On the other hand, pEHVR at TRMA could not provide the correct second peak frequency at around 4 Hz, although the overall amplitude in the high frequency range becomes closer to the EHVR than that of MHVR is.
Aluminium alloy 2024-T351 is tested at approximately 20 kHz with variable amplitude in the high cycle fatigue (HCF) and very high cycle fatigue (VHCF) regime at load ratios R = −1, R = 0.1 and R = 0.5.
To determine the electrical conductivity of low-melting electrolytes (AlF3-rich, e.g. NaF/AlF3 molar ratio = 1.2), a tube-type cell was used, applying ac-techniques with a sine wave signal with small amplitude in the high frequency range.
The local area of influence of an AE-type GIC with large-amplitude dB/dt can extend to a latitude 20° lower than the equatorward boundary of the auroral oval, even though the dB/dt amplitude is only an order of magnitude smaller than its amplitude in the high latitudes (Ngwira et al. 2013, 2014).
However, not as expected, the peak and trough amplitudes in the higher frequency range increase strongly at the same time.
We show evidence of a departure of the distribution of VLF noise amplitudes in the high-resolution time series produced for the model from the lognormal form assumed by many authors and in the design of the present instrument.
The main consequences of defocusing are the lack of frequency information around the zero transitions of the CTF in the imaged object, the inversion of phases in some regions of the reciprocal space, and a rapid decrease of the Fourier amplitudes in the high spatial frequency region.
It can be seen that the dynamic vertical load generated in the low rail presents an oscillatory behavior with higher amplitude than in the high rail (no corrugated).
Therefore, ROTI can be considered an effective indicator of the occurrence of both phase fluctuations and amplitude scintillation in the high latitude ionosphere.
This relation indicates that source amplitudes estimated in the high-frequency band can be used to quantify event size.
