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Mohr GC, Cole JN, Guild E, von Gierke HE (1965) Effects of low frequency and infrasonic noise on man. Aerospace Med 36(9):817–824 Understanding the mechanisms or processes for the physical bases for the threshold of 20 μPa for hearing could be useful. The human being is a physical system (Persinger 1980) that can be defined as a volume of colloidal (aqueous) suspensions surrounded by a semipermeable boundary (the skin) and reinforced by calcium salts (bones). The thresholds for the detections of forces and energies should be determined by these constituents. Consequently, it is not surprising that the product for the density of water (10 3 kg m −3) and the square of the multiplication of the average Rohracher displacement (5 × 10 −6 m) and its intrinsic median variation (10 Hz or s −1) is ~2.5 × 10 −6 Pa. If the pressures were greater, we could potentially begin to “hear” or at least “feel” the vibrations of our own body.
Koenig HL, Krueger AP, Lang S, Soenning W (1981) Biological effects of environmental electromagnetism. Springer, Berlin Zasky, Jason. "Return to Dead Mountain— Kármán vortex street, infrasound at Dyatlov Pass". failuremag.com . Retrieved 13 July 2020. Alves-Pereira M (1999) Extra-aural noise-induced pathology: a review and commentary. Aviat Space Environ Med 70:A7–A21
How to Make an Electric Stimulator With Speaker Wires
Fee, David; Matoza, Robin S. (1 January 2013). "An overview of volcano infrasound: From hawaiian to plinian, local to global". Journal of Volcanology and Geothermal Research. 249: 123–139. Bibcode: 2013JVGR..249..123F. doi: 10.1016/j.jvolgeores.2012.09.002. ISSN 0377-0273. For example, Berns et al. ( 1997) showed that small changes in the grammatical structure during reading that were not perceived by participants produced conspicuous local changes in discrete subsurface structures such as the anterior cingulate that is associated with emotional bonding and affect. Hoshiyama et al. ( 2003) demonstrated “subconscious” responses within the right hemisphere during the presentation of facial patterns even when the stimuli were presented for “subliminal” durations or once every ~2 s (0.5 Hz). In general, a “critical mass” and organization of neurons in the cerebral cortices is required for “awareness” (Fendrich et al. 1992). The brain affects all of the organs and tissue; cerebral changes, even without “awareness,” can determine adaptation. The non-specific experiences that include “ill feeling,” malaise, lethargy, low-level nausea, dizziness, mild apprehension, and diminished “concentration” are often reported in the presence of infrasound with or without the “awareness” of its presence. Garstang, Michael (1 January 2010), Brudzynski, Stefan M. (ed.), "Chapter 3.2 - Elephant infrasounds: long-range communication", Handbook of Behavioral Neuroscience, Handbook of Mammalian Vocalization, Elsevier, vol.19, pp.57–67 , retrieved 27 January 2020 You will want to find powerful amplifiers. We chose two livesound amplifiers. Each channel was 500watt amplifier and switch to serial mode to which collectively made one amplifier a mono 1000 watt amplifier.
The precision of description and the prediction of characteristics of phenomena are strongly dependent upon the instrumentation. As cogently argued by Alves-Pereira ( 1999) and Costelo Branco and Alves-Pereira ( 2004), the average db level that is displayed by most conventional instruments designed to detect sound pressure can underestimate the total potential energy. A measure that reflects frequency distribution (spectra) of the average amplitude of acoustic energy present in the environment, not just what is heard, is essential to understand the biobehavioral impact.Cherry N (2002) Schumann resonances: a plausible biophysical mechanism for the human health effects of solar/geomagnetic activity. Nat Hazards 26:279–331 The speakers used are specifically “woofers” to enable the handling of the produced low frequencies (infra-level) efficiently. Preferably use 12-inch models with 40 watts of power handling capacity. The pipes also need to be of the same diameter. Holz EM, Glennon M, Prendergast K, Sauseng P (2010) Theta-gamma phase synchronization during memory matching in visual working memory. NeuroImage 52:326–335 Evces CR, McElhaney JH (1971) Some effects of drugs on the low frequency whole body vibration of dogs. Aerospace Med 42(4):416–428 Many simple oscillator circuits have already been discussed here at Bright Hub, so you may choose any one of them to generate and feed the specified frequency of around 15 Hz to the above amplifier inputs. The information regarding various oscillator circuits are provided at the end of this article.
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