Results 81 to 90 of about 2,647 (197)

Metasurface‐Enabled Active‐Like Passive Radar

Advanced Science, Volume 13, Issue 44, 7 August 2026.
A programmable space‐time‐coding metasurface embeds distinct spatiotemporal tags into ambient wireless signals, allowing passive radar to operate in an active‐like manner. By enabling code‐correlated reconstruction under interference, the approach supports robust real‐time UAV tracking in complex environments and points to intelligent, low‐power ...
Mingyi Li, Jiawen Xu, Hanting Zhao, Xu Zhao, Yanjin Chen, Tie Jun Cui, Vincenzo Galdi, Lianlin Li   +7 more
wiley   +1 more source

Imidazole‐Extended Non‐Fullerene Acceptors With Tunable Crystallinity for Ultrasensitive, Ultrafast Near‐Infrared Organic Photodetectors

Aggregate, Volume 7, Issue 8, August 2026.
A two‐dimensional extended imidazole acceptor‐based organic photodetector delivers a lower dark current of 2.54 × 10−12 A/cm−2, peak detectivity of 1.08 × 1013 Jones, the widest linear dynamic range of 167.8 dB, and ultrafast response times of 307/319 ns. ABSTRACT Emerging optoelectronic tasks such as night‐vision imaging and wearable health monitoring
Chengwei Shan, Zihao Li, Han Gao, Yuang Fu, Zhaojin Wang, Xinhui Lu, Xianyong Zhou, Bin‐Bin Yu, Philip C. Y. Chow, Aung Ko Ko Kyaw, Chang Liu, Tianshuo Zhao, Hanjian Lai   +12 more
wiley   +1 more source

Interpreting How Neural Networks Infer Scatterer Geometry from Echolocation Echoes

Advanced Intelligent Systems, Volume 8, Issue 8, August 2026.
Neural networks enable echolocation‐based shape classification but remain difficult to interpret due to their black‐box nature. This work presents a feature‐importance metric to uncover the echo regions driving decisions in shape‐specialized networks.
Ganesh U. Patil, Hyung‐Suk Kwon, Bogdan‐Ioan Popa   +2 more
wiley   +1 more source

A Sliding Time‐Window Energy Ratio Method for Weak Signal Enhancement of Deep Subgrade Voids in GPR Data

Applied Research, Volume 5, Issue 4, August 2026.
A sliding time‐window energy ratio method is proposed to enhance weak GPR reflections from deep pavement voids. By combining target‐window localization with same‐window normalization, STWER suppresses non‐target interference and improves defect localization, as demonstrated by numerical simulations and field cases verified by excavation and core ...
Zhengnan Liu, Wanli Chao, Qishun Wang, Yuan Liu, Xiang Qiu   +4 more
wiley   +1 more source

A primer on forest structure measurement with lidar for ecologists

Ecosphere, Volume 17, Issue 8, August 2026.
Abstract Light detection and ranging (lidar) technology has fundamentally advanced the way we measure forest structure, facilitating new insights into ecological processes. Lidar for forest ecology applications is deployed on multiple types of platforms that operate from the ground, air, or space, and each has associated strengths and limitations ...
K. C. Cushman, Kamil Král, Angelica M. Almeyda Zambrano, Eben N. Broadbent, Martin Krůček, Alice Rosen, Sean M. McMahon   +6 more
wiley   +1 more source

Biodegradable, Biologically Safe Nanogenerators for Self‐Powered Bio‐Integrated Systems

Small Structures, Volume 7, Issue 8, August 2026.
Biodegradable TENGs, PENGs, and hybrid systems convert biomechanical motions into electrical signals while safely degrading after use. This review highlights their working mechanisms, biodegradable material platforms, and wearable and implantable bio‐integrated applications, including motion and respiration monitoring, biosignal detection, electrical ...
Sungkeun Han, Hye‐Min Lee, Won Bae Han, Venkata Ramesh Naganaboina, Hanjun Ryu, Suk-Won Hwang   +5 more
wiley   +1 more source

A Detection and Cover Integrated Waveform Design Method with Good Correlation Characteristics and Doppler Tolerance

Remote Sensing
With the increasing complexity of the electromagnetic environment, radar waveform design needs to break through the limitation of traditional single-function architectures, prompting the emergence of integrated radar waveforms.
Haoting Guo, Fulai Wang, Nanjun Li, Zezhou Wu, Chen Pang, Lei Zhang, Yongzhen Li   +6 more
doaj   +1 more source

Imaging Near‐Surface Bedrock Fracturing and Fluid Pathways Using Seismic Attenuation and Velocity From Viscoacoustic Full‐Waveform Inversion of Refraction Data

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 8, August 2026.
Abstract Seismic attenuation provides sensitivity to fracture density, fluid saturation, and pore geometry that complements velocity, enabling quantitative imaging of fracture architecture and associated fluid‐pathways in near‐surface bedrock. Yet high‐resolution attenuation models remain rare in refraction studies due to amplitude‐fidelity and ...
Donggeon Kim, Guangchi Xing, Tieyuan Zhu
wiley   +1 more source

Research on Optimization Design Method of MIMO Radar Waveform Based on Frequency-Orthogonal LFM

IEEE Access
In the field of Multiple Input Multiple Output(MIMO) radar waveform design, how to design an orthogonal waveform with high performance is one of the current hot topics. The Orthogonal Frequency Division Multiplexing - Linear Frequency Modulation(OFDM-LFM)
Xinrong Mao, Baiyang Cai, Meng Xia, Lichao Yang   +3 more
doaj   +1 more source

Bayesian Inference of Fault Slip Heterogeneity and Overlap: Application to 2019 Ridgecrest Earthquakes and Afterslip

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 8, August 2026.
Abstract Fault slip occurs in both seismic and aseismic styles with spatial variability across scales, yet non‐unique source inference limits our ability to resolve slip complexity and dynamics. Here we evaluate the effect of spatial smoothing regularization in Bayesian frameworks by comparing an unregularized (BUR) approach that samples distributed ...
Xiong Zhao, Junle Jiang
wiley   +1 more source