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崔奉洙 충남대학교 대학원 1976 論文集 Vol.6 No.-
An apparatus for measuring resistivity of thin films was made, and the measurement of resistivity has been performed satisfactorily. The apparatus consists of placing four probes that make contact along a line on the surface of the sample. Current is passed through the outer pair of probes and the flouting potential is measured across the inner pair. The experimental results by use of this four point probe are compared with some magnetic properties. The author has identified the remarkable tendency in the experiments of measurement of resistivity, and obtained the results as follows, 1) The resistivities of nitrided iron films which were made in a low partial pressure of nitrogen gas (ie, 10^(-5)~10^(-4) Torr) shows the increasement depending upon the lattice defection 2) The resistivities of those samples which were made in a middle partial pressure of nitrogen gas (ie, 10^(-4)~10^(-3) Torr) shows almost like constant value. This result can be explain as a formation of uniform Fe-N films. 3) The resistivities of those samples which were made in a high partial pressure(ie, 10^(-3)~10^(-2) Torr) shows the increasing curve caused by the amount of impurity atoms. 4) The resistivities of samples after annealing at 400℃ decreased as a half of the original samples. This effect is thougt to originate with invasion of nitrogen atoms, which located at grain boundaries as an impurity, into the iron lattice and formation of Fe-N type compounds.
유채의 녹비 환원에 의한 질소무기화 및 옥수수의 질소 흡수
최봉수,홍기찬,성좌경,남재작,임정은,이현용,양재의,옥용식,Choi, Bong-Su,Hong, Ki-Chan,Sung, Jwa-Kyung,Nam, Jae-Jak,Lim, Jung-Eun,Lee, Hyeon-Yong,Yang, Jae-E.,Ok, Yong-Sik 한국유기농업학회 2009 韓國有機農業學會誌 Vol.17 No.3
녹비 작물의 이용은 화학비료의 사용을 대체하고 물질순환에 의한 안전한 농작물 생산을 가능하게 할 수 있다. 이에 본 연구는 바이오디젤 생산의 원료로 이용되는 유채 종자의 유채의 녹비 환원에 의한 질소무기화 및 옥수수의 질소 흡수 389 수확 후 잔유물의 녹비 이용 가능성을 평가하였다. 유채 수확 후 잔류물의 질소함량은 0.53%로 낮았으며 탄질율은 63으로 나타났다. 유채 잔유물의 부숙기간 없이 환원 직후 파종한 처리구는 옥수수의 질소 흡수를 지연시켰으며, 생육에서도 30일간 부숙기간을 설정한 처리구의 옥수수보다 억제되어 유채 잔유물의 녹비 환원 직후 후작물의 파종은 주의해야 할 것으로 판단되었다. 유채 잔유물의 녹비 환원 90일 후 질소무기화는 암모늄태 질소(24.2mg/kg)보다 질산태 질소(58.4mg/kg)에서 높았으며, 방출된 무기태 질소에 대한 옥수수의 흡수 및 이용량은 부숙기간 없이 환원 직후 파종한 처리구와 30일간 부숙기간을 설정한 처리구에서 각각 86%와 88%로 나타났다. Crop production can be secured by the cycle of green manure crops as an alternative of the chemical fertilizer. Recently, rapeseed (Brassica napus L.) has been cultivated in the south part of Korea for the production of biodiesel. In this research, we focused on recycling rapeseed residue, which is produced after harvesting the rapeseed for biodiesel, as a potential source of nitrogen to the succeeding crop. Pot experiment was conducted to evaluate the effects of winter rapeseed as green manure on mineralization and uptake of nitrogen to the succeeding corn (Zea mays L.). Result showed that total nitrogen and C/N ratio of rapeseed at the harvesting stage was 0.54% and 63, respectively. The incorporation of rapeseed without decomposition period slightly inhibited nitrogen uptake to the succeeding corn compared to those with 30 days decomposition period. The pH and EC values of soils increased by increasing the period of decomposition of rapeseed from 5.2 to 6.4 and from 0.05 dS/m to 0.21 dS/m, respectively. Significant amounts of $NH_4^+$ and $NO_3^-$ are released by incorporation of rapeseed. The succeeding corn took up 86% and 88% of inorganic nitrogen released from the rapeseed with and without decomposition period, respectively. The overall results suggested that the utilization of rapeseed residue as green manure can be an alternative source of nitrogen in corn-rapeseed double cropping system.