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상호 결합이 선형 안테나 전류 분포와 임피던스에 미치는 영향
이일용,이범선 경희대학교 산학협력기술연구원 1996 산학협력기술연구논문집 Vol.2 No.-
Current distribution and impedance of two side-by-side dipoles are analysed using the method of moments. The currents on the dipoles are expanded using eight cosine basis functions which are considered to give very accurate results. The results for the two side-by-side dipoles reduces to those for an isolated dipole when the spacing between the two dipoles is very large. Various aspects of mutual coupling when the spacing is very small are interpreted using the obtained current distribution. The effects of mutual coupling on the antenna pattern are also considered in this paper.
배양액내 $\textrm{NO}_3^\;-$, $\textrm{K}^+$ 및 $\textrm{Ca}^{++}$ 농도가 무등산수박 유묘 생장에 미치는 영향
이범선,정순주,박순기 (사)한국생물환경조절학회 1998 시설원예‧식물공장 Vol.7 No.3
본 실험은 전남대학교 농과대학 연구온실에서 무등산수박의 건묘 생산에 있어 묘의 소질을 결정하는 NO$_{3}$$^{1}$, $K^{+}$ 및 $Ca^{++}$을 농도별(Total-N=94, 106, 112, 206, 406ppm; $K^{+}$= 100, 150, 200, 400ppm; $Ca^{++}$= 80, 150, 200, 320ppm)로 처리하여 분석한 결과 배양액의 N 농도를 증가시킬수록 초장, 엽면적, 엽수, 지상부의 생체중 및 건물중이 증가하였다. 그러나 K 농도를 증가시켰을 경우 수박 유묘의 초장은 200ppm까지는 약간 증가하지만 200ppm 이상으로 증가시키면 엽면적, 엽수, 엽장, 생체중 및 건물중이 감소하였다. Ca처리의 경우도 농도의 증가에 따른 엽면적과 엽생체중 및 건물중의 감소가 현저하였다. N의 농도를 206ppm으로 증가시킨 경우 무등산수박 묘의 엽병내 N, K 및 Mg의 함량은 증가하였지만 P 및 Ca의 함량은 차이를 보이지 않았다. K의 농도를 150ppm으로 증가시킨 경우 수박유묘의 엽병내 N, K 및 Mg의 함량이 증가한 반면 200ppm이상으로 증가시킨 경우에는 N와 Mg의 감소가 나타났으며 P 및 Ca의 함량은 차이를 보이지 않았다. 그러나 배양액에 Ca의 농도를 증가시킨 경우 엽병내 N, K, Ca 및 Mg의 농도가 증가하는 반면 200ppm 이상에서는 N의 감소가 관찰되었다. This experiment was conducted to investigate the effects of concentration of NO$_{3}$$^{[-10]}$ , $K^{+}$ and $Ca^{++}$ in nutrient solution on the seedlings growth of ‘Mudeungsan’watermelon. Seeds were sown on March 16, 1997. NO$_{3}$$^{[-10]}$ , $K^{+}$ and $Ca^{++}$ was treated with three different levels, respectively, NO$_{3}$$^{[-10]}$ = 106, 206, 406ppm; $K^{+}$ = 150, 200, 400 ppm; $Ca^{++}$ = 150, 200, 400 ppm. Plant growth was investigated at four-days interval in 10 days after treatment. Increasing N concentration in the nutrient solution increased the plant height, leaf area, number of leaves, fresh and dry weight of shoot while high concentration of K and Ca in the nutrient solution decreased the seedling growth in terms of leaf area, leaf dry weight. The uptake of N, K and Mg in petiole sap was positively affected by the adding of 206 ppm of nitrate, 150 ppm of potassium and 200 ppm of calcium levels, respectively. The P and Ca uptake in petiole sap was not affected by the N and K concentrations in the nutrient solution while K concentration above 200 ppm decreased the N and Mg content in petiole sap. High concentration of Ca in the nutrient solution increased the Ca content in petiole sap while Ca concentration above 200 ppm decreased the N content.
이범선,Jeon Yong Hwan,Ju Se Hun,고윤,박진섭,이준우,Yang Huijun,나해영 한국원예학회 2023 Horticulture, Environment, and Biotechnology Vol.64 No.6
This study investigated the diff erences in light intensity, photosynthetic effi ciency, and growth characteristics of paprika plants cultivated in a semi-closed greenhouse covered with low-iron diff use glass (SG-LDG) and a conventional greenhouse covered with low-iron regular glass (CG-LRG). There was no signifi cant diff erence in light intensity between the SG-LDG and CG LRG from the apical meristem to below 100 cm. However, below 150 cm, the SG-LDG showed higher light intensity than the CG-LRG. The light response curve and atmospheric CO 2 response(A-C a ) curve, which represent photosynthetic effi ciency, were not signifi cantly aff ected by crop canopy diff erences between the two greenhouses during the early cultivation stage. However, after 12 weeks of planting, SG-LDG showed higher photosynthetic effi ciency. The J max and V cmax values showed no diff erences between the plants in the two greenhouses until 4 weeks after planting. 12 weeks after planting, plants in SG-LDG showed higher J max and V cmax values than those in CG-LRG. All the growth characteristics of plants cultivated in SG-LDG were superior to those of plants cultivated in CG-LRG. Therefore, the improvement in light intensity and photosynthetic effi ciency at the lower positions of plants in SG-LDG is considered to have a positive impact on crop quantity and quality.