Results 21 to 30 of about 749,140 (312)
Issues for computer modelling of room acoustics in non-concert hall settings [PDF]
, 2005 The basic principle of common room acoustics computer models is the energy-based geometrical room acoustics theory. The energy-based calculation relies on the averaging effect provided when there are many reflections from many different directions, which
C. I. Chessell +3 more
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Measurement of impulse noise propagation over natural impedance surfaces [PDF]
The Journal of the Acoustical Society of America, 1985 The peak sound pressure level decay with distance of the impulse noise from hand grenade simulators has been measured over the following types of surfaces: water, swamp, rocky ground with small bushes, dead grass with sparse snow cover, and dense evergreen forest. The ground impedance is estimated for each surface using the calculation of R. Raspet. H.
Nelson Lewis, Richard Raspet
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Analytical Expression for Sound Transmission Loss Calculation: An Improvement to the Existing Method after Singh and Katra [PDF]
, 2009 An analytical expression for measuring of sound transmission loss (TL) has been developed by using two microphones, an impedance tube and an impulse sound source as a proposed improvement to the existing procedure after Singh and Katra (1978).
Yahya, Iwan
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Diagnostics of Corrosion Protection Potential for Electric Water Heaters [PDF]
MATEC Web of Conferences, 2019 The paper represents the mathematical model for diagnostics of the corrosion protection potential for the electric water heaters (EWH). The research objectives are the problem of determining the EWH corrosion protection technical condition during its ...
Martynyuk Valeriy +2 more
doaj +1 more source
Full and half-wavelength ultrasonic percussive drills [PDF]
, 2018 Ultrasonic-percussive drills are a leading technology for small rock drilling applications where power and weight-on-bit are at a premium. The concept uses ultrasonic vibrations to excite an oscillatory motion in a free-mass, which then delivers ...
Harkness, Patrick +2 more
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Pulmonary Functions and Inflammatory Biomarkers in Post-Pulmonary Tuberculosis Sequelae [PDF]
Tuberculosis and Respiratory Diseases, 2022 Background Post-tuberculosis (TB) sequelae is a commonly encountered clinical entity, especially in high TB burden countries. This may represent chronic anatomic sequelae of previously treated TB, with frequent symptomatic presentation.
Kumar Shanmugasundaram +3 more
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A Test Method for Acoustic Emission Properties of Natural Cellulose Fiber-Reinforced Composites
Applied Sciences, 2021 To test the acoustic performance of fiber-reinforced composites for replacing wood, an acoustic vibration test method is developed. For evaluation of the test method, composites are manufactured using hemp and ramie embedded in epoxy, through vacuum ...
Fanxizi Liu +5 more
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Resonant pumping in a multilayer impedance pump [PDF]
, 2008 This paper introduces the concept of multilayer impedance pump, a novel pumping mechanism inspired by the embryonic heart structure. The pump is a composite two-layer fluid-filled elastic tube featuring a thick gelatinous internal.
Avrahami, I., Gharib, M., Loumes, L.
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Investigations on the Performance of Various Horizontal Ground Electrodes
Energies, 2021 Experimental work on grounding systems has shown that the characteristics of grounding systems under high impulse conditions are different than those obtained at steady-state conditions.
Hanis Hamizah Hizamul-Din +4 more
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Energies, 2021 Ionisation can occur in the soil when high impulse currents are subjected to grounding systems. This occurrence is generated by a difference in the dielectric strength value between the soil and air voids.
Hanis Hamizah Hizamul-Din +3 more
doaj +1 more source