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- 저자 : V. Kishore (검색결과 35 건)
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Pawar, Sambhaji M.,Inamdar, Akbar I.,Gurav, Kishor V.,Shin, Seung Wook,Gwak, Jihye,Jo, Yongcheol,Yun, JaeHo,Pak, Hisun,Kwon, Sehan,Kim, Hyungsang,Kim, Jin Hyeok,Im, Hyunsik Elsevier 2015 CURRENT APPLIED PHYSICS Vol.15 No.2
<P>We have synthesized an efficient Cu2ZnSn(SxSe1-x)(4) (CZTSSe) absorbers by using single-step rapid thermal sulfo-selenization process of sputtered stack metallic precursor (Zn/Sn/Cu) films. The structural and morphological studies confirm that the suitability of the rapid thermal sulfo-selenization process for the synthesis of a CZTSSe absorber without any secondary phases with large grains. The annealing atmosphere with a mixed-chalcogen source enhances the grain growth of the CZTSSe absorber as compared with pure Cu2ZnSnS4 (CZTS) and Cu2ZnSnSe4 (CZTSe) absorbers. The CZTSSe thin film solar cell shows the best conversion efficiency of similar to 7%. (C) 2014 Elsevier B. V. All rights reserved.</P>
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Vibhav K. Saraswat,K. Singh,N.S. Saxena,V. Kishore,T.P. Sharma,P.K. Saraswat 한국물리학회 2006 Current Applied Physics Vol.6 No.1
Measurements ofIV characteristics and DC electrical conductivity of Se85. xTe15Sbx (wherex = 2, 4, 6, 8 and 10) glassy thinpellets, prepared by well established melt quenching technique in bulk (pellets of diameter 12mm and thickness. 1m were pre-pared under a constant load of 5 tons), have been carried out at room temperature using Keithley High Resistance Meter/Electrom-eter 6517A. For the recording ofIV characteristics, this equipment was used in FVMI (Force Voltage Measure Current) mode. It isIV characteristics that the glass containing 4 at. wt.% of Sb has the minimum resistance allowing maximumcurrent through the sample as compared to the other at. wt.% of Sb contents e.g. 2, 6, 8 and 10.At 4 at. wt.% of Sb, conductivityrises to 76% of the value obtained for 2 at. wt.% of Sb. Composition dependence of DC conductivity is discussed in terms of thebond formation between Se and Sb at dierent compositions. The conduction mechanism is discussed qualitatively on the basisof PooleFrenkel conduction mechanism. Also the linear relation between ln (I) and V1/2veries that the conduction mechanismis of PooleFrenkel type for both low and high voltage range. The deviation of ohmic behaviour at lower voltage range towardsthe non-ohmic at higher voltage range is due to the high voltage induced temperature eects in the sample.
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P.V.V.Kishore,M.V.D.Prasad 보안공학연구지원센터(IJSEIA) 2016 International Journal of Software Engineering and Vol.10 No.2
To extract hand tracks and hand shape features from continuous sign language videos for gesture classification using backpropagation neural network. Horn Schunck optical flow (HSOF) extracts tracking features and Active Contours (AC) extract shape features. A feature matrix characterizes the signs in continuous sign videos. A neural network object with backpropagation training algorithm classifies the signs into various words sequences in digital format. Digital word sequences are translated into text with matching and the suiting text is voice translated using windows application programmable interface (Win-API). Ten signers, each doing sentences having 30 words long tests the performance of the algorithm by computing word matching score (WMS). The WMS is varying between 88 and 91 percent when executed on different cross platforms on various processors such as Windows8 with Inteli3, Windows8.1 with inteli3 and windows10 with inteli3 running MATLAB13(a).
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P. V. V. Kishore,M. V. D. Prasad 보안공학연구지원센터 2015 International Journal of Software Engineering and Vol.9 No.12
To extract hand tracks and hand shape features from continuous sign language videos for gesture classification using backpropagation neural network. Horn Schunck optical flow (HSOF) extracts tracking features and Active Contours (AC) extract shape features. A feature matrix characterizes the signs in continuous sign videos. A neural network object with backpropagation training algorithm classifies the signs into various words sequences in digital format. Digital word sequences are translated into text with matching and the suiting text is voice translated using windows application programmable interface (Win-API). Ten signers, each doing sentences having 30 words long tests the performance of the algorithm by computing word matching score (WMS). The WMS is varying between 88 and 91 percent when executed on different cross platforms on various processors such as Windows8 with Inteli3, Windows8.1 with inteli3 and windows10 with inteli3 running MATLAB13(a).
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V. V. Kishor Kumar,Biju T. Kuzhiveli 대한설비공학회 2017 International Journal Of Air-Conditioning and Refr Vol.25 No.2
A regenerative heat exchanger is the most vital component in the design of a Stirling cryocooler. Computational Fluid Dynamics (CFD) is the best technique for the design and prediction of the performance of a regenerator. The reliability of the simulation results depend on the accuracy of the Darcy permeability KK and Forchheimer’s inertial coefficient CfCf used for modeling the momentum transfer in porous media. Usually these coefficients are calculated from pressure drop data obtained from experiment. Because of the requirement of sophisticated equipments for the measurement and analysis of data, experimental study becomes expensive. This paper proposes a friction factor correlation-based method for the prediction of directional permeability and Forchheimer’s inertial coefficient of wire mesh structures relevant to Stirling cryocooler. The friction factor for the flow of helium through #325, #400 and #635 SS wire matrices with porosities of 0.6969, 0.6969 and 0.6312 are calculated using standard correlations and compared with the friction factor given by Clearman et al. based on steady flow experimental study. The friction factor obtained from Blass and Tong/London correlations are in agreement with that of Clearman et al. The viscous and inertial resistances are calculated from the friction factor obtained from Blass and Tong/London correlations. Using these values, the regenerator was modeled as a porous media in Fluent. From the steady flow simulation, pressure drop at different mass flow rates (0.08–1.44g/s) is obtained. The maximum deviation of predicted pressure drop from the reported experimental data is 15.14%. The Darcy permeability KK and Forchheimer’s inertial coefficient CfCf obtained from correlation-based method was used for modeling the oscillatory flow of helium through a #400 regenerator. The pressure amplitude and phase at regenerator exit were obtained at different frequencies. The average deviation of predicted pressure amplitude from the experimental data is 15.83%. The model could predict the phase angle also accurately. Therefore, the proposed method can be used to calculate the hydrodynamic parameters of woven wire screen matrices applied to Stirling cryocoolers.
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THE DOUBLE FUZZY ELZAKI TRANSFORM FOR SOLVING FUZZY PARTIAL DIFFERENTIAL EQUATIONS
Kishor A. Kshirsagar,V. R. Nikam,S. B. Gaikwad,S. A. Tarate 충청수학회 2022 충청수학회지 Vol.35 No.2
The Elzaki Transform method is fuzzified to fuzzy Elzaki Transform by Rehab Ali Khudair. In this article, we propose a Double fuzzy Elzaki transform (DFET) method to solving fuzzy partial differential equations (FPDEs) and we prove some properties and theorems of DFET, fundamental results of DFET for fuzzy partial derivatives of the $n^{th}$ order, construct the Procedure to find the solution of FPDEs by DFET, provide duality relation of Double Fuzzy Laplace Transform (DFLT) and Double Fuzzy Sumudu Transform(DFST) with proposed Transform. Also we solve the Fuzzy Poisson's equation and fuzzy Telegraph equation to show the DFET method is a powerful mathematical tool for solving FPDEs analytically.
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Review of regenerator materials applicable for miniature Stirling cryocoolers
Kishor Kumar V. V. 대한설비공학회 2021 International Journal Of Air-Conditioning and Refr Vol.29 No.4
Miniature Stirling coolers are preferred to provide cryogenic cooling for Infra-Red (IR) sensors used for communication, military and space applications. They provide 0.25-1.5 W of cooling effect at 80 K. Miniature Stirling coolers used for space applications are time tested, reliable and have the maximum COP compared to other types of coolers. Helium is used as the working fluid because of its low boiling point, high thermal conductivity, high ratio of specific heats and inert gas properties.A regenerator is the primary heat exchanger in the system which periodically exchanges heat with the cold and hot gases passing through the regenerator material. The effectiveness of the regenerator is the most important parameter influencing the cooling effect produced by the system. For the optimum performance of the cryocooler, the regenerator should have maximum heat transfer area, minimum void volume, minimum pressure drop, large heat capacity ratio between matrix material and gas and minimum longitudinal conduction. Since some of these requirements are conflicting in nature, the design of the regenerator becomes a challenge in the overall design of the cooler. A state of the art review of regenerator materials, design and operation are presented in this paper. The different sources of regenerator losses and the issues related to regenerator design and optimization are discussed in detail. Results of various experimental and numerical investigations conducted on Stirling regenerator are discussed and the recent developments in material selection and design are highlighted.
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Damage progression study in fibre reinforced concrete using acoustic emission technique
Nawal Kishor Banjara,Saptarshi Sasmal,V. Srinivas 국제구조공학회 2019 Smart Structures and Systems, An International Jou Vol.23 No.2
The main objective of this study is to evaluate the true fracture energy and monitor the damage progression in steel fibre reinforced concrete (SFRC) specimens using acoustic emission (AE) features. Four point bending test is carried out using pre-notched plain and fibre reinforced (0.5% and 1% volume fraction) - concrete under monotonic loading. AE sensors are affixed at different locations of the specimens and AE parameters such as rise time, AE energy, hits, counts, amplitude and duration etc. are obtained. Using the captured and processed AE event data, fracture process zone is identified and the true fracture energy is evaluated. The AE data is also employed for tracing the damage progression in plain and fibre reinforced concrete, using both parametric- and signal- based techniques. Hilbert - Huang transform (HHT) is used in signal based processing for evaluating instantaneous frequency of the acoustic events. It is found that the appropriately processed and carefully analyzed acoustic data is capable of providing vital information on progression of damage on different types of concrete.
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Kaiprath Jayadeep,V. V. Kishor Kumar 대한설비공학회 2023 International Journal of Air-Conditioning and Refr Vol.31 No.1
The average global temperature has increased by approximately 0.7 °C since the last century. If the current trend continues, the temperature may further increase by 1.4 – 4.5 °C until 2100. It is estimated that air-conditioning and refrigeration systems contribute about 15% of world electrical energy demand. The rapid depletion of non-renewable resources such as fossil fuels and the associated emissions lead to the development of alternative solutions which employ renewable energy resources for refrigeration. The conventional vapour compression (VC) and vapour absorption (or adsorption) (VA) refrigeration systems usually rely on fossil fuels for their operation which ultimately leads to large amount of CO 2 emissions. Thermoelectric (TE) refrigeration systems working on the principle of Peltier effect are an alternative for the conventional systems. The thermoelectric refrigerators will not produce any noise and vibration due to the absence of any moving parts. They are refrigerant-free as electrons act as heat carriers. The greatest advantage of a TE system is that it can directly be powered by solar photovoltaic (PVs) since they give a DC output. The main drawback of thermoelectric refrigeration system is their low coefficient of performance (COP). The COP of a thermoelectric cooler (TEC) operating with a temperature difference of 20 °C is about 0.5. The improvement of heat transfer at the hot side of the cooler is a key aspect for a better COP. A good thermoelectric material should possess high Seebeck coefficient, low-thermal conductivity, and high electrical conductivity. Since these three are interrelated, these parameters must be optimized. It is important to reduce the electric contact and thermal resistances and get an optimized configuration of thermoelectric cooler. The recent developments in material science has enabled the usage of better thermoelectric materials with a positive Thomson coefficient to produce a better cooling performance. The total efficiency of a TEC powered by solar cell is the product of PV system efficiency and the COP of the cooler. Therefore, the enhancement of PV system efficiency and the selection of materials with better thermoelectric performance are important in the design of solar-powered thermoelectric cooler. The performance of solar cell-powered TEC depends on solar insolation which varies with weather, climate, and geographic location. Due to the variation in insolation and unavailability of solar power in the night, a battery must be used to store the energy. This paper presents a comprehensive review about the thermoelectric coolers and the dependance of performance of TECs on various operating and design parameters. The results reported for the performance improvement of solar PV-powered thermoelectric coolers were critically analysed.
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