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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

Interplay between reproduction and age selective harvesting:A case study of Hilsa(Tenualosa ilisha)fish at Sundarban estuary of northern Bay of Bengal,India

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International Journal of Biomathematics 2019年第2期12卷 239-260页

作者： Debaldev Jana Sachinandan Dutta g.p.samanta Department of Mathematics&SRM Research Institute SRM Institute of Science and Technology Kattankulathur 603 203 Tamil NaduIndia Aquatic Bioresource Research Laboratory Department of Zoology University of Calcutta 35 Ballygunge Circular RoadKolkata 700 019India Department of Mathematics Indian Institute of Engineering Science and Technology Shibpur Howrah 711103India

New offspring due to sexual reproduction is not an instantaneous process from its birth,it takes time to be sexually *** the other hand,harvesting of commercially profitable fish population before the perfect size or weight is reached is not only a commercial loss but also risks the extinction of the ***,we discuss the issue of ganges-Brahmaputra-Meghna basin,northern Bay of Bengal for the age-selective harvesting of Hilsa shad(Tenualosa ilisha)which lays eggs after its sexual *** of hilsa before its sexual maturation risks its extinction and due to lamer body weight,it is not a commercially profitable *** is a reality of Sundarban estuary for hilsa fish harvesting,therefore,biologically and economically both India and Bangladesh are facing several *** data of Frasergunje Fishing Harbor shows a clear picture as the supporting document of this mathematical problem.

关键词： Maturation delay age selective harvesting extinction risk MSY bionomic equilibrium optimal harvesting

Analysis of a hand-foot-mouth disease model

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International Journal of Biomathematics 2017年第2期10卷 1-47页

作者： Swarnali Sharma g. p. samanta Department of MathematicsIndian Institute of Engineering Science and Technology Shibpur Howrah 711103 India

In this paper, we have introduced a six-compartmental epidemic model with hand, foot and mouth disease （HFMD） infection. The total population is divided into six subclasses, namely susceptible, exposed, infective in asymptomatic phase, infective in symptomatic phase, quarantined and recovered class. Some basic properties such as boundedness and non-negativity of solutions are discussed. The basic reproduction number （R0） of the system is obtained using next generation matrix method. Then the deterministic dynamical behaviors of the system are studied. Our study includes the existence and stability analysis of equilibrium points of the system. The sensitivity analysis of our system helps us to find out the parameters of greater interest. Next, we deal with the epidemic model with three controls （two treatment controls with quarantine control）. We show that there exists an optimal control, which is effective in controlling the disease outbreak in a cost effective way. Numerical simulation is presented with the help of MATLAB, which shows tile reliability of our model from the practical point of view.

关键词： Hand, foot and mouth disease (HFMD) infection basic reproduction number equilibrium points local and global stability optimal control.

parameter uncertainty in biomathematical model described by one-prey two-predator system with mutualism

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International Journal of Biomathematics 2017年第6期10卷 147-182页

作者： D. pal g. S. Mahapatra g. p. samanta Chandrahati Dilip Kumar High School (HS) Chandrahati 712504 West Bengal India Department of Mathematics National Institute of Technology-puducherry Karaikal 609605 India Department of Mathematics Indian Institute of Engineering Science and Technology Shibpur Howrah 711103 India

In this paper, a three-species system consisting of two predators which are in mutual- ism with each other and preying on the same single prey is considered. Also, the prey and first predator are harvested under optimal conditions. The values of the biological parameters depend on the collection of data from the experts as well as on the nature of the environment in which prey predator system are considered. So the biological para- meters are not precise in reality. This paper presents a different approach to study the prey-predator model with imprecise biological parameters. All the possible equilibrium points are identified and the local as well as global stability criteria under imprecise- ness are discussed. The possibility of existence of bionomic equilibrium is discussed. The optimal harvesting policy is studied using pontryagin＇s maximum principle. Numerical examples are provided to support the proposed approach.

关键词： Mutualism equilibrium stability bioeconomic optimal control intervalnumber.

gaAs-based resonant tunneling diode:Device aspects from design,manufacturing,characterization and applications

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Journal of Semiconductors 2023年第10期44卷 26-35页

作者： Swagata samanta Department of Electronics and Communication Engineering SRM University-APAndhra PradeshIndia

This review article discusses the development of gallium arsenide(gaAs)-based resonant tunneling diodes(RTD)since the *** the best of my knowledge,this article is the first review of gaAs RTD technology which covers different epitaxialstructure design,fabrication techniques,and characterizations for various application *** is expected that the details presented here will help the readers to gain a perspective on the previous accomplishments,as well as have an outlook on the current trends and future developments in gaAs RTD research.

关键词： gallium arsenide microfabrication resonant tunneling devices

Biologics in the management of pediatric inflammatory bowel disease:When and what to choose

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World Journal of Clinical pediatrics 2025年第1期14卷 21-45页

作者： Arghya samanta Anshu Srivastava Department of pediatric gastroenterology Sanjay Gandhi Postgraduate Institute of Medical SciencesLucknow 226014Uttar PradeshIndia

pediatric inflammatory bowel disease(pIBD)is a chronic inflammatory disorder of the gastrointestinal tract,with rising global incidence and *** the past two decades,biologics have added to the therapeutic armamentarium and revolutionized the approach to treatment of inflammatory bowel *** available biologics include monoclonal antibodies which target inflammatory cytokines(anti-tumor necrosis factor alpha,anti-interleukin 12/23)or recruitment of leucocytes to the gastrointestinal tract(anti-alpha4beta7 integrin)and small molecules(Janus kinase inhibitors,sphingosine 1-phosphate-inhibitors)which modify the proinflammatory *** their potential disease-modifying ability,recent pediatric guidelines from the West have advocated upfront use of biologics in appropriate clinical scenarios as a top-down approach rather than the conventional step-up *** real-world studies are available regarding the clinical efficacy of biologics in pIBD,there is paucity of long-term outcome and safety data in ***,little information is available about the best approach in the newly industrialized-developing countries where pIBD is rising but at the same time,infections are prevalent and resources are *** this review,we summarize the efficacy and safety profile of biologics and small molecule drugs and discuss the challenges in the management of pIBD,especially in the developing world,and future directions.

关键词： Biologics Children Inflammatory bowel disease Therapeutic drug monitoring Dual biologic

An SpH Framework for Earthquake-Induced Liquefaction Hazard Assessment of geotechnical Structures

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 251-277页

作者： Sourabh Mhaski g.V.Ramana Department of Civil Engineering Indian Institute of Technology DelhiNew Delhi110016India

Earthquake-induced soil liquefaction poses significant risks to the stability of geotechnical structures *** understanding of the liquefaction triggering,and the post-failure large deformation behaviour is essential for designing resilient *** present study develops a Smoothed particle Hydrodynamics(SpH)framework for earthquake-induced liquefaction hazard assessment of geotechnical *** coupled flowdeformation behaviour of soils subjected to cyclic loading is described using the pM4Sand model implemented in a three-phase,single-layer SpH framework.A staggered discretisation scheme based on the stress particle SpH approach is adopted to minimise numerical inaccuracies caused by zero-energy modes and tensile ***,non-reflecting boundary conditions for seismic analysis of semi-infinite soil domains using the SpH method are *** numerical framework is employed for the analysis of cyclic direct simple shear test,seismic analysis of a level ground site,and liquefaction-induced failure of the Lower San Fernando *** agreement for liquefaction triggering and post-failure behaviour demonstrates that the SpH framework can be utilised to assess the effect of seismic loading on field-scale geotechnical *** present study also serves as the basis for future advancements of the SpH method for applications related to earthquake geotechnical engineering.

关键词： Earthquake seismic liquefaction stress particle pM4Sand smoothed particle hydrodynamics(SpH)

Heterogeneity of mature oligodendrocytes in the central nervous system

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Neural Regeneration Research 2025年第5期20卷 1336-1349页

作者： Chao Weng Adam M.R.groh Moein Yaqubi Qiao-Ling Cui Jo Anne Stratton g.R.Wayne Moore Jack p.Antel Neuroimmunology Unit Montreal Neurological Institute-HospitalDepartment of Neurology and NeurosurgeryMcGill UniversityMontrealQCCanada Department of Neurology Renmin Hospital of Wuhan UniversityWuhanHubei ProvinceChina

Mature oligodendrocytes form myelin sheaths that are crucial for the insulation of axons and efficient signal transmission in the central nervous *** evidence has challenged the classical view of the functionally static mature oligodendrocyte and revealed a gamut of dynamic functions such as the ability to modulate neuronal circuitry and provide metabolic support to *** the recognition of potential heterogeneity in mature oligodendrocyte function,a comprehensive summary of mature oligodendrocyte diversity is *** delve into early 20th-century studies by Robertson and Río-Hortega that laid the foundation for the modern identification of regional and morphological heterogeneity in mature ***,recent morphologic and functional studies call into question the long-assumed homogeneity of mature oligodendrocyte function through the identification of distinct subtypes with varying myelination ***,modern molecular investigations,employing techniques such as single cell/nucleus RNA sequencing,consistently unveil at least six mature oligodendrocyte subpopulations in the human central nervous system that are highly transcriptomically diverse and vary with central nervous system *** and disease related mature oligodendrocyte variation denotes the impact of pathological conditions such as multiple sclerosis,Alzheimer's disease,and psychiatric ***,caution is warranted when subclassifying mature oligodendrocytes because of the simplification needed to make conclusions about cell identity from temporally confined *** studies leveraging advanced techniques like spatial transcriptomics and single-cell proteomics promise a more nuanced understanding of mature oligodendrocyte *** research avenues that precisely evaluate mature oligodendrocyte heterogeneity with care to understand the mitigating influence of species,sex,central nervous system region,age,and disease,

关键词： aging central nervous system diseases electron microscopy heterogeneity immunohistochemistry myelin sheath natural history neuroglia oligodendroglia single-cell gene expression analysis

Hybrid Approach to Document Anomaly Detection:An Application to Facilitate RpA in Title Insurance

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International Journal of Automation and computing 2021年第1期18卷 55-72页

作者： Abhijit guha Debabrata samanta Data Science Department CHRIST(Deemed to be University)Bangalore 560029India First American India private Ltd. Bangalore 560038India Computer Science Department CHRIST(Deemed to be University)Bangalore 560029India

Anomaly detection(AD)is an important aspect of various domains and title insurance(TI)is no *** process automation(RpA)is taking over manual tasks in TI business processes,but it has its limitations without the support of artificial intelligence(AI)and machine learning(ML).With increasing data dimensionality and in composite population scenarios,the complexity of detecting anomalies increases and AD in automated document management systems(ADMS)is the least explored *** learning,being the fastest maturing technology can be combined along with traditional anomaly detectors to facilitate and improve the RpAs in *** present a hybrid model for AD,using autoencoders(AE)and a one-class support vector machine(OSVM).In the present study,OSVM receives input features representing real-time documents from the TI business,orchestrated and with dimensions reduced by *** results obtained from multiple experiments are comparable with traditional methods and within a business acceptable range,regarding accuracy and performance.

关键词： Anomaly detection title insurance autoencoder one-class support vector machine(OSVM) term frequency-inverse document frequency(TF-IDF) robotic process automation dimensionality reduction