Results 11 to 20 of about 3,725 (190)

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

Achieving High ON State Current through Ferroelectric Polarization‐Dependent Interfacial Resistance Switching in Undoped Orthorhombic HfO2 Films

Advanced Functional Materials, EarlyView.
Ferroelectric tunnel junction devices based on epitaxial undoped ferroelectric HfO2 films demonstrate stable switching endurance of over 106 switching cycles, low write voltages of ±3 V, 16 measured resistance states, and neuromorphic capability.
Markus Hellenbrand, Nuno Estrócio, Ji S. Kim, Babak Bakhit, Marian C. Istrate, Corneliu Ghica, Tiago Rebelo, Nives Strkalj, Abin Varghese, Bernardo Almeida, Luís S. Marques, Bipin Rajendran, Judith L. MacManus‐Driscoll, José P. B. Silva   +13 more
wiley   +1 more source

Tunable Complementary Doping Strategy Enables High‐Performance Homo‐Channel CMOS in Monolayer WSe2

Advanced Functional Materials, EarlyView.
Polarity‐selective modulation enables a homo‐channel WSe2 CMOS platform from a single 2D semiconductor. MoOx and AlN tune WSe2 toward p‐ and n‐type operation, respectively, yielding complementary FETs and inverters with balanced switching, high voltage gain, low static power, and promising scalability for 2D logic integration.
Kuan‐Hsiang Chiu, Wen‐Chia Wu, His‐Yu Chen, Chien‐Chih Liu, Ze‐Rui Lin, Chiung‐Yuan Lin, Chenming Hu, Chao‐Hsin Chien   +7 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

Imaging the Thickness‐Dependent Formation of Schottky Barriers in Metal–Semiconductor van der Waals Heterostructures

Advanced Functional Materials, EarlyView.
Using nanobeam photoemission, we demonstrate imaging of the in‐plane and out‐of‐plane electric field landscape within a metal–semiconductor van der Waals heterostructure. We provide evidence for Schottky barrier formation that depends on the semiconductor thickness. ABSTRACT Achieving high‐performance optoelectronic devices based on two‐dimensional van
Dario Mastrippolito, Mariarosa Cavallo, Marco Paye, Clement Gureghian, Albin Colle, Jiho Roh, Dipak Maity, Clemence Villefroy, Erwan Dandeu, Herve Cruguel, Stephane Lorcy, Marie Hervé, James K. Utterback, Pavel Dudin, Johan Biscaras, José Avila, Emmanuel Lhuillier, Debora Pierucci   +17 more
wiley   +1 more source

Mixed‐Metal Promotion in a Manganese‐Molybdenum Oxynitride as Catalyst to Integrate C─C and C─N Coupling Reactions for the Direct Synthesis of Acetonitrile from Syngas and Ammonia

Advanced Materials, EarlyView.
Transition metal oxy/carbo‐nitrides show great promise as catalysts for sustainable processes. A Mn‐Mo mixed‐metal oxynitride attains remarkable performance for the direct synthesis of acetonitrile, an important commodity chemical, via sequential C─N and C─C coupling from syngas (C1) and ammonia (N1) feedstocks.
M. Elena Martínez‐Monje, Wilson Henao, Tania Rodenas, Patricia Concepción, Virginia Pérez Dieste, Alexander Missyul, Giovanni Agostini, Gonzalo Prieto   +7 more
wiley   +1 more source