Results 11 to 20 of about 3,839 (263)

Microstructure Design and Performance Optimization of Constant Modulus Pentamode Materials Acoustic Cloak

Crystals, 2022
Underwater acoustic stealth has great scientific research value. According to acoustic coordinate transformation theory, the acoustic stealth cloak based on pentamode materials can realize underwater broadband acoustic stealth.
Ziyin Luo, Qizheng Zhou, Peng Guo
doaj   +1 more source

Ancient Russian Inlaid Spurs from Vasilevschina (Dzyarzhynsk District, Minsk Oblast). Stabilization, Conservation and Exhibition Experience

Археология евразийских степей, 2021
The archaeological exposition is presently being reconstructed at the Institute of History of the National Academy of Sciences of Belarus. A significant portion of the exhibits is composed of iron items discovered during both scheduled and rescue ...
Anastasia V. Kostyukevich
doaj   +1 more source

Rotating Machinery Remaining Useful Life Prediction Scheme Using Deep-Learning-Based Health Indicator and a New RVM

Shock and Vibration, 2021
Remaining useful life (RUL) prediction plays a significant role in developing the condition-based maintenance and improving the reliability and safety of machines.
Gang Zhang, Weige Liang, Bo She, Fuqing Tian   +3 more
doaj   +1 more source

Cooperative multi-target hunting by unmanned surface vehicles based on multi-agent reinforcement learning

Defence Technology, 2023
To solve the problem of multi-target hunting by an unmanned surface vehicle (USV) fleet, a hunting algorithm based on multi-agent reinforcement learning is proposed.
Jiawei Xia, Yasong Luo, Zhikun Liu, Yalun Zhang, Haoran Shi, Zhong Liu   +5 more
doaj   +1 more source

A Spatial Registration Method for Multi-UAVs Based on a Cooperative Platform in a Geodesic Coordinate Information-Free Environment

Applied Sciences, 2023
The satellite navigation system of Unmanned Aerial Vehicles (UAVs) is susceptible to external interference in a complex environment, resulting in the loss of their own geodetic coordinate information. A spatial registration method for multi-UAVs based on
Qiuyang Dai, Faxing Lu, Junfei Xu
doaj   +1 more source

Multi-under-Actuated Unmanned Surface Vessel Coordinated Path Tracking

Sensors, 2020
Multi-under-actuated unmanned surface vehicles (USV) path tracking control is studied and decoupled by virtue of decentralized control. First, an improved integral line-of-sight guidance strategy is put forward and combined with feedback control to ...
Zefang Li, Zhong Liu, Jianqiang Zhang
doaj   +1 more source

Acoustic Scattering Characteristics of Underwater Eight-grid Air-filled Cavity Corner Reflector

水下无人系统学报, 2022
Underwater corner reflectors have a strong acoustic scattering ability and can be used to mark underwater structures and simulate underwater false targets. In accordance with the limitation of the reflection range of a single-grid corner reflector, a new
Zi-chao CHU, Yi LUO, Wu-di WEN
doaj   +1 more source

Equivalent Phase Shift Induced by Longitudinal Temperature Distribution in Pumped DFB Fiber Laser

Photonics
The pump heating effect of DFB fiber laser is normally ignored due to the short length of the laser cavity. However, by fabricating a phase-shifted FBG on high concentration Er-Yb codoped fiber to obtain a 16 mm long DFB fiber laser, the gradient surface
Wen Liu, Hongcan Gu, Su Zhang, Yandong Pang, Gaofei Yao, Hongwei Han, Junbing Huang   +6 more
doaj   +1 more source

A Novel Anti-DRFM Active Jammer Method for Two-Station Netted Radar Based on Extended Kalman Filtering

International Journal of Antennas and Propagation
Active jammers in the form of digital radio frequency memory (DRFM) could produce false targets with a coherence of range and velocity, making it increasingly efficient in interrupting radar systems based on data correlation analysis.
Yasong Luo, Zhaodong Wu, Chengxu Feng, Shengliang Hu   +3 more
doaj   +1 more source

Feasibility and Safety of Somato‐Cognitive Coordination Therapy for Cerebellar Ataxia Following Pediatric Brain Tumor Treatment

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Cerebellar ataxia after pediatric brain tumor treatment can cause persistent gait, balance, and speech impairment, yet no established rehabilitation strategy exists. Somato‐cognitive coordination therapy (SCCT) is a virtual reality–guided intervention designed to promote sensorimotor integration through visually constrained reaching
Masanobu Takeuchi, Takashi Matsuzawa, Jun Yamanishi, Masahiro Yoshitomi, Junji Ikeda, Shin‐Ichi Tsujimoto, Yasuteru Yamaguchi, Norio Shiba, Dhroov Pathare, Ayumi Kato, Masahiko Hara   +10 more
wiley   +1 more source