Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 6 of 6 for “"Absorptive material"”.
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Acoustic and non-acoustic performance of coal bottom ash as sound absorptive material for reducing railway noise level
… be classified as Class D (absorption). Class D materials are able to absorb more than 30% of sound by conducting impedance tube and reverberation time. In addition, the Noise Reduction Coefficient (NRC) performance for CBA concrete addresses more than 35% of the absorbed railway sound. CBA …
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Analysis of volatile organic compounds (VOCs) in soil via passive sampling : measuring partition and diffusion coefficients
… water. Passive sampling for soil vapor takes an absorptive material and places it underground for a period of time to allow the VOCs to diffuse into the absorptive materials. In this report, I use low density polyethylene (PE) as the absorptive material and determine two key parameters for …
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Cladding Protection of Reinforced Concrete Structural Members against Blast Loading
… become more and more significant. As an energy absorptive material, aluminium foam has been introduced to be a sacrificial cladding on structures. This thesis aims to discover the protective effect of aluminium foam on reinforced concrete (RC) structural members which has been a common …
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Application Of Absorptive Treatments On Traffic Noise Barriers In Florida
… to single and parallel barriers and the use of absorptive treatment. Database was developed from the data collected from previous research efforts was used to generate a best fit equation model that can be used as a predetermining tool to determine the magnitude of parallel barrier insertion …
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Acoustical characteristic of empty fruit bunch (EFB) fibre with influence of sodium hydroxide treatment time and decay lifespan
… well as to implement the sustainability of the materials. However, the natural fibre also has its own disadvantage which is the ability to maintain the quality of absorption due to the lack of information and research on the acoustic application. Thus, in this research, the untreated and treated …
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Implementation of Refractory Foam Technology for Silencing Small IC Engines
… use of refractory foam, a new class of porous material, for designing effective silencers for small IC engines. The solution must be lightweight, compact, conformable, and capable of handling the rigors of flight. Throughout the course of this research, many silencer designs were fabricated to …