http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
채소 퇴화종자와 건전종자 침지용액의 전기전도도, 유기및 무기성분의 차이
민태기 한국작물학회 1995 Korean journal of crop science Vol.40 No.4
종자가 수분을 흡수할 때 특히 퇴화종자에서 종자의 내용물질을 밖으로 누출하는데 Brassica속의 종자는 총광물질인 sinapine이 누출되는 것을 이용하여 퇴화종자를 선별하는 기술이 개발되어 있다. 따라서 본 시험에서는 무, 배추, broccoli, 참깨, 양파, 당근종자에서 sinapine이외에 전기전도도, 무기성분(K, Ca, Mg, Na), 전당, 아미노산 등의 성분들이 퇴화종자와 건전종자 사이에 어떠한 차이로 누출되는지를 검토하여 이들 성분을 이용할 때 퇴화종자를 검정할 수 있는 지표로 사용될 수 있는지를 검토하였다. 1. 종자침청호액의 전기전도도는 퇴화종자에서 시간이 경과할수록 높아졌는데 십자화과 종자인 무, 배추, broccoli종자에서 뚜렷한 차이가 있었으나 양파와 당근종자에서는 전기전도도도 낮았고 차이도 거의 없었다. 2. 무기물의 누출에서는 무기성분중 potassium이 가장 많이 누출되었으며 퇴화종자와 건전종자 사이의 차이도 컸지만 기타 Ca, Mg, Na에서는 누출양도 적었고 차이도 적었다. 또 십자화과 종자에서는 누출이 많았고 양파와 당근종자에서는 누출이 적었다. 3. 전당의 누출도 퇴화종자에서 건전종자보다 높았으며 역시 십자화과 종자에서 누출양과 차리가 컸으나 양파, 당근종자에서는 누출양과 차이가 적었다. 4. 아미노산의 누출도 퇴화종자와 건전종자사이에 차이가 컸으나 품종간 차이가 다양하였고 십자화과 종자에서 누출양이 많았으나 양파나 당근종자에서는 누출양이나 차이가 적었다. 5. 전당과 아미노산은 종자침청 후 약 4시간에서부터 건전종자와 퇴화종자에서 누출양의 차이를 보였다. The leakage characteristics of electrical conductivity, inorganic constituents-K, Ca, Mg and Na, total sugar and total amino acid from the exudates of some vegetable seeds of viable and non-viable(artificially aged) were quantified to get basic information about the detection of the non-viable seeds. The crops studied were radish, cabbage, broccoli, onion and carrot. The time course electrolyte leakage was different from viable and non-viable seed of cruciferae but not sensitive in onion and carrot seed In inorganic constituents, potassium leakage was the greatest amount and difference between viable and non-viable seeds, but Ca, Mg and Na leakages were not as much differences as potassium. Total sugar as glucose and total amino acid as glycin leaked a lot more in aged radish, cabbage and broccoli seed than non-aged seed and the large differences were appeared after 4 hour imbibition. As a results, in general the leakages from the aged seeds were greater than from the non-aged seeds in most components tested but they were varied depending on species or varieties and components.
민태기,홍바른 한국원예학회 2013 Horticulture, Environment, and Biotechnology Vol.54 No.3
The viability of radish (Raphanus sativus L.) and Chinese cabbage (Brassica rapa ssp. pekinensis ) seeds were evaluated using a seed leachate treated ninhydrin reagent that develops color from amino acid leakage. Three different cultivars of artificially aged radish and Chinese cabbage seeds were used for this purpose. The radish and Chinese cabbage seeds were individually soaked in distilled water and treated with the ninhydrin reagent. A clearly distinct purple color was observed for the treated seed leachate, with intensities that varied depending on the seed quality. Depending on the intensity, the color could be classified into four separate fractions: colorless, weak, medium or strong. Color absorbance values were classified into 9 fractions for radish seeds and 11 fractions for Chinese cabbage seeds. Subsequently, a germination test was performed with the seeds in any given fraction (classified by color intensity and absorbance) and correlations between germination and color intensity or absorbance were evaluated. In a test of three cultivars of artificially aged radish and Chinese cabbage seeds, the relationship between percent germinated and color intensity appeared to have a very high negative correlation in linear regression, with r2 = 0.97for radish seeds and r2 = 0.95 for Chinese cabbage seeds. Similarly, the relationship between the percent germinated and the absorbance had a high negative correlation, with r2 = 0.90 for radish seeds and r2 = 0.94 for Chinese cabbage seeds. In conclusion, the simple detection of amino acid leakage with ninhydrin reagent was successful at assessing individual seed quality, as high correlations between germination and color intensity/absorbance were revealed.
원관내 Bingham Plastic의 층류 대류 열전달(2) 수치해석적 연구-속도분포 발달유동과 속도 및 온도분포 동시 발달유동
민태기,최형권,최해천,유정열,Min, Tae-Gi,Choe, Hyeong-Gwon,Choe, Hae-Cheon,Yu, Jeong-Yeol 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.12
Hydro dynamically developing and simultaneously (hydro dynamically and thermally) developing laminar flows of a Bingham plastic in a circular pipe have been investigated numerically. Solutions have been obtained by using a four-step fractional method combined with an equal order bilinear finite element method. For the hydro dynamically developing flow, shorter entrance length is required to reach fully developed velocity field for larger yield stress and non-monotonic pressure drop along the pipe centerline is observed when the yield stress exceeds a certain critical value. For the simultaneously developing flow, the heat transfer characteristics show the same trends as those predicted for the thermally developing flow (Graetz problem).
민태기,유정열,최해천,Min, Tae-Gee,Yoo, Jung-Yul,Choi, Hae-Cheon 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.9
This study examines the effects of the discretization schemes on numerical solutions of viscoelastic fluid flows. For this purpose, a temporally evolving mixing layer, a two-dimensional vortex pair interacting with a wall, and a turbulent channel flow are selected as the test cases. We adopt a fourth-order compact scheme (COM4) for polymeric stress derivatives in the momentum equations. For convective derivatives in the constitutive equations, the first-order upwind difference scheme (UD) and artificial diffusion scheme (AD), which are commonly used in the literature, show most stable and smooth solutions even for highly extensional flows. However, the stress fields are smeared too much and the flow fields are quite different from those obtained by higher-order upwind difference schemes for the same flow parameters. Among higher-order upwind difference schemes, a third-order compact upwind difference scheme (CUD3) shows most stable and accurate solutions. Therefore, a combination of CUD3 for the convective derivatives in the constitutive equations and COM4 for the polymeric stress derivatives in the momentum equations is recommended to be used for numerical simulation of highly extensional flows.
원관내 Bingham Plastic의 층류 대류 열전달(1)해석적 연구-완전발달유동과 온도분포 발달유동(확장된 그래츠문제)
민태기,유정열,최해천,Min, Tae-Gi,Yu, Jeong-Yeol,Choe, Hae-Chun 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.12
Thermally fully developed and thermally developing laminar flows of a Bingham plastic in a circular pipe have been studied analytically. For thermally fully developed flow, the Nusselt numbers and temperature profiles are presented in terms of the yield stress and Peclet number, proposing a correlation formula between the Nusselt number and the Peclet number. The solution to the Graetz problem has been obtained by using the method of separation of variables, where the resulting eigenvalue problem is solved approximately by using the method of weighted residuals. The effects of the yield stress, Peclet and Brinkman numbers on the Nusselt number are discussed.