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Fish and broiler optimal harvesting models in imprecise environment

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International Journal of Biomathematics 2017年第8期10卷 185-216页

作者： A. De k. maity G. Panigrahi Department of Applied Science Haldia Institute of Technology HaldiaPurba Medinipur West Bengal 721657 India Department of MathematicsNational Institute of Technology Durgapur Durgapur West Bengal 721309 India Department of MathematicsMugberia Gangadhar Mahavidyalaya Bhupatinagar Purba Medinipur West Bengal 721425 India

In this paper, a two-species harvesting model has been considered and developed a solu- tion procedure which is able to calculate the equilibrium points of the model where some biological parameters of the model are interval numbers. A parametric mathematical pro- gram is formulated to find the biological equilibrium of the model for different values of parameters. This interval-valued problem is converted into an equivalent crisp model using interval mathematics. The main advantage of the proposed procedure is that dif- ferent characteristics of the model can be presented in a single framework. Analytically, the existence of steady state and stabilities are look.d into. Using mathematical soft- ware, the model is illustrated and the results are obtained and presented in tabular and graphical forms.

关键词： Two species interval biological parameters equilibrium stability.

An integrated project of fish and broiler： SIS model with optimal harvesting

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International Journal of Biomathematics 2016年第6期9卷 151-179页

作者： A. De k. maity M. Maiti Department of Applied Science Haldia Institute of Technology HaldiaPurba Medinipur West Bengal 721657 India Department of MathematicsMugberia Gangadhar Mahavidyalaya Bhupatinagar Purba Medinipur West Bengal 721425 India Vidyasagar University MidnaporePaschim Medinipur West Bengal 721102 India

The paper analyzes the influence of a susceptible-infectious-susceptible （SIS） infectious disease affecting both fish and broiler species. The paper also considers a joint SIS project of fish and broiler in which the growth rates of both species vary with available nutrients and environmental carrying capacities of biomasses. The nutrients for both species are functions of the biomasses of the two species. The harvesting rates of fish and broiler depend linearly on common effort function. It is assumed that the diseases are trans- mitted to the susceptible populations by direct contact with the infected populations. Using the medicine, some portion of the infected populations are transmitted to the sus- ceptible populations. The existence of steady states and their stability are investigated analytically. The joint profit of the SIS model is maximized using Pontryagin＇s max- imum principle and corresponding optimum harvesting rates are also obtained. Using Mathematica software~ the models are illustrated and the optimum results are obtained and presented in tabular and graphical forms.

关键词： Two species SIS model biological equilibrium bioeconomic equilibrium bang-bang control optimal harvesting.

Nitration of Jharia basin coals,India:a study of structural modifications by XRD and FTIR techniques

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International Journal of Coal Science & Technology 2021年第5期8卷 1034-1053页

作者： Prabal Boral Atul k.Varma Sudip maity CSIR-Central Institute of Mining and Fuel Research PO:FRIDhanbad 828108India Department of Applied Geology Indian Institute of Technology(ISM)Dhanbad826004India

Four coal samples from Jharia basin,India are treated with nitric acid in glacial acetic acid and aqueous media to find out the chemical,petrographic and spatial structure of the organic mass by X-ray diffraction(XRD)and Fourier Transform Infrared Spectroscopy(FTIR)techniques.X-ray parameters of coal lik. interlayer spacing(d_(002)),crystallite size(L_(c)),aroamticity(f_(a)),average number of aromatic layers(N_(c)),and coal rank.I_(26)/I_(20))have been determined using profilefitting *** variation is observed in treated coals in comparison to the demineralized *** d_(002)values of treated coals have increased in both the media showing increase in disordering of organic moieties.A linear relationship has been observed between d_(002)values with the volatile matter of the ***,the d_(002)values show linear relationship with C_(dmf) contents for demineralized as well as for the treated coals in both the *** L_(c) and N_(c) values have decreased in treated coals corresponding to demineralized *** present study shows that nitration in both the media is capable of removing the aliphatic side chains from the coals and aromaticity(f_(a))increases with increase in rank.and shows a linear relationship with the vitrinite *** corresponding I_(26)/I_(20)values are least for treated coals in glacial acetic acid medium followed by raw and then to treated coals in aqueous *** studies show that coal arenes of the raw coals are converted into nitro-arenes in structurally modified coals(SMCs)in both the media,the corresponding bands at 1550-1490 and 1355-1315 cm^(-1) *** study confirms that nitration is the predominant phenomenon,though,oxidation and nitration phenomena tak.s place simultaneously during treatment with nitric acid to form *** comparison to raw coals,the SMCs show higher aromaticity and may be easily converted to coal derived products lik. activated carbon and specialty carbon materials

关键词： Coal Micro-structure Nitration XRD FTIR

Analysis of some critical aspects in hot machining of Ti-5553 superalloy: Experimental and FE analysis

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Defence Technology（防务技术） 2019年第3期15卷 344-352页

作者： Asit k.mar Parida k.lipada maity Mechanical Engineering Department Indian Institute of Technology Delhi India National Institute of Technology Rourk.la Mechanical Engineering Department India

In this study, a newly developed titanium superalloy, i.e., the Ti-5553 alloy has used for hot machining. This material replaced Ti-grade-5 alloy in the application of aerospace, automobile, and biomedical sector. However, similar to Ti-grade-5 alloy, the Ti-5553 alloy has a low thermal conductivity which mak.s it difficult-to-cut material categories hence, high tool wear, cutting force and bad surface finish. Hot machining of Ti-5553 has been studied at different machining condition (room and hot) using Deform-2D finite element analysis. The result from the simulation test was compared with the experimental value and reduction of cutting and thrust forces was observed. The experiment was carried out with the same input parameters as simulation, and good coherence between them observed. Additionally, cutting zone temperature, effective stress, etc. for both room and elevated the temperature are also discussed.

关键词： Ti-5553 Hot machining Cutting force Flank wear Finite element analysis

FEM analysis and experimental investigation of force and chip formation on hot turning of Inconel 625

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Defence Technology（防务技术） 2019年第6期15卷 853-860页

作者： Asit k.mar Parida k.lipada maity Indian Institute of Technology Delhi Department of Mechanical EngineeringIndia National Institute of Technology Rourk.la Department of Mechanical EngineeringIndia

This study investigates the hot machining of Inconel 625 alloy by using flame heating under different machining conditions using finite element analysis(FEM).Turning tests are performed at different cutting speeds and heating temperatures using uncoated carbide insert by DEFORM *** reduction in cutting force and tool wear has achieved at heating conditions compared to room *** tool life is achieved at the highest cutting speed and higher heating temperature *** heating conditions of the 600℃ continuous chip is formed whereas at room temperature saw-tooth chip formation is observed.A significant agreement is achieved between simulated and experimental cutting forces and chip *** effect of feed rates and depth of cuts are also studied experimentally during turning of Inconel 625 in a systematic manner.

关键词： Hot machining Force Inconel 625 Surface roughness Chip morphology

Toughening of Epoxy Resin with Solid Amine Terminated Poly(ethy-lene glycol) Benzoate and Effect of Red Mud Waste Particles

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Journal of Materials Science & Technology 2008年第2期24卷 272-278页

作者： B.C.Samanta T.maity S.Dalai A.k.Banthia Department of Chelnistrv and Chemical Technology Vidyasagar UniversityMidnapore-721102India Materials Science Centre Indian Institute of TechnologyKharagpur-721302India

An investigation was carried out to modify the toughness of triethylene tetramine cured DGEBA （diglycidyl ether of bisphenol-A） resin using solid amine terminated poly （ethylene glycol） benzoate （ATPEGB） as modifier with and without red mud waste particles. The solid ATPEGB modifier synthesized from the acid catalyzed esterification reaction of poly （ethylene glycol）（PEG） and 4-amino benzoic acid was characterized by Fourier transform infrared spectroscopy （FT-IR） and ^1H-NMR （nuclear magnetic resonance） spectroscopies, viscosity measurements, and solubility parameter calculation. The unfilled and red mud waste filled modified epoxy network. were evaluated with impact, adhesive, tensile, flexural and thermal properties by differential scanning calorimetry （DSC）, thermogravimetric （TG） and dynamic mechanical analysis （DMA）. The effect of modifier concentration and red mud waste particles on toughening behavior was also investigated. The optimum properties were obtained at 12.5 phr （parts per hundred parts of resin） concentration of the modifier. The ATPEGB modified cured epoxy was thermally stable up to 315℃. The morphology on fracture surfaces of cured epoxy was also analyzed by scanning electron microscopy （SEM）.

关键词： Epoxy Toughness Adhesive Morphology

Easy-to-fabricate high efficiency silicon nanowires solar cell modified by CdTe and zinc tetraphenyl porphyrin nanostructures

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Journal of Energy Chemistry 2021年第12期30卷 484-497,I0012页

作者： Debanjan maity Saurabh k.mar Pathak.Melepurath Deepa Department of Chemistry Indian Institute of Technology HyderabadKandiSangareddyTelangana 502284India

Liquid junction solar cell(LJSC) with vertically silicon nanowires(SiNWs) as the primary photosensitizer,co-sensitized with luminescent and narrow gap CdTe nanoparticles,and cuboidal microstructures of zinc tetraphenyl porphyrin(ZnTPP) dye offers broad and intense visible light absorption that translates into a maximum power conversion efficiency(PCE) of 9.09%,when combined with a polymeric gel of a I_(2)/I^(-)redox couple as the hole transport material and a counter electrode(CE) of poly(3,4-ethyelenedioxythio phene) doped with imide ions(PEDOT-N(CF_(3) SO_(2))_(2)),under 1 sun *** p-type CdTe efficiently scavenges holes from SiNWs and simultaneously allows the passage of photoexcited electrons from ZnTPP to SiNWs via electrical conduction thus imparting an enhanced solar cell *** also supresses back.electron transfer effectively,as is inferred from a ~68% enhancement in PCE compared to SiNWs *** of the CE entailed the evaluation of the effect of dopant anion:imide versus dicyanamide in PEDOT,and revealed that the presence of macro-crack. in the polymer surface,a deeper work.function,and a lower electrical conductance are the shortcomings of the dicyanamide doped PEDOT and reduce the overall PCE,compared to *** study brings out how by judicious choice of photoanode and CE components,efficient,stable and easy-to-assemble LJSCs can be developed.

关键词： Silicon Nanowires Porphyrin Solar cell Hole transfer

Strain-induced fast domain wall motion in hybrid piezoelectric-magnetostrictive structures with Rashba and nonlinear dissipative effects

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Acta Mechanica Sinica 2024年第9期40卷 83-97页

作者： Sumit maity Sarabindu Dolui Sharad Dwivedi Department of Mathematics School of SciencesNational Institute of Technology Andhra PradeshTadepalligudem 534101India

The prime objective of this work.is to analyze the motion of magnetic domain walls(DWs)in a thin layer of magnetostrictive material that is perfectly attached to the upper surface of a thick.piezoelectric *** our analysis,we consider a transversely isotropic hexagonal subclass of magnetostrictive materials that demonstrate structural inversion *** this aim,we utilize the one-dimensional extended Landau-Lifshitz-Gilbert equations,which describe the magnetization dynamics under the influence of various factors such as magnetic fields,spin-polarized electric currents,magnetoelastic effects,magnetocrystalline anisotropy,Rashba fields,and nonlinear dry-friction *** employing the standard traveling wave ansatz,we derive an analytical expression of the most relevant dynamic features:velocity,mobility,threshold,break.own,and propagation direction of the DWs in both steady and precessional dynamic *** analytical investigation provides insights into how effectively the considered parameters can control the DW ***,numerical illustrations of the obtained analytical results show a qualitative agreement with the recent observations.

关键词： Domain wall Magnetoelastic field Extended Landau-Lifshitz-Gilbert equation Dry-friction dissipation Rashba effect

Collisions and protein aggregations ahead: how aging affects ribosomal elongation dynamics

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Signal Transduction and Targeted Therapy 2022年第5期7卷 1369-1370页

作者： Pallab maity Sebastian Iben Department of Dermatology and Allergic Diseases Ulm UniversityUlmGermany

A recent study by Stein et al.1 deciphers how altered ribosomal elongation dynamics in aging contribute to a loss of protein homeostasis,***,the balance of protein synthesis,maintenance and degradation is severely affected in aging causing aging-associated neurodegenerative *** the contributions of disturbances in protein maintenance and degradation to the development of the disease have attracted much attention over the past decades,there is scant k.owledge about protein synthesis dynamics in aging.

关键词： aging dynamics synthesis