检索结果-南通市图书馆

Noncompact 4-manifolds with Uniformly Positive Isotropic Curvature

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2015年第9期31卷 1391-1414页

作者： liang ming SHEN Department of Mathematics Princeton University

In this paper, we study Ricci flow on noncompact 4-manifolds with uniformly positive isotropic curvature and with no essential imcompressible space form. That means there is positive lower bound of isotropic curvature... 详细信息

关键词： Ricci flow surgery isotropic curvature

Relaxation of Magnetic Nanoparticle Chain without Applied Field

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2011年第3期55卷 537-540页

作者： HE liang-ming College of Physics and Electronic Engineering Guangxi University for Nationalities Nanning 530006 China

The relaxation of a one-dimensional magnetic nanoparticle linear chain with lattice constant a is investigated in absence of applied field. There is an equilibrium state （or steady state） where a11 magnetic moments of particles lie along the chain （x-axis）, back to which the magnetic nanoparticle chain at other state will relax. It is found that the relaxation time T= is determined by Tx = 10β×α3. This relaxation is compared with that of single magnetic nanoparticle system.

关键词： magnetic properties of nanostructures

Double resonance in star networks of bistable units with disordered signals

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 2020年第5期72卷 98-104页

作者： Yang Ge Xiao-ming liang School of Physics and Electronic Engineering Jiangsu Normal UniversityXuzhou 221116China

It has been found that a hub node is better able to amplify weak external signals than leaf nodes in star *** hub-enhanced amplification is only attained by a single hub node and is limited to weak coupling *** show here that random initial phases in external weak signals do not affect the hub-enhanced amplification at weak coupling ***,they can improve the responses of all the leaf nodes to external signals at large coupling strength,resulting in a double resonance-like signal *** use a reduced model to analyze the influence of the star structure and random initial phases on the emergence of double resonance.

关键词： signal amplification random initial phases star networks bistable units

Safe semi-supervised learning: a brief introduction

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2019年第4期13卷 669-676页

作者： Yu-Feng LI De-ming liang National Key Laboratory for Novel Software Technology Nanjing University Nanjing 210023 China Collaborative Innovation Center of Novel Software Technology and Industrialization Nanjing 210023 China

Semi-supervised learning constructs the predictive model by learning from a few labeled training examples and a large pool of unlabeled ones. It has a wide range of application scenarios and has attracted much attention in the past decades. However, it is noteworthy that although the learning performance is expected to be improved by exploiting unlabeled data, some empirical studies show that there are situations where the use of unlabeled data may degenerate the performance. Thus, it is advisable to be able to exploit unlabeled data safely. This article reviews some research progress of safe semi-supervised learning, focusing on three types of safeness issue: data quality, where the training data is risky or of low?quality;model uncertainty, where the learning algorithm fails to handle the uncertainty during training;measure diversity, where the safe performance could be adapted to diverse measures.

关键词： machine learning semi-supervised learning safe

STUDY AND APPLICATION OF STEADY FLOW AND UNSTEADY FLOW MATHEMATICAL MODEL FOR CHANNEL NETWORKS

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

Journal of Hydrodynamics 2007年第5期19卷 572-578页

作者： ZHANG ming-liang SHEN Yong-ming State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116024 China

Based on the Preissmann implicit scheme for the one-dimensional Saint-Venant equation, the mathematical model for one-dimensional fiver networks and canal networks was developed and the key issues on the model were expatiated particularly in this article. This model applies the method of three-steps solution for chaunel-junction-channel to simulate the river networks, and the Gauss elimination method was used to calculate the sparse matrix. This model was applied to simulate the tree-type irrigation canal networks, complex looped channel networks and the Lower Columbia Slough networks. The results of water level and discharge agree with the data from the Adlul and field data. The model is proved to be robust for simulating unsteady flows in river networks with various degrees of complex structure. The calculated results show that this model is useful for engineering applications in complicated river networks. Future research was recommended to focus on setting up ecological numerical model of water quality in river networks and canal networks.

关键词： Preissmann implicit scheme canal networks and river networks unsteady flow ecological numerical model

Quantum coherence of multiqubit states in correlated noisy channels

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2020年第3期63卷 116-119页

作者： ming-liang Hu Heng Fan School of Science Xi’an University of Posts and TelecommunicationsXi’an 710121China Institute of Physics Chinese Academy of SciencesBeijing 100190China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

Quantum coherence captures the essential nature of a quantum system[1]and can serve as a resource for quantum information processing[2].Recent studies also provide evidence that long-lived quantum coherence is crucial for overcoming the classical limits of measurement accuracy in quantum metrology[3-5].However,in practice,the unavoidable interaction of a principal system with its surroundings results in decoherence in most ***,the advantage of quantum coherence in empowering the performance of quantum tasks will disappear in a very short time interval,which remains one of the major obstacles in its potential application.

关键词： quantum system disappear

Liquid-Gas Phase Transition for Asymmetric Nuclear Matter in the Zimanyi-Moszkowski Model

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2004年第7期21卷 1240-1242页

作者： ZHANGXu-ming QIANWei-liang SURu-Keng DepartmentofPhysics FudanUniversityShanghai200433

By using the improved Zimanyi-Moszkowski (ZM) model including the freedom of nucleons, σ mesons, ω mesons and ρ mesons, we investigate the liquid-gas phase transition for asymmetric nuclear matter. It is found that the phase transition for asymmetric nuclear matter in the improved ZM model with the isospin vector ρ meson degree of freedom is well defined. The binodal surface, which is essential in the study of the phase transition process, is addressed.

关键词： Nuclear physics Particle physics and field theory

Limits on sequential sharing of nonlocal advantage of quantum coherence

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

Science China(Physics,Mechanics & Astronomy) 2022年第6期65卷 26-35页

作者： ming-liang Hu Jia-Ru Wang Heng Fan School of Science Xi’an University of Posts and TelecommunicationsXi’an 710121China Institute of Physics Chinese Academy of SciencesBeijing 100190China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

Sequential sharing of nonlocal correlation is inherently related to its *** address the question as to how many observers can share the nonlocal advantage of quantum coherence(NAQC)in a(d×d)-dimensional state,where d is a prime or a power of a *** first analyze the trade-off between disturbance and information gain of the general d-dimensional unsharp *** in a scenario where multiple Alices perform unsharp measurements on one party of the state sequentially and independently and a single Bob measures coherence of the conditional states on the other party,we show that at most one Alice can demonstrate NAQC with *** limit holds even when considering the weak measurements with optimal pointer *** results may shed light on the interplay between nonlocal correlations and quantum measurements on high-dimensional systems and the hierarchy of different quantum correlations.

关键词： quantum coherence quantum correlation unsharp measurement

同方期刊数据库

Fuzzy Q-learning in continuous state and action space

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2010年第4期17卷 100-109页

作者： XU ming-liang XU Wen-bo Department of Electronic Information Engineering Wuxi City College of Vocational Technology Wuxi 214063 China School of Information Technology Jiangnan University Wuxi 214122 China

An adaptive fuzzy Q-leaming （AFQL） based on fuzzy inference systems （FIS） is proposed. The FIS realized by a normalized radial basis function （NRBF） neural network is used to approach Q-value function, whose input is composed of state and action. The rules of FIS are created incrementally according to the novelty of each element of the pair of state-action. Moreover the premise part and consequent part of the FIS are updated using extended Kalman filter （EKF）. The action that impacts on environment is the one with maximum output of FIS in the current state and generated through optimization method. Simulation results in the wall-following task of mobile robots and the inverted pendulum balancing problem demonstrate that the superiority and applicability of the proposed AFQL method.

关键词： Q-learning FIS continuous adaptation