Applied Science and Convergence Technology最新文献_第10页

Experimental Study of Discharge with Flexible Electrodes at Intermediate Pressure for Radar Cross Section Reduction 柔性电极中压放电降低雷达截面积的实验研究

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Applied Science and Convergence Technology Pub Date : 2021-09-30 DOI: 10.5757/asct.2021.30.5.141

Jangjae Lee, C. Cho, M. Choi, Chang Seok Cho, T. J. Oh, Yong Shik Lee, J. Yim, Heung Cheol Yoo, Hee Soo Jung, S. You

{"title":"Experimental Study of Discharge with Flexible Electrodes at Intermediate Pressure for Radar Cross Section Reduction","authors":"Jangjae Lee, C. Cho, M. Choi, Chang Seok Cho, T. J. Oh, Yong Shik Lee, J. Yim, Heung Cheol Yoo, Hee Soo Jung, S. You","doi":"10.5757/asct.2021.30.5.141","DOIUrl":"https://doi.org/10.5757/asct.2021.30.5.141","url":null,"abstract":"In this experimental research, the characteristics of the discharge generated using a flexible electrode at intermediate pressure were investigated. We confirmed the discharge patterns according to the pulse width and frequency of a pulse generator with a fixed voltage under a pressure of 0.3 atm, which is the pressure at a typical flight altitude. Uniform discharge was found to occur at a frequency of 10 kHz with a pulse width of 4 μs and at a frequency of 20 kHz with a pulse width of 3 μs. To analyze the trend of discharge patterns, the voltage and current waveforms of the discharge in each condition were measured. In addition, the power dissipated by one cycle was calculated from the measured voltage and current waveforms. From the measurement and calculation results, it was confirmed that the dissipated power was large when the discharge occurred at a frequency of 20 kHz with a pulse width of 3 μs, that is, the brighter and more uniform discharge pattern, which was found to be the optimal discharge condition for the flexible electrode at a pressure of 0.3 atm.","PeriodicalId":8223,"journal":{"name":"Applied Science and Convergence Technology","volume":"422 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78168385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characteristics of SiO2 Etching by Capacitively Coupled Plasma with Different Fluorocarbon Liquids (C7F14, C7F8) and Fluorocarbon Gas (C4F8) 不同碳氟化合物液体(C7F14、C7F8)和碳氟化合物气体(C4F8)电容耦合等离子体刻蚀SiO2的特性

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Applied Science and Convergence Technology Pub Date : 2021-07-30 DOI: 10.5757/asct.2021.30.4.102

Seung-Wan Yoo, C. Cho, Kyung Tae Kim, Hyo-Chang Lee, Shinjae You

引用次数: 2

Fast Synthesis of Ligand-Coordinated Chromium (II) Acetate with Quadruple Bonds by Seed-Mediated Growth 种子介导快速合成四键配位乙酸铬

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Applied Science and Convergence Technology Pub Date : 2021-07-30 DOI: 10.5757/asct.2021.30.4.95

Intek Song

引用次数: 0

Influence of Bismuth Oxide on Dielectric Properties of Barium Titanate Solid Solution 氧化铋对钛酸钡固溶体介电性能的影响

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Applied Science and Convergence Technology Pub Date : 2021-07-30 DOI: 10.5757/asct.2021.30.4.98

Y. Kim

引用次数: 0

Graphene Field-Effect Transistor Based High-Performance Wireless Portable Device for H1N1 Detection 基于石墨烯场效应晶体管的H1N1检测高性能无线便携设备

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Applied Science and Convergence Technology Pub Date : 2021-07-30 DOI: 10.5757/asct.2021.30.4.111

Kyung Ho Kim, Jaieun An, Jun-Seob Kim, Joonwon Bae, Oh Seok Kwon

引用次数: 2

Distinctive Spectroscopic Characteristics Observed in Colloidal Perovskite CsPbBr3 Quantum Dot 胶体钙钛矿CsPbBr3量子点独特光谱特性的观察

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Applied Science and Convergence Technology Pub Date : 2021-07-30 DOI: 10.5757/asct.2021.30.4.107

Sangeun Cho, S. Noh, Hyungsang Kim, H. Im

引用次数: 1

Enhancement of Photocatalytic Activity of Tris (bipyridine) Ruthenium by Encapsulation in Zeolitic Imidazolate Framework-11 and 12 咪唑酸分子筛包封增强三(联吡啶)钌光催化活性-11和12

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Applied Science and Convergence Technology Pub Date : 2021-07-30 DOI: 10.5757/asct.2021.30.4.115

Hyun Sung Kim

引用次数: 1

A Study on Beam Extraction Characteristics of RF and DC Filament Ion Source for High Current Ion Implanters 用于大电流离子注入的射频和直流灯丝离子源光束提取特性研究

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Applied Science and Convergence Technology Pub Date : 2021-05-31 DOI: 10.5757/ASCT.2021.30.3.92

Ju-Hong Cha, Sang‐Woo Kim, Ho‐Jun Lee

{"title":"A Study on Beam Extraction Characteristics of RF and DC Filament Ion Source for High Current Ion Implanters","authors":"Ju-Hong Cha, Sang‐Woo Kim, Ho‐Jun Lee","doi":"10.5757/ASCT.2021.30.3.92","DOIUrl":"https://doi.org/10.5757/ASCT.2021.30.3.92","url":null,"abstract":"In high current implantation, improving the ion extractability is a decisive factor contributing to the equipment efficiency and process cost reduction. A direct current filament ion source and inductively coupled plasma ion source were prepared to observe the degree of plasma extraction according to the ion source characteristics. The plasma parameters used to optimize beam extraction for the filament and RF discharges were 600 W, Ar 2 × 10 −5 Torr, and Ø200 × 250 mm discharge space. In the thermionic ion source, the ion density, electron temperature, and Bohm current density were 5 × 10 9 1/cm 3 , ≥ 6 eV, and ≈ 3.5 A/m 2 , respectively. In the RF ion source, the ion density, electron temperature, and Bohm current density were approximately 5 × 10 10 1/cm 3 , ≈ 3 ∼ 4 eV, and ≈ 25 A/m 2 , respectively. Optimization and analysis of ion extraction according to the plasma and accelerator parameters were calculated using IBSimu. The beam emittance, which is the most important parameter of the ion beam quality, was measured as the beam envelope onto the phase space by an ellipse. A change in the plasma meniscus shape was observed according to the plasma parameters in the ion source, and the emittance of the extracted ion beam was calculated according to the electrode gap distance and aperture structure.","PeriodicalId":8223,"journal":{"name":"Applied Science and Convergence Technology","volume":"70 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76541235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Numerical Simulation of Thermal Flow Characteristics in Plasma Reactor for Rotten Citrus Fruits Drying 柑桔腐烂果实干燥等离子体反应器热流特性数值模拟

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Applied Science and Convergence Technology Pub Date : 2021-05-31 DOI: 10.5757/ASCT.2021.30.3.70

Hye-Young Ko, Dong H. Shin, Jeong-Hwan Oh, Hyeokjun Kang, Daeun Choi, S. Choi

{"title":"Numerical Simulation of Thermal Flow Characteristics in Plasma Reactor for Rotten Citrus Fruits Drying","authors":"Hye-Young Ko, Dong H. Shin, Jeong-Hwan Oh, Hyeokjun Kang, Daeun Choi, S. Choi","doi":"10.5757/ASCT.2021.30.3.70","DOIUrl":"https://doi.org/10.5757/ASCT.2021.30.3.70","url":null,"abstract":"Rotten citrus fruits, which spread odor gas during shipping season, pose a severe problem in Jeju Island, Republic of Korea. The existing methods for food waste management such as composting using electro-drying and microorganisms have a high electricity cost and require a precise temperature control, respectively. Herein, we conducted a basic numerical study on a plasma reactor using microwave plasma and liquefied petroleum gas as a combined heat source for drying and composting rotten citrus fruits. To determine the design and operating conditions of the plasma reactor, the thermal flow characteristics inside the reactor were analyzed using a computational fluid dynamics code in ANSYS-fluent. In particular, the temperature distribution in the plasma reactor was simulated at different air flow rates of the centrifugal fan. The numerical simulation accuracy was evaluated by comparing the numerical results and actual experimental data. The temperature of the reactor decreased with the increase in the air flow rate of the centrifugal fan. Above 10 m/s, the temperature of the drying chamber and the exhaust gas remained almost constant at 507 K. In the present work, the calculated temperature shows a difference 1.13 % from the measured temperature at the combustion chamber. were caused by the latent heat of water vaporization. The numerical simulation, however, show the correct prediction in the combustion chamber where the heat is suppled and provides reasonable trend of the temperature distribution according to the fresh air supply in the centrifugal fan. Using the simulation results of this study, the oper- ating condition of the plasma reactor as a treatment facility for rotten citrus fruits in Jeju Island are derived and it can be used as basic data for research on food waste disposal facilities.","PeriodicalId":8223,"journal":{"name":"Applied Science and Convergence Technology","volume":"10 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2021-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82104018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Growth and Optical Absorption of CoIn2S4 Thin Films by Spray Pyrolysis Method 喷雾热解法制备co2s4薄膜及其光吸收

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Applied Science and Convergence Technology Pub Date : 2021-05-31 DOI: 10.5757/ASCT.2021.30.3.74

Changdae Kim

引用次数: 0