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Multi-objective optimization of the kinematic parameters of fish-like swimming using a genetic algorithm method

Journal of Hydrodynamics 2019年第2期31卷 333-344页

作者： mahdi abolfazli esfahani Hamid Reza Karbasian Kyung Chun Kim Department of Electrical and Electronics Engineering Nanyang Technological UniversitySingapore School of Mechanical Engineering Pusan National UniversityBusan 46241Korea

This paper investigates the kinematic optimization of fish-like ***,an experiment was performed to detect the motion of the fish tail foil of a fish ***,the kinematic swimming model was verified experimentally using an image processing *** model includes two rotational motions:caudal foil motion and foil-pitching *** kinematic model allows us to evaluate the influence of motion trajectory in the optimization *** optimize the propulsive efficiency and thrust,a multi-objective genetic algorithm was employed to handle with kinematic,hydrodynamic,and propulsion *** results show that the caudal length has a significant effect on the performance of the flapping foil in fish-like swimming,and its influence on the motion trajectory may increase the propulsive efficiency to as high as 98%in ideal *** maximum thrust coefficient can also reach approximately 3 in ideal conditions.

关键词： Fish-like swimming fish robot hydrodynamics optimization genetic algorithm

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Effect of Gold Nanoparticle on Percentage Depth Dose of 18 MV X-Ray in MAGICA Polymer Gel Dosimeter

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Open Journal of Microphysics 2013年第2期3卷 28-33页

作者： Mohammad Mahdavi Mahbobeh Khadem-abolfazli Seyed Rabee mahdi Mahdavi Gholamreza Ataei Medical Physics Department Tehran University of Medical Sciences Tehran Iran Para Medical Department Babol University of Medical Sciences Babol Iran Physics Department Mazandaran University Babolsar Iran

Radiation-sensitive polymer gels are among the most promising three-dimensional dose verification tools and tissue-like phantom developed to date. This study is an investigating of percentage depth dose enhancement within the gel medium with the use of conformal distribution gold nanoparticle as contrast agents by high atomic number material. In this work, the normoxic polymer gel dosimeter MAGICA tissue-equivalence was first theoretically verified using MCNPX Monte Carlo code and experimentally by percentage depth dose curves within the gel medium. Then gold nanoparticles (GNPs) of 50 nm diameter with different concentrations of 0.1 mM, 0.2 mM, and 0.4 mM were embedded in MAGICA gel and irradiated by 18 MV photon beam. Experimental results have shown dose increase of 10%, 2% and 4% in 0.1 mM, 0.2 mM and 0.4 mM concentrations, respectively. Simulation results had good agreement in the optimum concentration of 0.1 mM. The largest error between experimental and simulation results was equal to 9.28% stood for 0.4 mM concentration. The results showed that the optimum concentration of gold nanoparticles to achieve maximum absorbed dose in both experimental and simulation was 0.1 mM and so it can be used for clinical studies.

关键词： Percentage Depth Dose Polymer Gel Dosimeter Gold Nanoparticles

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