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Zeolite에 의(依)한 $NH_4{^+}$의 흡착(吸着)
김상수,허남호,장상문,최정,Kim, Sang Su,Hur, Nam Ho,Chang, Sang Moon,Choi, Jyung 경북대학교 농업과학기술연구소 1990 慶北大農學誌 Vol.8 No.-
Zeolite에 의(依)한 $NH_4{^+}$의 흡착반응(吸着反應)에 영향(影響)을 미치는 열처리(熱處理)에 의(依)해 조사(調査)하고 배양실험(培養實驗)을 통하여 Zeolite에 흡착(吸着)된 $NH_4{^+}$의 소실량(消失量)을 조사(調査)하였다. Zeolite의 주구성점토광물(主構成粘土鑛物) Clinoptiolite와 mordenite였다. Zeolite에 의(依)한 $NH_4{^+}$의 흡착반응(吸着反應)은 4시간(時間) 진탕으로 흡착평형(吸着平衡)에 도달(到達)하였다. 열처리온도(熱處理溫度)가 높을수록 치환성(置換性) $K^+$의 합량(合量)은 증가(增加)하였으나 $NH_4{^+}$의 흡착량(吸着量)은 감소(減少)하였다. 유안(硫安)을 처리(處理)한 토양(土壤)을 담수상태(湛水狀態)에서 배양(培養)한 결과(結果) 시간(時間)이 경과(經過)할수록 토양중(土壤中) $NH_4{^+}$ 잔류량(殘留量)이 감소(減少)한 반면(盤面) Zeolite에 흡착(吸着)된 $NH_4{^+}$는 동일기간(同一期間) 내(內)에 소실(消失)되지 않았다. 그러므로 Zeolite에 흡착(吸着)된 $NH_4{^+}$은 여러 가지 작용(作用)에 의(依)한 소실(消失)에 대(對)해 저항성(抵抗性)이 크다고 할 수 있다. This study was conducted to examine the influence of heat treatment on the $NH_4{^+}$ adsorption by zeolite and to determine the $NH_4{^+}$ loss from $NH_4-$ zeolite during the incubation. The dominant clay minerals of zeolite were clinoptiloiite and mordenite. $NH_4{^+}$ adsorption by zeolite was equilibrated at a 4hrs-shaking. The content of exchangeable $K^+$ of zeolite was increased with increase in the temperature of heat treatment but the amount of $NH_4{^+}$ adsorbed by zeolite was decreased. The amount of $NH_4{^+}$ in the soil treated with ammonium sulfate was decreased during incubation under the submerged condition but the amount of $NH_4{^+}$ adsorbed by zeolite was not decreased in the same course of incubation. It was estimated that $NH_4{^+}$ adsorbed by zeolite was resistant to $NH_4{^+}$-N loss by various reactions.
남부 산간고랭지에서 쌀 품질 향상을 위한 적정 질소시비량
김상수,최원영,남정권,이준희,백남현,박홍규,최민규,김정곤,Kim, Sang-Su,Choi, Weon-Young,Nam, Jeong-Kwon,Lee, Jun-Hee,Back, Nam-Hyun,Park, Hong-Kyu,Choi, Min-Kyu,Kim, Chung-Kon 한국작물학회 2006 Korean journal of crop science Vol.51 No.suppl1
남부 산간고랭지에서 고품질 쌀 생산을 위한 질소시비량을 구명하고자 $2002{\sim}2004$년에 남부 산간고랭지 인 운봉에서 삼천벼를 공시하여 질소시비량에 따른 생육, 수량구성요소, 쌀 수량 및 품질 관련형질을 조사한 결과를 요약하면 다음과 같다. 1. 단위면적당 수수와 입수는 다비할수록 많았으나, 등숙비율과 현미천립중은 다비할수록 저하되었다. 2. 백미 외관상 품위에서 완전립 비율은 질소시비량이 많을수록 낮았고, 아밀로스 함량은 질소시비량 간에 별 차이가 없었으나, 단백질 함량은 질소시비량이 증가됨에 따라 다소 높아지는 경향이었다. 3. 쌀 수량과 완전미 수량은 질소 9 kg/10a 수준까지는 증수 되었으나 그 이상의 질소시비량에서는 수량 차이가 인정되지 않았다. 4. 따라서 남부 산간고랭지에서 완전미 수량, 완전미비율, 미질, 등숙비율 등을 고려한 품질향상을 위한 적정 질소시비량은 10a당 9 kg 내외로 판단된다. The effect of N-fertilization on yield, milling characteristics and quality of Samcheonbyeo, an early maturing rice variety, was investigated in 2002 to 2004. The study was carried out in the southern alpine area of Un-bong Sub-Station, Honam Agricultural Research Institute. Higher nitrogen levels increased number of panicle and grain per unit area, but lowed ripening rate and decreased 1,000-grain weight. Higher nitrogen levels of up to 90 kg/ha also increased head rice yield. A nitrogen level of 90 kg/ha was found optimal for increasing ripening rate and head rice yield, and rice palatability.
졸-겔 법으로 성장시킨 Nb가 첨가된 Bi<sub>4</sub>Ti<sub>3</sub>O<sub>12</sub> 박막의 미세구조와 전기적 성질
김상수,장기완,한창희,이호섭,김원정,최은경,박문흠,Kim, Sang-Su,Jang, Ki-Wan,Han, Chang-Hee,Lee, Ho-Sueb,Kim, Won-Jeong,Choi, Eun-Kyung,Park, Mun-Heum 한국재료학회 2003 한국재료학회지 Vol.13 No.5
Bismuth layered structure ferroelectric thin films, $Bi_4$$Ti_3$$O_{12}$ / (BTO) and Nb-doped BTO (BTN) were prepared on the Pt(111)/Ti/$SiO_2$/Si(100) substrates by a sol-gel route. We investigated the Nb-doping effect on the grain orientation and ferroelectric properties. $Nb^{5+}$ ion substitution for $Ti^{4+}$ ion in perovskite layers of BTO decreased the degree of c-axis orientation and increased the remanent polarization (2Pr). The fatigue resistance of Nb-doped BTO thin film was shown to be superior to that of BTO, and the leakage current of Nb-doped BTO thin film was decreased about 1 order of magnitude compared with BTO. The improvement of ferroelectric properties with $Nb^{5+}$ doping in BTO could be attributed to the changes in space charge densities and grain orientation in the thin film.
김상수,배우석,이종규,Kim, Sang-Su,Bae, Woo-Seok,Lee, Jong-Kyu (사)한국토질및기초기술사회 2006 기술발표회 Vol.2006 No.-
Segmental Grid Retaining Wall is one of the segmental grid retaining walls using headers and stretchers to establish the framework of the wall In this method, grids formed by the intersection of headers and stretchers are generally filled with the gravel to maintain the weight of the wall Therefore, the construction can be carried out with higher speed and much economically when compared with the concrete retaining wall Furthermore, it has high drain capacity, and environmentally friendly aspects also have been pointed out because the possibility of the planting at the front of the wall However, in the segmental grid retaining wall method, the relative movement between the individual headers and stretchers was generally recognized, and stress redistribution in the gravel filling was also observed when subjected to the external loading and self-weight of filling Therefore, it has been thought that the distribution of the earth pressure in the segmental grid retaining wall system differ from that of the concrete retaining wall In this study, the surcharge tests using the scaled model segmental grid retaining wall was carried out to observe the distribution of the earth pressure in the segmental grid retaining wall The earth pressure was measured in the six specified height of wall, and the distribution of the pressure was analyzed. Furthermore, the earth pressure by computation or by the test using the concrete retaining wall was also considered to make comparison