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- 2015
- Xanthomonas oryzae
- multispectral and multimodal microscopy
- spectroscopic imaging
- plant cell diseases
- classification
- rice
- Applied Physics
- University of Sciences, Technique and Technology Bamako
- Institut National Polytechnique Felix Houphou?t-Boigny Yamoussoukro
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[IEEE 2018 IEEE PES/IAS PowerAfrica - Cape Town, South Africa (2018.6.28-2018.6.29)] 2018 IEEE PES/IAS PowerAfrica - Efficient Energy Management System Using Pir Sensor
摘要： In most developing countries like Nigeria, the demand for electrical energy outweighs the supply. Negative economic and environmental impacts are also associated with its generation, transmission, and consumption. As a result there is need for the available energy to be efficiently managed. This project designed and implemented a microcontroller based energy saver and management system. The design of the energy saver and management system was aimed at coordinating the manner of use of electrical appliances, thereby reducing energy consumption in electrical appliances (such as fan and light) and devising a means of reducing the need for human intervention in the control of electrical appliances in a residential building. The project consists of a PIC microcontroller that utilizes a PIR sensor to detect occupants’ presence in the building; it also has a light intensity detection unit used to determine the level of ambient lighting as well as a temperature sensor to determine ambient temperature. The control signal from the microcontroller was used to operate the load driver circuit to switch the appliances on or off. The results show that the designed system can reduce the level of energy consumption effectively and efficiently.
关键词： load driver circuit,appliances,temperature sensor,light intensity detection,PIC microcontroller,Energy saver and Management system
更新于2025-09-23 15:21:21
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Particle-in-cell simulation for experimental ion acceleration by fs laser-generated plasma
摘要： Particle in cell simulation was applied to fit the measurements of protons and ions acceleration obtained using an fs laser pulse irradiating a thin foil in target-normal-sheath-acceleration regime. The simulation code calculates the maximum electrical field generated in the rear side of the target driving the forward ions acceleration. The electron density versus time and space, and the plasma temperatures are evaluated using a medium contrast laser at an intensity of about 1019 Wcm?2. Proton acceleration above 10 MeV was experimentally measured using SiC detectors connected in time-of-flight configuration. A comparison between theoretical aspects and experimental data is reported and discussed.
关键词： ion acceleration,SiC,PIC,TNSA,fs laser
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE BiCMOS and Compound semiconductor Integrated Circuits and Technology Symposium (BCICTS) - Nashville, TN, USA (2019.11.3-2019.11.6)] 2019 IEEE BiCMOS and Compound semiconductor Integrated Circuits and Technology Symposium (BCICTS) - Coherent Transceiver for High Speed Optical Communications: Opportunities and Challenges
摘要： Conformal (or body-?tted) electromagnetic particle-in-cell (EM-PIC) numerical solution schemes are reviewed. Included is a chronological history of relevant particle physics algorithms often employed in these conformal simulations. Brief mathematical descriptions of particle-tracking algorithms and current weighting schemes are provided, along with a brief summary of major time-dependent electromagnetic solution methods. Several research areas are also highlighted for recommended future development of new conformal EM-PIC methods.
关键词： Computational electromagnetics,conformal mesh,reviews,plasma simulation,particle in cell (PIC)
更新于2025-09-16 10:30:52
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Bi-Junction Carrier Depletion Type Electro-Optic Phase-Shifters
摘要： Silicon photonic integrated circuits (PICs) combine dense optical system integration with industrial scalability by adopting well-established CMOS fabrication processes. An electro-optic phaseshifter (EOP) represents a basic building unit of several PICs applications, including datacom optical switches, PIC-FPGAs, and beam steering. In-situ resistive-heaters in close vicinity of waveguides, or free-carrier injection/depletion in doped junctions, are common methods to build EOPs. Literature reports thermal shifters consuming 24.7 mW to achieve DC large signal π-phaseshift, power consumption of injection PIN implementations and depletion PN modulators of 10 mW and ≈ 0 mW respectively. A thermal EOP naturally avoids carrier-induced optical insertion losses (IL), in contrast to a PIN/PN modulator. Thus, thermal and PIN/PN methods trade-off IL with electrical power rather than minimizing both. An EOP of low optical losses and low electrical power is highly desired in large-signal, and low-speed applications.
关键词： electro-optic phaseshifter,datacom optical switches,PIC-FPGAs,beam steering,CMOS fabrication,Silicon photonic integrated circuits
更新于2025-09-11 14:15:04
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Design and Simulation of Compact Band-Pass Filter Using Stub Loaded Plasmonic Mim Waveguide
摘要： In this article, plasmonic band-pass filters (BPF) have been studied and numerically analyzed. This filter has been designed based on the two-stubs. Pass-band can be realized by appropriately adjusting the lengths and width of the resonator. Based on the ideal characteristics of the proposed two stubs BPF is allowing the band at THz frequencies. Multiple transmission zeros are generated to improve the selectivity of the filter. All simulated results have been studied using CST Microwave studio suite. Usually, the transmission effectiveness is revealed by the exact resonance condition, whichwill confirmalong with the numerical simulation or theoretical analysis. This article delivers a promising application for plasmonic BPFsin addition to plasmonic integrated circuits (PICs).
关键词： MIMSIR,BPF,PLASMONICS,SPP,PIC
更新于2025-09-11 14:15:04
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Generation of high-charge electron beam in a subcritical-density plasma through laser pulse self-trapping
摘要： To maximize the charge of a high-energy electron beam accelerated by an ultra-intense laser pulse propagating in a subcritical plasma, the pulse length should be longer than both the plasma wavelength and the laser pulse width, which is quite different from the standard bubble regime. In addition, the laser–plasma parameters should be chosen to produce the self-trapping regime of relativistic channeling, where the diffraction divergence is balanced by the relativistic nonlinearity such that the laser beam radius is unchanged during pulse propagation in a plasma over many Rayleigh lengths. The condition for such a self-trapping regime is the same as what was empirically found in several previous simulation studies in the form of the pulse width matching condition. Here, we prove these findings for a subcritical plasma, where the total charge of high-energy electrons reaches the multi-nC level, by optimization in a 3D PIC simulation study and compare the results with an analytic theory of relativistic self-focusing. A very efficient explicitly demonstrated generation of high-charge electron beams opens a way to a high-yield production of gammas, positrons, and photonuclear particles.
关键词： relativistic channeling,high-charge electron beam,subcritical-density plasma,laser pulse self-trapping,3D PIC simulation
更新于2025-09-11 14:15:04
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Metamaterials and Metasurfaces || Electron Beam-Induced Directional Terahertz Radiation from Metamaterials
摘要： We have numerically analyzed an electron beam (e-beam)-induced directional terahertz (THz) radiation from metamaterials. Here, we used metallic grating structures with graded depths, in which only one-way surface mode can be supported based on the spoof surface plasmon polariton (spoof SPP) concept and gives unique directional THz radiation. For numerical analysis, we used a simplified particle-in-cell (PIC) finite-difference time-domain (FDTD) method. First, we describe our simplified PIC-FDTD method in detail. Then, we show our results on the e-beam-induced directional THz radiation from graded grating with graded depths. By passing pulsed (bunched) e-beam along the grating surface, directional THz radiations are obtained from one side of the grating with shallower grooves. The direction of these radiations can be switched backward or forward by making the groove depth deeper or shallower. The spectra of these directional radiations are wide band and contain multiple sharp peaks. The deepest and the shallowest groove depths determine the lowest and the highest frequency of the radiation band, respectively. These unique radiation characteristics cannot be explained by the conventional Smith-Purcell radiation and should be attributed to the spoof SPP that originates from different locations on the graded grating.
关键词： graded grating,Smith-Purcell radiation,THz,particle-in-cell finite-difference time-domain,metamaterial,PIC-FDTD,electron beam,terahertz
更新于2025-09-11 14:15:04
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Simulations of carbon ion acceleration by 10 PW laser pulses on ELI-NP
摘要： We present results of 2D particle-in-cell (PIC) simulations of carbon ion acceleration by 10 petawatt (PW) laser pulses, studying both circular polarized (CP) and linear polarized (LP) pulses. We carry out a thickness scanning of a solid carbon target to investigate the ideal thickness for carbon ion acceleration mechanisms using a 10 PW laser with an irradiance of 5 × 1022 W cm?2. The energy spectra of carbon ions and electrons and their temperature are studied. Additionally, for the carbon ions, their angular divergence is studied. It is shown that the ideal thickness for the carbon acceleration is 120 nm and the cutoff energy for carbon ions is 5 and 3 GeV for CP and LP pulses, respectively. The corresponding carbon ions temperature is ～1 and ～0.75 GeV. On the other hand, the energy cutoff for the electrons is ～500 MeV with LP and ～400 MeV with CP laser pulses. We report that the breakout afterburner mechanism is most likely causing the acceleration of carbon ions to such high energies for the optimal target thickness.
关键词： Laser–plasma interactions,particle acceleration,PIC simulations
更新于2025-09-11 14:15:04
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[IEEE 2019 3rd School on Dynamics of Complex Networks and their Application in Intellectual Robotics (DCNAIR) - Innopolis, Russia (2019.9.9-2019.9.11)] 2019 3rd School on Dynamics of Complex Networks and their Application in Intellectual Robotics (DCNAIR) - The control of the dynamics of intense electron beams coupled through a common field
摘要： This paper presents the results of a study of the nonlinear dynamics of a system with several electron beams. A review and analysis of the latest results obtained in this area. In this case, the main emphasis in this work is made on controlling the generation characteristics in such a highly nonlinear system. The main dynamic modes typical for this kind of systems are shown.
关键词： non-stationary processes of electron-wave interaction,PIC,optimization,electron-plasma devices,numerical simulation
更新于2025-09-11 14:15:04
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[IEEE 2018 20th International Symposium on High-Current Electronics (ISHCE) - Tomsk, Russia (2018.9.16-2018.9.22)] 2018 20th International Symposium on High-Current Electronics (ISHCE) - Generation of Terahertz Radiation by Electron Beam-Plasma Interaction
摘要： At present, the search for new methods of generation electromagnetic radiation in the terahertz frequency range (THz) has emerged as one of the most promising rapidly in science and engineering, developing areas of research including security and medical diagnostics. One of the modern solutions of the problem is the generation of electromagnetic (EM) waves due to the interaction of high-current relativistic electron beams with plasma. Since in this case the radiation frequency is comparable with the plasma frequency, it can be easily adjusted by simply changing the plasma density. The efficient terahertz electromagnetic emission was produced during the injection of relativistic electron beams into plasma in laboratory experiments at the GOL-3 facility INP SB RAS. In this paper the mechanisms of the high efficiency of energy transfer from the relativistic electron beam to the EM radiation in turbulent regime of collisionless plasma are investigated on the base of computer simulation. The kinetic approach for ion and electron plasma components, as well as for electron beam, was used in 2D numerical model with the real mass ratio of charged particles. A parallel electromagnetic particle-in-cell (PIC) code UMKA2D3V was applied to simulate beam-plasma system for parameters close to the parameters of laboratory experiments at GOL-3 facility. Regimes of injection of one electron beam into the plasma and the counter injection of electron beams were considered. Computational experiments were performed using modern computer systems with massively parallel architecture.
关键词： terahertz radiation,electron beam-plasma interaction,PIC-method,plasma physics
更新于2025-09-09 09:28:46