Results 31 to 40 of about 8,522 (72)

Design and Verification of Sector Vortex Archimedean Spiral Phased Array Transducer for Improving Focus Acoustic Pressure

open access: yesArchives of Acoustics
The emergence of high-intensity focused ultrasound applications brings great potential to establish noninvasive therapeutic treatment in place of conventional surgery.
Xiaodan LU, Deping ZENG
doaj   +1 more source

Modelling the Acoustic Properties of Baffles Made of Porous and Fibrous Materials

open access: yesArchives of Acoustics
The research described in the article addresses the problem of measurement, prediction and practical use of the acoustic properties of materials determined in an impedance tube.
Krzysztof KOSAŁA
doaj   +1 more source

Attenuation Characteristics of Vibration in a Locally Resonant Phononic Crystal Frame Structure

open access: yesArchives of Acoustics, 2020
In this paper, a frame structure based on the locally resonant (LR) mechanism of phononic crystals (PCs) is designed on account of the wide application of frame structures in high-rise buildings, and the band structures, displacement fields of eigenmodes,
Yukun WANG   +3 more
doaj   +1 more source

Reference Question Data Mining [PDF]

open access: yes, 2010
This exploratory study investigated the feasibility of using reference questions as an important tool in the construction of study guides, instructional outreach, and collection development at a small, four-year university in Lake Charles, Louisiana. The
Finnell, Joshua, Fontane, Walt
core   +1 more source

Application of a Phase Resolved Partial Discharge Pattern Analysis for Acoustic Emission Method in High Voltage Insulation Systems Diagnostics

open access: yesArchives of Acoustics, 2018
An alternative method for analysis of acoustic emission (AE) signals generated by partial discharges (PD), based on a correlation between voltage phase run and AE pulses, so called phase resolved PD pattern (PRPD), is presented in the paper. PRPD pattern
Michał KUNICKI, Andrzej CICHOŃ
doaj   +1 more source

Acoustic Analysis Using Sound Level Meter to Determine the Period of Usage of the Spindle Bearing of a Radial Drilling Machine

open access: yesArchives of Acoustics, 2019
The condition monitoring techniques like acoustic emission, vibration analysis, and infrared thermography, used for the failure diagnosis of bearings, require longer processing time, as they have to perform acoustical measurement followed by signal ...
S. CHARLES, Joslin D. VIJAYA
doaj   +1 more source

Sound Behaviour of Concrete Churches. The Church of Santa Cruz de Oleiros

open access: yesArchives of Acoustics, 2018
The church of Santa Cruz de Oleiros, Spain (1967) shows architect Miguel Fisac’s perception of sacred space after the Second Vatican Council. In this place of worship, the architect responded to the new liturgical guidelines combining geometry and ...
Ana María BUENO   +2 more
doaj   +1 more source

The Influence of a Single Therapeutic Dose of Methadone on Selected Auditory Functions in Patients Addicted to Opioids and Undergoing Substitution Therapy – a Preliminary Study

open access: yesArchives of Acoustics, 2018
The main purpose of this research was to determine the influence of a therapeutic dose of an opioid drug (methadone) on selected auditory functions in patients addicted to opioids (recognition ICD-10; F11) and undergoing substitution therapy.
Emilia TARNOWSKA   +3 more
doaj   +1 more source

Speech Enhancement Based on Discrete Wavelet Packet Transform and Itakura-Saito Nonnegative Matrix Factorisation

open access: yesArchives of Acoustics, 2020
Nonnegative matrix factorization (NMF) is one of the most popular machine learning tools for speech enhancement (SE). However, there are two problems reducing the performance of the traditional NMFbased SE algorithms.
Houguang LIU   +5 more
doaj   +1 more source

Local Fault Assessment in a Helical Geared System via Sound and Vibration Parameters Using Multiclass SVM Classifiers

open access: yesArchives of Acoustics, 2016
A gear system transmits power by means of meshing gear teeth and is conceptually simple and effective in power transmission. Thus typical applications include electric utilities, ships, helicopters, and many other industrial applications.
Muniyappa AMARNATH
doaj   +1 more source

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