Results 71 to 80 of about 2,036 (280)
Connectivity Analysis of Mega Constellation Satellite Networks with Optical Inter-Satellite Links
, 2021 Recently, low earth orbit (LEO) satellite-based systems have attracted tremendous attention and various technologies have been developed for payload miniaturization and optical communications. In addition, mega-constellation architectures are expected to
Choi, Jihwan P., Lee, Yonghwa
core +1 more source
Advanced Materials Technologies, EarlyView.One‐dimensional C4N2H14PbBr4 is shown to have a quasi‐direct electronic band structure and strongly anisotropic transport with polarized broadband emission. A GW/Bethe–Salpeter excited‐state force formalism, supported by polarized Raman and temperature‐dependent photoluminescence, identifies low–frequency Pb–Br phonons that drive ultrafast exciton self‐
Rijan Karkee +7 more
wiley +1 more source
DESIGN OF A MINI LEO GNSS CONSTELLATION AND A CUSTOM GNSS SIGNAL SIMULATOR DEVELOPMENT
, 2023 This thesis is concerned with Low Earth Orbit (LEO) Global Navigation Satellite Systems (GNSS) constellations and signals, and how can they provide rapid Positioning, Navigation, and Timing (PNT) services for the emerging technologies.
Yaser, Mohamed Mohamed
core
LEO Satellite Constellation for Global-Scale Remote Sensing With On-Orbit Cloud AI Computing
, 2023 This article proposes a new satellite-based framework for global-scale remote sensing that is integrated with on-orbit cloud computing and artificial intelligence (AI) services.
Yuejin Li +4 more
core +1 more source
Phase Diagrams and Piezoelectric Properties of Wurtzite Al1−x−yScxGdyN Heterostructural Alloys
Advanced Science, EarlyView.This study demonstrates ferroelectricity and piezoelectric properties improvement of quaternary wurtzite Al1−x−yScxGdyN${\rm Al}_{1-x-y}{\rm Sc}_x{\rm Gd}_y{\rm N}$ films, guided by density functional theory calculations. Wurtzite Al1−x−yScxGdyN${\rm Al}_{1-x-y}{\rm Sc}_x{\rm Gd}_y{\rm N}$ films have a high optical bandgap, enhanced piezoelectric ...
Julia L. Martin +11 more
wiley +1 more source
LEO Precise Orbit Determination with Inter-satellite Links
Remote Sensing, 2019 Traditional precise orbit determination (POD) for low Earth orbit (LEO) satellites relies on observations from ground stations and onboard receivers.
Xingxing Li +5 more
doaj +1 more source
Edge Selection and Clustering for Federated Learning in Optical Inter-LEO Satellite Constellation
, 2023 Low-Earth orbit (LEO) satellites have been prosperously deployed for various Earth observation missions due to its capability of collecting a large amount of image or sensor data.
Shen, Li-Hsiang +4 more
core
Atomic Tuning of Metal‐Support Interactions for Pathway‐Selective CO2 Photoreduction on TiO2
Advanced Science, EarlyView.Single‐atom Fe and Cu catalysts anchored on TiO2 steer photocatalytic CO2 reduction toward distinct pathways. Fe sites favor rapid *CO desorption and selective CO formation, whereas Cu sites stabilize *CHO intermediates, enabling deep reduction and C─C coupling. Combined spectroscopy and DFT calculations reveal how metal–support interactions and oxygen
Dongyun Kim +13 more
wiley +1 more source
Self-organising low Earth orbit constellations for Earth observation
, 2014 This paper presents a novel method of manipulating the spatial pattern of a fractionated micro-satellite constellation in Low Earth Orbit. The method developed allows satellites to manipulate the longitudinal position of their ground-tracks over the ...
McInnes, Colin, Mushet, Garrie
core
On Architecting LEO Mega-Constellation Networks
, 2023 Satellites offer advantage in their wide coverage and immunity from terrestrial disasters. Recently, the power of low earth orbit (LEO) satellites has been clearly demonstrated in many applications including communication and Earth observation.
Choi, Jihwan P.
core +1 more source