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A CONTINUED FRACTION FROM UNORGANIZED PORTIONS OF RAMANUJAN’S NOTEBOOKS AND PARTITIONS
Bhaskar Srivastava 충청수학회 2005 충청수학회지 Vol.18 No.1
In this paper, we consider the finite form of the continued fraction found in the unorganized material, Entry 9 [2], and give the sum of n terms. We give the n th convergent series in two ways-one by simple expansion and the other by using partition theory.
Seasonal Variability of Sonic Layer Depth in the Central Arabian Sea
Bhaskar, TVS Udaya,Swain, Debadatta,Ravichandran, M The Korean Society of Oceanography 2008 Ocean science journal Vol.43 No.3
The seasonal variability of sonic layer depth (SLD) in the central Arabian Sea (CAS) (0 to $25^{\circ}N$ and $62-66^{\circ}E$) was studied using the temperature and salinity (T/S) profiles from Argo floats for the years 2002-2006. The atmospheric forcing responsible for the observed changes was explored using the meteorological data from NCEP/NCAR and Quickscat winds. SLD was obtained from sound velocity profiles computed from T/S data. Net heat flux and wind forcing regulated SLD in the CAS. Up-welling and down-welling (Ekman dynamics) associated with the Findlater Jet controlled SLD during the summer monsoon. While in winter monsoon, cooling and convective mixing regulated SLD in the study region. Weak winds, high insolation and positive net heat flux lead to the formation of thin, warm and stratified sonic layer during pre and post summer monsoon periods, respectively.
A STUDY OF THE BILATERAL FORM OF THE MOCK THETA FUNCTIONS OF ORDER EIGHT
Bhaskar Srivastava 충청수학회 2005 충청수학회지 Vol.18 No.2
We give a generalization of bilateral mock theta functions of order eight and show that they are F q -functions. We also give an integral representation for these functions. We give a relation between mock theta functions of the first set and bilateral mock theta functions of the second set.
REDUCIBILITY, MULTIBASIC EXPANSION AND INTEGRAL REPRESENTATION FOR BASIC APPELL FUNCTIONS
Bhaskar Srivastava 충청수학회 2005 충청수학회지 Vol.18 No.2
We give bibasic expansion for basic Appell functions Φ (1) and Φ (2) , and their integral representations. We also give a continued fraction representation for Φ (2) .
Experimental and computational study on flow over stepped spillway
Bhaskar Jyoti Medhi,Anugrah Singh,Ashish Kumar Thokchom,Sadhan Mahapatra 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.5
The flow over a stepped spillway has complex nature, and its characteristics are remarkably different from other kinds of spillways. This study conducts experimental investigations and numerical simulations on the flow behavior (velocity, concentration profile) and macroscopic features (interface position and self-aeration) of water and neutrally buoyant suspension of non-colloidal particles in a stepped spillway with uniform steps. The development of nappe, transition, and skimming flow regimes is experimentally investigated by using a flow visualization technique. The inception point related to air entrainments is identified in the experimental study. The inception point usually moves downstream and increases the length of the non-aerated region with the increase of flow rate. Results of numerical and experimental studies indicate that a vortex is formed in the triangular cavity below the pseudo-bottom line (imaginary line joining two adjacent step edges) in the stepped channel. This vortex rotates in a clockwise direction for a short time period and returns to the main flow to move downward in the channel. The velocity vector map from numerical simulation predicts the maximum velocity in the middle portion of the spillway, that is, near the pseudo-bottom line. A volume of fluid model coupled with a standard k–e turbulence model is used in the CFD simulations to predict the location of the air–water air-suspension interface. The results are compared with experimental measurements. The calculated interface position agrees well with the experimental measurements. The migration and transport of particles are evaluated based on a diffusive flux model of shear induced particle migration. The contour map for velocity and particle concentration shows a remarkable increase in particle concentration near the air-suspension interface.
Enhanced Red Emission from YVO_4:Eu^(3+) Nano Phosphors Prepared by Simple Co-precipitation Method
Bhaskar Kumar Grandhe,Vengala Rao Bandi,Kiwan Jang,Sundara Ramaprabhu,이성수,Jung-Hyun Jeong 대한금속·재료학회 2011 ELECTRONIC MATERIALS LETTERS Vol.7 No.2
Eu^(3+) doped YVO4 nano phosphors were synthesized by adopting a simple Co-Precipitation Method (CPM). In order to compare and evaluate this method’s potentiality, we prepared the same phosphor by using a conventional Solid State Reaction method (SSR). X-Ray Diffraction (XRD) profile confirms the tetragonal nature of Eu^(3+) doped YVO4 nano phosphors. The efficiency of the prepared phosphors was analyzed by means of its emission spectral profiles. We also observed a rich red emission from the prepared phosphors under a Ultra-Violet (UV) source. Such luminescent powders are expected to be applied as red phosphors in display device applications. In addition, Scanning electron microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDS), Fourier-Transform IR spectroscopy (FTIR), and Raman Spectrum were also used to characterize the synthesized phosphor.
Bhaskar Ganguly,Nirbhay Kumar,Abul H. Ahmad,Sunil K. Rastogi 고려인삼학회 2018 Journal of Ginseng Research Vol.42 No.4
Background: Roots of Withania somnifera (WS) are a celebrated medicinal ingredient in Ayurvedic and many other indigenous systems of medicine. The present study investigates the effect of the phytochemical composition of the extracts on their antioxidant and reducing activities. Methods: WS roots were extracted with water, acetone, aqueous methanol (1:1), and methanol:- chloroform:water (1:1:1) to obtain aqueous, acetone, hydro-methanolic, and methanolechloroformewater extracts. Thereafter, phytochemical constitution and antioxidant and reducing activities of the extractswere compared using different qualitative and quantitative tests. Results: Maximum extraction recovery was obtained with 50% aqueous methanol whereas extraction with acetone yielded the poorest recovery. Methanolechloroformewater extract had the highest content of phytochemical constituents, except tannins, and also exhibited the highest antioxidant and reducing activities. Conclusion: Phytochemical composition and antioxidant and reducing activities of the extracts were positively associated with the use of organic solvents during the extraction process. Alkaloids and flavonoids were the most important contributors in the antioxidant and reducing activities of the extracts.
Bhaskar Awadhiya,Pravin N. Kondekar,Sameer Yadav,Pranshoo Upadhyay 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.3
In this paper, we have discussed threshold voltage and drain induced barrier lowering in NCFET. Threshold voltage in NCFET is lower as compared to MOSFET which is mainly because of negative equivalent oxide capacitance in NCFET. Further, we have discussed drain induced barrier lowering in NCFET and MOSFET. An increase in drain bias in MOSFET leads to decrease in threshold voltage and an increase in leakage current whereas in NCFET increase in drain bias leads to increase in threshold voltage and decrease in leakage current. We have obtained a positive value of DIBL factor for MOSFET and negative value for NCFET.
Bhaskar Parida,Seonghoon Jeong,Hyunsoo Kim 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.7
The effects of post-thermal diffusion of Al into heavily Al-doped ZnO (AZO) on its electrical, optical, and structural properties were investigated. Notably, the thermal diffusion of Al led to a significant enhancement of the optical transmittance-e.g., the transmittances at 550 nm were 90.4% and 96.7% before and after Al thermal diffusion, respectively. The structural analysis revealed that the improved optical transmittance was due to the combined effects of improved crystallinity, smoother surface, and the presence of transparent Al-O. However, the electrical properties of the AZO films after Al thermal diffusion were degraded-e.g., the sheet resistance was increased by 24% after thermal diffusion, which might be attributed to the generation of internal defects due to the heavy Al doping.
Bhaskar Parida,김근주,최재호,Srikanta Palei,곽승종 한국전기전자재료학회 2015 Transactions on Electrical and Electronic Material Vol.16 No.4
We investigated nanotextured Si solar cells using the silver-assisted chemical etching process. The nanotexturing process is very sensitive to the concentration of chemical etching solution. The high concentration process results in a nanowire formation for the nanosurfaces and causes severe surface damage to the top region of the micropyramids. These nanowires show excellent light absorption in photoreflectance spectra and radiative light emission in photoluminescence spectra. However, the low concentration process forms a nano-roughened surface and provides high minority carrier lifetimes. The nano-roughened surfaces of the samples show the improved electrical cell properties of quantum efficiency, conversion efficiency, and cell fill factor due to the reduction in the formation of the over-doped dead layer.