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영양염류 농도에 따른 부레옥잠(Water hyacinth)의 성장특성에 관한 연구
전만식,김범철 江原大學校 附設 環境硏究所 1994 環境硏究 Vol.11 No.-
The growth rate and the nutrients removal efficiency of water hyacinth in artificial medium were studied. Water hyacinth showed maximum growth rate at the density of 5-18㎏ wet wt./m^(2), when the yield was 0.67-1.23㎏ wet wt./m^(2)/day. The removal rate of phosphorus and nitrogen was 153 and 1,184㎎/m^(2)/day, respectively. Growth rate significantly decreased at low nutrients concentration below 0.8㎎P/ℓ and 3.1㎎N/ℓ. The maximum specific growth rate(μ_(max)) of water hyacinth was 0.101day^(-1) and half saturation concentration(Ks) was 0.032㎎P/ℓ and 0.410㎎N/ℓ for phosphorus and nitrogen, respectively. The shoot/root weight ratio, varying from 1.8 to 14.1, was smaller at low nutrient concentration due to the enhanced development of root. The contents of phosphorus and nitrogen in the dried tissue were 0.22-1.02% and 1.4-4.3%, respectively. The water content was 88.9-93.9%. The removal efficiencies of P and N were 90% and 71% when retention time was 5.7day, and the standing crop was 3.8㎏/m^(2).
Frequency Swept Laser at 1300 nm Using a Wavelength Scanning Filter Based on a Rotating Slit Disk
전만식,정운상,송재원,김지현,오정환,엄진섭,김창석,박영호 한국광학회 2009 Current Optics and Photonics Vol.13 No.3
A simple and compact frequency swept laser is demonstrated at 1.3 μm using a wavelength scanning filter based on a rotating slit disk. The laser is comprised of a pigtailed semiconductor optical amplifier, a circulator, and a wavelength scanning filter in an extended cavity configuration. The wavelength scanning filter is composed of a collimator, a diffraction grating, a rotating slit disk, and a mirror. The instantaneous laser output power is more than 5 mW. The scanning range of the laser is extended to 80 nm at the maximum level, and 55 nm in the full width at half maximum at a scanning rate of 2 kHz.