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Fabrication of Porous Bulk Metallic Glass

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Journal of Materials Science & Technology 2005年第6期21卷 788-790页

作者： Keqiang QIU+ and Yinglei REN school of Materials Science and engineering, shenyang university of Technology, shenyang 110023, China school of Materials Science and engineering Shenyang University of Technology Shenyang 110023 China

An open-cell porous bulk metallic glass （BMG） with a diameter of at least 6 mm was fabricated by using an U-turn quartz tube and infiltration casting around soluble NaCI placeholders. The pore formation and glassy structure were examined by optical microscopy （OM）, scanning electron microscopy （SEM） and X-ray diffraction （XRD）. The results show that the pores or cells are connected to each other and the specimen is composed of a mostly glassy phase. This paper provides a suitable method for fabrication of porous BMG and BMG with larger size in diameter.

关键词： Porous bulk metallic glass U-turn quartz tube Infiltration casting

A routing algorithm based on clusters and balanced use of energy for wireless sensor networks

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控制理论与应用（英文版） 2010年第1期8卷 81-85页

作者： Liang ZHANG,Xiangdong WANG,Shujiang LI(school of information Science and engineering,shenyang university of Technology,shenyang Liaoning 110178,China) school of information Science and engineering Shenyang University of Technology Shenyang Liaoning China

In a sensor network, data collected by different sensors are often correlated because they are observations of related phenomena. Efficient sensor data fusion is one of the most important issues in building real sensor networks. To balance energy cost, how to select a cluster head is a key problem that must be addressed. In this paper, we use a compression-centric data collection algorithm for use in wireless sensor networks. Also, we propose a balanced cluster head selection algorithm in each cluster. Simulation results are used to investigate the performance of the algorithm. Compared to the exhaustive search solutions, the proposed algorithm shows a significant improvement in power consumption.

关键词： Sensor networks Cluster Sink node Power consumption

Adaptive synchronization of neural networks with different attractors

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Progress in Natural Science:Materials International 2007年第6期17卷 687-695页

作者： Zhang Huaguang1, Guan Huanxin1 and Wang Zhanshan1,2.1. school of information Science and engineering, Northeastern university, shenyang 110004, China 2. school of information Science and engineering, shenyang Ligong university, shenyang 110168, China) school of information Science and engineering Northeastern University Shenyang 110004 China school of information Science and engineering Shenyang Ligong University Shenyang 110168 China

This paper aims to present an adaptive control scheme for the synchronization of two classes of uncertain neural networks with different attractors. A new sufficient condition for the global synchronization of two kinds of neural networks with different attractors is derived. The proposed control method is efficient and easy to be implemented. Numerical simulation is used to show the effectiveness of the obtained result.

关键词： neural networks attractor adaptive synchronization linear matrix inequality.

Global asymptotic stability of cellular neural networks with multiple delays

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Progress in Natural Science:Materials International 2006年第2期16卷 163-168页

作者： WANG Zhanshan and ZHANG Huaguang ( Key Laboratory of Process Industry Automation, Northeastern university, shenyang 110004, China Department of information engineering, shenyang Ligong university, shenyang 110168, China) Key Laboratory of Process Industry Automation Northeastern University Shenyang 110004 China Department of information engineering Shenyang Ligong University Shenyang 110168 China

Global asymptotic stability (GAS) is discussed for cellular neural networks (CNN) with multiple time delays. Several criteria are proposed to ascertain the uniqueness and global asymptotic stability of the equilibrium point for the CNN with delays. These criteria can eliminate the difference between the neuronal excitatory and inhibitory effects. Two examples are presented to demonstrate the effectiveness of the criteria.

关键词： cellular neural networks global asymptotic stability multiple time delays.

H∞ control for uncertain Markovian jump systems with mode-dependent mixed delays

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Progress in Natural Science:Materials International 2008年第3期18卷 309-314页

作者： Yingchun Wang, Huaguang Zhang school of information Science and engineering, Northeastern university, shenyang 110004, China school of information Science and engineering Northeastern University Shenyang 110004 China

We study the problem of H∞control for a class of Markovian jump systems with norm-bounded parameter uncertainties and mode- dependent mixed delays including discrete delays and distributed delays in this paper. Our aim is to present a new delay-dependent con- trol approach such that the resulting closed-loop system is robust mean-square (MS) exponentially stable and satisfies a prescribed H∞performance level, irrespective of the parameter uncertainties. Such delay-dependent approach does not require system transformation or free-weighting matrix. A numerical example shows that the results are less conservative and more effective.

关键词： H1 control Markovian jump Mixed delays Delay-dependent criterion

Particle swarm optimization with a leader and followers

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Progress in Natural Science:Materials International 2008年第11期18卷 1437-1443页

作者： Junwei Wang Dingwei Wang Institute of Systems engineering,College of information Science and engineering,Northeastern university,shenyang 110004,China Institute of Systems engineering College of Information Science and Engineering Northeastern University Shenyang 110004 China

Referring to the flight mechanism of wild goose flock,we propose a novel version of Particle Swarm Optimization(PSO)with a leader and *** is referred to as Goose Team Optimization(GTO).The basic features of goose team flight such as goose role division, parallel principle,aggregate principle and separate principle are implemented in the recommended *** GTO,a team is formed by the particles with a leader and some *** role of the leader is to determine the search *** followers decide their flying modes according to their distances to the leader ***,a wide area can be explored and the particle collision can be really *** GTO is applied to four benchmark examples of complex nonlinear functions,it has a better computation perfor- mance than the standard PSO.

关键词： Particle swarm optimization Goose team optimization Role division Parallel principle Aggregate principle Separate principle

Influence of temperature rate on transitory internal friction during reverse martensitic transformation for Ti_(50)Ni_(27)Cu_(23) alloy

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Rare Metals 2010年第3期29卷 308-311页

作者： LI Yonghua,QI Guangxia,WANG Zhongtang,LI Yuhai,and DENG Ziyu school of Materials Science and engineering,shenyang Ligong university,shenyang 110159,China school of Materials Science and engineering Shenyang Ligong University Shenyang China

Internal friction （IF） spectra during reverse martensitic transformation from 35 to 135°C at different temperature rates of 0.5,0.75,and 1°C/min for Ti50Ni27Cu23 shape memory alloy （SMA） samples were measured with a dynamic mechanical analyzer,*** IF spectra were characterized by IF peak increasing progressively and peak shifting toward high temperature with an increase in temperature *** iterative approach was used to calculate the precise intrinsic and approximate transitory IF contributions to the normal IF *** quantitatively analyzed results indicate that the transitory IF of this alloy is nonlinearly dependent on the temperature rate and obeys a power law with a power coefficient of *** predicted and experimental IF spectra at different temperature rates of 0.75 and 1°C/min agree well with each other,respectively.

关键词： internal friction shape memory alloy TiNiCu alloy temperature rate reverse martensitic transformation

Delay-probability-distribution-dependent robust stability analysis for stochastic neural networks with time-varying delay

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Progress in Natural Science:Materials International 2009年第10期19卷 1333-1340页

作者： Jie Fu,Huaguang Zhang,Tiedong Ma school of information Science and engineering,Northeastern university,Box 134,shenyang 110004,China school of information Science and engineering Northeastern University Box 134 Shenyang 110004 China

The delay-probability-distribution-dependent robust stability problem for a class of uncertain stochastic neural networks(SNNs) with time-varying delay is *** information of probability distribution of the time delay is considered and transformed into parameter matrices of the transferred SNNs *** on the Lyapunov-Krasovskii functional and stochastic analysis approach,a delay-probability-distribution-dependent sufficient condition is obtained in the linear matrix inequality(LMI) format such that delayed SNNs are robustly globally asymptotically stable in the mean-square sense for all admissible *** important feature of the results is that the stability conditions are dependent on the probability distribution of the delay and upper bound of the delay derivative,and the upper bound is allowed to be greater than or equal to ***,numerical examples are given to illustrate the effectiveness and less conservativeness of the proposed method.

关键词： Delay-probability-distribution-dependent Stochastic neural networks Time-varying delay Linear matrix inequality

Reliability analysis of ship structure system with multi-defects

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Science China(Physics,Mechanics & Astronomy) 2010年第11期53卷 2113-2124页

作者： AN Hai 1,AN WeiGang 1 & ZHAO WeiTao 2.1.school of Aerospace and Civil engineering,Harbin engineering university,Harbin 150001,China 2 school of Aeronautics and Astronautics,shenyang Institute of Aeronautical engineering,shenyang 110034,China school of Aerospace and Civil engineering Harbin Engineering University Harbin China school of Aeronautics and Astronautics Shenyang Institute of Aeronautical Engineering Shenyang China

This paper analyzes the influence of multi-defects including the initial distortions,welding residual stresses,cracks and local dents on the ultimate strength of the plate element,and has worked out expressions of reliability calculation and sensitivity analysis of the plate *** analysis is made for the system with multi-defects plate *** mechanism,failure paths and the calculating approach to global reliability index are also worked *** plate elements with multi-defects fail,the formula of reverse node forces which affect the residual structure is deduced,so are the sensitivity expressions of the system reliability *** ensures calculating accuracy and rationality for reliability analysis,and makes it convenient to find weakness plate elements which affect the reliability of the structure ***,for the validity of the approach proposed,we take the numerical example of a ship cabin to compare and contrast the reliability and the sensitivity analysis of the structure system with multi-defects with those of the structure system with no *** approach has implications for the structure design,rational maintenance and renewing strategy.

关键词： initial distortions welding residual stresses cracks and local defects ultimate strength reverse node forces sensitivity expression reliability analysis