Fe 100- x Ni x alloys of ultrafine particle with the average grain size of about 10 nm were synthesized by mechanically alloying process. The samples were investigated by X ray diffraction and measure...Fe 100- x Ni x alloys of ultrafine particle with the average grain size of about 10 nm were synthesized by mechanically alloying process. The samples were investigated by X ray diffraction and measurements of the saturation magnetization and coercivity force. Both b.c.c and f.c.c phase exist within a wide range for Fe 100- x Ni x , while x ≤45. The effective magnetic anisotropy K e was measured by applying the law of approach to saturation. The value of K e decreases with an increase of Ni content. It is noticed that the strain anisotropy makes a large contribution to the magnetic anisotropy. The estimation of grain size leads to the determination of the single domain critical size and domain wall energy. The exchange stiffness and exchange integral deduced from the relationship between the effective magnetic anisotropy and domain wall energy are in agreement with that calculated by other methods.展开更多
Background：The aim of this research was to investigate the changes in the vision-related resting-state network （V-RSN） in pituitary adenoma （PA） patients after vision improvement,which was induced by operative tr...Background：The aim of this research was to investigate the changes in the vision-related resting-state network （V-RSN） in pituitary adenoma （PA） patients after vision improvement,which was induced by operative treatment.Methods：Ten PA patients with an improved visual acuity or/and visual field after transsphenoidal pituitary tumor resection were recruited and underwent a complete neuro-ophthalmologic evaluation,as well as an magnetic resonance imaging （MRI） protocol,including structural and resting-state functional MRI sequences before and after the operation.The regional homogeneity （ReHo） of the V-RSN was evaluated.Two sample t-test was performed to identify the significant differences in the V-RSN in the PA patients before and after transsphenoidal pituitary tumor resection.Results：Compared with the preoperation counterparts,the PA patients with improved vision after the operation exhibited reduced ReHo in the bilateral thalamus,globus pallidus,caudate nucleus,putamen nucleus,supplementary motor area,and left hippocampal formation,and increased ReHo in the bilateral cuneus gyrus,calcarine gyrus,right lingual gyrus,and fusiform gyrus.Conclusions：PA patients with improved vision exhibit increased neural activity within the visual cortex,but decreased neural activity in subareas of the multisensory and multimodal systems beyond the vision cortex.展开更多
文摘Fe 100- x Ni x alloys of ultrafine particle with the average grain size of about 10 nm were synthesized by mechanically alloying process. The samples were investigated by X ray diffraction and measurements of the saturation magnetization and coercivity force. Both b.c.c and f.c.c phase exist within a wide range for Fe 100- x Ni x , while x ≤45. The effective magnetic anisotropy K e was measured by applying the law of approach to saturation. The value of K e decreases with an increase of Ni content. It is noticed that the strain anisotropy makes a large contribution to the magnetic anisotropy. The estimation of grain size leads to the determination of the single domain critical size and domain wall energy. The exchange stiffness and exchange integral deduced from the relationship between the effective magnetic anisotropy and domain wall energy are in agreement with that calculated by other methods.
文摘Background：The aim of this research was to investigate the changes in the vision-related resting-state network （V-RSN） in pituitary adenoma （PA） patients after vision improvement,which was induced by operative treatment.Methods：Ten PA patients with an improved visual acuity or/and visual field after transsphenoidal pituitary tumor resection were recruited and underwent a complete neuro-ophthalmologic evaluation,as well as an magnetic resonance imaging （MRI） protocol,including structural and resting-state functional MRI sequences before and after the operation.The regional homogeneity （ReHo） of the V-RSN was evaluated.Two sample t-test was performed to identify the significant differences in the V-RSN in the PA patients before and after transsphenoidal pituitary tumor resection.Results：Compared with the preoperation counterparts,the PA patients with improved vision after the operation exhibited reduced ReHo in the bilateral thalamus,globus pallidus,caudate nucleus,putamen nucleus,supplementary motor area,and left hippocampal formation,and increased ReHo in the bilateral cuneus gyrus,calcarine gyrus,right lingual gyrus,and fusiform gyrus.Conclusions：PA patients with improved vision exhibit increased neural activity within the visual cortex,but decreased neural activity in subareas of the multisensory and multimodal systems beyond the vision cortex.
