On the basis of elastic rebound theory,using the horizontal velocity field of the Chinese mainland calculated from GPS data during three observation periods from 1999 to 2007,the velocity components that are parallel ...On the basis of elastic rebound theory,using the horizontal velocity field of the Chinese mainland calculated from GPS data during three observation periods from 1999 to 2007,the velocity components that are parallel and plumb to the fault zone are calculated respectively for different periods,and then relative ground movements of two sides of the fault zone are analyzed with power function fitting and graphics. The results show that the relative ground movement shows right-lateral shear deformation before the Wenchuan MS8. 0 earthquake,and at the same time the movement was hindered by the Longmenshan fault zone. Thus,this result has positive significance for distinguishing the elastic strain energy accumulation and deformation anomaly in an earthquake preparation process,and for conducting further research on earthquake prediction.展开更多
目的通过计算流体动力学(computational fluid dynamics,CFD)分析右冠状动脉起源于左冠状窦(anomalous origin of the right coronary artery from the left coronary artery sinus,AORL)的血流动力学参数,从而有效评估疾病。方法选取...目的通过计算流体动力学(computational fluid dynamics,CFD)分析右冠状动脉起源于左冠状窦(anomalous origin of the right coronary artery from the left coronary artery sinus,AORL)的血流动力学参数,从而有效评估疾病。方法选取正常右冠状动脉(right coronary artery,RCA)和AORL两例个体病例,在Mimics软件中重建两个病例的血管模型,并将模型导入ANSYS CFX软件中进行血流动力学模拟计算,比较正常和AORL两种模型的血流动力学情况。结果AORL模型右冠状动脉入口截面具有较小的血流量(9.35 cm^3/s),有可能会导致右冠状动脉下游供血不足;AORL模型右冠状动脉急性拐角处的压力(13.78 kPa)相比于正常模型右冠状动脉(14.9 kPa)较低;AORL模型壁面剪切力(12.83 Pa)大于正常模型(9.74 Pa);AORL模型血管壁变形量较大。结论AORL入口流速及拐角处压力均比正常RCA小,从而可能导致缺血症状发生。研究结果对临床上有效评估缺血等疾病具有理论指导意义。展开更多
A computer simulation of the blood flow in a patient specific atherosclerotic right coronary artery is carried out to study the blood flow pattern and the wall shear stress (WSS) distribution in the artery. Both tempo...A computer simulation of the blood flow in a patient specific atherosclerotic right coronary artery is carried out to study the blood flow pattern and the wall shear stress (WSS) distribution in the artery. Both temporal and special distribution patterns of the WSS of the non-Newtonian blood flow are presented and the regions on the lumen surface where the WSS is constantly lower than 1N/m2are identified.展开更多
基金funded by the Special Subject of the National Key Technology R&D Program for the 11th "Five-year Plan" of China(2006BAC01B02-02-02)
文摘On the basis of elastic rebound theory,using the horizontal velocity field of the Chinese mainland calculated from GPS data during three observation periods from 1999 to 2007,the velocity components that are parallel and plumb to the fault zone are calculated respectively for different periods,and then relative ground movements of two sides of the fault zone are analyzed with power function fitting and graphics. The results show that the relative ground movement shows right-lateral shear deformation before the Wenchuan MS8. 0 earthquake,and at the same time the movement was hindered by the Longmenshan fault zone. Thus,this result has positive significance for distinguishing the elastic strain energy accumulation and deformation anomaly in an earthquake preparation process,and for conducting further research on earthquake prediction.
文摘目的通过计算流体动力学(computational fluid dynamics,CFD)分析右冠状动脉起源于左冠状窦(anomalous origin of the right coronary artery from the left coronary artery sinus,AORL)的血流动力学参数,从而有效评估疾病。方法选取正常右冠状动脉(right coronary artery,RCA)和AORL两例个体病例,在Mimics软件中重建两个病例的血管模型,并将模型导入ANSYS CFX软件中进行血流动力学模拟计算,比较正常和AORL两种模型的血流动力学情况。结果AORL模型右冠状动脉入口截面具有较小的血流量(9.35 cm^3/s),有可能会导致右冠状动脉下游供血不足;AORL模型右冠状动脉急性拐角处的压力(13.78 kPa)相比于正常模型右冠状动脉(14.9 kPa)较低;AORL模型壁面剪切力(12.83 Pa)大于正常模型(9.74 Pa);AORL模型血管壁变形量较大。结论AORL入口流速及拐角处压力均比正常RCA小,从而可能导致缺血症状发生。研究结果对临床上有效评估缺血等疾病具有理论指导意义。
文摘A computer simulation of the blood flow in a patient specific atherosclerotic right coronary artery is carried out to study the blood flow pattern and the wall shear stress (WSS) distribution in the artery. Both temporal and special distribution patterns of the WSS of the non-Newtonian blood flow are presented and the regions on the lumen surface where the WSS is constantly lower than 1N/m2are identified.
