Results 31 to 40 of about 616,788 (312)

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

Assessing the impact of telecommunications infrastructure on the growth of national economy

π-Economy
The paper examines the relationship between indicators of telecommunications infrastructure and indicators of national economic development. The environment for the development of digital and information communications determines the intellectual level ...
Glukhov Vladimir, Loginov Aleksandr
doaj   +1 more source

Self‐Assembled Inorganic Nanomembrane Tubes: Rolled‐Up Piezoelectrics for Microacoustic Wave‐Based Actuators and Sensors

Advanced Materials, EarlyView.
This study demonstrates a self‐assembly process to generate free‐standing piezoelectric nanomembranes, forming ultracompact microtubular acoustic wave sensors and actuators. The miniaturized 3D piezoelectric platform reported in this work can be applied in telecommunication, energy harvesting, and acoustofluidics. Moreover, the 3D self‐assembly can add
Raphaël C. L‐M. Doineau, Christian N. Saggau, Stefan Baunack, Thomas Gemming, Yara Abdelaal, Robert Weser, Oliver G. Schmidt, Hagen Schmidt, Andreas Winkler, Mariana Medina‐Sánchez   +9 more
wiley   +1 more source

The challenges facing road-side ‘m-Preneurs’ in leap-frogging the constraints of ICTs in DCs: A Nigerian case study [PDF]

, 2017
Studies have shown that the number of mobile telecommunications operators in Nigeria has been on the increase since the first Global System of Mobile Telecommunications (GSM) licence was granted to MTN (Mobile Telecommunications Network) in 2001 ...
Ojukwu , Dili
core  

A Cu‐Based Near‐IR Active MOF with an Ion‐Pair Guest Exhibiting Versatile and Selective Gas‐Solid Reactivity

Advanced Materials, EarlyView.
The new Cu‐containing MOF (Me2NH2)(CuICl2)@[Cu4(INA)4Cl2O]·1.5dmf (3) contains a cation and an anion as guests and shows UV‐near‐mid‐IR absorption and near‐IR emission. MOF 3 shows gas‐solid reactivity in the presence of NH3 and HCOOH to yield two new 3D MOF.
Rajat Saha, Alejandro Cortés‐Villena, Silvia Gómez‐Coca, Alberto Fernández‐Alarcón, Joaquín Calbo, Raquel E. Galian, Enrique Ortí, Eliseo Ruiz, Mónica Giménez‐Marqués, Samia Benmansour, Carlos J. Gómez‐García   +10 more
wiley   +1 more source

RADIOTECHNOLOGIES IN THE SERVICE OF HUMAN HEALTH

Медицинский совет, 2018
The introduction of advanced radio technologies into practical healthcare provides high-tech, qualified and reliable diagnostics. Radiation methods of visualizing the activity of organs and systems in real time are the basis of personified therapy and ...
T. M. Chernova, V. N. Timchenko, A. V. Chernov   +2 more
doaj   +1 more source

Deutsche Telekom and Voicestream Merger: Charting a New Regulatory Course [PDF]

, 2001
On July 24, 2000, the German telecommunications giant Deutsche Telekom AG (Deutche Telekom) agreed to purchase the Bellvue, Washington based VoiceStream Wireless Corporation (VoiceStream) for over $50 billion.
Futch, Aaron, Giwa, Yemi, Grimmig, Andrew, Mlela, Kisa, Richardson, Amy   +4 more
core   +1 more source

3D Anodic Alumina Nanoarchitectures: A Decade of Progress from Foundational Science to Functional Metamaterials

Advanced Materials, EarlyView.
Ordered three‐dimensional anodic aluminum oxide (3D‐AAO) nanoarchitectures with longitudinal and transverse pores enable architecture‐driven metamaterials. The review maps fabrication advances, including hybrid pulse anodization, and shows how 3D‐AAO templates tailor properties across magnetism, energy, catalysis, and sensing.
Marisol Martín‐González
wiley   +1 more source

Factors, Predictability, and Explainability of Mobile Telephony Customer Departure in Telecommunications Companies: A Systematic Review of the Literature

IEEE Access
The telecommunications sector has experienced exponential growth since the year 2000, reaching 5.31 trillion users by 2022, generating 1.07 trillion in revenue for telecommunications companies.
David Freire, David Santos Mauricio Sanchez, Jose Luis Castillo Sequera, Daniel Fiallo Moncayo   +3 more
doaj   +1 more source

On channel estimation and optimal training design for amplify and forward relay networks [PDF]

, 2007
10.1109/GLOCOM.2007.763GLOBECOM - IEEE Global Telecommunications Conference4015 ...
Cui, Tao, Gao, Feifei, Nallanathan, Arumugam   +2 more
core   +2 more sources