Mepco Schlenk Engineering College

About: Mepco Schlenk Engineering College is a based out in . It is known for research contribution in the topics: Wavelet & Wavelet transform. The organization has 1307 authors who have published 1665 publications receiving 18690 citations.

Performance analysis of speed control of PMSM drive with sinusoidal PWM and space vector pwm fed voltage source inverters

Abstract: This paper presents the simulation analysis of voltage source inverters using space vector pulse width modulation (SVPWM) for controlling the speed of Permanent Magnet Synchronous Motor (PMSM). It is well known that field Oriented Control (FOC) of PMSM drive is widely preferred in high performance drive systems, owing to its unique characteristics like high efficiency, better power factor, low inertia, superior power density and high torque to volume ratio. This SVPWM scheme adjusts the speed of the motor by controlling the frequency and amplitude of the stator voltage. Moreover, this SVPWM method is an advanced intense computational modulation method with several advantages such as less harmonic content, effective utilization of DC bus and complete implementation by a single chip microprocessor, relative to other PWM modulations. Due to these much advantages, SVPWM has found increasing applications in power converters and motor control. This paper focuses on modeling, design and analysis of SVPWM fed 3-Phase Voltage Source Inverter (VSI) model, for speed control of PMSM drive using MATLAB/SIMULINK.

In silico screening and molecular dynamics of phytochemicals from Indian cuisine against SARS-CoV-2 MPro

Abstract: SARS-CoV-2 cause fatal infection in 213 countries accounting for the death of millions of people globally. In the present study, phytochemicals from spices were assessed for their ability to interact with SARS-CoV-2 MPro. Structure based virtual screening was performed with 146 phytochemicals from spices using Autodock Vina. Phytochemicals with binding energy ≥ -8.0 kcal/mol were selected to understand their interaction with MPro. Virtual screening was further validated by performing molecular docking to generate favorable docked poses and the participation of important amino acid residues. Molecular dynamics simulation for the docked poses was performed to study thermodynamic properties of the protein, ligand and protein-ligand complexes. The finding shows that cinnamtannin B2 and cyanin showed favorable binding affinity values with SARS-CoV-2 MPro. The results are comparable in terms of docked poses, important amino acid participation and thermodynamic properties with the standard control drugs remdesivir, benazepril and hydroxychloroquine diphosphate. Prime MM-GBSA was employed for end-point binding energy calculation. Binding to domain I and II of MPro were mediated through the OH, SH, NH2 and non-polar side chain of amino acids. Cinnamtannin B2 and cyanin binds to MPro with many sub sites within the active site with RMSD and RMSF within 4 A. The results computed using Prime MM-GBSA show that cinnamtannin B2 (-68.54940214 kcal/mol) and cyanin (-62.1902835 kcal/mol) have better binding affinity in comparison to hydroxychloroquine diphosphate (-54.00912412 kcal/mol) and benazepril (-53.70242369 kcal/mol). The results provide a basis for exploiting cinnamtannin B2 and cyanin as a starting point potential candidate for the development of drug against SARS-CoV-2. Communicated by Ramaswamy H. Sarma.

Comparison on Bactericidal and Cytotoxic Effect of Silver Nanoparticles Synthesized by Different Methods

Abstract: Biologically synthesized silver nanoparticle are biocompatible for medical applications. The present work is aimed to synthesize silver nanoparticle using the fruit pulp of Tamarindusindica and to evaluate its antibacterial and anticancer activity against lung cancercell lines. Antibacterial activity was assessed by well diffusion method. Cytotoxicity was evaluated using MTT assay. GC-MS of fruit pulp extract showed the presence of levoglucosenone, n-hexadecanoic acid, 9,12-octadecadienoic acid etc. Antioxidant activity of the fruit pulp was determined by DPPH assay, hydrogen peroxide scavenging assay and lipid peroxidation. The size of biologically synthesized silver nanoparticle varied from 50 nm to 76 nm. It was 59 nm to 98 nm for chemically synthesized silver nanoparticle. Biologically synthesized silver nanoparticle showed 26 mm inhibition zone against E. coli and chemically synthesized silver nanoparticle showed 20 mm. Antioxidant activity of fruit extract by DPPH showed 84 % reduction. The IC 50 of biologically synthesized silver nanoparticle against lung cancer cell lines was 48 µg/ml. It was 95 µg/ml for chemically synthesized silver nanoparticle. The increased activity of biologically synthesized silver nanoparticle was due to its smaller size, stability and the bioactive compounds capping the silver nanoparticle extracted from the fruit extract.

Combined global and local semantic feature–based image retrieval analysis with interactive feedback:

Abstract: Nowadays, user expects image retrieval systems using a large database as an active research area for the investigators. Generally, content-based image retrieval system retrieves the images based on...

Fabrication of bistable switching device using CdS nanorods embedded in PMMA (polymethylmethacrylate) nanocomposite

Abstract: An organic bistable memory device was fabricated using CdS NR’s/PMMA (polymethylmethacrylate) nanocomposite sandwiched between ITO and Al thin film. XRD analysis confirmed that CdS NR’s reveals wurtzite hexagonal phase. FESEM and TEM images showed the monodispersed rod-like morphology. The nanorods were uniformly dispersed in the PMMA (polymethylmethacrylate) layer. EDX spectrum confirms that the product consists of only Cd and S elements. No other impurities were found. UV–visible absorption of CdS NR’s showed a slight blue shift. The photoluminescence spectra of CdS NR’s spectra showed surface defects which may be due to sulfur vacancies in surface of nanorods. The CdS NR’s polymer nanocomposite showed better thermal stability. The current–voltage (C–V) measurement of ITO/CdS NR’s/Al showed a clockwise hysteresis with flatband shift voltage in C–V curve for the device.