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姜君中,崔相道,李乙熙,閔永鳳,金泰圭,金炯甲,朱玉守 진주산업대학교 1989 論文集 Vol.27 No.-
살균전 통조림 내용물의 온도와 냉각처리 유무가 통조림의 살균에 미치는 영향을 조사하였다. 살균시간을 최소화하고 레토르트안과 통조림냉점의 두 곳에서 온도를 감지하여 치사율의 적산치를 계속적으로 이행할 수 있는 컴퓨터시스템을 이용하였다. 8% 벤토나이트 분산액을 301-5호관에 채우고 반복 실험을 통해서 내용물의 초온의 차이와 냉각수의 처리 유무 공히 살균시간에 뚜렷한 영향을 미쳤다. The effect of initial can temperatures and water cooling treatment on the cans for thermal sterilization was described. The accumulated lethal rate method based on microcomputer-based electronic system has introduced in this experiments to minimize the process time and provide precise temperature measurements at 2 points with continuous calculation of the lethal rate. According to a series of experiments which were performed by using 301-5 cans of 8% bentonite suspension, there was significant effect in accumulated lethal rate initiated in different temperatures and treated water cooling treatment.
Efficacy of rapeseed residue and eggshell waste on enzyme activity and soil quality in rice paddy
Lee, Sang Soo,Abd El-Azeem, Samy A.M.,Lim, Jung Eun,Rajapaksha, Anushka Upamali,Kim, Kwon-Rae,Lee, Young Han,Lee, Yong Bok,Chang, Yoon-Young,Ok, Yong Sik Taylor Francis 2013 Chemistry and ecology Vol.29 No.6
Atomic Structure of Sb/Si(111)- 5√3×5√3 Surface
LEE, El-Hang,YUN, Wan Soo,PARK, Kang-Ho,YI, Jae-Yel,HA, Jeong Sook,PARK, Seong-Ju 東亞大學校附設基礎科學硏究所 1998 基礎科學硏究論文集 Vol.15 No.1
We investigated 5√3×5√3 atomic structure of an Sb-passivated Si(111) surface using low energy electron diffraction(LEED) and scanning tunneling Microscope (STM). This interesting structure with large unit cell has been analyzed with high resolution STM images in detail. The proper structural model is suggested in order to describe the STM image and other experimental results. They are understood within the frame of Si(111)-5×5 DAS (dimer adatom stacking fault) structure having the site-selective replacement of Si atoms with Sb atoms.
El-Naggar, Ali,Lee, Sang Soo,Awad, Yasser Mahmoud,Yang, Xiao,Ryu, Changkook,Rizwan, Muhammad,Rinklebe, Jö,rg,Tsang, Daniel C.W.,Ok, Yong Sik Elsevier 2018 Geoderma Vol.332 No.-
<P><B>Abstract</B></P> <P>The impact of biochar (BC) application on soil varies with BC feedstock and soil type. The objective of this study was to investigate the linkage between the properties and surface functionality of various BCs and their role in the rehabilitation of two infertile soils. Sandy loam (SL) and sandy (S) soils were collected from agricultural areas in Korea and Vietnam, respectively. The BCs of amur silvergrass residue (AB), paddy straw (PB), and umbrella tree (UB) were applied to the soils at a rate of 30 t ha<SUP>−1</SUP> and incubated at 25 °C for 90 d. Soil carbon (C) mineralization was investigated by a periodic measurement of CO<SUB>2</SUB> efflux. Soil texture strongly influenced the CO<SUB>2</SUB> efflux more than the BC type as indicated by 2–4 folds increase in cumulative CO<SUB>2</SUB>-C efflux from the SL soil compared to that from the S soil. For the PB-, AB-, and UB-treated S soils, the values of cation exchange capacity (CEC) were increased by 906%, 180%, and 130%, respectively, compared to that of the control; however, for the PB-treated SL soil, only a 13% increase in CEC was found. The pH in the PB-treated S soil sharply increased by 4.5 units compared to that in the control, due to a high concentration of readily soluble compounds in the PB and the low buffering capacity of the S soil. The S soil was more sensitive to the addition of BCs than the SL soil. A more prominent improvement in soil fertility can be achieved by BC application to the sandy soil having low clay, nutrient, and organic matter contents.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The influence of biochar varied strongly according to the types of feedstock/soil. </LI> <LI> The paddy straw biochar caused an abrupt increase in pH in the sandy soil. </LI> <LI> The CO<SUB>2</SUB> efflux rates depend more on soil texture than type of biochar. </LI> <LI> The sandy soil was more sensitive to the addition of biochar than the sandy loam soil. </LI> <LI> Biochar significantly improved the physicochemical properties of the sandy soil. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lee, Sung Joong,Park, Semin,Choi, Jin Young,Shim, Jae-Han,Shin, Eun-Ho,Choi, Jeong-Heui,Kim, Soo Taek,Abd El-Aty, A. M.,Jin, Jong Sung,Bae, Dong Won,Shin, Sung Chul John Wiley Sons, Ltd. 2009 Biomedical chromatography Vol.23 No.7
<P>It would be preferable for pesticide residues substituted by hydrolyzable functionality to be analyzed after cooking because their structures are apt to degrade during boiling and/or heating. A liquid chromatography–tandem mass spectrometry (LC-MS/MS) method for the quantitative determination of 44 pesticide residues with hydrolyzable functional group in five typical vegetable widely consumed in Republic of Korea is described. The sample clean-up was carried out according to the method of Food Code No. 83 established by the Korea Food and Drug Administration (KFDA). Zorbox XDB-C<SUB>18</SUB> column was selected for the analysis because of the best peak separation. The LC mobile phase consisted of water and 5 mm methanolic ammonium formate, which resulted in a peak shape with good symmetry at each run. Tandem mass spectroscopic (MS/MS) experiments were performed in ESI positive mode and the multiple reaction monitoring modes. A conventional matrix effect was modified to more comprehensive form 100γ<SUB>ij</SUB> (%). A high matrix effect (<−30%) was detected for the seven polar pesticides, namely thiamethoxam, clothianidin, acetamiprid, aldicarb, thiacloprid, pirimicarb and methabenzthiazuron. The limits of detection were in the range of 0.1–8.1 µg/kg, indicating a good sensitivity. Most of the recoveries ranged from 70 to 131% with RSDs ≤ 20%. The current method allowed rapid quantitation and identification of low pesticide levels in the cooked vegetable samples. Of the screened pesticide residues, only fluquinconazole and dimethomorph below the maximum residue levels established by the KFDA were detected in onion and cucumber samples. Copyright © 2009 John Wiley & Sons, Ltd.</P>