Results 21 to 30 of about 2,365 (260)

Satellite Constellation Internet Affordability and Need [PDF]

Research Notes of the AAS, 2020
Abstract Large satellite constellations in low-Earth orbit seek to be the infrastructure for global broadband Internet and other telecommunication needs. We briefly review the impacts of satellite constellations on astronomy and show that the Internet service offered by these satellites will primarily target populations where it is ...
Rawls, Meredith L., Thiemann, Heidi B., Chemin, Victor, Walkowicz, Lucianne, Peel, Mike W., Grange, Yan G.   +5 more
openaire   +2 more sources

Impact of Mega Constellations on Geospace Safety

Aerospace, 2022
The extent of the impact of mega constellations on the low-orbiting geospace environment, which has not yet been assessed in more concrete quantitative terms, is an extremely important issue to consider as mega constellations are built.
Haicheng Tao, Qinyu Zhu, Xueke Che, Xinhong Li, Wanxin Man, Zhibin Zhang, Guohui Zhang   +6 more
doaj   +1 more source

Large Constellations of Small Satellites: A Survey of Near Future Challenges and Missions

Aerospace, 2020
Constellations of satellites are being proposed in large numbers; most of them are expected to be in orbit within the next decade. They will provide communication to unserved and underserved communities, enable global monitoring of Earth and enhance ...
Giacomo Curzi, Dario Modenini, Paolo Tortora   +2 more
doaj   +1 more source

Characterization of Mega-Constellation Links for LEO Missions With Applications to EO and ISS Use Cases

IEEE Access, 2023
Satellite missions demand ever greater connectivity, especially in the LEO regime. In this paper, we introduce the new mega-constellation services in space paradigm: we show that mega-constellations, deployed to offer innovative services to Earth’ ...
Gabriel Maiolini Capez, Mauricio A. Caceres, Roberto Armellin, Chris P. Bridges, Stefan Frey, Roberto Garello, Pier Bargellini   +6 more
doaj   +1 more source

Novel virtual satellite formation scheme for deterministic transmission

Tongxin xuebao, 2023
Although satellite formation flying could effectively support deterministic transmission due to its stable formation, but its formation control required significant real-time computational overhead and did not support flexible deployment for multi ...
Chuan XU, Mi ZHOU, Guofeng ZHAO, Zhaojing CUI, Xiongwen HE   +4 more
doaj   +2 more sources

Electrochemical Behavior of Flame‐Sprayed Sc‐Doped AlCoCrFeMo High‐Entropy Alloy Coatings in 3.5% Sodium Chloride Solution

Advanced Engineering Materials, EarlyView.
Scandium (Sc)‐doped AlCoCrFeMo HEA coatings are fabricated via flame spraying with 0.1, 0.3, and 0.5 wt% Sc additions. Among these, the HEA‐Sc0.3 coating exhibits the highest corrosion resistance, indicated by a more positive corrosion potential and lower current density.
Pankaj Kumar, Akash Vyas, Mohammad Aatif Qazi, Nashit Jalal, Maria Ophelia Jarligo, Mostafa Yakout, Jing Liu, André McDonald   +7 more
wiley   +1 more source

Inverse Identification of Energy‐Dependent Laser Absorptivity in NiTi Laser Powder‐Bed Fusion via Calibrated Melt Pool Simulation

Advanced Engineering Materials, EarlyView.
A combined experimental–computational framework identifies energy‐dependent laser absorptivity for NiTi in laser powder‐bed fusion, applicable to conduction and transition modes. Single‐track experiments and thermofluid smoothed particle hydrodynamics simulations are coupled through inverse analysis of melt pool geometry.
Mohamadreza Afrasiabi, Hadi Moutablaleh, Ignatius A. Setiawan, Mehrshad Mehrpouya   +3 more
wiley   +1 more source

Handover Strategies for Emerging LEO, MEO, and HEO Satellite Networks

IEEE Access
Satellite networks are expected to support global connectivity via future 3GPP non-terrestrial networks (NTNs), as well as private non-geostationary satellite orbit (NGSO) constellations, e.g. OneWeb, SpaceX, and Amazon’s Kuiper.
Andra M. Voicu, Abhipshito Bhattacharya, Marina Petrova   +2 more
doaj   +1 more source

Composites of Shellac and Silver Nanowires as Flexible, Biobased, and Corrosion‐Resistant Transparent Conductive Electrodes

Advanced Functional Materials, EarlyView.
Shellac, a centuries‐old natural resin, is reimagined as a green material for flexible electronics. When combined with silver nanowires, shellac films deliver transparency, conductivity, and stability against humidity. These results position shellac as a sustainable alternative to synthetic polymers for transparent conductors in next‐generation ...
Rahaf Nafez Hussein, Tiago Carneiro Gomes, Eliza Ng, Simon Rondeau‐Gagné, Tricia Breen Carmichael   +4 more
wiley   +1 more source

Constellation design and performance of future quantum satellite gravity missions

Earth, Planets and Space
Temporal aliasing is currently the largest error contributor to time-variable satellite gravity field models. Therefore, the evolution of sensor technologies has to be complemented by strategies to reduce temporal aliasing errors.
P. Zingerle, T. Gruber, R. Pail, I. Daras   +3 more
doaj   +1 more source