This paper proposes a straightforward and concise approach to analyze the Saint-Venant’s torsion of a circular shaft containing multiple elliptical inclusions or cracks based on the complex variable method.The comple...This paper proposes a straightforward and concise approach to analyze the Saint-Venant’s torsion of a circular shaft containing multiple elliptical inclusions or cracks based on the complex variable method.The complex potentials are first derived for the shaft with N elliptical inclusions by introducing Faber series expansion,and then the shear stresses and torsional rigidity are calculated.When the inclusions degenerate into cracks,the solutions for the intensity factors of stress are obtained.Finally,several numerical examples are carried out to discuss the effects of geometry parameters,different shear modulus ratios and array-types of the elliptical inclusions/cracks on the fields of stresses.The obtained results show that the proposed approach has advantages such as high accuracy and good convergence.展开更多
Analyzing and discussing advantages of3D laparoscopic surgery in postoperative recovery Method： Selecting patients were treated by 2D laparoscopic surgery or 3D laparoscopic,surgery in our hospital from January 2015...Analyzing and discussing advantages of3D laparoscopic surgery in postoperative recovery Method： Selecting patients were treated by 2D laparoscopic surgery or 3D laparoscopic,surgery in our hospital from January 2015 to January 2016 as research subjects. According to different methods, we separate patients into two groups, and each group is 150 patients. The one is test group （3D laparoscopic surgery）, and the other is control group（2D laparoscopic surgery）. Observing two groups for some factors, such as probability of surgical injury, post-operative exhaust time, catheterization time, time of drainage tube placement and hospital time. Result： The magnification of3D laparoscopy image is significantly better than 2D laparoscopy. Error damage fraction of test group（2. 00%） is lower than control group （28.00%）, which effectively reduces the probability of total surgical errors and provides more accurate operation. At the same time, exhaust time, catheterization time, time of drainage tube placement and hospital time of test group are significantly lower than the control group, statistically significant （p〈0.05）. Conclusion： 3D laparoscopic surgery has characterizations of easy operation, small window, fast recovery and small probability of complications occurrence. The HD vision is widen to improve the level of minimally invasive surgery and it is worthy of clinical application.展开更多
基金supported by the National Natural Science Fund of China (No. 11802040)the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(No.18KJB130001)
文摘This paper proposes a straightforward and concise approach to analyze the Saint-Venant’s torsion of a circular shaft containing multiple elliptical inclusions or cracks based on the complex variable method.The complex potentials are first derived for the shaft with N elliptical inclusions by introducing Faber series expansion,and then the shear stresses and torsional rigidity are calculated.When the inclusions degenerate into cracks,the solutions for the intensity factors of stress are obtained.Finally,several numerical examples are carried out to discuss the effects of geometry parameters,different shear modulus ratios and array-types of the elliptical inclusions/cracks on the fields of stresses.The obtained results show that the proposed approach has advantages such as high accuracy and good convergence.
文摘Analyzing and discussing advantages of3D laparoscopic surgery in postoperative recovery Method： Selecting patients were treated by 2D laparoscopic surgery or 3D laparoscopic,surgery in our hospital from January 2015 to January 2016 as research subjects. According to different methods, we separate patients into two groups, and each group is 150 patients. The one is test group （3D laparoscopic surgery）, and the other is control group（2D laparoscopic surgery）. Observing two groups for some factors, such as probability of surgical injury, post-operative exhaust time, catheterization time, time of drainage tube placement and hospital time. Result： The magnification of3D laparoscopy image is significantly better than 2D laparoscopy. Error damage fraction of test group（2. 00%） is lower than control group （28.00%）, which effectively reduces the probability of total surgical errors and provides more accurate operation. At the same time, exhaust time, catheterization time, time of drainage tube placement and hospital time of test group are significantly lower than the control group, statistically significant （p〈0.05）. Conclusion： 3D laparoscopic surgery has characterizations of easy operation, small window, fast recovery and small probability of complications occurrence. The HD vision is widen to improve the level of minimally invasive surgery and it is worthy of clinical application.
