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186 articles for “ACO”
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Exploring Adaptive Acoustics for Educational Spaces
Abstract: Acoustics play a major role in educational buildings as these have high density, occupying classrooms, lecture halls, conference rooms, auditoriums, etc., engaged by students for several activities. Due to their multi-functional nature, architectural studios in particular require larger spaces and these often accommodate furnishing such as drafting board/table, screens and podium. The considerable volume of these studios can lead to compromised acoustical comfort, which may result in issues like echoes …
Published in International Journal of Architectural Design and Planning · Vol. 2, Issue 2, 2024 · pp. 18–37 Read article
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Polymer-Based Acousto-Optic Ultrasonic Sensor for Non-Destructive Evaluation of Dielectric Insulation
Abstract: A dual-polymer fiber-optic sensor for monitoring partial discharge (PD) activity in high-voltage polymeric insulation is presented in this work for non-destructive evaluation and dielectric testing applications. Dielectric weakness within polymeric insulation leads to partial discharge activity, generating ultrasonic acoustic waves that propagate through the medium. The developed sensing assembly comprises a conical polymer-based horn that gathers and concentrates the ultrasonic acoustic emission energy generated by dielectric weakness, and a single-mode …
Published in Journal of Polymer & Composites · Vol. 14, Issue 1, 2026 · pp. 11–24 Read article
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Effect of Algal Toxin-Anatoxin on the Growth of Acorus calamus L.
Abstract: AbstractThe growth of Acorus calamus L. in Bheemasandra accession of Tumkur district, Karnataka state was studied. The roots of Acorus calamus L., are used to build immunity in the children. Narayan Das Prajapathi 2003 in his book “A handbook of medicinal plants” reports that, it has a stimulating, nervine and anti-spasmodic properties and acts as a rejuvenative for the brain and nervous system. It is used to promote cerebral circulation. …
Published in Research & Reviews : Journal of Botany · Vol. 4, Issue 1, 2015 · pp. 26–32 Read article
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The Role of Adaptive Filters in Enhancing Acoustic Echo Cancellation Efficiency in Noisy Environments
Abstract: The novel approach that this work discusses is a DCD-based iterative learning filter approach improved with deep learning methodologies, designed to improve the efficiency of acoustic echo cancellation. The proposed system can really manage both linear and nonlinear echo scenarios, dynamically adapting to fluctuating acoustic environments. The above comparative evaluations with standard filter, the standard RLS filter, indicate that the mean square error, and the standard deviation of the correlation …
Published in International Journal of Radio Frequency Innovations · Vol. 2, Issue 2, 2024 · pp. 9–24 Read article
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Dust Acoustic Solitary Waves in a Five Component Plasma-Application to Comets
Abstract: We have studied the characteristics of the Dust Acoustic Solitary Wave (DASW) in a five component cometary plasma composed of two components of electrons (one hotter and one colder), hydrogen ions and a pair of oppositely charged dust particles (heavier ions). The Korteweg – deVries wave equation has been derived for the system and its solitary wave solution obtained. The dust acoustic solitary wave amplitude is almost a constant with …
Published in Research & Reviews : Journal of Physics · Vol. 8, Issue 2, 2019 · pp. 44–51 Read article
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Polymer-Based Acoustic Composite Materials for Urban Noise Mitigation: Design, Performance and Legal Integration
Abstract: This study explores the development and use of polymer-based acoustic composite materials for effective urban noise mitigation, wherein the performance of the materials is linked to legal compliance frameworks. Rapid urbanization has intensified noise pollution from transportation, industrial activity, and construction, posing a serious threat to public health and environmental quality. Although regulatory standards exist, their implementation is often limited due to inadequate technical interventions. This research focuses on advanced …
Published in Journal of Polymer & Composites · Vol. 14, Issue 3, 2026 · pp. 403–412 Read article
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Computational Analysis of Epithelial Stratum and Physical Condition of Human Kidney Cells and Liver Cells Using Non Destructive Testing Technique by Scanning Acoustic Microscope
Abstract: The present work deals with the methodology governing scanning acoustic microscope (SAM) for non-destructive testing of biological samples (liver cells and kidney cells). Acoustic microscopy was performed on liver cells and kidney cells for measuring their thickness and also to determine their shapes. This technique was also used for evaluation of internal damage to cells. SAM images were taken for further qualitative and quantitative assessments. Using the quantitative data obtained …
Published in Research and Reviews : A Journal of Biotechnology · Vol. 5, Issue 1, 2015 · pp. 1–4 Read article
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Excess Acoustical Study of Binary Liquid Mixture with Experimental Parameters at Different Temperatures
Abstract: Excess acoustical parameters such as excess ultrasonic velocity (UE), excess acoustic impedance (ZE), excess Molar Volume (VmE), excess free length (LfE) and excess adiabatic compressibility (bE) have been discussed between the component molecules in terms of their intermolecular interactions of the binary liquid mixture containing Aniline with Toluene from temperatures T = 303.15 to 318.15 K. These excess parameters have been calculated from the values of densities (r), ultrasonic velocities …
Published in Research & Reviews : Journal of Physics · Vol. 8, Issue 2, 2019 · pp. 101–107 Read article
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Formation and Fabrication of A 3D- Printed Polymer Propeller for Improved Propulsion and Minimal Acoustic Emission: A Comparative Study for Small Unmanned Vehicles
Abstract: The current research focuses on a comparative analysis of propeller designs to identify an option that enhances thrust efficiency while minimizing acoustic noise. The study evaluates three distinct types of propellers: the traditional three-blade propeller, the Sharrow propeller, and a novel aero propeller featuring an air foil-shaped cross-section. To facilitate a hands-on analysis, these propellers were produced using 3D printing technology, specifically employing ABS filament through a Fused Deposition Modelling …
Published in Journal of Polymer & Composites · Vol. 13, Issue 2, 2025 · pp. 252–261 Read article
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Acoustic Sensing for City Flow: Quasi-Supervised Recognition of Sirens and Traffic for Urban Mobility Intelligence
Abstract: This paper frames environmental audio as a mobility telemetry source, extending a benchmark urban-sound corpus with transportation-critical classes—ambulance, firetruck, police, and traffic—and training spectrogram-based models under a quasi-supervised regime to support real-time city operations; leveraging 10-fold protocols, class-weighted objectives, and audiospecific augmentations (time stretch, pitch shift, SpecAugment, PatchAugment), the system benchmarks multiple CNN backbones combined with self-supervised learning paradigms enable the extraction of rich, discriminative acoustic representations, achieving strong multi-class …
Published in Trends in Electrical Engineering · Vol. 16, Issue 1, 2025 · pp. 42–50 Read article
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Modeling and Acoustic Analysis of Noise Vibration in Automotive Gearbox by Non-destructive Testing
Abstract: A gearbox is used for transferring power from the engine to the wheels. Predicting the vibration and noise radiation from a dynamic system like a gearbox gives designers an insight early in the design process. It was conducted experimental and modeling of vibration and noise for magnitude and pressure level variations in a Peugeot 206 automotive 5-speed gearbox. It was extract vibration data related to different periodic processing and then …
Published in Journal of Experimental & Applied Mechanics · Vol. 11, Issue 3, 2020 · pp. 54–63 Read article
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Comparative Between (LiNbO3) and (LiTaO3) in Detecting Acoustics Microwaves Using Classification
Abstract: AbstractOur work is mainly about detecting acoustics microwaves in the type of BAW (Bulk acoustic waves), where we compared between Lithium Niobate (LiNbO3) and Lithium Tantalate (LiTaO3), during the propagation of acoustic microwaves in a piezoelectric substrate. In this paper, we have used the classification by Probabilistic Neural Network (PNN) as a means of numerical analysis in which we classify all the values of the real part and the imaginary …
Published in Journal of Microwave Engineering and Technologies · Vol. 5, Issue 3, 2018 Read article
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Effects of Vocal Loading task on Teachers’ voice: Measures of Acoustical, Aerodynamic and Self-Perceptual Vocal Parameters
Abstract: Teachers are susceptible to develop dysphonia due to heavy vocal loading. The study aimed to evaluate teachers’ voice before and after vocal loading task, at the beginning and end of the day. Subjects included 70 female (mean age:34.61 years) and 30 male teachers (mean age:36.80 years) aged 25-40 years, involved in atleast four hours of teaching per day. Based on years of teaching experience, they were categorized into four groups. …
Published in Research and Reviews: A Journal of Health Professions · Vol. 12, Issue 3, 2022 · pp. 22–28 Read article
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Acoustic Logging Methods in Fractured and Porous Formations
Abstract: Abstract Formation fractures have significant importance in the rocks’ permeability of oil and gas reservoirs. In real conditions, the opening of vertical fractures exceeds the opening of horizontal fractures and the permeability of reservoirs in conditions of horizontal wells is higher than in vertical conditions. For the sonic log longitudinal waves, unlike the transverse waves, the attenuation rate strongly depends on the wave path direction. It is shown that the …
Published in Journal of Offshore Structure and Technology · Vol. 4, Issue 2, 2017 · pp. 28–35 Read article
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A Review on Integrated Acoustic Emission and Piezoelectric Sensing for Real-Time Damage Characterization of Polymer Composite-Enhanced Concrete: Advances, Challenges, and Future Perspective
Abstract: Polymer composite reinforced concrete has been identified as an efficient material system that can enhance the mechanical properties, durability, and service life of modern structures. The combination of fiber reinforced polymers (FRPs), polymer modifiers, and hybrid composite reinforcements increases structural effectiveness. However, these systems are still vulnerable to damage processes, including matrix cracking, fiber breaking, interfacial debonding, and delamination. Thus, there is a need for structural health monitoring (SHM) strategies …
Published in Journal of Polymer & Composites · Vol. 14, Issue 3, 2026 · pp. 930–939 Read article
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Acoustic Cue for Stress Perception in Kannada Speaking Children
Abstract: The perception of prosody is necessary to understand the intent of a spoken utterance, especially to appreciate the intricacies of a language. Prosody or the supra-segmental component is made up of stress (accent), intonation and the rhythmic (timing) patterns of language. Stress indicates the most prominent syllable/word in an utterance. Literature suggests language-specific acoustic cues for stress perception. Hence the present study was aimed to determine the major acoustic correlate …
Published in Research and Reviews: A Journal of Neuroscience · Vol. 9, Issue 3, 2019 · pp. 16–23 Read article
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A Ventilated Dual-Function Photonic–Phononic Metasurface for Simultaneous Passive Radiative Cooling and Low-Frequency Noise Mitigation in Building Envelopes: Conceptual Design and Computational Feasibility Analysis
Abstract: Acoustic metamaterials for sound insulation and photonic/radiative-cooling metamaterials for passive thermal management have each matured separately for building-envelope retrofit, but existing studies address ventilation, acoustic damping and radiative thermal control in isolation, and no reported unit-cell architecture co-designs all three within a single shared structure. This gap persists because materials that are acoustic absorptive are generally dense and structurally opaque, whereas materials that are highly solar-reflective are conventionally applied to …
Published in International Journal of Energy and Thermal Applications · Vol. 4, Issue 2, 2026 Read article
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Modelling and finite element analysis of thermo acoustic refrigerator
Abstract: In this work, the standard modified thermo-acoustic refrigerator (TAR) is created. It has a stack, heat exchanger, thermocouple, resonator tube, and an acoustic driver (loudspeaker). The effects of a few design factors were investigated for a thermo-acoustic refrigerator system, including wave patterns, frequency, and heat exchanger. It was discovered that a sine wave pattern produced better cooling results than the other wave patterns examined. The heat exchanger's addition greatly increases …
Published in Journal of Refrigeration, Air conditioning, Heating and ventilation · Vol. 9, Issue 3, 2022 · pp. 31–46 Read article
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OFDM Receiver Design Based on Adaptive Modulation and Channel Estimation for Underwater Acoustic Communication
Abstract: Submerged or under water acoustic communication (UWAC) is an intriguing area in communication research where we can expect to get a high information rate, a high throughput and a low latency which frequently is an exceptionally difficult assignment. In this work, we outline an OFDM receiver system that is reasonable for submerged acoustic communication in view of adaptive modulation and Kalman filter based channel estimation. We have concentrated on the …
Published in Recent Trends in Electronics Communication Systems · Vol. 4, Issue 1, 2017 · pp. 7–16 Read article
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A Study Acoustic Doppler Current Profilers River Survey Measuring Discharge Islah in Dhi Qar Governorate of the Marsh Abu Ziark
Abstract: The use of acoustic Doppler current profilers (ADCPs) from a transferring boat is now in many instances used technique for measuring streamflow. The technology and methods for making ADCP-based discharge measurements are exceptional from the science and techniques used to make ordinary discharge measurements with mechanical meters. Although the ADCP is a precious device for measuring streamflow, it is only correct when used with suitable techniques. This file affords instruction …
Published in Research & Reviews : Journal of Physics · Vol. 9, Issue 1, 2020 · pp. 1–12 Read article