Results 31 to 40 of about 506,198 (188)

A Study on Frequency Response Functions in Pavement Engineering

open access: yesThe Baltic Journal of Road and Bridge Engineering, 2023
Mechanical impedance (MI) defines the ability of a system to vibrate as a consequence of force application. In the recent years, the correlation of this parameter with tire-road noise and other characteristics has gained certain attention.
Filippo G. Pratico   +3 more
doaj   +1 more source

Analytical Expression for Sound Transmission Loss Calculation: An Improvement to the Existing Method after Singh and Katra [PDF]

open access: yes, 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
core  

Measurement of impulse noise propagation over natural impedance surfaces [PDF]

open access: yesThe 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
openaire   +1 more source

Parameter Estimation of a Grid-Tied Inverter Using In Situ Pseudo-Random Perturbation Sources

open access: yesEnergies, 2023
Inverters are playing an increasingly important role in the electrical utility grid due to the proliferation of renewable energy sources. Obtaining inverter models with accurate parameters is, therefore, essential for grid studies and design.
Ian Paul Gerber   +2 more
doaj   +1 more source

Evaluation of the acoustical performance of louvre by impulse response analysis / [PDF]

open access: yes, 1998
Tese (Doutorado) - Universidade Federal de Santa Catarina, Centro ...
Viveiros, Elvira Barros
core  

Reference values for respiratory system impedance using impulse oscillometry in healthy preschool children [PDF]

open access: yesKorean Journal of Pediatrics, 2011
PurposeThe normal values for lung resistance and lung capacity of children, as determined by impulse oscillometry (IOS), are different for children of different ethnicities.
Jye Hae Park   +8 more
doaj   +1 more source

Time-Frequency Respiratory Impedance Maps Enable Within-Breath Deep Learning for Small Airway Dysfunction Identification. [PDF]

open access: yesBioengineering (Basel)
Small airway dysfunction (SAD) is an early functional abnormality associated with multiple chronic airway diseases. However, clinical assessment often relies on spirometry-based indices, which require forced maneuvers and are sensitive to subject effort,
Zhao D   +9 more
europepmc   +2 more sources

Chromaticity and wakefield effect on the transverse motion of longitudinal bunch slices in the Fermilab Tevatron

open access: yesPhysical Review Special Topics. Accelerators and Beams, 2008
The transverse turn-by-turn evolution of a bunch slice after an impulse kick is examined considering chromatic and impedance effects. It is found that by fitting the envelope of the beam slice motion to simulated data the strength of the resistive wall ...
V. H. Ranjbar, P. Ivanov
doaj   +1 more source

Review of Local Network Impedance Estimation Techniques

open access: yesIEEE Access, 2020
As a result of increasing variability of network impedance, interest in impedance estimation techniques is growing. This review contextualises local impedance estimation techniques by providing a historical prospective on the uses of these techniques ...
Mathieu Kervyn De Meerendre   +5 more
doaj   +1 more source

Response of Drone Electronic Systems to a Standardized Lightning Pulse

open access: yesEnergies, 2021
This paper presents the results of experimental tests of the impulse response of selected, essential components of a drone. A standardized lightning pulse that is often used during immunity tests of electronic devices in the aviation industry was applied.
Paweł Szczupak, Tomasz Kossowski
doaj   +1 more source

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