http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Effects of gamma irradiation and Shewanella putrefaciens on the sorption of uranium by goethite
Lee, Jae-Kwang,Lee, Seung-Yeop,Jeong, Jongtae,Baik, Min-Hoon Springer-Verlag 2016 Journal of radioanalytical and nuclear chemistry Vol.307 No.3
<P>Batch experiments were carried out to investigate the influence of gamma irradiation and an iron-reducing bacterium (Shewanella putrefaciens) on the sorption of uranium by goethite in an anoxic condition. Samples were irradiated using a Co-60 gamma source for 5 days at a dose rate of 2 Gy/h for a total dose of 230 Gy. The ionizing radiation and microbial activity may induce the reductive dissolution of goethite, which subsequently may influence the redox behavior of uranium in a deep geological environment. Moreover, gamma irradiation improves the microbial activity, which resulted in the increase of the sorption of uranium.</P>
Lee, Jongtae,Park, Kyuhyun Korean Society of Food and Agricultural Informatio 2017 Agribusiness and Information Management Vol.9 No.2
This study aims to understand why public information systems in agricultural fields have shown lower performances than other industrialized fields and industries and how these problems would be fixed and overcame. To accomplish this research purpose, this study would overview the previous studies on developing agricultural information systems in public sectors and would find out meaningful and considerable factors. This study would accept the methodologies of literature review and systems thinking approaches to understand the relationships among the found factors and to suggest the conceptual research model. Agricultural information system should take care to reduce implement and maintenance costs to reduce the negative relationships between costs and expected service value and between expected service value to perceived service value. Also, it should be understood that impersonal response would reduce the eager to use the services, so the government sectors should consider positively to adopt the concept of CRM even though the government sectors traditionally have ignored its necessity. The failure of public information systems/services may be caused not only by lack of the contents but also by the failure of the persistent post management.
Lee, Jongtae,Hwang, Sunkyoung,Lee, Seongtae,Ha, Injong,Hwang, Haejun,Lee, Sangdae,Kim, Juyeon American Society for Horticultural Science 2014 HortScience Vol.49 No.12
<P>This study aimed to compare agricultural practices, soil physical and chemical properties, growth characteristics, and nutrient uptake of bulb onions from organic and conventional farms in southeastern Korea during the 2011-12 growing season. Soil and plant samples were collected from eight certified organic fields managed organically for more than 5 years and eight conventional fields adjacent to the organic fields. The amounts of nutrients applied to onion fields were approximately two times greater with the conventional methods than with organic methods. However, the soil physical and chemical properties were not significantly different between the organic and conventional systems, except for NO3-N in early May. Growth characteristics were significantly different in early April with organic bulb yield of 55.9 t·ha<SUP>−1</SUP>, which was 21.8% lower than conventionally produced onions. Yield reduction in organic onions was the result of lower large-sized (8 cm or greater) bulb yield compared with conventional production. In the conventional system, phosphorus (P) and potassium (K) content of leaf tissue in early April, and nitrogen (N) and P content of bulb tissue in early May were higher than those in the organic system. Uptake of all nutrients was greater in the conventional onions compared with the organic onions, except for leaf tissue at harvest. In conclusion, organic onions began to grow and absorb soil nutrients later than the conventional onions in the initial vegetative growth stage. Moreover, it led to an organic onion producing a lower bulb yield. To accelerate the initial growth of the organic onion plant, agricultural practices need to be modified. Modifications that may help include using larger sized seedlings at transplanting, covering the plants with nonwoven fabric or transparent plastic film to increase warmth during winter, and harvesting the onions 1 week later than the conventional onions.</P>
Lee, Jongtae,Jeon, Sangil,Hong, Taegon,Han, Seunghoon,Yim, Dong-Seok Springer 2015 European journal of clinical pharmacology Vol.71 No.11
<P>This study aimed to determine the effect of PET scan timings on the reliability of occupancy parameter estimates and to identify the scan timing design that gives the most reliable occupancy parameter estimates.</P>
Coffee-Driven Green Activation of Cellulose and Its Use for All-Paper Flexible Supercapacitors
Lee, Donggue,Cho, Yoon-Gyo,Song, Hyun-Kon,Chun, Sang-Jin,Park, Sang-Bum,Choi, Don-Ha,Lee, Sun-Young,Yoo, JongTae,Lee, Sang-Young American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.27
<P>Cellulose, which is one of the most-abundant and-renewable natural resources, has been extensively explored as an alternative substance for electrode materials such as activated carbons. Here, we demonstrate a new class of coffee-mediated green activation of cellulose as a new environmentally benign chemical-activation strategy and its potential use for all-paper flexible supercapacitors. A piece of paper towel is soaked in espresso coffee (acting as a natural activating agent) and then pyrolyzed to yield paper-derived activated carbons (denoted as 'EK-ACs'). Potassium ions (K+), a core ingredient of espresso, play a viable role in facilitating pyrolysis kinetics and also in achieving a well-developed microporous structure in the EK-ACs. As a result, the EK-ACs show significant improvement in specific capacitance (131 F g(-1) at a scan rate of 1.0 mV s(-1)) over control ACs (64 F g(-1)) obtained from the carbonization of a pristine paper towel. All-paper flexible supercapacitors are fabricated by assembling EKACs/carbon nanotube mixture-embedded paper towels (as electrodes), poly(vinyl alcohol)/KOH mixture-impregnated paper towels (as electrolytes), and polydimethylsiloxane-infiltrated paper towels (as packaging substances). The introduction of the EKACs (as an electrode material) and the paper towel (as a deformable and compliant substrate) enables the resulting all-paper supercapacitor to provide reliable and sustainable cell perforinance as well as exceptional mechanical flexibility. Notably, no appreciable loss in the cell capacitance is observed after repeated bending (over 5000 cycles) or multiple folding. The coffee mediated green activation of cellulose and the resultant all-paper flexible supercapacitors open new material and system opportunities for eco-friendly high-performance flexible power sources.</P>
Jongtae Lee,Juyeon Kim,Jin-HyeukKwon,Young-Ho Chang,Young-Seok Kwon,Tae-Ja Kim,Mi-Jung Park,Mi-Ae Kim,Hyang-Mi Lee 한국원예학회 2020 Horticulture, Environment, and Biotechnology Vol.61 No.6
We evaluated and classifi ed forty fi ve onion cultivars according to bulb initiation, bulb and scale characteristics, mineralsand organic compounds contents, and storage quality in South Korea during 2016/2017 and 2017/2018 growing seasons. Field experiment was conducted in randomized block design with three replications. Bulb initiation ranged from 153 daysafter transplanting (DAT, April 2) to 177 DAT (April 26). Fresh bulb weight (FBW) and bulb index (BI) were 285.5 ± 18.5 g/individual, 0.93 ± 0.05, respectively. Number of scales (NS), number of center (NC), and scale thickness (ST) were 7.6 ± 0.2,2.3 ± 0.2, and 5.5 ± 0.2 mm/scale, respectively. Chroma and Lightness of bulb skin were 27.1 ± 1.9, 61.2 ± 2.3, respectively. Storage loss (SL) on December 12 was 19.4 ± 5.9%. Nitrogen (N), Carbon (C) and sulfur (S) contents were 1.36 ± 0.14,37.9 ± 3.2 and 0.40 ± 0.06 mg kg −1 on a fresh weight basis. Total soluble solids (TSS) and total phenolics content (TPC) were8.6 ± 0.6 °Bx, 164.8 ± 15.6 mg GE kg −1 on a fresh weight basis. Days from transplanting to bulb initiation was signifi cantlypositively correlated with bulb height, NC, dry matter, N, C, S, TSS, TPC, total fl avonoids content (TFC) etc., while it wasnegatively correlated with rot loss and SL. Dry matter content was signifi cantly positively correlated with N, C, S, TSS,TPC, TFC etc., while it was negatively correlated with SL. Storage loss was negatively correlated with N, S, Potassium andTSS. Dendrogram of agglomerative hierarchical clustering for the forty fi ve cultivars based on bulb initiation, bulb and scalecharacteristics, and bulb minerals and organic compounds contents classifi ed fi ve cultivar groups. Cluster 1 featured the earliestbulb initiation and the greatest SL. Cluster 2 featured the fewest NS and NR, and the thickest ST. Cluster 3 featured thegreatest FBW, and the most NS and NC. Cluster 4 featured the greatest BI and the thinnest ST. Cluster 5 featured the lowestSL, and the highest minerals and antioxidant compounds contents. This information should be helpful for onion growers todecide onion cultivar and for onion breeders to promote new cultivars depending on their purpose.