Results 91 to 100 of about 11,432 (211)

Phenomenological theory of phase transitions in highly piezoelectric perovskites

, 2001
Recently discovered fine structure of the morphotropic phase boundaries in highly piezoelectric mixture compounds PZT, PMN-PT, and PZN-PT demonstrates the importance of highly non-linear interactions in these systems. We show that an adequate Landau-type
A. F. Devonshire, A. F. Devonshire, A. F. Devonshire, A. M. Prokhorov, B. Noheda, B. Noheda, B. Noheda, B. Noheda, D. Vanderbilt, I. A. Sergienko, I. S. Zheludev, J. Kuwata, L. Bellaiche, M. J. Haun, S. Urazhdin, Yu. M. Gufan, Yu. M. Gufan, Yu. M. Gufan, Yu. M. Gufan, Yu. M. Gufan, Z.-G. Ye   +20 more
core   +1 more source

Key Technologies of Underwater Wireless Optical Communication for UUV Swarm Applications

水下无人系统学报
Unmanned undersea vehicle(UUV) swarm cooperation is a core capability for future marine operations, highly dependent on stable and efficient underwater communication technology. Underwater wireless optical communication(UWOC), with its high bandwidth and
Yunzhou ZHU, Xujuan HU, Xiaobo WANG, Yi YANG, Jianlei ZHANG, Fengtao HE   +5 more
doaj   +1 more source

Movement Control in Recovering UUV Based on Two-Stage Discrete T-S Fuzzy Model

Discrete Dynamics in Nature and Society, 2014
A two-stage discrete T-S fuzzy model controller, which is formed by a motion controller and a dynamic controller connected in series, is presented to solve UUV (unmanned underwater vehicle) movement control problem for recovering.
Zheping Yan, Bing Hao, Yibo Liu, Shuping Hou   +3 more
doaj   +1 more source

Trajectory planning of UUV-assisted UWOC systems based on DQN

Dianxin kexue, 2023
As a key submarine-based communication platform, unmanned underwater vehicle (UUV) can facilitate underwater wireless optical communication (UWOC).However, fluctuating characteristics of water body, different water qualities, multi-user access present ...
Jiawei HU, Xiaoqian LIU, Xinke TANG, Yuhan DONG   +3 more
doaj  

Path Planning for Unmanned Underwater Vehicle in 3D Space with Obstacles Using Spline-Imperialist Competitive Algorithm and Optimal Interval Type-2 Fuzzy Logic Controller

Latin American Journal of Solids and Structures
In this research, generation of a short and smooth path in three-dimensional space with obstacles for guiding an Unmanned Underwater Vehicle (UUV) without collision is investigated.
Ehsan Zakeri, Said Farahat, Seyed Alireza Moezi, Amin Zare   +3 more
doaj   +1 more source

Kartul mahe- ja tavaviljeluse süsteemide võrdluskatses aastatel 2008-2012 [PDF]

, 2012
Kartul on üheks armastatumaiks kultuuriks nii meil kui maalimas. Kartulit on läbi aegade peetud teiseks „leivaks“ ning tänapäeval ei kujutaks meist keegi ette oma toidulauda, kui sealt puuduks toidukartul.
Eremeev, Viacheslav, Luik, Anne, Tein, Berit   +2 more
core  

A numerical investigation on interaction effects between two underwater vehicles in close proximity

Journal of Ocean Engineering and Science
Underwater vehicles operating in close proximity suffer from significant hydrodynamic interactions, especially when there is a prominent vehicle size disparity.
Zi-Qiang Zheng, Lu Zou, Xuan Wang, Zao-Jian Zou   +3 more
doaj   +1 more source

Research on UUV Obstacle Avoiding Method Based on Recurrent Neural Networks

Complexity, 2019
In this paper, we present an online obstacle avoidance planning method for unmanned underwater vehicle (UUV) based on clockwork recurrent neural network (CW-RNN) and long short-term memory (LSTM), respectively.
Changjian Lin, Hongjian Wang, Jianya Yuan, Dan Yu, Chengfeng Li   +4 more
doaj   +1 more source

3D Obstacle Avoidance Path Planning Algorithm and Software Design for UUV Based on Improved D* Lite-APF

Journal of Marine Science and Engineering
To meet the development requirements of the path planning unit for unmanned underwater vehicles (UUVs), research is conducted on UUV 3D obstacle avoidance path planning algorithms and software design.
Peisen Jin, Wenkui Li, Jinlin Zhan, Chenyang Shan   +3 more
doaj   +1 more source

Path Planning Method for UUV Homing and Docking in Movement Disorders Environment

The Scientific World Journal, 2014
Path planning method for unmanned underwater vehicles (UUV) homing and docking in movement disorders environment is proposed in this paper. Firstly, cost function is proposed for path planning. Then, a novel particle swarm optimization (NPSO) is proposed
Zheping Yan, Chao Deng, Dongnan Chi, Tao Chen, Shuping Hou   +4 more
doaj   +1 more source