• 제목/요약/키워드: Scanning Electron Microscope

검색결과 2,916건 처리시간 0.116초

Influence of Angle Ply Orientation on the Flexural Strength of Basalt and Carbon Fiber Reinforced Hybrid Composites

  • Mengal, Ali Nawaz;Karuppanan, Saravanan
    • Composites Research
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    • 제28권1호
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    • pp.1-5
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    • 2015
  • In this paper the influence of fiber orientation of basalt and carbon inter-ply fabrics on the flexural properties of hybrid composite laminates was experimentally investigated. Four types of basalt/carbon/epoxy inter-ply hybrid composite laminates with varying angle ply orientation of reinforced basalt fiber and fixed orientation of carbon fiber were fabricated using hand lay-up technique. Three point bending test was performed according to ASTM 7264. The fracture surface analysis was carried out by scanning electron microscope (SEM). The results obtained from the four laminates were compared. Lay-up pattern of $[0B/+30B/-30B/0C]_S$ exhibits the best properties in terms of flexural strength and flexural modulus. Scanning electron microscopy results on the fracture surface showed that the interfacial de-bonding between the fibers and epoxy resin is a dominant fracture mode for all fiber lay-up schemes.

포토닉 밴드갭 광결정의 제작과 선형 및 비선형 광학 특성 연구 (Fabrication and Linear & Nonlinear Optical Characterization of Photonic Crystals)

  • Ha Na Yeong;U Yeon Gyeong;Hwang Ji-Su;Jang Hye-Jeong;Park Byeong-Ju;U Jeong-Won
    • 한국광학회:학술대회논문집
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    • 한국광학회 2002년도 하계학술발표회
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    • pp.162-163
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    • 2002
  • 1-D photonic band-gap structure is identified in a cholesteric liquid crystal system. The optical transmission spectrum is measured and compared with the theoretical analysis. Nonlinear transmission is measured near the band edge. Also 3-D photonic band-gap structures are fabricated from dielectric colloidal polystyrene beads through a centrifuge method. The fabricated photonic crystals exhibit opalescent colors under white light and show a clear diffraction peak dependent on the incident angle of the light beam. Also the scanning electron microscope image was taken to verify the face-centered cubic crystal structure. Bragg's law and Snell's law are employed to describe the position of angle resolved diffraction peaks. It was shown that the optically deduced effective refractive index and lattice constants were in good agreement with the crystal structure identified by scanning electron microscope.

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Polymerization of Tetraethoxysilane by Using Remote Argon/dinitrogen oxide Microwave Plasma

  • Chun, Tae-Il;Rossbach, Volker
    • 한국염색가공학회지
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    • 제21권3호
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    • pp.19-25
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    • 2009
  • Polymerization of tetraethoxysilane on a glass substrate was investigated by remote microwave plasma using argon with portions of nitrous oxide as carrier gas. Transparent layer like a thickness of 0.5 ${\mu}m$ 3 ${\mu}m$ were obtained, differing in chemical composition, depending on plasma power and treatment time as well as on ageing time. In general the milder the treatment and the shorter the ageing was, the higher was the content of organic structural elements in the layer. We have identified that the chemical structure of our samples composed of mainly Si O and Si C groups containing aliphatics, carbonyl groups. These results were obtained by X ray photon spectroscopy, Fourier transformed infrared spectroscopy, and scanning electron microscope combined with Energy dispersive X ray spectroscopy.

SEM을 이용한 나일론피니언의 마멸특성 고찰 (Investigation about the Wear Characteristics of Nylon Pinions Against Steel Gears by SEM)

  • 김충현;안효석;정태형
    • 대한기계학회논문집A
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    • 제26권6호
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    • pp.1159-1168
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    • 2002
  • Power-transmission Nylon pinions against steel gears fur different pitch line velocities was studied with a power circulating gear test rig under unlubricated condition by SEM(Scanning Electron Microscope). The wear characteristics of Nylon pinions varied significantly with the pitch line velocity and applied load. Wear occurred most severely at the regions including pitch circle and root circle of Nylon pinions. It is confirmed that Nylon pinions are able to be used fer power-transmission under limited conditions.

엘라스토머 TPV의 사출성형조건에 따른 기계적 물성 (Behavior of elastomer TPVs' Mechanical Properties According to Injection Molding Conditions)

  • 한성렬;김준형;전승경;이규호;정영득
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2005년도 추계학술대회 논문집
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    • pp.265-268
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    • 2005
  • Thermoplastic elastormer (TPE) has many advantages such as high flexibility, high elasticity and high elongation, etc. TPE is easily molded such as plastic materials, therefore, many TPE parts are applied as home appliances and mechanical parts. However, if TPE is once molded, its mechanical properties are changed by injection molding conditions such as melt temperature, mold temperature, injection pressure and holding pressure, etc. In this study, the influences of the injection molding condition on the mechanical properties of thermoplastic vulcanizates(TPVs), which is one of the TPE, were investigated. By the injection molding experiment, as increasing the melt temperature, the tensile strength, shrinkage and hardness decreased. By the scanning electron microscope (SEM) analyzing the TPVs' crystallization, the morphology was affected by the melt temperature.

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Hypoxylon속 자낭자좌 조직의 형태 연구 (The Tissue Types of Stroma in Some Species of Hypoxylon)

  • 이양수
    • Applied Microscopy
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    • 제27권4호
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    • pp.453-460
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    • 1997
  • 주사 전자현미경상에서 Hypoxylon속 4종(H. archeri, H. bovei, H. fragiforme와 H. stygium)의 자낭자좌 조직 형태를 중점적으로 관찰하였다. 본 연구는 Hypoxylon속의 자낭자좌의 각 층의 조직상 형태를 가장 심도있게 연구하였으며, 이 자낭자좌들은 동결파쇄법에 의하여 종단 및 횡단 절단되었다. 여러 개의 균일 된 자낭자좌 조직의 형태가 속내의 종간에 각기 다르게 형성되었다. 자낭자좌 조직의 형태는 Hypoxylon속의 종 수준에서의 분리동정을 위한 주검색 표로서는 미흡하나 보조 검색 표로는 매우 유용하다.

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Biomedical Applications of Stereoscopy for Three-Dimensional Surface Reconstruction in Scanning Electron Microscopes

  • Kim, Ki Woo
    • Applied Microscopy
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    • 제46권2호
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    • pp.71-75
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    • 2016
  • The scanning electron microscope (SEM) offers two-dimensional (2D) micrographs of three-dimensional (3D) objects due to its inherent operating mechanisms. To overcome this limitation, other devices have been used for quantitative morphological analysis. Many efforts have been made on the applications of software-based approaches to 3D reconstruction and measurements by SEM. Based on the acquisition of two stereo images, a multi-view technique consists of two parts: (i) geometric calibration and (ii) image matching. Quantitative morphological parameters such as height and depth could be nondestructively measured by SEM combined with special software programs. It is also possible to obtain conventional surface parameters such as roughness and volume of biomedical specimens through 3D SEM surface reconstruction. There is growing evidence that conventional 2D SEM without special electron detectors can be transformed to 3D SEM for quantitative measurements in biomedical research.

국내제작 임프란트 고정체와 지대주 유지나사의 적합도에 대한 주사전자현미경적 비교연구 (A STUDY ON FITNESS OF SEVERAL DOMESTIC IMPLANT FIXTURE AND ABUTMENT SCREWS)

  • 박영선;방몽숙;이석형
    • 대한치과보철학회지
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    • 제42권1호
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    • pp.94-109
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    • 2004
  • Statement of problem : Several domestic dental implants have been developed since dental treatment being implants are increasing and popularized. However, they have not been used in domestic market like imported goods. Material and methods : This study was carried out to compare domestic and imported implants in aspect of fitness, dental implant fixture and abutment screw using scanning electron microscope. All experiments were performed under dry condition. Results : 1. Only in aspect of relation of dental implant fkxture and abutment screw, except only one group with point contact, good fitness was existed. 2. Home products must presevere in their efforts, so as excellent to fit.

: IV. A Systematic Revision of the Genus Habronyx Foerster, Therion Curtis and Heteropelma Wesmael by using Scanning Electron Microscope

  • Lee, Jong-Wook;Kim, Chang-Whan
    • 한국동물학회지
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    • 제27권4호
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    • pp.241-254
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    • 1984
  • 맵시벌科 (Ichneumonidae)는 外部形態形質에 있어서 매우 유사한 점이 많아서 種을 同定하거나 硏究하는데 어려움이 많다. 著者들은 走査電子顯微鏡을 利用하여 지금까지 기재되어 있지 않거나 기재가 불충분한 形質들을 찾아서 재기재하였으며, 韓國産 맵시벌科中 Gnues Habronyx (장수자루맵시벌속), Genus Therion (가락지자루맵시벌속)과 Genus Heteropelma (긴가락지자루맵시벌속)을 정리한 결과 未記錄 1종 (Habronyx (Camposcopus) Sonani (Uchida), 1958)을 추가하게 되었다.

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주사전자현미경을 이용한 한국산 개미의 형질특성에 관한 연구(I) -Smithistruma japonica(Ito)의 형질특성에 관하여- (Studies on the Character of Ant(Formicidae) in Korea on the Basis of Scanning Electron Microscope(I) -On the Form-Character of Smithistruma japonica(Ito)-)

  • 김창효;최병문;방종렬
    • 한국응용곤충학회지
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    • 제30권4호
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    • pp.285-290
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    • 1991
  • Dacetini족의 1미기록종이 Smithistruma japonica(Ito)가 거금도에서 채집확인 되었기에 한국명을 톱니비늘개미속 톱니비늘개미로 명명 기재하여 보고하며, 주사전자현미경을 사용하여 비늘개비와 톱니비늘개미의 형질특성 차이에 대하여 기재한다. 한국산 비늘개비족(Dacetini tribe)은 모두 2속 2종이 된다.

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