A novel topological index called Y-index was developed based simultaneously on the bond distance and bond adjacent matrices for a molecular.

基于分子的键距矩阵和键联矩阵提出一种新的分子拓扑指数Y。

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Using a semi-empirical theory, the chemical bond properties of Y-124 superconductor were calculated.

利用一种半经验方法研究了高温超导体Y 12 4的化学键性质。

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By controling the three-dimensional motion of the X-Y table and bond head, precision positioning and desired line-type gold wires can be realized, and an ultrasonic wave bonded method is used.

工作原理是通过X-Y工作台和焊头的三维运动控制，定位并拉出设定的金丝线型，采用超声波热压球焊方法焊接芯片管脚。

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But he said the energy of an X-Y bond is going to be equal to the square root.

但他说ＸＹ键的键能,会等于ＸＸ键与ＹＹ键键能乘积的平方根。

麻省理工公开课 - 固态化学导论课程节选