Results 41 to 50 of about 927 (180)

Enhanced Retrieval of Spring Snow Depth Over Pan‐Arctic Sea Ice From AMSR2 Observations for 2013–2023 Using Multi‐Model Machine Learning

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 4, August 2026.
Abstract Snow on sea ice modulates the Earth's radiation budget and sea ice mass balance, yet satellite retrievals of Arctic snow depth remain subject to substantial algorithmic uncertainty. We develop a multi‐model machine learning (ML) framework for retrieving spring snow depth over Arctic sea ice from Advanced Microwave Scanning Radiometer 2 (AMSR2).
Yi Zhou, Chentong Zhang, Alek Petty, Xianwei Wang, Ruibo Lei, Wenxuan Liu, Yu Zhang   +6 more
wiley   +1 more source

Optical Phased Arrays on Photonic Integrated Circuit Platforms: Challenges, Opportunities, and Future Applications

Nanophotonics, Volume 15, Issue 14, 27 July 2026.
Integrated optical phased arrays are emerging as scalable engines for solid‐state beam steering and programmable wavefront control. This Review maps the field from beam‐steering principles and core building blocks to material platforms, system‐level bottlenecks, and application frontiers, highlighting how heterogeneous integration, aperiodic ...
Jingwei Li, Yuyuan Han, Aoxiang Chen, Pengpeng Li, Xinglin Zhu, Guanbao Zhao, Luohan Peng, Huaibin Zheng   +7 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

A Networked Radar Beam Allocation Method for Multi‐Target Tracking in Multi‐Jammer Scenario

IET Radar, Sonar & Navigation
This paper focuses on the problem of mainlobe interference suppression in radar networks tracking multi‐target scenarios with multiple jammers. A beam allocation method is proposed based on stepwise suppression of mainlobe and sidelobe interference ...
Lei Zhang, Linghua Su, Ying Luo, Jianfei Ren, Qun Zhang   +4 more
doaj   +1 more source

A Balanced Feed Filtering Antenna With Novel Coupling Structure for Low-Sidelobe Radar Applications

IEEE Access, 2018
A fourth-order filtering patch antenna with a novel coupling structure is presented in this paper. Using the proposed coupling structure, both the balanced coupling feed and cross-coupling are realized.
Le-Hu Wen, Steven Gao, Qi Luo, Zhaoyang Tang, Wei Hu, Yingzeng Yin, Youlin Geng, Zhiqun Cheng   +7 more
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

Physical-layer security enhancement in cognitive radio networks using whale optimization-based sidelobe suppression

ICT Express
OFDM-based cognitive radio networks suffer from high sidelobe emissions, leading to adjacent interference and potential security vulnerabilities. This paper introduces a Whale Optimization Algorithm (WOA)-based cancellation carrier (CC) approach for ...
Atif Elahi, Noor Gul, Adnan Elahi, Su Min Kim, Junsu Kim   +4 more
doaj   +1 more source

Study and Design of Mid-infrared Apodized Grating-based Filters

Guangtongxin yanjiu, 2023
Aiming at the problem of the application of the integrated photonic filter in the 3～5 μm atmospheric window banda mid-infrared add-drop filter based on the apodized grating-assisted contra-directional coupler (contra-DC) is studied and designed.
LIANG Feng-long, ZHENG Shao-nan, QIU Yang, ZHONG Qi-ze, DONG Yuan, JIA Lian-xi, HU Ting   +6 more
doaj  

Optimization Design of Filter Bank for FMT System [PDF]

Jisuanji gongcheng, 2017
The prototype filter band attenuation of traditional Filtered Multi-tone(FMT) system is not large enough,the transition band width decays slowly,and it causes the system has low performance.In order to slove this proplem,an optimized design method of ...
MA Yaxi,FANG Jingjing
doaj   +1 more source

Quantitative Evaluation and Error Analysis of GPM DPR Rainfall Products (Version 07) Over Yangtze‐and‐Huai River Basin in China

Earth and Space Science, Volume 13, Issue 7, July 2026.
Abstract The Dual‐Frequency Precipitation Radar (DPR) aboard the Global Precipitation Measurement (GPM) core satellite has advanced global precipitation monitoring with consistent long‐term data. This study evaluates the rainfall rate from GPM DPR version 07 Level‐2 products over the Yangtze‐and‐Huai River Basin with rain gauge observations.
Zelin Wang, Xiong Hu, Jing Sun, Weihua Ai, Zitong Chen, Liang Leng, Shensen Hu, Junqi Qiao, Xianbin Zhao   +8 more
wiley   +1 more source