Factors influencing the outcome of embryo freezing and Ihawing program

Objective: To investigate the factors that might influence the sucess of an ernbryo freezing and thawing program.Method: The relationship between the pregnancy rate in 73 cycles of embryo freezing and thewing program and the following factors was analyzed;matermal age,E2 level at the time of HCG trigger,embryo storage time,number of thawed embryos transferred,presence of sponsoring embryos and intact embryos.And the suvival rate of thawed embryos with different morphology,cell stage and storage time was evaluated.Result:Transfer with three of more than three thawed embryos resulted in pragnancy rates of 38.5% and 35.7%,respectively.compared with 5.3% for transfer of fewer than three embryos.The presence of sponsoring embryos and intact embryos significantly incresses pregnancy rate in embryo freezing and thawing program .No other factor examined had any effect on pregnancy outcome.The survival rate of good morphology embryos was higher than poor ones,but was not influenced by cell stage and storage time.Conclusion:Embryo morphology before freezing , number of thawed embryos transferred and the presence of intact embryos are important to the outcome of embryo freezing and thawing program.     

一种连通孔最小化的布线算法

提出了一种先分层、后布线的减少连通孔的布线算法，该算法的主要思想是从总体上考虑布线的，即先从总体上考虑连通孔最小化，再行布线比传统的布线方法更为紧凑和有效，最后通过实例验证了该算法，并给出了计算结果     

一类二阶自治系统稳定性的讨论

就含多个参数的一类二阶自治系统,利用无量纲化及线性近似方法讨论了它的稳定性和参数的区域.     

震撼东瀛的东京佐川疑案

此案可能成为战后日本最大的丑闻,不管结局如何,它都将对7月份的参议院选举产生重大影响。     

映射的连续性成立条件之注记

本文首先在拓扑空间中探讨了映射的连续性成立的条件,然后在线性拓扑空间中论述了线性映射的连续几个满足的条件。     

月亮该炸不该炸?

随着科学技术的发展,科学家越来越感到,月亮是个宝。据统计,到目前已发现月球上有89种矿物,它们所含大量元素正是地球上的"紧俏产品"。月球上有大量的能源,如太阳的光和热可用来分离和精制各种矿物。月球两极存在着价值极高的冰。土壤中含有地球上没有的氦气,其储量用来发电可供整个地球用300年。更为重要的是,美国科学家谢鲁·皮尔逊研究认     

一种适用于CAI的圆柱相贯线的新方法

该文通过对正交圆柱相贯线各种作图法的比较分析，结合当今计算机辅助绘图的水平，明确了在ＣＡＩ课件制作中所采用的计算机辅助绘图的基本方法，在此基础上提出与在ＣＡＩ课件中计算机辅助绘图思路相一致的新作图法，这处作图法选取了辅助绘图同样的关键点，使相贯线更精确，概念更清楚，充实，完善了传统作法图，与发展中的计算机绘图技术更加密切，适应了工程图学发展的需要。