Wave-induced harbour resonance is numerically investigated inside a harbour with lateral cavities.The theoretical solutions for the amplification parameter are compared with the simulated results under varying dimensi...Wave-induced harbour resonance is numerically investigated inside a harbour with lateral cavities.The theoretical solutions for the amplification parameter are compared with the simulated results under varying dimensionless wave numbers in order to verify the simulation model in a rectangular harbour at a constant depth.The results indicate that the numerical model can correctly calculate the natural frequency and the natural wave height.A range of calculations are performed for harbour resonance with one pair of lateral cavities,two pairs of lateral cavities and three pairs of lateral cavities,respectively.The simulated results indicate that the amplitude of the amplification parameter decreases both at the primary natural oscillation and the secondary natural oscillation,as the number of lateral cavities increases.The dimensionless wave number reduces as the number of lateral cavities increases both at the primary natural oscillation and the secondary natural oscillation as well.展开更多
目的探讨计算机断层扫描血管造影(CTA)定量评价广西壮族人群非瓣膜性房颤患者左心耳结构与血栓形成的关系。方法选取2020年7月~2022年6月崇左市人民医院、钦州市第一人民医院、柳州市工人医院180例广西壮族人群非瓣膜性房颤患者,均行经...目的探讨计算机断层扫描血管造影(CTA)定量评价广西壮族人群非瓣膜性房颤患者左心耳结构与血栓形成的关系。方法选取2020年7月~2022年6月崇左市人民医院、钦州市第一人民医院、柳州市工人医院180例广西壮族人群非瓣膜性房颤患者,均行经食道超声心动图(TEE)、心脏CTA检查,以TEE为标准,统计CTA诊断左心耳血栓价值,分析CTA与TEE评价左心耳空间形态的一致性。根据TEE左心耳是否有血栓分为血栓组(80例)、无血栓组(100例),比较两组一般资料、开口长径、开口短径、开口周长、左心房容积、左心耳容积、左上肺静脉口长径、左心耳空间形态,经Logistic回归方程分析左心耳血栓形成的相关影响因素。结果经CTA检查共检出左心耳血栓77例,诊断敏感度为92.50%(74/80),特异度为97.00%(97/100);C T A评价左心耳空间形态与T E E的一致性为98.89%(178/180),Kappa值为0.983(95%CI:0.891~1.075)(P<0.05);血栓组开口短径、开口长径、开口周长、左心耳容积、左心房容积、左上肺静脉口长径大于无血栓组,左心耳空间形态与无血栓组比较,差异有统计学意义(P<0.05);左心耳开口长径、开口短径、左心耳容积、开口周长、左心房容积、左上肺静脉口长径、菜花型、仙人掌型左心耳均与左心耳血栓形成具有相关性(OR=15.616、11.195、14.096、11.724、14.764、8.527、19.878、16.358,P<0.05)。结论CTA检查对左心耳血栓具有较高诊断价值,可客观、准确评估左心耳形态结构对血栓形成的影响,为临床术前评估血栓性事件风险提供依据。展开更多
基金supported by Fund of Key Laboratory for Sustainable Utilization of Open-sea Fishery,Ministry of Agriculture and Rural Affairs,P.R.China(Grant No.LOF 2022-04).
文摘Wave-induced harbour resonance is numerically investigated inside a harbour with lateral cavities.The theoretical solutions for the amplification parameter are compared with the simulated results under varying dimensionless wave numbers in order to verify the simulation model in a rectangular harbour at a constant depth.The results indicate that the numerical model can correctly calculate the natural frequency and the natural wave height.A range of calculations are performed for harbour resonance with one pair of lateral cavities,two pairs of lateral cavities and three pairs of lateral cavities,respectively.The simulated results indicate that the amplitude of the amplification parameter decreases both at the primary natural oscillation and the secondary natural oscillation,as the number of lateral cavities increases.The dimensionless wave number reduces as the number of lateral cavities increases both at the primary natural oscillation and the secondary natural oscillation as well.
文摘目的探讨计算机断层扫描血管造影(CTA)定量评价广西壮族人群非瓣膜性房颤患者左心耳结构与血栓形成的关系。方法选取2020年7月~2022年6月崇左市人民医院、钦州市第一人民医院、柳州市工人医院180例广西壮族人群非瓣膜性房颤患者,均行经食道超声心动图(TEE)、心脏CTA检查,以TEE为标准,统计CTA诊断左心耳血栓价值,分析CTA与TEE评价左心耳空间形态的一致性。根据TEE左心耳是否有血栓分为血栓组(80例)、无血栓组(100例),比较两组一般资料、开口长径、开口短径、开口周长、左心房容积、左心耳容积、左上肺静脉口长径、左心耳空间形态,经Logistic回归方程分析左心耳血栓形成的相关影响因素。结果经CTA检查共检出左心耳血栓77例,诊断敏感度为92.50%(74/80),特异度为97.00%(97/100);C T A评价左心耳空间形态与T E E的一致性为98.89%(178/180),Kappa值为0.983(95%CI:0.891~1.075)(P<0.05);血栓组开口短径、开口长径、开口周长、左心耳容积、左心房容积、左上肺静脉口长径大于无血栓组,左心耳空间形态与无血栓组比较,差异有统计学意义(P<0.05);左心耳开口长径、开口短径、左心耳容积、开口周长、左心房容积、左上肺静脉口长径、菜花型、仙人掌型左心耳均与左心耳血栓形成具有相关性(OR=15.616、11.195、14.096、11.724、14.764、8.527、19.878、16.358,P<0.05)。结论CTA检查对左心耳血栓具有较高诊断价值,可客观、准确评估左心耳形态结构对血栓形成的影响,为临床术前评估血栓性事件风险提供依据。
