Results 31 to 40 of about 1,766,714 (261)

Design and Implementation of Hitl Simulator Coupleing Communications Payload and Software Spacecraft Bus [PDF]

Journal of Astronomy and Space Sciences, 2003
Engineering qualification model payload for a communications and broadcasting satellite(CBS) was developed by ETRI from May, 2000 to April, 2003. For the purpose of functional test and verification of the payload, a real-time hardware-in-the-loop(HITL ...
In-Jun Kim, Wan-Sik Choi
doaj   +1 more source

A DISTRIBUTION CONTROL UNIT FOR SATELLITE-SWITCHED COMMUNICATIONS

, 1972
International Telemetering Conference Proceedings / October 10-12, 1972 / International Hotel, Los Angeles, CaliforniaTraffic estimates for the next generation of commercial communications satellites strongly indicate the desirability of using highly ...
Cooperman, R., Dobyns, T.
core   +5 more sources

NORAD TLE Type Orbit Determination of LEO Satellites Using GPS Navigation Solutions [PDF]

Journal of Astronomy and Space Sciences, 2002
NORAD Two Line Elements (TLE) are widely used for the increasing number of small satellite mission operations and analysis. However, due to the irregular periodicity of generation of the NORAD TLE, a new TLE that is independent of NORAD is required.
Chang-Hwa Cho, Byoung-Sun Lee, Jeong-Sook Lee, Jae-Hoon Kim, Kyu-Hong Choi   +4 more
doaj   +1 more source

Lone‐Pair‐Induced Lattice Distortion in Lead‐Free Hybrid Perovskites for High‐Performance Nanogenerators

Advanced Functional Materials, EarlyView.
A lead‐free tin‐based hybrid perovskite is designed in which stereochemically active lone‐pair electrons on tin distort the crystal lattice and break its symmetry. Blended into a flexible polymer, the material converts pressure into electricity at milliwatt‐scale power density and continues working far below freezing, powering a commercial wristwatch ...
Majid Haji Bagheri, Asif Abdullah Khan, Md Fahim Al Fattah, Mahmoud Almadhoun, Shamaila Shahzadi, Aixi Pan, Md Soyaeb Hasan, Henry Wu, Arash Aghigh, Bhawna Bhawna, François Légaré, Vivek Maheshwari, Dayan Ban   +12 more
wiley   +1 more source

The Satellite Communications Network of Excellence "SatNEx" [PDF]

, 2009
SatNEx aims to overcome the fragmentation in Europe’s satellite communications research by bringing together Europe’s leading academic institutions and research organisations in a cohesive and durable way.
Lutz, Erich, Donner, Anton
core  

SatERN: a PEP-less solution for satellite communications [PDF]

, 2011
In networks with very large delay like satellite IPbased networks, standard TCP is unable to correctly grab the available resources. To overcome this problem, Performance Enhancing Proxies (PEPs), which break the end-to-end connection and simulate a ...
Lopez Pacheco, Dino, Emmanuel Lochin, Dino Martin Lopez Pacheco, Tran Thai, Tuan, Lochin, Emmanuel, Arnal, Fabrice, Fabrice Arnal, Lopez-Pacheco, Dino Martin, Tuan Tran Thai   +8 more
core   +1 more source

n‐Type Polymer Radio Frequency Rectifiers Operating at 18.5 GHz

Advanced Materials, EarlyView.
Combining an n‐doped polymer semiconductor with wafer‐scale asymmetric planar electrodes featuring work function‐engineered contacts yields radio‐frequency diodes and rectifying circuits operating at up to 18.5 GHz. The devices combine scalable manufacturing with an operating frequency previously unattainable by large‐area organic electronics ...
Lazaros Panagiotidis, Filip Aniés, Yiyang Yu, Mohammed Ghadiyali, Hendrik Faber, Zhanibek Bizak, Youssef Kabri, Pavlos Tzourmpakis, Suman Mandal, Linqu Luo, Temur Maksudov, Mohamad Insan Nugraha, Harold F. Mazo‐Mantilla, Patrice Vanelle, Julie Broggi, Khaled N. Salama, Udo Schwingenschlögl, Martin Heeney, Atif Shamim, Thomas D. Anthopoulos   +19 more
wiley   +1 more source

Africa: cyber-security and its mutual impacts with computerisation, miniaturisation and location-based authentication

EAI Endorsed Transactions on Mobile Communications and Applications, 2017
The state of insecurity occasioned by fraudulent practices in Africa has been of concern economically, both at home and abroad. In this paper, we propose ways to mitigate this problem, using Nigeria as a case study.
M.I. Adeka, K.O.O. Anoh, M. Ngala, S.J. Shepherd, E. Ibrahim, I.T.E. Elfergani, A.S. Hussaini, J. Rodriguez, R.A. Abd-Alhameed   +8 more
doaj   +1 more source

GEODA-GRUA: Adaptive Multibeam Conformal Antenna for Satellites Communications [PDF]

, 2011
The GEODA-GRUA is one conformal adaptive antenna array designed for satellite communications. Operating at 1.7 GHz with circular polarization, it is possible to track and communicate with several satellites at once being able to receive signals in full ...
Arias Campo, Marta, J. Garcia-Gasco Trujillo, M. Sierra Perez, Garcia-Gasco Trujillo, Javier, Martínez Rodríguez-Osorio, Ramón, Miguel Salas Natera, Marta Arias Campo, Salas Natera, Miguel Alejandro, Montesinos Ortego, Ignacio, Sierra Pérez, Manuel, Ignacio Montesinos, Ramon Martinez   +11 more
core   +1 more source

Wood‐Derived Nanocellulose‐Biocarbon Fresnel‐Zone Plate Lenses for Sub‐THz Frequency Applications

Advanced Materials Technologies, EarlyView.
Wood‐derived nanocellulose and lignin‐based biocarbon were combined to fabricate fully bio‐based Fresnel zone plate (FZP) lenses for sub‐terahertz frequencies. These sustainable FZP lenses exhibit low dielectric loss and high directivity, achieving performance comparable to that of metallic references, and remain functional under environmental stress ...
Riikka Haataja, Mikko Kokkonen, Niina Halonen, Sami Myllymäki, Umair Rafique, Mandeep Singh, Ossi Laitinen, Heli Jantunen, Kristiina Oksman, Henrikki Liimatainen   +9 more
wiley   +1 more source