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이민도(Mim-Do Lee),김소영(So-Young Kim),임용재(Yong-Jae Lim),서석준(Seok-Jun Seo),김영환(Young-Hwan Kim),조기철(Ki-Chul Cho) 한국환경관리학회 2010 環境管理學會誌 Vol.16 No.1
본 연구는 다환방향족탄화수소류에 대하여 매체간 거동 및 물리ㆍ화학적 변환 등을 파악하여 대기, 수질, 토양에 대한 평가방법을 구축하고 기초자료를 확보하고자 하였다. 미국 EPA가 개발한 구획모형인 CalTOX 모델을 사용하여 주요 다환방향족탄화수소류의 다매체 거동 및 매체별 분포 특성을 예비모사하였다. 그 결과 run-off 지점의 PAHs 농도 분포 결과, 4개 지점의 총 PAHs 농도는 표토에서 2.34 ~ 49.09 ㎍/㎏, 심토에서 5.96~42.67 ㎍/㎏으로 다양한 농도 범위를 보여주었으며, run-off 지점의 특성을 고려하여 대기 중 PAHs 결과와 함께 수질 및 퇴적토와의 연관성을 고려하여 평가되어야 할 것으로 판단된다. 아산호와 삽교호 인근지역의 8개 매체(대기, 나뭇잎, 표토, 뿌리지역 토양, vadose-zone 토양, 지하수, 지표수, 퇴적물)에 대한 CalTOX 모사결과, 매체별 분포율은 뿌리지역 토양으로 축적되는 것은 40.4~91.0%로 나타났고, 표토층에 축적되는 것은 2.2~5.5%로 나타났다. CalTOX에 의한 일별 매체간 이동량을 모사한 결과, PAHs는 주로 대상지역에 존재하는 석유정제시설로부터 대기로 유입되어 대기중 이류에 의한 모사구간 외부 유출, 매체 내에서 반응기작 및 반감기에 따른 소멸, 뿌리부근토양으로의 침적 등으로 거동되는 것으로 나타났다. This study was carried out to establish the diagnostic method of multi-media fate of pollutants and to monitor the pollutant distribution as a basic study for assessment of environmental toxicity of pollutants. CalTOX model, which is developed to study the multi-media transportation, inter-media production, and sink mechanism of chemicals by U.S. EPA, was used to predict the multimedia characteristics of PAHs in Lake Asan and Lake Sapgyo region. The mean concentration of total PAHs, calculated by summing up gaseous and particulate PAHs in the atmosphere, is Phenanthrene (3.87 ng/㎥) > Fluoranthene (1.48 ng/㎥) > Indeno(1,2,3-cd)pyrene (1.45 ng/㎥) > Benzo(a)pyrene (0.23 ng/㎥) > Benzo(a)antracene (0.15 ng/㎥), in order of concentration. Dry deposition flux, serving as an index for PAHs in the atmosphere, were Phenanthrene(1.48㎍/㎡/day) > Indeno(1,2,3-cd)pyrene(0.31 ㎍/㎡/day)> Fluoranthene(0.28 ㎍/㎡/day) > Benzo(a)pyrene (0.25 ㎍/㎡/day) > Benzo(a)anthracene(0.23 ㎍/㎡/day) in order of high flux. The order of five PAHs compounds in water was Fluoranthene> Phenanthrene> Benzo(a)pyrene> Benzo(a)anthracene, Indeno(1,2,3-cd)pyrene. Concentrations are ranged from <1.0 ng/L to 11.0 ng/L for Phenanthrene, <1.0 ng/L to 13.2 ng/L for Fluoranthene, <0.5 ng/L to 1.0 ㎍/L for Benzo(a)anthracene and <1.0 ng/L to 1.9 ng/L for Benzo(a)pyrene, <0.5 ng/L to 0.8 ng/L for Indeno(1,2,3-cd)pyrene. The ranges of average concentration of PAHs in forest soil, upland soil, and road soil with land use were as followed by soil depth: ND~92.90 ㎍/㎏ for Phenanthrene, 2.15~97.86 ㎍/㎏ for Fluororanthene, ND~32.01 ㎍/㎏ for Benzo(a)anthracene, ND~10.69 ㎍/㎏ for Benzo(a)pyrene, and ND~22.74 ㎍/㎏ for Indeno(1,2,3-cd)pyrene. PAHs concentrations in surface soil were mainly higher than those in subsurface soils. CalTOX model, As a result, accumulations of PAHs into the root-zone soil were about 40.4~91.0%, with 2.2~5.5% of PAHs accumulated on the ground soil. CalTOX simulation showed that the flux of PAHs transported between media flowed mainly in the atmosphere, 7.7~38.9% of which flowed out, 57.4~87.2% of which disappeared, and 0.7~4.3% of which were deposited into the root-zone soil.
( Nuhu Alam ),( Ki Nam Yoon ),( Kyung Rim Lee ),( Pyung Gyun Shin ),( Jong Chun Cheong ),( Young Bok Yoo ),( Mi Ja Shim ),( Mim Woong Lee ),( U Youn Lee ),( Tae Soo Lee ) 한국균학회 2010 Mycobiology Vol.38 No.4
We evaluated the antioxidant activity and tyrosinase inhibitory effects of Pleurotus ostreatus fruiting bodies extracted with acetone, methanol, and hot water. The antioxidant activities were tested against β-carotene-linoleic acid, reducing power, 1,1-diphenyl-2-picrylhydrazyl free radical scavenging activity, and ferrous chelating ability. Furthermore, phenolic acid and flavonoid contents were also analyzed. The methanol extract showed the strongest β-carotene-linoleic acid inhibition as compared to the other exracts. The acetone extract (8 mg/mL) showed a significantly high reducing power of 1.54 than the other extracts. The acetone extract was more effective than other extracts for scavenging on 1,1-diphenyl-2-picrylhydrazyl radicals. The strongest chelating effect (85.66%) was obtained from the acetone extract at 1.0 mg/mL. The antioxidant activities of the extracts from the P. ostreatus fruiting bodies increased with increasing concentration. A high performance liquid chromatography analysis detected seven phenolic compounds, including gallic acid, protocatechuic acid, chlorogenic acid, naringenin, hesperetin, formononetin, and biochanin-A in an acetonitrile and 0.1 N hydrochloric acid (5:1) solvent extract. The total phenolic compound concentration was 188 μg/g. Tyrosinase inhibition of the acetone, methanol, and hot water P. ostreatus extracts increased with increasing concentration. The results revealed that the methanol extract had good tyrosinase inhibitory ability, whereas the acetone and hot water extracts showed moderate activity at the concentrations tested. The results suggested that P. ostreatus may have potential as a natural antioxidant.
열처리 온도에 따른 T102 나노튜브의 리튬이차전지 음전극 특성
최민규 ( Mim Gyu Choi ),강근영 ( Kun Young Kang ),이영기 ( Young Gi Lee ),김광만 ( Kwang Man Kim ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.1
루타일(rutile) TiO2 분말의 알칼리 수열합성과 300~500 ℃ 열처리를 통해 TiO2 나노튜브를 제조하고, 이를 리튬이 차전지의 음극 활물질로 채택하여 그 물성과 전기화학적 특성을 조사하였다. 수열반응 직후의 정제과정에서 불순물인 미세분진을 완전히 제거하여 제조된 TiO2 나노튜브는 고비표면적과 확연한 나노튜브 결정상을 보였다. 또한 열처리 온도가 증가함에 따라 등방적으로 분산된 나노튜브들이 서로 응집되어 비표면적의 감소를 초래하였다. 300 ℃ 열처리한 TiO2 나노튜브가 250 mAh g-1의 가장 높은 초기 방전용량을 나타내었으며, 사이클과 고율 특성은 400 ℃ 열처리한 시료가 가장 우수한 성능을 보였다.
Kang, Hyun Ju,Lee, Kum Hee,Kim, Heo Mim,Seo, Ji Hyun,Kim, Young Kwan,Yoon, Seung Soo American Scientific Publishers 2012 Journal of Nanoscience and Nanotechnology Vol.12 No.5
<P>We have designed and synthesized four orange red phosphorescent Ir-III complexes based on the benzoylphenylpyridine ligand with fluorine and trifluoromethyl substitution. Multi layered OLEDs were fabricated using these complexes as dopant materials. Particularly, by using 1 as a dopant in the emitting layer, a highly efficient orange red OLED was fabricated, showing a maximum luminance of 10410 cd/m(2) at 10 V, a luminous efficiency of 17.47 cd/A, a power efficiency of 7.19 lm/W, an external quantum efficiency of 6.27% at 20 mA/cm(2), respectively, and CIEx,y coordinates of (0.51, 0.48) at 10 V. Furthermore, a red OLED using dopant 2, with CIEx,y coordinates of (0.61, 0.39), exhibited a maximum luminance of 5797 cd/m(2) at 10 V, a luminous efficiency of 11.43 cd/A at, a power efficiency of 4.12 lm/W, and an external quantum efficiency of 6.62% at 20 mA/cm(2), respectively.</P>