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Hu YH, Sun SR, Meng X, Huang HJ, Wang HX. Experimental study on the full cycle evolution of high-intensity atmospheric dc arc discharge from breakdown to extinguishment. Phys Rev E 2024; 109:025205. [PMID: 38491683 DOI: 10.1103/physreve.109.025205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 01/04/2024] [Indexed: 03/18/2024]
Abstract
In this study, the spatiotemporal evolution of full cycle of high-intensity dc argon arc discharge at atmospheric pressure is investigated by using a transferred arc device, which is easy to be directly observed in the experiment. Combining the voltage and current waveforms with high-speed images, the full cycle evolution process of high-intensity atmospheric dc arc can be divided into five different stages: breakdown pulse stage, cathode heating stage, current climbing stage, stable arc discharge stage, and finally arc extinguishing stage. The characteristics of each different stage are analyzed in detail through the electrical properties, high-speed pictures, and spectroscopic measurements. The results show that the strong luminescence region develops from the vicinity of cathode and anode to the middle in the breakdown pulse stage, which is explained from the spatiotemporal evolution of distributions of excited argon atom and ions. The development velocity of emission intensity of argon ions is mainly determined by the dominant stepwise ionization process. Then the cathode heating stage appears with many bright and nonuniformly distributed light spots on the cathode surface, and the electron emission mechanism of cathode gradually changes to the thermionic emission as the surface temperature rises. With the increase of arc current, the discharge channel significantly expands, then becomes stable due to the increment of the Lorentz force. The characteristics of arc extinguishing stage are clarified in terms of the decay of charged particles density.
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Affiliation(s)
- Ya-Hao Hu
- School of Astronautics, Beihang University, Beijing 100191, Beijing, China
- Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, Beijing, China
| | - Su-Rong Sun
- School of Astronautics, Beihang University, Beijing 100191, Beijing, China
| | - Xian Meng
- Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, Beijing, China
| | - He-Ji Huang
- Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, Beijing, China
| | - Hai-Xing Wang
- School of Astronautics, Beihang University, Beijing 100191, Beijing, China
- Ningbo Institute of Technology, Beihang University, Ningbo 315800, Ningbo, China
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Choi KY, Sultan MT, Ajiteru O, Hong H, Lee YJ, Lee JS, Lee H, Lee OJ, Kim SH, Lee JS, Park SJ, Eden JG, Park CH. Treatment of Fungal-Infected Diabetic Wounds with Low Temperature Plasma. Biomedicines 2021; 10:27. [PMID: 35052706 PMCID: PMC8773309 DOI: 10.3390/biomedicines10010027] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 12/07/2021] [Accepted: 12/20/2021] [Indexed: 11/16/2022] Open
Abstract
Diabetes mellitus renders patients susceptible to chronic wounds and various infections. Regarding the latter, fungal infections are of particular concern since, although they are the source of significant morbidity and mortality in immunocompromised patients, they are generally resistant to conventional treatment and a definite treatment strategy has not yet been established. Herein, we report the treatment of skin wounds in a diabetic rat model, infected by Candida albicans, with low temperature helium plasma generated in a hand-held atmospheric jet device. A fungal infection was induced on two dorsal skin wounds of the diabetic rats, and one wound was treated with the plasma jet whereas the other served as a control. Histological analysis revealed accelerated skin wound healing and decreased evidence of fungal infection in the plasma-treated group, as compared to the control group. Regeneration of the epidermis and dermis, collagen deposition, and neovascularization were all observed as a result of plasma treatment, but without wound contraction, scar formation or any evidence of thermal damage to the tissue. These findings demonstrate that the He plasma jet is remarkably effective in diabetic skin wounds infected by Candida albicans, thereby providing a promising medical treatment option for diabetes mellitus patients with skin wound and fungal infections.
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Affiliation(s)
- Kyu Young Choi
- Department of Otorhinolaryngology-Head and Neck Surgery, Hallym University Kangnam Sacred Heart Hospital, Seoul 07441, Korea;
| | - Md. Tipu Sultan
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, 1 Hallymdaehak-gil, Chuncheon 24252, Korea; (M.T.S.); (O.A.); (H.H.); (Y.J.L.); (J.S.L.); (H.L.); (O.J.L.); (S.H.K.)
| | - Olatunji Ajiteru
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, 1 Hallymdaehak-gil, Chuncheon 24252, Korea; (M.T.S.); (O.A.); (H.H.); (Y.J.L.); (J.S.L.); (H.L.); (O.J.L.); (S.H.K.)
| | - Heesun Hong
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, 1 Hallymdaehak-gil, Chuncheon 24252, Korea; (M.T.S.); (O.A.); (H.H.); (Y.J.L.); (J.S.L.); (H.L.); (O.J.L.); (S.H.K.)
| | - Young Jin Lee
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, 1 Hallymdaehak-gil, Chuncheon 24252, Korea; (M.T.S.); (O.A.); (H.H.); (Y.J.L.); (J.S.L.); (H.L.); (O.J.L.); (S.H.K.)
| | - Ji Seung Lee
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, 1 Hallymdaehak-gil, Chuncheon 24252, Korea; (M.T.S.); (O.A.); (H.H.); (Y.J.L.); (J.S.L.); (H.L.); (O.J.L.); (S.H.K.)
| | - Hanna Lee
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, 1 Hallymdaehak-gil, Chuncheon 24252, Korea; (M.T.S.); (O.A.); (H.H.); (Y.J.L.); (J.S.L.); (H.L.); (O.J.L.); (S.H.K.)
| | - Ok Joo Lee
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, 1 Hallymdaehak-gil, Chuncheon 24252, Korea; (M.T.S.); (O.A.); (H.H.); (Y.J.L.); (J.S.L.); (H.L.); (O.J.L.); (S.H.K.)
| | - Soon Hee Kim
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, 1 Hallymdaehak-gil, Chuncheon 24252, Korea; (M.T.S.); (O.A.); (H.H.); (Y.J.L.); (J.S.L.); (H.L.); (O.J.L.); (S.H.K.)
| | - Joong Seob Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Hallym University Sacred Heart Hospital, Anyang 14068, Korea;
| | - Sung-Jin Park
- Laboratory for Optical Physics and Engineering, Department of Electrical and Computer Engineering, University of Illinois, Urbana, IL 61801, USA; (S.-J.P.); (J.G.E.)
| | - James Gary Eden
- Laboratory for Optical Physics and Engineering, Department of Electrical and Computer Engineering, University of Illinois, Urbana, IL 61801, USA; (S.-J.P.); (J.G.E.)
| | - Chan Hum Park
- Nano-Bio Regenerative Medical Institute, College of Medicine, Hallym University, 1 Hallymdaehak-gil, Chuncheon 24252, Korea; (M.T.S.); (O.A.); (H.H.); (Y.J.L.); (J.S.L.); (H.L.); (O.J.L.); (S.H.K.)
- Department of Otorhinolaryngology-Head and Neck Surgery, Hallym University Chuncheon Sacred Heart Hospital, Chuncheon 24253, Korea
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