Results 71 to 80 of about 142,451 (184)

Sound radiation from a perforated unbaffled plate

, 2007
A model to calculate the sound radiation from an unbaffled perforated plate is proposed. This is achieved by modifying an existing model of an unbaffled plate to include the effect of perforation in terms of a continuously distributed surface impedance ...
Putra, A., Thompson, D.J.
core  

On the determination of the boundary impedance from the far field pattern

, 2009
We consider the Helmholtz equation in the half space and suggest two methods for determining the boundary impedance from knowledge of the far field pattern of the time-harmonic incident wave.
Godin, Yuri A., Vainberg, Boris
core   +1 more source

Experimental Study on Damage Detection in ECC-Concrete Composite Beams Using Piezoelectric Transducers

Sensors, 2019
The use of engineered cementitious composite (ECC) has attracted extensive attention in recent years because of the highly enhanced ductility owing to its unique strain-hardening behavior.
Fengjiang Qin, Zhigang Zhang, Bo Xie, Rui Sun   +3 more
doaj   +1 more source

Half-Space Sound Field Reconstruction Based on the Combination of the Helmholtz Equation Least-Squares Method and Equivalent Source Method

Sensors
In practical conditions, near-field acoustic holography (NAH) requires the measurement environment to be a free sound field. If vibrating objects are located above the reflective ground, the sound field becomes non-free in the presence of a reflecting ...
Laixu Jiang, Yingqi Xi, Yingying Hu, Guo Wang, Jingqiao Liu   +4 more
doaj   +1 more source

Enhancement of the Electrocatalytic Activity of Conducting Polymer/Pd Composites for Hydrazine Oxidation by Copolymerization

International Journal of Electrochemical Science, 2017
Poly(ANI-co-Py)/Pd composite was prepared by electrochemical polymerization from a mixed monomer solution in 0.5 M LiClO4/acetonitrile. The prepared composite was investigated as a catalyst for the electrooxidation of hydrazine by cyclic voltammetry (CV)
Shimaa M. Ali, Khadija M. Emran, Hamedh A. Al lehaibi   +2 more
doaj   +1 more source

Phasor-Based Assessment for Harmonic Sources in Distribution Networks [PDF]

, 2020
Phasor-based interdependencies of multiple harmonic sources, especially Distributed Energy Resources, on distribution networks are analyzed in this paper. A new index, Phasor Harmonic Index (IPH), is proposed by the authors.
Arghandeh, R., Broadwater, R. P., Centeno, V., Cheng, D., Jung, J., Onen, A. Onen   +5 more
core  

Construction of surface hydrological linkage index based on landscape pattern and process

Meitan xuebao
Under the high-intensity disturbance of human activities such as resource development and land use, landscape patterns and topography are substantially altered, thereby influencing surface hydrological connectivity and processes among ecological units ...
Shaogang LEI, Chunhui HU, Haoyu SUN, Lixiang JIANG, Jianying ZHANG   +4 more
doaj   +1 more source

Numerical simulations for matter transport by the interaction between bubbles and pressure waves near tissue boundaries

Journal of Fluid Science and Technology
The interaction between bubbles and tissues (bone and fat) in ultrasound and the mechanism of drug transport accompanied by bubble collapse were investigated numerically by using the ghost fluid methods with zonal grids.
Hisayoshi MURASAWA, Ryotaro KAMEDA, Hiroyuki TAKAHIRA   +2 more
doaj   +1 more source

Design of multi-layered porous fibrous metals for optimal sound absorption in the low frequency range

Theoretical and Applied Mechanics Letters, 2016
We present a design method for calculating and optimizing sound absorption coefficient of multi-layered porous fibrous metals (PFM) in the low frequency range.
Wenjiong Chen, Shutian Liu, Liyong Tong, Sheng Li   +3 more
doaj   +1 more source

Ferromagnetic Wires Composite Media with Tunable Scattering Spectra at Microwaves

, 2006
We demonstrate composite media with ferromagnetic wires that exhibit a frequency region at the microwave regime with scattering spectra strongly dependent on an external magnetic field or stress.
A. P. Zhukov, C. Garcia, D. Hull, D. P. Makhnovskiy, D. P. Makhnovskiy, G. H. Bryant, J. Gonzalez, J. M. Ziman, L. V. Panina, L. V. Panina, M. Born, S. I. Sandacci, T. K. Chang   +12 more
core   +1 more source