Results 61 to 70 of about 44,451 (275)

End-to-End Performance Analysis of CCSDS O3K Optical Communication System Under Atmospheric Turbulence and Pointing Errors

Aerospace
Free-space optical (FSO) communication systems face significant challenges from atmospheric turbulence, which induces time-correlated fading and burst errors that critically affect link reliability.
Seung Woo Sun, Jung Hoon Noh
doaj   +1 more source

Flexible Polypyrrole‐Based pH Sensors via Oxidative Chemical Vapor Deposition

Advanced Healthcare Materials, EarlyView.
Oxidative chemical vapor deposition (oCVD) of polypyrrole (PPy) thin films yields flexible, electrically conductive, and biocompatible pH sensors for monitoring on‐skin biological events. The highly sensitive, oCVD PPy skin‐conformal sensors enable real‐time, spatially resolved sensing of dynamic pH changes within physiologically relevant ranges (4–9 ...
Adrivit Mukherjee, Federico Ferrari, David Garcia Romero, Ilaria Squillante, Job Schoenmaker, Hamoon Hemmatpour, Anton Terpstra, Peter Dijkstra, Julien Es Sayed, L. Jan Anton Koster, Maria Antonietta Loi, Petra Rudolf, Giuseppe Portale, Ajay Giri Prakash Kottapalli, Marleen Kamperman, Ranjita K. Bose   +15 more
wiley   +1 more source

A ground-to-GEO-to-LEO satellite optical wireless communication link based on a spectrally efficient and secure modulation scheme

Frontiers in Physics
Optical wireless communication (OWC) offers significant advantages over traditional radio frequency systems due to its high bandwidth, ease of deployment, license-free operation, immunity to electromagnetic interference, and inherent security benefits ...
Chen Xu, Umair Ali Khan, Salman Ghafoor, Jawad Mirza, Abdulah Jeza Aljohani, Imran Aziz   +5 more
doaj   +1 more source

Four years operations of Inter-satellite and SpaceGround Optical links

, 2018
During the past four years, the laser communication terminal on board of Alphasat GEO-stationary satellite has achieved the successful execution of more than 1300 optical links which implies more than 24.000 tasks for the planning system. This laser terminal in combination with a Ka-Band system constitutes the TDP1 technology demonstrator ...
Pimentel, Patricia, Hoepke, Nils, Seiter, Christoph, Saucke, Karen, Heine, Frank F., Motzigemba, Matthias, Martin, Siegbert, Benzi, Edoardo, Rossmanith, Gregor Johannes, Kuhlmann, Sven, Lutzer, Michael, Meyer, Rolf   +11 more
openaire   +2 more sources

Modulation and coding for throughput-efficient optical free-space links [PDF]

Optical direct-detection systems are currently being considered for some high-speed inter-satellite links, where data-rates of a few hundred megabits per second are evisioned under power and pulsewidth constraints.
Georghiades, Costas N.
core   +1 more source

A Cu‐Based Near‐IR Active MOF with an Ion‐Pair Guest Exhibiting Versatile and Selective Gas‐Solid Reactivity

Advanced Materials, EarlyView.
The new Cu‐containing MOF (Me2NH2)(CuICl2)@[Cu4(INA)4Cl2O]·1.5dmf (3) contains a cation and an anion as guests and shows UV‐near‐mid‐IR absorption and near‐IR emission. MOF 3 shows gas‐solid reactivity in the presence of NH3 and HCOOH to yield two new 3D MOF.
Rajat Saha, Alejandro Cortés‐Villena, Silvia Gómez‐Coca, Alberto Fernández‐Alarcón, Joaquín Calbo, Raquel E. Galian, Enrique Ortí, Eliseo Ruiz, Mónica Giménez‐Marqués, Samia Benmansour, Carlos J. Gómez‐García   +10 more
wiley   +1 more source

Queuing Delay Analysis for Wavelength Routing Optical Satellite Networks Over Dual-Layer Constellation

IEEE Photonics Journal
Optical satellite networks (OSN) utilizing wavelength division multiplexing (WDM) inter-satellite links (ISLs) and wavelength routing is becoming a new trend in constructing high-speed, large-capacity, and low-latency global network systems.
Jingkai Yang, Qiwen Ran, Jing Ma
doaj   +1 more source

Microwave vs optical crosslink study [PDF]

The intersatellite links (ISL's) at geostationary orbit is currently a missing link in commercial satellite services. Prior studies have found that potential application of ISL's to domestic, regional, and global satellites will provide more cost ...
Bruno, Ronald C., Kwong, Paulman W., Marshalek, Robert G.   +2 more
core   +1 more source

Metamaterial Antennas Enhance MRI of the Eye and Occipital Brain

Advanced Materials, EarlyView.
A radiofrequency antenna platform comprising planar and bend configurations is developed, incorporating structurally integrated epsilon‐negative metamaterial unit cells to enhance MRI. These antennas enable high‐resolution in vivo human MRI of the eye, orbit, and occipital brain. Comprehensive validation, including simulations, phantom experiments, SAR,
Nandita Saha, Bilguun Nurzed, Mostafa Berangi, Andre Kuehne, Helmar Waiczies, Igor Fabian Tellez Ceja, Xiang Hu, Thomas Gladytz, Lisa Krenz, Dave Huebler, Beate Endemann, Claudia Brockmann, Ebba Beller, Oliver Stachs, Thoralf Niendorf   +14 more
wiley   +1 more source

Functional Metal Complexes for Solar–Light‐Driven Energy Conversion

Advanced Materials, EarlyView.
This review provides an exhaustive summary of the recent advancements of functional metal complexes in solar‐to‐electrical, ‐chemical, and ‐thermal energy conversion, comprising material categories, design strategies, underlying principles of operation, and identified improvement of performances.
Yanyan Qin, Dou Luo, Miao Zhang, Wai‐Yeung Wong   +3 more
wiley   +1 more source