Results 41 to 50 of about 1,265,505 (345)
A PDMS‐based broadband acoustic impedance matched material for underwater applications [PDF]
Ultrasonics, 2018 HighlightsA composite material that is impedance matched to water is designed and fabricated.Impedance matching is achieved by dispersing subwavelength particles in soft solids.An impedance‐matched material containing TiO2 particles in PDMS is ...
Reine‐Marie Guillermic +3 more
semanticscholar +1 more source
Advanced Engineering Materials, EarlyView.This article presents the design, modeling, and characterization of air‐pressure–actuated programmable vibroacoustic metamaterials (PVAMM). The study focuses on leveraging air pressure to dynamically tune resonance frequencies for effective noise attenuation.
William Kaal +2 more
wiley +1 more source
Advanced Engineering Materials, EarlyView.Four‐point bending tests are conducted in an argon atmosphere on commercial MgO‐C brick grades with and without MgO‐C recyclate from room temperature up to 1300 °C. No detrimental effect of the MgO‐C recyclates on bending strength is found. Instead, a decisive influence of the total carbon content is observed, with lower total carbon contents ...
Alexander Schramm +5 more
wiley +1 more source
Advanced Functional Materials, EarlyView.Biofabrication aims at providing innovative technologies and tools for the fabrication of tissue‐like constructs for tissue engineering and regenerative medicine applications. By integrating multiple biofabrication technologies, such as 3D (bio) printing with fiber fabrication methods, it would be more realistic to reconstruct native tissue's ...
Waseem Kitana +2 more
wiley +1 more source
Journal of Low Frequency Noise, Vibration and Active ControlThe impedance matching is essential in producing high-intensity acoustic waves. This paper studies the impedance calculation methods of modulators and double-chamber Helmholtz resonators based on fluid mechanics, aeroacoustics, and electro-acoustic ...
Baoguo Zhang +6 more
doaj +1 more source
Results in MaterialsTungsten-epoxy composites are often applied as backing layer substrates in piezoelectric-based ultrasonic transducers. Control of its acoustic impedance is crucial to customize the specifications of fabricated ultrasonic transducers, especially for ...
Darmawan Hidayat +3 more
doaj +1 more source
A Perforated Plate with Stepwise Apertures for Low Frequency Sound Absorption
Applied Sciences, 2021 A perforated plate with stepwise apertures (PPSA) is proposed to improve sound absorption for low frequencies. In contrast with an ordinary perforated plate with insufficient acoustic resistance and small acoustic mass, the perforated plate with stepped ...
Xin Li, Bilong Liu, Chong Qin
doaj +1 more source
Determining acoustical directionality in an impedance tube using multiple fixed microphones [PDF]
, 2011 Acoustic impedance of a port or object is a valuable piece of knowledge describing how well sound is transmitted or reflected. The commonly used slotted-line method is labourious and time consuming, requiring manual movement to find the maxima and minima
Bodman, Kerry +2 more
core +1 more source
Surface Impedance Determination via Numerical Resolution of the Inverse Helmholtz Problem
, 2017 Assigning boundary conditions, such as acoustic impedance, to the frequency domain thermoviscous wave equations (TWE), derived from the linearized Navier-Stokes equations (LNSE) poses a Helmholtz problem, solution to which yields a discrete set of ...
Gupta P. +5 more
core +1 more source
Advanced Functional Materials, EarlyView.A vertically stacked, DEA‐driven photonic array inspired by cephalopod skin, featuring highly crystalline colloidal crystal gels with vivid color, low FWHM and scalability is presented. The multilayer design removes lateral pixel interference, achieving near‐100% fill factor with fully independent RGB actuation.
Maga Kim +11 more
wiley +1 more source