Forthcoming articles

International Journal of Nanoparticles

International Journal of Nanoparticles (IJNP)

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International Journal of Nanoparticles (22 papers in press)

Regular Issues

  • Thermomagnetic convection in a layer of magnetic nanofluid saturating porous medium with magnetic field dependent viscosity   Order a copy of this article
    by Amit Mahajan, Mahesh Sharma 
    Abstract: In this paper, the effect of magnetic field dependent (MFD) viscosity on the onset of thermomagnetic convection is examined for a horizontal layer of magnetic nanofluid (or ferrofluid) saturated porous layer. A model that comprises the effect of Brownian diffusion, thermophoresis, magnetophoresis, and Darcy's law is considered. We employed the Chebyshev pseudospectral QZ-method to solve the developed mathematical model and the results are derived for water-based and ester-based magnetic nanofluids. The effects of significant parameters are analyzed at the onset of convection in the gravity as well as in the microgravity environment. The influence of MFD viscosity, permeability parameter, the width of the fluid layer, Lewis number, Langevin parameter, particle concentration, and the concentration Rayleigh number at the onset of thermomagnetic convection are graphically illustrated.
    Keywords: magnetic nanofluids; thermomagnetic convection; magnetic field dependent viscosity; microgravity; Darcy medium.

  • Synthesis of cadmium sulphide nanoparticles through liquid membrane pathway   Order a copy of this article
    by Sushma Chakraborty, Prabirkumar Saha 
    Abstract: This paper introduces a proof of concept that liquid membrane technology that has always been used as a separation technique, can also be extended for the generation of value added products in its downstream side. It is possible to generate cadmium sulphide nanoparticles in the stripping phase of liquid membrane separation unit which have wide industrial application such as solar and photovoltaic cells. The process parameters such as concentration of cadmium salt and pH in feed phase, concentration of strippant, concentration of extractant/carrier agent etc. were optimized leading to maximum production of CdS nanoparicles in the stripping phase. The characterization of CdS nanoparticles were carried out using TEM, FESEM-EDX, FT-IR, XRD and SAED. The nanosize and nanocrystalline nature of the CdS particles were established.
    Keywords: Bulk Liquid Membrane; CdS nanoparticles; 1,10 Phenanthroline; TEM; FESEM-EDX; FT-IR; XRD; SAED.

  • Optimization of Carbon Nanotubes for Advanced Diagnosis and Biomedical Application   Order a copy of this article
    by Khalid Parwez 
    Abstract: Nanomaterials have a broad spectrum of applications in bioengineering and pharmaceutical fields, and carbon nanotubes (CNT) are among the most versatile and well-characterized members of this group of materials. The aim of this review is to discuss how CNTs can be exploited as diagnostic tools in various diseases. Various ways to functionalize the CNTs have been broadly discussed among which functionalization with antibodies has gained significance in recent years. Antibodies make their surface sensitive to surroundings which can be utilized in immuno-sensing. Surface passivation with other proteins is required to inhibit the non-specific binding of biomolecules on the hydrophobic carbon nanotube surface for ultrasensitive detection of biological species. The various intrinsic optical properties of SWCNT can be applicable in NIR-imaging of both in-vitro and in-vivo biological systems. They also have unique resonance-enhanced Raman signatures for Raman detection/imaging. CNT-based immuno-sensors provide very good results with a promising sensitivity and reproducibility and, in combination with novel devices (such as microfluidic electrochemical biosensor, Nanoelectromechanical systems (NEMS), Paper-based analytical devices (PADs), Field effect transistors (FET)), offer an attractive analytical approach for the fast, low-cost, and accessible detection of trace prognostic biomarkers, microbial pathogens, environmental pollutants and toxins.
    Keywords: Nanomaterials; Carbon nanotubes; Functionalization; Biosensor; Immuno-sensor; FETs; MEMS; PADs; Tissue Engineering.

  • A Novel Approach for Computation of Cosine Function   Order a copy of this article
    by Abul Hasnat, Santanu Halder, Azizul Hoque, Debotosh Bhattacharjee 
    Abstract: Trigonometric function evaluation is required in almost all science and engineering applications. Objective of trigonometric function approximation in any digital systems are- faster computation in less number of clock cycles, optimizing hardware resource requirement for the circuit, accura-cy in more number of bits in the evaluated output etc. This study proposes a novel method for cosine function computation and its respective FPGA based architecture. In this method, a triangle is presumably located in the first quadrant of a circle with unit radius whose one vertex is the centre, other two vertices touches the perimeter of the circle. Using the area of the triangle, it is observed that the y coordinate of the third vertex of the triangle is the sine value. The error is difference between arch length and side length. Newtons interpolation method is used to formulate the error approximation function. Once the error is approximated, the value of the y co-ordinate is calculated. This method is implemented using VHDL, synthesized on Xilinx Spartan 3 xc3s200-5ft256 FPGA kit simulated on ModelSim 6.2c. The proposed architecture gives accuracy of the computed cosine value up to 14 bits or more in 96% cases in eleven clock cycles only. The proposed architecture operates as fast as 89.977 MHz.
    Keywords: Triangle; Unit Circle; FPGA; CORDIC; Sine; Cosine; Newoton’s Interpolation.

  • Microwave assisted green synthesis of ZnO and Ag doped ZnO nanoparticles as antifungal and antibacterial agents using Colocasia esculenta leaf extract   Order a copy of this article
    by Kiran Kumar Prem Kumar, Satish Kumar Murari, Nandipura D. Dinesh 
    Abstract: Considering the growing popularity of biosynthesis methods, the use of plant extracts for environment friendly synthesis of nanoparticles and the novel biomedical applications of zinc oxide (ZnO), the present study aims to synthesise ZnO and Ag doped ZnO nanoparticles through microwave assisted green synthesis method using the leaf extract of Colocasia esculenta. The nanoparticles synthesised were characterised for the assessment of their crystal structure, chemical phases, optical properties, distribution of particle size, stability, morphology, elemental composition, etc., by using a range of techniques, taking into account that the benefits of ZnO nanoparticles as piezoelectric conductors, transducers, antimicrobial agents, etc., predominantly depend on such morphological aspects. The efficiency of the synthesised nanoparticles as antimicrobial agents and comparison of the biocidal effects of doped and undoped nanoparticles were examined against the bacterial species, Bacillus subtilis and Escherichia coli, as well as the fungal species, Aspergillus oryzae and Saccharomyces cerevisiae, by using the cell culture technique.
    Keywords: ZnO nanoparticles; ZnO/Ag nanocomposites; nanotechnology; Colocasia esculenta; green synthesis; leaf extract; microwave method; characterisation; antifungal; antibacterial.

  • Silicon Based Core-shell Nanoparticles Nanobiomedical Characterization   Order a copy of this article
    by Ahmad Salmanogli, Farzin Asghari Sana 
    Abstract: Using functionalized nanoparticles in nanobiomedical applications cause to raise questions about unintentional effect of such powerful agents on the human body. In other words, the study of nanoparticle toxicity can be considered as a curtail key for the biological applications. In this study, the core/shell nanoparticles such as Si/Au and SiO2/Au were synthesized and functionalized with some biological elements. For satisfying some medical standards and biomedical critical test conditions, a few in-vitro assays as cytotoxicity and hemolysis should be done. For this reason, cytotoxicity and hemolytic effects of the functionalized nanoparticles such as Si/Au/Biotin and SiO2/Au/Biotin and their derivatives were evaluated on Hep-G2 cells and humane red blood samples. It is shown that cytotoxicity and hemolysis effects of the all synthesized nanoparticles are concentration-dependent. Also, the results are shown that most cytotoxicity and hemolytic effects are observed for Si/Au and SiO2/Au without Biotin groups after 48h and 30 minutes, respectively.
    Keywords: Silicon Core/shell nanoparticle; Nanocytotoxicity; MTT cytotoxicity assay; hemolysis.

  • Bactericidal effect of silver nanoparticles from aqueous root extracts of Catharanthus Roseus   Order a copy of this article
    by Subha V, ERNEST RAVINDRAN R S, ATHUL BALAJI HEMANT KUMAR, Renganathan S 
    Abstract: In this study, green synthesis of silver nanoparticle (AgNPs) is synthesized using aqueous root extract of Catharanthus roseus as a reducing as well as capping agent. The bioactive molecules present in the root extract such as alkaloids, flavonoids, carbohydrates, amino acids and phenolic compounds were found to be responsible for the reducing and capping of nanoparticles. Stable nanoparticles were observed after the addition of aqueous root extract into the silver nitrate solution. Biotransformation of the silver nitrate to silver nanoparticles were investigated by UV-visible Spectroscopy (UV) and found that the Surface Plasmon Resonance of the nanoparticles a shallow peak at 490 nm. XRD pattern shows the crystalline nature of silver nanoparticle. Highly mono dispersed silver nanoparticles within 100 nm rage was revealed from TEM. The activity of the silver nanoparticles against microbes were found to be higher the zone of inhibition in all the species used for the studies.
    Keywords: Silver Nanoparticles; Catharanthus roseus; Antimicrobial Activity.

  • EFFECT OF NICKEL DOPING ON THE STRUCTURAL, OPTICAL, ELECTROCHEMICAL AND MAGNETIC PROPERTIES OF HAUSMANNITE (Mn3O4) NANOPARTICLES   Order a copy of this article
    by S. KARPAGAVALLI, S. John Kennady Vethanathan, S. Perumal 
    Abstract: Nickel doped manganese tetroxide (Mn3O4) nanoparticles are synthesized by microwave assisted solvothermal route. The structural characterization of as prepared Ni doped Mn3O4 nanoparticles are determined by the aid of powder X-ray diffraction (XRD). The functional groups present in the material are determined by Fourier transform infrared (FTIR) analysis. The Transmission Electron Microscopy (TEM) images showed the topographical, compositional and crystalline information. Energy-dispersive X-ray (EDX) analysis determines the abundance of specific elements. The optical properties are analyzed by UltravioletVisible (UV-Vis) spectroscopy. The perceived red shift in the UV-Vis absorption spectra confirmed the stimulated electron-phonon interaction in Nickel doped Mn3O4 nanoparticles. The electrochemical characteristics of nickel doped Mn3O4 nanoparticles are examined by cyclic voltammogram (CV). The Vibrating Sample Magnetometer (VSM) studies confirmed the ferromagnetic behavior of Ni doped Mn3O4 nanoparticles at room temperature.
    Keywords: Solvothermal method; XRD; FTIR; UV-Vis; Electrochemical studies; VSM.

Special Issue on: 2018 IEEE EDKCON Recent Advances in Nano-Electronic Devices and Technology

  • Systematic Design Strategy for DPL-based Ternary Logic Circuit   Order a copy of this article
    by ALOKE SAHA, Narendra Deo Singh 
    Abstract: This work proposes novel strategy to design 2-input Ternary (Base-3) logic circuits using Double Pass-transistor Logic (DPL). The concept has been explored with respect to 2-input TXOR gate. The circuit diagram for TXOR, TAND and TOR logic gate based on proposed idea is presented. The proposed T-Cells are designed and optimized using BSIM3 device model with 1.8V supply rail and at 25
    Keywords: Double Pass-transistor Logic (DPL); Hot-spot; Ternary (Base-3) System; Wave-pipelining; 2:9 Ternary Decoder.

  • Modulation of Millimeter-Wave and THz Properties of IMPATT Sources via External Magnetic Field   Order a copy of this article
    by Partha Banerjee, Aritra Aharyya, Arindam Biswas, A.K. Bhattacharjee 
    Abstract: The modulation of millimeter-wave (mm-wave) and terahertz (THz) properties of impact avalanche transit time (IMPATT) sources under external steady magnetic field has been studied in this paper. The arrangement of magnetic field tuning of IMPATT oscillators by using external transverse steady magnetic field is referred to as magnetic field tunable avalanche transit time (MAGTATT) oscillators. The sensitivities of various static, large-signal and noise characteristics of Silicon based MAGTATT sources operating at mm-wave atmospheric window frequencies (94, 140 and 220 GHz) and two different THz frequencies (0.3 and 0.5 THz) have been studied. Comprehensive two-dimensional simulation models developed by the authors for evaluating static, large-signal and noise characteristics of MATATT diodes have been used for this purpose. The simulation results show that the above-mentioned magnetic field sensitivities of the device properties are significantly reduced with the increase of the operating frequency.
    Keywords: Atmospheric window frequency; MAGTATT; sensitivity analysis; THz.

  • Hardware Realization of an Intelligent Medical Image Watermarking   Order a copy of this article
    by Sandeep Bal, Sanjay Das, Soumadeb Dutta, Souma Das, Debamita Biswas, Abhishek Basu 
    Abstract: Digital intelligence features the competence to transmit medical image at swifter measure with a substantially superior computing relaxation. Hindrance to this is the up rise of copyright transgression problems. Medical image watermarking primarily focusses on embedding of the watermark in a concerned medical pictorial. The writers have concerned on the realm of Intelligent Medical Image Watermarking. Medicative images like USG, CT-Scan, MRI and X-rays are utilized. The intelligent binary mask used is primarily sectioned according to a fixed ratio and in accordance with a predefined intelligent schematic, the watermark bits are hidden in only a part of the sections to prevent distortion of the information pixels in the medical image. The entrenchment and excerpting epistemologies have been operationalized utilizing FPGA. The image testing parameter outcomes are discernibly persistent. Furthermore, an analogy of the proposed approach against few germane methods ensures the supremacy of the technique put forward.
    Keywords: Copyright Transgression; Medical Image Watermarking; Intelligent; Fixed ratio; FPGA.

  • Comparative performance analysis of FPGA based MAC unit using non-conventional number system in TVL domain for signal processing algorithm   Order a copy of this article
    by ANIRUDDHA GHOSH, Amitabha Sinha 
    Abstract: Today, the complication of binary digital hardware system is progressively growing. Due to this fact, new methodologies for efficiently describing and realizing the digital systems are explored in this paper. Multi valued logic methodology offers a few preferences over existing binary digital system. One of the well-known multivalued logic systems is Ternary Value Logic (TVL) System. Ternary system has a few essential points of interest over binary system. It is seen that all kind of Digital Signal Processing (DSP) algorithms widely use Multiply-Accumulate (MAC) operation for superior digital processing system. The multiplication and accumulation operations together can be performed by the MAC unit to avoid excessive overhead on the processor in terms of processing time and the on-chip memory consumptions. To implement high performance DSP algorithms MAC unit is used extensively. In current scenario, it is seen that non-conventional, non-binary number system-based architecture is also exhibited better performance. The example of such non-conventional, non-binary number systems are Ternary Residue Number Systems (TRNS) and Double Base Ternary Number System (DBTNS). In this paper a comparative study is made on performance analysis of MAC unit using various non-conventional, non-binary number system. All the architecture is mapped on field programmable gate array (FPGA) for analysis its performance.
    Keywords: Ternary Value Logic (TVL); Ternary Residue Number Systems (TRNS); TRNS Adder; Double Base Ternary Number Systems (DBTNS); DBTNS Multiplier; Multiply and Accumulate Unit (MAC); FPGA; DSP Algorithms.

  • Development of a Visible Light Communication System for reducing flicker in low data rate requirement   Order a copy of this article
    by SUJIT CHATTERJEE, BANTY TIRU 
    Abstract: For an efficient communication system, it is essential to remove each of the associated problems. In case of visible light communication (VLC) the illumination as well as transmission of data is done using the same light source. In this paper, the problem of flicker is dealt with, that occur at very low bit rates of the order of few bits per second (bps) and a health hazard. An experimental setup is developed to deal with flicker using frequency shift keying (FSK) to obtain a workable VLC system that is much more efficient than the commonly used on-off keying (OOK). The efficiency of the system in terms of distance between the transceivers, bit error rate (BER), bit rate and angle of coverage is found out. Using the arrangement, a flicker free transmission is obtained using a combination of light emitting diode (LED) and photodiode upto bit rates as low as 60 bps which is 62% lower than OOK. A decrease of BER by 86.8% and 85.3% compared to OOK is obtained at a distance of 30cm and 480cm respectively. The arrangement showed a better angular coverage than OOK. For FSK, a 10% increase in BER is found at an angle of 30 which shows considerable improvement over OOK, as the later showed the same error only at 10 (measured at 100 cm). The experimental arrangement is described in detail that would enable replication of the setup in low bit rate requirements.
    Keywords: visible light communication; light emitting diode; photodiode; frequency shift keying; on off keying.

  • Optoelectronic Properties of Multiple Quantum Barriers Nano-Scale Avalanche Photo Diodes   Order a copy of this article
    by Somrita Ghosh, Arindam Biswas, Aritra Acharyya 
    Abstract: The important optoelectronic properties like spectral response, excess noise characteristics, time and frequency response of multiple quantum barrier (MQB) nano-scale avalanche photodiodes (APDs) based on Si~3C-SiC material system have been studied in this paper. A self-consistent simulation method based on quantum drift-diffusion (SCQDD) model has been presented. Simulation results show that the Si~3C-SiC MQB nano-APDs are capable of detecting significantly longer wavelengths (up to 4000 nm) as compared to infrared flat Si APDs. The multiplication gain and excess noise factor (ENF) of the MQB APDs have been calculated by varying the number of quantum barriers (QBs). The numerically calculated ENF values of MQB APDs have been compared with the ENF of Si flat conventional APDs of similar dimensions and it is observed that the use of QBs leads to significant reduction in ENF of the APDs under similar biasing and illumination conditions. A very narrow rectangular pulse of pulse-width of 0.4 ps has been used as the input optical pulse having 850 nm wavelength incident on the p+-side of the MQB APD structures and corresponding current responses have been calculated by using a simulation method developed by the authors; finally the frequency responses of the devices are obtained via the Fourier transform of the corresponding pulse current responses in time domain. Simulation results show that MQB nano-APDs possess significantly faster time response and wider frequency response as compared to the flat Si nano-APDs under similar operating conditions.
    Keywords: Avalanche photodiode; multiple quantum barrier; photocurrent; quantum well; spectral response; excess noise; time and frequency response.

  • A COMPARATIVE STUDY ON THE EFFECTS OF TECHNOLOGY NODES AND LOGIC STYLES FOR LOW POWER HIGH SPEED VLSI APPLICATIONS   Order a copy of this article
    by INAMUL HUSSAIN, Saurabh Chaudhury 
    Abstract: As CMOS technology is scaled down, it faces critical challenges such as power dissipation, leakages,process related limitations, short channel effects, etc. The Carbon Nanotubes(CN) Field Effect Transistor (CNTFET) is a possible alternative to CMOS technology. MOSFET like CNTFETs has many advantages over conventional MOSFETs and are best for future VLSI applications. In this work, a comparative study has been carried out on the effects of technology nodes and logic styles on power dissipation, delay, leakages, etc. The technology nodes that are considered here are 90cm Bulk-Si MOSFET technology, 32nm Bulk-Si MOSFET technology and 32nm CNTFET technology. The logic families considered here are the conventional Complementary Metal Oxide Semiconductor (CMOS), Complementary Pass transistor Logic (CPL) and Transmission Gate (TG) logics. To study the effect of technology nodes on leakage, power and delay, the digital circuits considered are NAND, NOR, XOR and MUX gates. A simulation has been carried out at Synopsys HSPICE tool with the mentioned technology nodes to calculate the worst case delay, total power consumption and power delay product (PDP). This work provides the best choice of technology node and logic style for low-power, high-speed VLSI applications. It is observed that at 32nm CNTFET technology, the least power, delay and PDP are observed as 15.5nW, 3.11ps and 0.048aJ respectively. Best on performances, it is seen that CNTFET based logics are superior compared to other logic families at different technology nodes.
    Keywords: Logic Styles; Technology; CMOS; CPL; TG; CNTFET; PDP.

  • A Simple Method for Study of Effect of Kerr Nonlinearity on Effective Core Area, Index of Refraction and Fractional Modal Power through the Core of Monomode Graded Index Fiber   Order a copy of this article
    by ANUP KUMAR MAITI 
    Abstract: Using the simple power series expression for fundamental modal field derived by Chebyshev technique, we present investigation of some important propagation parameters like effective core area, index of refraction and fractional modal power guided through the core of single mode graded index fiber in presence of Kerr nonlinearity. In absence of nonlinearity, the said power series expression leads to prescription of analytical expressions of the concerned propagation parameters. Employing those analytical expressions, we apply iterative method in order to evaluate the said parameters in presence of Kerr nonlinearity. Choosing some typical single-mode step and parabolic index fibers for our study, we verify that the results obtained by our simple formalism match excellently with the exact results which are obtainable by applying rigorous finite element technique. This excellent agreement attests to the accuracy of our formalism. Further, our formalism requires little computation in the context of evaluation of the said parameters. Accordingly, our formalism can be considered as a simple but accurate alternative to the existing complicated methods available in literature. Thus this user friendly but accurate formalism will benefit the system engineers in respect of selection of suitable fiber in which modal noise due to nonlinearity is minimum.
    Keywords: Graded index fiber; cladding decay parameter; V number; effective core area; index of refraction; Confinement of modal power; Chebyshev technique; Kerr nonlinearity.

  • Development of a Highway Driving Events Identification and Classification using Smartphone   Order a copy of this article
    by Munaf Al-Din 
    Abstract: The emergence of new vehicular applications such as driving monitoring systems, driving behavior and style analysis, driving intension modelling and vehicle telematics, have greatly contributed to the developments of road safety analysis, intelligent transportation systems and microscopic traffic simulation for smart cities. Identification and classification of driving events represents a fundamental necessity for all these systems and in fact they represent the backbone module for any successful application. In recent years, the use of smartphones has grown significantly due to the increase in their computational capabilities and the integration of advanced sensor technologies. This prevalence of smartphones and advances in machine learning techniques have rapidly transformed the field of vehicular applications to be easily accessible, widely available, and implemented at low cost. Nevertheless, the accuracy of these smartphones-based applications critically depends on the calibration and pre-processing techniques that intended to mitigate problems associated smartphones sensors. This study proposes and investigates a set of simple calibration and pre-processing techniques used to enhance the accuracy of a smartphone-based driving event detection and classification system. Furthermore, paper presents a simple and effective approach for the identification and classification of driving events. The approach is based on separating events identification process from the classification process. The Dynamic Time Warping (DTW) technique is used for the identification, while statistical and time metrics features are used for the classification. Results obtained show a high accuracy rate of the proposed system.
    Keywords: Smartphone sensors calibration; Driving events; Detection and Classification techniques.

  • A Comparative Analysis of the Short-Channel Effects of Double-Gate, Tri-Gate and Gate-All-Around MOSFETs   Order a copy of this article
    by Shankaranand Jha, Santosh Kumar Choudhary 
    Abstract: The electrical characteristics of metal-oxide semiconductor field-effect transistors (MOSFETs) deteriorate with the scaling of device dimensions. To further the miniaturization and to have more control over the channel, one of the promising solutions is the Multi-gate (MG) architecture of MOSFET. In the present work we have investigated various MG devices like Double-gate (DG), Tri-gate (TG) and Gate-All-Around (GAA) MOSFETs by varying their physical parameters and have compared the associated short-channel effects (SCEs). For a specific SCE, a common mathematical expression has been used for all the MOSFET architectures. The analytical results have been found to be in reasonable agreement with the simulated/fabricated devices.
    Keywords: Multi-gate (MG); Double-gate (DG); Tri-gate (TG); Gate-All-Around (GAA); MOSFET; short-channel effects; quantum mechanical effect.

  • Performance enhancement of double-gate tunnel FETs using dual-metal and graded-channel configuration   Order a copy of this article
    by Chandan Pandey, Saurabh Chaudhury 
    Abstract: In this paper, a novel structure of Tunnel FET device has been proposed with graded-channel and dual-metal structure showing a huge reduction in ambipolar conduction. With the help of two-dimensional numerical simulations, it has been shown that a graded-channel configuration in DG-TFETs with heavily-doped region adjacent to drain terminal changes the alignment of energy band profile of channel and drain region at tunneling interface between them resulting to an increment in tunneling width at same interface. Eventually, a significant reduction in ambipolar conduction has been found in the device. Furthermore, it has also been demonstrated that gate metal with lower work function on drain side along with heavily-doped channel region can suppress the ambipolarity up to a great extent in DG-TFETs. Moreover, it has been shown that the ambipolar conduction can be eliminated in the proposed device even if drain region is doped with same concentration as being used for source.
    Keywords: Ambipolar conduction; graded channel; subthreshold swing; tunneling width; tunneling FETs.

Special Issue on: DevIC 2019 Advanced Nanoscale Devices/MEMS/NEMS for Application in Microsystems

  • Wideband Piezoelectric Energy Harvester design using parallel connection of multiple beams   Order a copy of this article
    by Sourav Naval, Prasun Kumar Sinha, Nikhil Kumar Das, Ashutosh Anand, Sudip Kundu 
    Abstract: Microelectromechanical System (MEMS) based piezoelectric energy harvesters have been successful in harvesting optimum power output from the low-frequency vibrations in the environment. Their ability to operate over a wide range of frequencies is quite essential because the vibrations occurring in the environment are random and occur at different frequencies. In this paper, we try to increase the operating bandwidth of a MEMS-based energy harvester using parallel connection of multiple cantilever beam structures. The operating bandwidth of the energy harvester increases as the number of beams is increased, provided the resonant frequencies of the beams differ from each other by a sufficient margin. Here we consider the operating bandwidth of the energy harvesters to be the range of frequencies over which they generate an output voltage greater than or equal to 1 V. The single beam, parallelly connected two-beam, three-beam and four-beam structures have an operating bandwidth of 26 Hz, 27 Hz, 28 Hz, and 31 Hz, respectively. Thus, the bandwidth of parallelly connected four-beam structure is wider than that of single beam structure by 5 Hz.
    Keywords: MEMS; Piezoelectric Energy Harvesters; Wideband; Multi-beam; COMSOL.

  • Vertically-Stacked Silicon Nanosheet Field Effect Transistors at 3nm Technology Nodes Simulation at Nanoscale   Order a copy of this article
    by Eleena Mohapatra, Taraprasanna Dash, Suprava Dey, Jhansirani Jena, Sanghamitra Das, Chinmay Maiti 
    Abstract: Feasibility of vertically-stacked silicon nanosheet FETs (SNS-FETs) for extreme scaling at 3nm technology node are investigated for the first time as one of the possible solutions to continue to enhance the performances of the CMOS technology. In this work, we use 3-D predictive simulations to study the performance potential of SNS-FETs at 3nm technology node. With the end of happy scaling era, change of device architecture has raised integration complexity along with severe short channel effects, mobility degradation, variability and quantum tunneling leakage. These are the major challenges as device dimensions are scaled for ultimate scaling below 7nm. Towards low power and high speed (More-than-Moore applications), nanowires and nanosheet transistors are being proposed. Today, the possibility of FinFET downscaling is still open and more than ever alternatives to CMOS transistors, such as, vertically-stacked SNS-FETs are showing their potential to surpass FinFETs. Variability due to metal grain granularity (MGG) is critical at 3nm technology nodes, as such, the device threshold voltage variation due to MGG is examined for single nanosheet NS-FET. Finally, we calculate the mean and standard deviation of these parameters to quantify the variability.
    Keywords: Nanosheet FETs (NS-FETs); quantum confinement; technology computer aided design (TCAD); drift diffusion; density-gradient; metal grain granularity.

Special Issue on: DevIC 2019 Advanced Nanoscale Devices/MEMS/NEMS for Application in Microsystems

  • Line outage identification using comparison of bus power mismatch considering PMU outage
    by MEHEBUB ALAM, Shubhrajyoti Kundu, Siddhartha Sankar Thakur, Sumit Banerjee 
    Abstract: In this study, a novel algorithm for line outage identification is developed utilizing the PMU provided phasor angles. For various outage cases the simulated bus power mismatches (SBPM) using bus susceptance matrix of full network are to be stored. As soon as actual outage occurs the bus power mismatches are computed using PMU provided pre outage and post outage phasor angles.The proposed algorithm is based on comparison of simulated bus power mismatches with computed bus power mismatches (CBPM) through L-2 norm minimization approach. Additionally, optimal PMU placement issue is also addressed to ensure the network observability in case of PMU outage. Moreover, random Gaussian noise with zero mean and standard deviation (SD) from 1% to 5% is incorporated in the developed model to reflect the measurement error in real power network. New performance indices namely estimation accuracy excluding critical cases( EAECC ) and estimation accuracy including critical cases (EAICC) is introduced to test the efficiency of the algorithm by comparing with existing methods. Simulation was carried out on standard IEEE 5 bus, 14 bus, 30 bus, 57 bus and 118 bus system to check the viability and applicability of the proposed methodology. The obtained test results are found to be competitive with the existing methods.
    Keywords: Phasor measurement unit (PMU), line outage identification (LOI), optimal PMU placement, noise, power systems