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- 저자 : Zhu Xiufang (검색결과 2 건)
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Xiufang Zhu,Qin Zhong,Han Yan,Xuejun Zhao,Wenyi Tan 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.8
Perovskite-type Ce_(0.9)Sr_(0.1)Cr_(0.5)Mn_(0.5)O_(3-δ) (CSCMn) was synthesized and evaluated as anode for solid oxygen fuel cells based on Ce_(0.8)Sm_(0.2)O_(1.9) (SDC). The conductivities of CSCMn were evaluated with DC four-probe method in 3% H_2-N_2 and 5% H_2S-N_2 at 450-700 ℃, respectively. The compositions of CSCMn powders were studied by XRD and thermodynamic calculations. Meanwhile, sintering temperatures affecting phases of CSCMn is also proposed with XRD, and the analysis is given with thermodynamic calculations. CSCMn exhibits good chemical compatibility with electrolyte (SDC) in N_2. After exposure to 5% H_2S-N_2 for 5 h at 800 ℃, CSCMn crystal structures change and some sulfides are detected, as evidenced by XRD and Raman analyses. The electrochemical properties are measured for the cell comprising CSCMn- SDC/SDC/Ag in 5% H_2S-N_2 at 600 ℃ and in 3% H_2-N_2 at 450 and 500 ℃. The electrochemical impedance spectrum (EIS) is used to analyze ohm and polarization resistance of the cell at various temperatures.
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Quantitative Susceptibility Mapping of Brain Iron Deposition in Patients With Recurrent Depression
Duan Xinxiu,Xie Yuhang,Zhu Xiufang,Chen Lei,Li Feng,Feng Guoquan,Li Lei 대한신경정신의학회 2022 PSYCHIATRY INVESTIGATION Vol.19 No.8
Objective Recurrence is the most significant feature of depression and the relationship between iron and recurrent depression is still lack of direct evidence in vivo.Methods Twenty-one patients with depression and twenty control subjects were included. Gradient-recalled echo, T1 and T2 images were acquired using a 3.0T MRI system. After quantitative susceptibility mapping were reconstructed and standardized, a whole-brain and the regions of interest were respectively analyzed.Results Significant increases in susceptibility were found in multiple recurrent depression patients, which involved several brain regions (frontal lobes, temporal lobe structures, occipital lobes hippocampal regions, putamen, thalamus, cingulum, and cerebellum). Interestingly, no susceptibility changes after treatment compared to pre-treatment (all p>0.05) and no significant correlation between susceptibility and Hamilton Depression Rating Scale were found. Besides, it was close to significance that those with a higher relapse frequency or a longer mean duration of single episode had a higher susceptibility in the putamen, thalamus, and hippocampus. Further studies showed susceptibility across the putamen (ρ<sup>2</sup>=0.27, p<0.001), thalamus (ρ<sup>2</sup>=0.21, p<0.001), and hippocampus (ρ<sup>2</sup>=0.19, p<0.001) were strongly correlated with total course of disease onset.Conclusion Brain iron deposition is related to the total course of disease onset, but not the severity of depression, which suggest that brain iron deposition may be a sign of brain damage in multiple recurrent depression.
KCI
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