In the leg-lowering process,the offshore jack-up platform is in a floating state,and the spudcan may collide with the seabed due to the platform motion in waves,thereby threatening the safety and stability of the plat...In the leg-lowering process,the offshore jack-up platform is in a floating state,and the spudcan may collide with the seabed due to the platform motion in waves,thereby threatening the safety and stability of the platform.This paper first analyzed the hydrodynamic response of a jack-up platform under different sea states.Then a finite-element model was established which considered the material and geometrical nonlinearity in the structure and the nonlinear interaction between soil and structure to investigate the collision response between the spudcan and seabed during lowering jack-up legs.The results show that the dynamic response of the platform decreases and gradually tends to be stable as the wave period increases.The motion response of the platform reach the largest value when the wave period is 8 s and the wave direction is 0°.The collision angle between the spudcan and seabed has a large influence on the collision response,while the velocity of leg-lowering has little influence on the collision response.The collision response is also significantly affected by soil conditions.For clay,the increase in undrained shear strength and Young’s modulus will increase the impact force.展开更多
目的探究丝裂霉素C (MMC)联合高频治疗仪并双路环形泪道引流在上泪道阻塞中应用价值。方法选择2017年7月至2019年7月于武安市第一人民医院治疗的82例(86只眼)上泪道阻塞患者,其中男性40例,女性42例;年龄20~60岁,平均年龄38.75岁。随机...目的探究丝裂霉素C (MMC)联合高频治疗仪并双路环形泪道引流在上泪道阻塞中应用价值。方法选择2017年7月至2019年7月于武安市第一人民医院治疗的82例(86只眼)上泪道阻塞患者,其中男性40例,女性42例;年龄20~60岁,平均年龄38.75岁。随机分为对照组(41例43只眼)和观察组(41例43只眼)。对照组采用高频治疗仪并双路环形泪道引流治疗,观察组采用MMC联合高频治疗仪并双路环形泪道引流治疗。比较两组患者的临床疗效;比较两组患者的手术时间、住院时间及术后拔管时间;比较两组患者治疗前后的眼表改变评分、泪膜破裂时间、眼泪P物质(SP)含量和泪液弯液面水平;比较两组患者术后并发症发生情况;Kaplan-Meier法绘制生存曲线,比较两组患者术后1年内未复发率。结果对照组与观察组治疗前的眼表改变评分[(32.21±2.52)分vs (32.45±2.61)分]、泪膜破裂时间[(8.35±0.76) s vs (8.38±0.80) s]、眼泪SP含量[(348.75±18.58) pg/mL vs (356.64±17.66) pg/mL]、泪液弯液面水平[(0.63±0.18) mm vs (0.65±0.20) mm]及术后并发症发生率(25.58%vs 13.95%)差异无统计学意义(P> 0.05);两组患者治疗后的眼表改变评分[(29.12±1.83)分vs (26.06±1.55)分]、眼泪SP含量[(295.47±15.31) pg/mL vs (258.72±12.49) pg/mL]、泪液弯液面水平[(0.46±0.16) mm vs (0.25±0.15) mm]明显降低,泪膜破裂时间[(8.87±0.85) s vs (9.60±0.88) s]明显增加(P <0.05),观察组各指标的改善情况明显优于对照组(P <0.05);观察组治疗后的住院时间[(4.15±2.21) d]、术后拔管时间[(4.06±1.07)个月]明显短于对照组[(6.05±2.18) d、(4.65±1.28)个月],治疗总有效率(81.40%)和未复发率(81.40%)明显高于对照组(51.16%、58.14%)(P <0.05)。结论 MMC联合高频治疗仪并双路环形泪道引流治疗上泪道阻塞能够明显提高患者治疗的总有效率,促进患者恢复,降低患者术后复发率。展开更多
基金financially supported by the National Natural Science Foundation of China(Grant No.51779171)the Tianjin Municipal Natural Science Foundation(Grant No.18JCYBJC22800)。
文摘In the leg-lowering process,the offshore jack-up platform is in a floating state,and the spudcan may collide with the seabed due to the platform motion in waves,thereby threatening the safety and stability of the platform.This paper first analyzed the hydrodynamic response of a jack-up platform under different sea states.Then a finite-element model was established which considered the material and geometrical nonlinearity in the structure and the nonlinear interaction between soil and structure to investigate the collision response between the spudcan and seabed during lowering jack-up legs.The results show that the dynamic response of the platform decreases and gradually tends to be stable as the wave period increases.The motion response of the platform reach the largest value when the wave period is 8 s and the wave direction is 0°.The collision angle between the spudcan and seabed has a large influence on the collision response,while the velocity of leg-lowering has little influence on the collision response.The collision response is also significantly affected by soil conditions.For clay,the increase in undrained shear strength and Young’s modulus will increase the impact force.
文摘目的探究丝裂霉素C (MMC)联合高频治疗仪并双路环形泪道引流在上泪道阻塞中应用价值。方法选择2017年7月至2019年7月于武安市第一人民医院治疗的82例(86只眼)上泪道阻塞患者,其中男性40例,女性42例;年龄20~60岁,平均年龄38.75岁。随机分为对照组(41例43只眼)和观察组(41例43只眼)。对照组采用高频治疗仪并双路环形泪道引流治疗,观察组采用MMC联合高频治疗仪并双路环形泪道引流治疗。比较两组患者的临床疗效;比较两组患者的手术时间、住院时间及术后拔管时间;比较两组患者治疗前后的眼表改变评分、泪膜破裂时间、眼泪P物质(SP)含量和泪液弯液面水平;比较两组患者术后并发症发生情况;Kaplan-Meier法绘制生存曲线,比较两组患者术后1年内未复发率。结果对照组与观察组治疗前的眼表改变评分[(32.21±2.52)分vs (32.45±2.61)分]、泪膜破裂时间[(8.35±0.76) s vs (8.38±0.80) s]、眼泪SP含量[(348.75±18.58) pg/mL vs (356.64±17.66) pg/mL]、泪液弯液面水平[(0.63±0.18) mm vs (0.65±0.20) mm]及术后并发症发生率(25.58%vs 13.95%)差异无统计学意义(P> 0.05);两组患者治疗后的眼表改变评分[(29.12±1.83)分vs (26.06±1.55)分]、眼泪SP含量[(295.47±15.31) pg/mL vs (258.72±12.49) pg/mL]、泪液弯液面水平[(0.46±0.16) mm vs (0.25±0.15) mm]明显降低,泪膜破裂时间[(8.87±0.85) s vs (9.60±0.88) s]明显增加(P <0.05),观察组各指标的改善情况明显优于对照组(P <0.05);观察组治疗后的住院时间[(4.15±2.21) d]、术后拔管时间[(4.06±1.07)个月]明显短于对照组[(6.05±2.18) d、(4.65±1.28)个月],治疗总有效率(81.40%)和未复发率(81.40%)明显高于对照组(51.16%、58.14%)(P <0.05)。结论 MMC联合高频治疗仪并双路环形泪道引流治疗上泪道阻塞能够明显提高患者治疗的总有效率,促进患者恢复,降低患者术后复发率。
