The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Omar Elizarraras - One of the best experts on this subject based on the ideXlab platform.
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Dual-Band Performance Evaluation of Time-Modulated Circular Geometry Array With Microstrip-Fed Slot Antennas
IEEE Access, 2019Co-Authors: Zenon Medina, Alberto Reyna, Marco A. Panduro, Omar ElizarrarasAbstract:This paper applies time modulation to deal with the design of dual-band antenna arrays in a Circular Geometry using a micro-strip-fed slot antenna as an element in the frequencies of 2.4 and 5.5 GHz. The motivation for this paper is to exploit the properties and advantages of time-modulated arrays in a dual-band scenario considering a Circular Geometry. This design considers the optimization of the time switched sequences of the antenna elements in the Circular Geometry for both operation frequencies. The design process to find the optimal switch- ON intervals of the Circular array is carried out by means of the method of differential evolution and particle swarm optimization. The main contribution to the field of this paper is the dual-band performance evaluation of Circular antenna arrays considering time modulation and measurements of the antenna element pattern. The performance evaluation and the results and discussion are achieved in terms of the radiation pattern with the measured antenna element, sidelobe level, sideband levels, switching times and efficiency.
Lihong V. Wang - One of the best experts on this subject based on the ideXlab platform.
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Fast and Robust Deconvolution-Based Image Reconstruction for Photoacoustic Tomography in Circular Geometry: Experimental Validation
IEEE photonics journal, 2010Co-Authors: Chi Zhang, Lihong V. WangAbstract:Photoacoustic tomography (PAT) is a fast-developing biomedical imaging technology suitable for in vivo imaging. PAT in spherical or Circular Geometry gives good image resolution yet is slow or expensive in signal acquisition and image formation. Reducing the number of detection angles can ameliorate such issues, usually at the expense of image quality. This paper introduces a deconvolution-based algorithm that models the imaging process as a linear and shift-invariant system. As demonstrated by the in vivo experiment, this algorithm not only runs much faster than the back-projection algorithm but also shows stronger robustness in that it provides better image quality when detection angles are sparse. Therefore, this algorithm promises to enable real-time PAT in Circular Geometry.
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Deconvolution-Based Image Reconstruction for Photoacoustic Tomography in Circular Geometry
Biomedical Optics and 3-D Imaging, 2010Co-Authors: Chi Zhang, Lihong V. WangAbstract:This paper introduces a deconvolution-based algorithm for photoacoustic tomography in Circular Geometry. As demonstrated by the in vivo experiment, this algorithm runs fast and provides good image quality when detection angles are sparse.
Zenon Medina - One of the best experts on this subject based on the ideXlab platform.
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Dual-Band Performance Evaluation of Time-Modulated Circular Geometry Array With Microstrip-Fed Slot Antennas
IEEE Access, 2019Co-Authors: Zenon Medina, Alberto Reyna, Marco A. Panduro, Omar ElizarrarasAbstract:This paper applies time modulation to deal with the design of dual-band antenna arrays in a Circular Geometry using a micro-strip-fed slot antenna as an element in the frequencies of 2.4 and 5.5 GHz. The motivation for this paper is to exploit the properties and advantages of time-modulated arrays in a dual-band scenario considering a Circular Geometry. This design considers the optimization of the time switched sequences of the antenna elements in the Circular Geometry for both operation frequencies. The design process to find the optimal switch- ON intervals of the Circular array is carried out by means of the method of differential evolution and particle swarm optimization. The main contribution to the field of this paper is the dual-band performance evaluation of Circular antenna arrays considering time modulation and measurements of the antenna element pattern. The performance evaluation and the results and discussion are achieved in terms of the radiation pattern with the measured antenna element, sidelobe level, sideband levels, switching times and efficiency.
M. Pons - One of the best experts on this subject based on the ideXlab platform.
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Self-organization of charged particles in Circular Geometry.
Physical Review E, 2017Co-Authors: R. G. Nazmitdinov, Antonio Puente, M. Cerkaski, M. PonsAbstract:The basic principles of self-organization of one-component charged particles, confined in disk and Circular parabolic potentials, are proposed. A system of equations is derived, which allows us to determine equilibrium configurations for an arbitrary, but finite, number of charged particles that are distributed over several rings. Our approach reduces significantly the computational effort in minimizing the energy of equilibrium configurations and demonstrates a remarkable agreement with the values provided by molecular dynamics calculations. With the increase of particle number n>180 we find a steady formation of a centered hexagonal lattice that smoothly transforms to valence Circular rings in the ground-state configurations for both potentials.
Salvatore Lombardo - One of the best experts on this subject based on the ideXlab platform.
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Capacitance study of thin film SnO2 :F/p-type a-Si:H heterojunctions
Energy Procedia, 2011Co-Authors: G. Cannella, Fabio Principato, M. Foti, C. Garozzo, Salvatore LombardoAbstract:Abstract We characterized SnO 2 :F/p-type a-Si:H heterojunctions by current-voltage (I-V) and capacitance-voltage (C-V) measurements at room temperature to determine the junction parameters. Samples with Circular Geometry and different diameters were characterized. The current scales with the junction area, and the current density J as a function of the voltage V is a slightly asymmetric curve with a super-linear behaviour (cubic law) for high voltages. Using a transmission line model valid for devices with Circular Geometry, we studied the effects of the SnO 2 :F resistivity on the measured capacitance when the SnO2:F layer works as an electrical contact. The measured C-V curve allows us to determine junction parameters as doping of p-type a-Si:H, built-in potential and depletion width for the heterojunction with the smallest diameters, demonstrating that for these samples the TCO effects can be neglected. We compared theoretical and measured data to explain qualitatively the transport mechanism in this heterojunction.