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이귀현 ( Gwi Hyun Lee ),강화석 ( Whoa Seung Kang ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2009 강원 농업생명환경연구 Vol.21 No.-
Lotus are usually cultivated in the slime soil of paddy field in Korea. Cultivation area of lotus roots as an alternative of a rice plant has been increased greatly during several years due to the decrease of rice price. Lotus roots are grown horizontally in the depth of about 30 cm inside the slim soil. Lotus roots are used as the health food. The harvesting of lotus roots requires the great labor and is usually done by manual labor as digging with hoe. The objective of this study was to develope the lotus root harvester for providing the convenience on harvesting of lotus roots by soil breaking with injecting air of high pressure into the soil. The constructed harvester of lotus roots was composed of the main body with two air cylinders, two sliding plates, and an instrument for air ejection including nozzle, high pressure container, handle, and lever.
이귀현 ( Gwi Hyun Lee ),김대현 ( Dae Hyun Kim ),김성진 ( Sung Jin Kim ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2009 강원 농업생명환경연구 Vol.21 No.-
This study was carried out to analyze the performance of solar collecting system using the parabolic trough concentrator (PTC) depending on the elements affecting on the system efficiency. The material of solar absorbing tube, an amount of flow rate circulating the solar collecting system, and installation of polycarbonate tube (PC) outside solar absorbing tube were selected as the elements affecting on the efficiency of the PTC solar system. The stainless steel tube as solar absorbing tube presented the most effective performance of solar collecting system in comparing with galvanized tube and copper tube. Flow rate of 18ℓ/min circulating inside the solar absorbing tube of PTC solar system showed the better performance than flow rates of 9ℓ/min and 13.5ℓ /min. The installation of PC (Polycarbonate) tube outside the solar absorbing tube had great effects on the performance of the PTC solar system.