Results 21 to 30 of about 4,178,499 (306)
The vibroacoustical indexes of the internal combustion engine when the mass of the details of the crankshaft device varies [PDF]
Transport, 2002 The vibroacoustical indexes of the internal combustion engine retrogress when the mass of the details of the crankshaft device increases. The blatancy of sound pressure, oscillation speed, the whole engine increase very fractionally when mass increases ...
E. Juodzevičius, V. Valiūnas
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Sound Pressure Correlates of the Second Heart Sound [PDF]
Circulation, 1974 The sound pressure correlates of the second heart sound were studied in 22 patients during diagnostic cardiac catheterization. Simultaneous right ventricular and pulmonary artery pressures were recorded with equisensitive catheter-tip micromanometers together with the external phonocardiogram and ECG. In 12 patients having normal pulmonary
J A, Shaver +6 more
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Force and Sound Pressure Sensors Used for Modeling the Impact of the Firearm with a Suppressor
Applied Sciences, 2020 In this paper, a mathematical model for projectiles shooting in any direction based on sensors distributed stereoscopically is put forward. It is based on the characteristics of a shock wave around a supersonic projectile and acoustical localization ...
Jaroslaw Selech +7 more
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Noise from mechanical ventilation systems in residential buildings [PDF]
E3S Web of Conferences, 2023 Modern people spend up to 90% of their time indoors. Therefore, the research aimed to identify noise sources from engineering equipment, and developing recommendations for their elimination was an urgent scientific task.
Abramkina Darya
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Sound-Pressure Correlates of the Aortic Ejection Sound [PDF]
Circulation, 1969 The sound-pressure correlates of the aortic ejection sound (AES) were studied in six patients without aortic valve disease (group 1) and in nine patients with valvular aortic stenosis (group 2) during diagnostic left heart catheterization. Aortic root sound and pressure events were recorded by a catheter-tip micromanometer simultaneously with the ...
A V, Whittaker +3 more
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Physical Review, 1920 The Pressure of Sound: Relation between Pressure and Energy Density.—An argument is given, following a method used by Larmor, to show that a certain general type of radiation will exert a pressure. The pressure of small sound waves is found to agree with this result, but for finite waves the conditions for the application of the argument are not ...
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Diagnosis of Noise Inside Neonatal Incubators under Free-Field Conditions
Acoustics, 2023 The study aims to diagnose the sound pressure levels inside incubators in a controlled environment under free-field conditions. The tests were carried out in a semi-anechoic room under the standard UNE-EN ISO 3745:2012/A1:2018 in three different ...
Francisco Fernández-Zacarías +3 more
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Sound pressure level in a municipal preschool [PDF]
International Archives of Otorhinolaryngology, 2014 To evaluate the sound pressure level to which preschool students are exposed. This was a prospective, quantitative, nonexperimental, and descriptive study. To achieve the aim of the study we used an audio dosimeter. The sound pressure level (SPL) measurements were obtained for 2 age based classrooms. Preschool I and II.
Kemp, Adriana Aparecida Tahara +4 more
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Advances in Mechanical Engineering, 2015 Porous metal materials are widely used in noise control with high sound pressure applications such as aircraft engine liners and combustion chambers for rocket engines due to their excellent performance of sound absorption characteristics and ...
Xiaopeng Wang +3 more
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Concise review: aerodynamic noise prediction methods and mechanisms for wind turbines
International Journal of Sustainable Energy, 2023 Wind power plants are increasingly being installed across the world to combat energy deficits and climate change. One of the policy constraints for installing wind turbine plants is acoustic emissions from blades during operation. In this work, a concise
Vasishta Bhargava Nukala +1 more
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