wave attenuator Articles
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Split-Hopkinson Pressure Bar Testing of Unsaturated Sand
High amplitude, split-Hopkinson pressure bar (SHPB) laboratory tests were conducted on compacted specimens of 50/80 silica sand to evaluate the influence of saturation on compressional-stress wave velocity, stress transmission, and attenuation. Stress wave velocity and transmitted stress increase as the saturation increases from 0 to 30 to 40% for constant input stress and constant dry density. ...
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Ultrasonic Characterization of Porosity In Powder Metals
Abstract We present preliminary results of a project aimed at investigating ultrasonic techniques to measure the bulk density, pore size, and spatial variation of porosity in powder metal specimens. Specific techniques considered are ultrasonic wavespeed, attenuation and wave dispersion measurements, and the identification of spectral features in the amplitude spectra. Also discussed is the ...
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Acoustic cleaning system for electrostatic precipitator of 600MW boiler
Summary: in this article, we give analysis to the design and model selection of acoustic cleaning system for the ESP (electrostatic precipitator) of 600MW boiler fire by lignite. We come up with the design & operation parameter for acoustic cleaning system. This article provides reference for successful application of sonic horn to remove soot deposit in ESP. 1. Case Description In this case, ...
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Comparison of profiling results of attenuation and velocity of refracted P-wave in coal-seam
In the paper the problem of effectiveness of seismic profiling of attenuation and velocity of refracted Pwave in coal-seam along mining excavation in conditions of coal-seam edge impact has been presented. For practical use of seismic attenuation profiling, special measurement and interpretation methodology has been prepared. The measure of calculated attenuation is the value of attenuation ...
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Sea Level Rise: Risk and Resilience in Coastal Cities
Introduction One of the most dire impacts of anthropogenic climate change is a rise in the global sea level caused by the melting of glaciers and land-based ice caps, as well as a smaller increase from expansion due to the higher temperature of the water itself. Unlike some other predicted effects of climate change, this impact has already been observed for some time. Indeed, not only is there ...
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Greenville Utilities Commission - Optimizing Pressure Transient Monitoring With Data-Driven Monitor Placement - Case Study
The Greenville Utilities Commission (GUC) provides electric, water, sewer, and natural gas services to more than 135,800 customers in Greenville and across Pitt County, North Carolina. The utility’s distribution network is composed of approximately 70% polyvinyl chloride (PVC), 20% asbestos-cement (AC) and 10% cast iron pipelines. Providing a reliable supply of water while effectively ...
By Syrinix Ltd
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Blast wave characteristics and its influence with distance of measurement
Extraction of locked-up coal pillars by opencast method and the presence of dwellings in proximity to excavation area lead to specialised drilling and blasting plan for safety of structures and humans. Introduction of improper bench layout, mismatched drilling equipment and blast geometry enhances discomfort for local inhabitants. Blast-induced vibration magnitude also shows poor attenuation rate ...
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Contrasting suspended covers reveal the impact of an artificial monolayer on heat transfer processes at the interfacial boundary layer
The highly variable performance of artificial monolayers in reducing evaporation from water storages has been attributed to wind speed and wave turbulence. Other factors operating at the interfacial boundary layer have seldom been considered. In this paper, two physical shade covers differing in porosity and reflectivity were suspended over 10 m diameter water tanks to attenuate wind and wave ...
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Ultrasonic Sensors: Range Vs Frequency
Ultrasonic sensors are pretty cool. Transducers send and receive waves, measurements magically get spit out by the sensor, and nothing had to touch anything, right? You can choose sensors based on range, or type of transducer, or even safety ratings. Most sensors declare their range and frequency together, which seems kind of odd. Why is the range of an ultrasonic sensor tied to its frequency? ...
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