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CO2와 수온 증가에 대한 봄철 저수온기 팔당호 식물플랑크톤군집 변화
이가람 ( Ka Ram Lee ),성은주 ( Eun Ju Sung ),박혜진 ( Hye Jin Park ),박채홍 ( Chae Hong Park ),박명환 ( Myung Hwan Park ),황순진 ( Soon Jin Hwang ) 한국수생태학회 2013 생태와 환경 Vol.46 No.4
This study investigated the influence of temperature and CO2 increase on phytoplankton growth and community structure during cold water season (spring) in Lake Paldang, Korea. Four experimental treatments of temperature and CO2 manipulation were prepared in the laboratory batch culture: (1) Control; ambient low temperature (6±2.C) and low CO2 (air level, 400 mg L-1), (2) T1; low temperature and high CO2 (800 mg L-1), (3) T2; high temperature (20±2.C) and low CO2, (4) T3; high temperature and high CO2. Algal growth experiment was carried out for 10 days under the light intensity of 70 μmol m-2 s-1 (L:D=24 : 0). The level of pH decreased in both T1 and T3, due to dissolution of added CO2. The dominant phytoplankton species of ambient water, Cyclotella meneghiniana succeeded to Fragilaria capucina var. gracilis in high-temperature treatment groups (T2 and T3). Cyanobacteria were very rare at the beginning of the experiment, while Oscillatoria limnetica appeared in only high-temperature groups (T2 and T3) at 6~7th day. CO2 addition in ambient temperature (T1) induced the highest phytoplankton growth, and thereby producing the highest average cell density of 3.27±0.33 104 cells mL-1, followed by T2 (2.65±0.26 104 cells mL-1), T3 (2.09±0.16 104 cells mL-1), and Control (1.86±0.13 104 cells mL-1) (F=7.167, p=0.000). In summary, temperature increase changed the phytoplankton community structure and CO2 increase promoted the phytoplankton growth during the cold spring season in Lake Paldang, suggesting a potential effect of climate change on freshwater phytoplankton.
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압출 가공 wick-free plate가 적용된 다중효용확산 태양열 증류기의 성능 실험
이가람(Lee Ga-Ram),임병주(Lim Byung-Ju),최석민(Choi Seok-Min),박창대(Park Chang-Dae) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.1
We have developed a wick-free plate (WFP) in which a groove pattern is applied to the surface of a plate to replace the wick-plate, which is a key component of a multi-effect diffusion distiller (MEDD). Wicks and plates act as an evaporation surface and a condensation surface, respectively, in MEDD. However, the wick-plate structure has several problems, such as laborious manufacturing processes and lower durability. Therefore, in this study, WFPs were manufactured using the extrusion method, and MEDD with WFPs was experimentally evaluated. The extrusion method had a lower processing cost and better corrosion-resistance surface than the etching process that was employed in our previous study. The extruded WFP could lower the manufacturing cost by 77% compared to the etched WFP, and had the advantage of absorbing more solar radiation energy by lowering the installation inclination angle by 10°. After fabricating the triple-effect MEDD with the extruded WFPs, an indoor performance experiment was conducted. The results of the solar thermal performance test indicated that WFP-MEDD at 11.7 MJ/(㎡·d) of thermal energy produced 3% higher freshwater than the existing MEDD with a wick-plate.
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