Results 11 to 20 of about 3,713 (189)

The first Spanish Short Wave Stations: Development of radio & TV technology [PDF]

2010 Second Region 8 IEEE Conference on the History of Communications, 2010
In the thirties in Spain there were three big Short Wave Stations. One, belonging to Transradio Española in Aranjuez, 50 kilometers south of Madrid, which rendered radiotelegraphic services to the Canary Islands, Europe and America. Another, belonging to the Sociedad Anónima Radio Argentina (via Radiar), in Vallecas, on the outskirts of Madrid, also ...
openaire   +2 more sources

Analysis on the Influence of the Height of Tower on Passive Interference in shortwave

E3S Web of Conferences, 2018
The passive interference of transmission lines to nearby radio stations may affect the effective reception and transmission of radio station signals. Therefore, the accurate calculation of the electromagnetic scattering of transmission lines under the ...
Lu Ying, Zhao Zhibin, Zhang Jian gong, Gan Zheyuan   +3 more
doaj   +1 more source

Analysis on the Influence of Transmission Lines span on Passive Interference in Shortwave

E3S Web of Conferences, 2018
The passive interference of transmission lines to nearby radio stations may affect the effective reception and transmission of radio station signals. Therefore, the accurate calculation of the electromagnetic scattering of transmission lines under the ...
Lu Ying, Zhao Zhibin, Zhang Jian gong, Gan Zheyuan   +3 more
doaj   +1 more source

Impact of Overlapped AoAs on the Achievable Uplink Rate of Hybrid Beamforming for Massive MIMO mm-Wave Systems for Industrial Environments

IEEE Access, 2019
In this paper, we develop novel precoder and combiner schemes for multi-user hybrid digital-to-analog (D-A) beamforming for uplink massive multiple-input multiple-output millimeter wave (mm-Wave) systems, where the number of radio frequency chains is ...
Osama Alluhaibi, Erik Kampert, Paul A. Jennings, Matthew D. Higgins   +3 more
doaj   +1 more source

Influence of heating experiments on parameters of Schumann resonances

E3S Web of Conferences, 2017
Recently the significant increase in intensity of researches in the field of the fissile impact on geophysical processes in various environments is noted.
Agranat Irina, Sivokon Vladimir
doaj   +1 more source

Cyclic Olefin Copolymers as Versatile Materials for Advanced Engineering Applications

Advanced Functional Materials, EarlyView.
Cyclic olefin copolymers (COCs) are presented as highly versatile materials combining tunable synthesis, excellent optical properties, and mechanical robustness. Their potential spans microfluidics, bioengineering, and advanced electronics, while emerging self‐healing and sustainable solutions highlight future opportunities.
Giulia Fredi, Norma Mallegni, Andrea Dorigato, Mario Milazzo   +3 more
wiley   +1 more source

Transfer Printing and Reconfiguration of Soft Electronics Using Digital Microfluidics and Laser Machining

Advanced Functional Materials, EarlyView.
This paper presents a digital microfluidics‐based technique for transferring and reconfiguring soft nanomembranes. Laser‐machined nanothin membranes are picked up, transported, and aligned via tailored surface tension and the actuation of water droplets, enabling the development of flexible electronics, the integration of functional materials on 3D ...
Quang Anh Nguyen, Chi Cong Nguyen, Tran Bach Dang, Phuoc Thien Phan, Jordan Thorpe, Michael Listyawan, Nhat Minh Doan, Sinuo Zhao, Hongru Chen, Trung Thien Hoang, Mingsheng Xu, Jisheng Han, Thanh Nho Do, Adam Hill, Timothée Mouterde, Hoang‐Phuong Phan   +15 more
wiley   +1 more source

Beam-space MIMO-NOMA Technique for mm-Wave Communication Systems

Wasit Journal of Engineering Sciences
The multi-input-multi-output-antenna Scheme is regarded as the most promising method for next-generation wireless communication networks that employ millimeter-wave (mm-wave) frequencies and enable them to have a large information throughput.
Haider Salih Al Ammar , Ismail Hburi
doaj   +1 more source

Oxidized MoS2‐Based Multifunctional Memristive Hardware for Energy‐Efficient mmWave Signal Processing and In‐Memory Matrix Multiplication

Advanced Functional Materials, EarlyView.
Thermally oxidized MoS2‐based radio‐frequency switches enable a multifunctional platform that unifies broadband RF switching and in‐memory computation. The device achieves a cutoff frequency of 33.2 THz with high energy efficiency and supports hardware‐aware signal processing.
Juho Son, Changwoo Pyo, Sungmoon Park, Yoongi Cho, Seungchan Lee, Myungsoo Kim   +5 more
wiley   +1 more source

Low‐Profile, High‐Gain GRIN RF Lenses via Multi‐Material Vat Photopolymerization

Advanced Functional Materials, EarlyView.
We investigate the opportunity of leveraging multi‐material vat photopolymerization printing to manufacture intricate lenses exhibiting permittivity gradients that can increase signal gain in transmitted radiofrequency signals in the X‐ and Ku‐bands. Lenses produced with more distinct low‐loss materials (up to 5) can deliver an 18 dB signal gain with a
Lawrence Romangsuriat, Alexander Peraire‐Bueno, A. John Hart, Randall M. Erb   +3 more
wiley   +1 more source