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Banerjee S.,Rk Mission Residential College | Ghosh S.K.,Bengal Engg And Science University | Datta S.,Dehradun Institute of Technology | Saha S.K.,Jadavpur University
Measurement: Journal of the International Measurement Confederation | Year: 2013

Digital image processing is used to analyze the microscopic images of the materials. Extraction of grains/phases present in the material is the fundamental step to achieve the description of the microstructure. In this work, we present an automated scheme for segmenting the phases present in the scanning electron microscopic images of dual phase steel. The challenges posed by the presence of revealed grain boundaries bearing striking similarity with one of the phases and intensity variation within the phase regions also has been addressed successfully. The proposed scheme successfully approximates the closed phase regions for a variety of micrographs. Moreover, the proposed scheme does not make any assumption regarding the factors like magnification and any other imaging condition affecting the image characteristics. © 2013 Elsevier Ltd. All rights reserved. Source


Manna B.,Jadavpur University | Sarkhel S.,Jadavpur University | Islam N.,Rk Mission Residential College | Sarkar S.,Jadavpur University | Sarkar S.K.,Jadavpur University
IEEE Transactions on Electron Devices | Year: 2012

An overall performance comparison analysis based on 2-D Poisson's equation solution has been presented here both for silicon-on-insulator (SOI) and silicon-on-nothing (SON) MOSFET structures. In this paper, for the first time, an idea of work function engineering with continuous horizontal mole fraction variation in a binary alloy gate has been proposed and implemented analytically to reduce rolloff in threshold voltage for SON MOSFET, thereby improving its performance over single-gate SON structures. Analytical model-based simulation verified that SON is superior over SOI MOSFET due to its higher immunity to different short-channel effects and increased current driving capability. Our results are found to be in good agreement with simulation results, thereby verifying the accuracy of the proposed analytical model. © 2012 IEEE. Source


Deb S.,Jadavpur University | Singh N.B.,Manipur Institute of Technology | Islam N.,Rk Mission Residential College | Sarkar S.K.,Jadavpur University
IEEE Transactions on Nanotechnology | Year: 2012

Over the last few decades, silicon-on-insulator (SOI) technology has been identified as one possible solution for enhancing the performance of CMOS because of its numerous advantages over conventional bulk CMOS technology. One of the primary drawbacks of short-channel SOI MOSFET is the degradation of device threshold voltage with decreasing channel length. Drain-induced barrier-lowering (DIBL) effect, generated from high drain bias, is the main cause behind this length-dependent nature of threshold voltage. This "instability" in threshold voltage is responsible for making SOI device design very challenging. The instability that is known as the threshold voltage rolloff restricts further scaling of SOI devices. In this paper, an idea of work function engineering with continuous horizontal mole fraction variation in a binary alloy gate has been proposed and implemented theoretically. Analytical model-based simulation verified that performance of proposed SOI MOSFET is improved as it has higher immunity to DIBL effect. © 2002-2012 IEEE. Source


Roy A.S.,Rk Mission Residential College | Biswas M.K.,Rk Mission Residential College | Weyhermuller T.,Max Planck Institute for Chemistry | Ghosh P.,Rk Mission Residential College
Inorganica Chimica Acta | Year: 2010

Stereoselective coordination affording a luminescent tcc-isomer of dihalobis(diimine)Co(II) family in which two photoactive diimine ligands (L NO2 φ) are unsymmetrical and non-equivalent is reported (LNO2 φ = (E)-3-nitro-N-(pyridine-2-ylmethylene) aniline; φ = dihedral angle between the diimine unit including pyridine ring and the phenyl ring planes; tcc refers trans-cis-cis positions with respect to pyridine nitrogen-imine nitrogen-chloride donors). The single step reaction of 2-pyridinecarboxaldehyde, 3-nitro aniline and anhydrous cobalt dichloride affords only the tcc-(LNO2 φ1)(LNO2 φ2)CoIICl2 as the product which is characterized by IR, Mass, UV-Vis spectra and magnetic susceptibility measurements. Single crystal X-ray structure determination has established the orientation of the two ligands in the crystal as (LNO2 33.7)(LNO2 79.7)CoIICl 2·0.25CH3OH (1). The isomer is luminescent in frozen methanol glass at 77 K with the excitation and emission maxima respectively at 370 and 525 nm. The average luminescence life time is 1.86 ns measured on exciting at 356 nm. Density functional theory (DFT) calculation shows that the non-equivalence of the two diimine ligands prevails in the gas phase also and the geometry is (LNO2 41.0)(L NO2 60.5)CoIICl2. The calculation has identified four types of closely spaced localized π orbitals as unoccupied photoactive molecular orbitals (UPMOs). TD-DFT calculations have assigned the Co(II) to π charge transfer (MLCT) and π to π of charge transfer (LLCT) as the primary origin of absorption above 340 nm in methanol. Pendant nitro groups of the ligands and their intermolecular interactions have been the driving force of the stereoselectivity of the product. The binuclear L 4Co2Cl4 unit of 1 has constructed the helical 2D assembly and cis-CoCl2 mediated strong inter-helices H-bonding interactions result the channeled 3D framework. Geometry optimization of other possible ttt, ctc, ccc and cct isomers has established that in the gas phase, the tcc-isomer is more stable at least by 20-42 kJ mol-1 compared to other isomers where the two diimine ligands are equivalent. © 2010 Elsevier B.V. All rights reserved. Source

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