http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
상추 생육에 적합한 식물공장의 LED 광환경에 관한 문헌연구
심수빈, 이훈수 忠北大學校 農業科學硏究所 2008 農業科學硏究 Vol.36 No.2
Recently, there have been brisk research on plant production systems in plant factories that can???? control the environment. The development of LEDs as artificial light provides new possibilities in plant factories operation. In this paper, we will analyze the existing research on the design of LED lighting conditions that is efficient for productivity and quality enhancement of lettuce cultivated in plant factories and summarize it for optimal LED lighting conditions. The effect of different kinds of artificial lightings on the reproduction of lettuce in plant factories was investigated and the effect of RGB ratio of LEDs on the growth and quality of lettuce were investigated. LED lighting is a light developed to replace ordinary artificial lighting. It is effective in reducing power and is environmentally friendly. And it is effective as an artificial light source for plant cultivation because it can selectively use red light and blue light which are effective in plant photosynthesis. RGB Ratio of LED affect the growth and development of lettuce and its nutritional quality. The selection of light source should be considered according to the plant variety cultivated in the plant factory and the nutient to be promoted. Blue light has more effect on quality such as vitamin C than red light, but red light rather than blue light on appearance changes such as increase of body weight and leaf shape. The gene expression and nutrient accumulation of lettuce are relatively superior in mixed light than in single light. Considering the various conditions, the ratio of RGB for lettuce cultivation in a fully controlled plant production system is approximately appropriate 5~7 : 0~2 : 1~3. As a result, appropriate light sources shall be selected according to the breed of lettuce, functional material and the plant growth stages.
전기화학 수소 압축기 성능 및 기계적 특성에 대한 셀 디자인 변수의 영향 조사
심규동,이재승,윤수빈,주현철 한국유체기계학회 2024 한국유체기계학회 논문집 Vol.27 No.1
An electrochemical hydrogen compressor (EHC) is considered as promising technology for hydrogen compression. In this study, the influence of cell design variables on performance and mechanical behavior was numerically investigated for efficient and reliable operations of EHC. The distributions of stress and water concentration were examined by coupling computational fluid dynamics (CFD) and finite element method (FEM) methodology. First, the EHC model is validated against the experimental data with different Nafion membranes of N115, N117, and NR212. In general, the gas diffusion layer (GDL) intrusion toward the low-pressure side (anode) is observed induced by cell assembly and pressure gradient between the anode and cathode. While the stress level tends to be decreased with increase of the membrane, GDL thickness. Regarding the cell performance, the dehydration which i s critical i ssue for EHC operation, i s mainly a ffected by ohmic potential due to the proton transport through the membrane. In previous studies, specific causes of the anode dehydration issue and structural problems in the cell due to pressure differences in the electrochemical hydrogen compressor (EHC) were not well elucidated. Through this research, using the computational science approach, we have identified and analyzed these underlying causes and conducted simulations to assess the performance and structural stability of the cell based on various cell design factors required for design optimization and solution. Particularly, the simulations also show that when common GDL materials such as carbon paper, carbon cloth, and carbon felt are employed, breaking of GDL could not be avoided with high hydrogen compression ratio (e.g., 100), which clearly indicates that the structure strength and resistance of GDL should be improved.