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).
我们知道对大多数人来说，他们的共振频率介于每分钟4.5次至7.5次呼吸之间。
We know that for most people their resonant frequency is between 7.5 and 4.5 breaths per minute.
那请恕我直言：你想要一个给这三位专家推荐，一次核磁共振检查，还有你在电视上看到的治疗和一个小时的访问。
So let me get this straight: you want a referral to three specialists, an MRI, the medication you saw on TV, and an extra hour for this visit.
然后再让他们在睡眠实验室中按照其喜欢的睡眠模式过两晚，期间每天让他们在功能核磁共振成像扫描仪中接受两次认知测试。
Then subjects spent two nights in a sleep lab, where they again followed their preferred sleep patterns and underwent cognitive testing twice daily while in a functional MRI scanner.
由布莱特领导的研究小组使用磁力共振绘图法，得到了12个人在参加一次赌博游戏中大脑的反应曲线。
The research team led by Breiter used magnetic resonance imaging to map the brain responses of 12 men while they participated in a game of chance involving winning or losing money.
“我有点担心，”医生说，“我会尽快安排一次脑部核磁共振成像检查。”
"I'm concerned," the doctor said. "I'm scheduling a brain M."R.I..
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.
次声的作用机理是生物共振，次声应用于生物医学，前景将会十分广阔。
Being inaudible and with a mechanism of bio-resonance, infrasound has a brilliant perspective when applied to biomedicine.
使光学速调管第二段波动器的磁场参数与光场的高次谐波共振，与对称光学速调管情况相比，可使产生的相干谐波辐射强度提高。
Making the second section undulator of optical klystron resonant with the higher harmonic of the laser, the harmonic emission can be enhanced.
这是第一次将“挠度共振”现象与神经网络相结合运用到桥梁检测系统中。
This is the first time to integrate the "deflection resonance" phenomenon with the neural network in the bridge detection system.
本文采用改进的L -P法研究梁的强非线性振动，分析了超谐波共振和次谐波共振两种情况。
The modified Lindstedt-Poincaé method(MLP) is used t analyze strongly nonlinear vibration of beams. Attention is focused on the superhamonic and subharmonic resonances.
对26例次的关节镜结果和28例次的磁共振成像结果进行分析。
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.
研究结果发现，组合共振区域内发生两种不同的拟周期运动和组合周期运动，而且第一振型次谐波共振曲线延伸到组合共振区域。
The results obtained show that several motions may occur in the region of combination resonance, including two kinds of quasi-periodic vibrations and combined periodic motion.
建立了振动压路机跳帧的动力学模型，研究了跳振时振动压路机的非线性动力学特性，选取次谐波共振为跳振的主要特征。
The dynamical model of jump vibration is built, the nonlinear dynamical characteristic of jump vibration is studied and find the sub-harmonics vibration is main characteristic.
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.
核磁共振磁力仪第一次进入航空勘测是在五十年代中期。
The nuclear-magnetic-resonance magnetometer first went into service in airborne prospecting during the middle 1950s .
“我有点担心，”医生说，“我会尽快安排一次脑部核磁共振成像检查。”
"I'm concerned," the doctor said. "I'm scheduling a brain M. R. I. Immediately."
应用多尺度法求得了系统主共振情况的一次近似解，并进行了数值计算。
By means of the method of the multiple scales the first approximate solution of the primary resonance of the system is acquired, and numerical calculation is carried out.
在分析与探讨脉动轴向力作用下梁的参数共振问题时，本文取四种边界条件来分析第二阶次谐波参数共振的稳定区域，确定了零解与非零解的稳定性。
This paper investigates the subharmonic parametric resonance problems of a symmetric orthotropic laminated rectangular plate with simply supported edges by the use of the singularity theory.
“水晶共振”次谐波频率的石英水晶。
The Crystal Resonator". A subharmonic of the frequency of quartz crystal."
“水晶共振”次谐波频率的石英水晶。
The Crystal Resonator". A subharmonic of the frequency of quartz crystal."
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