The structure and magnetic properties of Ce 2Co 17-xM x(M=Ga,Al and Si) compounds for M concentrations up to x=5 were studied by means of X-ray diffraction and magnetic measurements. The experimental results show...The structure and magnetic properties of Ce 2Co 17-xM x(M=Ga,Al and Si) compounds for M concentrations up to x=5 were studied by means of X-ray diffraction and magnetic measurements. The experimental results show that the Curie temperatures and Co spontaneous magnetization decrease significantly with increasing the addition of non-magnetic substitutional atoms, and that Si which has a minimum solid solubility in Ce 2Co 17 causes a largest reduction of Curie temperature, spontaneous magnetization and moment per Co atom compared with Ga and Al.展开更多
The temperature dependent magnetization of the (Ce,Nd) 2(Fe,Si,Mn) 17 intermetallic compounds were measured and analyzed by molecular field theory (MFT). The relationship between T C and the intrasublattic...The temperature dependent magnetization of the (Ce,Nd) 2(Fe,Si,Mn) 17 intermetallic compounds were measured and analyzed by molecular field theory (MFT). The relationship between T C and the intrasublattice coupling interactions was discussed. The two sublattice MFT model can well describe the temperature dependence of the magnetization for all the compounds investigated. Ce ion in (Ce,Nd) 2Fe 17 compounds does not simply dilute the magnetic structure, but is likely present in a mixed valence state. The substitution of Si for Fe strongly raises T C and the mean Fe moment remains unchanged for Ce 2(Si,Fe) 17 compounds, and the 3d exchange coupling constant J FF increases linearly. Mn decreases T C of Nd 2(Mn, Fe) 17 compound by reducing J FF .展开更多
类风湿关节炎(rheumatoid arthritis,RA)是全身性、持续性、自身免疫性疾病,其病理机制涉及多种免疫细胞,尤其是T淋巴细胞。辅助性T细胞17(relper T cell 17,Th17)和调节性T细胞(regulatory T cell,Treg)是构成免疫系统的关键元素,在维...类风湿关节炎(rheumatoid arthritis,RA)是全身性、持续性、自身免疫性疾病,其病理机制涉及多种免疫细胞,尤其是T淋巴细胞。辅助性T细胞17(relper T cell 17,Th17)和调节性T细胞(regulatory T cell,Treg)是构成免疫系统的关键元素,在维持免疫稳态方面起着重要的作用。对单味中药及其有效成分、中药复方、中成药基于Th17/Treg平衡治疗RA的研究进展进行概括,为RA的临床治疗提供理论指导,为了解RA的发病机制提供新的思路。展开更多
文摘The structure and magnetic properties of Ce 2Co 17-xM x(M=Ga,Al and Si) compounds for M concentrations up to x=5 were studied by means of X-ray diffraction and magnetic measurements. The experimental results show that the Curie temperatures and Co spontaneous magnetization decrease significantly with increasing the addition of non-magnetic substitutional atoms, and that Si which has a minimum solid solubility in Ce 2Co 17 causes a largest reduction of Curie temperature, spontaneous magnetization and moment per Co atom compared with Ga and Al.
文摘The temperature dependent magnetization of the (Ce,Nd) 2(Fe,Si,Mn) 17 intermetallic compounds were measured and analyzed by molecular field theory (MFT). The relationship between T C and the intrasublattice coupling interactions was discussed. The two sublattice MFT model can well describe the temperature dependence of the magnetization for all the compounds investigated. Ce ion in (Ce,Nd) 2Fe 17 compounds does not simply dilute the magnetic structure, but is likely present in a mixed valence state. The substitution of Si for Fe strongly raises T C and the mean Fe moment remains unchanged for Ce 2(Si,Fe) 17 compounds, and the 3d exchange coupling constant J FF increases linearly. Mn decreases T C of Nd 2(Mn, Fe) 17 compound by reducing J FF .
文摘类风湿关节炎(rheumatoid arthritis,RA)是全身性、持续性、自身免疫性疾病,其病理机制涉及多种免疫细胞,尤其是T淋巴细胞。辅助性T细胞17(relper T cell 17,Th17)和调节性T细胞(regulatory T cell,Treg)是构成免疫系统的关键元素,在维持免疫稳态方面起着重要的作用。对单味中药及其有效成分、中药复方、中成药基于Th17/Treg平衡治疗RA的研究进展进行概括,为RA的临床治疗提供理论指导,为了解RA的发病机制提供新的思路。
