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Switching effect on a two prey-one predator system with strong Allee effect incorporating prey refuge

International Journal of Biomathematics 2024年第2期17卷 1-50页

作者： Sangeeta saha Guruprasad Samanta Department of Mathematics Indian Institute of Engineering Science and Technology Shibpur Howrah 711103India

In an environment,the food chains are balanced by the prey-predator *** a predator species is provided with more than one prey population,it avails the option of prey switching between prey species according to their ***,prey switching of predators mainly helps to increase the overall growth rate of a predator *** this work,we have proposed a two prey-one predator system where the predator population adopts switching behavior between two prey species at the time of *** the prey population exhibit a strong Allee effect and the predator population is considered to be a generalist *** proposed system is biologically well-defined as the system variables are positive and do not increase abruptly with *** local stability analysis reveals that all the predator-free equilibria are saddle points whereas the prey-free equilibrium is always *** intrinsic growth rates of prey,the strong Allee parameters,and the prey refuge parameters are chosen to be the controlling parameters *** numerical simulation reveals that in absence of one prey,the other prey refuge parameter can change the system dynamics by forming a stable or unstable limit ***,a situation of bi-stability,tri-stability,or even multi-stability of equilibrium points occurs in this *** in presence of the switching effect,the predator chooses prey according to their abundance,so,increasing refuge in one prey population decreases the count of the second prey *** is also observed that the count of predator population reaches a comparatively higher value even if they get one prey population at its fullest quantity and only a portion of other prey ***,in the scarcity of one prey species,switching to the other prey is beneficial for the growth of the predator population.

关键词： Prey-predator model switching effect strong Allee effect prey refuge

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Model Predictive Control of Resonant Systems Using Kautz Model

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International Journal of Automation and computing 2016年第5期13卷 501-515页

作者： Shamik Misra Rajasekhara Reddy Prabirkumar saha Department of Chemical Engineering Indian Institute of Technology Guwahati

The scope of this paper broadly spans in two areas： system identification of resonant system and design of an efficient control scheme suitable for resonant systems. Use of filters based on orthogonal basis functions （OBF） have been advocated for modelling of resonant process. Kautz filter has been identified as best suited OBF for this purpose. A state space based system identification technique using Kautz filters, viz. Kautz model, has been demonstrated. Model based controllers are believed to be more efficient than classical controllers because explicit use of process model is essential with these modelling techniques. Extensive literature search concludes that very few reports are available which explore use of the model based control studies on resonant system. Two such model based controllers are considered in this work, viz. model predictive controller and internal model controller. A model predictive control algorithm has been developed using the Kautz model. The efficacy of the model and the controller has been verified by two case studies, viz. linear second order underdamped process and a mildly nonlinear magnetic ball suspension system. Comparative assessment of performances of these controllers in those case studies have been carried out.

关键词： Model predictive control resonant systems Kautz model orthonormal basis function internal model control

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Influence of land cover features on avian community and potential conservation priority areas for biodiversity at a Ramsar site in India

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Ecological Processes 2022年第1期11卷 345-359页

作者： Souvik Barik Goutam Kumar saha Subhendu Mazumdar Department of Zoology University of Calcutta35Ballygunge Circular RoadKolkata 700019India Department of Zoology Shibpur Dinobundhoo Institution(College)ShibpurHowrahIndia

Background:Wetlands provide diverse ecological services to sustain rich biodiversity,but they are recklessly exploited around the *** Kolkata Wetlands(EKW;Ramsar site No.1208,~125 km^(2))was once very rich in faunal diversity that declined over the years due to various anthropogenic *** such scenarios,effective management plans need to contemplate local and landscape level initiatives and prioritize areas for *** the foraging guild structure and spatial patterns of relationship between bird and its environment provides important insight of ecological processes of ***,we carried out extensive surveys in 142 point count stations to explore the diversity and foraging guild structure of birds in *** addressed two important questions that how bird diversity varied from the outer periphery of the city towards the wetlands and how bird diversity is influenced by land cover features at local and landscape level in wetland *** goal of this study was to prepare a spatial map of avian diversity and to find the conservation priority areas for birds in this internationally recognized wetland ***:We recorded 94 species of birds and the Shannon diversity index values ranged between 1.249 and *** found that the avian diversity increased with increasing distance from city *** and insectivores were the dominant foraging guilds,followed by carnivores,granivores,frugivores and *** Linear Models revealed that bird communities were positively influenced by areas of wetlands,dikes and banks,agricultural field and emergent vegetation,and negatively influenced by built-up *** the projected spatial map of species diversity,74.15 km^(2)area has high ***,we identified 12.82 km^(2) of top 10%conservation priority ***:Low bird diversity near city periphery is related to habitat degradation due to anthropogenic *** of omnivores and insectivores

关键词： Bird diversity Spatial mapping FRAGSTATS ZONATION Wetland management East Kolkata Wetlands

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Reliability of IEC 61850 based substation communication network architecture considering quality of repairs and common cause failures

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Protection and Control of Modern Power Systems 2022年第1期7卷 174-188页

作者： Vonani Clive Mathebula Akshay Kumar saha School of Engineering Discipline of ElectricalElectronics and Computer EngineeringUniversity of KwaZulu-NatalDurbanSouth Africa

Mission-critical IEC 61850 system architectures are designed to tolerate hardware failures to achieve the highest reliability ***,multi-channel systems are used in such systems within industrial facilities to isolate machinery when there are process ***,multi-channel systems introduce Common Cause Failure(CCF)since the subsystems can rarely be *** paper integrates CCF into the Markov reliability model to enhance the model flexibility to investigate synchronous generator intra-bay SCN architecture reliability performance considering the quality of repairs and *** Markov process enables integration of the impact of CCF factors on system *** case study results indicate that CCF,coupled with imperfect repairs,significantly reduce system reliability *** sensitivity is observed at low levels of CCF,whereas the highest level of impact occurs when the system diagnostic coverage is 99%based on ISO 13849-1,and reduces as the diagnostic coverage level ***,it is concluded that the severity of CCF depends more on system diagnostic coverage level than the repair efficiency,although both factors impact the system overall ***,CCF should be con-sidered in determining the reliability performance of mission-critical communication networks in power distribution centres.

关键词： IEC 61850 Substation communication network(SCN) Reliability Common cause failure(CCF) Diagnostic coverage Repair efficiency Sensitivity Elasticity Markov Matrix calculus

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Thermal conductivity of dense hcp iron:Direct measurements using laser heated diamond anvil cell

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Geoscience Frontiers 2020年第5期11卷 1755-1761页

作者： Pinku saha Aritra Mazumder Goutam Dev Mukherjee National Centre for High Pressure Studies Department of Physical SciencesIndian Institute of Science Education and Research KolkataMohanpur CampusMohanpur741246NadiaWest BengalIndia

Thermal conductivity(k)of iron is measured up to about 134 *** measurements are carried out using the single sided laser heated diamond anvil cell,where the power absorbed by a Fe metal foil at hotspot is calculated using a novel thermodynamical *** conductivity of fee(γ)-Fe increases up to a pressure of about46 *** find thermal conductivity values in the range of 70-80 Wm-1K-1(with an uncertainty of 40%),almost constant with pressure,in the hcp(e)phase of *** attribute the pressure independent k above 46 GPa to the strong electronic correlation effects driven by the electronic topological transition(ETT).We predict a value of thermal conductivity ofε-Fe of about 40±16 Wm-1K-1 at the outer core of Earth.

关键词： Laser heated diamond anvil cell Thermal conductivity High pressure effects Geodynamo

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Optical characterization of nano-sized organic carbon particles emitted from a small gasoline engine

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Particuology 2013年第3期11卷 249-255页

作者： Bireswar Paul Amitava Datta Aparna Datta Abhijit saha Department of Power Engineering Jadavpur University UGC-DAE Consortium for Scientific Research

The nano-sized organic carbon （NOC） particles emitted from a small gasoline engine were characterized using various ex situ optical techniques to assess their hazardous impact. The exhaust gas was sampled iso-kinetically by a quartz probe and passed through de-ionized water to gather the hydrophilic car- bonaceous particulates as hydrosol. The hydrodynamic diameter of the particles ranged between 1.7 and 3.6 nm at no load, with a mean diameter of 2.4 nm. The particle size in the engine exhaust was found to increase at higher loads, which is attributed to coagulation of the particles. The chemical structure of the particles was analyzed using UV-vis and infra-red spectroscopy. Both the band gap energy and oscillator strength data evaluated from the UV-vis absorbance showed that the NOC particles contained polyaromatic hydrocarbon structures with three to five aromatic rings. Infra-red spectroscopy analysis further confirmed the presence of aliphatic and carbonyl functionalities in the aromatic structures of the particles. The fine size of the particles, their high number concentration for the type of the engine under study and their structural features, make the particles extremely hazardous for environment and health.

关键词： Gasoline engine Combustion Emission Carbon nano-particle Characterization

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Study of anti ulcer activity of Ficus religiosa *** experimentally induced gastric ulcers in rats

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Asian Pacific Journal of Tropical Medicine 2010年第10期3卷 791-793页

作者： Sarmistha saha Gagan Goswami Department of Zoology Gujarat University NIPER Ahmedabad

Objective:To investigate the gastroprotective activity of hydroalcoholic extract leaves of Ficus religiosa(***) in different experimental models of gastric ulcer in ***:The hydroalcoholic extract leaves of *** were studied at two dose levels(250 and 500 mg/ kg,oral) in rats against absolute ethanol(0.2 mL oral),aspirin(200 mg/kg) and pyloric ligation induced gastric ***(50 mg/kg,oral) was used as a standard *** ulcer indices and oxidative stress were *** tests and acute toxicity tests were also carried ***:Administration of *** to rats significantly decreased the ulcer index value when compared with the control treated ***(50 mg/kg,oral) also produced a significant decrease the ulcer index value when compared with the control treated *** analysis revealed the presence of tannins,sterols,saponins,flavonoids, carbohydrates and ***:The results suggest that the leaves of the *** possess significant anti ulcer activity.

关键词： Antiulcer Ficus religiosa Ethanol Aspirin Pyloric ligation

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Abscisic Acid Signal off the STARTing Block

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Molecular Plant 2011年第4期4卷 562-580页

作者： Archana Joshi-saha Christiane Valon Jeffrey Leung Institut des Sciences du Vegetal Centre National de la Recherche Scientifique UPR2355 1 Avenue de la Terrasse Bat. 23 91198 Gif-sur-Yvette France

The year 2009 marked a real turnaround in our understanding of the mode of abscisic acid （ABA） action. Nearly 25 years had elapsed since the first biochemical detection of ABA-binding proteins in the plasmalemma of Vicia guard cells was reported. This recent--and laudable--achievement is owed largely to the discovery of the soluble ABA receptors whose major interacting proteins happen to be some of the most well-established components of earliest steps in ABA signaling. These soluble receptors, with the double name of PYRABACTIN RESISTANCE （PYR） or REGULATORY COMPONENT OF ABA RECEPTOR （RCAR）, are a family of Arabidopsis proteins of about 150-200 amino acids that share a conserved START domain. The ABA signal transduction circuitry under non-stress conditions is muted by the clade A protein phosphatases 2C （PP2C）（notably HAB1, ABI1, and ABI2）. During the initial steps of ABA signaling, the binding of the hormone to the receptor induces a conformational change in the latter that allows it to sequester the PP2Cs. This excludes them from the negative regulation of the downstream ABA-activated kinases （OST1/SnRK2.6/SRK2E, SnRK2.2, and SnRK2.3）, thus unleashing the pathway by freeing them to phosphorylate downstream targets that now include several b-ZIP transcription factors, ion channels （SLAC1, KAT1）, and a NADPH oxidase （AtrbohF）. The discovery of this family of soluble receptors and the rich insight already gained from structural studies of their complexes with different isoforms of ABA, PP2C, and the synthetic agonist pyrabactin lay the foundation towards rational design of chemical switches that can bolster drought hardiness in plants.

关键词： Abiotic/environmental stress hormone biology signal transduction.

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Fabrication and Characterization of Banana Pseudostem Fibre Reinforced Epoxy Hybrid Composite Using Al_(2)O_(3) as Filler

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Journal of Bionic Engineering 2023年第4期20卷 1737-1746页

作者： Ankit Samal Sanjeev Kumar Manish Bhargava Barnik saha Roy Mechanical Engineering Department National Institute of Technology AgartalaJiraniaTripura799046India Mechanical Engineering Department Subharti Institute of Technology and EngineeringMeerutUttar Pradesh250005India

Natural fibre-reinforced composites are now becoming incredibly common in various products because of their comparable qualities to conventional *** to its availability,superior mechanical qualities,and low cost,banana pseudostem is extensively used in various applications requiring natural *** study investigates the physical and mechanical properties of epoxy composites reinforced with banana pseudostem fibres that contain Al_(2)O_(3) *** order to produce composites with fibre and filler loadings,manual hand layup was *** and filler loading effects on composite properties were studied in *** results of the investigations demonstrate that proportion of Al_(2)O_(3) in composites significantly influences their mechanical and physical ***,the composite with a fibre content of 30%shows improved mechanical proportions and *** analysis was used to study the composite's thermal *** are more thermally stable than raw *** Transform Infrared Spectroscopy and Scanning electron microscopy analyses were used to characterize the composites.

关键词： Banana Pseudostem fibre Al_(2)O_(3) Epoxy Characterization Mechanical properties

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A new parameter setting-based modified differential evolution for function optimization

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International Journal of Modeling, Simulation, and Scientific Computing 2020年第4期11卷 97-120页

作者： Sukanta Nama Apu Kumar saha Department of Mathematics Ramthakur College Agartala West TripuraA.D.Nagar 799003India Department of Mathematics National Institute of Technology Agartala BarjalaJiraniaAgartalaTripura 799046India

The population-based efficient iterative evolutionary algorithm(EA)is differential evolution(DE).It has fewer control parameters but is useful when dealing with complex problems of optimization in the real world.A great deal of progress has already been made and implemented in various fields of engineering and ***,DE is prone to the setting of control parameters in its performance ***,the appropriate adjustment of the time-consuming control parameters is necessary to achieve optimal DE *** research proposes a new version of the DE algorithm control parameters and mutation *** the justifiability of the suggested method,several benchmark functions are taken from the *** test results are contrasted with other literary algorithms.

关键词： Differential evolution evolutionary algorithm unconstrained function optimization CEC2005 benchmark functions.

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