弦理论最初是为了解释强相互作用力，也就是二次共振模型（1969）。
The theory has its origins in an effort to understand the strong force, the dual resonance model (1969).
结果表明，三波共振和二次失稳这两种机制都存在。
The results show that mechanisms of both resonant triad and secondary instability do exist.
研究结果的二次磁共振成像终点一般都符合首先观察终点中出现的好转，这局限于0.5毫克组患者当中。
Results of the study's secondary MRI end points were generally consistent with reductions seen in the primary end point, which was limited to patients in the 0.5-mg group.
本文研究了用与受迫力谐波共振的周期摄动抑制含二次非线性项受迫振动系统中的混沌。
In this paper, suppression of chaos in a forced vibration system with a square term by resonant periodic perturbations is studied.
在三个月后完成接下来的核磁共振成像，然后在第二次过程的三个月后在进行一次核磁共振成像。
Follow-up MRI was done three months after the initial procedure, and again three months after the second procedure.
针对基于AD9874芯片的数字接收机的最小谱宽和谱宽允许设置的数目均不能满足常规临床用磁共振成像技术的要求，本文从软件角度提出了一种扩展数字接收机谱宽的二次抽取算法。
Here we propose a second decimation algorithm for widening the range of sweep width in the AD9874 based digital receiver to meet the sweep width requirement set by the clinic imaging pulse sequences.
针对基于AD9874芯片的数字接收机的最小谱宽和谱宽允许设置的数目均不能满足常规临床用磁共振成像技术的要求，本文从软件角度提出了一种扩展数字接收机谱宽的二次抽取算法。
Here we propose a second decimation algorithm for widening the range of sweep width in the AD9874 based digital receiver to meet the sweep width requirement set by the clinic imaging pulse sequences.
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