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김형곤 ( H. G. Kim ),전현종 ( H. J. Jun ),김진구 ( J. G. Kim ),유승화 ( S. H. Yu ),김영근 ( Y. K. Kim ),강태경 ( T. G. Kang ),최일수 ( I. S. Choi ),이상희 ( S. H. Lee ),최용 ( Y. Choi ) 한국농업기계학회 2017 한국농업기계학회 학술발표논문집 Vol.22 No.2
들깨 생산을 위한 농작업에서 경운· 정지, 피복, 방제 등은 기계화 되었으나 파종, 정식, 예취· 탈곡은 기계화가 미흡한 실정이다. 본 연구에서는 기계화가 미흡한 들깨의 탈곡작업 기계화 촉진 및 범용화를 통한 들깨 기계화기술을 향상 하고자 수행하였다. 첫 번째 수행내용은 기존 콩 탈곡기 송풍 팬에 의해 손실되는 들깨를 줄이고자 송풍 팬 속도(450~1350 RPM)에 따른 풍구속도(m/s) 및 손실량(g)을 측정하기 위해 탈곡된 들깨 500 g을 탈곡기에 투입하여 실험하였다. 두 번째 수행내용은 투입된 작물의 줄기가 탈곡 시 배출이 용이하도록 탈곡기 덮개 안쪽에 가이드를 설치하여 탈곡에 미치는 영향을 실험하였다. 탈곡시험은 가이드를 설치하지 않은 경우와 설치한 경우로 분리하여 비교시험을 하였다. 가이드는 급동 회전방향과 10°, 20°, 30°를 유지하면서 배출구까지 도달하도록 설치하였고, 각도에 따른 잔물배출시간(s), 잔물배출무게(g) 및 잔물 파쇄 길이(cm)을 측정하였다. 시험결과 들깨의 손실률이 발생되는 구간은 1050 RPM, 풍구속도 5.27 m/s였으며 송풍 팬 회전속도가 증가할수록 손실률은 급격하게 증가하였다. 이는 실험 탈곡기 구조의 들깨 종말속도가 대략 5m/s로 송풍팬 회전속도를 1000 RPM, 풍구속도를 5m/s 이하로 설정해야 할 것으로 판단된다. 가이드 각도에 따른 잔물배출시간은 각도가 클수록 잔물배출시간이 단축되었고 특히 10°(18.90 s)는 무 설치(29.23 s) 보다 약 10초 단축되어 가이드 설치가 잔물배출에 효과적으로 나타났다. 잔물배출무게는 가이드 각도에 영향을 받지 않은 반면 잔물 파쇄 길이는 가이드 각도가 클수록 길게 나타났다. 결과적으로 실험 콩 탈곡기 적용 들깨 탈곡 시 5 m/s 이하의 풍속에서 잔물배출시간과 파쇄정도에 따른 들깨 손실 등을 고려한 복합적인 연구가 필요할 것으로 판단되었다.
Mirasha Hasanthi,G.H.T. Malintha,Kwan-Sik Yun,Kyeong-Jun Lee The Korean Society of Fisheries and Aquatic Scienc 2023 Fisheries and Aquatic Sciences Vol.26 No.12
Piperine, the main bioactive component of black pepper (Piper nigrum Linn.), has anti-inflammatory, antifungal, and antibacterial properties. This study evaluated the supplemental effects of piperine or black pepper on innate immunity, growth, feed utilization efficiency, and intestinal morphology in red seabream (Pagrus major). Six experimental diets were formulated, supplementing piperine at 0.0, 0.25, 0.5, 1.0, and 2.0 g/kg levels (Con, P25, P50, P100, and P200) or 1.0 g/kg black pepper (BP100). Juvenile fish (7.6 ± 0.1 g) were randomly stocked into 18 circular tanks (220 L), including 30 fish per tank. Each diet was randomly assigned to triplicate groups, and the feeding trial was conducted for 8 weeks. The results showed that final body weight, specific growth rate, weight gain, and feed utilization efficiency were significantly improved (p < 0.05) when piperine was supplemented into diets at 0.25-2.0 g/kg levels compared to the Con group. Compared to the Con diet, condition factor was significantly increased (p < 0.05) in fish fed with dietary piperine at 0.25-2.0 g/kg or BP100 diet. Serum myeloperoxidase activity was increased (p < 0.05) in P25 and P100 groups and antiprotease activity was increased (p < 0.05) in P100 group compared to the Con group. Significantly higher (p < 0.05) lysozyme activity was observed in P50, P100, P200 and BP100 groups, while total immunoglobulin level was increased in P50, P100 and BP100 groups than Con group. Superoxide dismutase activity was increased (p < 0.05) by dietary piperine at 0.25-2.0 g/kg levels and BP100 diet compared to Con diet. Plasma cholesterol was significantly lower (p < 0.05) in fish fed with piperine (0.5-2.0 g/kg) or BP100 compared to the Con diet. Compared to the Con diet significantly longer (p < 0.05) intestinal villi were observed in fish fed with piperine at 0.25-1.0 g/kg levels, and higher goblet cell count was observed in P25 and BP100 groups. Dietary inclusion of piperine would be a potent immunostimulant in fish diet and the optimum supplementation level would be 0.25-1.0 g/kg.
Kim, U.-H.,Jun, D.-W.,Park, K.-J.,Zhang, Q.,Kaghazchi, P.,Aurbach, D.,Major, D. T.,Goobes, G.,Dixit, M.,Leifer, N.,Wang, C. M.,Yan, P.,Ahn, D.,Kim, K.-H.,Yoon, C. S.,Sun, Y.-K. The Royal Society of Chemistry 2018 Energy & environmental science Vol.11 No.5
<P>Development of advanced high energy density lithium ion batteries is important for promoting electromobility. Making electric vehicles attractive and competitive compared to conventional automobiles depends on the availability of reliable, safe, high power, and highly energetic batteries whose components are abundant and cost effective. Nickel rich Li[NixCoyMn1−x−y]O2 layered cathode materials (<I>x</I> > 0.5) are of interest because they can provide very high specific capacity without pushing charging potentials to levels that oxidize the electrolyte solutions. However, these cathode materials suffer from stability problems. We discovered that doping these materials with tungsten (1 mol%) remarkably increases their stability due to a partial layered to cubic (rock salt) phase transition. We demonstrate herein highly stable Li ion battery prototypes consisting of tungsten-stabilized Ni rich cathode materials (<I>x</I> > 0.9) with specific capacities >220 mA h g<SUP>-1</SUP>. This development can increase the energy density of Li ion batteries more than 30% above the state of the art without compromising durability.</P>
Kim, B.H.,Hong, W.G.,Moon, H.R.,Lee, S.M.,Kim, J.M.,Kang, S.,Jun, Y.,Kim, H.J. Pergamon Press ; Elsevier Science Ltd 2012 International journal of hydrogen energy Vol.37 No.19
In order to prove the existence of an optimum interlayer distance for H<SUB>2</SUB> uptake, we have obtained H<SUB>2</SUB> isotherms with respect to the interlayer distance of pillared-graphene oxide (GO) at 1.0 bar and 77 K. Interlayer distances of GO were changed by intercalation of three kinds of diaminoalkanes with a different number of carbon atoms (NH<SUB>2</SUB>(CH<SUB>2</SUB>)<SUB>n</SUB>NH<SUB>2</SUB>, n = 2, 6, 10) as pillars and changing the subsequent thermal annealing conditions. We found an optimum GO interlayer distance for maximum H<SUB>2</SUB> uptake at 6.3 A similar to the predicted distance from first-principles calculations for graphitic materials, and the value obtained from thermally modulated GO. Our results experimentally corroborate the existence of an optimum interlayer distance and demonstrate the importance of an interlayer distance for the design of materials for H<SUB>2</SUB> storage.
Bae, J.W.,Kang, S.H.,Murali Dhar, G.,Jun, K.W. Pergamon Press ; Elsevier Science Ltd 2009 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.34 No.20
Cu/ZnO/Al<SUB>2</SUB>O<SUB>3</SUB> adsorbents for removal of odorant sulfur compounds were prepared with various Al/Cu molar ratios by co-precipitation method. The sulfur removing ability as a function of Al/Cu molar ratio of the adsorbents for t-butyl mercaptan (TBM), tetrahydro thiophene (THT), dimethyl disulfide (DMS) and H<SUB>2</SUB>S were investigated at 250<SUP>o</SUP>C and 6000h<SUP>-1</SUP> space velocity. Based on the results of adsorption capacity and characterization by various techniques, the optimum Al/Cu ratio for maximum sulfur removal capacity is found to be at Al/Cu molar ratio of 0.15 which possesses the well-dispersed Cu species with high reducibility. The adsorption capacity is highest for H<SUB>2</SUB>S followed by TBM, DMS and THT. The main role of Al<SUB>2</SUB>O<SUB>3</SUB> component is to provide the dispersion of CuO species homogeneously with small particle formation and high reducibility.