• 제목/요약/키워드: liquid analyzer

검색결과 212건 처리시간 0.032초

Fe성분이 혼입된 Al-Si 절삭칩 스크랩의 자력선별 및 응고특성 평가 (Magnetic separation of Fe contaminated Al-Si cutting chip scraps and evaluation of solidification characteristics)

  • 김봉환;김준겸;이상목
    • 한국주조공학회지
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    • 제29권1호
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    • pp.38-44
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    • 2009
  • Magnetic separation of Fe contaminated Al-Si cutting chip scraps was performed for the recyclability assessment. It was also aimed to investigate the casting and solidification characteristics of the cutting chip scraps. The magnetically separated cutting chip scraps were adequately treated for the casting procedure and test specimens were made into a stepped mold inducing different cooling rates. The test specimens were evaluated by the combined analysis of ICP, Spectroscopy, OM-image analyzer, SEM/EDS, etc. Solidification characteristics of cutting chip scraps were examined as functions of Fe content and cooling rate. It is concluded that the magnetic separation process can be utilized to recycle the Fe contaminated Al-Si cutting chip scraps in the high cooling rate foundry process.

회절무늬를 이용한 미세물체의 특성 측정 (Characterization of Microscale Objects based on the Diffraction Pattern Analysis)

  • 강기호;전형욱;손정영;오명환
    • 한국광학회지
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    • 제2권1호
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    • pp.1-6
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    • 1991
  • 회절현상을 이용하여 복수 미세 입자의 특성 측정을 위한 격자형의 검지기를 사용한 데이터 처리방식을 제안하고 이에 따른 광학 및 신호처리 시스템을 구성하였다. 에너지 분포함수의 최대치와 최소치를 이용하여 같은 분무기로 분무된 증류수, 알코올, 실리콘 오일, 글리세린 등의 분포를 측정했는데 최대치와 최소치에 의해 구한 입자의 크기가 서로 잘 일치하였다.

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PDPA를 이용한 기체주입미립화기의 미립화 특성에 관한 연구 (A Study on the Atomization Characteristics of Effervescent Atomizer with PDPA)

  • 김형곤;시야이명;송규근;정병국;정재연;조태영
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2004년도 춘계학술대회
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    • pp.1316-1321
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    • 2004
  • An experimental study is performed on atomization characteristics and stable operating condition for injection of high viscous waste vegetable oil using effervescent atomizer with two aerator tubes. Consideration is given to the effects of ALR and liquid viscosity on the velocity and mean diameter of the injected droplet. It is found that (i) as ALR increases, the axial velocity of the droplet is increased, while half-velocity width and SMD are decreased regardless of the change in liquid viscosities, (ii) the rate of fine drop distribution occupied in the total spray field is increased with an increasing in ALR, and (iii) the effect of viscosity on atomization characteristics is minor.

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Microprocessor Based Laser Induced Fluorometry I. Development of System and Application to Liquid Chromatography

  • Kim, Ha-Suck;Park, Chan-Seung;Hwang, Eui-Jin;Chol, Q.-Won
    • Bulletin of the Korean Chemical Society
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    • 제5권6호
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    • pp.253-259
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    • 1984
  • An analytical applicability of the fluorescence detection with an optical multichannel analyzer to organic dyes was studied in this work. Continuous acquisition of spectra was possible with the use of a microcomputer. The maximum acquisition rate of a spetrum with 70-point average was about 3 seconds. Floppy discs were used to store data for later use in processing. Laser induced fluorescence detector in High Performance Liquid Chromatography was chosen for an application. Fluorescein below $10^{-15}g$ was detected satisfactorily using this system. With the help of microcomputer, three dimensional chromatograms of time-wavelength-intensity were obtained.

Study and Application of the New Stick Make Up Product Using Clay Minerals as Binder & Buffer.

  • Kim, Sang-Je;Shin, Dong-Uk;Cho, Pan-Gu;Jung, Chul-Hee
    • 대한화장품학회지
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    • 제25권4호
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    • pp.97-110
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    • 1999
  • The new stick make-up product was studied by using a gel, which is a viscous complex formed with clay minerals, vitamins A and E and fluorinated liquid polymer with a 1500 molecular weight. The gel cannot be obtained with any random combination of clay minerals and the ingredients described above. It takes the sequential manufacturing method as follows to get this kind of gel. Firstly, clay minerals and liquid polymers have to be pre-mixed in order to saturate the liquid polymers with the clay minerals. Then the on-processed gel has to be finely crystallized. The clay minerals, which are the core elements for this gel, were used as a function of Binder & Buffer and liquid polymer was mixed together for the deterioration of the surface tension of each component and to form a functional film in the gel. This liquid polymer was combined with clay minerals because it is not miscible with most oils and solvents. Waxes have a function of keeping a solid status in the stick. We reduced the usage of waxes by putting clay minerals as buffer in the proportion of 0.5:1 with oil phase. Ceramide takes care of the skin when used regularly and maintains the skin's moisture. Vitamins A and E contribute to preventing skin aging by the activation of skin cells. We could get the stable viscous gel, which has about 80% oil phase using clay minerals and liquid polymer. The crystalline structures of gel were surface-chemically-analyzed using SEM and Image Analyzer and were thermodynamically analyzed using DSC. Surface tension test and softness were done by Rheometer. In the end, these characteristics were verified by consumer panel tests in Seoul, Daegeon and Pusan in Korea and Hokkaido, Osaka and Miyazaki in Japan with correlation to the climate.

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Study and Application of the New Stick Make Up Product Using Clay Minerals as Binder & Buffer.

  • Kim, Sang-Je;Shin, Dong-Uk;Cho, Pan-Gu;Jung, Chul-Hee
    • 대한화장품학회:학술대회논문집
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    • 대한화장품학회 1999년도 IFSCC . ASCS 학술대회 발표 논문
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    • pp.97-110
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    • 1999
  • The new stick make-up product was studied by using a gel, which is a viscous complex formed with clay minerals, vitamins A and I and fluorinated liquid polymer with a 1500 molecular weight. The gel cannot be obtained with any random combination of clay minerals and the ingredients described above. It takes the sequential manufacturing method as follows to get this kind of gel. Firstly, clay minerals and liquid polymers have ·to be pre-mixed in order to saturate the liquid polymers with the clay minerals. Then tile on-processed gel has to be finely crystallized. The clay minerals, which are the core elements for this gel, were used as a function of Binder & Buffer and liquid polymer was mixed together for the deterioration of the surface tension of each component and to from a functional film in the gel. This liquid polymer was combined with clay minerals because it is not miscible with most oils and solvents. Waxes have a function of keeping a solid status in the stick. We reduced the usage of waxes by putting clay minerals as buffer in the proportion of 0.5 : 1 with oil phase. Ceramide takes care of the skin when used regularly and maintains the skin’s moisture. Vitamins A and I contribute to preventing skin’aging by the activation of skin cells. We could get the stable viscous gel, which has about 80% oil phase using clay minerals and liquid polymer, The crystal 1 me structures of gel were surface-chemical1y-analyzed using SEM and Image Analyzer and were thermodynamically analyzed using DSC, Surface tension test and softness were done by Rheometer. In the end, these characteristics were verified by consumer panel tests in Seoul, Baegeon and Pusan in Korea and Hokkaido, Oska and Miyazaki in Japan with correlation to the climate.

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Extinguishment of Liquid Fuel Fire by Water Mist Containing Additives

  • Park, Jae-Man;Won, Jung-Il;Shin, Chang-Sub
    • International Journal of Safety
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    • 제4권2호
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    • pp.24-29
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    • 2005
  • An experimental study was presented for extinguishing characteristics of liquid fuel fire by water mist($Dv_{0.99}{\leq}200{\mu}m$) containing potassium acetate and sodium acetate trihydrate. To evaluate the extinguishing performance of water mist containing additives, the evaporation characteristics of a water droplet on a heated surface was examined. The evaporation process was recorded by a charge-coupled-device camera. Also, small-scale extinguishing tests were conducted for n-heptane pool fire in ventilated space. During the experiments, flame temperatures were measured, and concentrations of oxygen and carbon monoxide were analyzed by a combustion gas analyzer. The average evaporation rate of water droplet containing additives was lower than that of pure water at a given surface temperature and decreased with the concentration increase due to the precipitation of salt in the liquid-film and change of surface tension. In case of using additives, the fire extinguishing times was shorter than that of pure water at a given discharge pressure and it was because the momentum of a water droplet containing additives was increased. And also dissociated metal atoms, potassium or sodium, were reacted as a scavenger of the major radical species OH, H which were generated for combustion process. Moreover, at a high pressure of 4 MPa, the fire was extinguished through blowing effect as well as primary extinguishing mechanisms.

유기화 점토를 이용한 열방성 액정 폴리에스테르 나노복합재료의 합성과 특성 연구 (Synthesis and Characterization of Organo-Clay Based Thermotropic Liquid Crystalline Polyester Nanocomposites)

  • 서보수;장진해
    • 폴리머
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    • 제25권6호
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    • pp.876-883
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    • 2001
  • 에톡시히드로퀴논과 브로모 테레프탈산을 사용하여 용액 중합법으로 네마틱 액정 상을 가지는 열방성 액정 고분자를 합성하였다. 합성된 헥사데실-몬모릴로나이트 (C$_{16}$-MMT)를 액정고분자의 용융 전이온도 이상에서 매트릭스 고분자에 대해 여러 wt%로 조성을 변화시키면서 나노복합재료를 만들었다. $C_{16}$-MMT가 액정 고분자에 대해 2 wt%만 첨가되어도 열적 성질이 크게 증가하였으며 이후로 $C_{16}$-MMT가 증가함에 따라 일정하게 증가하였다. 유기화 점토가 2에서 6 wt%까지 증가되어도 액정 상은 파괴되지 않고 그대로 유지되었다. X-ray 회절도의 결과, 첨가된 $C_{16}$-MMT의 일부는 TLCP에 잘 분산되었으나, 일부는 뭉쳐진 형태로 존재하였으며 첨가된 $C_{16}$-MMT의 상이 증가할수록 뭉침이 증가되었다. 합성된 나노복합재료의 열적 성질과 몰폴로지는 시차주사 열분석기(DSC), 열중량 분석기(TGA), 편광 현미경, 그리고 전자 현미경(SEM, TEM) 등을 이용하여 분석하였다.다.

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다기통 전기점화기관의 혼합기 불균일화가 사이클 변동에 미치는 영향 (I) (Effect of Non-Uniform Mixture on Cycle Fluctuation of Multi-Cylinder Spark Ignition Engine(I))

  • 송재학;이용길;박경석;양옥룡
    • 대한기계학회논문집
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    • 제16권9호
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    • pp.1736-1743
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    • 1992
  • 본 연구에서는 기화기부착 4행정 4기통 전기점화기관을 사용하여 흡기관내 액 막흐름에 의한 연료의 불균일화가 기관의 연소특성과 배기특성에 미치는 영향을 규명 하는데 궁극적인 목적을 두고 우선, 연소특성을 해석하기 위하여 비교적 고가인 연소 해석 시스템을 개발하는데 1차적인 목적으로 하였으며, 시험제작한 연소해석 시스템으 로 액막흐름의 가시화 및 배기가스 농도측정과 지압선도 해석을 행하여 구조적으로 대 칭인 1번과 4번 실린더의 연소특성과 배기특성을 비교 검토하였다.

액체질소중 정극성 직류방전시 방사전자파의 주파수 스펙트럼 특성 (The Frequency Spectrum Characteristics of the Radiated Electromagnetic Waves during Positive DC Discharge in Liquid Nitrogen)

  • 박광서;신호영;최병주;최상태;김기채;이광식;이동인
    • 대한전기학회논문지:전기물성ㆍ응용부문C
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    • 제48권9호
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    • pp.648-655
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    • 1999
  • In this study, a relationship between DC discharge and the radiated electromagnetic waves is investigated by measuring electromagnetic waves using a biconical antenna and a spectrum analyzer. The characteristics of frequency spectrum ofthe radiated electromagnetic waves was measured at the atmospheric pressure in Liquid Nitrogen $(LN_2)$ during partial discharges in nonuniform and uniform electric field depend on positive DC power. From this experiment results, it was confirmed that when partial discharge was produced in Liquid Nitrogen and Air, the signal of partial discharge was detected by this experiment and the analysis method. It is considered thatthese results obtained from this investigation may be used as fundamental data for diagnosis and prediction of insulation on the equipments ultra-high voltage, superconducting and cryogenic applications.

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