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< Page ,Total 46 >
Effects of Spike Voltages Coupling With High dV/dt Square Wave on Dielectric Loss and Electric-Thermal Field of High-Frequency Transformer EI SCIE
期刊论文 | 2021 , 9 , 137733-137743 | IEEE ACCESS
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Abstract :

The insulation of high-frequency transformers (HFTs) has a significant impact on the safety and reliability of high voltage power electronic transformers (PETs). The transient voltages from the rapid turn-off and turn-on of the high voltage power semiconducting device increase the insulation stress and loss, resulting in thermal stress distortion. However, few studies have presented an accurate evaluation of the dielectric loss, especially under high dV/dt square waves. This paper focuses on the dielectric loss calculation in HFT insulation by analyzing the loss from a high-frequency square wave with spike voltages. A step function that is equivalent to spike voltage superposition is proposed for the quantitative calculation of the dielectric loss of epoxy resin. A cutoff frequency (f(c)) is defined to indicate high dV/dt characteristics. A similar narrow step function is used for simulating spike voltage at the rising/falling edge. The additional dielectric loss increases with the spike voltage and the duration. The electric field and temperature distributions are simulated in a 10 kW, 10 kHz HFT by considering the calculation of dielectric loss. The spike voltages enhance the electric field and temperature in the insulation. The increase in the external temperature (close to the glass transition temperature ((T-g) of epoxy resin) causes a significant increase in the insulation temperature. This paper is of great importance to the design and application of HFT insulation.

Keyword :

cutoff frequency Dielectric losses Temperature measurement square wave Stress Dielectrics spike voltage FEM dielectric loss Insulation High-frequency transformer Power harmonic filters Harmonic analysis

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GB/T 7714 Wang, Weiwang , He, Jiefeng , Liu, Ying et al. Effects of Spike Voltages Coupling With High dV/dt Square Wave on Dielectric Loss and Electric-Thermal Field of High-Frequency Transformer [J]. | IEEE ACCESS , 2021 , 9 : 137733-137743 .
MLA Wang, Weiwang et al. "Effects of Spike Voltages Coupling With High dV/dt Square Wave on Dielectric Loss and Electric-Thermal Field of High-Frequency Transformer" . | IEEE ACCESS 9 (2021) : 137733-137743 .
APA Wang, Weiwang , He, Jiefeng , Liu, Ying , Wang, Xin , Li, Shengtao . Effects of Spike Voltages Coupling With High dV/dt Square Wave on Dielectric Loss and Electric-Thermal Field of High-Frequency Transformer . | IEEE ACCESS , 2021 , 9 , 137733-137743 .
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Enhanced DC breakdown strength of epoxy nanocomposites at elevated temperature and its mechanisms EI SCIE
期刊论文 | 2021 , 130 (6) | JOURNAL OF APPLIED PHYSICS
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Abstract :

Breakdown of epoxy composites is easy to be triggered as the temperature is elevated. In order to improve the DC breakdown strength of epoxy composites at elevated temperature and explore the DC breakdown mechanism, functional nano-titania (TiO2) particles were incorporated into the epoxy matrix with different filler loadings, molecular chain dynamic characteristics were analyzed by dielectric relaxation spectrum analysis, free volumes of epoxy nanocomposites were evaluated by thermal expansion dilatometer, and DC breakdown strengths of samples were tested at 413 K. Results indicate that DC breakdown strength first increases and then decreases with nanoparticle filler loadings, and a 10.89% improvement of DC breakdown strength is found compared to pristine epoxy resin. The breakdown strength of epoxy resin at elevated temperature is determined by the expansion properties of free volume in the interfacial region between the epoxy matrix and nanoparticles. When incorporating a small amount of nanoparticles, free volume is difficult to expand due to the strong interactions between molecular chains and nanoparticles, the fraction of free volume decreases, and long molecular chains of epoxy are hard to move, and thus DC breakdown strength increases. While further adding nanoparticles, interfacial regions of nanoparticles overlap and free volumes are likely to expand by thermal stimulation in the overlap region, which accelerate molecular chain dynamics and improve free volume fraction, and DC breakdown strength increases. It can be found that DC breakdown strength at an elevated temperature can be enhanced by tailoring free volume through incorporating proper content of functional nanoparticles. Published under an exclusive license by AIP Publishing.

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GB/T 7714 Li, Zhen , Min, Daomin , Niu, Huan et al. Enhanced DC breakdown strength of epoxy nanocomposites at elevated temperature and its mechanisms [J]. | JOURNAL OF APPLIED PHYSICS , 2021 , 130 (6) .
MLA Li, Zhen et al. "Enhanced DC breakdown strength of epoxy nanocomposites at elevated temperature and its mechanisms" . | JOURNAL OF APPLIED PHYSICS 130 . 6 (2021) .
APA Li, Zhen , Min, Daomin , Niu, Huan , Li, Shijun , Zhang, Yuanyuan , Huang, Yin et al. Enhanced DC breakdown strength of epoxy nanocomposites at elevated temperature and its mechanisms . | JOURNAL OF APPLIED PHYSICS , 2021 , 130 (6) .
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Effect of Al(OH)3 and thermal ageing on the dielectric performance of composite insulator shed based on THz-TDS EI
会议论文 | 2021 | 4th IEEE China International Electrical and Energy Conference, CIEEC 2021
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Abstract :

Composite insulator shed is easy to be affected by temperature, ultraviolet radiation, and other factors, resulting in the declining of insulation performance and threatening the safe operation. This paper aims at studying the terahertz frequency domain characteristics of high temperature vulcanized (HTV) silicone rubber (SIR) by terahertz time-domain spectroscopy (THz-TDS). Besides, the effects of high temperature on HTV SIR and the ageing mechanism in terahertz frequency domain are explored. The results show that ATH (Al(OH)3) in HTV SIR has obvious characteristic peaks at 1.2THz and 1.33THz, which can also increase the refractive index and dielectric constant of HTV SIR. Moreover, thermal ageing increases the refractive index and dielectric constant of HTV SIR in terahertz frequency domain with ageing time. The results of Fourier transform infrared spectroscopy (FTIR) show that the intensity of -OH increases but the intensity of C-H, -CH3 and Si-O-Si decrease with ageing time, which helps explain the results of THz-TDS. This study shows that THz-TDS is of great significance to the detection of polymers. © 2021 IEEE.

Keyword :

Terahertz spectroscopy Frequency domain analysis Silicone rubber Silicones Fourier transform infrared spectroscopy Laser pulses Terahertz waves Rubber Insulating materials Time domain analysis Refractive index Silicon Thermal aging Electric insulators Aluminum hydroxide

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GB/T 7714 Wang, Mengqi , Liu, Hao , Li, Jiacai et al. Effect of Al(OH)3 and thermal ageing on the dielectric performance of composite insulator shed based on THz-TDS [C] . 2021 .
MLA Wang, Mengqi et al. "Effect of Al(OH)3 and thermal ageing on the dielectric performance of composite insulator shed based on THz-TDS" . (2021) .
APA Wang, Mengqi , Liu, Hao , Li, Jiacai , Li, Shengtao , Lian, Ze , Shen, Wei . Effect of Al(OH)3 and thermal ageing on the dielectric performance of composite insulator shed based on THz-TDS . (2021) .
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Study on Insulation Performance of Thermal Aging XLPE Cables by Direct Current Integrated Charge Technique EI
会议论文 | 2021 | 3rd International Conference on Electrical Materials and Power Equipment, ICEMPE 2021
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Abstract :

The effect of thermal aging on the insulation performance of XLPE cables is studied using a new diagnosis technique-direct current integrated charge (DCIC-Q(t)). The influence process of thermal aging on crosslinked polyethylene (XLPE) and the measuring principle of DCIC-Q(t) were described. Several thermal aged XLPE cables were obtained for DCIC-Q(t) experiments. The dynamic charge curve of cables under different thermal aging conditions is obtained, and charge ratio R is proposed to compare the charge injection and accumulation. The permittivity r and conductivity γ of XLPE insulation are calculated to analyze the aging level of XLPE cable insulation. It can be concluded that this technique can be useful to monitor the aging of the full-sized cable and has potential to applying in other insulation system. © 2021 IEEE.

Keyword :

Cable sheathing Thermal aging Thermal insulation Electric circuit breakers

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GB/T 7714 Huang, Bingrong , Wang, Weiwang , Li, Shengtao et al. Study on Insulation Performance of Thermal Aging XLPE Cables by Direct Current Integrated Charge Technique [C] . 2021 .
MLA Huang, Bingrong et al. "Study on Insulation Performance of Thermal Aging XLPE Cables by Direct Current Integrated Charge Technique" . (2021) .
APA Huang, Bingrong , Wang, Weiwang , Li, Shengtao , Li, Xinyuan , Nie, Yongjie , Deng, Yunkun et al. Study on Insulation Performance of Thermal Aging XLPE Cables by Direct Current Integrated Charge Technique . (2021) .
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Mould-Free Skin-Inspired Robust and Sensitive Flexible Pressure Sensors With Hierarchical Microstructures EI SCIE
期刊论文 | 2021 , 42 (10) , 1536-1539 | IEEE ELECTRON DEVICE LETTERS
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Abstract :

Flexible microscopic pressure sensors are important to the emerging fields of intelligent robots and advanced healthcare. However, common microstructured pressure sensors often require sophisticated mould and/or material preparation, and yield limited pressure sensing performances. In this letter, we report a facile approach to design a scalable and stretchable mould-free sensitive layer with a unique hierarchical microstructure. Inspired by natural skin, a sensitive layer with interdigitated electrodes is utilized to constructed into resistive pressure sensors, which are able to robustly detect the pressure variations with high sensitivity in a wide dynamic range (about 33 kPa(-1) below 5 kPa, more than 0.6 kPa(-1) under 108 kPa), also deliver low hysteresis (within 8%), rapid response (less than 48 ms), and ultralow operation voltage (10 mu V). We illustrate that such self-patterned high-performance pressure sensors can be applied to convert the pressure stimulus into spike-like signals in both low-and medium-pressure regimes, and are being able to clearly reveal the details of human pulse wave.

Keyword :

electronic-skin hierarchical microstructures mould-free Pressure sensors

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GB/T 7714 Ma, Chao , Xu, Dong , Liu, Wenfeng et al. Mould-Free Skin-Inspired Robust and Sensitive Flexible Pressure Sensors With Hierarchical Microstructures [J]. | IEEE ELECTRON DEVICE LETTERS , 2021 , 42 (10) : 1536-1539 .
MLA Ma, Chao et al. "Mould-Free Skin-Inspired Robust and Sensitive Flexible Pressure Sensors With Hierarchical Microstructures" . | IEEE ELECTRON DEVICE LETTERS 42 . 10 (2021) : 1536-1539 .
APA Ma, Chao , Xu, Dong , Liu, Wenfeng , Dong, Tianyu , Li, Sheng-Tao . Mould-Free Skin-Inspired Robust and Sensitive Flexible Pressure Sensors With Hierarchical Microstructures . | IEEE ELECTRON DEVICE LETTERS , 2021 , 42 (10) , 1536-1539 .
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Analytical Model of Micropyramidal Capacitive Pressure Sensors and Machine-Learning-Assisted Design SCIE
期刊论文 | 2021 , 6 (12) | ADVANCED MATERIALS TECHNOLOGIES
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Abstract :

Flexible micro-pyramidal capacitive pressure sensors provide a high-level tunability, showing fascinating implications in various applications, such as advanced healthcare, protheses, and smart robots. In this work, analytical models for capacitive pressure sensors are reported based on micro-pyramidal electrodes and dielectrics, which are confirmed by both finite element simulations and existing experimental results. The proposed models can be used to predict the pressure response in a wide dynamic range, which enables to efficiently analyze the pressure range, linearity, and multiple regimes of sensitivity for designing devices. Moreover, neural networks are introduced to approximate the pressure responses, and, in turn, to inversely design the parameters of the pressure sensors with a desired pressure response. The machine-learning-assisted design is able to find multiple designed parameters for the customization purpose, manifesting itself a powerful approach to customize the sensor performance.

Keyword :

flexible capacitive pressure sensor neural networks machine learning micropyramids inverse design

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GB/T 7714 Ma, Chao , Li, Gang , Qin, Longhui et al. Analytical Model of Micropyramidal Capacitive Pressure Sensors and Machine-Learning-Assisted Design [J]. | ADVANCED MATERIALS TECHNOLOGIES , 2021 , 6 (12) .
MLA Ma, Chao et al. "Analytical Model of Micropyramidal Capacitive Pressure Sensors and Machine-Learning-Assisted Design" . | ADVANCED MATERIALS TECHNOLOGIES 6 . 12 (2021) .
APA Ma, Chao , Li, Gang , Qin, Longhui , Huang, Weicheng , Zhang, Hongrui , Liu, Wenfeng et al. Analytical Model of Micropyramidal Capacitive Pressure Sensors and Machine-Learning-Assisted Design . | ADVANCED MATERIALS TECHNOLOGIES , 2021 , 6 (12) .
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Coupling Effect of Electron Irradiation and Operating Voltage on the Deep Dielectric Charging Characteristics of Solar Array Drive Assembly EI SCIE
期刊论文 | 2021 , 68 (7) , 1399-1406 | IEEE TRANSACTIONS ON NUCLEAR SCIENCE
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Abstract :

A deep dielectric charging model of a solar array drive assembly (SADA) under the coupling effect of electron irradiation and operating voltage is established based on the bipolar charge transport process. The distribution of space charge, potential and electric field in SADA are simulated and analyzed under three different operating conditions, i.e., flux model for internal charging (FLUMIC) spectrum electron irradiation acting alone; operating voltage acting alone; electron irradiation and operating voltage coupled. The effects of electron flux enhancement, electron direction, and operating voltage on charging properties are studied. Based on these investigations, discharge risk and location are pointed out. In the case of electrons incident from the end surface acting alone, much more space charge will accumulate than that from the columnar surface, and the maximum electric field will be above 10(8) V/m when the flux enhancement exceeds 100. When the operating voltage acts alone, the maximum electric field will not exceed 10(7) V/m as long as the operating voltage is below 8772 V. Under typical spectrum, the maximum electric field under coupling effect increases linearly as the operating voltage increases. When the electron flux enhancement increases to 100 and 1000, the electron irradiation dominates the deep charging characteristic. This provides theoretical guidance for the methods of discharge containment in SADAs.

Keyword :

operating voltage Electric fields Couplings Integrated circuit modeling solar array drive assembly (SADA) Dielectrics deep dielectric charging Surface charging Space vehicles Coupling effect Radiation effects flux model for internal charging (FLUMIC) electron spectrum

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GB/T 7714 Wang, Xiaoping , Min, Daomin , Pan, Shaoming et al. Coupling Effect of Electron Irradiation and Operating Voltage on the Deep Dielectric Charging Characteristics of Solar Array Drive Assembly [J]. | IEEE TRANSACTIONS ON NUCLEAR SCIENCE , 2021 , 68 (7) : 1399-1406 .
MLA Wang, Xiaoping et al. "Coupling Effect of Electron Irradiation and Operating Voltage on the Deep Dielectric Charging Characteristics of Solar Array Drive Assembly" . | IEEE TRANSACTIONS ON NUCLEAR SCIENCE 68 . 7 (2021) : 1399-1406 .
APA Wang, Xiaoping , Min, Daomin , Pan, Shaoming , Zheng, Shusai , Hou, Xinbin , Wang, Li et al. Coupling Effect of Electron Irradiation and Operating Voltage on the Deep Dielectric Charging Characteristics of Solar Array Drive Assembly . | IEEE TRANSACTIONS ON NUCLEAR SCIENCE , 2021 , 68 (7) , 1399-1406 .
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Thermal and dielectric properties of epoxy resin filled with double-layer surface-modified boron nitride nanosheets EI SCIE
期刊论文 | 2021 , 274 | MATERIALS CHEMISTRY AND PHYSICS
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Abstract :

Owing to the rapid development of advanced power system and modern micro-electronic devices, exploiting composites with excellent thermal conductivity and dielectric properties has become increasingly important. In this work, a double-layer surface modification method of grafting dopamine (DA) at the end of 3-glycidoxypropyl-trimethoxysilane (KH560) is firstly proposed to modify the surface of boron nitride nanosheet (BNNS), for improving the thermal conductivity and dielectric properties of epoxy resin (EP). Besides, the thermal conductivity of EP composites with double-layer surface-modified BNNSs and its improvement mechanism is explored with molecular dynamics (MD) simulation from micro level. The results illustrate that thermal conductivity of EP composites doped with double-layer modified BNNSs by grafting DA at the end of KH560 (DKBP) is 0.252 W/(m.K), 129% higher than EP. Moreover, this double-layer surface modification method of DKBP is beneficial to enhance the heat transfer effect and reduce scattering effect at the interface, which is the essential reasons for improving thermal conductivity of composites. Meanwhile, DKBP composite also presents superior dielectric properties. This work provides a promising idea to develop new insulating materials with high thermal conductivity.

Keyword :

Interface Thermal conductivity Epoxy resin Boron nitride nanosheet Double-layer surface modification

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GB/T 7714 Li, Jiacai , Li, Shengtao . Thermal and dielectric properties of epoxy resin filled with double-layer surface-modified boron nitride nanosheets [J]. | MATERIALS CHEMISTRY AND PHYSICS , 2021 , 274 .
MLA Li, Jiacai et al. "Thermal and dielectric properties of epoxy resin filled with double-layer surface-modified boron nitride nanosheets" . | MATERIALS CHEMISTRY AND PHYSICS 274 (2021) .
APA Li, Jiacai , Li, Shengtao . Thermal and dielectric properties of epoxy resin filled with double-layer surface-modified boron nitride nanosheets . | MATERIALS CHEMISTRY AND PHYSICS , 2021 , 274 .
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Electrochromism of Viologen/Polymer Composite: From Gel to Insulating Bulk for High-Voltage Applications SCIE PubMed
期刊论文 | 2021 , 14 (19) | MATERIALS
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Abstract :

Power equipment operates under high voltages, inducing space charge accumulation on the surface of key insulating structures, which increases the risk of discharge/breakdown and the possibility of maintenance workers experiencing electric shock accidents. Hence, a visualized non-equipment space charge detection method is of great demand in the power industry. Typical electrochromic phenomenon is based on redox of the material, triggered by a voltage smaller than 5 V with a continuous current in mu A~mA level, which is not applicable to high electric fields above 10(6) V/m with pA~nA operation current in power equipment. Until now, no naked-eye observation technique has been realized for space charge detection to ensure the operation of power systems as well as the safety of maintenance workers. In this work, a viologen/poly(vinylidene fluoride-co-hexafluoropropylene)(P(VDF-HFP)) composite is investigated from gel to insulating bulk configurations to achieve high-voltage electrical-insulating electrochromism. The results show that viologen/P(VDF-HFP) composite bulk can withstand high electric fields at the 10(7) V/m level, and its electrochromism is triggered by space charges. This electrochromism phenomenon can be visually extended by increasing viologen content towards 5 wt.% and shows a positive response to voltage amplitude and application duration. As viologen/P(VDF-HFP) composite bulk exhibits a typical electrical insulating performance, it could be attached to the surface of insulating structures or clamped between metal and insulating materials as a space charge accumulation indicator in high-voltage power equipment.

Keyword :

electrochromism high voltage space charge insulation polymer

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GB/T 7714 Nie, Yongjie , Zhang, Meng , Zhu, Yuanwei et al. Electrochromism of Viologen/Polymer Composite: From Gel to Insulating Bulk for High-Voltage Applications [J]. | MATERIALS , 2021 , 14 (19) .
MLA Nie, Yongjie et al. "Electrochromism of Viologen/Polymer Composite: From Gel to Insulating Bulk for High-Voltage Applications" . | MATERIALS 14 . 19 (2021) .
APA Nie, Yongjie , Zhang, Meng , Zhu, Yuanwei , Jing, Yu , Shi, Wenli , Li, Guoping et al. Electrochromism of Viologen/Polymer Composite: From Gel to Insulating Bulk for High-Voltage Applications . | MATERIALS , 2021 , 14 (19) .
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The mechanism of gas pressure and temperature dependent surface flashover in compressed gas involving gas adsorption EI SCIE
期刊论文 | 2021 , 539 | Applied Surface Science
WoS CC Cited Count: 1
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Abstract :

In surface science, when a high voltage is applied, a penetrating discharge occurs along the gas-solid interface, which is called surface flashover. Although the electron stimulated gas desorption is a crucial process for surface flashover in vacuum, the underlying gas-solid interaction physics process for surface flashover is still ambiguous in compressed gas. In this study, the effect of gas adsorption on surface flashover is taken into consideration, surface flashover voltage, gas breakdown voltage, gas adsorption quantity are tested at various gas pressures and temperatures in N2, and the surface gas density is calculated. It is found that the difference between surface flashover voltage and gas breakdown voltage (Vf/Vb) has a positive correlation with the relative gas adsorption ability (Va×T/p or Nsur/Nav) in a wide gas pressure, temperature and density ranges. The results indicate surface flashover occurs in the gas adsorption layer, which density is higher than the average gas density in the gas phase. The gas adsorption improves the surface flashover voltage by impeding electrons collision ionization process in compressed gas. The findings in this research provide a new perspective for studying surface flashover, and offer a route to improve surface flashover performances by tailoring surface adsorption characteristics. © 2020 Elsevier B.V.

Keyword :

Electric breakdown of gases Ionization of gases Partial discharges Gases Density of gases Flashover Phase interfaces Gas adsorption

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GB/T 7714 Li, Zhen , Li, Shengtao , Xu, Haoming et al. The mechanism of gas pressure and temperature dependent surface flashover in compressed gas involving gas adsorption [J]. | Applied Surface Science , 2021 , 539 .
MLA Li, Zhen et al. "The mechanism of gas pressure and temperature dependent surface flashover in compressed gas involving gas adsorption" . | Applied Surface Science 539 (2021) .
APA Li, Zhen , Li, Shengtao , Xu, Haoming , Qu, Guanghao , Niu, Huan , Huang, Yin et al. The mechanism of gas pressure and temperature dependent surface flashover in compressed gas involving gas adsorption . | Applied Surface Science , 2021 , 539 .
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