• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 하계학술대회 논문집 Vol.4 No.1
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• pp.256-258
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• 2003

Two Si wafers are bonded with indium-silver alloy using diffusion bonding method. When silver and indium thin films are contacted, they diffuse into each other and form inter-metallic compounds like $AgIn_2$, $Ag_2In$, $Ag_3In$ etc. These compounds are determined by ratio of two metals. From phase diagram of Ag-In alloy, we can get the ratio of $Ag_2In$, that has high melting point about 700$^{\circ}C$, approximately 2:1. This ratio was made by controlling of film thickness. And bonding was executed by annealing and adding pressures at a time. The joint of these wafers had been observed by SEM. And we had also seen the EDS (Energy Dispersive Spectroscopy) data to analysis the component of samples.

• 박물관보존과학
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• 제7권
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• pp.33-42
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• 2006

국립중앙박물관 보존과학실은 소장품의 유물상태에 따라 보존처리 우선순위 등급을 작성하였고, 2006년부터 연차적인 보존처리를 수행해오고 있다. 본 논문은 그 중 천목다완(신도1961)의 결손된 부분을 새로이 개발한 신복원재료를 사용하여 복원하는 과정을 소개하고 일부 박락된 유약층은 LIBS와 SEM-EDS분석기기를 사용하여 천목다완의 독특한 문양을 나타내는 유약성분을 분석하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1999년도 춘계학술대회 논문집
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• pp.513-517
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• 1999

High voltage motor(rated 6.6kV and 448kw) has failed in the stator endwinding area during normal service. Experiments on microstructure property were conducted using the control and aged insulations, which were drawn out from stator windings of the high voltage motor. The analyses were characterized using stereozoom microscope(SM), scanning electron microscope(SEM) and energy dispersive X-ray spectroscopy(EDS). SM result shows that large voids are present in the interface between turn insulation and groundwall insulation. SEM results indicated that the groundwall insulation is rarely thermal stress. EDS results showed that chemical elements in the high voltage motor stator insulations were Al, Si, O, K and Fe.

• 한국환경과학회지
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• 제33권5호
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• pp.297-304
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• 2024

PM (Particulate Matters) was collected from a bag filter dust collector at an aluminum foundries, and its physicochemical properties were investigated using particle size analyzer and scanning electron microscopy with energy dispersive X-ray spectrometer (SEM/EDS). The median volume diameter of the particles passing through the pretreatment dust collector of the cyclone was approximately 10 ㎛. The cyclone pretreatment dust collector was shown to significantly reduce the throughput of large particles with a particle size of 100 ㎛ or more. The chemical composition of the particles showed a high Al content, and trace amounts of Mg, Si, and Zn were detected.

• 한국결정성장학회지
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• 제19권2호
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• pp.90-94
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• 2009

Mong Hsu rubies from Myanmar were heat treated in oxidizing(oxygen) atmosphere at $1650^{\circ}C$ for 1 hour. The investigations of the micro-structural defects in the samples before and after heat treatment have been carried out by the variety of analysis techniques of FTIR, UV-VIS-NIR and SEM-EDS. It was found that after heat treatment the dark blue cores region were disappeared and turned to orange red color with the presence of the dense cloudy brownish colored tiny particles in and near former blue zoning. As-received ruby samples only revealed the presence of FTIR absorption peaks of diaspore, boehmite and O-H stretching, at 1986, 2115 and $3078/3319\;cm^{-1}$ respectively. The UV-VIS-NIR absorption of as-received and heat treated ruby samples similarly showed peaks at 405, 554 and 693 nm associated with $Cr^{3+}$, but for the same samples, the absorption peak of heat-treated ruby samples at 693 nm was somewhat stronger than that of the untreated ruby samples. Especially the presence of $Cr^{3+}$ peaks at 659 and 675 nm was found obviously in as-received ruby samples only. The SEM-EDS investigation disclosed the micro-porous defect structures commonly related to the core regions of the untreated ruby samples, which after heat treatment in an oxidizing environment those defect features have been dissolved into the host phase resulting in the lightening or disappearance of the dark coloration of ruby core.

• KSBB Journal
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• 제15권3호
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• pp.254-261
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• 2000

공시균주인 Thiobacillus ferrooxidans(ATCC 19859)와 광양의 폐광산수에서 분리한 Thiobacillus KY를 이용하여 황칠광(pyrite, FeS2)에 대하여 30일간 침출반응하여 반응시간에 따른 황철광의 표변특성 변화를 관찰하였다. Thiobacillus ferrooxidans (ATCC 19859)의 경우 반응시간 20일 경과 후Thiobacillus KY는 반응 시간 10일 후 각각 황철광 표변에 결정구조의 변화가 관찰되었 다. FezS의 결합에서 S-Fe-S의 결합이 끊어점에 기언하는 [311] 평면의 상대적으로 감소와 침출시간 증가에 따른 [111]평면과 [220]의 상대적으로 노출의 증가의 특정을 나타냈다. SEM-EDS 결과 침출시키기 전의 시료는 Fe 36.97%, S 45.71%, Si 16.94% 이며 반응이 진행됨에 따라 황성분의 비율이 증가하였다. 또한 노출된 황칠광 위에 칩착물은 S 59.56%, Fe 38.9%, Si 1.53%의 원지구성비를 가진 물질이었다. 이러한 결과로 부터 침출이 진 행되면서 결정구조의 변화와 황과 철의 침착물에 의하여 황철광 의 표면이 비활성화된다는 결론을 도출할 수 있다.

• 박물관보존과학
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• 제13권
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• pp.45-49
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• 2012

창원 다호리 유적 6호분에서 출토된 유리구슬편 14점에 대하여 과학적인 분석을 실시하였다. 유리편은 대부분 감청색의 투명한 유리로 원형의 기포들이 일정한 방향으로 나열되어 있다. SEM/EDS 분석결과 유리편은 모두 포타쉬유리군(K₂O-SiO₂)이며 CaO 및 Al₂O₃의 함량은 모두 5%이하인 LCA(Low CaO, Low Al₂O₃)계 유리로 확인되었다. 또한 포타쉬원료는 식물제를 정제하거나 광물(초석, KNO₃)을 사용한 것으로 판단되며 감청색을 내는 발색제로 작용하는 성분은 CuO의 영향이 큰 것으로 판단된다.

• Restorative Dentistry and Endodontics
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• 제43권1호
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• pp.11.1-11.10
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• 2018

Objectives: This study aimed to introduce the use of laser-induced breakdown spectroscopy (LIBS) for evaluation of the mineral content of root canal dentin, and to assess whether a correlation exists between LIBS and scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS) methods by comparing the effects of irrigation solutions on the mineral content change of root canal dentin. Materials and Methods: Forty teeth with a single root canal were decoronated and longitudinally sectioned to expose the canals. The root halves were divided into 4 groups (n = 10) according to the solution applied: group NaOCl, 5.25% sodium hypochlorite (NaOCl) for 1 hour; group EDTA, 17% ethylenediaminetetraacetic acid (EDTA) for 2 minutes; group NaOCl+EDTA, 5.25% NaOCl for 1 hour and 17% EDTA for 2 minutes; a control group. Each root half belonging to the same root was evaluated for mineral content with either LIBS or SEM/EDS methods. The data were analyzed statistically. Results: In groups NaOCl and NaOCl+EDTA, the calcium (Ca)/phosphorus (P) ratio decreased while the sodium (Na) level increased compared with the other groups (p < 0.05). The magnesium (Mg) level changes were not significant among the groups. A significant positive correlation was found between the results of LIBS and SEM/EDS analyses (r = 0.84, p < 0.001). Conclusions: Treatment with NaOCl for 1 hour altered the mineral content of dentin, while EDTA application for 2 minutes had no effect on the elemental composition. The LIBS method proved to be reliable while providing data for the elemental composition of root canal dentin.

• 한국해양공학회지
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• 제10권2호
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• pp.77-87
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• 1996

The estimation of the remaining life for the aged components in power plant as well as chemical and peroleum plants has been recently coberned. The raw materials used in this syudy are the 1Cr-1Mo-0.25V rotor steel which intensified P and S compositions along with the nominal compositions of ASTM A470 standard. Five kinds of specimens with the different degradation levels were prepared by isothermal aging teat treatment at $630^{\circ}C$ The mechanical properties and fatigue strength of virgin and aged 1Cr-1Mo-0.25V rotor steel have been inbestigated through the hardness, tensile, fatigue test, SEM fractograph and EDS analysis at room temperature. Thus, the data of aged specimens were compared with those of virgin specimen to evaluate the aging effects. The main results obtained in this study are as follows; The decrease of the hardness due to degradation was distinguished until 50, 000hrs simulated service time. And is was confirmed that the considerable amount of P, Mn, Cr and S was precipitated at the grain boundary of aged material through the SEM and EDS analysis. The fatigue strength of 25, 000, 50, 000, 75, 000 and 100, 000hrs aged material was decreased 29.5%, 24.4%, 28.6%, 35.7% than that of virgin material at $10^7$ cycles of room temperature. The major cracks of virgin and aged materials initiated at the inclusions including Si, P and Mn compositions which were located at the outer periphery of the specimen.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제40권
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• pp.19.1-19.6
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• 2018

Background: Calcium pyrophosphate dihydrate deposition disease (CPDD) is a rare disease in the temporomandibular joint (TMJ) space. It forms a calcified crystal mass and induces a limitation of joint movement. Case presentation: The calcified mass in our case was occupied in the left TMJ area and extended to the infratemporal and middle cranial fossa. For a complete excision of this mass, we performed a vertical ramus osteotomy and resected the mass around the mandibular condyle. The calcified mass in the infratemporal fossa was carefully excised, and the segmented mandible was anatomically repositioned. Scanning electronic microscopy (SEM)/energy-dispersive X-ray spectroscopy (EDS) microanalysis was performed to evaluate the calcified mass. The result of SEM/EDS showed that the crystal mass was completely composed of calcium pyrophosphate dihydrate. This result strongly suggested that the calcified mass was CPDD in the TMJ area. Conclusions: CPDD in the TMJ is a rare disease and is difficult to differentially diagnose from other neoplasms. A histological examination and quantitative microanalysis are required to confirm the diagnosis. In our patient, CPDD in the TMJ was successfully removed via the extracorporeal approach. SEM/EDS microanalysis was used for the differential diagnosis.