The electrical equivalent model of an underwater acoustic transducer must be exactly defined in the operating frequency band to improve the driving efficiency between a sonar transmitter and a transducer. This paper used the PSO (particle swarm optimization) algorithm to estimate electrical equivalent circuit parameters of a transducer that has mul...
Published in Geomechanics and Geophysics for Geo-Energy and Geo-Resources
AbstractMicrowave-assisted rock fracturing has been widely applied to satisfy increasing demands for safety, high efficiency and energy saving. During microwave irradiation, rock damage occurs as a result of the irregular distribution of induced temperatures and resulting thermal stresses. This non-uniform temperature distribution may develop from ...
Here, we propose an optimized Y -rotated cut of lithium niobate (LN) for multidirectional surface acoustic wave (SAW) propagation, simultaneously minimizing the anisotropic effects while maximizing the electromechanical properties of this cut of LN. The goal is to offer a piezoelectric material suitable for acoustofluidics applications that require...
Published in Applied Physics A
A Nd:YAG laser with 7-ns pulses and pulse energies up to 10 mJ is used to induce an optical breakdown in the front surface of an aluminum rod, covered by a water layer. The rod is part of a ballistic pendulum. In this way, we study the propulsion effects by means of coupling coefficient and energy-conversion efficiency with respect to different con...
Published in Environmental Science and Pollution Research
To reveal the historic characteristics of the material flow, energy flow and value flow in a lead-acid battery (LAB) system, a framework for the coupling relationship among the three flows was established based on material flow analysis and the characteristics of the energy and value flows. The coupling coefficients between energy and material (CCE...
Published in MATEC Web of Conferences
The basic theory of coupler is introduced, and a tunable strip-line wideband coupler is designed by using radio-frequency/microwave software which is named ADS on the basis of theoretical calculations and analysis. The broadband coupler can be adjusted appropriately in different frequency regions by using a tunable band line. It has a wide bandwidt...
Published in Optical and Quantum Electronics
We obtain the calculation of coupling coefficient of plasmonic directional coupler made up of two monolayer waveguides separated in the range of 200 nm for TM mode and we assume each waveguides acts as a perturbation to other waveguide but does not affect the waveguide mode. We simulation the transfer distance respect to normalized frequency in two...
Published in International Journal of Information Technology
In this work we proposed fibre Bragg grating (FBG) based pressure sensor, to detect the pressure in subaquatic application. For specific underwater pressure intervals, change in wavelength of FBG sensor is simulated with photonic design software. Obtained results exhibited distinct shift in peak resonant wavelength with wavelength ranging from 1550...
Published in Arabian Journal for Science and Engineering
In case of misalignment, variation in the coupling coefficient between transmitting and receiving coils employed for wireless power transfer is obvious. During the design process of coil system, assurance of least affected coupling coefficient during misalignment is an important issue and can be addressed through appropriate coil structure. Asymmet...
Published in Nuclear Science and Techniques
We demonstrated a novel method to measure the unloaded quality factor (Q factor) of high-Q resonant cavities. This method was used to obtain data with low errors and calculate the unloaded Q factor. This procedure was more reliable than traditional methods. The data required for the method were near the resonant frequency, not at the half-power poi...
