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A hybrid BFA-PSO algorithm for economic dispatch with valve-point effects

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Frontiers in Energy 2012年第2期6卷 155-163页

作者： t.jayabarathi Prateek BAHL Harsha OHRI Afshin YAZDANI V. RAMESH School of Electrical Engineering V I T University Vellore 632014India

this paper presents a novel and efficient method for solving the economic dispatch （ED） problems with valve-point effects, by integrating the biased velocity of particle swarm optimization （PSO） to the chemotaxis, swarming and reproduction steps of bacterial foraging algorithm （BFA）. to include valve point effects sinusoidal terms are added to the fuel cost function. this makes the ED problems highly non-linear. In order to solve such problems the best cell （or particle） biased velocity （vector） is added to the random velocity of the BFA to reduce randomness in movement （evolution） and to increase swarming. this results in the hybrid bacterial foraging algorithm （HBFA）. to demonstrate the effectiveness of the proposed HBFA method, numerical studies have been performed for three different sample systems. Comparison of the results obtained by the HBFA with the BFA and other evolutionary algorithms clearly show that the proposed method outperforms other methods in terms of convergence rate and solution quality in solving the ED problems with valve-point effects.

关键词： bacterial foraging algorithm (BFA) economic dispatch (ED) particle swarm optimization (PSO) valve- point effects

A novel power system reconfiguration for a distribution system with minimum load balancing index using bacterial foraging optimization algorithm

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Frontiers in Energy 2012年第3期6卷 260-265页

作者： K. Sathish KUMAR t. jayabarathi School of Electrical Engineering VIT University Vellore 632014 India

In this paper, the objective of minimum load balancing index （LBI） for the 16-bus distribution system is achieved using bacterial foraging optimization algorithm （BFOA）. the feeder reconfiguration problem is formulated as a non-linear optimization problem and the optimal solution is obtained using BFOA. With the proposed reconfiguration method, the radial structure of the distribution system is retained and the burden on the optimization technique is reduced. test results are presented for the 16-bus sample network, the proposed reconfiguration method has effectively decreased the LBI, and the BFOA technique is efficient in searching for the optimal solution.

关键词： bacterial foraging optimization algorithm(BFOA) distribution system network reconfiguration,load balancing index (LBI) radial network

Magnetosymbiosis discovery:new perspectives in magnetotaxis research

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Journal of Oceanology and Limnology 2025年第1期43卷 177-186页

作者： Caroline L.MONtEIL Christopher t.LEFEVRE Aix-Marseille Université CEACNRSInstitute of Biosciences and Biotechnologies of Aix-MarseilleSaint-Paul-lez-Durance 13115France

Magnetotactic bacteria have been the only known magnetoreceptive microorganisms for *** if the existence of magnetotactic protists was suggested in 1986,this is only 30 years later that magnetotaxis was extended to the domain of Eukaryota,thanks to the characterization of magnetotactic symbiotic assemblies composed of a flagellated protist and bacteria biomineralizing magnetic *** mutualistic ectosymbiosis relies on a collective magnetotaxis coupled to a hydrogen-based *** new form of cooperation challenges our view of magnetic biomineralization in prokaryotes and magnetoreception in *** this review,we present how magnetosymbiosis was discovered and how cooperation ***,we discuss the future research and the new perspectives such discovery brought to the field of magnetotaxis.

关键词： magnetotaxis biomineralization symbiosis magnetotactic

Application of the invasive weed optimization algorithm to economic dispatch problems

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Frontiers in Energy 2012年第3期6卷 255-259页

作者： t. jayabarathi Afshin YAZDANI V. RAMESH School of Electrical Engineering VIT University Vellore 632014 India

In this paper the invasive weed optimization algorithm has been applied to a variety of economic dispatch （ED） problems. the ED problem is concerned with minimizing the fuel cost by optimally loading the electrical generators which are committed to supply a given demand. Some involve prohibited operating zones, transmission losses and valve point loading. In general, they are non-linear non-convex optimization problems which cannot be directly solved by conventional methods. In this work the invasive weed algorithm, a meta-heuristic method inspired by the proliferation of weeds, has been applied to four numerical examples and has resulted in promising solutions compared to published results.

关键词： economic dispatch (ED) invasive weed optimization non-convexity prohibited operating zones(POZ) valve point loading meta-heuristic

Combined heat and power economic dispatch problem using firefly algorithm

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Frontiers in Energy 2013年第2期7卷 133-139页

作者： Afshin YAZDANI t. jayabarathi V. RAMESH t. RAGHUNAtHAN School of Electrical Engineering VIT University Vellore 632014 India

Cogeneration units, which produce both heat and electric power, are found in many process industries. these industries also consume heat directly in addition to electricity. the cogeneration units operate only within a feasible zone. Each point within the feasible zone consists of a specific value of heat and electric power. these units are used along with other units, which produce either heat or power exclusively. Hence, the economic dispatch problem for these plants to optimize the fuel cost is quite complex and several classical and meta-heuristic algo- rithms have been proposed earlier. this paper applies the firefly algorithm, which is inspired by the behavior of fireflies which attract each other based on their luminosity. the results obtained have been compared with those obtained by other methods earlier and showed a marked improvement over the earlier methods.

关键词： combined heat and power (CHP) economicdispatch meta-heuristic algorithm firefly algorithm cogen-eration

Combined heat and power economic dispatch problem using the invasive weed optimization algorithm

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Frontiers in Energy 2014年第1期8卷 25-30页

作者： t. jayabarathi Afshin YAZDANI V. RAMESI t. RAGHUNAtHAN School of Electrical En~ineerinz VIT University Vellore 632014 India

Cogeneration units which produce both heat and electric power are found in many process industries. these industries also consume heat directly in addition to electricity. the cogeneration units operate only within a feasible zone. Each point within the feasible zone consists of a specific value of heat and electric power. these units are used along with other units which produce either heat or power exclusively. Hence the economic dispatch problem for these plants optimizing the fuel cost is quite complex and several classical and meta-heuristic algo- rithms have been proposed earlier. this paper applies the invasive weed optimization algorithm which is inspired by the ecological process of weed colonization and distribu- tion. the results obtained have been compared with those obtained by other methods earlier and showed a marked improvement over earlier ones.

关键词： combined heat and power (CHP) economicdispatch meta-heuristic algorithm invasive weed optimiza-tion cogeneration

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

Solution to economic dispatch loading effect by using catfish problem with valve-point PSO algorithm

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Frontiers in Energy 2014年第3期8卷 290-296页

作者： K. MURALI, t. jayabarathi School of Electrical Engineering VIT University Vellore 632014 India

this paper proposes application of a catfish particle swarm optimization （PSO） algorithm to economic dispatch （ED） problems. the ED problems considered in this paper include valve-point loading effect, power balance constraints, and generator limits. the conventional PSO and catfish PSO algorithms are applied to three different test systems and the solutions obtained are compared with each other and with those reported in literature. the comparison of solutions shows that catfish PSO outperforms the conventional PSO and other methods in terms of solution quality though there is a slight increase in computational time.

关键词： economic dispatch (ED) valve point loading,catfish particle swarm optimization (PSO) optimization

Circadian nutrition:is meal timing an elixir for fatigue?

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Science Bulletin 2025年第3期70卷 309-312页

作者： Zhihui Zhang Lu Yan Jonas t.treebak Min-Dian Li Department of Cardiovascular Medicine Center for Circadian Metabolism and Cardiovascular DiseaseSouthwest HospitalArmy Medical UniversityChongqing 400038China Ministry of Education(MOE)Key Laboratory of Geriatric Cardiovascular and Cerebrovascular Disease Chongqing 400038China Novo Nordisk Foundation Center for Basic Metabolic Research Faculty of Health and Medical SciencesUniversity of CopenhagenCopenhagen 2200Denmark

Fatigue is increasingly prevalent in industrialized societies,highlighting an urgent need for effective clinical and lifestyle *** manifests as reduced muscle endurance,strength and a persistent sensation of exhaustio... 详细信息

关键词： fatigue strength sensation