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Analysis of silicon-based integrated photovoltaic–electrochemical hydrogen generation system under varying temperature and illumination

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Journal of Energy Chemistry 2017年第1期26卷 72-80页

作者： Vishwa bhatt brijesh Tripathi Pankaj Yadav manoj kumar Department of Solar Energy School of TechnologyPandit Deendayal Petroleum UniversityGandhinagar 382007India Department of Science School of TechnologyPandit Deendayal Petroleum UniversityGandhinagar 382007India Department of Electrical Engineering Incheon National UniversityIncheon 406772Republic of Korea

Last decade witnessed tremendous research and development in the area of photo-electrolytic hydrogen generation using chemically stable nanostructured photo-cathode/anode materials. Due to intimately coupled charge separation and photo-catalytic processes, it is very difficult to optimize individual components of such system leading to a very low demonstrated solar-to-fuel efficiency (SFE) of less than 1%. Recently there has been growing interest in an integrated photovoltaic–electrochemical (PV–EC) system based on GaAs solar cells with the demonstrated SFE of 24.5% under concentrated illumination condition. but a high cost of GaAs based solar cells and recent price drop of poly-crystalline silicon (pc-Si) solar cells motivated researchers to explore silicon based integrated PV–EC system. In this paper a theoretical framework is introduced to model silicon-based integrated PV–EC device. The theoretical framework is used to analyze the coupling and kinetic losses of a silicon solar cell based integrated PV–EC water splitting system under varying temperature and illumination. The kinetic loss occurs in the range of 19.1%–27.9% and coupling loss takes place in the range of 5.45%–6.74% with respect to varying illumination in the range of 20–100 mW/cm2. Similarly, the effect of varying temperature has severe impact on the performance of the system, wherein the coupling loss occurs in the range of 0.84%–21.51% for the temperature variation from 25 to 50 °C. © 2016 Science Press

关键词： Electrochemical cells Electrochemical impedance spectroscopy Gallium arsenide Hydrogen production Nanostructured materials Polysilicon Semiconducting gallium Silicon Silicon solar cells Solar power generation

Analysis of Epimetamorphic Rock Slopes Using Soft Computing

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Journal of Shanghai Jiaotong university(Science) 2014年第3期19卷 274-278页

作者： kumar manoj SAMUI Pijush Scientist-I National Institute of Rock Mechanics Kolar Gold Fields 563 117Karnataka India Centre for Disaster Mitigation and Management Vellore Institute of Technology

This article adopts three soft computing techniques including support vector machine(SVM), least square support vector machine(LSSVM) and relevance vector machine(RVM) for prediction of status of epimetemorphic rock slope. The input variables of SVM, LSSVM and RVM are bulk density, height, inclination, cohesion and internal friction angle. There are 53 datasets which have been used to develop the SVM, LSSVM and RVM models. The developed SVM, LSSVM and RVM give equations for prediction of status of epimetemorphic rock slope. The performance of SVM, LSSVM and RVM is 100%. A comparative study has been presented between the developed SVM, LSSVM and RVM. The results confirm that the developed SVM, LSSVM and RVM are effective tools for prediction of status of epimetemorphic rock slope.

关键词： epimetemorphic rock slope probability support vector machine(SVM) least square support vector machine(LSSVM) relevance vector machine(RVM)

Digitally controlled oscillator design with a variable capacitance XOR gate

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Journal of Semiconductors 2011年第10期32卷 86-92页

作者： manoj kumar Sandeep K.Arya Sujata Pandey Department of Electronics and Communication Engineering Guru Jambheshwar University of Science and TechnologyHisarIndia Amity University NoidaIndia

A digitally controlled oscillator（DCO） using a three-transistor XOR gate as the variable load has been presented.A delay cell using an inverter and a three-transistor XOR gate as the variable capacitance is also proposed. Three-,five- and seven-stage DCO circuits have been designed using the proposed delay *** output frequency is controlled digitally with bits applied to the delay *** three-bit DCO shows output frequency and power consumption variation in the range of 3.2486-4.0267 GHz and 0.6121-0.3901 mW,respectively,with a change in the control word *** five-bit DCO achieves frequency and power of 1.8553-2.3506 GHz and 1.0202-0.6501 mW,respectively,with a change in the control word ***,the seven-bit DCO shows a frequency and power consumption variation of 1.3239-1.6817 GHz and 1.4282-0.9102 mW,respectively, with a varying control word *** power consumption and output frequency of the proposed circuits have been compared with earlier reported circuits and the present approaches show significant improvements.

关键词： digital control oscillator delay cell power consumption variable capacitance voltage controlled oscillators XOR gate

Cu（OTf）2 Catalyzed Synthesis of bis（5-methyl-2-furyl）methanes by Condensation of 2-Methylfuran with Carbonyl Compounds under Solvent Free Conditions

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Chinese Journal of Chemistry 2011年第7期29卷 1483-1488页

作者： Muthyala, manoj kumar Rao, V. Kameswara kumar, Anil Department of Chemistry Birla Institute of Technology and Science Pilani 333 031 India

A facile and efficient one-pot three-component synthesis of bis（5-methyl-2-furyl）methanes has been achieved via the reaction of 2-methylfuran with a series of aliphatic and aromatic aldehydes and aliphatic ketones in presence of copper（II） triflate under solvent free conditions. The bis（5-methyl-2-furyl）methanes were obtained in 34%--72% yields and the catalyst was recycled up to four successive cycles without much loss in catalytic activity.

关键词： Lewis acid copper(II) triflate 2-methylfuran bis(5-methyl-2-furyl)methane multicomponent condensation solvent free condition

Chemical and physical studies of metallic alloy-based old Indian coins with LIbS coupled with multivariate analysis

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Plasma Science and Technology 2023年第9期25卷 91-103页

作者： Vikas GUPTA Abhishekh kumar RAI Tejmani kumar Rajendhar JUNJURI G manoj kumar A K RAI Laser Spectroscopy Research Laboratory Department of PhysicsUniversity of AllahabadPrayagraj 211002India Department of Earth and Planetary Sciences University of AllahabadPrayagraj 211002India Advanced Centre of Research in High Energy Materials University of HyderabadHyderabad 500046 India Leibniz Institute of Photonic Technology Jena D-07745Germany

The present work aims to demonstrate the capabilities of Laser-induced breakdown Spectroscopy(LIbS)coupled with a multivariate technique for rapid quantification and classification of old Indian coins made of various *** old Indian coins in different years of circulation,(1922–1986)were selected for the *** concentrations were determined by Calibration free LIbS(CF-LIbS)*** concentration of cuprum(Cu)is negligible,and aluminum(Al)is maximum in the first five coins,and vice-versa in the remaining eight *** different multivariate methods,Principal Component Analysis(PCA)and Soft Independent Modelling of Class Analogy(SIMCA)have been used to classify and identify the *** classified all thirteen samples into four main alloy *** discernment of unknown samples to their probable class membership of alloy was performed using *** surface hardness(brinell hardness number)is linearly correlated with the plasma temperature and LIbS intensity *** sample surface of the first and fifth coin belongs to Al-alloy,having the least surface hardness,and it became harder for Cu–Ni alloy,Ni-brass alloy,and bronze *** hardness of the surface is more for bronze sample *** is also observed that the plasma temperature increases monotonically with the brinell hardness *** analysis provides valuable information on fabrication methodology and explains large diversification in the elementary composition of old coins.

关键词： LIbS metallic alloy stoichiometric ablation PCA SIMCA old indian coins surface hardness

Protected simultaneous quantum remote state preparation scheme by weak and reversal measurements in noisy environments

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Chinese Physics b 2024年第2期33卷 169-177页

作者： Mandal manoj kumar Choudhury binayak S. Samanta Soumen Department of Mathematics Indian Institute of Engineering Science and TechnologyShibpur B.GardenHowrah 711103West BengalIndia

We discuss a quantum remote state preparation protocol by which two parties, Alice and Candy, prepare a single-qubit and a two-qubit state, respectively, at the site of the receiver bob. The single-qubit state is known to Alice while the two-qubit state which is a non-maximally entangled bell state is known to Candy. The three parties are connected through a single entangled state which acts as a quantum channel. We first describe the protocol in the ideal case when the entangled channel under use is in a pure state. After that, we consider the effect of amplitude damping(AD) noise on the quantum channel and describe the protocol executed through the noisy channel. The decrement of the fidelity is shown to occur with the increment in the noise parameter. This is shown by numerical computation in specific examples of the states to be created. Finally, we show that it is possible to maintain the label of fidelity to some extent and hence to decrease the effect of noise by the application of weak and reversal measurements. We also present a scheme for the generation of the five-qubit entangled resource which we require as a quantum channel. The generation scheme is run on the IbMQ platform.

关键词： multi-qubit entangled channel quantum remote state preparation noisy environments weak and reversal measurements

Geochemistry and geochronology of A-type basement granitoids in the north-central Aravalli Craton: Implications on Paleoproterozoic geodynamics of NW Indian block

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Geoscience Frontiers 2021年第4期12卷 138-150页

作者： manoj K.Pandit Hitesh kumar WeiWang Department of Geology University of RajasthanJaipur 302004India Department of Mines and Geology Government of RajasthanJaipurRajasthanIndia State Key Laboratory of Geological Processes and Mineral Resources School of Earth Sciences and ResourcesChina University of GeosciencesWuhan 430074China

The basement granite gneisses from the north-central Aravalli Craton in NW India were investigated for geochemistry and *** a peneplain terrain,the granite gneiss outcrops are scanty and samples were collected mainly from two small hills and several ground-level exposures in the Sakhun–Ladera *** granite gneiss is the dominant lithology that also hosts dark,lenticular enclaves,and is in turn,intruded by mafic *** granite gneiss has silica content ranging from 61.37 wt.%to 68.27 wt.%that marks a slight overlap with the enclaves(54.32wt.%to 62.17wt.%).both groups have a highK2O/Na2O(~2 or higher)***,the granite gneiss classify as granite–granodiorite,and enclaves as *** In-situ LA-ICP-MS zircon U–Pb geochronology of granite gneiss has yielded a statistically valid 1721±9 Ma age that we interpret as the emplacement age for the granitic *** characteristics of granite gneiss underline fractional crystallization of an I-type melt as themain process,and continuity of trends in enclaves underlines their mutual genetic *** genetic association is further verified by a consistency in the trace element characteristics and REE *** Nd-isotope signatures define a single grouping for both granite gneiss and enclaves,withεNd(t)values ranging from−6.38 to−6.61,further substantiating a common *** geochemical tectonic discrimination schemes consistently point toward an extensional setting and A-type characteristics for granite gneiss and *** are analogous to the coeval(1.72–1.75 Ga),A-type granitoids from the Khetri and Alwar basin in the North Delhi Fold belt,implying a much larger areal extent for the Paleoproterozoic anorogenic magmatism in the northern segment of the Aravalli *** Paleoproterozoic age for the presumed‘Archean’basement in this region offers tacit evidence that the bGC–II is a stratigraphically younger terrane as compared to the Archean age,

关键词： basement granite Geochemistry Zircon U–Pb geochronology A-type granites Aravalli Craton NWIndian block

Numerical solution of micropolar fluid flow via stretchable surface with chemical reaction and melting heat transfer using Keller-box method

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Propulsion and Power Research 2021年第2期10卷 194-207页

作者： Khilap Singh Alok kumar Pandey manoj kumar Department of Mathematics Statistics and Computer ScienceG.B.Pant University of Agriculture and TechnologyPantnagarUttarakhand263145India Department of Mathematics Graphic Era Deemed to be UniversityDehradunUttarakhand248002India

The main theme of this research is to find the numerical results of stagnation point flow of micropolar fluid over a porous stretchable surface due to the physical effects of internal heat generation/absorption,melting heat transfer and chemical reaction via Keller-box method(KbM).The graphs and tables are depicted and explained for various embedded *** range of melting heat transfer parameter is 0≤M≤3,the range of chemical reaction parameter is 0≤K_(r)≤1 whereas the values of space-temperature dependent heat source/sink parameters lies in-0:4≤Q≤0:4 and-2≤Q*≤*** upshots of the current problem illustrate that at fluid-solid interface,rate of HMT(heat and mass transfer)declined on escalating the values of stretching ***,as the values of internal heat source/sink parameter increases,heat transfer rate declines at fluid-solid interface.

关键词： Chemical reaction Implicit finite difference Keller-box method(KbM) Internal heat generation/absorption Heat and mass transfer(HMT) Melting heat transfer Porous medium

Slip flow of micropolar fluid through a permeable wedge due to the effects of chemical reaction and heat source/sink with Hall and ionslip currents:an analytic approach

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Propulsion and Power Research 2020年第3期9卷 289-303页

作者： Khilap Singh Alok kumar Pandey manoj kumar Department of Mathematics Statisticsand Computer ScienceG.B.Pant University of Agriculture and TechnologyPantnagar263145UttarakhandIndia Department of Mathematics Graphic Era Deemed to Be UniversityDehradun248002UttarakhandIndia

This study focuses on the combined impact of heat source/sink and chemical reaction on slip flow of micropolar fluid through a permeable wedge in the existence of Hall and ion-slip *** governing highly non-lincar PDEs were altered into a set of non-linear coupled ODEs by using similarity *** transformation method(DTM)has been implemented in transformed ODEs *** comparison with previous literatures was performed and the data of this study was found to be in accordance with each *** analytical solutions for skin-friction coefficients(surface drag forces),Nussclt and Sherwood numbers are depicted through graphs and *** study of boundary layer flow over a wedge surface plays an imperative role in the field of aerodynamics,heat exchanger,ground water pollution and geothermal system etc.

关键词： Chemical reaction Differential transformation method(DTM) Hall current and ion slip Heat source/sink Micropolar fluid Slip velocity