra-fast hybrid systems for protecting direct current circuits with high magnetic energy

Marek Bartosik Piotr Borkowski Franciszek Wójcik
Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 2 | e136743 | DOI: 10.24425/bpasts.2021.136743
Keywords DC direct current superconducting coils quench electromagnets protection DC switches ultra-fast switches hybrid switches vacuum switches DC electric traction
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Abstract

The article presents a new generation of ultra-fast hybrid switching systems (USH) for reliable, ultra-fast protection of various medium and low voltage DC systems (MVDC and LVDC). The DC switch-off takes place in a vacuum chamber (VC) cooperating with a semiconductor module using current commutation of natural or forced type. Against the background of the current state of science and technology, the paper depicts the basic scopes of USH applications and their particular suitability for operation in high magnetic energy DC circuits. In the case of DC system failures, this magnetic energy should be dissipated outside the system as soon as possible. Usually, magnetic blow-out switches (MBOS) with relatively low operating speed are used for this purpose. The article describes the theoretical basis and principles of construction of two types of novel USH systems: a direct current switching system (DCSS) and a direct current ultra-fast hybrid modular switch (DCU-HM). The DCSS family is designed for quench protection of superconducting electromagnets’ coils in all areas of application. The DCU-HM family is designed for the protection of all systems or vehicles of DC electrical traction and for related industrial applications. The conducted comparative analysis of the effectiveness of USH with respect to MBOS shows clear technical advantages of the new generation switching systems over MBOS. List of abbreviations used in the article is provided at the end.
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Bibliography

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  22. [22]  The applicable standards: PN-EN 50121-3-2, PN-EN 50123-1,PN-EN 50123-2, PN EN 50123-5, PN-EN 50124-1, PN-EN 50153, PN-EN 50155, PN-EN 50163, PN-EN 60068-1 (also: 60068-2-1, 60068-2-2, 60068-2-52), PN-EN 60077-1 (also: 60077-2), PN-EN 60077-3, PN- EN 60529, UIC Charter 550/1997.
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Authors and Affiliations

Marek Bartosik
1
Piotr Borkowski
1
ORCID: ORCID
Franciszek Wójcik
1
  1. Lodz University of Technology, Department of Electrical Apparatus (DEA TUL), 116 Zeromskiego Street, 90-924 Lodz, Poland

Subsynchronous oscillation and its mitigation of VSC-MTDC with doubly-fed induction generator-based wind farm integration

Miaohong Su Haiying Dong Kaiqi Liu Weiwei Zou
Archives of Electrical Engineering | 2021 | vol. 70 | No 1 | 53-72 | DOI: 10.24425/aee.2021.136052
Keywords doubly-fed induction generator eigenvalue analysis multi-channel variable parameter subsynchronous damping controller subsynchronous oscillation voltage source converter based multi-terminal direct current transmission system
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Abstract

Wind power integration through the voltage source converter-based high-voltage direct current (VSC-HVDC) system will be a potential solution for delivering large-scale wind power to the “Three-North Regions” of China. However, the interaction between the doubly-fed induction generator (DFIG) and VSC-HVDC system may cause the risk of subsynchronous oscillation (SSO). This paper establishes a small-signal model of the VSC based multi-terminal direct current (VSC-MTDC) system with new energy access for the problem, and the influencing factors causing SSO are analyzed based on the eigenvalue analysis method. The theoretical analysis results show that the SSO in the system is related to the wind farm operating conditions, the rotor-side controller (RSC) of the DFIG and the interaction of the controller in the VSC-MTDC system. Then, the phase lag characteristic is obtained based on the signal test method, and a multi-channel variable-parameter subsynchronous damping controller (SSDC) is designed via selecting reasonable parameters. Finally, the correctness of the theoretical analysis and the effectiveness of the multi-channel variable-parameter SSDC are verified based on time-domain simulation.
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Authors and Affiliations

Miaohong Su
1
ORCID: ORCID
Haiying Dong
1 2
Kaiqi Liu
1
Weiwei Zou
1
  1. School of Automatic and Electrical Engineering, Lanzhou Jiaotong University, China
  2. School of New Energy and Power Engineering, Lanzhou Jiaotong University, China

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