Stealth and equiluminous materials for scattering cancellation and wave diffusion

AbstractIn this paper, the multi-term time-fractional wave-diffusion equations are considered. The multi-term time fractional derivatives are defined in the Caputo sense, whose orders belong to the intervals [0,1], [1,2), [0,2), [0,3), [2,3) and [2,4), respectively. Some computationally effective numerical methods are proposed for simulating the multi-term time-fractional wave-diffusion equations. The numerical results demonstrate the effectiveness of theoretical analysis. These methods and techniques can also be extended to other kinds of the multi-term fractional time-space models with fractional Laplacian.

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Wave diffusion geotomography approach to providing subsurface images of mining environment

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts ◽

10.1016/0148-9062(92)91285-d ◽

1992 ◽

Vol 29 (1) ◽

pp. A30

Keyword(s):

Mining Environment ◽

Wave Diffusion

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Influential Nodes in a One-Wave Diffusion Model for Location-Based Social Networks

Advances in Knowledge Discovery and Data Mining - Lecture Notes in Computer Science ◽

10.1007/978-3-642-37456-2_6 ◽

2013 ◽

pp. 61-72 ◽

Cited By ~ 6

Author(s):

Hao-Hsiang Wu ◽

Mi-Yen Yeh

Keyword(s):

Social Networks ◽

Diffusion Model ◽

Influential Nodes ◽

Wave Diffusion ◽

Location Based Social Networks

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Non-existence of Global Solutions for a Fractional Wave-diffusion Equations

Journal of Partial Differential Equations ◽

10.4208/jpde.v25.n1.1 ◽

2012 ◽

Vol 25 (1) ◽

pp. 1-20 ◽

Cited By ~ 1

Author(s):

Berbiche Mohamed and Hakem Ali

Keyword(s):

Global Solutions ◽

Diffusion Equations ◽

Wave Diffusion

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Multi-autonomous underwater vehicles collaboratively search for intelligent targets in an unknown environment in the presence of interception

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/0954406220943621 ◽

2020 ◽

pp. 095440622094362

Author(s):

Xi-wen Ma ◽

Yan-li Chen ◽

Gui-qiang Bai ◽

Yong-bai Sha ◽

Jun Liu

Keyword(s):

Autonomous Underwater Vehicle ◽

Autonomous Underwater Vehicles ◽

Full Range ◽

Underwater Vehicle ◽

Underwater Vehicles ◽

Layer By Layer ◽

Self Organizing Map ◽

Unknown Environment ◽

Underwater Environment ◽

Wave Diffusion

We present a bionic neural wave network that uses multiple autonomous underwater vehicles to search and acquire intelligent targets in an unknown underwater environment. The neuron pheromone content is arranged according to neural wave diffusion and layer-by-layer energy attenuation, when underwater mesh space based on neural wave diffusion theory was established that the neuron nodes in the neural network structure correspond to obstacles, autonomous underwater vehicles, and targets in the environment. In order to solve the problems of over-allocation and under-allocation of the multi-autonomous underwater vehicles system during the cooperative capture of targets, a redistribution mechanism based on the improved self-organizing map algorithm is implemented and directed to rationalize task distribution. Two different taboo search methods are employed to update the autonomous underwater vehicle path in real time, and the polynomial coefficient solution method is used to fit partial path data. So that the autonomous underwater vehicle trajectory can be obtained and an interceptor position coordinate can be predicted. An auxiliary autonomous underwater vehicle is aimed to replace the intercepted autonomous underwater vehicle and the matching capture points are tracked to ensure the completion of the task so that the full range of hunting targets is identified. In order to simulate an unknown complex underwater environment, obstacles are randomly arranged around the target, the location information of the obstacle, and the target is unknown and unpredictable. Four simulation experiments were performed to verify the accuracy and efficiency of the algorithm under unknown environment. The results show that this algorithm can improve the path update average efficiency by 66% compared with other algorithms. Obviously, this algorithm is reasonable and effective.

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