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질소로 희석된 프로판 동축류 층류 제트 부상화염에서 열손실에 의한 자기진동에 대한 동축류 속도 효과
이원준(Won June Lee),윤성환(Sung Hwan Yoon),박정(Jeong Park),권오붕(Oh Boong Kwon),박종호(Jong ho Park),김태형(Tae hyung Kim) 한국연소학회 2012 한국연소학회지 Vol.17 No.1
Laminar lifted propane coflow-jet flames diluted with nitrogen were experimentally investigated to determine heat-loss-related self-excitation regimes in the flame stability map and elucidate the individual flame characteristics. There exists a critical lift-off height over which flame-stabilizing effect becomes minor, thereby causing a normal heat-loss-induced self-excitation with O(0.01 Hz). Air-coflowing can suppress the normal heat-loss-induced self-excitation through increase of a Peclet number; meanwhile it can enhance the normal heat-loss-induced self-excitation through reducing fuel concentration gradient and thereby decreasing the reaction rate of trailing diffusion flame. Below the critical lift-off height. the effect of flame stabilization is superior, leading to a coflow-modulated heat-loss-induced self-excitation with O(0.001 Hz). Over the critical lift-off height, the effect of reducing fuel concentration gradient is pronounced, so that the normal heat-loss-induced self-excitation is restored. A newly found prompt self-excitation, observed prior to a heat-loss-induced flame blowout, is discussed. Heat-loss-related self-excitations, obtained laminar lifted propane coflow-jet flames diluted with nitrogen, were characterized by the functional dependency of Strouhal number on related parameters. The critical lift-off height was also reasonably characterized by Peclet number and fuel mole fraction.
이상형,이준상,전항배,박종호 ( Sang Hyung Lee,Jun Sang Lee,Hang Bae Jun,Jong Ho Park ) 한국물환경학회 1997 한국물환경학회지 Vol.13 No.4
In this research, an wasted washing machine was remanufactured to a sequencing batch reactor(SBR) and investigated for treating swine wastewater with it. This SBR system was operated for removing COD, ammonia, and suspended solid, that were the major pollutants in animal wastewater. Aerobic and anoxic conditions after FILL were applied intermittently for effective removal of nitrogen. SETTLE and DRAW modes were followed by the complete aerobic and anoxic REACT. The total volume of the SBR was 75 liters, while the working volume in a cycle was 35 liters. When the final operating strategy of the SBR was FILL/REACT/SETTLE/DRAW of 0.5/10/1/0.5 hr, the removal efficiencies of TCOD_(Cr), NH₄-N, and T-N were 95, 98, and 85%, respectively. Finally, this SBR system can handle 10(based on 70㎏) pigs effectively.
국내 비산배출 저감대상 업종의 특정대기유해물질 배출 특성
채정석(Jeong-Seok Chae),이수민(Su-min Lee),전준민(Jun-Min Jeon),홍지형(Ji-Hyung Hong),이창훈(Chang Hoon Lee),함성원(Sung-Won Ham),박종호(Jongho Park),서경애(Kyoung-Ae Seo),강대일(Dae-Il Kang),장기원(Kee-Won Jang) 한국대기환경학회 2024 한국대기환경학회지 Vol.40 No.2
Plants were selected for industries subject to hazardous air pollutants (HAPs) fugitive emissions reduction, and the concentrations of 33 types of specific air pollutants were measured at stacks equipped with prevention facilities. The dominant HAPs emitted from the plant were identified, and air emissions were calculated based on the measurement information. In addition, carcinogenic and non-carcinogenic toxicity information was applied as weight to air emissions to identify important substances subject to management. These results were compared with air emissions information of pollutant release and transfer registers (PRTR). 30 types of specific air pollutants were detected in 77 stacks at a total of 35 plants. It was confirmed that only information on 25 types of specific air pollutants is provided for air emissions from PRTR in the same industry. In particular, in this study, information on the emissions of hydrogen cyanide and propylene oxide, which have the highest concentration and the largest amount of air emissions, are not included in the PRTR of the relevant industry, so there may be omissions regarding HAPs in terms of air emissions data. It was confirmed that there was a change in priority when the emission ranking calculated in this study reflected toxicity information. Potential carcinogenic substances are hydrazine, ethylene oxide, Be, Cd, acrylonitrile, and Ni, and non-carcinogenic substances are benzo[a]pyrene, Cd, hydrogen cyanide, and Be, Ni, hydrazine, and Pb were evaluated as important emissions in that order. It is believed that if more measurement data is supplemented in the future, it will be possible to more rationally select priority management target substances at plants emitting HAPs.
담배가루이(Bemisia tabaci) 병원성곰팡이 Lecanicijjium lecanii Btab0l 균주의 특성
윤여준,유용만,이민호,한은정,홍성준,안난희,김용기,지형진,박종호,Yoon, Yeo-Jun,Yu, Yong-Man,Lee, Min-Ho,Han, Eun-Jung,Hong, Sung-Jun,Ahn, Nan-Hee,Kim, Yong-Ki,Jee, Hyung-Jin,Park, Jong-Ho 한국응용곤충학회 2010 한국응용곤충학회지 Vol.49 No.4
국내에 문제가 되는 담배가루이(Bemisia tabaci)의 살충성 Lecanicillium lecanii Btab01 균주의 생육 특성과 살충력을 검정하였다. PDA, TSA, SDA+Y배지에서 L. lecanii Btab01은 $20{\sim}25^{\circ}C$에서 균사성장이 가장 빨랐으며 $28^{\circ}C$이상에서 성장이 억제되었다. L. lecanii Btab01는 고체배양과 액체배양 시 담배가루이 약충에 대해 살충률에 큰 차이를 보이지는 않았다(93.9%, 98.3%). 농도별로는 $10^5$, $10^6$, $10^7$, $10^8$ cfu/ml에서 각각 5.8%, 33.8%, 77.3%, 98.5%의 살충률을 보였고 각각 16.1일, 7.3일, 5.1일, 3.5일의 $LT_{50}$값을 나타내었다. L. lecanii Btab01을 약충에 처리 후 포화습도 조건을 0 시간 24 시간, 168 시간 유지하였을 때, 0%, 20.3%, 100%의 살충률을 보였다. 균주에 0.5% 식용유를 첨가하였을 때 포자의 발아가 2 배 가량 증가하였으며 균주에 0.1% 식용유를 첨가하여 약충에 처리했을 때(98.6%)가 첨가하지 않았을 때(79.9%)보다 살충력이 향상됨을 알 수 있었다. Cultural characteristics Lecanicillium lecani Btab01 and its insecticidal activity against tobacco whitefly (Bemisia tabaci) were investigated. On potato dextrose agar, tryptic soy agar and SDA+Y media, mycelial growth of L. lecani Btab01 was best at $20{\sim}25^{\circ}C$ and suppressed above $28^{\circ}C$. Both solid culture and liquid culture of L. lecani Btab01 showed high insecticidal activity, 93.9 and 98.3% respectively, against nymph of tobacco whitefly, but there is no significant difference. When culture of L. lecani Btab01 was treated at the concentration of $10^5$, $10^6$, $10^7$ and $10^8$ cfu/ml, their insecticidal activity were 5.8%, 33.8%, 77.3% and 98.5% respectively, and $LT_{50}$ values were 16.1 days, 7.3 days, 5.1 days and 3.5 days respectively. When nymphs were treated by the cultures of L. lecani Btab01 and maintained under saturated condition for zero hour, 24 hours and 168 hours, their control activities were 0%, 20.3% and 100% respectively. Spore germination of L. lecani Btab01 was increased about two times by adding edible oil. When L. lecani Btab01 was treated to control nymph with 0.1% edible oil, it showed high control activity(98.6%) compared to single treatment of L. lecani Btab01 (79.9%).