Results 131 to 140 of about 25,497 (306)

Review of Recent Trends in Sensing Methodologies and AI Techniques for Non-Cooperative Aerial Target Recognition [PDF]

International Journal of Mathematical, Engineering and Management Sciences
The proliferation of non-cooperative aerial targets, particularly low altitude-slow-speed small RCS drones, presents a complex challenge for airspace security.
Arvind Rawat , Abhinav Sharma, Abhishek Kumar Awasthi , Abhishek Sharma , Sew Sun Tiang, Wei Hong Lim   +5 more
doaj   +1 more source

3D Surface Profiling via Direct End‐to‐End Regression With a Photonic Geometric Sensor

Laser &Photonics Reviews, EarlyView.
Measurements of microscale surface patterns are essential for quality control across semiconductor and biomedical industries, yet the development of miniaturized, intelligent systems remains constrained by the complexity and bulkiness of conventional benchtop metrology.
Ziyao Zhang, Yizhi Wang, Chunhui Yao, Huiyu Huang, Rui Ma, Xin Du, Wanlu Zhang, Zhitian Shi, Minjia Chen, Ting Yan, Liang Ming, Yuxiao Ye, Richard Penty, Qixiang Cheng   +13 more
wiley   +1 more source

Ultrahigh-resolution ISAR Micro-Doppler Suppression Methodology Based on Variational Mode Decomposition and Mode Optimization

Leida xuebao
The imaging of aerial targets using Inverse Synthetic Aperture Radar (ISAR) is affected by micro-Doppler effects resulting from localized micromotions, such as rotation and vibration.
Zhongyu LI, Liang GUI, Yu HAI, Junjie WU, Dangwei WANG, Anle WANG, Jianyu YANG   +6 more
doaj   +1 more source

Classification of UAV-to-Ground Vehicles Based on Micro-Doppler Signatures Using Singular Value Decomposition and Deep Convolutional Neural Networks

IEEE Access, 2019
Attack from the unmanned aerial vehicles (UAVs) has been the main means of high-precision strike. Therefore, classifying ground vehicles from the UAV with high accuracy is of great significance.
Lingzhi Zhu, Shuning Zhang, Huichang Zhao, Si Chen, Dongxu Wei, Xiangyu Lu   +5 more
doaj   +1 more source

Optical Coherence Tomography for High‐Precision Industrial Inspection in Industry 4.0: Advances, Challenges, and Future Trends

Laser &Photonics Reviews, EarlyView.
This review examines how optical coherence tomography transforms industrial inspection by delivering real‐time, micrometer‐resolution, depth‐resolved imaging. It surveys applications across display manufacturing, thin films, microelectronics, laser processing, and coatings, evaluates performance against conventional techniques, and highlights emerging ...
Nipun Shantha Kahatapitiya, Sm Abu Saleah, Daewoon Seong, Naresh Kumar Ravichandran, Sangyeob Han, Ruchire Eranga Wijesinghe, Mansik Jeon, Jeehyun Kim   +7 more
wiley   +1 more source

Engineered Gravel Trench Hyporheic Exchange to Create Cold‐Water Thermal Refuges

River Research and Applications, EarlyView.
ABSTRACT Warming rivers are driving a loss or fragmentation of cold‐water habitat and providing the impetus to develop proactive thermal management approaches to maintain suitable habitat in rivers. One innovative approach is through the creation of cold‐water thermal refuges during periods of thermal stress for aquatic species.
Kathryn A. Smith, Edmund A. Halfyard, Christa Kelleher, Barret L. Kurylyk   +3 more
wiley   +1 more source

Sonar micro-Doppler effect induced by ship oscillatory motion in waves: Phenomenon, model, and experimentation [PDF]

JASA Express Letters
Traditional research attributes the modulated sidebands of ship radiation line-spectrum signals to reflections off rough ocean surfaces, but the Doppler effect caused by vessel motion may also contribute.
Minhao Wang, Cuie Zheng, Dajun Sun, Jian Xu   +3 more
doaj   +1 more source

Micro-Doppler Signature Detection and Recognition of UAVs Based on OMP Algorithm. [PDF]

Sensors (Basel), 2023
Fan S, Wu Z, Xu W, Zhu J, Tu G.
europepmc   +1 more source

Advances in research on impulse hydro‐turbine technology

River, EarlyView.
Abstract To accelerate the development of impulse hydro‐turbines and support the efficient utilization of hydropower resources in Southwest China, this paper examines the background, historical development, and research progress of impulse hydro‐turbines.
Xiaochao Li, Ye Zhou, Hao Zhang, Guanglei Xiao, Yanwei Li, Zhongxin Gao, Zhiyang Lu, Shangqi Li   +7 more
wiley   +1 more source

DeepActivity: a micro-Doppler spectrogram-based net for human behaviour recognition in bio-radar

The Journal of Engineering, 2019
The movements of the human body and limbs result in unique micro-Doppler signatures, which can be exploited for classifying human activities. In this work, the authors propose a Convolutional Gated Recurrent Units Neural Network (CNN-GRU) to classify ...
Hao Du, Tian Jin, Yongping Song, Yongpeng Dai   +3 more
doaj   +1 more source