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[IEEE 2019 IEEE International Conference on Design & Test of Integrated Micro & Nano-Systems (DTS) - Gammarth-Tunis, Tunisia (2019.4.28-2019.5.1)] 2019 IEEE International Conference on Design & Test of Integrated Micro & Nano-Systems (DTS) - Fast and Accurate Simulation of Ultrascaled Carbon Nanotube Field-Effect Transistor Using ANN Sub-Modeling Technique
摘要： In this paper, we have proposed a new modeling methodology based on the artificial neural networks (ANN) to simulate the ultra-scaled carbon nanotube field-effect transistor (CNTFET). The sub-modeling concept has been employed to efficiently simplify the overall modeling process. The developed sub-models have been compared with the mode space non- equilibrium Green’s function ( MS-NEGF) simulations in terms of the resulted drain current, where a good agreement has been recorded. In addition, simulation tests have shown that the proposed smart models are faster of about two order of magnitude over the standard MS-NEGF simulation. The obtained results indicate that the proposed ANN-based sub- modeling is an accurate and computationally efficient approach, which can be successfully used to simulate, analyze, and optimize the ultra-scaled CNTFETs and the futuristic CNT-based nanoscale integrated circuits.
关键词： computational intelligence,Artificial neural networks (ANN),non-equilibrium Green’s function (NEGF),numerical modeling,carbon nanotube (CNTFET)
更新于2025-09-12 10:27:22
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Engineering the Charge Transport Properties of Resonant Silicon Nanoparticles in Perovskite Solar Cells
摘要： Resonant semiconductor nanoparticles (NPs) that improve both light trapping and scattering have recently emerged as an additional tool for enhancing the efficiency of perovskite solar cells. Among the various types of nanostructures, silicon NPs, which support Mie modes and have lower losses compared with metallic particles with plasmon resonances, exhibit the best improvement for standard methyl-ammonium lead iodide (MAPbI3)-based solar cells. Herein, not only the optical problem of solar cell optimization with silicon nanoantennas is studied, but also the effects related to charge carrier transport in the presence of NPs are considered. In particular, it is theoretically shown that the silicon nanoantennas can be further optimized by p-doping. The experimental verification is conducted for MAPbI3-based solar cells by p-doped silicon NPs in a hole transport layer (Spiro-OMeTAD). The improved generation rate of charge carriers and hole transport through the doped silicon NPs leads to improved efficiency of the device.
关键词： numerical modeling,perovskite solar cells,Mie resonances,silicon nanoparticles
更新于2025-09-11 14:15:04
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Resonant Piezoelectroluminescent Fiber-Optical Sensor of a Temperature Field in Composite Structures
摘要： A dynamic mathematical model of functionation of a fiber-optical sensor in the process of resonant diagnosing of a temperature field inhomogeneous along the longitudinal axis of the sensor is developed. The resonant approach is based on a given amplitude-frequency characteristic of forced stationary electroelastic vibrations of a local section of the sensor caused by the action of the harmonic component of controlling voltage (CCV) on its electrodes; the constant CCV is necessary for tuning the sensor to the operating mode in the range of temperatures considered. The density distribution function of temperature along the sensor is found by solving the Fredholm integral equation of the first kind using the measured values of derivative with respect to the frequency of the harmonic CCV of the function of the amplitude of intensity of glow at the exit of the fiber-optical sensor. A method for resonant scanning of an ina uniform temperature field along the longitudinal axis of the sensor is developed; the method uses a new algorithm for processing the intensity of informative light signals at the exit from the optical fiber for various frequencies of the harmonic CCV. Results of a numerical modeling of the function of intensity of light pulses at the exit from the fiber-optical sensor, of the distribution of voltage amplitudes on the electroluminescent layer and of resonance frequencies along the sensor axis are presented for diagnosing an inhomogeneous model temperature field.
关键词： light intensity,mechanoluminescence effect,piezoresonator,Fredholm integral equation,optical fiber,numerical modeling,piezoelectroelasticity,temperature sensor
更新于2025-09-11 14:15:04
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Dynamic Backscattering Halo of Pulsed Laser Beams in Thin Cloud Layers
摘要： We consider the e?ect of the dynamic backscattering halo of pencil beams of light in thin layers of scattering media. Numerical modeling, which immediately demonstrates this e?ect, is performed. A simple analytical theory that provides a numerical criterion for the e?ect visual detection, is proposed.
关键词： numerical modeling,pulsed laser beams,thin cloud layers,analytical theory,dynamic backscattering halo
更新于2025-09-11 14:15:04
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Fine-scale features on the sea surface in SAR satellite imagery – Part 2: Numerical modeling
摘要： With the advent of the new generation of synthetic aperture radar (SAR) satellites, it has become possible to resolve fine-scale features on the sea surface on the scale of meters. The proper identification of sea surface signatures in SAR imagery can be challenging, since some features may be due to atmospheric distortions (gravity waves, squall lines) or anthropogenic influences (slicks), and may not be related to dynamic processes in the upper ocean. In order to improve our understanding of the nature of fine-scale features on the sea surface and their signature in SAR, we have conducted high-resolution numerical simulations combining a three-dimensional non-hydrostatic computational fluid dynamics model with a radar imaging model. The surface velocity field from the hydrodynamic model is used as input to the radar imaging model. The combined approach reproduces the sea surface signatures in SAR of ship wakes, low-density plumes, and internal waves in a stratified environment. The numerical results are consistent with observations reported in a companion paper on in situ measurements during SAR satellite overpasses. Ocean surface and internal waves are also known to produce a measurable signal in the ocean magnetic field. This paper explores the use of computational fluid dynamics to investigate the magnetic signatures of oceanic processes. This potentially provides a link between SAR signatures of transient ocean dynamics and magnetic field fluctuations in the ocean. We suggest that combining SAR imagery with data from ocean magnetometers may be useful as an additional maritime sensing method. The new approach presented in this work can be extended to other dynamic processes in the upper ocean, including fronts and eddies, and can be a valuable tool for the interpretation of SAR images of the ocean surface.
关键词： SAR,radar imaging,sea surface,magnetic signatures,numerical modeling,computational fluid dynamics
更新于2025-09-10 09:29:36
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A review on modeling and simulation of solar energy storage systems based on phase change materials
摘要： Phase Change Materials (PCM) have been widely used in different applications. PCM is recognized as one of the most promising materials to store solar thermal energy in the form of latent heat. Utilization of PCMs for solar energy storage compensates for the intermittent characteristic of this energy source. Mathematical modeling and numerical simulation of solar energy storage systems provide useful information for researchers to design and perform experiments with a considerable saving in time and investment. This paper is focused on modeling and simulation of PCM based systems that are used in different solar energy storage applications. A thorough literature review is performed to investigate and compare the results and accuracy of different mathematical models, numerical methods and thermodynamic analysis of using different PCMs in different solar systems. Moreover, the potential research areas in numerical simulations and thermodynamic analysis of solar systems based on PCMs are determined considering the existing gaps in the literature.
关键词： Phase change materials,Solar energy storage systems,Numerical modeling,Simulation
更新于2025-09-10 09:29:36