Results 101 to 110 of about 7,276 (303)

Modeling and simulation of earth coverage of a low earth orbit (LEO) satellite

European Mechanical Science
Efficient management of operations in near space, just beyond the Earth’s atmosphere, relies on the precise control of satellites positioned relatively close to our planet. Satellite systems, serving critical functions in telecommunications, observation,
Murat Bakırcı
doaj   +1 more source

A 3D In Vitro Model of the Human Hepatobiliary Junction

Advanced Science, EarlyView.
A 3D human organoid platform reconstructs the hepatobiliary junction between primary adult hepatocytes and intrahepatic cholangiocytes. These adult hepatobiliary organoids (aHBOs) support directional bile transport from canaliculi to ductule‐like structures, enable quantitative imaging of junction dynamics, and reveal cell‐type‐specific vulnerabilities
Ashley D. Westerfield, Katarzyna A. Grzelak, Katie Katsuyama, Vardhman Kumar, Bess M. Miller, Joa Yun, Jesse Kirkpatrick, David Mankus, Margaret E. Bisher, Abigail K.R. Lytton‐Jean, Z. Gordon Jiang, David D. Lee, Christopher S. Chen, Sangeeta N. Bhatia   +13 more
wiley   +1 more source

GPS-Based Precision Baseline Reconstruction for the TanDEM-X SAR-Formation

, 2007
The TanDEM-X formation employs two separate spacecraft to collect interferometric Synthetic Aperature Radar (SAR) measurements over baselines of about 1 km.
van Barneveld, Luuk, Montenbruck, Oliver, Visser, Pieter, Yoon, Yoke   +3 more
core  

Delay-Outage Analysis of Multi-LEO Satellites Communication System

, 2023
In this work, we investigate LEO satellite communication with relaying under Nakagami-m fading channels, enabling the terrestrial source to transmit packets to the terrestrial destination via the LEO satellite constellation.
Refik Caglar Kizilirmak, Aigerim Ospanova, Behrouz Maham   +2 more
core   +1 more source

Research on Stateless Address Auto-Confi guration and Duplicate Address Detection in Space-Integrated-Ground Information Network

天地一体化信息网络, 2021
LEO (Low Earth Orbit) satellites with high mobility in space-integrated-ground information network cause ground user terminals change connected satellites continuously, so user terminals can't keep stable IPv6 addresses.SLAAC (Stateless Address Auto ...
Yazheng CHEN, Hewu LI
doaj   +2 more sources

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, Cheng‐Wei Lee, Nate S.P. Bernstein, Thi Nguyen, Ande Bryan, Eli Cooper, John S. Mangum, Sage R. Bauers, Andriy Zakutayev, Keisuke Yazawa, Prashun Gorai, Rebecca W. Smaha   +11 more
wiley   +1 more source

A New Approach for Enhanced Communication to LEO Satellites

, 2010
Operations of satellites in Low-Earth Orbit (LEO) have been based on exploiting the maximum time of visibility of satellites over their ground stations.
De Milliano, M. (author), Eberhard Gill, De Milliano, M., Verhoeven, C., Katharina Gill, Verhoeven, C. (author), Gill, K., Gill, E.K.A. (author), Gill, E.K.A., Chris Verhoeven, Gill, K. (author)   +10 more
core   +1 more source

Federated Reinforcement Learning Based AANs with LEO Satellites and UAVs. [PDF]

Sensors (Basel), 2021
Yoo S, Lee W.
europepmc   +1 more source

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, Wonjae Ko, Byoung‐Hoon Lee, Sanghoon Kim, Yun Do Kim, Hyunsoo Ahn, Yoon Jung, Chan Woo Lee, Kug‐Seung Lee, Eunhee Gong, Junho Lee, Minho Kim, Taeghwan Hyeon, Su‐Il In   +13 more
wiley   +1 more source

Verification of Ground Station Diversity for Direct Optical TTC-Downlinks from LEO Satellites by means of an Experimental Laser Source

, 2010
Most of today's satellites make use of microwave data-links for their TTC-downlinks. However, these data-links are limited in terms of achievable data-rate and spectrum availability.
Fuchs, Christian, Giggenbach, Dirk, Brechtelsbauer, Martin   +2 more
core