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Influence of FeSe doping on superconducting properties of MgB2 by hybrid microwave method
Cheng Cheng,Zhenjie Feng,Qing Li,Xu Wang,Chuan Yu,Hao Chu,Ya Yang,Changqin Liu,Yiming Cao,Zhe Li,Jingzhe Chen,Chao Jing,Shixun Cao,Jincang Zhang 한국물리학회 2017 Current Applied Physics Vol.17 No.11
The effect of FeSe doping on the physical properties of MgB2 is studied. Bulk samples of the FeSe doped MgB2 with weight ratio x ðFeSe : MgB2Þ ¼ 0%; 3%; 7% and 10% were prepared by hybrid microwave method. It is proved that FeSe is not stable together with MgB2. Fe2þ enters into MgB2 lattice, some Mg2þ and Se2『 are combined into the new impurity compound MgSe. The superconducting transition temperature (Tc) slightly decreased with increasing doping content of FeSe from R-T and M-T curves, which results from the substitution of Mg2þ by Fe2þ in the MgB2 lattice. The Jc increase slightly with the FeSe doping content increasing from 3 wt % to 10 wt %, which results from the increasing MgSe impurity pinning centers.
폐양액을 이용한 관비재배가 머스크 멜론과 오이의 생육에 미치는 영향
장성호(Cheng Hao Zhang),강호민(Ho-Min Kang),김일섭(Il Seop Kim) (사)한국생물환경조절학회 2006 시설원예‧식물공장 Vol.15 No.4
생육시기별 멜론의 비순환식 수경재배 폐양액은 NO₃-N와 Ca 및 K 함량 등 양이온 함량이 높았고, 반대로 음이온은 약간 감소하는 경향을 보였다. pH는 5.7~7.0 사이를 유지하였고, EC는 멜론은 2.0~2.2 dSㆍm?¹ 시아를 유지하였다. 폐양액을 이용한 관비재배에서 멜론 식물의 초장, 근장, 그리고 엽록소 함량이 관비재배에서 증가하였다., 또한 과중도 417.1g 더 무거웠으며 과질의 ˚Brix당도는 관비재배가 13.3˚Brix로 1.4˚Brix 더 높았다. 오이에서는 오이식물의 생육에는 차이를 보이지 않았으며 과실의 크기도 유의성 있는 차이는 없었으나 관비재배가 수경재배에 비하여 총수량과 상품과율에서 우수하였다. Waste nutrient solution(WNS) using non-recycled hydroponics for melon increased contents of NO₃-N and cataions, such as, Ca, K, while anions except NO₃-N were decreased slightly as the musk melon plants grew. pH and EC of WNS were maintained 5.7~7.0, 2.0~2.2 dSㆍm?¹, respectively. The musk melon plants cultivated by fertigation using WNS showed longer plant height and root length, and higher chlorophyll content than that grown by hydroponics. The fruit weight of musk melon grown by fertigation using WNS were 417.1 g heavier than that cultivated by hydroponics and soluble solids contents of musk melon fruit cultivated by fertigation using WNS was 13.3˚Brix, that was 1.4˚Brix higher than that grown by hydro-ponies. While the growth of cucumber plants and size of cucumber fruits were not different between in fertigation using WNS and hydroponics, total yields and marketable fruit percentage showed more in fertigation using WNS than in hydroponics.