http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Park, Kyungtae,Jeong, Hyejoong,Tanum, Junjira,Yoo, Jae-Chan,Hong, Jinkee Elsevier 2019 Journal of industrial and engineering chemistry Vol.69 No.-
<P><B>Abstract</B></P> <P>Nitric oxide (NO) gas is an endogenously produced radical gas involved in numerous physiological and pathological processes in the human body and shows potential for biomedical applications. Numerous studies have attempted to develop an NO-releasing platform in the past few decades. To take advantage of exogenous NO gas delivery, controlling the total concentration and release profile are the most important factors. To develop a controlled NO-releasing system, we used the poly-<SMALL>L</SMALL>-lysine (PLL) and poly-<SMALL>L</SMALL>-glutamic acid (PGA) because of their high biocompatibility in biomedical applications. We constructed (PLL/PGA)<SUB>n</SUB> multilayer thin films using the layer-by-layer self-assembly technique. We then synthesized the <I>N-</I>diazeniumdiolate, a proton<I>-</I>responsive NO donor, into the polypeptide multilayer film in a high-pressure reaction under NO gas. We investigated the film growth profile by quartz crystal microbalance and thickness measurements and determined the film surface morphology by scanning electron microscopy and atomic force microscopy. By comparing films with different thicknesses, we confirmed NO donor formation by UV–vis and Fourier-transform infrared spectroscopy. We also determined the release profiles of each film using a real-time NO analysis machine (NOA280i).</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kyungtae Park,Sang Yeob Lee,Boran Ji,Hamin Lee,Bo-Kook Jang,Ju-Sung Cho 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10
This study has stored Pulsatilla dahurica (Fisch. ex DC.) Spreng. seeds, which is known to be short in storage life, in various temperatures for one year to observe the changes in germinability and anticipated the appropriate storage temperature by performing accelerated aging experiment. Seeds for storage were collected in Andong-si, Gyeongsangbuk- do, late May 2020 and were sealed in plastic bag after the cleaning and stored in ‒20, 4, and 25°C chamber for one year. Control seeds used for Saturated Salt Accelerated Aging (SSAA) test was collected in early June 2021 at the same place. Each seed had measured of their sizes, weight of one thousand seeds, moisture content, E:S ratio, viability, and 4 weeks of initial percent germination, after the collection. SSAA test was performed using aging tray installed seed testing container with 40mL of saturated salt solution (NaCl). Seeds were aged for 72h at 41 and 47°C then their viability was measured with TZ test and were incubated in the chamber. After one year, germinability of stored seeds were measured with their percent germination (PG), start of germination (SG), mean germination time (MGT) and median germination time (T50) in 25/15°C (16/8h, White-LED, 30 μmol/m<SUP>-2</SUP>/s<SUP>-1</SUP> PPFD/Dark) chamber. As a result, seeds from both lots had E:S ratio of 0.23~0.24 indicating that they are morphologically immature. Initial viability of seed lots was over 98% and the PG had scored 97.5 (2020) and 98.0% (2021). PG of the seeds stored for one year in various temperatures were measured 100 (‒20°C), 98.5 (4°C) and 96.5% (25°C) which had no significant difference. However, SG was reduced to 11.2 (‒20°C), 11.5 (4°C) and 12.8 d (25°C) when compared to 15.0 before the storage. MGT and T50 were also reduced to 9.0 to 9.5 and 10.5 to 11.9 d respectively than the seeds before storage (18.0 and 17.5 d). Viability of SSAA tested stored seeds were 96 and 6 (‒20°C), 97 and 12 (4°C), 58 and 0% (25°C), 90 and 27% (non-stored) at 41 and 47°C respectively. On the other hand, SSAA tested seeds showed lower percent germination value than the measured viability. Percent germination of seeds with accelerated aging at 41°C were 44 (‒20°C), 66 (4°C) and 2% (25°C) which were lower than that of non-stored seeds (80%) and among them, the seeds stored at 4°C showed the highest value. Non-stored seeds with accelerated aging at 47°C showed percent germination of 28% where all the other stored seeds did not germinate. Therefore, the two experiments have confirmed that P. dahurica seeds do not deteriorate in their germinability even after one year of storage and SSAA test have proven that seeds stored at 4°C can preserve the viability relatively longer. Additionally, viability and the actual germinability of aged P. dahurica seeds are found to have some differences.
Kyungtae Park,윤인섭,신동일,Gibaek Lee 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.9
This paper presents the results of the cost of energy (COE) analysis of an integrated gasification combined cycle (IGCC) power plant with respect to CO2 capture ratio under the climate change scenarios. To obtain process data for a COE analysis, simulation models of IGCC power plants and an IGCC with carbon capture and sequestration (CCS)power plant, developed by the United States Department of Energy (DOE) and National Energy Technology Laboratory (NETL), have been adopted and simulated using Aspen Plus. The concept of 20-year levelized cost of energy (LCOE),and the climate change scenarios suggested by International Energy Agency (IEA) are also adopted to compare the COE of IGCC power plants with respect to CO2 capture ratio more realistically. Since previous studies did not consider fuel price and CO2 price changes, the reliability of previous results of LCOE is not good enough to be accepted for an economic comparison of IGCC power plants with respect to CO2 capture ratio. In this study, LCOEs which consider price changes of fuel and CO2 with respect to the climate change scenarios are proposed in order to increase the reliability of an economic comparison. And the results of proposed LCOEs of an IGCC without CCS power plant and IGCC with CCS (30%, 50%, 70% and 90% capture-mole basis- of CO2 in syngas stream) power plants are presented.