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The influence of back-breakdown on the CO2 conversion in gliding arc plasma: based on experiments of different materials and improved structures EI SCIE
期刊论文 | 2021 , 54 (49) | JOURNAL OF PHYSICS D-APPLIED PHYSICS
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Abstract :

In this work, we studied the influence of electrode materials and airflow area on CO2 conversion in gliding arc plasma. Herein, the correlation between breakdown events, including back-breakdown and re-ignition, and conversion rate was discussed. The experimental results show that the motion characteristics of the gliding arc when using different electrode materials affect the CO2 conversion, especially the energy efficiency. Thereinto, the graphite material has the best performance. The correlation coefficient between breakdown events and the conversion rate reaches 0.85 at 4 l min(-1). Furthermore, the experiment of changing the airflow area verifies this value. Changing the airflow area increases the proportion of gas passing through the gliding arc, which can improve the CO2 conversion, especially at low flow rate. When the flow rate is 3 l min(-1), the conversion rate reaches 11.1%, which is much higher than the conversion rate before improvement.

Keyword :

CO2 conversion breakdown events graphite motion characteristics gliding arc

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GB/T 7714 Sun, Hao , Chen, Zhuolei , Chen, Jiefu et al. The influence of back-breakdown on the CO2 conversion in gliding arc plasma: based on experiments of different materials and improved structures [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2021 , 54 (49) .
MLA Sun, Hao et al. "The influence of back-breakdown on the CO2 conversion in gliding arc plasma: based on experiments of different materials and improved structures" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 54 . 49 (2021) .
APA Sun, Hao , Chen, Zhuolei , Chen, Jiefu , Long, Hu , Wu, Yi , Zhou, Wenliang . The influence of back-breakdown on the CO2 conversion in gliding arc plasma: based on experiments of different materials and improved structures . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2021 , 54 (49) .
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A Load-Dependent Model of Triboelectric Nanogenerators for Surface Roughness Sensing EI SCIE
期刊论文 | 2021 , 21 (18) , 20220-20228 | IEEE SENSORS JOURNAL
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Abstract :

The triboelectric nanogenerator (TENG) has the advantages of low cost, high efficiency, flexibility, lightness, and portability. Therefore, it has caused more and more attention as an electronic skin sensor. Generally, the research on intelligent components mainly focused on flexible pressure or temperature sensors. However, the surface roughness recognition of object material still remains a challenge. Meanwhile, most of the current surface roughness recognition methods need secondary processing of the sensor signal, and rarely use the signal generated by the sensor to directly identify the surface roughness. In this paper, the load-dependent electric field model is transplanted to the conductor-dielectric contact-separation TENG (CS-TENG), and the surface roughness of conductor can be differentiated theoretically based on the output of CS-TENG. To verify its effectiveness, the TENG devices were fabricated and the home-processed steels of different roughness act as the conductor layers. By contacting the conductor layer with the dielectric layer, the electric output signal based on contact induced electrification can be generated, which can be used to quantitatively estimate the surface roughness of steels. The test results demonstrate that the output of CS-TENG decreases with the increase of surface roughness, which coincides with the simulation prediction. This method is low cost and easy to implement, which provides a new design idea to extend the functions of TENGs as tactile electronic skins.

Keyword :

Sensors load-dependent electric field Triboelectric nanogenerator Conductors Electrodes contact mechanics Rough surfaces Steel Surface roughness tactile electronic skin surface roughness Load modeling

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GB/T 7714 Wen, Jian , Niu, Chunping , He, Hailong et al. A Load-Dependent Model of Triboelectric Nanogenerators for Surface Roughness Sensing [J]. | IEEE SENSORS JOURNAL , 2021 , 21 (18) : 20220-20228 .
MLA Wen, Jian et al. "A Load-Dependent Model of Triboelectric Nanogenerators for Surface Roughness Sensing" . | IEEE SENSORS JOURNAL 21 . 18 (2021) : 20220-20228 .
APA Wen, Jian , Niu, Chunping , He, Hailong , Han, Weilong , Zhong, Yilin , Wu, Yi . A Load-Dependent Model of Triboelectric Nanogenerators for Surface Roughness Sensing . | IEEE SENSORS JOURNAL , 2021 , 21 (18) , 20220-20228 .
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High-Capacity MVDC Interruption Based on IGCT Current Sharing Integrated With Freewheeling EI SCIE
期刊论文 | 2021 , 68 (11) , 10982-10991 | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
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Abstract :

Medium-voltage dc (MVdc) distribution systems have the advantages of high power density, low line loss and fast system response. However, the high rise rate and large peak value of short circuit current make the fault current interruption a critical problem in MVdc systems. To solve this problem, a novel circuit breaker scheme based on integrated gate-commutated thyristor (IGCTs) current sharing integrated with freewheeling is proposed in this article, which not only can ensure a high breaking capacity and short interruption time in the full current range, but also have superior vacuum interrupter recovery performance and high breaking reliability. The analysis of key factors, including stray parameters, inductance-capacitance (LC) parameters and arcing time, on the current commutation characteristics is presented, and the optimal design principle of the circuit breaker parameters is obtained. Finally, the proposed MVdc circuit breaker is verified with a 64.2 kA/10 kV fault current interruption experiment.

Keyword :

DC circuit breakers (DCCB) integrated gate-commutated thyristor (IGCT) stray parameter optimization large capacity interruption

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GB/T 7714 Xiao, Yu , Wu, Yifei , Wu, Yi et al. High-Capacity MVDC Interruption Based on IGCT Current Sharing Integrated With Freewheeling [J]. | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2021 , 68 (11) : 10982-10991 .
MLA Xiao, Yu et al. "High-Capacity MVDC Interruption Based on IGCT Current Sharing Integrated With Freewheeling" . | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 68 . 11 (2021) : 10982-10991 .
APA Xiao, Yu , Wu, Yifei , Wu, Yi , Rong, Mingzhe , Yang, Fei , Gao, Chong et al. High-Capacity MVDC Interruption Based on IGCT Current Sharing Integrated With Freewheeling . | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2021 , 68 (11) , 10982-10991 .
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Evolution of anodic erosion components and heat transfer efficiency for W and W(80)Ag(20)in atmospheric-pressure arcs EI SCIE
期刊论文 | 2020 , 53 (47) | JOURNAL OF PHYSICS D-APPLIED PHYSICS | IF: 3.207
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Abstract :

Based on thein situdiagnostic system and the digital image post-processing technique, quantifications of the anodic erosion components and heat transfer efficiency for tungsten and the W(80)Ag(20)material in arcs of argon, helium, and nitrogen were achieved. The leading vaporization of silver has been found to result in evidently lower anodic heat transfer efficiency and much smaller molten pools compared with those of the tungsten anode, but the intensive generation of silver vapor under the melt layer causes higher splashing erosion of the W(80)Ag(20)anode. However, these characteristics can be strongly changed by the cathodic blowing, which leads to a much higher splashing erosion of tungsten anode but a lower erosion rate of W(80)Ag(20)anode. Through the visualization of the erosion behavior and the post microanalysis of the anode surface, the possible driving mechanisms for the generation of the splashing droplet were discussed. The result indicates that the local high pressure caused by the vapor blasting during the bubble explosion plays a key role in the detachment of splashing droplets. Furthermore, as for the tungsten-based anode, the comparison of erosion behavior between the W(80)Ag(20)anode and the previous-studied W(70)Cu(30)anode makes it clear that increasing the temperature difference between the melting point (MP) of tungsten and the boiling point (BP) of the other material has the pros and cons. It is effective for the decrease of the anode erosion when the anode heat energy is relatively weak, while it can promote the splashing erosion when the liquid tungsten layer has been formed on the anode tip. These results are beneficial for the optimal design of the electrode system in circuit breakers.

Keyword :

anode silver splashing droplet heat transfer erosion components tungsten temperature

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GB/T 7714 Cui, Yufei , Wu, Yi , Niu, Chunping et al. Evolution of anodic erosion components and heat transfer efficiency for W and W(80)Ag(20)in atmospheric-pressure arcs [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2020 , 53 (47) .
MLA Cui, Yufei et al. "Evolution of anodic erosion components and heat transfer efficiency for W and W(80)Ag(20)in atmospheric-pressure arcs" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 53 . 47 (2020) .
APA Cui, Yufei , Wu, Yi , Niu, Chunping , Rong, Mingzhe , Sun, Hao , Niu, Lizhuang et al. Evolution of anodic erosion components and heat transfer efficiency for W and W(80)Ag(20)in atmospheric-pressure arcs . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2020 , 53 (47) .
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A Novel Liquid Metal Fault Current Limiter Based on Active Trigger Method Scopus SCIE
期刊论文 | 2020 | IEEE Transactions on Power Delivery | IF: 4.131
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Abstract :

A novel liquid metal fault current limiter (LMFCL) is introduced to enhance the fault responding performance while increasing the rated current-carrying capacity. The proposed limiter utilizes an active trigger method to ignite the arc, achieving a much shorter pre-arcing time than the previous one, namely the self-pinch LMFCL. Firstly, the arcing phenomenon of liquid metal under a continuous current is studied, which results in a restriction of the rated current for a limiter. Then, the structure and working principle of the active triggered LMFCL are presen- ted. Experimental investigations are conducted to learn the whole arcing process. Furthermore, the current limiting performances based on the novel and conventional methods are compared, and the critical conditions of arc ignition under different parameters are studied. In addition, a continuous current-carrying test is implemented on an improved limiter. The results show that the proposed method is able to shorten the fault responding time significantly, while it allows the LMFCL to carry a considerable rated current. IEEE

Keyword :

Active trigger; arc ignition; fault current limiters (FCLs); Fault currents; Ignition; Limiting; liquid metal (LM); Liquids; Metals; self-pinch effect; Steady-state; Surface treatment

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GB/T 7714 Niu, C. , Wang, B. , He, H. et al. A Novel Liquid Metal Fault Current Limiter Based on Active Trigger Method [J]. | IEEE Transactions on Power Delivery , 2020 .
MLA Niu, C. et al. "A Novel Liquid Metal Fault Current Limiter Based on Active Trigger Method" . | IEEE Transactions on Power Delivery (2020) .
APA Niu, C. , Wang, B. , He, H. , Wu, Y. , Rong, M. , Li, J. et al. A Novel Liquid Metal Fault Current Limiter Based on Active Trigger Method . | IEEE Transactions on Power Delivery , 2020 .
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Damping HVDC Circuit Breaker With Current Commutation and Limiting Integrated EI SCIE
期刊论文 | 2020 , 67 (12) , 10433-10441 | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS | IF: 8.236
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Abstract :

The fault current limiting in high-voltage dc (HVdc) grids is critical to reducing the breaking stress of dc circuit breaker and improving the breaking reliability. However, the existing HVdc circuit breakers rarely consider the rapid limiting of fault current in the breaking process. In this article, a novel HVdc circuit breaker integrating current commutation and damping is presented, which can realize fast current limiting and interruption while preserving large breaking capability and low cost. Simulation analysis of current commutation capability is carried out to determine the optimal parameters in the current damping module. Then, the fault current breaking performance of the proposed HVdc breaker is evaluated and compared with conventional hybrid HVdc breaker theoretically. Finally, a low-power prototype of the current damping dc breaker is built and tested to verify the validity of the proposed topology.

Keyword :

Circuit breakers Damping Thyristors Capacitors Topology current limiting high-voltage dc (HVdc) circuit breaker HVDC transmission Fault currents damping Commutation capability

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GB/T 7714 Wu, Yifei , Rong, Mingzhe , Wu, Yi et al. Damping HVDC Circuit Breaker With Current Commutation and Limiting Integrated [J]. | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2020 , 67 (12) : 10433-10441 .
MLA Wu, Yifei et al. "Damping HVDC Circuit Breaker With Current Commutation and Limiting Integrated" . | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 67 . 12 (2020) : 10433-10441 .
APA Wu, Yifei , Rong, Mingzhe , Wu, Yi , Yang, Fei , Yi, Qiang . Damping HVDC Circuit Breaker With Current Commutation and Limiting Integrated . | IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2020 , 67 (12) , 10433-10441 .
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Prediction of the Electrical Strength and Boiling Temperature of the Substitutes for Greenhouse Gas SF Using Neural Network and Random Forest EI SCIE Scopus
期刊论文 | 2020 , 8 , 124204-124216 | IEEE Access | IF: 3.367
WoS CC Cited Count: 2 SCOPUS Cited Count: 1
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Abstract :

Finding substitutes for sulfur hexafluoride (SF6), a gas with extremely high global warming potential, has been a persistent effort for years in the field of high voltage power equipment, which focuses on the evaluation of the electrical strength and boiling temperature for the practical purpose. Following up the previous proposed linear regression models, this work introduces machine learning algorithms including artificial neural network (ANN) and random forest (RF) as the potential approaches to predict the electrical strength and boiling temperature. Based on a series of descriptors derived from the molecular structure of 74 molecules, the performance of three different methods: multiple linear regression, artificial neural network and random forest are compared and assessed in terms of the sensitivity to the sample size, prediction accuracy and stability, and the interpretability of predictors. Considering the available data are limited, random forest shows superior performance with higher robustness and efficiency. The same approaches were applied to the boiling temperature and random forest produced better results as well. Besides, the variable importance ranked by RF improves understanding of the correlation between the molecular properties and electrical strength. It provides important insights to analyze the properties of the SF6 substitutes during the design and synthesis of the new eco-friendly gases in power equipment. © 2013 IEEE.

Keyword :

Greenhouse gases Neural networks Machine learning Boiling point Global warming Linear regression Oil field equipment Random forests Sulfur hexafluoride Decision trees Forecasting

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GB/T 7714 Sun, Hao , Liang, Luqi , Wang, Chunlin et al. Prediction of the Electrical Strength and Boiling Temperature of the Substitutes for Greenhouse Gas SF Using Neural Network and Random Forest [J]. | IEEE Access , 2020 , 8 : 124204-124216 .
MLA Sun, Hao et al. "Prediction of the Electrical Strength and Boiling Temperature of the Substitutes for Greenhouse Gas SF Using Neural Network and Random Forest" . | IEEE Access 8 (2020) : 124204-124216 .
APA Sun, Hao , Liang, Luqi , Wang, Chunlin , Wu, Yi , Yang, Fei , Rong, Mingzhe . Prediction of the Electrical Strength and Boiling Temperature of the Substitutes for Greenhouse Gas SF Using Neural Network and Random Forest . | IEEE Access , 2020 , 8 , 124204-124216 .
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A Novel Current Injection DC Circuit Breaker Integrating Current Commutation and Energy Dissipation EI SCIE Scopus
期刊论文 | 2020 , 8 (3) , 2861-2869 | IEEE Journal of Emerging and Selected Topics in Power Electronics | IF: 4.472
WoS CC Cited Count: 2 SCOPUS Cited Count: 5
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Abstract :

Current injection DC interruption is considered one of the most promising and innovative technologies to address the need of fast fault isolation in medium-voltage DC systems due to its advantages in cost, conduction loss, and breaking capacity. In this paper, a novel current injection DC circuit breaker (DCCB) integrating the current commutation and energy dissipation is proposed. The symbiosis between the magnetic induction current commutation module (MICCM) and metal oxide varistor (MOV) eliminates the disadvantages in conventional current injection scheme, offering a cost effective solution for isolating faults while preserving large current breaking capability. With the circuit and structure parameters of MICCM optimized carefully based on the simulation analysis, a prototype of 10 kV DCCB is built, and its breaking performance is finally verified. © 2013 IEEE.

Keyword :

Electric commutation Electric circuit breakers Metals Cost effectiveness Energy dissipation Timing circuits

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GB/T 7714 Wu, Yifei , Wu, Yi , Yang, Fei et al. A Novel Current Injection DC Circuit Breaker Integrating Current Commutation and Energy Dissipation [J]. | IEEE Journal of Emerging and Selected Topics in Power Electronics , 2020 , 8 (3) : 2861-2869 .
MLA Wu, Yifei et al. "A Novel Current Injection DC Circuit Breaker Integrating Current Commutation and Energy Dissipation" . | IEEE Journal of Emerging and Selected Topics in Power Electronics 8 . 3 (2020) : 2861-2869 .
APA Wu, Yifei , Wu, Yi , Yang, Fei , Rong, Mingzhe , Hu, Yang . A Novel Current Injection DC Circuit Breaker Integrating Current Commutation and Energy Dissipation . | IEEE Journal of Emerging and Selected Topics in Power Electronics , 2020 , 8 (3) , 2861-2869 .
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Bidirectional Current Injection MVDC Circuit Breaker: Principle and Analysis EI SCIE Scopus
期刊论文 | 2020 , 8 (2) , 1536-1546 | IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS | IF: 4.472
WoS CC Cited Count: 3 SCOPUS Cited Count: 3
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Abstract :

The medium-voltage dc (MVDC) interruption technology has grown in recent years, driven by increased interest in using MVDC system for integrating distributed renewable energy and improving the efficiency of power supply. In this paper, two topologies of current injection MVDC breaker are focused on. The first topology is based on conventional precharged capacitor that utilizes a bridge-type commutation branch to realize the freewheeling for the interrupter and bidirectional breaking. With the help of simulation, the effect of stray inductances on the current commutation capability is analyzed in detail, and then, a prototype of the MVDC breaker is built to test the fault current breaking performance. The second topology is an improved MVDC breaker based on magnetic induction current commutation module (MICCM). With MICCM analyzed carefully in terms of circuit and structure parameters for determining their optimal values, the prototype of the improved 10-kV dc breaker is built and tested, which validates the feasibility and effectiveness of improved topology.

Keyword :

Inductance Capacitors medium-voltage dc (MVDC) breaker Power electronics Switches current injection Topology Fault currents Bridge-type commutation branch magnetic induction Prototypes

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GB/T 7714 Wu, Yifei , Wu, Yi , Yang, Fei et al. Bidirectional Current Injection MVDC Circuit Breaker: Principle and Analysis [J]. | IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS , 2020 , 8 (2) : 1536-1546 .
MLA Wu, Yifei et al. "Bidirectional Current Injection MVDC Circuit Breaker: Principle and Analysis" . | IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS 8 . 2 (2020) : 1536-1546 .
APA Wu, Yifei , Wu, Yi , Yang, Fei , Rong, Mingzhe , Hu, Yang . Bidirectional Current Injection MVDC Circuit Breaker: Principle and Analysis . | IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS , 2020 , 8 (2) , 1536-1546 .
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Comprehensive modeling for geometric optimization of a thermoelectric generator module EI SCIE Scopus
期刊论文 | 2019 , 183 , 645-659 | ENERGY CONVERSION AND MANAGEMENT
WoS CC Cited Count: 7 SCOPUS Cited Count: 11
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Abstract :

This paper develops a one-dimensional simulation model of a thermoelectric module aiming at its characteristic exploration and output performance prediction. Almost all related effects are considered including Seebeck, Peltier, Thomson effects, the spatial- and temperature-dependent thermoelectric material properties, as well as the other irreversible factors. In order to ensure its high accuracy and computational efficiency, the differential equations built for components of non-linear physical properties, and analytical equations for the others of constant properties are jointly solved by numerical methods and implemented in MATLAB integrated development environment. A small deviation of 1.44% exists between its calculated output power and that by a previously reported three-dimensional model under a specific wide load range (0-250 Omega), validating its accuracy of this model. Besides, it indicates that both the proportions of heat leakage through the occupied air zone and its maximum output power to the input total heat flow have the same order of magnitude. A rising proportion for the former has to be paid attention in case of a higher temperature difference applied. The assumption of regarding its electrical contact resistance as an identical external resistance connected with the load in series is computationally proved to generate a negligible discrepancy in terms of TEM characteristics and its output performance. Furthermore, with respect to the impacts of TEM geometry, the pre-set fixed substrate area weakens the equivalence of regarding a thermoelectric module with larger cross-section area of thermoelectric legs as multiple identical modules with smaller leg areas connected in parallel. It accounts for the better linearity of rising output power by a long leg than that by a short leg as the leg area increases. A long thermoelectric leg means an increased induced electrical potential and inner resistance as well, thus leading to a single peak of the output power as the leg length increases. Finally, a thermoelectric geometric optimization approach abased on the Hill-climbing algorithm is introduced and first applied for the maximum output. Its accuracy and efficiency are validated and analyzed detailedly by supplying different variables as initial search point. All the methods and conclusions in this paper can assist thermoelectric generators' performance estimation and guide the geometric optimizations regarding their large-scale applications in the future.

Keyword :

Thermoelectric generator modeling The Hill-climbing algorithm Thermoelectric performance Geometric optimization method

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GB/T 7714 He, Hailong , Wu, Yi , Liu, Weiwei et al. Comprehensive modeling for geometric optimization of a thermoelectric generator module [J]. | ENERGY CONVERSION AND MANAGEMENT , 2019 , 183 : 645-659 .
MLA He, Hailong et al. "Comprehensive modeling for geometric optimization of a thermoelectric generator module" . | ENERGY CONVERSION AND MANAGEMENT 183 (2019) : 645-659 .
APA He, Hailong , Wu, Yi , Liu, Weiwei , Rong, Mingzhe , Fang, Zhenxuan , Tang, Xiaojun . Comprehensive modeling for geometric optimization of a thermoelectric generator module . | ENERGY CONVERSION AND MANAGEMENT , 2019 , 183 , 645-659 .
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