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The results of statistical and morphological studies of ionospheric scintillation data at S band (2492.08 MHz), still unexplored, in conjunction with those at L5 (1176.45MHz) and VHF (250.650 MHz) band for the period of 2015–2016 are presented. The observations are carried out at Raja Peary Mohan College center (RPMC: 22.660 N, 88.40 E) situated near the northern crest of the equatorial ionization...
Flood maps are indispensable to regional prioritization and effective resource distribution, and are required by policy makers, insurance firms, and disaster-relief agencies. SAR (Synthetic Aperture Radar) image classification is widely used for flood mapping, although the utilization of image texture has not been well explored. This study proposes a novel SAR-based flood mapping technique that uses...
This paper presents a novel approach for the optimal design of a Low Noise Amplifier (LNA) with inductive source degeneration circuit using a novel hybrid optimization technique called fitness based adaptive differential evolution with particle swarm optimization (ADEPSO). The simulation results obtained for the designed LNA confirm the effectiveness of the ADEPSO based approach over PSO in terms...
This paper presents a new idea to solve the selective harmonic elimination (SHE) equations with non equal dc sources using Hybrid Newton Raphson Method (HNRM). This technique is a combination of genetic algorithm (GA) and Newton Raphson Method (NRM). The HNRM technique effectively eliminates the lower order harmonics from the output voltage of the converter. In this paper, it has been also shown that,...
Solar energy with solar tracking, will become possible to generate more energy since the solar panel depends on the sun. Even though the initial cost of setting up the tracking system is considerably high, there are cheaper options that have been proposed over time. Light Dependent Resistors (LDRs) are used for sunlight detection. The control circuit is ATMega 328P microcontroller. The solar panel...
A multilevel Power converter structure is based on the concept of High power and medium voltage situations. Its concept is to use a series of power and medium voltage situations. Its concept is to use a series of power semiconductor switches with several layer voltage dc sources to perform the power conversion by synthesizing a staircase voltage waveform. Multilevel converter operates both in inverter...
In this paper, a comparative study of different harmonic elimination techniques has been adopted to mitigate the undesired dominant lower order harmonics from the output voltage of cascaded multilevel inverter. It has been shown that particle swarm optimization technique gives better result as compared to the mathematical theory of resultant and newton raphson method. Theoretical results are verified...
In this paper, we aim to present a surface potential based model for GaN High Electron Mobility Transistors. The analytical model is computationally efficient and can be accurately used for DC and RF predictions. It includes various effects of velocity saturation, access region resistance, temperature, gate current and noise.
Important aspect of antenna array optimization is to validate the obtained results in a practical environment. This paper presents the practical validation of time modulated linear antenna arrays (TMLAA) with optimized radiation pattern using EM simulator. The optimization is done by using particle swarm optimization with improved inertia weight (PSOIIW) algorithm approach. Computer simulation technology-microwave...
This paper presents a new optimization technique known as Hybrid Newton Raphson method to solve non linear transcendental equations that has multiple solutions. This technique is a combination of genetic algorithm and newton raphson method. This method effectively works and minimizes the dominant lower order of harmonics from the output voltage waveform of 11-level multilevel inverter and controls...
The important features of modular multilevel inverters(MMLIs) are lower power dissipations in the switches, low harmonic contents, modularity and outputs with lower electromagnetic interference (EMI). The MMLI discussed is based on the half-bridge topology. A comparative study of two level VSI and 3, 5 level MMLI is discussed in the context of their total harmonic distortion in simulink models.
This paper delivers an efficient and accurate approach for identification of a Box-Jenkins (BJ) structure based Wiener model with Simplex Particle Swarm Optimization (SPSO) algorithm. The accuracy and the precision of the identification scheme have been justified with the reported bias and variance information, respectively, of the estimated parameters. The output mean square error (MSE) has been...
Oral cancer is one of the most prevalent form of cancer and its severity is aggrandized specially among the socio-economically backward population in developing countries. A major fraction of patient population is unable to avail diagnosis for oral cancer due to scarcity of state-of-the-art infrastructure and experienced oral and maxillofacial pathologist. Contemporary gold standard of oral cancer...
A series of pulsed power driven recent Kr gas-puff experiments on the Sandia National Laboratories Z machine have produced intense X-rays in the multi-keV photon energy range. Krypton spectra from Z pinch implosions can be used to analyze the presence and dynamics of the emitting regions, which could dominate the Kr K- and L-shell yields. This theoretical investigation of highly charged high atomic...
Substantial progress has been made in developing plasma radiation sources from Z-pinch implosions. University pulsed power machines provide a cost effective platform to study alternative mechanisms of producing x-rays in exploratory experiments that may provide guidance in search of further improvements on the larger machines. Radiation from puff-on-wire implosions were studied by Chuvatin et al....
BiAgX is one of the potential lead-free substitutes for lead-rich solders for high temperature interconnections, with a melting temperature above 533K after reflow. This study focuses on the mechanical properties of a particular BiAgX solder alloy. These properties are compared to a selected lead-rich solder for reference. The paste for this solder is in the form of mixed solder powder alloys and...
Bias Temperature Instability (BTI) is a tremendous reliability concern for deeply scaled CMOS technologies, and is the limiting mechanism for further inversion layer thickness (Tinv) scaling for future nodes [1]. Replacement Metal Gate technologies are of particular concern, since the gate stack is not exposed to the high temperature source/drain anneals. We have identified four strategies for reducing...
The focus of this paper is on a modeling methodology for capturing the complex mechanical behavior of a single layer pressure-sensitive adhesive (PSA) system, based on empirical observations of its stress-strain behavior. This study is motivated by the fact that there is very limited modeling ability to mechanistically predict the bimodal stress-strain curves of single-layer PSAs. Empirical observations...
Nanoindentation has been popular since the 1970s for querying material behavior at extremely small length scales. This paper focuses on using a combination of indentation and FEA methods for characterizing the viscoplastic behavior of composite materials and sintered materials, which pose additional challenges because of the heterogeneous morphology. In particular, this paper focuses on two forms...
Summary In recent years, there have been significant advances in instrumental capabilities for making X-ray spectroscopic measurements of astrophysical plasmas. There have been corresponding improvements in X-ray diagnostics for advanced multi-mega-ampere pulse power machines which produce increasingly large radiative yields from gas-puff and wire array Z pinch plasmas. Analysis used for Z pinches...
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