In this work, we propose an algebraic recursion method to study the dynamical evolution of the two-site Bose- Hubbard model. We analyze its properties from the viewpoints of single partite purity, energy, and trace di...In this work, we propose an algebraic recursion method to study the dynamical evolution of the two-site Bose- Hubbard model. We analyze its properties from the viewpoints of single partite purity, energy, and trace distance, in which the model is considered as a typical bipartite system. The analytical expressions for the quantities are derived. We show that the purity can well reflect the transition between different regimes for the system. In addition, we demonstrate that the transition from the delocalization regime to the self-trapping regime with the ratio r/increasing not only happens for an initially local state but also for any initial states. Furthermore, we confirm that the dynamics of the system presents a periodicity for η = 0 and the period is tc =π/2J when the initial state is symmetric.展开更多
Background Phacotrabeculectomy can be performed using one-site or two-site incisions.This meta-analysis evaluated the efficacy and tolerability of one-site versus two-site phacotrabecuiectomy in the treatment of patie...Background Phacotrabeculectomy can be performed using one-site or two-site incisions.This meta-analysis evaluated the efficacy and tolerability of one-site versus two-site phacotrabecuiectomy in the treatment of patients with coexisting cataract and glaucoma.Methods A comprehensive literature search was performed according to the Cochrane Collaboration methodology toidentify randomized controlled clinical trials comparing one-site with two-site phacotrabeculectomy.Studies meeting our predefined criteria were included in the meta-analysis.Efficacy estimates were measured by weighted mean difference （WMD） for the percentage intraocular pressure （IOP） reduction from baseline to end point, relative risk （RR） for the proportion of patients with a best-corrected visual acuity （BCVA） of 0.5 or better after surgery and complete success rates.Tolerability estimates were measured by RR for adverse events.All of outcomes were reported with 95% confidence interval （95% CI）.Data were synthesised by Stata 10.1 for Windows.Results Two-site phacotrabeculectomy was associated with greater reductions in IOP than the one-site procedure （WMD： -5.99, 95% CI： -10.74-1.24, P=0.01）.A greater proportion of patients also achieved a BCVA of 0.5 or better （RR：0.91, 95% CI： 0.74-1.12, P=0.36） and the target IOP without anti-glaucoma medication at the study end point （RR： 0.94,95% CI： 0.83-1.07, P=0.34） after two-site than one-site phacotrabeculectomy, but the differences were not significant.There were no significant differences in adverse events between two surgical procedures.Conclusions Two-site phacotrabeculectomy is superior to one-site phacotrabeculectomy in reducing IOP, but other post-operative effects are similar.One-site and two-site phacotrabeculectomies have similar adverse event rates.展开更多
The abundant water resources, rainy climate and dense water network had deeply influenced the formation and development of traditional villages in the southern Hunan region of China. This paper was adopted b...The abundant water resources, rainy climate and dense water network had deeply influenced the formation and development of traditional villages in the southern Hunan region of China. This paper was adopted buffer zone analysis, categorical statistical analysis, vectorization analysis and data literature analysis, studied the shaping of traditional village site selection, plane form and internal spatial structure by water systems in southern Hunan, China, and the mechanism of their effects. The results showed that: 1) The shaping ability and mechanism of the traditional village water system in Xiangnan area on spatial morphology was mainly based on the function of the water system. 2) The layout and spatial morphology of traditional villages were deeply affected by the width, area and form of water systems in Xiangnan area. 3) Traditional villages gave more consideration to water systems with large watershed areas in site selection. 4) Water systems with small watershed areas generally had a greater impact on the internal structure of traditional villages.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.91021009 and 21073110)
文摘In this work, we propose an algebraic recursion method to study the dynamical evolution of the two-site Bose- Hubbard model. We analyze its properties from the viewpoints of single partite purity, energy, and trace distance, in which the model is considered as a typical bipartite system. The analytical expressions for the quantities are derived. We show that the purity can well reflect the transition between different regimes for the system. In addition, we demonstrate that the transition from the delocalization regime to the self-trapping regime with the ratio r/increasing not only happens for an initially local state but also for any initial states. Furthermore, we confirm that the dynamics of the system presents a periodicity for η = 0 and the period is tc =π/2J when the initial state is symmetric.
文摘Background Phacotrabeculectomy can be performed using one-site or two-site incisions.This meta-analysis evaluated the efficacy and tolerability of one-site versus two-site phacotrabecuiectomy in the treatment of patients with coexisting cataract and glaucoma.Methods A comprehensive literature search was performed according to the Cochrane Collaboration methodology toidentify randomized controlled clinical trials comparing one-site with two-site phacotrabeculectomy.Studies meeting our predefined criteria were included in the meta-analysis.Efficacy estimates were measured by weighted mean difference （WMD） for the percentage intraocular pressure （IOP） reduction from baseline to end point, relative risk （RR） for the proportion of patients with a best-corrected visual acuity （BCVA） of 0.5 or better after surgery and complete success rates.Tolerability estimates were measured by RR for adverse events.All of outcomes were reported with 95% confidence interval （95% CI）.Data were synthesised by Stata 10.1 for Windows.Results Two-site phacotrabeculectomy was associated with greater reductions in IOP than the one-site procedure （WMD： -5.99, 95% CI： -10.74-1.24, P=0.01）.A greater proportion of patients also achieved a BCVA of 0.5 or better （RR：0.91, 95% CI： 0.74-1.12, P=0.36） and the target IOP without anti-glaucoma medication at the study end point （RR： 0.94,95% CI： 0.83-1.07, P=0.34） after two-site than one-site phacotrabeculectomy, but the differences were not significant.There were no significant differences in adverse events between two surgical procedures.Conclusions Two-site phacotrabeculectomy is superior to one-site phacotrabeculectomy in reducing IOP, but other post-operative effects are similar.One-site and two-site phacotrabeculectomies have similar adverse event rates.
文摘The abundant water resources, rainy climate and dense water network had deeply influenced the formation and development of traditional villages in the southern Hunan region of China. This paper was adopted buffer zone analysis, categorical statistical analysis, vectorization analysis and data literature analysis, studied the shaping of traditional village site selection, plane form and internal spatial structure by water systems in southern Hunan, China, and the mechanism of their effects. The results showed that: 1) The shaping ability and mechanism of the traditional village water system in Xiangnan area on spatial morphology was mainly based on the function of the water system. 2) The layout and spatial morphology of traditional villages were deeply affected by the width, area and form of water systems in Xiangnan area. 3) Traditional villages gave more consideration to water systems with large watershed areas in site selection. 4) Water systems with small watershed areas generally had a greater impact on the internal structure of traditional villages.
