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Applied Mathematics and Mechanics(English Edition) 2010年第2期31卷 159-173页

作者： bikash sahoo Department of Mathematics National Institute of Technology

The flow and heat transfer of an electrically conducting non-Newtonian second grade fluid due to a radially stretching surface with partial slip is considered. The partial slip is controlled by a dimensionless slip factor, which varies between zero （total adhesion） and infinity （full slip）. Suitable similarity transformations are used to reduce the resulting highly nonlinear partial differential equations into ordinary differential equations. The issue of paucity of boundary conditions is addressed and an effective numerical scheme is adopted to solve the obtained differential equations even without augmenting any extra boundary conditions. The important findings in this communication are the combined effects of the partial slip, magnetic interaction parameter and the second grade fluid parameter on the velocity and temperature fields. It is interesting to find that the slip increases the momentum and thermal boundary layer thickness. As the slip increases in magnitude, permitting more fluid to slip past the sheet, the skin friction coefficient decreases in magnitude and approaches zero for higher values of the slip parameter, i.e., the fluid behaves as though it were inviscid. The presence of a magnetic field has also substantial effects on velocity and temperature fields.

关键词： second grade fluid stretching sheet partial slip heat transfer finitedifference method Broyden's method

Existence and uniqueness theorem for flow and heat transfer of a non-Newtonian fluid over a stretching sheet

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第5期8卷 766-771页

作者： sahoo bikash SHARMA H.G. Department of Mathematics Indian Institute of Technology RoorkeeUttaranchal 247667India

Analysis is carried out to study the existence, uniqueness and behavior of exact solutions of the fourth order nonlinear coupled ordinary differential equations arising in the flow and heat transfer of a viscoelastic, electrically conducting fluid past a continuously stretching sheet. The ranges of the parametric values are obtained for which the system has a unique pair of solutions, a double pair of solutions and infinitely many solutions.

关键词： Viscoelastic fluid Stretching sheet MHD flow Heat transfer Nonlinear systems Existence Uniqueness

MHD flow and heat transfer from continuous surface in uniform free stream of non-Newtonian fluid

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Applied Mathematics and Mechanics(English Edition) 2007年第11期28卷 1467-1477页

作者： bikash sahoo H.G Sharma Department of Mathematics Indian Institute of Technology RoorkeeRoorkeeUttarakhand-247667India

An analysis is carried out to study the steady flow and heat transfer characteristics from a continuous flat surface moving in a parallel free stream of an electrically conducting non-Newtonian viscoelastic fluid. The flow is subjected to a transverse uniform magnetic field. The constitutive equation of the fluid is modeled by that for a second grade fluid. Numerical results are obtained for the distribution of velocity and temperature profiles. The effects of various physical parameters like viscoelastic parameter, magnetic parameter and Prandtl number on various momentum and heat transfer characteristics are discussed in detail and shown graphically.

关键词： second grade fluid free stream heat transfer magnetic field finite difference method

Thornthwaite moisture index and depth of suction change under current and future climate‒An Australian study

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第5期16卷 1761-1775页

作者： Md Rajibul Karim bikash Devkota Md Mizanur Rahman Hoang Bao Khoi Nguyen UniSA STEM University of South AustraliaMawson Lakes CampusMawson LakesSouth Australia5095Australia

Climate change is one of the major global challenges and it can have a significant influence on the behaviour and resilience of geotechnical *** changes in moisture content in soil lead to effective stress changes and can be accompanied by significant volume changes in reactive/expansive *** volume change leads to ground movement and can exert additional stresses on structures founded on or within a shallow depth of such *** change is likely to amplify the ground movement potential and the associated problems are likely to *** effect of atmospheric boundary interaction on soil behaviour has often been correlated to Thornthwaite moisture index(TMI).In this study,the long-term weather data and anticipated future projections for various emission scenarios were used to generate a series of TMI maps for *** changes in TMI were then correlated to the depth of suction change(H s),an important input in ground movement *** all climate scenarios considered,reductions in TMI and increases in H s values were observed.A hypothetical design scenario of a footing on expansive soil under current and future climate is *** is observed that a design that might be considered adequate under the current climate scenario,may fail under future scenarios and accommodations should be made in the design for such events.

关键词： Climate change Future prediction Thornthwaite moisture index(TMI) Characteristic surface movement Infrastructure resilience

Spectral Characteristic Based on Fabry–Pérot Laser Diode with Two-Stage Optical Feedback

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Chinese Physics Letters 2013年第1期30卷 87-90页

作者： WU Jian-Wei bikash NAKARMI Chongqing Key Laboratory of Optoelectronic Functional Material Chongqing Normal UniversityChongqing 400047 State Key Laboratory of Millimeter Waves Nanjing 210096 College of Science Hohai UniversityNanjing 210098 Department of Information and Communication engineering Korea Advanced Institute of Science and TechnologyDaejeon 305-714R.Korea

An optical device,consisting of a multi-mode Fabry–Pérot laser diode(MMFP-LD)with two-stage optical feedback,is proposed and experimentally *** results show that the single-mode output with side-mode suppression ratio(SMSR)of~21.7 dB is attained by using the first-stage *** using the second-stage feedback,the SMSR of single-mode operation could be increased to~28.5 dB while injection feedback power of-29 dBm is introduced into the laser *** the case of up to-29 dBm feedback power,the outcome SMSR is rapidly decayed to a very low level so that an obvious multi-mode operation in the output spectrum could be achieved at the feedback power level of-15.5 ***,a transition between single-and multi-mode operations could be flexibly controlled by adjusting the injected power in the second-stage feedback ***,in the case of injection locking,the outcome SMSR and output power at the locked wavelength are as high as~50 dB and~5.8 dBm,respectively.

关键词： SMS mode injection

Transition metal-based single-atom catalysts(TM-SACs);rising materials for electrochemical CO_(2) reduction

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Journal of Energy Chemistry 2022年第7期31卷 444-471,I0012页

作者： Bishnupad Mohanty Suddhasatwa Basu bikash Kumar Jena Materials Chemistry Department CSIR-Institute of Minerals and Materials TechnologyBhubaneswar 751013India Academy of Scientific&Innovative Research(AcSIR) Ghaziabad 201002India

The continuous increase of global atmospheric CO_(2) concentrations brutally damages our environment. A series of methods have been developed to convert CO_(2) to valuable fuels and value-added chemicals to maintain the equilibrium of carbon cycles. The electrochemical CO_(2) reduction reaction(CO_(2)RR) is one of the promising methods to produce fuels and chemicals, and it could offer sustainable paths to decrease carbon intensity and support renewable energy. Thus, significant research efforts and highly efficient catalysts are essential for converting CO_(2) into other valuable chemicals and fuels. Transition metal-based single atoms catalysts(TM-SACs) have recently received much attention and offer outstanding electrochemical applications with high activity and selectivity opportunities. By taking advantage of both heterogeneous and homogeneous catalysts, TM-SACs are the new rising star for electrochemical conversion of CO_(2) to the value-added product with high selectivity. In recent years, enormous research effort has been made to synthesize different TM-SACs with different M–Nxsites and study the electrochemical conversion of CO_(2) to CO. This review has discussed the development and characterization of different TMSACs with various catalytic sites, fundamental understanding of the electrochemical process in CO_(2) RR,intrinsic catalytic activity, and molecular strategics of SACs responsible for CO_(2)RR. Furthermore, we extensively review previous studies on 1 st-row transition metals TM-SACs(Ni, Co, Fe, Cu, Zn, Sn) and dual-atom catalysts(DACs) utilized for electrochemical CO_(2) conversions and highlight the opportunities and challenges.

关键词： CO_(2)RR Single-atom catalyst SACs Dual-atom catalyst DACs Transition metals Support catalysts

A power and wavelength detuning-dependent hysteresis loop in a single mode Fabry-Prot laser diode

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Chinese Physics B 2013年第8期22卷 434-438页

作者：吴建伟 bikash Nakarmi Chongqing Key Laboratory of Optoelectronic Functional Material Chongqing Normal University State Key Laboratory of Millimeter Waves Department of Electrical Engineering Korea Advanced Institute of Science and Technology Department of Information and Communication Engineering Korea Advanced Institute of Science and Technology

In this paper, we observe experimentally the optical bistability induced by the side-mode injection power and wave- length detuning in a single mode Fabry-P6rot laser diode （SMFP-LD）. Results show that the bistability characteristics of the dominant and injected modes are strongly dependent on the injected input optical power and wavelength detuning in an SMFP-LD. We observe three types of hysteresis loops： counterclockwise, clockwise, and butterfly hysteresis with various loop widths. In the case of a bistability loop caused by injection power, the transition from counterclockwise to clockwise in the hysteresis direction with the wavelength detuning from 0.028 nm to 0.112 nm is observed in a way of butterfly hys- teresis for the dominant mode by increasing the wavelength detuning. The width of hysteresis loop, induced by wavelength detuning is also changed while the injection power is enhanced from -7 dBm to -5 dBm.

关键词： single mode Fabry-P6rot laser diode injection locking behavior optical bistability

Effects of operating pressure on the key parameters of coal direct chemical looping combustion

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International Journal of Coal Science & Technology 2016年第1期3卷 20-27页

作者： Rahul Wadhwani bikash Mohanty Department of Chemical Engineering Indian Institute ofTechnology Roorkee Roorkee India

Techno-economic development of chemical looping combustion （CLC） process has been one of the most pursued research areas of the present decade due to its ability to reduce carbon foot print during utilization of coal to generate energy. Based on a 2D computational fluid dynamics model, the present work provides a computational approach to study the effect of operating pressure--a key parameter in designing of CLC reactors, on optimum operating conditions. The effects of operating pressure have been examined in terms of reactors temperature, percentage of fuel conversion and purity of carbon dioxide in fuel reactor exhaust. The simulated results show qualitative agreement with the trends obtained by other investigators during experimental studies.

关键词： Operating pressure Chemical looping combustion Computational fluid dynamics (CFD)

Tectonic control on the drainage system in a piedmont region in tectonically active eastern Himalayas

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Frontiers of Earth Science 2012年第1期6卷 29-38页

作者： Chandreyee GOSWAMI Dhruba MUKHOPADHYAY bikash Chandra PODDAR Asutosh College Saltlake CityKolkata 700026India Raman Center for Applied and Interdisciplinary Sciences Saltlake CityKolkata 700075India BE 267 Saltlake CityKolkata 700064India

The impact ofneotectonic activity on drainage system has been studied in a large alluvial fan in the eastern Himalayan piedmont area between the Mal River and the Murti River. Two distinct E-W lineaments passing through this area had been identified by Nakata （1972, 1989） as active faults. The northern lineament manifested as Matiali scarp and the southern one manifested as Chalsa scarp represent the ramp anticlines over two blind faults, probably the Main Boundary Thrust （MBT） and the Himalayan Frontal Thrust （HFT）, respectively. The fan surface is folded into two antiforms with a synform in between. These folds are interpreted as fault propagation folds over the two north dipping blind thrusts. Two lineaments trending NNE-SSW and nearly N-S, respec- tively, are identified, and parts of present day courses of the Murti and Neora Rivers follow them. These lineaments are named as Murti and Neora lineaments and are interpreted to represent a conjugate set of normal faults. The rivers have changed their courses by the influence of these normal faults along the Murti and Neora lineaments and their profiles show knick points where they cross E-W thrusts. The overall drainage pattern is changed from radial pattern in north of the Matiali scarp to a subparallel one in south due to these conjugate normal faults. The interfluve area between these two rivers is uplifted as a result of vertical movements on the above mentioned faults. Four major terraces and some minor terraces are present along the major river valleys and these are formed due to episodic upliftment of the ground and subsequent down- cutting of the rivers. The uppermost terrace shows a northerly slope north of the Chalsa scarp as a result of folding mentioned above. But rivers on this terrace form incised channels keeping their flow southerly suggestingthat they are antecedent to the folding and their downcutting kept pace with the tectonism.

关键词： alluvial fan drainage pattern thrust normalfault active tectonic

Production of whey protein hydrolyzates and its incorporation into milk

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Food Production, Processing and Nutrition 2021年第1期3卷 163-175页

作者： Jenny Ann John bikash CGhosh Dairy Technology Division ICAR-National Dairy Research InstituteAdugodiBengaluru 560030India Department of Food Science and Technology SOSTKerala University of Fisheries and Ocean Studies(KUFOS)Panangad P.O.Kochi 682506India

Whey proteins provide an excellent source of low-molecular-weight bioactive peptides with important functional properties and bioactivities like antihypertensive,opioid,and antimicrobial *** of peptide molecules with lower molecular weight has a great role in food for health *** this investigation,the release of low-molecular-weight peptides from whey protein concentrate was attempted by using enzymatic *** hydrolyzate was then incorporated into milk to obtain enriched milk(EM)with low-molecular-weight *** on sensory analysis of EM,electrophoretic and RP-HPLC studies,hydrolyzates of 10%protein(degree of hydrolysis 5%;enzyme/substrate E/S,1:50)were finally incorporated into milk at 20%(v/v)to develop an acceptable product enriched with low-molecular-weight *** had higher protein content,viscosity and emulsifying properties than control milk with 3%*** is recommended that EM should not be sterilized as it results in coagulation,but can be safely pasteurized and spray dried without any undesirable *** ACE-inhibition activity was obtained in hydrolyzate,followed by *** study is expected to boost the opportunity for the dairy industry to venture further into the nutraceutical dairy market.

关键词： Whey protein hydrolyzate Enriched milk Electrophoresis ACE inhibition activity