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一种求解复杂约束优化问题的粒子动力学演化算法 被引量:1
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作者 李康顺 李元香 +1 位作者 康立山 李邦河 《模式识别与人工智能》 EI CSCD 北大核心 2006年第4期538-545,共8页
根据输运理论中的粒子输运方程、相空间能量最小原理和熵增法则,构造一种能够高效求解带约束条件优化问题的动力学演化算法(CPDEA)。并利用这种能量和熵的变化使整个粒子系统从非平衡达到平衡的理论来定义适应值函数,使得所有的个体都... 根据输运理论中的粒子输运方程、相空间能量最小原理和熵增法则,构造一种能够高效求解带约束条件优化问题的动力学演化算法(CPDEA)。并利用这种能量和熵的变化使整个粒子系统从非平衡达到平衡的理论来定义适应值函数,使得所有的个体都能够有机会参与杂交和变异,最终达到快速求出约束优化问题的所有全局最优解的目的。在数据实验中通过用该算法求解一些复杂的带约束条件的函数优化问题并得到较好的结果。同时实验还显示,该算法不仅能快速容易地求出复杂的带约束优化问题的所有全局最优解,而且还能避免求解问题的早熟现象。 展开更多
关键词 粒子相空间 动力学演化算法 粒子输运理论 约束优化问题 粒子
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Reconstructing the neutrally-buoyant particle flow near a singular corner
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作者 Francesco Romanò 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2022年第8期41-48,共8页
The correction of buoyancy effects is tackled for particles moving close to a singular corner in creeping flow conditions.A few density-mismatched particle trajectories are used to reconstruct the dynamics of a neutra... The correction of buoyancy effects is tackled for particles moving close to a singular corner in creeping flow conditions.A few density-mismatched particle trajectories are used to reconstruct the dynamics of a neutrally-buoyant particle all over the target domain.We propose to take advantage of the dissipative dynamics of density-mismatched particles in order to probe the target domain.Thereafter,we retrieve the neutrally-buoyant particle flow all over the domain by reconstructing the phase space of the density-mismatched particulate flow and taking the limit of the particle-to-fluid density ratio tending to one.The robustness of such an approach is demonstrated by deliberately ill-conditioning the reconstruction operator.In fact,we show that our algorithm well performs even when we rely on qualitatively-different density-mismatched orbit topologies or on bundles of close trajectories rather than homogeneously distributed orbits.Potential applications to microfluidics and improvements of the proposed algorithm are finally discussed. 展开更多
关键词 Stokesian dynamics MICROFLUIDICS Particle/fluid flow
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Optical tweezers technique and its applications 被引量:9
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作者 GUO HongLian LI ZhiYuan 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2013年第12期2351-2360,共10页
Since their advent in the 1980s,optical tweezers have attracted more and more attention due to their unique non-contact and non-invasion characteristics and their wide applications in physics,biology,chemistry,medical... Since their advent in the 1980s,optical tweezers have attracted more and more attention due to their unique non-contact and non-invasion characteristics and their wide applications in physics,biology,chemistry,medical science and nanoscience.In this paper,we introduce the basic principle,the history and typical applications of optical tweezers and review our recent experimental works on the development and application of optical tweezers technique.We will discuss in detail several technological issues,including high precision displacement and force measurement in single-trap and dual-trap optical tweezers,multi-trap optical tweezers with each trap independently and freely controlled by means of space light modulator,and incorporation of cylindrical vector optical beams to build diversified optical tweezers beyond the conventional Gaussian-beam optical tweezers.We will address the application of these optical tweezers techniques to study biophysical problems such as mechanical deformation of cell membrane and binding energy between plant microtubule and microtubule associated proteins.Finally we present application of the optical tweezers technique for trapping,transporting,and patterning of metallic nanoparticles,which can be harnessed to manipulate surface plasmon resonance properties of these nanoparticles. 展开更多
关键词 optical tweezers small particle force measurement NANOPHOTONICS
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