• Title/Summary/Keyword: EDS analysis

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The analysis of field condition for GIS partial discharge using PD Counter (PD 카운터를 이용한 GIS 부분방전 현장조사결과 분석)

  • Jeong, Jae-Ki;Yoon, Si-Young;Moon, Jong-Hun
    • Proceedings of the KIEE Conference
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    • 2008.04b
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    • pp.174-175
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    • 2008
  • 초고압 변전소의 주요설비인 가스절연개폐장치(GIS: Gas Insulated Switchgear)의 신뢰도를 높이기 위해서는 절연체 내부에서 발생하는 부분방전을 사전에 진단하여 예방을 하는 것이 중요하다. 현재 이에 대한 진단장치 개발이 이루어지고 있으며 GIS On-line System 장치 및 휴대용 진단장비가 국내에서 제작되고 있으나 On-line System은 고가의 비용이 들고 휴대용 진단장비는 상시감시가 어렵다는 단점을 가지고 있다. 이러한 단점을 보완하기 위해서 본 연구내용에서는 저가이면서 상시 PD 감시능력을 가진 PD 카운터에 대해 설명하고 GIS 현장에 실제 적용한 자료와 휴대용 진단장비와 함께 비교 적용한 자료를 가지고 PD 카운터의 특성을 확인하는데 역점을 두었다.

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Temperature-Dependent Thermal and Chemical Stabilities as well as Mechanical Properties of Electrodeposited Nanocrystalline Ni

  • Zheng, Liangfu;Peng, Xiao
    • Metals and materials international
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    • v.24 no.6
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    • pp.1293-1302
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    • 2018
  • Nanocrystalline (NC) Ni electrodeposits (EDs) with a mean grain size of $34{\pm}12nm$ has been investigated, from room temperature to $800^{\circ}C$ under a purge gas of argon, by both non-isothermal and isothermal differential scanning calorimetry measurements, in combination with characterization of temperature-dependent microstructural evolution. A significant exothermic peak resulting from superimposition of recrystallization and surface oxidation occurs between 340 and $745^{\circ}C$ at a heating rate of $10^{\circ}C/min$ for the NC Ni EDs. The temperatures for recrystallization and oxidation increase with increasing the heating rate. In addition, recrystallization leads to a profound brittle-ductile transition of the Ni EDs in a narrow range around the peak temperature for the recrystallization.

Defect analysis of fabricated glass by passive pot furnace (수동 도가니로에서 제조된 유리제품내 결함 분석)

  • 윤태민;윤영진;이용수;강원호
    • Proceedings of the KAIS Fall Conference
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    • 2002.05a
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    • pp.70-73
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    • 2002
  • 도가니로를 사용하여 유리제품을 생산하고있는 중소 유리제조업체인 D.H사의 제품내 발생한 결함을 분석하였다. 제품내 결함으로는 기포, 코드(cord), 석물(stone)이 발생하고 있었으며, 광학현미경, EDS 등의 분석장비를 통해 제품내 결함을 분석한 결과 코드는 석물에 의해 발생하고 있음을 확인하였다. 석물의 EDS 분석결과 주요성분은 Si로 나타났으며, 이는 도가니의 장기간 사용시 도가니 내벽과 유리물의 반응에 의한 도가니의 용융침식에 의해 발생한 한가지 결점원에 의한 한가지 결정상으로 SiO₂의 고온결정상인 cristobalite임을 확인할 수 있었다.

Morphology and Chemical Composition Analysis of Individual Particles at Large Anthropogenic Emissions by SEM-EDS (인위적 대형 배출원에서 SEM-EDS법을 이용한 개별 입자상 물질의 형태와 화학적 조성 분석)

  • 양수명;박정호;정재우;서정민;최금찬
    • Proceedings of the Korea Air Pollution Research Association Conference
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    • 2003.11a
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    • pp.368-369
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    • 2003
  • 각종 배출원에서 배출된 입자상 물질은 대기 중 확산, 이동, 침착 등을 통해 국지적 도시오염 뿐만 아니라 장거리까지도 이동함으로서 광역적 대기오염의 원인이 되고 있는 등 입자상 물질의 발생원 추적에 관한 연구가 필요한 실정이다. 지금까지 입자상 물질의 발생원 추적은 대부분 배출원의 발생량 조사나 필터에 포집된 시료의 전체적인 화학적 분석의 개념으로 단시간의 시간변동과 개개의 입자가 가지는 정보가 무시되고 평균화되고 있다. (중략)

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Failure Analysis of Filaments of Quadrupole Mass Spectrometer for Plasma Process Monitoring

  • Ha, Sung Yong;Kim, Dong Hoon;Joo, Junghoon
    • Applied Science and Convergence Technology
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    • v.24 no.5
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    • pp.142-150
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    • 2015
  • A failure analysis of tungsten filaments used in quadrupole mass spectrometer for plasma process monitoring was carried by using SEM and EDS. Failed at high temperature, filaments showed two kinds of failure modes. The one is that diameter of filament became thinner gradually and finally snapped. The other is that filament abruptly snapped almost at a right angle. The EDS analysis showed Fe and C, including W and Fe, on the surface of failed filament. when failed filaments were treated with plasma in mixture of Ar and $CF_4$, the amount of Fe and C decreased. The failure analysis of filament showed that the cause of filament failure is thermal evaporation and grain growth of tungsten at high temperature.

Investigation on Dissolution and Removal of Adhered LiCl-KCl-UCl3 Salt From Electrodeposited Uranium Dendrites using Deionized Water, Methanol, and Ethanol

  • Killinger, Dimitris Payton;Phongikaroon, Supathorn
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.18 no.4
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    • pp.549-562
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    • 2020
  • Deionized water, methanol, and ethanol were investigated for their effectiveness at dissolving LiCl-KCl-UCl3 at 25, 35, and 50℃ using inductively coupled plasma mass spectrometry (ICP-MS) to study the concentration evolution of uranium and mass ratio evolutions of lithium and potassium in these solvents. A visualization experiment of the dissolution of the ternary salt in solvents was performed at 25℃ for 2 min to gain further understanding of the reactions. Aforementioned solvents were evaluated for their performance on removing the adhered ternary salt from uranium dendrites that were electrochemically separated in a molten LiCl-KCl-UCl3 electrolyte (500℃) using scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS). Findings indicate that deionized water is best suited for dissolving the ternary salt and removing adhered salt from electrodeposits. The maximum uranium concentrations detected in deionized water, methanol, and ethanol for the different temperature conditions were 8.33, 5.67, 2.79 μg·L-1 for 25℃, 10.62, 5.73, 2.50 μg·L-1 for 35℃, and 11.55, 6.75, and 4.73 μg·L-1 for 50℃. ICP-MS analysis indicates that ethanol did not take up any KCl during dissolutions investigated. SEM-EDS analysis of ethanol washed uranium dendrites confirmed that KCl was still adhered to the surface. Saturation criteria is also proposed and utilized to approximate the state of saturation of the solvents used in the dissolution trials.

A study on cleaning performance of particles on collection plates using an electrodynamic screen (전기역학적 스크린을 이용한 집진판 표면 위 입자 세정성능 연구)

  • Yunhui Joe;Dongho Shin;Younghun Kim;Inyong Park;Sang Bok Kim;Gunhee Lee;Bangwoo Han
    • Particle and aerosol research
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    • v.19 no.3
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    • pp.63-76
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    • 2023
  • An electrostatic precipitator (ESP) has a low pressure drop and a high collection efficiency but its collection efficiency can be reduced due to dust accumulation on the collection plates during long-term operations. In order to maintain the initial dust collection efficiency, it is necessary to periodically clean the collection plates. The common cleaning methods are using physical impacts or water sprays. These cleaning methods can lead to damage to the collection plate or generate wastewater. Herein, we implemented an electrodynamic screen (EDS) for ESP cleaning and evaluated its surface cleaning performance of particles. The EDS is an electrostatic system that can electrostatically repel particles on surfaces, allowing it to clean the ESP without causing damage and wastewater generation. Our evaluation included the analysis of the effects of AC voltage characteristics, electrode configuration and environmental conditions on the cleaning performance of the EDS with the aim of achieving effective surface cleaning. It has been demonstrated that activating the EDS cleans up to 65% of the particles on the surface, which indicates about 94% of our target cleaning zone.

Morphology and Chemical Composition Analysis of Human Cremated Ash by SEM/EDS (SEM/EDS를 이용한 화장 분골의 형태와 성분 분석)

  • Hwang, Kyu-Sung;An, Woo-Hwan;Kim, Jeong-Lae
    • The Journal of the Convergence on Culture Technology
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    • v.1 no.2
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    • pp.65-69
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    • 2015
  • Teeth and bones are very resistance to high temperatures and remain recognizable even after prolonged exposures to heat. The effects of heating and burning on teeth have been studied with the aim of discerning a characteristic signature withstanding high temperature, but there have been few studies about a human cremated ash, especially Korea. We are recognizable by elemental composition and can be detected in human cremated ash samples by Scanning electromicroscopy/Energy dispersive X-ray spectrometry analysis(SEM/EDS), cremated, at $800{\sim}900^{\circ}C$ for 1 hour. In this temperature range, different crystals morphologies(spherical, irregular and hexagonal) are observed in SEM. Calcium(Ca) and oxygen(O) increases steadily after cremation in EDS. We suggest that cremated bone have been provided with calcium oxide(CaO) formation at temperature above $900^{\circ}C$. This study offers basic data to assess the structure and elemental compositions of human ash and to determine if these remain identifiable after exposure to extreme temperatures.

Anatomical Characteristics and Trace Elements of Historical Papers and Cloths from Neunggasa Temple in Korea (능가사 출토 종이와 섬유의 해부학적 성질 및 미량원소 분석)

  • Wazny, Agnieszka Helman;Park, Won-kyu
    • Journal of Conservation Science
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    • v.10 no.1 s.13
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    • pp.1-9
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    • 2001
  • The objective of this study is to examine the characteristics of historical papers and cloths found at Neunggasa temple, Goheunggun, Chonnam Province, Korea, using light microscopy, image analysis and SEM-EDS for fiber morphology and trace metal composition. All papers were made from paper mulberry. Transparent membrane, which was separated from bast fiber, was unique in these fibers. The papers found on the wall of Daewungjun were most highly degraded and those of the books, which were excavated under Cheungwangmun, were relatively well preserved. The cloths found under the statue 'Dong-bangjiguk' were silk, very narrow fiber without any marks. In the analysis of SEM-EDS, high content of silica was detected. Also small content of calcium was taken into consideration. Content of iron and chlorine were discussed from the viewpoint of potentially harmful elements for the conservation of paper. The composition of trace elements could not be used to determine the origins of papers.

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Application Study of Raman Micro-Spectroscopy for Analysis on Corrosion Compound of Iron Artifacts (철제유물 부식화합물 분석의 표준데이터 확보를 위한 라만 분광법 적용성 연구)

  • Park, Hyung Ho;Lee, Jae Sung;Yu, Jae Eun
    • 보존과학연구
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    • s.32
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    • pp.89-98
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    • 2011
  • It is quite difficult to identify its corrosion compound because they have a wide variety of crystal structures and they are mixed with two component. This study was conducted with the standard iron corrosion compounds through the analysis by Raman Micro-Spectroscopy, which aims to obtain standard Raman Data. To assess the reliability of standard iron corrosion compounds, SEM-EDS analysis and XRD analysis were conducted. Through SEM-EDS analysis, the elements of corrosion compound matched with those of standards iron corrosion compounds except Goethite. XRD analysis showed that the structures of corrosion compounds were identical to those of standard iron corrosion compounds, however, it was identified that Iron sulfate ($FeSO_4{\cdot}6H_2O$) is the Rozenite ($FeSO_4{\cdot}4H_2O$). Through Raman Micro-Spectroscopy analysis, the new peak was detected from the wavenumbers of hydroxide and iron oxide. It is considered that it is due to changes in the wavelength of the laser. As the wavenumbers of iron chloride and iron sulfate have been identified, eight kinds of Raman Data were obtained. It can be considered to contribute to cultral heritage for iron objects that Raman Micro-Spectroscopy analysis which is relatively easy to compare material properties and structures can be highly applicable to the research on cultural heritage with the limited amount of samples.

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