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RISS 인기검색어
- 검색키워드
- 저자 : Binghai Liu (검색결과 3 건)
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Magnetic Anisotropies in Cobalt-Nickel Ferrites (NixCo1-xFe2O4)
Binghai Liu,Jun Ding,Jiabao Yi,Jianhua Yin,Zhili Dong 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
This work presents a detailed study on the various magnetic anisotropies of NixCo1..xFe2O4 prepared by using a mechanochemical process. The results indicated that the magnetic anisotropy of NixCo1..xFe2O4 was strongly correlated with the Co2+ concentration. The Ni2+ substitution readily led to a decrease in the magnetocrystalline anisotropy and coercivity. While a large uniaxial anisotropy was induced in CoFe2O4 by magneto-annealing, the uniaxial anisotropy decreased with the Ni concentration in NixCo1..xFe2O4 and disappeared in the pure NiFe2O4. A short-time mechanical milling was found to signicantly increase the coercivity in NixCo1..xFe2O4 samples and high coercivities of 5.1 kOe and 2.8 kOe were achieved in the CoFe2O4 and the Ni0:5Co0:5Fe2O4 samples respectively. The microstructure and magnetic studies indicated that the milling-induced high coercivity could be ascribed to milling-induced stress anisotropy and to the pinning eects of defects. This work presents a detailed study on the various magnetic anisotropies of NixCo1..xFe2O4 prepared by using a mechanochemical process. The results indicated that the magnetic anisotropy of NixCo1..xFe2O4 was strongly correlated with the Co2+ concentration. The Ni2+ substitution readily led to a decrease in the magnetocrystalline anisotropy and coercivity. While a large uniaxial anisotropy was induced in CoFe2O4 by magneto-annealing, the uniaxial anisotropy decreased with the Ni concentration in NixCo1..xFe2O4 and disappeared in the pure NiFe2O4. A short-time mechanical milling was found to signicantly increase the coercivity in NixCo1..xFe2O4 samples and high coercivities of 5.1 kOe and 2.8 kOe were achieved in the CoFe2O4 and the Ni0:5Co0:5Fe2O4 samples respectively. The microstructure and magnetic studies indicated that the milling-induced high coercivity could be ascribed to milling-induced stress anisotropy and to the pinning eects of defects.
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Chen Mingna,Zhang Jiancheng,Liu Hu,Wang Mian,Pan LiJuan,Chen Na,Wang Tong,Jing Yu,Chi Xiaoyuan,Du Binghai 한국미생물학회 2020 The journal of microbiology Vol.58 No.7
Balancing soil microbial diversity and abundance is critical to sustaining soil health, and understanding the dynamics of soil microbes in a monocropping system can help determine how continuous monocropping practices induce soil sickness mediated by microorganisms. This study used previously constructed gradient continuous monocropping plots and four varieties with different monocropping responses were investigated. The feedback responses of their soil fungal communities to short-term and long-term continuous monocropping were tracked using high-throughput sequencing techniques. The analyses indicated that soil samples from 1 and 2 year monocropped plots were grouped into one class, and samples from the 11 and 12 year plots were grouped into another, regardless of variety. At the species level, the F. solani, Fusarium oxysporum, Neocosmospora striata, Acrophialophora levis, Aspergillus niger, Aspergillus corrugatus, Thielavia hyrcaniae, Emericellopsis minima, and Scedosporium aurantiacum taxa showed significantly increased abundances in the long-term monocropping libraries compared to the short-term cropping libraries. In contrast, Talaromyces flavus, Talaromyces purpureogenus, Mortierella alpina, Paranamyces uniporus, and Volutella citrinella decreased in the long-term monocropping libraries compared to the shortterm libraries. This study, combined with our previous study, showed that fungal community structure was significantly affected by the length of the monocropping period, but peanut variety and growth stages were less important. The increase in pathogen abundances and the decrease in beneficial fungi abundances seem to be the main cause for the yield decline and poor growth of long-term monocultured peanut. Simplification of fungal community diversity could also contribute to peanut soil sickness under long-term monocropping. Additionally, the different responses of peanut varieties to monocropping may be related to variations in their microbial community structure.
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