Results 111 to 120 of about 353,976 (345)

Development and implementation of an adaptive digital beamforming network for satellite communication systems [PDF]

, 1991
The use of adaptive digital beamforming techniques has, until recently, been largely restricted to high performance military radar systems. Recent advances in digital technology, however, have enabled the design of single chip digital beamforming ...
Barrett, M, Fernández Rubio, Juan Antonio   +1 more
core   +1 more source

Advances and Perspectives in Graphene‐Based Quantum Dots Enabled Neuromorphic Devices

Advanced Science, EarlyView.
Graphene‐based QDs are zero‐dimensional carbon nanomaterials with pronounced quantum confinement and tunable electronic structures. Herein, we summarize their synthesis strategies and functionalization methods, and highlight their functional roles and operating mechanisms in devices, as well as recent advances in neuromorphic electronics. We anticipate
Yulin Zhen, Wei Zeng, Zherui Zhao, JiYu Zhao, Ziyan Huang, Zhuo Chen, Kui Zhou, Guanglong Ding, Su‐Ting Han, Ye Zhou   +9 more
wiley   +1 more source

Analysis of satellite-terrestrial frequency sharing technology for 5G and 6G mobile communication

Dianxin kexue
In recent years, mobile communication technology has developed rapidly, with 5G networks being widely deployed globally, and research on 6G technology is also underway.
HU Yanwei, GONG Jian, MA Zhanshu
doaj  

Multichannel demultiplexer/demodulator technologies for future satellite communication systems [PDF]

NASA-Lewis' Space Electronics Div. supports ongoing research in advanced satellite communication architectures, onboard processing, and technology development.
Abramovitz, Irwin, Budinger, James M., Courtois, Hector A., Ivancic, William D., Staples, Edward J.   +4 more
core   +1 more source

Propagation Characterization of LEO/MEO Satellite Systems at 900-2100 MHz [PDF]

, 1999
This paper focuses on the propagation characterization of satellite communication systems in non-geostationary orbits at 900-2100MHz. An overview of available statistical propagation models for the mobile satellite communications channel is provided ...
Osborne, William P., Xie, Yongjun
core   +1 more source

Synergistic Pyro‐Phototronics and Structural Anisotropy in CsAg2I3/GaN Heterostructures for High‐Performance Polarization‐Sensitive UV Photodetectors

Advanced Science, EarlyView.
The development of polarization‐sensitive ultraviolet photodetectors is limited by poor heterojunction quality and low polarization sensitivity. This study integrates synthesized CsAg2I3 single crystals with intrinsic non‐centrosymmetry into van der Waals heterojunction devices, demonstrating pronounced pyro‐phototronic effect.
Yalin Zhai, Siqi Wang, Peng Guo, Songling Feng, Peng Wan, Jilong Tang, Caixia Kan, Hui Li, Daning Shi, Mingming Jiang   +9 more
wiley   +1 more source

Electron Delocalization Induced by 3d–4f Orbital Hybridization of Co─Ce Atom Pairs Toward Enhanced Electromagnetic Wave Attenuation and Antibacterial Performance

Advanced Science, EarlyView.
Co─Ce dual atomic configuration anchored on the surface of NC matrix has been constructed to regulate the local electron structure. The higher occupied states induced by the Co 3d‐Ce 4f orbital hybridization facilitate the formation of polarized electric fields, which in turn strengthens the polarization relaxation and partially repairs the effective ...
Da Li, Yinyin Zhao, Yang Zhang, Cui Ni, Xiaoguang Zhao, Chongchang Zhou, Guoqiang Ren, Pengfei Liu, Xiubo Xie   +8 more
wiley   +1 more source

A separation algorithm for satellite-based AIS received signals based on SSA and RobustICA

Zhongguo Jianchuan Yanjiu
ObjectiveIn high-density traffic areas, ship collision automatic identification system (AIS) signals often occur, so high requirements are put forward for the separation performance and real-time performance of the receiver.MethodsFor mixed signals with ...
Jiansen ZHAO, Zhihao TAN, Haiyan DUAN, Xia LIU, Shengzheng WANG   +4 more
doaj   +1 more source

The 30/20 GHz communications system functional requirements [PDF]

The characteristics of 30/20 GHz usage in satellite systems to be used in support of projected communication requirements of the 1990's are defined. A requirements analysis which develops projected market demand for satellite services by general and ...
Frankfort, M., Markham, R., Siperko, C. M., Wall, M.   +3 more
core   +1 more source

Self‐Amplifying Redox Cycle Triggers Ferroptosis/Cuproptosis Synergy for Enhanced Bacterial Eradication

Advanced Science, EarlyView.
This study designs a targeted nanocomposite (ct@HMCF‐Dex) that responds to acidic infection microenvironments, releasing components which amplify oxidative stress. It disrupts bacterial redox balance, chelates metals to sustain lipid peroxidation, and synergistically induces cuproptosis/ferroptosis‐like death.
Zehui Xiao, Shaolong Qiu, Jiangli Cao, Jifeng Liu, Zhiyong Song, Ting Du, Xinjun Du   +6 more
wiley   +1 more source