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Frontiers of Structural and Civil Engineering 2021年第6期15卷 1494-1503页

作者： Shuvankar DAS Debarghya chakraborty Department of Civil Engineering Indian Institute of Technology KharagpurKharagpur 721302India

The problem related to bearing capacity of footing either on pure soil or on pure rock mass has been investigated over the ***,no study deals with the bearing capacity of strip footing on a cohesive soil layer overlying rock ***,by implementing the lower bound finite element limit analysis in conjunction with the second-order cone programming and the power cone programming,the ultimate bearing capacity of a strip footing located on a cohesive soil overlying rock mass is determined in this *** considering the different values of interface adhesion factor(α_(cr))between the cohesive soil and rock mass,the ultimate bearing capacity of strip footing is expressed in terms of influence factor(I _(f))for different values of cohesive soil layer cover ratio(T_(cs)/B).The failure of cohesive soil is modeled by using Mohr−Coulomb yield criterion,whereas Generalized Hoek−Brown yield criterion is utilized to model the rock mass at *** variations of I_(f) with different magnitudes of α_(cr) are studied by considering the influence of the rock mass strength parameters of beneath rock mass *** examine stress distribution at different depths,failure patterns are also plotted.

关键词： bearing capacity soil-rock interface Hoek−Brown yield criterion plasticity limit analysis

Seismic fragility analysis of bridges by relevance vector machine based demand prediction model

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Earthquake Engineering and Engineering Vibration 2022年第1期21卷 253-268页

作者： Swarup Ghosh Subrata chakraborty Department of Civil Engineering Indian Institute of Engineering Science and TechnologyShibpurHowrah 711103India

A relevance vector machine(RVM)based demand prediction model is explored for efficient seismic fragility analysis(SFA)of a bridge *** proposed RVM model integrates both record-to-record variations of ground motions and uncertainties of parameters characterizing the bridge *** efficient fragility computation,ground motion intensity is included as an added dimension to the demand prediction *** incorporate different sources of uncertainty,random realizations of different structural parameters are generated using Latin hypercube sampling *** fragility,along with its dispersions,is estimated based on the log-normal fragility model for different critical components of a *** effectiveness of the proposed RVM model-based SFA of a bridge structure is elucidated numerically by comparing it with fragility results obtained by the commonly used SFA approaches,while considering the most accurate direct Monte Carlo simulation-based fragility estimates as the *** proposed RVM model provides a more accurate estimate of fragility than conventional approaches,with significantly less computational *** addition,the proposed model provides a measure of uncertainty in fragility estimates by constructing confidence intervals for the fragility curves.

关键词： bridge structure seismic fragility analysis seismic demand model relevance vector machine

A language for easy and efficient modeling of Turing machines

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Progress in Natural Science:Materials International 2007年第7期17卷 867-871页

作者： Pinaki chakraborty India New Delhi 110067 School of Computer and Systems Sciences Jawaharlal Nehru University

A Turing Machine Description Language(TMDL)is developed for easy and efficient modeling of Turing machines. TMDL supports formal symbolic representation of Turing *** grammar for the language is also *** a fast single- pass compiler is developed for *** scope of code optimization in the compiler is *** interpreter is used to simulate the exact behavior of the compiled Turing machines.A dynamically allocated and resizable array is used to simulate the infinite tape of a Turing *** procedure for simulating composite Turing machines is also *** this paper,two sample Turing machines have been designed in TMDL and their simulations are *** TMDL can be extended to model the different variations of the standard Tur- ing machine.

关键词： Turing machine compiler interpreter simulation

Tuning Energy Transfer in Metal-OrganicFrameworks for Fluorescence Turn-on Sensing of Hg(Ⅱ)Ions

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Chinese Journal of Chemistry 2023年第9期41卷 1051-1056页

作者： Xuejiao Wang arindam Mal Bo Gui Cheng Wang Sauvage Center for Molecular Sciences and Hubei Key Lab on Organic and Polymeric Optoelectronic Materials College of Chemistry and Molecular SciencesWuhan UniversityWuhanHubei 430072China

Tuning F?rster resonance energy transfer(FRET)in metal-organic frameworks for fluorescence turn on sensing is rarely ***,we designed and synthesized several FRET-based metal-organic frameworks(MOFs)with different donor/acceptor *** the oxidation of the acceptor,the FRET process in MOFs can be efficiently modulated so as to turn-on the fluorescence of the framework in a controlled ***,the MOF with an optimized donor/acceptor ratio of 7.0 was used as an efficient fluorescence turn on sensor for Hg(Ⅱ)ions with good sensitivity and *** believe our present study will not only give a useful method to construct fluorescence turn-on sensors but also trigger the construction of novel FRET-based MOFs for the fluo-rescence turn-on sensing of target analytes in the future.

关键词： Energy transfer FluorescenceHg(Ⅱ)ions Sensors Metal-organic frameworks

Influence of scattering of SH-waves in dynamic interaction of shear wall with soil layers

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Earthquake Engineering and Engineering Vibration 2020年第3期19卷 583-595页

作者： Shashi Kumar Swapan Kumar chakraborty Department of Mathematics Sarala Birla UniversityRanchi 835103India Department of Applied Mathematics Cambridge Institute of TechnologyRanchi 835103India Department of Mathematics Birla Institute of TechnologyMesraRanchi 835215India

The dynamic soil-structure interaction of a shear wall embedded in elastic isotropic and homogeneous soil layers underlain by bedrock,subjected to SH waves,is modeled in the present *** soil layers consist of irregular interfaces and it has been shown that the scattering due to the roughness of the layers has significant effect on the displacement of both the foundation and the shear *** demonstrate the phenomena indirect boundary element method(IBEM)has been used on the basis of its validation in previous problems of similar *** system response is compared with the analytical solution of the same type of model for vertically propagating incident SH *** is observed that for the low frequency of wave,displacement is abruptly high,and as a result the combination of shear wall and foundation perceives *** thickness of the soil layer,mass of the shear wall,stiffness of the bedrock and the soil layers all affects the system frequency and displacement.

关键词： soil dynamic interaction

Effect of eccentric and inclined loading on the bearing capacity of strip footing placed on rock mass

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Journal of Mountain Science 2024年第1期21卷 292-312页

作者： Shuvankar DAS Debarghya chakraborty Department of Civil Engineering Indian Institute of Technology KharagpurWest Bengal-721302India

This paper deals with the bearing capacity determination of strip footing on a rock mass in hilly area by considering the influence of inclined and eccentric loading. Applying the generalized HoekBrown failure criterion, the failure behavior of the rock mass is modeled with the help of the power cone programming in the lower bound finite element limit analysis framework. Using bearing capacity factor(Ns), the change in bearing capacity of the strip footing due to the occurrence of eccentrically inclined loading is presented. The variations of the magnitude of Ns are obtained by examining the effects of the Hoek-Brown rock mass strength parameters(uniaxial compressive strength(sci), disturbance factor(D), rock parameter(mi), and Geological Strength Index(GSI)) in the presence of different magnitudes of eccentricity(e) and inclination angle(λ) with respect to the vertical plane, and presented as design charts. Both the inclined loading modes, i.e., inclination towards the center of strip footing(+λ) and inclination away from the center of strip footing(-λ), are adopted to perform the investigation. In addition, the correlation between the input parameters and the corresponding output is developed by utilizing the artificial neural network(ANN). Additionally, from sensitivity analysis, it is observed that inclination angle(λ) is the most sensitive parameter. For practicing engineers, the obtained design equation and design charts can be beneficial to understand the bearing capacity variation in the existence of eccentrically inclined loading in mountain areas.

关键词： Eccentric and inclined Power cone programming Rock mass Limit analysis Artificial neural network

Flavor-alignment in an S_(3)-symmetric Higgs sector and its RG-behavior

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Chinese Physics C 2022年第12期46卷 58-67页

作者： Nabarun Chakrabarty Indrani chakraborty Department of Physics Indian Institute of TechnologyKanpur 208016India

A three Higgs-doublet model exhibiting S_(3)-symmetry can predict the observed pattern of quark masses and their mixings. However, the same symmetry also introduces potential flavor-changing neutral currents(FCNCs)at the tree level. In this study, we assume that the scalar potential contains appropriate soft S_(3)-breaking terms to maintain flexible choices of scalar masses. We identify the parameters in the Yukawa Lagrangian of the quark sector responsible for such FCNCs and constrain them using data from flavor physics observables, such as meson-decays and meson-mixings. We also validate the corresponding model parameter space via renormalization group evaluation.

关键词： beyond the standard model extended Higgs sector flavor changing neutral current

Angiotensin-converting enzyme inhibitors from plants: A review of their diversity, modes of action, prospects, and concerns in the management of diabetes-centric complications

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Journal of Integrative Medicine 2021年第6期19卷 478-492页

作者： Rakhi chakraborty Swarnendu Roy Department of Botany A.P.C.Roy Government CollegeMatigara 734010West BengalIndia Plant Biochemistry Laboratory Department of BotanyUniversity of North BengalRaja Rammohunpur 734011West BengalIndia

Angiotensin-converting enzyme(ACE)inhibitors are antihypertensive medications often used in the treatment of diabetes-related *** ACE inhibitors are known to cause serious side effects like hypotension,renal insufficiency,and ***,there has been an intensifying search for natural ACE *** plants or plant-based extracts are known to possess ACEinhibitory *** this review,articles focusing on the natural ACE inhibitors extracted from plants were retrieved from databases like Google Scholar,Pub Med,Scopus,and Web of *** have found more than 50 plant species with ACE-inhibitory *** them,Angelica keiskei,Momordica charantia,Muntingia calabura,Prunus domestica,and Peperomia pellucida were the most potent,showing comparatively lower half-maximal inhibitory concentration *** the bioactive metabolites,peptides(e.g.,Tyr-Glu-Pro,Met-Arg-Trp,and Gln-Phe-Tyr-Ala-Val),phenolics(e.g.,cyanidin-3-Osambubioside and delphinidin-3-O-sambubioside),flavonoids([-]-epicatechin,astilbin,and eupatorin),terpenoids(ursolic acid and oleanolic acid)and alkaloids(berberine and harmaline)isolated from several plant and fungus species were found to possess significant ACE-inhibitory *** were also known to possess promising antioxidant,antidiabetic,antihyperlipidemic and anti-inflammatory *** the minimal side effects and lower toxicity of herbal compounds,development of antihypertensive drugs from these plant extracts or phytocompounds for the treatment of diabetesassociated complications is an important *** review,therefore,focuses on the ACE inhibitors extracted from different plant sources,their possible mechanisms of action,present status,and any safety concerns.

关键词： Angiotensin-converting enzyme Inhibitor Herbal medicine Hyperglycaemia Hypertension Bioactive metabolite

Effect of wire tension on different output responses during wire electric discharge machining on AISI 304 stainless steel

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Defence Technology（防务技术） 2019年第4期15卷 541-544页

作者： Tina Chaudhary Arshad Noor Siddiquee arindam Kumar Chanda Department of Mechanical and Automation Engineering Indira Gandhi Delhi Technical University for Women Kashmere Gate New Delhi India Department of Mechanical Engineering Jamia Millia Islamia (a Central University) New Delhi India Department of Mechanical and Automation Engineering G.B. Pant Engineering College New Delhi India

WEDM is used in machining conductive materials where it is required to obtained complicated and intricate shapes with high *** applications are in the field of automobile,medical industries,aerospace *** is an economical machining option with short product development *** roughness,kerf width,Material removal rate,Recast layer hardness and surface microhardness in WEDM are most important *** this paper,effect of varied Wire tension on SR,KW,MRR,RCL hardness and surface microhardness on AISI 304 have been *** on time,pulse off time,current and dielectric fluid are taken as fixed *** show that Wire tension influences the SR,MRR and Surface microhardness and has no effect on kerf width in case of Stainless steel304.

关键词： Wire EDM Wire tension Material removal rate Surface roughness Kerf width Micro-hardness

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