Unified analytical solutions are presented for the predictions of the stresses and displacements around a circular opening based on nonqinear unified failure criterion and the elastic-brittle-plastic softening model. ...Unified analytical solutions are presented for the predictions of the stresses and displacements around a circular opening based on nonqinear unified failure criterion and the elastic-brittle-plastic softening model. Unified analytical solutions not only involve generally traditional solutions which are based on the Hock-Brown （H-B） failure criterion or the non-linear twin-shear failure criterion, but also involve other new results. The results of the radius of plastic zone, radial displacements and stresses are obviously different using three rock masses when different values of the unified failure criterion parameter or different material behavior models are used. For a given condition, the radius of plastic zone and radial displacements are reduced by increasing the unified failure criterion parameter. The latent potentialities of rock mass result from considering the effect of intermediate principal stress. It is shown that proper choices of the failure criterion and the material behavior model for rock mass are significant in the tunnel design.展开更多
目的探究神经介入联合阿替普酶静脉溶栓对急性缺血性脑卒中(AIS)患者脑血流动力学及神经功能的影响,为患者的治疗提供参考。方法回顾性分析榆林市星元医院神经内二科2015年12月至2018年12月收治的102例AIS患者的临床诊治资料,按照患者...目的探究神经介入联合阿替普酶静脉溶栓对急性缺血性脑卒中(AIS)患者脑血流动力学及神经功能的影响,为患者的治疗提供参考。方法回顾性分析榆林市星元医院神经内二科2015年12月至2018年12月收治的102例AIS患者的临床诊治资料,按照患者治疗方式将其分为观察组50例和对照组52例。对照组患者采用阿替普酶静脉溶栓治疗,观察组在对照组治疗的基础上联合神经介入治疗,连续治疗3个月,比较患者治疗后的临床疗效、脑血流动力学各项指标水平以及治疗前后的神经功能缺损评分(NIHSS)。结果治疗后观察组患者的治疗总有效率为96.0%,明显高于对照组的86.5%,差异有统计学意义(P<0.05);治疗后,观察组和对照组患者的血流速度(Vmin)[(9.9±1.8) cm/s vs (9.1±1.5) cm/s]、最小血流量(Qmin)[(4.9±1.2) mL/s vs (4.2±1.3) mL/s]、动态阻抗(DR)[(483.5±156.2) Pa·s/mL vs (418.4±159.2) Pa·s/mL]比较,观察组明显高于对照组,脑血管外周阻力(R)[(1 825.3±251.5) Pa·s/mL vs 1 965.5±261.8 Pa·s/m]、临界压力(CP)[(6.2±1.6) kPa vs (6.9±1.6) kPa]比较,观察组明显低于对照组,差异均有统计学意义(P<0.05),而脉搏波速(Wv)[(20.9±3.9) m/s vs (20.8±4.1) m/s]比较差异无统计学意义(P>0.05);两组患者治疗前的NIHSS评分比较差异无统计学意义(P>0.05);治疗24 h和治疗3个月后,观察组患者的NIHSS评分分别为(16.4±3.1)分,(11.3±2.1)分,明显低于对照组的(19.5±3.6)分,(15.8±2.9)分,差异均有统计学意义(P<0.05)。结论神经介入联合阿替普酶静脉溶栓治疗急性缺血性脑卒中临床疗效显著,能明显改善患者的神经功能,值得推广应用。展开更多
基金Project (No.SJ08E204) supported by the Natural Science Foundation of Shanxi Province,China
文摘Unified analytical solutions are presented for the predictions of the stresses and displacements around a circular opening based on nonqinear unified failure criterion and the elastic-brittle-plastic softening model. Unified analytical solutions not only involve generally traditional solutions which are based on the Hock-Brown （H-B） failure criterion or the non-linear twin-shear failure criterion, but also involve other new results. The results of the radius of plastic zone, radial displacements and stresses are obviously different using three rock masses when different values of the unified failure criterion parameter or different material behavior models are used. For a given condition, the radius of plastic zone and radial displacements are reduced by increasing the unified failure criterion parameter. The latent potentialities of rock mass result from considering the effect of intermediate principal stress. It is shown that proper choices of the failure criterion and the material behavior model for rock mass are significant in the tunnel design.
文摘目的探究神经介入联合阿替普酶静脉溶栓对急性缺血性脑卒中(AIS)患者脑血流动力学及神经功能的影响,为患者的治疗提供参考。方法回顾性分析榆林市星元医院神经内二科2015年12月至2018年12月收治的102例AIS患者的临床诊治资料,按照患者治疗方式将其分为观察组50例和对照组52例。对照组患者采用阿替普酶静脉溶栓治疗,观察组在对照组治疗的基础上联合神经介入治疗,连续治疗3个月,比较患者治疗后的临床疗效、脑血流动力学各项指标水平以及治疗前后的神经功能缺损评分(NIHSS)。结果治疗后观察组患者的治疗总有效率为96.0%,明显高于对照组的86.5%,差异有统计学意义(P<0.05);治疗后,观察组和对照组患者的血流速度(Vmin)[(9.9±1.8) cm/s vs (9.1±1.5) cm/s]、最小血流量(Qmin)[(4.9±1.2) mL/s vs (4.2±1.3) mL/s]、动态阻抗(DR)[(483.5±156.2) Pa·s/mL vs (418.4±159.2) Pa·s/mL]比较,观察组明显高于对照组,脑血管外周阻力(R)[(1 825.3±251.5) Pa·s/mL vs 1 965.5±261.8 Pa·s/m]、临界压力(CP)[(6.2±1.6) kPa vs (6.9±1.6) kPa]比较,观察组明显低于对照组,差异均有统计学意义(P<0.05),而脉搏波速(Wv)[(20.9±3.9) m/s vs (20.8±4.1) m/s]比较差异无统计学意义(P>0.05);两组患者治疗前的NIHSS评分比较差异无统计学意义(P>0.05);治疗24 h和治疗3个月后,观察组患者的NIHSS评分分别为(16.4±3.1)分,(11.3±2.1)分,明显低于对照组的(19.5±3.6)分,(15.8±2.9)分,差异均有统计学意义(P<0.05)。结论神经介入联合阿替普酶静脉溶栓治疗急性缺血性脑卒中临床疗效显著,能明显改善患者的神经功能,值得推广应用。
