To further investigate the one-dimensional(1D)rheological consolidation mechanism of double-layered soil,the fractional derivative Merchant model(FDMM)and the non-Darcian flow model with the non-Newtonian index are re...To further investigate the one-dimensional(1D)rheological consolidation mechanism of double-layered soil,the fractional derivative Merchant model(FDMM)and the non-Darcian flow model with the non-Newtonian index are respectively introduced to describe the deformation of viscoelastic soil and the flow of pore water in the process of consolidation.Accordingly,an 1D rheological consolidation equation of double-layered soil is obtained,and its numerical analysis is performed by the implicit finite difference method.In order to verify its validity,the numerical solutions by the present method for some simplified cases are compared with the results in the related literature.Then,the influence of the revelent parameters on the rheological consolidation of double-layered soil are investigated.Numerical results indicate that the parameters of non-Darcian flow and FDMM of the first soil layer greatly influence the consolidation rate of double-layered soil.As the decrease of relative compressibility or the increase of relative permeability between the lower soil and the upper soil,the dissipation rate of excess pore water pressure and the settlement rate of the ground will be accelerated.Increasing the relative thickness of soil layer with high permeability or low compressibility will also accelerate the consolidation rate of double-layered soil.展开更多
目的系统分析口腔扁平苔藓与糖尿病的关联。方法检索中国知网、维普、万方数据库、中国生物医学文献服务系统及PubMed、Web of Science、EMBASE、Cochrane Library数据库中关于口腔扁平苔藓与糖尿病的病例对照研究,检索时间截至2021年1...目的系统分析口腔扁平苔藓与糖尿病的关联。方法检索中国知网、维普、万方数据库、中国生物医学文献服务系统及PubMed、Web of Science、EMBASE、Cochrane Library数据库中关于口腔扁平苔藓与糖尿病的病例对照研究,检索时间截至2021年1月1日,依照纳入、排除标准进行人工筛选。根据研究主体不同将研究内容分为口腔扁平苔藓组(口腔扁平苔藓人群以患糖尿病为结局)和糖尿病组(糖尿病人群以患口腔扁平苔藓为结局)。采用RevMan 5.3软件分析口腔扁平苔藓与糖尿病之间的合并OR及其95%CI。结果纳入研究的17篇文献中,归入口腔扁平苔藓组5篇(I^(2)=0%),病例934例,对照1656例;糖尿病组12篇(I^(2)=19%),病例5252例,对照3837例。口腔扁平苔藓组糖尿病患病合并OR及95%CI为2.12(1.40,3.19),差异有统计学意义(P=0.0003);糖尿病组口腔扁平苔藓患病合并OR及95%CI为2.26(1.49,3.44),差异有统计学意义(P=0.0001)。结论糖尿病和口腔扁平苔藓之间存在显著的关联。展开更多
基金Project(51578511)supported by the National Natural Science Foundation of China。
文摘To further investigate the one-dimensional(1D)rheological consolidation mechanism of double-layered soil,the fractional derivative Merchant model(FDMM)and the non-Darcian flow model with the non-Newtonian index are respectively introduced to describe the deformation of viscoelastic soil and the flow of pore water in the process of consolidation.Accordingly,an 1D rheological consolidation equation of double-layered soil is obtained,and its numerical analysis is performed by the implicit finite difference method.In order to verify its validity,the numerical solutions by the present method for some simplified cases are compared with the results in the related literature.Then,the influence of the revelent parameters on the rheological consolidation of double-layered soil are investigated.Numerical results indicate that the parameters of non-Darcian flow and FDMM of the first soil layer greatly influence the consolidation rate of double-layered soil.As the decrease of relative compressibility or the increase of relative permeability between the lower soil and the upper soil,the dissipation rate of excess pore water pressure and the settlement rate of the ground will be accelerated.Increasing the relative thickness of soil layer with high permeability or low compressibility will also accelerate the consolidation rate of double-layered soil.
文摘目的系统分析口腔扁平苔藓与糖尿病的关联。方法检索中国知网、维普、万方数据库、中国生物医学文献服务系统及PubMed、Web of Science、EMBASE、Cochrane Library数据库中关于口腔扁平苔藓与糖尿病的病例对照研究,检索时间截至2021年1月1日,依照纳入、排除标准进行人工筛选。根据研究主体不同将研究内容分为口腔扁平苔藓组(口腔扁平苔藓人群以患糖尿病为结局)和糖尿病组(糖尿病人群以患口腔扁平苔藓为结局)。采用RevMan 5.3软件分析口腔扁平苔藓与糖尿病之间的合并OR及其95%CI。结果纳入研究的17篇文献中,归入口腔扁平苔藓组5篇(I^(2)=0%),病例934例,对照1656例;糖尿病组12篇(I^(2)=19%),病例5252例,对照3837例。口腔扁平苔藓组糖尿病患病合并OR及95%CI为2.12(1.40,3.19),差异有统计学意义(P=0.0003);糖尿病组口腔扁平苔藓患病合并OR及95%CI为2.26(1.49,3.44),差异有统计学意义(P=0.0001)。结论糖尿病和口腔扁平苔藓之间存在显著的关联。