• Title/Summary/Keyword: 입자(particulate)

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Performance Characteristics of a Hybrid Particulate Collector (하이브리드 집진장치의 성능 특성)

  • 최호경;이시훈;김상도;박영옥
    • Proceedings of the Korea Air Pollution Research Association Conference
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    • 2003.11a
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    • pp.493-494
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    • 2003
  • 본 연구에서는 전기집진 기술과 여과집진 기술의 조합에 의한 먼지입자의 포집성능 상승효과를 최대한 높일 수 있는 먼지부하 저감형 하이브리드 집진장치(Hi-Filter)를 개발하기 위한 연구의 일환으로 파일럿 규모의 실험장치에서 운전 조건을 변화시키면서 장시간 실험을 통해 집진성능 특성 변화를 고찰한다. (중략)

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Preparation and Characterization of Rosiglitazone-loaded PLGA Nanoparticles (Rosiglitazone약물을 함유한 PLGA 나노입자 제조 및 분석)

  • Shin, Ko-Eun;Huh, Kang-Moo;Lee, Yong-Kyu
    • KSBB Journal
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    • v.23 no.5
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    • pp.408-412
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    • 2008
  • The rosiglitazone loaded poly (lactide-co-glycolide) (PLGA) nanoparticles (NPs) were prepared by the emulsion-evaporation method and optimized for particle size and entrapment efficiency. The optimized particles were 140-180 nm in size with narrow size distribution and 80% entrapment efficiency at 1% w/w initial drug loading when prepared with 1-3% w/v of PVA as a surfactant. These particulate carriers exhibited controlled in vitro release of rosiglitazone for 36 hrs at a nearly constant rate after 4 hrs release. In conclusion, these results indicate that PLGA NPs have greater potential for oral delivery of rosiglitazone.

A Study on the Measurement of the Dimensionless Light Extinction Constant for Particulate Matter from Fuel Oil for Marine and Land Diesel Engines (선박 및 육상 디젤 엔진용 연료유에서 발생하는 입자상물질에 대한 무차원 광소멸계수 계측에 관한 연구)

  • Rho, Beom-Seok;Choi, Jae-Hyuk;Cho, Kwon-Hae;Park, Seul-Hyun;Lee, Won-Ju
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.24 no.2
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    • pp.275-281
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    • 2018
  • It is known that he pollutant emitted from the combustion process of marine fuel oil causes air pollution and harmful effects to the human body. Accordingly, IMO regulates pollutants emitted from ships. However, the regulation of Particulate Matter (PM) is still in the process of debate, so preemptive action is needed. Fundamental research on PM is essential. In this study, the Dimensionless Light Extinction Constant ($K_e$) of fuel oil used in marine diesel engines was measured and analyzed to construct the basic data of the PM generated from marine-based fuel oil. The fuel oil used in the land diesel engine was measured in the same way for character comparison. Both fuel oils differ in sulfur content and density. The $K_e$ was measured via the optical method using a 633 nm laser and was determined by using the volume fraction of PM collected by the gravimetric filter method. The $K_e$ of the PM discharged from marine fuel oil is 8.28, and the land fuel oil is 8.44. The $K_e$ of two fuel oils was similar within the measurement uncertainty range. However, it was found by comparison with the value obtained by the Rayleigh-Limit solution that the light scattering portion could be large. Also, it was found that light extinction characteristics could be different due to the relationship between light transmittance and collected mass.