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유기질비료 시비량에 따른 오미자 묘목의 초기 생육특성에 관한 연구
이경아,박태호,박성용,김도현,오문국,김민수,안태진,이상원,김영국,안영섭,박충범,차선우,송범헌 忠北大學校 農業科學硏究所 2015 農業科學硏究 Vol.31 No.1
This study was carried out to have basic and applied informations to find the optimum nitrogen fertilization level for organic cultivation and to investigate early growth characteristics of Schizandra chinensis Baillon. Different application levels of the organic fertilizer were based on the recommended rate of N fertilizer. Five different levels of the organic fertilizer were applied to S. chinensis and early growth responses such as the length of vine, the diameter of vine, the number of leaves, and the number of branches were investigated. Lengths of main and total vines were shown longer at the level of 1.0 time organic fertilizer than those at others. The vine length at early growth was the highest at the level of 1.0 time organic fertilizer among the treatments. Stem diameter was shown thicker level of 1.0 time organic fertilizer than others on August and September, whereas on October it was the thickest in the conventional cultivation. Number of leaf was increased higher at the level of 1.0 and 2.0 times organic fertilizer than that in the compared to conventional. The number of branches was appeared the lowest at the level of 1.0 time organic fertilizer at early growth, however they were increased through progressing their growth stages. They were not significantly difference among the treatments except for the level of 2.0 times organic fertilizer. Based on the research results, the growth of S. chinensis was commonly higher at the level of 1.0 time organic fertilizer compared to other treatments.
WEN, JIN,CHENG, JUN-FENG The Korean Society for Computational and Applied M 2017 Journal of applied mathematics & informatics Vol.35 No.5
This paper investigates the inverse problem of determining an unknown heat radiative coefficient, which is only time-dependent. This is an ill-posed problem, that is, small errors in data may cause huge deviations in determining solution. In this paper, the existence and uniqueness of the problem is established by the second Volterra integral equation theory, and the method of trace-type functional formulation combined with finite difference scheme is studied. One typical numerical example using the proposed method is illustrated and discussed.
Lycorine: A Potential Broad-Spectrum Agent Against Crop Pathogenic Fungi
( Jin Wen Shen ),( Yuan Ruan ),( Wei Ren ),( Bing Ji Ma ),( Xiao Long Wang ),( Chun Feng Zheng ) 한국미생물 · 생명공학회 2014 Journal of microbiology and biotechnology Vol.24 No.3
A screening test showed that lycorine exhibited significant antifungal activity against 24 pathogenic crop fungi at concentrations of 500μg/ml and 100μg/ml, respectively. Fusarium graminearum was selected for antifungal mechanism studies by observing its mycelial morphology and investigating the variations in its conductivity. In addition, the substance absorption and metabolism of F. graminearum were explored. The mechanism was revealed as being one by which lycorine destroyed the cellular membrane and further influenced substance absorption and cell metabolism.
Colossal grain growth yields single-crystal metal foils by contact-free annealing
Jin, Sunghwan,Huang, Ming,Kwon, Youngwoo,Zhang, Leining,Li, Bao-Wen,Oh, Sangjun,Dong, Jichen,Luo, Da,Biswal, Mandakini,Cunning, Benjamin V.,Bakharev, Pavel V.,Moon, Inyong,Yoo, Won Jong,Camacho-Mojica American Association for the Advancement of Scienc 2018 Science Vol.362 No.6418
<P><B>Turning many into one</B></P><P>Single-crystal metal foils are valuable for their surface properties that allow for synthesis of materials like graphene. Jin <I>et al.</I> present a strategy for creating colossal single-crystal metal foils called “contact-free annealing” (see the Perspective by Rollett). The method relies on hanging and heating commercially available, inexpensive, cold-rolled metal foils. Almost as if by magic, the polycrystalline grains rotate and anneal into a large single-crystal sheet with a specific crystal orientation. The strategy allows for the creation of much larger and much cheaper single-crystal metal foils.</P><P><I>Science</I>, this issue p. 1021; see also p. 996</P><P>Single-crystal metals have distinctive properties owing to the absence of grain boundaries and strong anisotropy. Commercial single-crystal metals are usually synthesized by bulk crystal growth or by deposition of thin films onto substrates, and they are expensive and small. We prepared extremely large single-crystal metal foils by “contact-free annealing” from commercial polycrystalline foils. The colossal grain growth (up to 32 square centimeters) is achieved by minimizing contact stresses, resulting in a preferred in-plane and out-of-plane crystal orientation, and is driven by surface energy minimization during the rotation of the crystal lattice followed by “consumption” of neighboring grains. Industrial-scale production of single-crystal metal foils is possible as a result of this discovery.</P>
Preparation of highly carbonized material from nanoparticle impregnated biomass
Jin-Woo Kim,신채호,Joong-Hwan Park,Wen-Zhu Jin,배관호,Maeng Joon Jung 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.5
In this study, we impregnated nanometal samples having various concentrations 0, 1000, 3000, and 5000 ppm in biomass in order to make carbonized biomass. We analyzed the properties of the impregnated samples through thermogravimetry/differential thermal analysis (TG–DTA), iodine adsorptivity, fixed carbon ratio, pore distribution, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The best results were observed for a nanometal concentration of 5000 ppm. After the first heat treatment, carbonization, and activation processes, the fixed carbon ratio and iodine adsorptivity were increased by 11.07% and 42 mg/g, 11.07% and 198 mg/g, and 46.7% and 1185 mg/g, respectively. Through repeated experiments, we established the most effective process for impregnating a nanometal in biomass.
Antioxidant Activity of Cleomiscosins A and C Isolated from Acer okamotoanum
Wen Yi Jin,Phuong Thien Thuong,Nguyen Duy Su,민병선,손건호,장현욱,김현표,강삼식,석대은,배기환 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.3
Phytochemical investigation of Acer okamotoanum leaf and twig led to the isolation of two coumarinolignans, cleomiscosin A (1) and cleomiscosin C (2). Here, we found that 2 dose-dependently inhibits LDL oxidation mediated by either catalytic copper ions (Cu2+) or free radicals generated with the azo compound 2,2'-azobis-(2-amidinopropane)dihydro-chloride (AAPH) with IC50s of 29.5 and 11.9 µM, respectively. By electrophoretic analysis, we also observed that 2 protects apolipoprotein B-100 (apoB-100) against Cu2+-induced fragmentation (65.3% inhibition at 5 µM). Furthermore, fluorescence analyses clearly indicated that both 1 and 2 protect against the oxidative modification of apoB-100 induced by either Cu2+ or HOCl (1, IC50s of 13.4 and 8.1 µM, respectively; 2, IC50s of 23.6 and 3.9 µM, respectively). These findings suggest that 1 and 2 could be beneficial in preventing LDL oxidation in atherosclerotic lesions.
Jin Wen,Jun-Feng Cheng 한국전산응용수학회 2017 Journal of applied mathematics & informatics Vol.35 No.5
This paper investigates the inverse problem of determining an unknown heat radiative coefficient, which is only time-dependent. This is an ill-posed problem, that is, small errors in data may cause huge deviations in determining solution. In this paper, the existence and uniqueness of the problem is established by the second Volterra integral equation theory, and the method of trace-type functional formulation combined with finite difference scheme is studied. One typical numerical example using the proposed method is illustrated and discussed.
Thermo-mechanical stress analysis of feed-water valves in nuclear power plants
Wen-qing Li,Lei Zhao,Yang Yue,Jia-yi Wu,Zhi-jiang Jin,Jin-yuan Qian 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.3
Feed-water valves (FWVs) are used to regulate the flow rate of water entering steam generators, whichare very important devices in nuclear power plants. Due to the working environment of relatively highpressure and temperature, there is strength failure problem of valve body in some cases. Based on thethermo-fluid-solid coupling model, the valve body stress of the feed-water valve in the opening processis investigated. The flow field characteristics inside the valve and temperature change of the valve bodywith time are studied. The stress analysis of the valve body is carried out considering mechanical stressand thermal stress comprehensively. The results show that the area with relatively high-velocity areamoves gradually from the bottom of the cross section to the top of the cross section with the increase ofthe opening degree. The whole valve body reaches the same temperature of 250C at the time of 1894 s. The maximum stress of the valve body meets the design requirements by stress assessment. This workcan be referred for the design of FWVs and other similar valves.