There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

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Electronic Transport In Mesoscopic Systems

Time-Frequency Analysis.

Antenna Theory And Design

The nephrotic syndrome

In this work, a p-i-n junction type intermediate band solar cell (IBSC) model based on metal halide perovskite nanocrystals, specifically methylammonium lead iodide (MAPbI3) quantum dot (QD) and methylammonium lead bromide (MAPbBr3) barrier is designed analytically for the revolutionary next-generation photovoltaic applications. TiO2 and Spiro-OMeTAD are considered as transport layer for electron and hole, respectively. The impact of QD size and dot spacing on the key parameters of MAPbI3 QD-IBSC is illustrated by showing the wave nature of charge carriers within the QDs and their barrier. In order to identify the number of miniband in a single regime, Schrodinger equation is solved as a function of host energy gap using Kronig–Penney model. From the characteristics of electronic wave functions, it is evident that varying the QD size and interdot spacing lead to formation of more than one IB. For any case, (100)-oriented fcc crystal lattice structure is assumed. Major performance indicators of the device such as photocurrent intensity Jsc, open circuit voltage Voc, fill factor, absorbance spectra, photoluminescence (PL) intensity, external quantum efficiency (%EQE) and power conversion efficiency (PCE) η have been delineated. Highest PCE of 26.03% is attained for QD size of 5 nm and interdot spacing of 0.5 nm under one sun and AM 1.5 solar irradiation.

Key photovoltaic parameters of organohalide lead perovskite quantum dot intermediate band solar cell: A numerical investigation

The quasi-static capacitance-voltage (CV) characteristics of buried channel n-InGaSb MOSFET is investigated using SILVACO's ATLAS device simulation package. Self-consistent method is applied to solve the coupled one dimensional Schrodinger-Poisson equation taking into account of wave function penetration and strain effect. It is found that the CV profiles and threshold voltage are strongly depended on some important process parameters like oxide thickness, channel thickness, channel composition and temperature for buried channel InGaSb n-MOSFET.

Self-consistent quasi static CV characterization of In x Ga 1−x Sb buried channel n-MOSFET

Utilizing antenna diversity techniques has become a well-known approach to improve the performance of wireless communication systems. Multiple antenna arrays with half-length spacing, such as a uniform linear array (ULA), have been taken into consideration. Since 60 GHz is an unlicensed frequency band and ideal for local propagation, it is where the technology is being used. The transmitter and receiver both accomplish QAM modulation and demodulation. The performance in terms of bit error rate (BER) was tested in MATLAB simulation software for all antenna diversity scenarios: the single input and single output (SISO) DWT, multiple input and single output (MISO) DWT, single input and multiple output (SIMO) DWT, and multiple input and multiple output (MIMO) DWT. The MIMO DWT was shown to be the best of them. The performance of MIMO OFDM using various wavelets was also simulated, and the performance of the Haar wavelet transform was 2 dB better than that of the other wavelet transform. Compared to simulation results, the analytical results showed good agreement with little discrepancy.

https://www.mdpi.com/2079-9292/11/16/2626/pdf?version=1661163165

Performance Analysis Antenna Diversity Technique with Wavelet Transform Using Array Gain for Millimeter Wave Communication System

Antennas and propagation: modeling, simulation and measurements

Recent experiments proclaimed that organic-inorganic hybrid halide perovskites outperform due to its thermal stability, low cost, and high power conversion efficiency (PCE). To analyze the photoluminescence (PL) spectra, PL peak position, and full width at half maximum (FWHM)) of CH3NH3PbI3, CH3NH3PbBr3, and CH3NH3Pb(l1-xBrx)3 materials, we have adopted a numerical model with the Monte Carlo simulation (MCS) of exciton hopping and relaxation mechanism over a temperature regime 10K to 300K where bromine (Br) contents are taken as 0.2 to 0.8 with 0.2 intervals. From the result, the blue-shift continuously occurs until the phase transition from orthorhombic to tetragonal phase, and then a small red-shift occurs. After the small red-shift, a gradual blue-shift occurs up to the temperature reaches at 300K for every PL spectra. These shifts are performance-degrading parameters for temperature-dependent applications. With the proper investigation, the quantity of red-shift decreases in CH3NH3Pb(l1-xBrx)3 and occurs at a lower temperature with increasing bromine (Br) content respectively. This analysis suggests that mixed halide (bromine-iodine) perovskite at Br = 0.2 content is more stable than other combinations.

Md. Rafiqul Islam

Papers

Key photovoltaic parameters of organohalide lead perovskite quantum dot intermediate band solar cell: A numerical investigation

Self-consistent quasi static CV characterization of In x Ga 1−x Sb buried channel n-MOSFET

Performance Analysis Antenna Diversity Technique with Wavelet Transform Using Array Gain for Millimeter Wave Communication System

Antennas and propagation: modeling, simulation and measurements

Temperature Induced Anomalous Exciton Localization Dynamics of CH3NH3Pb(I1-xBrx)3 Perovskite Material: A Monte Carlo Simulation