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A Novel Multi-agent Formation Control Law With Collision Avoidance

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IEEE/CAA Journal of Automatica Sinica 2017年第3期4卷 558-568页

作者： Arindam Mondal Laxmidhar Behera Soumya Ranjan sahoo Anupam Shukla Department of Electrical Engineering Indian Institute of Technology IEEE ABV-Indian Institute of Information technology & Management

In this paper a stable formation control law that simultaneously ensures collision avoidance has been *** is assumed that the communication graph is undirected and *** proposed formation control law is a combination of the consensus term and the collision avoidance term(CAt).the first order consensus term is derived for the proposed model,while ensuring the Lyapunov *** consensus term creates and maintains the desired formation shape,while the CAt avoids the *** the collision avoidance,the potential function based CAt makes the agents repel from each *** unrestricted repelling magnitude cannot ensure the graph connectivity at the time of collision *** we have proposed a formation control law,which ensures this connectivity even during the collision *** is achieved by the proposed novel adaptive potential *** potential function adapts itself,with the online tuning of the critical variable associated with *** tuning has been done based on the lower bound of the critical variable,which is derived from the proposed connectivity *** efficacy of the proposed scheme has been validated using simulations done based on formations of six and thirty-two agents respectively.

关键词： Consensus collision avoidance formation control graph theory stability

Oblique Wave trapping by Vertical Permeable Membrane Barriers Located near a Wall

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Journal of Marine Science and Application 2017年第4期16卷 490-501页

作者： Santanu Koley trilochan sahoo Dhirubhai Ambani Institute of Information and Communication technology Gandhinagar - 382007 India Department of Ocean Engineering and Naval Architecture Indian Institute of Technology Kharagpur - 721302 India

the effectiveness of a vertical partial flexible porous membrane wave barrier located near a rigid vertical impermeable seawall for trapping obliquely incident surface gravity waves are analyzed in water of uniform depth under the assumption of linear water wave theory and small amplitude membrane barrier response. From the general formulation of the submerged membrane barrier, results for bottom-standing and surface-piercing barriers are computed and analyzed in special cases. Using the eigenfunction expansion method, the boundary-value problems are converted into series relations and then the required unknowns are obtained using the least squares approximation method. Various physical quantities of interests like reflection coefficient, wave energy dissipation, wave forces acting on the membrane barrier and the seawall are computed and analyzed for different values of the wave and structural parameters. the study will be useful in the design of the membrane wave barrier for the creation of tranquility zone in the lee side of the barrier to protect the seawall.

关键词： surface waves flexible membrane porosity eigenfunction expansion least squares approximation

Cowpea NAC1/NAC2 transcription factors improve growth and tolerance to drought and heat in transgenic cowpea through combined activation of photosynthetic and antioxidant mechanisms

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Journal of Integrative Plant Biology 2023年第1期65卷 25-44页

作者： Richa Srivastava Yuriko Kobayashi Hiroyuki Koyama Lingaraj sahoo Department of Biosciences and Bioengineering Indian Institute of technology Guwahati Guwahati Assam 781039 India Faculty of Applied Biological Sciences Gifu University 1-1 YanagidoGifu 501-1193Japan

NAC(NAM/AtAF1/2/CUC2)transcription factors are central switches of growth and stress responses in ***,unpredictable interspecies conservation of function and regulatory targets makes the well-studied NAC orthologs inapt for pulse *** knowledge of suitable NAC candidates in hardy pulses like cowpea(Vigna unguiculata(L.)Walp.)is still in infancy,hence warrants immediate biotechnological ***,we showed that overexpression of two native NAC genes(VuNAC1and VuNAC2)promoted germinative,vegetative,and reproductive growth and conferred multiple abiotic stress tolerance in a commercial cowpea *** transgenic lines displayed increased leaf area,thicker stem,nodule-rich denser root system,early flowering,higher pod production(~3.2-fold and~2.1-fold),and greater seed weight(10.3%and 6.0%).In contrast,transient suppression of VuNAC1/2 caused severe growth retardation and flower *** overexpressor lines showed remarkable tolerance to major yielddeclining terminal stresses,such as drought,salinity,heat,and cold,and recovered growth and seed production by boosting photosynthetic activity,water use efficiency,membrane integrity,Na^(+)/K^(+)homeostasis,and antioxidant *** comparative transcriptome study indicated consolidated activation of genes involved in chloroplast development,photosynthetic complexes,cell division and expansion,cell wall biogenesis,nutrient uptake and metabolism,stress response,abscisic acid,and auxin *** their orthologs,VuNAC1/2 direct synergistic transcriptional tuning of stress and developmental signaling to avoid unwanted *** overexpression governs the favorable interplay of photosynthesis and reactive oxygen species regulation to improve stress recovery,nutritional sufficiency,biomass,and *** unconventional balance of strong stress tolerance and agronomic quality is useful for translational crop research and molecular breeding of pulses.

关键词： cowpea enhanced photosynthetic activity improved growth improved yield legume genetic engineering multiple stress tolerance NAC transcription factor VuNAC

Non-exotic static spherically symmetric thin-shell wormhole solution in f(Q,t)gravity

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Chinese Physics C 2023年第7期47卷 173-189页

作者： Moreshwar tayde Sayantan Ghosh P.K.sahoo Department of Mathematics Birla Institute of Technology and Science-PilaniHyderabad CampusHyderabad-500078India

In this study,we conduct an analysis of traversable wormhole solutions within the framework of linear f(Q,t)=αQ+βt gravity,ensuring that all energy conditions hold for the entire *** solutions presented in this paper are derived through a comprehensive analytical examination of the parameter space associated with the wormhole *** involves considering the exponents governing the redshift and shape functions,as well as the radius of the wormhole throat(r_(0)),the redshift function value at the throat(∅_(0)),and the model parameters(αandβ).Moreover,we establish bounds on these free parameters,which guarantee the satisfaction of the energy conditions throughout spacetime and also provide two ***,we use the Israel junction condition to observe the stability of a thin-shell around the ***,we calculate the null energy condition criteria as well as the potential for the thin-shell and how it varies with the chosen shape function.

关键词： wormhole energy conditions f(Q,t)gravity junction condition thin-shell

Long-term effects of metformin use in gestational diabetes mellitus on offspring health

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World Journal of Diabetes 2021年第11期12卷 1812-1817页

作者： Ayan Roy Jayaprakash sahoo Department of Endocrinology and Metabolism All India Institute of Medical SciencesJodhpur 342005RajasthanIndia Department of Endocrinology Jawaharlal Institute of Postgraduate Medical Education and ResearchPuducherry 605006India

Metformin is the first-line drug for the treatment of type 2 diabetes mellitus,but its role in gestational diabetes mellitus(GDM)management is not *** evidence suggests a certain beneficial effect of metformin in the treatment of GDM,but a high treatment failure rate leads to the initiation of additional medications,such as ***,since metformin crosses the placental barrier and reaches a significant level in the fetus,it is likely to influence the fetal metabolic *** evidence indicates the long-term safety in children exposed to metformin in utero except for mild adverse anthropometric *** follow-up of metformin-exposed offspring is warranted from the clinician’s point of view.

关键词： Anthropometry Fetal Gestational diabetes mellitus Long-term Metformin Offspring

Kinetics of solid-state reduction of chromite overburden

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International Journal of Minerals,Metallurgy and Materials 2023年第12期30卷 2347-2355页

作者： Saida Shaik Zhiyuan Chen Preeti Prakash sahoo Chenna Rao Borra Metallurgical and Materials Engineering Department Indian Institute of Technology KharagpurKharagpurWest Bengal 721302India VItO-Flemish Institute for technological Research Boeretang 200B-2400 MolBelgium Research and Development Division Tata Steel Ltd.Jamshedpur 831001India

the demand for alternative low-grade iron ores is on the rise due to the rapid depletion of high-grade natural iron ore resources and the increased need for steel usage in daily ***,the use of low-grade iron ores is a constant clinical task for industry *** smelting of low-grade ores consumes a substantial amount of energy due to the large volume of slag *** condition can be avoided by direct reduction followed by magnetic separation(to separate the high amount of gangue or refractory and metal parts)and *** overburden(COB)is a mine waste generated in chromite ore processing,and it mainly consists of iron,chromium,and nickel(t%).In the present work,the isothermal and non-isothermal kinetics of the solid-state reduction of self-reduced pellets prepared using low-grade iron ore(COB)were thoroughly investigated via thermal *** results showed that the reduction of pellets followed a firstorder autocatalytic reaction control mechanism in the temperature range of 900-1100℃.the autocatalytic nature of the reduction reaction was due to the presence of nickel in the *** apparent activation energy obtained from the kinetics results showed that the solid-state reactions between COB and carbon were the rate-determining step in iron oxide reduction.

关键词： chromite overburden solid-state reduction kinetics autocatalytic reaction

Corrosion behavior of AZ31-WC nano-composites

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Journal of Magnesium and Alloys 2019年第4期7卷 681-695页

作者： Sudip Banerjee Suswagata Poria Goutam Sutradhar Prasanta sahoo Department of Mechanical Engineering Jadavpur UniversityKolkata 700032India Department of Mechanical Engineering Heritage Institute of TechnologyKolkata 700107India National Institute of technology Manipur LangolImphal 795004ManipurIndia

In this study,the effects of WC nano-particles amount and surface roughness on corrosion behavior of magnesium metal matrix nanocomposites in 3.5%NaCl solution are examined with the help of electrochemical *** wt%of WC nano-particles(0.5,1,1.5 and 2)are used to fabricate metal matrix nano-composites through ultrasonic vibration assisted stir casting *** characterizations of fabricated composites are performed by using scanning electron microscopy(SEM)and energy dispersive x-ray analysis(EDAX).SEM images show that nano-particles are well distributed throughout the magnesium matrix while EDAX results confirm the presence of WC particles in ***-hardness result shows increasing trend with increasing weight percentage of *** nano-composite containing 0.5 wt%WC nano-particles is found to be the most corrosion resistive one followed by base alloy,Mg-2 wt%WC,Mg-1.5 wt%WC and Mg-1 wt%***,corrosion behavior of Mg-2WC with different surface quality is examined and it is observed that sample with lowest surface roughness shows better corrosion *** the end,corrosion mechanisms are assessed with the help of SEM and EDAX study of corroded surfaces.

关键词： Mg-WC Nano-composite Corrosion Roughness Electrochemical test

transport mechanism in chemically reactive hybrid nanofluid flow containing gyrotactic micro-organisms over a curved oscillatory surface

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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 177-192页

作者： M.NAVEED M.IMRAN t.ASGHAR Z.ABBAS Department of Mathematics Division of Science and TechnologyUniversity of Education Department of Mathematics The Islamia University of Bahawalpur

this paper examines the transport analysis, including both heat transfer and mass transfer, in hybrid nanofluid flow containing gyrotactic microorganisms towards a curved oscillatory surface. the influence of magnetic fields is also inspected in terms of their physical characteristics. to depict the phenomena of transport, modified versions of both Fick's and Fourier's laws are used. Additionally, the characteristics of both heterogeneous and homogeneous chemical reactions are also incorporated. Utilizing a curvilinear coordinate system, the flow problem is formulated as partial differential equations(PDEs)for momentum, concentration, microorganism field, and energy. An analytical solution to the obtained flow equations is achieved utilizing the homotopy analysis method(HAM).the effects of significant flow parameters on the pressure and microorganism fields, velocity, oscillation velocity, concentration, and temperature distributions are shown via graphs. Furthermore, the variations in skin friction, mass transfer rate, heat transfer rate, and local motile number due to different involved parameters are presented in tables and are analyzed in detail. Graphical results indicate that the curves of velocity and temperature fields are enhanced as the values of the solid volume fraction variables *** is also verified that the concentration rate field decreases as the values of the homogeneous reaction strength parameter and the radius of curvature parameter increase, and it increases with the Schmidt number and the heterogeneous reaction strength *** outcomes show a favorable response of the motile number to advanced values of the Peclet number, the Schmidt number, the microorganism difference parameter, and the bio-convective Lewis number.

关键词： hybrid nanofluid oscillating curved stretchable sheet gyrotactic microorganism Cattaneo-Christov heat and mass flux chemical reaction analytical solution O368

Comparison between two tritrophic food chain models with multiple delays and anti-predation effect

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International Journal of Biomathematics 2021年第3期14卷 53-100页

作者： Debgopal sahoo G.P.Samanta Department of Mathematics Indian Institute of Engineering Science and technology Shibpur Howrah-711103India

Exploring the predator prey linkage in food chain system is the most familiar research work in population ***,some research experiments show that predator-prey interaction not only governed by direct hunting but also influenced by some indirect effect such as fear effect(felt by prey)that may change the physiological behavior of *** upon this fact,we consider a tritrophic food chain model incorporating with anti-predation response(fear effect)and multiple time delays for biomass conversion from prey to middle predator and middle to top *** analyze the resulting delay differential equations and explore how the anti-predation response level affects the population *** also investigate the effect of delay parameters,for which the model system switches its stability through *** compare all of our results between two different food chain models consisting of two different functional *** numerical simulations are performed to validate the effectiveness of the derived theoretical results.

关键词： Food chain functional response anti-predation response digestion delay Hopf-bifurcation