The crystal and electronic structure of the Eu^2＋ doped and defect containing Sr2MgSi2O7 persistent luminescence material were studied using the density functional theory （DFT）. The defects may act as energy storag...The crystal and electronic structure of the Eu^2＋ doped and defect containing Sr2MgSi2O7 persistent luminescence material were studied using the density functional theory （DFT）. The defects may act as energy storage or even luminescence quenching centres in these materials, however their role is very difficult to confirm experimentally. The probability of vacancy formation was studied using the total energy of the defect containing host. Significant structural modifications in the environment of the isolated defects, especially the strontium vacancy, as well as defect aggregates were found. The experimental band gap energy of Sr2MgSi2O7 was well reproduced by the calculations. The defect induced electron traps close to the host＇s conduction band were found to act as energy storage sites contributing to its efficient persistent luminescence. The interactions between the defects were found to modify both the Eu^2＋ 4f^7 ground state energy as well as the trap structure. The effect of charge compensation induced by the rare earth co-doping on the defect structure and energy storage properties of the persistent luminescence materials was discussed.展开更多
Objective: To explore the effect and pharmacological mechanism of Xiaoyu Zhixue Tablet (XZT). Methods: XZT mainly composed of Chinese medical herbs to replenish Qi and remove stasis was used to treat patients with idi...Objective: To explore the effect and pharmacological mechanism of Xiaoyu Zhixue Tablet (XZT). Methods: XZT mainly composed of Chinese medical herbs to replenish Qi and remove stasis was used to treat patients with idiopathic multifocal bleeding and platelet aggregation defect. Patients were divided into 2 groups, the TCM group (104 cases) treated with XZT, and the control group (84 cases) with vitamin C, K and P, adrenosin and/or artificial menstruation, for at least 4 months. Results: The hemostatic effective rate was 92. 3 % in the TCM group and 27. 4 % in the control group (P < 0. 005), the recovery rate of platelet aggregation after 6 months' therapy was 69. 2 % and only 1. 8% respectively. The difference between the two groups was very significant (P < 0. 005). Conclusion: XZT could regulate the hemostatic action and platelet aggregation展开更多
基金Project supported by Turku University FoundationJenny and Antti Wihuri Foundation (Finland)+2 种基金the Academy of Finland (contract #117057/2006,#134459/2010)research mobility agreements (112816/2006/JH,116142/2006/JH,123976/2007/TL) between the Academy of Finland and the Academy of Sciences of the Czech Republicthe Czech research project (AVOZ10100521 (PN))
文摘The crystal and electronic structure of the Eu^2＋ doped and defect containing Sr2MgSi2O7 persistent luminescence material were studied using the density functional theory （DFT）. The defects may act as energy storage or even luminescence quenching centres in these materials, however their role is very difficult to confirm experimentally. The probability of vacancy formation was studied using the total energy of the defect containing host. Significant structural modifications in the environment of the isolated defects, especially the strontium vacancy, as well as defect aggregates were found. The experimental band gap energy of Sr2MgSi2O7 was well reproduced by the calculations. The defect induced electron traps close to the host＇s conduction band were found to act as energy storage sites contributing to its efficient persistent luminescence. The interactions between the defects were found to modify both the Eu^2＋ 4f^7 ground state energy as well as the trap structure. The effect of charge compensation induced by the rare earth co-doping on the defect structure and energy storage properties of the persistent luminescence materials was discussed.
文摘Objective: To explore the effect and pharmacological mechanism of Xiaoyu Zhixue Tablet (XZT). Methods: XZT mainly composed of Chinese medical herbs to replenish Qi and remove stasis was used to treat patients with idiopathic multifocal bleeding and platelet aggregation defect. Patients were divided into 2 groups, the TCM group (104 cases) treated with XZT, and the control group (84 cases) with vitamin C, K and P, adrenosin and/or artificial menstruation, for at least 4 months. Results: The hemostatic effective rate was 92. 3 % in the TCM group and 27. 4 % in the control group (P < 0. 005), the recovery rate of platelet aggregation after 6 months' therapy was 69. 2 % and only 1. 8% respectively. The difference between the two groups was very significant (P < 0. 005). Conclusion: XZT could regulate the hemostatic action and platelet aggregation
