The paper presents the results of experimental studies of the influence of the level of tonal acoustic noise on the times of simple human reactions, such as a simple auditory-motor reaction, a simple visual-motor reaction, a simple tactile-motor reaction, as well as a detection reaction. Experimental studies have shown that during the action of tonal acoustic noise with a frequency of 100 Hz, the subjects experienced an increase in the times of all the simple reactions being analyzed. The effect of tonal noise with a frequency of 100 Hz on the detection response is less pronounced.
The paper presents the results of experimental studies of the effect of acoustic noise of the sound and infrasonic frequency bands on the auditory, visual, motor, tactile responses of a person, as well as on the time of making decisions. A method for estimating the time of human reactions was proposed, which was implemented by the authors as a software application for mobile devices. The obtained results unequivocally show an increase in the reaction time of all types under the influence of sound and infrasound noise even of a small level.
This paper describes the results of experimental study influences of urban planning and green spaces on the acoustic transport noises. The contribution of green spaces to the acoustic noise attenuation is shown.
We present experimental results of the study of acoustic gravity waves and electric field generation during auroras. Vertical component of electric field in the atmosphere surface layer and atmosphere pressure were recorded during the field study. Analysis of the obtained data shows that synchronous variations of the pressure and electric field strength appear with the development of auroras. It is seen that the amplitude of electric field perturbations is approximately proportional to the amplitude of variation in the pressure.
The paper deals with the assessment of the Chelyabinsk meteoroid energy based on long-period infrasonic waves in the atmosphere. A new technique is proposed, which utilizes the integral energy distribution in the power spectrum. The obtained results are in satisfactory agreement with the independent energy estimates.
The article describes the results of studies of infrasound pressure oscillations in the frequency range from 0.0001 to 10 Hz in the suburban area. In this frequency range are analyzed changes infrasonic pressure oscillations infrasonic background in the suburban area. Showing daily and seasonal changes in the infrasound pressure oscillation parameters.
KEYWORDS: Signal analyzers, Wavelets, Wavelet transforms, Signal detection, Acoustics, Signal generators, Protactinium, Atmospheric physics, Chemical analysis, Physics
The paper presents the results of the wavelet analysis of infrasound signals from ground-based low-power explosions. It was found that in most cases, the spectral structure of the infrasound signal has the character of a monotonic decrease of the oscillation period. For these types of signals from the explosion with the power tab order of 0.01 × 10-3 kT at a distance of up to 300 km infrasound signal spectral structure has the character of a linear decrease of the period of pressure fluctuations from time to time according to the law T = Т0 - B × t, where the most probable values of the initial period Т0 take values from 0.97 and index decreasing in the period - 0.25.
The technique of map development of noise of the city on spectral characteristics of acoustic noise is offered. Cards of acoustic noise in the sound range of frequencies for the winter and summer season, and also the card of spatial distribution of a decay rate according to measurements in Tomsk are constructed. Empirical dependence of level of acoustic noise on transport loading for the winter and summer period is received.
The possibility of the estimation of ground explosions energy using infrasound monitoring data for 100-300 km distances is discussed. Infrasonic signals energy from ground explosions is estimated using different methods.
The paper presents the daily variations of the electric field in the period from March 2012 to February 2013, received by the monitoring data in the city of Tomsk. Also in the article the interpretation of the results.
The results of studies on the effects of low-frequency acoustic fields at 10 Hz on electrical activity of a human brain are presented. It has been established that infrasound at the frequency of 10 Hz causes changes in amplitude data of the human EEG.
The possibility of the estimation of ground explosions energy using infrasound monitoring data for 100-300 km distances is discussed. Infrasonic signals energy from ground explosions is estimated using different methods.
The results of experimental studies on the cardiovascular system response to the impact of weak low-frequency acoustic fields using EСG characteristics are presented. The slowing of the heart rate under the impact of frequencies 10Hz and 100Hz is shown.
The technique of mapping urban noise using spectral characteristics of acoustic noise is proposed. The acoustic noise in sound frequency range as well as spatial distribution of the decay rate is mapped using measurement data in Tomsk. The main sources of acoustic noise in the city have been identified. The empirical dependence of acoustic noise level on traffic load has been obtained.
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