Results 71 to 80 of about 115,982 (303)
Improving Time Transfer Performance for Low Earth Orbit Satellites
2024 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)Low earth orbit (LEO) provides closer satellites with lower transmission losses and delays while struggling with a smaller field of view (FoV) and larger drag. The related works have been developed in the past utilising LEO satellites for positioning by relaying the signal from GNSS to the ground station.
Triyan Pal Arora +3 more
openaire +2 more sources
Exciton Binding Energy of Phosphorescent Emitter Molecules in Organic Light‐Emitting Diodes
Advanced Functional Materials, EarlyView.Energy level alignment is key to efficient OLED design, yet determining LUMO energies remains challenging. A methodology based on field‐induced dissociation and kinetic Monte Carlo simulations is presented to extract LUMO energies of iridium‐based phosphorescent emitters from their exciton binding energy.
Hiroki Tomita +6 more
wiley +1 more source
Non-Keplerian orbits using hybrid solar sail propulsion for Earth applications [PDF]
, 2012 Half a century of space technology development has provided a wealth of new space applications. However, many still remain to be explored. Examples include increased geostationary coverage and new opportunities to enhance polar observation.
Biggs, James +3 more
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Analytical sun synchronous low-thrust manoeuvres [PDF]
, 2012 Article describes analytical sun synchronous low-thrust ...
Stephanie Y. Docherty +4 more
core +1 more source
Ultrasensitive Anti‐Stokes Luminescence Thermometry in Transition Metal Dichalcogenide Monolayers
Advanced Functional Materials, EarlyView.We demonstrate a highly sensitive nanothermometer using anti‐Stokes photoluminescence, also known as photoluminescence upconversion (UPL), in monolayer tungsten disulfide. A strong resonantly enhanced UPL is observed, confirming the central role of optical phonons in the PL upconversion mechanism.
Sharada Nagarkar +6 more
wiley +1 more source
Ground-based optical position measurements of space debris in low earth orbits [PDF]
, 2013 The increasing amount of space debris requires the satellite operators to handle a growing number of collision risk assessments in order to eventually perform collision avoidance manoeuvrers.
Hampf, Daniel +4 more
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Passive Radar Using LEO Communication Satellite Signals: An Overview and Prospect
Leida xuebaoCompared to ground-based external radiation source radar, satellite signal-based external radiation source radar (i.e., satellite signal external radiation source radar) offers advantages such as global, all-time, and all-weather coverage, which can ...
Hongwei FU +6 more
doaj +1 more source
Model Predictive Control Based on Intelligent Model for Low Earth Orbit Satellite [PDF]
فناوری در مهندسی هوافضا, 2021 In this paper, an orbit control algorithm is implemented for low earth orbit (LEO) satellites, using artificial neural networks (ANN), model-based predictive control (MPC), and linear quadratic regulator (LQR).
Taha Yasini +2 more
doaj
Advanced Functional Materials, EarlyView.Co‐delivery of electrosprayed EDOT and oxidant enables bulk oxidative polymerization during layer‐by‐layer fabrication, creating stable, highly conductive 3D PEDOT structures. This Atomized Oxidative Polymerization (AOP) overcomes the surface deposition‐only and matrix‐limited conductivity of conventional Vapor Phase Polymerization (VPP) and PEDOT:PSS ...
Tazdik Patwary Plateau +2 more
wiley +1 more source
Servicing polar platforms using electric propulsion [PDF]
, 1992 The future of space development has been examined in the context of the infrastructure necessary support it. It is concluded that the selection of propulsion systems for in-orbit transportation requires the development of general computer codes capable
Welch, C. S.
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