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This article aims to present for the video version or not, in a clear and objective way to use the teaching language that is being used for teaching musical guidance and practice to play guitar. It is a great increase in the use of mobile devices and its use in the education approach. The proposal of this article is the development of a mobile application for the Android operating system, which is intended to conduct a self-directed study on this subject. The audio recording will be used in the Fourier Transform, thus determining the frequency of musical notes played by the user. [ABSTRACT FROM AUTHOR]

This paper presents a mathematical analysis of the signal waves of the vibration caused by the implosion of water bubbles during the fluid flow in water ducts of greater size. Therefore, the main purpose of this study was to identify the duration and the frequency of such vibrations, which are important for the study of the phenomenon of bubble implosion due to its consequences. The methodology consisted of using signal analysis techniques like the analysis of the original signal by Fourier transform and the power spectrum to distinguish the frequency of the pulses of noise peaks. The signal spectrogram helped to define the temporal location, by using different parameters, raising its temporal resolution. For the temporal determination of pulses it was used a low-pass filter around every determined frequency in Fourier transform. We concluded that summing up all signal filtered components resulted in an approximation of the original signal without noises. [ABSTRACT FROM AUTHOR]