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小型 Solar Pond 內에 鹽度變化에 따른 溫度와 密度樣相에 관한 實驗的 硏究
朴伊東,徐志源 成均館大學校 科學技術硏究所 1986 論文集 Vol.37 No.2
A salt-gradient solar pond is a body of saline water which performsas a collector of solar energy and long-term thermal storage system. Salt-gradient solar ponds usually consist of three direct zones: an upper convective zone, a nonconvective gradient zone and a bottom convective zone. The increased density in non-convective-layer, as a result of salt concentration, counterbalance the decrease in density due to thermal expansion caused by solar heating and thus prevents convective circulation. For this purpose, experimental apparatus was made, and temperature, density brine in test pond were measured by pycnometer that was moving vertically. The testing situations and states for data taken were as follows: The test pond is of 0.5m wide, 0.5m high, 1.0m long, 7.1cm of suction height of diffuser above the tank bottom, 1.8cm of discharge height of diffuser above the tank bottom, 0.3 cm of slot size of sunction diffuser, 1.0 cm of slot size of discharge diffuser, 47 cm of diffuser slot length, heating method of circulation of hot water(75℃) through hot water tank, the extraction method of circulation storage brine into a heat exchanger external to the pond. In small test solar pond, confirmed the typical three zone which showed up in real solar pond. The results obtained are as follows: 1. When the salt concentration was constant and flow rate of extration hot brine increased, the density and temperature of storage zone tended to decrease and the temperature of upper convective layer tended to decrease respectively. But the density of upper convective layer tended to increase slowly. 2. The content of salt resulted in the salinity variation had a great influence on typical three zone, then the temperature and density of each layer changed directly. 3. They, that is density and temperature profile, stability governing parameter (Richardson number, Froude number) and visual observation, made use of confirming the height of interface, but the absolute value of it accorded with one another perfectly, tended to be closely according to the high salinity. In this experiment the interface stability level was identitied at a level 18.7 cm or so above the test tank bottom. 4. Optimal operating condition in the test pond as follows: 10% of salt concentration, 0.05 ㎥/h of flow rate of extraction hot brine.
Ji Yun Lee,Ji Hyun Kim,Ji Myung Choi,Hyemee Kim,Weon Taek Seo,Eun Ju Cho,Hyun Young Kim 한국응용생명화학회 2023 Journal of Applied Biological Chemistry (J. Appl. Vol.66 No.-
This study investigated the antioxidant and immune enhancement activities of Artemisia argyi H. fermented by Lactobacillus plantarum. The fermented A. argyi H. ethanol extract increased scavenging activities of 1,1-diphenyl-2- picrylhydrazyl (DPPH), 2,2'-azinobis-(3-ethylbenzothiazoline-6- sulfonic acid) (ABTS+), hydroxyl (·OH), and superoxide (O2 -) radicals. Particularly, the ethanol extract of fermented A. argyi H. exhibited higher ·OH and O2 radical scavenging activities, compared with DPPH and ABTS+ radical scavenging activities. To evaluate the immune enhancement effects of the fermented A. argyi H., mice were fed a normal diet supplemented the fermented A. argyi H. at concentrations of 1%, 2%, and 5%, respectively. The supplementation of fermented A. argyi H. dose-dependently increased splenocyte proliferation. In addition, mice fed with 5% fermented A. argyi H. showed enhanced proliferation of T-cells and B-cells, along with increased levels of interferon-γ, interleukin-10, and tumor necrosis factor-α, compared to the normal group. Furthermore, mice fed with fermented A. argyi H. exhibited an increase in prominent probiotics such as Akkermansia muciniphila and Lactobacillus in gut microbiota, compared to the normal group. This study suggests that fermented A. argyi H. with Lactobacillus plantarum could be used as a dietary antioxidant and immune enhancement agent.