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Sunflower Seed Invigoration by Chemical Manipulation
Chandan Kumar Pati,Aloke Bhattacharjee
Agricultural Journal , 2013, DOI: 10.3923/aj.2012.26.31
Abstract: Sunflower (Helianthus annuus L. cv. Morden) seeds lose viability at a rapid pace under accelerated aging condition. Pretreatment of the seeds with salicylic acid and ascorbic acid for 8 h before imposition of Accelerated Aging (AA) treatment in desiccator (99.1% RH and 32±2°C) or continuous treatment of the seeds with eucalyptus oil vapour for 60 days in a separate desiccator under the same Aging condition slowed down the Aging-induced rapid loss of germination. Plant performance was found to be much better when they were developed from seeds which underwent chemical pretreatment measured in terms of field emergence capacity, root length, shoot length, fresh weight and dry weight of plants. Plant potential was also higher in the pretreatments as evidenced from the treatment-induced higher chlorophyll, protein, DNA and RNA levels as well as activities of catalase and peroxidase enzymes in spite of adverse storage situation. Yield attributes like diameter and fresh weight of capitulum, seed number per capitulum, 1000 seed weight were found significantly higher in plants raised from pretreated seed samples. Results therefore, pointed out that in spite of experiencing accelerated Aging treatment, the chemical-pretreated seeds retained higher seed vigor and produced healthier plants which resulted in enhancement of crop yield.
Effect of underlap and gate length on device performance of an AlInN/GaN underlap MOSFET
Effect of Underlap and Gate length on device performance of AlInN/GaN Underlap MOSFET
Hemant Pardeshi,Sudhansu Kumar Pati,Godwin Raj,N Mohankumar,Chandan Kumar Sarkar,
Hemant Pardeshi,Sudhansu Kumar Pati,Godwin Raj,N Mohankumar,Chandan Kumar Sarkar
半导体学报 , 2012,
Abstract: We investigate the performance of an 18 nm gate length AlInN/GaN heterostructure underlap double gate MOSFET, using 2D Sentaurus TCAD simulation. The device uses lattice-matched wideband Al0.83In0.17N and narrowband GaN layers, along with high-k Al2O3 as the gate dielectric. The device has an ultrathin body and is designed according to the ITRS specifications. The simulation is done using the hydrodynamic model and interface traps are also considered. Due to the large two-dimensional electron gas (2DEG) density and high velocity, the maximal drain current density achieved is very high. Extensive device simulation of the major device performance metrics such as drain induced barrier lowering (DIBL), subthreshold slope (SS), delay, threshold voltage (Vt), Ion/Ioff ratio and energy delay product have been done for a wide range of gate and underlap lengths. Encouraging results for delay, Ion, DIBL and energy delay product are obtained. The results indicate that there is a need to optimize the Ioff and SS values for specific logic design. The proposed AlInN/GaN heterostructure underlap DG MOSFET shows excellent promise as one of the candidates to substitute currently used MOSFETs for future high speed applications.
Flicker and thermal noise in an n-channel underlap DG FinFET in a weak inversion region
Study of Flicker and Thermal Noise in n-channel Underlap DG FinFET in weak inversion Region
Sudhansu Kumar Pati,Hemant Pardeshi,Godwin Raj,N Mohankumar,Chandan Kumar Sarkar,
Sudhansu Kumar Pati,Hemant Pardeshi,Godwin Raj,N Mohankumar,Chandan Kumar Sarkar
半导体学报 , 2013,
Abstract: We propose an analytical model for drain current and inversion charge in the subthreshold region for an underlap DG FinFET by using the minimum channel potential method, i.e., the virtual source. The flicker and thermal noise spectral density models are also developed using these charge and current models expression. The model is validated with already published experimental results of flicker noise for DG FinFETs. For an ultrathin body, the degradation of effective mobility and variation of the scattering parameter are considered. The effect of device parameters like gate length Lg and underlap length Lun on both flicker and thermal noise spectral densities are also analyzed. Increasing Lg and Lun, increases the effective gate length, which reduces drain current, resulting in decreased flicker and thermal noise density. A decrease of flicker noise is observed for an increase of frequency, which indicates that the device can be used for wide range of frequency applications.
Mixing and Segregation Characteristics of Binary Granular Material in Tapered Fluidized Bed: A CFD Study  [PDF]
Harekrushna Sutar, Chandan Kumar Das
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.44029
Abstract: The particle flow pattern, mixing and granule segregation in a tapered fluidized bed have been studied along with the hydrodynamics. At first the bed of varying total mass and granule fractions is fluidized then the bed is defluidized to freeze the composition, the bed is sectioned to layers and the composition in each layer is determined by sieving. Materials used in the present study are dolomite and glass beads with different B.S.S Sizes. A series of unsteady, three fluid CFD simulations were performed using FLUENTTM 6.2. Simulation parameters viz. solution technique, grid, maximum packing fraction and operating conditions like gas velocity were investigated for relative effects on particle mixing and segregation. Good arrangement of solid volume fraction profile was obtained between the experimental results and simulation results for regular particles.
Static Test Study on Linear Induction Motor
Chandan Kumar
International Journal of Computer and Electrical Engineering , 2013, DOI: 10.7763/ijcee.2013.v5.707
Abstract: Linear Induction Motors (LIMs) have got potential to replace the age old belt-pulley driven systems and the likes, which are in use for conversion of rotary to linear motion in most of the applications. In the present work a 3- phase Single sided longitudinal LIM (50Hz, 4 pole, 440V, 9KVA, and 52.4km/hr) has been designed, fabricated and successfully tested on a test track in the Indian Railways Institute of Electrical Engineering Nasik (IRIEEN). In this paper the test results of the various standard experiments conducted on the machine are described.
Polarization and Breakdown Analysis of AlGaN Channel HEMTs with AlN Buffer  [PDF]
Godwin Raj, Mohan Kumar, Chandan Kumar Sarkar
World Journal of Condensed Matter Physics (WJCMP) , 2015, DOI: 10.4236/wjcmp.2015.53024
Abstract: We have demonstrated the first carrier density model for AlGaN channel with AlN buffer using spontaneous and piezoelectric polarization comparison with experimental and theoretical results. From the results we proved that the formation of 2DEG in undoped structure relied both on spontaneous and piezoelectric polarization. The electron distribution of Al concentration (0 < x < 0.5) was measured for both AlGaN channel and barrier. Barrier thickness assumed between 20 and 25 nm for validating the experimental results. The carrier concentration was observed at the specific interface of the N- and Ga-face by assuming x1, x2 = 0. The model results are verified with previously reported experimental data.
Ultra Wideband Microstrip Diamond Slotted Patch Antenna with Enhanced Bandwidth  [PDF]
Chia Ping Lee, Chandan Kumar Chakrabarty
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2011, DOI: 10.4236/ijcns.2011.47057
Abstract: An Ultra Wideband (UWB) microstrip diamond slotted patch antenna with enhanced bandwidth is presented in this paper. The proposed antenna is simulated in CST Microwave Studio and fabricated for measurements. Its simulated result displays impedance bandwidth from 3.28 GHz to 19.64 GHz, whereas the measured result displays the frequency region from 2.01 GHz to 18.67 GHz. The antenna complies with the return loss of S11 < –10 dB and Voltage Standing Wave Ratio (VSWR) < 2 throughout the impedance bandwidth. Details of the antenna design and related results such as phase angle, input impedance and radiation patterns are discussed in this paper. This antenna has surpassed the bandwidth of UWB requirement, which is from 3.1 GHz to 10.6 GHz, and exhibits good UWB characteristics.
X-Ray Diffraction Studies of Rice Husk Ash—An Ecofriendly Concrete at Different Temperatures  [PDF]
Patnaikuni Chandan Kumar, Nutulapati V. S. Venugopal
American Journal of Analytical Chemistry (AJAC) , 2013, DOI: 10.4236/ajac.2013.48046
Abstract:

In the majority of rice producing countries, much of the husk produced from the processing of rice is either burnt or dumped as waste. Rice husks are one of the largest readily available but most under-utilized biomass resources, being an ideal fuel for electricity generation. In this communication the author reported the X-ray diffraction studies on rice husk ash (RHA) concrete samples heated at 300℃ and 1000℃ which were compared and observed that at 300℃ the inner surface of the specimen shows an extra compound. Copper Iron Lead Telluride Cu3FePbTe4 along with SiO2, Al5Fe2ZnO4 was present on the surface which also and might be responsible for imparting additional strength to 7.5% RHA concrete at 300℃. The X-ray diffraction studies of samples exposed to 1000℃ on temperature showed that the additional chemical compounds formed at lower temperatures were not found at 1000℃ at outer and inner surfaces of the sample indicating its possible reason for

Grafting Vinyl Monomers onto Chitosan:IV:Graft Copolymerized of Acrylicacid onto Chitosan Using Ceric Ammonium Nitrate as the Initiator— Characterization and Antimicrobial Activities  [PDF]
Manoj Kumar Pati, Padmalochan Nayak
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.212232
Abstract: Acrylicacid was grafted onto chitosan by using the ceric ammonium nitrate as the initiator. The effect of initiator concentration, monomer concentration, time & temperature on % G and % GE were studied. The grafted samples were characterized using FTIR, TGA, SEM and XRD methods. From the FTIR data it was ascertained that grafting has occurred considerably. The morphology of the grafted polymer was observed from the SEM picture. The thermal analysis indicated the different stages of degradation of the grafted copolymer. Evidence of grafting was obtained from comparison of SEM, XRD, and FTIR of the grafted and nongrafted chitosan as well as solubility characteristics of the products. The antibacterial and antifungal activities of the grafted polymer have also been investigated.
A Brief Review on Dynamics of a Cracked Rotor
Chandan Kumar,Vikas Rastogi
International Journal of Rotating Machinery , 2009, DOI: 10.1155/2009/758108
Abstract: Fatigue crack is an important rotor fault, which can lead to catastrophic failure if undetected properly and in time. Study and Investigation of dynamics of cracked shafts are continuing since last four decades. Some review papers were also published during this period. The aim of this paper is to present a review on recent studies and investigations done on cracked rotor. It is not the intention of the authors to provide all literatures related with the cracked rotor. However, the main emphasis is to provide all the methodologies adopted by various researchers to investigate a cracked rotor. The paper incorporates a candid commentary on various methodologies. The paper further deals an extended Lagrangian formulation to investigate dynamics of cracked rotor.
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