检索结果-南通市图书馆

dynamic scaling of Ramified Clusters Formed on Liquid Surfaces

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2006年第2X期46卷 332-336页

作者： WU Feng-Min XU You-Sheng LI Qiao-Wen College of Mathematics and Physics Zhejiang Normal University Jinhua 321004 China College of Science Zhejiang University of Technology Hangzhou 310014 China

A comprehensive simulation model -- deposition, diffusion, rotation, reaction and aggregation model is presented to simulate the formation processes of ramified clusters on liquid surfaces, where clusters can disuse and rotate easily. The mobility （including diffusion and rotation） of clusters is related to its mass, which is given by Dm = Dos^-γD and θm = θos^-γθ, respectively. The influence of the reaction probability on the kinetics and structure formation is included in the simulation model. We concentrate on revealing dynamic scaling during ramified cluster formation. For this purpose, the time evolution of the cluster density and the weight-average cluster size as well as the cluster-size distribution scaling function at different time are determined for various conditions. The dependence of the cluster density on the deposition flux and time-dependence of fractal dimension are also investigated. The obtained results are helpful in understanding the formation of clusters or thin film growth on liquid surfaces.

关键词： dynamic scaling liquid surface ramified cluster kinetic Monte-Carlo simulation

维普期刊数据库

Influences of Fractal Substrate Structures on dynamic scaling Behaviors of Etching Model

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2017年第10期67卷 471-477页

作者：宋丽建唐刚寻之朋郝大鹏陈祎力张哲 School of Physical Science and Technology China University of Mining and Technology CAS Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences University of Chinese Academy of Sciences

The Etching model on various fractal substrates embedded in two dimensions was investigated by means of kinetic Mento Carlo method in order to determine the relationship between dynamic scaling exponents and fractal parameters. The fractal dimensions are from 1.465 to 1.893, and the random walk exponents are from 2.101 to *** is found that the dynamic behaviors on fractal lattices are more complex than those on integer dimensions. The roughness exponent increases with the increasing of the random walk exponent on the fractal substrates but shows a non-monotonic relation with respect to the fractal dimension. No monotonic change is observed in the growth exponent.

关键词： Etching model fractal substrates dynamic scaling

维普期刊数据库

dynamic scaling behaviour of late-stage phase separation in Ni75AlxV25-x alloys

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2007年第3期16卷 854-861页

作者：李永胜陈铮卢艳丽徐国栋 State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 China

The dynamic scaling behaviour of late-stage phase separation and coarsening mechanisms of L12 and D022 in Ni75AlxV25-x （3 ≤ x ≤ 10, at.%） alloys are studied using the microscopic phase-field dynamic model. The microelaso ticity field is incorporated into the diffusion dynamic model. The results show the morphology and coarsening dynamics being greatly changed by the elastic interactions among different precipitates, the particles aligning along the dominant directions, the average domain size （ADS） of L12 and D022 deviating from the exponent of temporal power-law, and the growth slowing down due to the increasing of elastic interactions. The dynamic scaling regime of late-stage coarsening of the precipitates is attained. Thus the scaling behaviour of structure function is also applicable for elastic interaction systems. It is also found that the variations of ADS and scaling function depend on the volume fraction of precipitates.

关键词： phase separation dynamic scaling elastic interaction microscopic phase-field simulation

Adaptive Output Feedback for Nonlinear Feedforward Systems with Multiple State and Input Delays via dynamic High-Gain scaling

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Adaptive Output Feedback for Nonlinear Feedforward Systems w...

Full-State-Constrained Non-Certainty-Equivalent Adaptive Control for Satellite Swarm Subject to Input Fault

第二十九届中国控制会议

作者： P.Krishnamurthy F.Khorrami Control/Robotics Research Laboratory Dept.of ECEPolytechnic Institute of NYU

A general class of nonlinear systems containing multiple delays in both state and input is considered and an output-feedback control design is *** class of systems considered consists of a nominal system of feedforward form as well as appended uncertain *** state and input delays are allowed to be time-varying and *** delayed and undelayed versions of the input signal are allowed to enter into the *** robust adaptive control design is designed based on our recent results on dual dynamic high-gain scaling based control designs for feedforward *** control implementation is delay-independent and does not require knowledge of the time delays or any magnitude bounds thereof;the only information about the time delays that is required is a bound on the rate of variation of time delays.

关键词： Feedforward Systems Time Delay Adaptive Control Robustness Nonlinear Systems High Gain dynamic scaling

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2022年第3期9卷 482-495页

作者： Zhiwei Hao Xiaokui Yue Haowei Wen Chuang Liu National Key Laboratory of Aerospace Flight dynamics School of AstronauticsNorthwestern Polytechnical UniversityXi’an 710072China IEEE

Satellite swarm coordinated flight(SSCF)technology has promising applications,but its complex nature poses significant challenges for control *** response,this paper proposes an easily solvable adaptive control scheme to achieve high-performance trajectory tracking of the SSCF system subject to actuator efficiency losses and external *** existing adaptive controllers based on the certaintyequivalent(CE)principle show unpredictability and nonconvergence in their online parameter *** overcome the above vulnerabilities and the difficulties caused by input failures of SSCF,this paper proposes an adaptive estimator based on scaling immersion and invariance(I&I),which reduces the computational complexity while improving the performance of the parameter ***,a barrier Lyapunov function(BLF)is applied to satisfy both the boundedness of the system states and the singularity avoidance of the *** is proved that the estimator error becomes sufficiently small to converge to a specified attractive invariant manifold and the closed-loop SSCF system can obtain asymptotic stability under full-state ***,numerical simulations are performed for comparison and analysis to verify the effectiveness and superiority of the proposed method.

关键词： dynamic scaling full-state constraints input faulttolerance non-CE adaptive control satellite swarm

维普期刊数据库

Model-based system configuration approach for Internetware

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2013年第8期56卷 21-40页

作者： LI Ying SUN KeWei YANG Jie LIU TianCheng ZENG LiangZhao IBM Research-China National Engineering Research Center for Software Engineering Peking University IBM Thomas J.Watson Research Center

Internetware,a new software paradigm,enables systems to be built and evolved for better service quality according to changes in the ***,at the same time Internetware greatly complicates system management tasks due to the autonomy,cooperation and evolution of its *** fact,the configuration of large-scale Internet-based software in the real scenarios is likely to involve a large number of components and hundreds of associated configuration options with variables,whose values may be dynamically determined depending on the execution environment,or to cope with needs of *** this paper,we firstly analyze the configuration issues of Internetware,and then present a model-based engineering approach to managing the configuration for Internetware *** on the Architecture Based Composition model,an internetware configuration process model is proposed that abstracts the configuration in the lifecycle of *** on the fundamental activities in configuration process,the methods and mechanisms of analyzing and performing the configuration in terms of its constraints,dependencies,heterogeneity and dynamics,with supporting tools to realize the configuration automation,are *** proposed methods and mechanisms have been implemented,validated and rolled out in IBM software products and Cloud center.

关键词： Internetware system configuration model-based dynamic scaling

A singular perturbation based approach for systems with nonlinear input uncertainties

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

A singular perturbation based approach for systems with nonl...