• Title, Summary, Keyword: SEM Observation

Search Result 730, Processing Time 0.039 seconds

Observation of Dynamic Domain Patterns using Lorentz SEM (로렌츠 SEM을 이용한 동적자구 모양의 관찰)

  • ;K. I. Arai
    • Journal of the Korean Magnetics Society
    • /
    • v.5 no.5
    • /
    • pp.885-891
    • /
    • 1995
  • This paper discussed on the observation of dynamic domain patterns using Lorentz SEM in the frequency region of 50 Hz-10 kHz. The observed dynamic domain patterns were compared with the simulated ones. The observation rrethod is characterized by using the slight difference between the exciting frequency and the multiples of the scannning frequency of SEM.

  • PDF

Observation of Shrinkage Features of Cross Sectional Surface of Wood by LV-SEM (저진공주사현미경(LV-SEM)을 이용한 목재횡단면의 수축거동관찰)

  • Kang, Chunwon;Matsumura, Junji;Kang, Wook
    • Journal of the Korean Wood Science and Technology
    • /
    • v.36 no.3
    • /
    • pp.17-23
    • /
    • 2008
  • The purpose of this study is to estimate the shrinkage of wood by LV-SEM (Low-Vacuum Scanning Electron Microscope) which can observe wetted wood sample. The shrinkage of small sample specimen by the dehumidification in the specimen chamber was investigated and compared with that of normal wood specimen. The observation of cross sectional surface of wood from wetted condition to dried condition can be achieved in about twenty minutes by means of the dehumidification in the specimen chamber of LV-SEM. The volumetric shrinkage of earlywood was almost the same as that of latewood. The shrinkage of SEM observation specimen was similar to that of normal wood specimen. From the correlation of the shrinkages between SEM observation specimen and normal wood specimen, it is surmised that the shrinkage of wood is more strictly dominated by shrinkage of latewood than that of earlywood.

Characterization of Burned Architectural Woods by Fire Using SEM-EDXS and Computerized Tomography

  • Lee, Hyun-Mi;Hwang, Won-Joung;Lee, Dong-Heub;Son, Dong-Won
    • Journal of the Korean Wood Science and Technology
    • /
    • v.42 no.5
    • /
    • pp.516-522
    • /
    • 2014
  • Old architectural wood materials damaged by a fire were evaluated on the basis of wood species and scanning electron microscopy (SEM) observation of wood tissues in combination with energy dispersive X-ray spectroscopy (EDXS) analysis. Results of SEM observation showed that tracheid wall thickness of burned parts was very thin compared with undamaged and sound wood, and tylosoid in the resin canals disappeared after the exposure to fire. SEM-EDXS analysis indicated that carbon and oxygen peaks occurred in the original energy band, and the carbon peak was higher than that of the oxygen in the burned part. A computerized tomography was also undertaken to investigate the carbonization layer formed by fire and possible internal defects.

SEM Observation for the Damage of Inner Hair Cell Stereocilia of Guinea Pig Cochlea after Loud Tone Exposure (격음노출 후 기니픽 달팽이관 내유모세포 부동섬모에 관한 SEM(전자투사식현미경) 관측)

  • Jarng Soon Suck
    • The Journal of the Acoustical Society of Korea
    • /
    • v.24 no.1E
    • /
    • pp.1-6
    • /
    • 2005
  • The inner hair cell stereocilia of the guinea pig cochlea was examined under a scanning electron microscope (SEM) after loud tone exposure onto the ear drum of the animal. Before and after guinea pigs were exposed to intensive and continuous tone such as 106 dB SPL in intensity, the functioning of the cochlea was monitored by N1-N2 audiograms. The structural damage of the stereocilia of inner hair cells (IHCs) and outer hair cells (OHCs) was examined using the SEM in x 1500 magnification. The comparison between the functional change of the cochlea and the structural damage of the IHC stereocilia is done by means of photographic observation. It can be shown that the functional change might be related to the structural damage of the IHC stereocilia after intensive acoustic trauma.

Evaluation on Welding Characteristic of Ni-Cu Sheet by Ultrasonic Machining (초음파 가공에 의한 Ni-Cu 박판의 용착 특성 평가)

  • Back, Si-Young;Jang, Sung-Min
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.12 no.3
    • /
    • pp.1070-1077
    • /
    • 2011
  • This paper is studied on the influence of machining conditions on weldability obtained by ultrasonic machining. The weldability estimation of dissimilar Ni-Cu sheets with the optimization of one-wavelength horn is confirmed by the use of ultrasonic machining. The optimal welding condition with tensile test by setting the ultrasonic machining parameters is suggested and the weldability is estimated by SEM observation and EDX-ray analysis. Experimental studies are worked with the measure of tensile strength and the analysis of SEM photograph after the ultrasonic machining of workpiece. Machining parameters of machining time, pressure, and amplitude are also applied to this paper.

A study of dental calculus scanning electron microscopic by observation bacteria identification (치석의 주사전자현미경 관찰 및 세균동정에 관한 연구)

  • Jang, Gye-Won
    • Journal of Korean society of Dental Hygiene
    • /
    • v.7 no.2
    • /
    • pp.189-196
    • /
    • 2007
  • A study of the J health college dept of dental hygiene practice vistant a total of 35 supragingival calculus and subgingival calculus picking SEM observation and bacteria identification of the result are followings. 1. As observed by dental calculus SEM, the surface roughness appeared as peaks, valleys, and pits. 2. About bacteteria morphology blood agar plate small green zone partial hemolysis colony streptococcus observation 3. Isolated colony gram stain gram are positive display 4. Supragingival calculus at Lactococcus lactis spp. Leuconostoc spp. Streptococcus mitis, Aerococcus viridans bacteria 1, 3, 3, 16 species detection 5. Subgingival calculus at Aerococcus viridans, Leuconostoc spp. bacteria 5, 1 species detection.

  • PDF

A Study on the Allowable Stress of TiN Coating During Repeated Sliding Condition by In-situ System (미끄럼반복마찰의 직접관찰에 의한 TiN피막의 허용응력에 관한 연구)

  • Moon, Bong-Ho
    • Tribology and Lubricants
    • /
    • v.27 no.3
    • /
    • pp.147-155
    • /
    • 2011
  • The ceramic coatings are excellent materials of cutting tools and sliding parts. To evaluate the wear characteristics of very thin ceramic coated layer, it is very important to investigate its wear process microscopically. An effective method for investigating the wear of a thin layer is the observation of wear process in microscopic detail using in-situ system. In this study, using the SEM Tribosystem as in-situ system, the microscopic wear mode of TiN coatings was investigated in repeated sliding. As results, four modes were observed for TiN coatings: Ploughing, powder formation, flake formation and coating delimitation. The observation of the microscopic wear by in-situ system can clarify the allowable stress of TiN coating.

The Effect of Corona Treated on Laminating Film and Its Analytical Study by SEM (라미네이팅 필름의 코로나 처리 효과와 주사 전자현미경을 이용한 해석)

  • Kim, Jong-Gyu;Kim, Yang-Pioung
    • Journal of the Korean Printing Society
    • /
    • v.26 no.2
    • /
    • pp.15-30
    • /
    • 2008
  • Studies were carried out the phenomenal observation on the effect of corona treated hotmelt laminating film in process of manufacture by 2 kinds of experiments. These are as follow: 1) In order to verify the treatment reducing value of dynes and dynes durability with the lapse of time, it was checked dynes of a pair of 4 bar discharge electrode with 9 one for 144 hr., and it show results that 9 bar discharge electrode has higher initial dynes as well as keep up 48 dynes durability long than 4 one. 2) Drawn an inference from 3 actions -Chemical-Physical-Mechanical, on laminating film in terms of SEM's observation that are the adhesive status in boundary of corona treated base film, extrusion coating hotmelt layer, and configuration of hotmelt surface after corona treated. In tandem system, EVA layers adhesion keep its stability without corona discharge treatment.

  • PDF

Identification and morphology of scanning electron microscopy(sem) of bacteria isolated from dental biofilm (덴탈 바이오필름에서 분리한 세균의 주사전자현미경적 관찰 및 동정)

  • Jang, Gye-won
    • Journal of Korean society of Dental Hygiene
    • /
    • v.8 no.4
    • /
    • pp.241-250
    • /
    • 2008
  • In this study, specimens such as tongue, supragingival and subgingival biofilm were taken from total 20 scaling subjects who visited the oral prophylaxis practice lab at department of dental hygienics, J Health College in order to observe bacterial distributions and morphology using scanning electron microscopy(sem). as a result, this study came to the following conclusions: 1. According to observation of tongue, supragingival and subgingival biofilm through sem, it is found that there are round colonies of gram-positive cocci and gram-negative bacilli on blood agar medium. 2. The observation of bacterial morphology on dental biofilm through sem, cocci in chain cocci in cluster and bacillus(rod) respectively. 3. For tongue biofilm, it is found that a variety of bacterial species are detected, such as Granulicatolla adiacens(1), Gemella morbillorum(3), Streptococcus mitis(2), Streptococcus sanguinis(1), Aerococcus viridans (2), Streptococcus equinus(1), Leuconostoc spp.(1), Gemella haemolysans (1) and Lactococcus lactis spp.(1) respectively. 4. For supragingival biofilm, it is found that a variety of bacterial species detected, such as Aerococcus viridans(1), Gemella haemolysans(2), Leuconostoc spp.(2), Gemella morbillorum(1) and Pseudomonas fluoescens (1) respectively. 5. For subgingival biofilm, it is found that a variety of bacterial species detected, such as Leuconostoc spp.(1), Staphylococcus lugdunensis(1) and Streptococcus salivarius(1) respectively.

  • PDF