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The Mercury Adsorption Efficiency of Activated Carbon Prepared by Sewage Sludge Depending on HCl
( Jeongmin Park ),( Sang-sup Lee ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 ISSE 초록집 Vol.2019 No.-
Mercury is released by the combustion of fossil fuels. Mercury is emitted in three forms: oxidized mercury (Hg<sup>2+</sup>), elemental mercury (Hg<sup>0</sup>) and particulate mercury (Hg<sub>P</sub>). Since elemental mercury is difficult to capture by conventional air pollution control devices, additional activated carbon injection method is used. Mercury adsorption is affected by the composition of the acid gas. Among them, HCl is known to increase the mercury adsorption efficiency of activated carbon. In this study, sewage sludge was used as raw material of activated carbon as an alternative disposal method of sewage sludge. In order to investigate the effect of HCl on mercury adsorption using activated carbon prepared from sewage sludge, two different simulated flue gas conditions were used: 12% CO<sub>2</sub>, 5% O<sub>2</sub>, 7% H<sub>2</sub>O, 70 - 80 μg/m<sup>3</sup> Hg<sup>0</sup>, 200 ppm SO<sub>2</sub>, 200 ppm NO, 0 ppm or 20 ppm HCl.
Jeongmin Park,Yongheon Han,Jaeyo Sin,Jeonghyun Ahn,오욱 인간식물환경학회 2023 인간식물환경학회지 Vol.26 No.5
Background and objective: The aim of this study was to elucidate the effect of varying treatment concentrations of twodifferent plant growth retardants, acting at different inhibition positions during the biosynthetic process, on the growthcharacteristics of geranium (Pelargonium × hortorum) and then to provide essential data to improve the quality of pot plantproduction. Methods: Aqueous solutions of diniconazole (Binnari) and daminozide (B-9) at concentrations of 0 (distilled water), 50, 100,200, and 400 mg⋅L-1 were prepared for the geranium 'Ringo 2000TM Deep Red'. These solutions were applied by foliarspraying twice at 10-day intervals. Growth characteristics such as plant height, leaf size and relative chlorophyll content(SPAD) were then assessed. Results: When Binnari was applied at concentrations of 0, 50, 100, 200, and 400 mg⋅L-1, the corresponding plant heightswere 29.5, 23.8, 24.1, 23.0, and 18.4 cm, respectively. There was a statistically significant decrease in plant height withincreasing concentration. Conversely, for B-9, plant height was significantly reduced to 26.7 cm only at the 400 mg⋅L-1concentration, indicating a less pronounced inhibitory effect compared to Binnari. Leaf width showed a significant decreasingtrend with increasing Binnari application concentrations and was 4.6, 4.7, 4.1, 4.2, and 3.9 cm respectively. However, therewas no significant difference due to the B-9 treatment. Chlorophyll content increased with increasing concentrations ofboth retardants. Conclusion: In conclusion, Binnari showed a greater inhibitory effect on geranium growth compared to B-9. The applicationof Binnari at 400 mg⋅L-1 resulted in the greatest increase in the ornamental value of the geranium. Furthermore, diniconazoleacts during the early stage before the splitting of the GA1 and GA4 pathways, thus inhibiting the biosynthesis of both activegibberellins. In contrast, daminozide inhibits the step just before GA1 biosynthesis. It is concluded that GA4 serves as thedominant active gibberellin in geranium plants.
Voltage Scaling of Graphene Device on SrTiO<sub>3</sub> Epitaxial Thin Film
Park, Jeongmin,Kang, Haeyong,Kang, Kyeong Tae,Yun, Yoojoo,Lee, Young Hee,Choi, Woo Seok,Suh, Dongseok American Chemical Society 2016 Nano letters Vol.16 No.3
<P>Electrical transport in monolayer graphene on SrTiO3 (STO) thin film is examined in order to promote gate-voltage scaling using a high-k dielectric material. The atomically flat surface of thin STO layer epitaxially grown on Nb-doped STO single-crystal substrate offers good adhesion between the high-k film and graphene, resulting in nonhysteretic conductance as a function of gate voltage at all temperatures down to 2 K. The two-terminal conductance quantization under magnetic fields corresponding to quantum Hall states survives up to 200 K at a magnetic field of 14 T. In addition, the substantial shift of charge neutrality point in graphene seems to correlate with the temperature-dependent dielectric constant of the STO thin film, and its effective dielectric properties could be deduced from the universality of quantum phenomena in graphene. Our experimental data prove that the operating voltage reduction can be successfully realized due to the underlying high-k STO thin film, without any noticeable degradation of graphene device performance.</P>
Jeongmin Kim,Kye Chung Park,Hyun Sik Roh,HyunWooOh,Ji-AeKim,Chung-gyoo Park 한국응용곤충학회 2015 한국응용곤충학회 학술대회논문집 Vol.2015 No.10
Sensory system of insect is important for their fitness in the environment. Riptortus pedestris (Hemiptera: Alydidae) is a major pest of bean plants and some fruit trees in Korea, Japan, China, and South Asian countries. This study was conducted to investigate morphology and distribution of antennal sensilla of R. pedestris, using scanning electron microscopy. Antennae of R. pedestris was 11 and 9.84 mm in length in male and female, respectively, and consists of four segments; scape, pedicel, flagellum 1 and 2 (F1 and F2). Five types of sensilla (s.) trichodea, four types of s. basiconica, two types of s. chaetica, and one type of s. coeloconica were preliminary identified in both sexes of adult R. pedestris, based on their size, shape, presence of socket and surface structure. Three types of trichoid sensilla, four types of basiconic sensilla, one type of chaetic sensilla and coeloconic sensilla had numerous pores along the surface of the sensilla, suggesting their olfactory function. Eight types of sensilla (3 trichoid, 2 basiconic, a chaetic and a coeloconic) showed a distinct socket structure at the base of each sensillum. Different types of sensilla showed different distribution along the antennal segments. Two types of trichoid sensilla and two types of basiconic sensilla were distributed on scape, pedicel and F1 flagella subsegment. However, the distribution of eight other types of sensilla was limited to one of two flagella subsegments.
Recovery of Decane using Three Desorption Method
( Jeongmin Park ),( Sang-sup Lee ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 ISSE 초록집 Vol.2019 No.-
Volatile organic compounds (VOCs) are generated at high concentrations in close proximity to daily life such as dry cleaning process. VOCs have an adverse effect on human health. Various methods are applied to remove these VOCs. Among them, the adsorption method is suitable for controlling high concentration VOCs. Recovery of VOCs is very important as well as adsorption. Depending on desorption method, the recovery efficiency of VOCs may vary. Therefore, in this study, desorption experiments were carried out using three different methods: (1)Air, (2)Vacuum, (3)Vacuum + air. The adsorption and desorption were conducted at room temperature, and the concentration of decane released during adsorption/desorption was measured by GC.