Results 51 to 60 of about 993 (170)

Observations and Analysis of a Tornadic Quasi‐Linear Convective System (QLCS) With Bistatic Weather Radar

Geophysical Research Letters, Volume 53, Issue 13, 16 July 2026.
Abstract The deployment of a multistatic radar network in the Oklahoma City metropolitan area in Spring 2024 has allowed for unique observations of several severe weather events. This passive multistatic network operates in conjunction with the operational KTLX WSR‐88D, allowing for synchronous multi‐Doppler analyses. This work presents a case study of
Samuel Emmerson, David Bodine, Patrick Skinner, Robert Palmer, David Schvartzman, Pierre Kirstetter   +5 more
wiley   +1 more source

Cross‐Scale Synergistic Optimization for Miniature Meta‐Liquid Hybrid Zoom Imaging

Nanophotonics, Volume 15, Issue 13, 13 July 2026.
A physically constrained optimization framework links electrowetting liquid lenses and metasurface dispersion engineering to realize a compact visible‐band achromatic zoom imager. By co‐optimizing zoom actuation, meta‐atom manufacturability, and system aberrations, the design achieves 1.5x zoom in a 15.5 mm track and clarifies robustness against ...
Zhuoxuan Fan, Meng Zhang, Zihao Gan, Mengyue Chang, Ce Zhang, Zhaoyang Liu, Jianming Lv, Kunsheng Xing, Zhuoqun Hu, Junbo Yang, Huajie Hong   +10 more
wiley   +1 more source

Minimizing Peak Sidelobe Level in MIMO-SAR Waveform Design Using a 1.5-Entmax Sparse Loss

Remote Sensing
The peak sidelobe level (PSL) of an orthogonal waveform set directly governs the range and azimuth ambiguities of synthetic aperture radar (SAR) images and is therefore a key figure of merit for the imaging quality of multiple-input multiple-output SAR ...
Wentao Li, Shujuan Tang, You Chen, Zhuoluo Wang, Siyi Cheng   +4 more
doaj   +1 more source

Noninvasive Intelligent Brain‐Metasurface System for Real‐Time Electromagnetic Wave Manipulation

Nanophotonics, Volume 15, Issue 13, 13 July 2026.
A noninvasive intelligent brain–computer interface (BCI) is integrated with a reconfigurable metasurface to establish a direct neural‐to electromagnetic transduction pathway for real time, multimodal wave control. By combining convolutional‐neural‐network‐based decoding of motor‐imagery electroencephalography (EEG) signals with threshold‐based ...
Xiao Hai, Ruiyang Shen, Xiaoyi Wang, Guo‐Min Yang   +3 more
wiley   +1 more source

OFDM radar waveform optimization for low grazing angle scenarios using mismatched filter via convex solution

EURASIP Journal on Wireless Communications and Networking
In this paper, a novel approach to design a mismatched filter orthogonal frequency division multiplexing waveform, with the design criteria of peak sidelobe level is presented, which is used in a low grazing angle scenario.
Zohreh Asadsangabi, Reza Mohseni, Sadegh Samadi   +2 more
doaj   +1 more source

A Sibelobe Suppressing Beamformer for Coherent Plane Wave Compounding

Applied Sciences, 2016
Contrast degradation is a critical problem in ultrasound plane wave imaging (PWI) resulting from signals leakage from the sidelobes. An ideal sidelobe reduction method may enhance the contrast without remarkably increasing computational load. To this end,
Wei Guo, Yuanyuan Wang, Jinhua Yu
doaj   +1 more source

Transducers Across Scales and Frequencies: A System‐Level Framework for Multiphysics Integration and Co‐Design

Advanced Materials Technologies, Volume 11, Issue 13, 8 July 2026.
Transducers convert physical signals into electrical and optical representations, yet each mechanism is bounded by intrinsic trade‐offs across bandwidth, sensitivity, speed, and energy. This review maps transduction mechanisms across physical scale and frequency, showing how heterogeneous integration and multiphysics co‐design transform isolated ...
Aolei Xu, Mengyao Xiao, Zhouli Sui, Yinpeng Wang, Daoye Zheng, Yuxin Liu, Luwei Wang, Huajun Liu, Chengkuo Lee   +8 more
wiley   +1 more source

Synthesis of Sparse Arrays Based On CIGA (Convex Improved Genetic Algorithm)

Journal of Microwaves, Optoelectronics and Electromagnetic Applications, 2020
In this paper, a novel hybrid algorithm on beam pattern synthesis of sparse arrays is proposed, which aims at minimizing the peak sidelobe level (PSLL). Sparse arrays can provide higher spatial resolution and relatively lower sidelobe than general arrays,
Jianxiong Li, Shuang Ren, Cuijuan Guo
doaj   +1 more source

Revealing the Transmission Hologram's Refractive Index Profile Stored in a Photohydrogel: A Structural Characterization

Advanced Optical Materials, Volume 14, Issue 25, 3 July 2026.
A theoretical model is developed to visualize three‐dimensional refractive index profiles in transmission holographic gratings. In this work, it is applied to photopolymerizable hydrogels, enabling detailed analysis of the internal structure of recorded holograms and their evolution under different degradation conditions.
Belén Nieto‐Rodríguez, Manuel G. Ramírez, José Carlos García‐Vázquez, Tomás Lloret, Inmaculada Pascual   +4 more
wiley   +1 more source

Subarray partition based on sparse array weighted K‐means clustering

Electronics Letters
This paper introduces the subarray partition based on the sparse array weighted K‐means clustering method, which extends the conventional K‐means clustering method through the inclusion of a weight matrix approach. This matrix is derived by recording the
Jiayu Zhao, Jianming Huang, Yansong Cui, Naibo Zhang, Yuxuan Wang, Zilai Wang   +5 more
doaj   +1 more source