Objective:To evaluate the factors influencing success rate of in vitro fertilization/embryo transfer(IVF/ET).Methods:A retrospective study of 770 consecutive cycles undergone IVF/ET or in-tracytoplasmic sperm injectio...Objective:To evaluate the factors influencing success rate of in vitro fertilization/embryo transfer(IVF/ET).Methods:A retrospective study of 770 consecutive cycles undergone IVF/ET or in-tracytoplasmic sperm injection(ICSI)from March 1999 to June 2001.Estradiol and pro-gesterone concentrations on the day of hCG administration were measured.Factors effecting embryo transfer on the effects of clinical pregnancy rate were evaluated.Results:The overall clinical pregnancy rate in 770 cycles was 40.8%.Take home baby rate was 31%.No significantly differences rate were observed between groups with different estradiol levels.If the progesterone concentration on the day of hCG ad-ministration was>6.36 nmol/L,the implantation and clinical pregnancy rate was lower(P<0.003).The lowest clinical pregnancy rate was observed when the duration of in-fertility was≥10 years.The average number of embryos transferred was 2.23±0.83.Conclusion:This study demonstrated that the most important factor on clinical pregnancy rate was low progesterone concentration on the day of hCG administration.The other two important variables influencing success rate of IVF/ET were the duration of infertility,the number of high-grade embryos transferred.展开更多
The whole analysis process of pneumatic stressed membrane structure contains nine states and seven analysis processes.The zero-stress state is the corner-stone of analysis and design of pneumatic stressed structure,an...The whole analysis process of pneumatic stressed membrane structure contains nine states and seven analysis processes.The zero-stress state is the corner-stone of analysis and design of pneumatic stressed structure,and has significant impact on the pre-stressed state and load state.According to the logical model of the whole numerical analysis process of pneumatic stressed structure,a numerical analysis method to solve the zero-stress state from the elasticized equilibrium state was firstly proposed,called linear compatibility matrix M-P inverse method.Firstly,the pneumatic membrane stressed structure was transferred into grid structure by using membrane link to simulate membrane surface.Secondly,on the basis of equilibrium matrix theory of pin joint structure and small deformation assumption,compatibility equation of system was established.Thirdly,the unstressed length and elongation of links were calculated from the tension and material parameters of elasticized equilibrium state.Finally,using compatibility matrix M-P inverse,the nodal displacement was calculated by solving compatibility equation,the configuration of zero-stress state could be obtained through reverse superposition,and the stress was released.According to the algorithm,the program was coded with MATLAB.The correctness and efficiency of this method were verified by several numerical examples,and it could be found that one elasticized equilibrium state corresponded to one configuration of the zero-stress state.The work has theoretical significance and practical guidance value for pneumatic membrane structural design.展开更多
文摘Objective:To evaluate the factors influencing success rate of in vitro fertilization/embryo transfer(IVF/ET).Methods:A retrospective study of 770 consecutive cycles undergone IVF/ET or in-tracytoplasmic sperm injection(ICSI)from March 1999 to June 2001.Estradiol and pro-gesterone concentrations on the day of hCG administration were measured.Factors effecting embryo transfer on the effects of clinical pregnancy rate were evaluated.Results:The overall clinical pregnancy rate in 770 cycles was 40.8%.Take home baby rate was 31%.No significantly differences rate were observed between groups with different estradiol levels.If the progesterone concentration on the day of hCG ad-ministration was>6.36 nmol/L,the implantation and clinical pregnancy rate was lower(P<0.003).The lowest clinical pregnancy rate was observed when the duration of in-fertility was≥10 years.The average number of embryos transferred was 2.23±0.83.Conclusion:This study demonstrated that the most important factor on clinical pregnancy rate was low progesterone concentration on the day of hCG administration.The other two important variables influencing success rate of IVF/ET were the duration of infertility,the number of high-grade embryos transferred.
基金supported by the National Natural Science Foundation of China (Grant Nos. 50878128, 50808122)
文摘The whole analysis process of pneumatic stressed membrane structure contains nine states and seven analysis processes.The zero-stress state is the corner-stone of analysis and design of pneumatic stressed structure,and has significant impact on the pre-stressed state and load state.According to the logical model of the whole numerical analysis process of pneumatic stressed structure,a numerical analysis method to solve the zero-stress state from the elasticized equilibrium state was firstly proposed,called linear compatibility matrix M-P inverse method.Firstly,the pneumatic membrane stressed structure was transferred into grid structure by using membrane link to simulate membrane surface.Secondly,on the basis of equilibrium matrix theory of pin joint structure and small deformation assumption,compatibility equation of system was established.Thirdly,the unstressed length and elongation of links were calculated from the tension and material parameters of elasticized equilibrium state.Finally,using compatibility matrix M-P inverse,the nodal displacement was calculated by solving compatibility equation,the configuration of zero-stress state could be obtained through reverse superposition,and the stress was released.According to the algorithm,the program was coded with MATLAB.The correctness and efficiency of this method were verified by several numerical examples,and it could be found that one elasticized equilibrium state corresponded to one configuration of the zero-stress state.The work has theoretical significance and practical guidance value for pneumatic membrane structural design.
