Results 61 to 70 of about 641,941 (183)

Forward-looking Multi-channel SAR Adaptive Identification to Suppress Deception Jamming

Leida xuebao, 2019
Forward-looking multi-channel SAR imaging suffers from ambiguity regarding left and right echoes. To deblur the imaging process, spatial resources must be used, which make the imaging process more complex than the general side-looking SAR.
MENG Zhichao, LU Jingyue, ZHANG Lei
doaj   +1 more source

Four Decades of Research at the MADE Site and Beyond: Advancing the Understanding and Modeling of Solute Transport in Heterogeneous Media

Reviews of Geophysics, Volume 64, Issue 4, December 2026.
Abstract Spatial heterogeneity, manifested as strong variability in hydraulic conductivity (K) within geological formations, exerts a fundamental control on groundwater flow and solute transport. Because K can vary over multiple orders of magnitude in complex three‐dimensional patterns, predicting contaminant plume migration remains a long‐standing ...
Zhilin Guo, Maosheng Yin, Peiyao Dong, Yong Zhang, Kewei Chen, Graham Fogg, Brian Berkowitz, Marco Dentz, Chunmiao Zheng   +8 more
wiley   +1 more source

Quadratic Frequency Modulation Signals Parameter Estimation Based on Product High Order Ambiguity Function-Modified Integrated Cubic Phase Function

Information, 2019
In inverse synthetic aperture radar (ISAR) imaging system for targets with complex motion, such as ships fluctuating with oceanic waves and high maneuvering airplanes, the multi-component quadratic frequency modulation (QFM) signals are more suitable ...
Lei Zhu
doaj   +1 more source

Cross‐scale Material‐Structure Synergy for 2D Metamaterials: Toward Customizable Intelligent Electromagnetic Manipulation in Multiphysics Fields

Advanced Science, Volume 13, Issue 58, 19 October 2026.
Recent advances in metasurface‐enabled low‐observable technologies are reviewed from the perspective of cross‐scale material–structure synergy. Electromagnetic, thermal, optical, and acoustic stealth are highlighted together with dynamic tuning, programmable coding, data‐driven inverse design, artificial intelligence, multispectral compatibility, and ...
Shuhao Wang, Xing Yang, Liping Liu, Yang Peng, Yangyang Wang, Hualiang Lv   +5 more
wiley   +1 more source

Vascular drivers of cerebrospinal fluid movement and enlarged perivascular spaces

Alzheimer's &Dementia, Volume 22, Issue 10, October 2026.
Abstract Perivascular spaces (PVSs) facilitate cerebrospinal fluid flow and waste clearance, which are critical for maintaining brain homeostasis. Enlarged PVSs (ePVSs) are an emerging marker of cerebral small vessel disease and are implicated in protein accumulation, neurodegeneration, and cognitive decline.
James D. LeFevre, Yukti Vyas, Angela L. Jefferson   +2 more
wiley   +1 more source

A Novel Weighted Amplitude Modulation (WAM) System for Ambiguity Suppression of Spaceborne Hybrid Quad-Pol SAR

, 2021
Quadrature-polarimetric synthetic aperture radar (quad-pol SAR) has extensive applications, including climate zones classification, extraction of surface roughness, soil moisture mapping, moving target indication, and rice mapping.
Yongwei Zhang, Sheng Chang, Robert Wang, Peng Li, Yanyan Zhang, Yunkai Deng   +5 more
core   +1 more source

Mitigation of Suppressive Interference in AMPC SAR Based on Digital Beamforming

Remote Sensing
Multichannel Synthetic Aperture Radar (MC-SAR) systems, such as Azimuth Multi-Phase Centre (AMPC) SAR, provide an effective solution for achieving high-resolution wide-swath (HRWS) imaging by reducing the pulse repetition frequency (PRF) to increase the ...
Zhipeng Xiao, Feng He, Zaoyu Sun, Zehua Zhang   +3 more
doaj   +1 more source

Grating‐Lens Empowered Metafiber for Large‐Angle Light Collection With 3D Nanoprinted Structures

Laser &Photonics Reviews, Volume 20, Issue 20, 21 October 2026.
A grating‐lens‐based Metafiber enables efficient light coupling into single‐mode fibers at large incidence angles. By combining diffraction and focusing on the fiber facet using a 3D nanoprinted holographic structure, light is selectively coupled only at specific angles while suppressing unwanted signals. This approach achieves high coupling efficiency
Jun Sun, Markus A. Schmidt
wiley   +1 more source

Femtosecond‐Laser‐Inscribed Cladding Fiber Bragg Gratings: Architectures, Design Trade‐Offs and Future Sensing Opportunities

Laser &Photonics Reviews, Volume 20, Issue 19, 7 October 2026.
Femtosecond‐laser inscription enables precise positioning of fiber Bragg gratings within the cladding, introducing new spatial and modal design freedoms. Auxiliary‐waveguide, near‐core evanescent‐field, and direct cladding‐mode‐excitation architectures provide complementary pathways toward multiparameter, vector, distributed, and environmentally ...
Koustav Dey, Rex E. Gerald, Chen Zhu, Jie Huang   +3 more
wiley   +1 more source

Full Waveform Modeling of Bridgmanite Fabric‐Induced Seismic Discontinuities in the Mid‐Mantle: Implications for Double Underside Reflections Beneath Subduction Zones

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 10, October 2026.
Abstract Mid‐mantle (660–2,000 km) seismic observations are commonly attributed to thermo‐chemical heterogeneities or phase transitions, yet many observed features remain difficult to reconcile with these mechanisms alone. It has been shown that the depth‐dependent behavior of bridgmanite deformation generates a strain‐induced seismic discontinuity ...
John Keith Magali, Ye Yuan, Takumi Matsunaga, Christine Thomas   +3 more
wiley   +1 more source