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6.545  Articles
1 of 655 pages  |  10  records  |  more records»
The following work presents a methodology to optimize the absorption coefficients, conventionally considered as the main input parameters of room acoustical simulators. In the first place a presentation of the main characteristics of the acoustic simulato... see more

The absorption performance of a locally-reacting acoustic metamaterial under oblique incidence is studied. The metamaterial is composed of a slotted panel, each slit being loaded by an array of Helmholtz resonators. The system is analytically studied usin... see more

When studying the temperature dependences of the acoustic absorption and the modulus of elasticity, absorption peaks are often observed, which correspond to the characteristic step on the temperature dependence of the modulus of elasticity. Such features ... see more

The detection of underwater objects is one of the most critical technologies, and there have been constant efforts for developing sophisticated sonar systems in naval warfare. Against such efforts, the countermeasure of hiding underwater vehicles, equipme... see more

Corn stalk is considered as agricultural by-products that is abundance and easy to obtain in Indonesia. Corn stalk is an agricultural by-product that highly potential to be exploited as raw material for particleboard production. The research was aimed to ... see more

Flexible polyurethane (PU) foams with varying polyethylene fiber contents were synthesized to improve their acoustic performances. The purpose of this study was to investigate the effects of different polyethylene fiber contents of the PU foams on the res... see more

The examination of the acoustic characteristic of rice bran has been performed. The materials are the alternative materials of the noise controllerfrom the use of synthetic fiber materials like glasswool. The examination is completed by using tube impedan... see more

Water in plant xylem is often superheated, and therefore in a meta-stable state. Under certain conditions, it may suddenly turn from the liquid to the vapor state. This cavitation process produces acoustic emissions. We report the measurement of ultrasoni... see more

Relevance. The problem of controlling complex technological machines such as machines with mechanisms based on kinematics withparallel structure is given consideration in the article in order to improve accuracy of positioning of actuators, to ensure thei... see more

1 of 655 pages  |  10  records  |  more records»