When we make relative measurements on an incoming signal, we use either some part of the same signal or a different signal as a reference. For example, when we make second harmonic distortion measurements, we use the fundamental of the signal as our reference. Absolute values do not come int...
The near infrared (NIR) extends from 14,000 to 4,000 cm−1 (0.7–2.5 μm) and the observed bands consist of overtones and combinations of fundamental mid-IR bands. The near infrared is becoming an important infrared method particularly in quality control. These definitions of the different...
This paper performs a fundamental study of very low frequency oscillations characterized by a common mode shape at all system busses (same magnitude and phase). Also known as global or frequency control oscillation mode (below 0.1 Hz), it determines frequency response performance according to NERC...
1c is a harmonic frequency comb28,29, where the spacing of the strongly oscillating modes, i.e., the repetition frequency, is an integer multiple of fundamental mode spacing. In the present experiment, the repetition frequency of 4 mode spacing was the most stable. The RF frequencies of ...
To confirm the phonon lasing of the fundamental mode and its harmonics, we first measure the steady-state phonon population 〈N〉 = MΩ0〈x2〉/ћ, whereMis the mass of the levitated sphere,Ω0is the oscillation frequency of the mode,xis the centre of mass displacement of the spher...
Optimal design problems of linearly elastic vibrating structural members have been formulated in two ways. One is to minimize the total mass holding the fr... PS Hasleton - 《Journal of Pathology》 被引量: 25发表: 1973年 Fundamental frequency of vibration of a beam on a non-linear elastic...
The "switching off" fundamental mode for high frequency excitations results in characteristic overshoot of the stationary response level by the non-stationary rms response and an amplification of the response in the upper part of the shear beam. 展开 关键词: Seismic engineering Non-stationary ...
The CBS is a compact and robust representation of the fundamental tempo of a piece of music. Tempo analysis with the beat spectrum reveals not only the fundamental tempo but also corresponding tempos with a harmonic and subharmonic relationship to the fundamental tempo (e.g., 1/2-, 1/3-, ...
Coherent frequency conversion of structured light, i.e. the ability to manipulate the carrier frequency of a wave front without distorting its spatial phase and intensity profile, provides the opportunity for numerous novel applications in photonic technology and fundamental science. In particular, freque...
As such, they are fundamental to mode survey testing and the identification of modal parameters. In this section, we will describe the derivation of frequency response functions from response data obtained by exciting the system with external forces, which is the predominant approach. This will be...