While the evidence of boundary-layer instability waves is captured in the present result, the most amplified frequency in the boundary shear layer does not necessarily agree with the primary frequency of a trailing-edge noise, when wake instability is dominant in laminar flow.
The primary frequency of the photodetector signal that is required for evaluation of the local velocity, was determined unambiguously by a frequency-domain Fast Fourier Transform analysis of the velocity signal.
Clinical characteristics included family history of breast cancer, having a primary physician, frequency of visit to the primary physician, frequency of physician breast examination, and frequency of breast-self-examination.
No meaningful differences could be observed in the frequency regions using different quality pressure sensors because the approach using Student's t-distribution focuses on the sharp energy increase produced by the primary frequencies of the power spectrum.
The results indicate that the device has a primary resonance frequency of 330 MHz, and for a gap (distance between permanent magnet and coil) of 1.5 nm, the nano device is able to provide 1.7 and 2.24 mW/cm3 for linear and nonlinear cases respectively.
The aim of this paper is to present a linear quadratic Gaussian (LQG) controller designed with two main objectives: to allow the contribution of wind turbines (WTs) to the primary frequency regulation of an island power system, and to reduce the WTs drive-train mechanical stresses.
At first, we estimated the primary frequency band of interest using a relaxation time of targeted molecule via the Stokes-Einstein-Debye equation.
Because of the limitation of energy storage capacity, this control strategy is only suitable for the primary frequency regulation of an interconnected system.
Table 1 The first seven primary frequency components of (U^{(1)}) and corresponding periodicities (in year) of the Sun (Polygiannakis et al.
A WTG's primary frequency regulation resembles that of a conventional generator, which is usually activated within a few tens of seconds and sustained for up to 15 min once the grid frequency deviation exceeds the allowable threshold [67].
