Experimental Born-Oppenheimer Potential for the X1Sigma+ Ground State of HeH+: Comparison with the Ab Initio Potential

All literature on vibration-rotational and pure rotational transition energies for the X1Sigma+ state of 4HeH+, 3HeH+, 4HeD+, and 3HeD+ have been employed in a direct least-squares fit of the radially dependent Hamiltonian. The Born-Oppenheimer potential is represented by a modified Lennard-Jones function that provides for correct behavior in the near dissociation long-range region. Only 19 adjustable parameters were required to represent the 166 measured transition energies, which are reproduced almost to within the measurement accuracies. The fitted potential and Born-Oppenheimer breakdown functions are shown to be in good agreement with the results of ab initio calculations. The results are used to obtain high-order centrifugal distortion constants as well as level widths for quasi-bound levels. Copyright 1999 Academic Press.     

六西格玛设计在新产品Q450NQR1开发试制中的应用

阐述了梅钢将六西格玛设计方法引入产品研发的基本想法,描述了六西格玛设计的定义及其作用,在研究了六西格玛设计模型的基础上,结合梅钢材料设计及生产的特点,提出了梅钢DCOV的独特设计模型,并以Q450NQR1新产品开发试制为例,详细介绍了梅钢采用该模型在新品开发中应用的全过程,并验证了有效性。