• Title, Summary, Keyword: 에탄

Search Result 358, Processing Time 0.043 seconds

Ethane Evolution in Cucumber Plants by Air Pollutants in Relation to Plants Injury (대기오염 물질 처리에 의한 오이 장해와 에탄 생성)

  • Bae, Gong-Young
    • Korean Journal of Environmental Agriculture
    • /
    • v.17 no.2
    • /
    • pp.127-131
    • /
    • 1998
  • Ethane was measured to know whether active oxyzens may induce phytoxicity in stressedcucumber plant.The time course of the increase in ethane evolution was the same as that of the increase of visible injury in all treatments except $SO_2$ treatment.This result showed that air pollutants-induced plant damages were closely related to ethane evolution.And evolution of ethane was more increased in combined stress than singly one,suggesting that phytotoxicity was more severe in complex sterss.Also, evolution of ethane was enhanced in the light condition and scavengers of active oxygen were inhibited,showing that plant damage that plant damage were cause by active oxygens.

  • PDF

Phase Equilibria of Ethane and Propane Hydrates in Porous Media (다공성 매질에서 에탄 및 프로판의 가스 하이드레이트 상평형)

  • Lee, Seung-Min;Cha, In-Uk;Lee, Ju-Dong;Seo, Yong-Won
    • 한국신재생에너지학회:학술대회논문집
    • /
    • /
    • pp.182-185
    • /
    • 2008
  • 최근 새로운 천연가스 수송/저장법으로 가스 하이드레이트 형성법이 주목받고 있다.본 연구에서는 천연가스의 저장 매체로 다공성 매질인 실리카 젤을 사용하였다. 다공성 실리카 젤을 사용할 경우 물과 기체의 접촉면적을 극대화 시킬 수 있어 가스하이드레이로의 전환율을 높일 수 있다. 본 연구에서는 천연가스 주성분인 에탄과 프로판 기체를 사용하였으며, 기공의 직경이 각각 6.0 nm, 15.0 nm, 30.0 nm, 100.0 nm의 다공성 실리카 젤을 사용하였다. 에탄은 270 $\sim$ 285 K의 온도범위와 9 $\sim$ 25 bar의 압력범위, 프로판은 260 $\sim$ 280 K의 온도범위와 1.8 $\sim$ 2.8 bar의 압력범위에서 기공 크기의 분포를 고려하여 하이드레이트(H)-물($L_W$)-기상(V)의 3상 평형점을 측정하였다. 측정 결과 기공의 크기가 작아질수록 각각의 벌크 상태의 에탄 및 프로판 하이드레이트에 비해 하이드레이트의 평형조건이 온도는 낮아지고 압력이 높아지는 저해효과가 커짐을 알 수 있었다. 천연가스 수송/저장으로서 응용을 고려할 경우 저해효과가 적은 100.0 nm이상의 다공성 실리카 젤을 사용하는 것이 적절할 것으로 사료된다. 본 연구에서 얻어진 결과는 천연가스 수송/저장뿐만 아니라 심해저 천연가스 개발, 이산화탄소 심해저장 등의 가스 하이드레이트 용용 연구에도 유용한 기초 자료가 될 것이다.

  • PDF

Phase Equilibria of Ethane Hydrate in Porous Silica Gels (다공성 실리카 젤에서 에탄 하이드레이트의 상평형 측정)

  • Lee, Seung-Min;Cha, In-Uk;Lee, Ju-Dong;Seo, Yong-Won
    • 한국신재생에너지학회:학술대회논문집
    • /
    • /
    • pp.584-587
    • /
    • 2008
  • 최근 새로운 천연가스 수송/저장 방법으로 가스 하이드레이트 형성법이 주목받고 있다. 본 연구에서는 천연가스의 저장 매체로 다공성 실리카 젤을 사용하였다. 다공성 매질을 사용할 경우 물이 기체와 접촉하는 면적이 극대화되어 하이드레이트로의 전환율이 높아진다. 기공의 직경이 각각 6.0, 15.0, 30.0 nm의 실리카 젤을 사용하여 270 - 285 K의 온도 범위와 0.5 - 3.0 MPa의 압력 범위에서 기공 크기의 분포를 고려하여 에탄 하이드레이트의 3상 평형점 (하이드레이트 (H) - 물 (LW) - 기상 (V))을 측정하였다. 기공의 크기가 작아질수록 벌크 상태의 에탄 하이드레이트에 비해 하이드레이트 평형 조건이 온도는 낮아지고 압력이 높아지는 저해효과가 커짐을 알 수 있었다. 천연가스 수송/저장으로의 응용을 고려할 경우 저해효과가 적은 30.0 nm 이상의 실리카 젤을 사용하는 것이 유용할 것으로 사료된다. 본 연구의 결과는 심해저 천연가스 개발, 이산화탄소 심해저장 등의 가스 하이드레이트 응용 연구에도 유용한 기초자료가 될 것이다.

  • PDF

Study of Ethane Performance at Two-Stage Cascade Vapor Compression System (에탄을 사용한 2원 냉동 시스템의 성능 평가)

  • Rahadiyan, Lubi;Kim, Y.G.;Chung, H.S.;Jeong, H.M.
    • Journal of Power System Engineering
    • /
    • v.10 no.2
    • /
    • pp.75-82
    • /
    • 2006
  • 세계적인 환경 보호 정책에 따라 할로겐화탄소 냉매를 대체할 환경 친화적인 초저온 냉매의 개발과 연구가 활발히 진행되고 있다. 일반적으로 캐스캐이드 2원 냉동 시스템에서 아직까지 할로겐화탄소 냉매가 널리 사용되고 있다. 탄화수소 화합물의 한 종류인 에탄은 낮은 지구 온난화 지수와 낮은 오존층 파괴지수를 가진 친 환경적인 자연 냉매이다. 본 연구는 지구 온난화 지수가 높은 R-23 냉매와 비교하여 캐스캐이드 2원 냉동 시스템에서 에탄의 성능 시험을 목적으로 수행 하였다. 1원측에는 R-22를 사용하였으며, 증발 온도에 따른 성능은 R-23 보다 에탄(R-170)이 더 높게 나타났다.

  • PDF

Preparation and Reactions of Bis(trimethylsilylmethyl)-1,2-bis(disphenylphosphino)ethanenickel(II) (비스(트리메틸실릴메틸) 1,2-비스(디페닐포스피노)에탄니켈(II)의 합성 및 반응)

  • Chong Shik Chin;M. D. Curtis
    • Journal of the Korean Chemical Society
    • /
    • v.25 no.5
    • /
    • pp.311-317
    • /
    • 1981
  • A new nickel(II) compound, $Ni(CH_2SiMe_3)_2((C_6H_5)_2PCH_2CH_2P(C_6H_5)_2)$, 1, has been prepared by the reaction of $NiCl_2((C_6H_5)_2PCH_2CH_2P(C_6H_5)_2)$ with $Me_3SiCH_2Li$. The compound, 1, is stable under nitrogen at room temperature both in solution and in the solid state. Thermal decomposition of 1 in solution or in the solid produces the reductive coupling product, $Me_3SiCH_2CH_2SiMe_3$ which is also afforded by the reactions of 1 with CO and $O_2$ at room temperature, and with $(C_6H_5)_2PCH_2CH_2P(C_6H_5)_2$ at 80${\circ}$C.

  • PDF

Studies on Methanol Production from Methane by Methylosinus trichosporium (Methylosinus trichosporium을 이용한 메탄으로부터 메탄올 생성에 관한 연구)

  • 강환구
    • KSBB Journal
    • /
    • v.11 no.6
    • /
    • pp.642-648
    • /
    • 1996
  • The effects of EDTA(Ethylene diamine tetraacetic acid), Cu, temperature, and gas(methane and oxygen) composition on methanol production from methane with Methylosinus trichosporium were investigated. In this experiment EDTA was found to be a potential methanol dehydrogenase inhibitor since it causes methanol accumulation and 6mM was found to be optimum concentration of EDTA for methanol production. When Cu was added in culture media, the produced methanol concentration level was increased. Hence it is believed that Cu enhanced the particulate methane monooxygenase formation and consequently the addition of Cu could increase the methanol production from methane. In this experiment the optimum concentration of Cu was found to be 1mM for methanol production. When temperature was shifted down from $30^{\circ}C to 25^{\circ}C$, the methanol production level was enhanced by 50%. When the ratio of methane to oxygen in gas phase was increased to 2.3 from 1, produced methanol concentration was also enhanced by 100%.

  • PDF

Antimicrobial Effects of Ethanol-Extracted and Sub-Fractionated Materials from Different Parts of Quercus aliena Blume (갈참나무 부위별 에탄을 추출물 및 분획물의 항균효과)

  • Yoon, Jae-Won;Yoo, Mi-Young;Choi, Jae-Ho;Lee, Myoung-Ku;Oh, Deog-Hwan
    • Journal of the Korean Society of Food Science and Nutrition
    • /
    • v.34 no.6
    • /
    • pp.910-914
    • /
    • 2005
  • This study was to determine the inhibitory effect of ethanol extract of leaf, bark and xylem of Quercus aliena Blume and, consecutively, of organic solvent subfractions against food borne pathogens. The ethanol extracts of leaf, bark and xylem of Quercus aliena Blume were shown to have antimicrobial effect against Gram-positive and Gram-negative bacteria. Listeria monocytogenes and Salmonella Typhimurium were more resistant to ethanol extracts of the Quercus aliena Blume tissues compared with Bacillus cereus and Escherichia coli O157:H7. The ethanol extract of Quercus aliena Blume leaf showed the strongest antimicrobial activity against food borne pathogens, followed by those of xylem and bark. The ethanol extract treatment $(500\~1,000\mu g/mL)$ of Quercus aliena Blume leaf completely reduced the growth of B. cereus and L. monocytogenes within 24 hour whereas $2,000\mu g/mL$ of ethanol extract was needed for complete growth inhibition of E. coli O157:H7 and S. Typhimurium. Among organic solvent subfractions obtained from the ethanol extract of leaf, bark and xylem of Quercus aliena Blume, the ethyl acetate fraction showed the strongest antimicrobial activity, but no antimicrobial activity was observed in chloroform, hexane and water fractions.

Comparative Study on Continuous Ethanol Fermentation by Immobilized Tubular Fermentor (고정화된 효모로 충전된 관형발효기에서의 에탄올 연속발효)

  • 서근학;최명호;송승구
    • Microbiology and Biotechnology Letters
    • /
    • v.16 no.3
    • /
    • pp.205-212
    • /
    • 1988
  • The immobilized cell tubular tormentor was prepared by wood chips or alginate gel. Investigations of characterization of the performance of ethanol fermentation in the immobilized cell tubular tormentor were undertaken and the results were compared with those of other tormentors. The immobilized cell tormentor packed with alginate gel showed much higher ethanol productivity than that with wood chip. It was concluded that the immobilized cell tubular tormentor packed with alginate gel might offer better perspectives for continuous ethanol production than that with wood chip.

  • PDF

Monte Carlo Simulation on the Adsorption Properties of Ethane and Propane in Zeolite L (제올라이트 L 중 에탄과 프로판의 흡착성질에 대한 몬테칼로 시뮬레이션)

  • Moon, Sung Doo;Choi, Dai Ung;Kim, Yang
    • Journal of the Korean Chemical Society
    • /
    • v.42 no.1
    • /
    • pp.16-21
    • /
    • 1998
  • The adsorption of ethane and propane in $K^{+}$ ion exchanged zeolite L has been studied using grand canonical ensemble Monte Carlo simulation. $CH_3$ and $CH_2$ groups of sorbate molecule were considered as pseudoatoms in calculation of potential, and the bond lengths and bond angles within a molecule were fixed during simulation. Average number of molecules per unit cell, number density of molecules in zeolite, distribution of molecules per unit cell, average potential per sorbate molecule, and isosteric heats of adsorption were calculated, and these results were compared with experimental results. For ethane the simulation results agreed considerably well with experimental ones over a wide range of temperature. The average potential of sorbate molecule decreased slowly with the increase of amounts sorbed in zeolite.

  • PDF

Antioxidative and Antimicrobial Activities of Pomegranate Seed Extracts (석류씨 추출물의 항산화 및 항균활성)

  • Koh Jong-Ho;Hwang Myeong-O;Moon Joo-Soo;Hwang Seong-Yun;Son Jong-Youn
    • Korean journal of food and cookery science
    • /
    • v.21 no.2
    • /
    • pp.171-179
    • /
    • 2005
  • This study was investigated on antioxidative and antimicrobial activities of PSW(pomegranate seed water extract), PSE(pomegranate seed ethanol extract) and PSO(pomegranate seed oil). The extraction yields of PSW, PSE and PSO were 28.9, 13.0 and $4.9\%$, respectively. Total phenol contents of PSW, PSE and PSO were 47, 78 mg/g(dry basis) and 40 mg/g, respectively. Electron donating abilities of PSW, PSE and PSO at 1,000 ppm were 18.8, 28.5 and $9.7\%$, respectively. Antioxidative activities in Iinoleic acid substrates at 500 ppm were in order of PSE > $\alpha-tocopherol$ > PSW > PSO. Antioxidative activities in Iinoleic acid emulsion substrates at 200 ppm were in order of $\alpha-tocopherol$l > PSE > PSW > PSO. In antimicrobial activity, PSO showed growth inhibition effect against Micrococcus luteus, Salmonella enteritidis and PSW showed growth inhibition effect against Bacillus cereus, Escherichia coli. Whereas antimicrobial activity of PSE was not observed. The nitrite-scavenging abilities of PSW, PSE and PSO at 2,000 ppm were 27.5, 23.7 and $39.6\%$, respectively. And the SOD-like activities of PSW, PSE and PSO at 1,000 ppm were 15.9, 34.9 and $0.10\%$, respectively.