Results 81 to 90 of about 2,815 (307)

Opportunities of Semiconducting Oxide Nanostructures as Advanced Luminescent Materials in Photonics

Advanced Materials, EarlyView.
The review discusses the challenges of wide and ultrawide bandgap semiconducting oxides as a suitable material platform for photonics. They offer great versatility in terms of tuning microstructure, native defects, doping, anisotropy, and micro‐ and nano‐structuring. The review focuses on their light emission, light‐confinement in optical cavities, and
Ana Cremades, Pedro Hidalgo, David Maestre, Ruth Martínez‐Casado, Emilio Nogales, Beatriz Rodríguez, G. Cristian Vásquez, Bianchi Méndez   +7 more
wiley   +1 more source

A selfl-adaptive magnetic charged system for time-suboptimal formation flying maneuvers [PDF]

, 2019
The development of fast and reliable optimization algorithms is required in order to obtain real-time optimal trajectory on-board spacecraft. In addition, the wide spread of small satellites, due to their low costs, is leading to a greater number of ...
Dario Spiller, Fabio Curti, Andrea D’Ambrosio   +2 more
core  

Effective Sensitivity Analyses of Radar Systems in Formation Flying using Differential Algebra [PDF]

, 2022
Spacecraft Formation Flying is a technology that has been increasingly used in recent years. Distributed formations of low-cost SmallSats, both deployable and free-flying, can provide mission ca pability comparable to or greater than large monolithic ...
Beauchamp, Robert., Mao, Peter, Apa, Riccardo, Quadrelli, Marco B.   +3 more
core  

Study on maintaining formations during satellite formation flying based on SDRE and LQR

Open Physics, 2017
Due to the influence of various perturbations of space, satellites flying in formation cannot maintain specific configurations for long durations [1, 2]. In order to ensure that formation configurations are able to meet the requirements of space missions,
Ke Zhang, Zhenqi He, Meibo Lv
doaj   +1 more source

A Single-Use Microthruster Concept for Small Satellite Attitude Control in Formation-Flying Applications

Aerospace, 2018
In recent years, the maturation of small satellite technology has led to their adoption for a variety of space missions. The next generation of small satellite missions, however, will likely have the satellites operating in formations or “constellations”
Sandra Romero-Diez, Lydia Hantsche, Jason M. Pearl, Darren L. Hitt, M. Ryan McDevitt, Patrick C. Lee   +5 more
doaj   +1 more source

Flexoelectrically Induced Polar Topology in Twisted SrTiO3 Membranes

Advanced Materials, EarlyView.
Twisted SrTiO3 bilayers host polar vortices of flexoelectric origin, revealed through combined experiment and theory. By reconstructing polarization from the toroidal moment of strain gradients, the work establishes a 3D chiral state with broken inversion and mirror symmetries.
Isabel Tenreiro, Hugo Aramberri, Víctor Rouco, Gabriel Sánchez‐Santolino, Mariona Cabero, Fernando Gallego, David Sánchez‐Manzano, José M. González‐Calbet, Federico Mompeán, Mar García‐Hernández, Alberto Rivera‐Calzada, Jorge Íñiguez‐González, Carlos León, Jacobo Santamaría   +13 more
wiley   +1 more source

Spaceborne Autonomous and Ground Based Relative Orbit Control for the TerraSAR-X/TanDEM-X Formation [PDF]

, 2007
TerraSAR-X (TSX) and TanDEM-X (TDX) are two advanced synthetic aperture radar (SAR) satellites flying in formation. SAR interferometry allows a high resolution imaging of the Earth by processing SAR images obtained from two slightly different orbits. TSX
Gill, Eberhard, Ardaens, J. S., Kazeminejad, Bobby, Montenbruck, O., Ardaens, Jean-Sebastien, D'Amico, Simone, Montenbruck, Oliver, D'Amico, S., Gill, E., Kazeminejad, B.   +9 more
core   +1 more source

ESTABLISHMENT OF SATELLITE FORMATION WITH INITIAL UNCERTAINTY BY CONTROL LYAPUNOV FUNCTION APPROACH DOI 10.5028/jatm.2012.04014511

Journal of Aerospace Technology and Management, 2012
In recent years, dynamics and control of satellite formation flying have been active areas of research. From the mission planning perspective, three main areas namely formation establishment, maintenance and reconfiguration have been discussed.
M Navabi, M Barati, Hossein Bonyan Khamseh   +2 more
doaj  

Ion‐Reconfigurable “N”‐Shaped Antiambipolar Behavior in Organic Electrochemical Transistors

Advanced Materials, EarlyView.
A unique N‐shaped negative differential transconductance (NDT) characteristics is demonstrated in single‐polymer organic electrochemical transistors through a sequential doping–redox–doping process driven by iodide ions. This redox‐driven mechanism enables low‐voltage, ion‐controlled reconfigurability and tunable current modulation, allowing seamless ...
Debdatta Panigrahi, Daniele Zucchelli, Zeinab Hamid, Christina Kousseff, Arup Sarkar, Aristea Pavlou, Zhitian Ling, Somayeh Kashani, Iain McCulloch, Paul W. M. Blom, Fabrizio Torricelli, Paschalis Gkoupidenis   +11 more
wiley   +1 more source

TerraSAR-X/TanDEM-X Formation Control - First Results from Commissioning and Routine Operations [PDF]

, 2011
This paper describes the TerraSAR-X / TanDEM-X formation control concept, which bases on the relative eccentricity / inclination vector separation method, implemented within GSOC’s flight dynamics system.
Schlepp, Benjamin, Kirschner, Michael, Kahle, Ralph   +2 more
core