Different sperm sources and parameters can influence intracytoplasmic sperm injection outcomes before embryo implantation

To evaluate the effects of sperm with different parameters and sources on the outcomes of intracytoplasmic sperm injection (ICSI), 1972 ICSI cycles were analyzed retrospectively. Groups 1 to 5 were composed of cycles using ejaculated sperm and were grouped according to sperm quantity, quality, and morphology into normal (288 cycles), or mild (329 cycles), moderate (522 cycles), severe (332 cycles), and extremely severe (171 cycles) oligozoospermia and/or asthenozoospermia and/or teratozoospermia (OAT) groups. Group 6 was composed of 250 cycles using testicular or epididymal sperm, and Group 7 consisted of 80 cycles using frozen-thawed sperm. We found that fertilization rates were gradually reduced from Groups 1 to 6, and reached statistical difference in Groups 5 and 6 (P<0.05). The high-quality embryo rate was higher in Group 1 than in Groups 2, 3, 5, 6, and 7 (P<0.05). No statistical differences were observed in the rates of embryo cleavage, clinical pregnancy, miscarriage, live-birth, premature birth, low birth weight, weeks of premature birth, average birth weight, or sex ratio for all seven groups (P>0.05). A total of nine cases of malformation were observed, with a malformation rate of 1.25% (9/719). In conclusion, different sperm sources and parameters can affect ICSI outcomes before embryo implantation. A full assessment of offspring malformation will require further study using a larger sample size.     

A genetic algorithm for dynamic parameters reverse deduction of integrated anchorage system

1 Introduction The widely used detection methods of anchorage quality in China are mainly on the local anti-pull tests. In recent twenty years, the studies for the non-destructive detection of anchor bar are well developed because of the compactness combi…     

UHF机械调谐器调谐电容片形的程序设计

采用传输线理论可以计算机械式UHF调谐器对应不同频率点的调谐电容量。在进行满足直线频率关系的调谐电容片形设计时,应当求出调谐电容量Cr与旋转角θ的显式函数关系。但对于分布参数的电路,这有一定的困难。本文采用数值计算方法完成了具有良好直线频率跟踪特性的调谐电容片形的设计,并由计算机自动绘出了片形。     

缓和曲线测设参数计算

本文介绍了利用普通小型CASIO fx 4500 P可编程计算器直接在现场计算缓和曲线的测设参数,它具有简便、快速和精度高等特点。     

果蝇DNA和基因间序列的两个信息参数沿染色体分布

以果蝇染色体的全序列和基因间序列作为研究对象.分别用描述序列构成的两个信息参数X和F分析两类序列沿着染色体分布特征,并着重讨论染色体着丝粒及其周围区域的分布规律,用线性拟合和多项式拟合分析染色体各类序列沿染色体的统计分布特征(学生t检验),分析各个参数的平均值在染色体不同区域的分布.     

基于Elman网络的过热汽温隐式广义预测控制

过热蒸汽温度具有时变、大迟延、大惯性的特点,使用传统的PID控制器很难取得满意的效果。针对这一问题,提出了基于Elman网络的过热汽温隐式广义预测控制系统。采用Elman网络作为被控对象的预测模型,在求解最优控制增量时直接辩识控制器的参数,使得对象的建模方便而且控制系统的在线计算量小。仿真结果表明,此控制系统具有优良的控制性能。     

不确定变形耦合发电机系统的参数辨识与自适应同步

研究了不确定变形耦合发电机系统的自适应同步和参数辨识,设计了自适应控制器和参数更新规则,理论证明了该控制器可使得两个变形耦合发电机系统——驱动系统和未知参数的响应系统渐进地达到同步,并且可以辨识出响应系统的未知参数.数值模拟结果证明了该控制器的有效性.     

自适应预测参数分析

通过试验对影响算法收敛性的参数进行研究,合理选取参数提高自适应预测器的精度。试验对语音信号进行LPC分析得到的AR（2）信号为预测器输入,MATLAB仿真构造自适应线性预测器,采用LMS算法进行训练。试验表明,输入信号特征值的分散度越大,其收敛性越差。自适应预测试验验证了自适应预测过程参数分析选取的有效性。     

Experimental study on visco-elastic constitutive relationship and its parameters for geogrids

1 Introduction 1 The sheet type geogrids, which are characterized by grid structures with apertures of (10 to 100) mm between longitudinal and transverse ribs respectively are made from pre-extruded high density polyethylene sheets by punching and drawing process, and the drawing process forms the structures of grid and enhances the tensile strength of geogrids to a grea extent. Since the geogrids possess high tensile strength in nature, they are widely used as reinforcement in segmental retai…     

相对论性等离子体中平均洛仑兹因子

文章给出入射激光强度与电子洛仑兹因子的关系,然后根据统计力学的方法,导出相对论等离子体中平均洛仑兹因子与温度参量之间的关系,同时利用数值计算得到其关系曲线和拟合函数.