Results 61 to 70 of about 51,915 (304)

A novel astronomical application for formation flying small satellites [PDF]

, 2009
OLFAR, Orbiting Low Frequency Antennas for Radio Astronomy, will be a space mission to observe the universe frequencies below 30 MHz, as it was never done before with an orbiting telescope.
Bentum, M.J., Boonstra, A.J., Gill, E.K.A., Veen, A.J. van der, Verhoeven, C.J.M.   +4 more
core   +1 more source

Space-based Aperture Array For Ultra-Long Wavelength Radio Astronomy

, 2015
The past decade has seen the rise of various radio astronomy arrays, particularly for low-frequency observations below 100MHz. These developments have been primarily driven by interesting and fundamental scientific questions, such as studying the dark ...
Arts, Michel, Belien, Frederik, Bentum, Mark, Boonstra, Albert-Jan, Klein-Wolt, Marc, Rajan, Raj Thilak, Saks, Noah, van der Veen, Alle-Jan   +7 more
core   +1 more source

The way forward [PDF]

, 2016
For the last few decades the study of disks around stars young and old and of different types have progressed significantly. During the same time a completely new discipline, the study of exoplanets, planets orbiting stars other than our Sun, have ...
Fridlund, Malcolm, Hatzes, Artie, Liseau, René   +2 more
core   +3 more sources

Surface Diffusion in SnTe‐PbTe Monolayer Lateral Heterostructures

Advanced Functional Materials, EarlyView.
The lateral heterostructures between 2D materials often suffer from the interdiffusion at the interfaces. Here, a surface diffusion mechanism is found to be dominating at the interfaces between semiconducting SnTe and PbTe monolayers. Atomically sharp interfaces can be achieved by suppressing this diffusion process. ABSTRACT The construction of complex
Jing‐Rong Ji, Zi'Ang Gao, Shiva Prasad Poudel, Rui‐Qi Cao, Tianzhe Chen, Luxin Li, Chong Liu, Salvador Barraza‐Lopez, Stuart S. P. Parkin, Kai Chang   +9 more
wiley   +1 more source

Consensus SE(3)-Constrained Extended Kalman Filter for Close Proximity Orbital Relative Pose Estimation

Aerospace
In this paper, a recently proposed SE(3)-constrained extended Kalman filter (EKF) is extended to formulate a strategy for relative orbit estimation in a space-based sensor network. The resulting consensus SE(3)-constrained EKF utilizes space-based sensor
S. Mathavaraj, Eric A. Butcher
doaj   +1 more source

Daris, a low-frequency distributed aperture array for radio astronomy in space [PDF]

, 2010
DARIS (Distributed Aperture Array for Radio Astronomy in Space) is a radio astronomy space mission concept aimed at observing the low-frequency radio sky in the range 1-10 MHz.
Bentum, M.J., Boonstra, A.J., Falcke, H., Klooster, K. van 't, Saks, N.   +4 more
core   +1 more source

The SGR 1806-20 magnetar signature on the Earth's magnetic field

, 2007
SGRs denote ``soft $\gamma$-ray repeaters'', a small class of slowly spinning neutron stars with strong magnetic fields. On 27 December 2004, a giant flare was detected from magnetar SGR 1806-20.
Alexandrescu, Balasis, Balasis, Boggs, Campbell, Duncan, G. Balasis, Hulot, Hurley, Hurley, Inan, Inan, Inan, Kumar, Lühr, M. Mandea, Maus, Mazets, Mazets, Parrot, Schwartz, Terasawa, Torrence, Tyler   +23 more
core   +1 more source

Inter-satellite Ranging Augmented GPS Relative Navigation for Satellite Formation Flying [PDF]

Journal of Navigation, 2013
An Augmented Relative Navigation System (ARNS) is proposed for autonomous satellite formation flying in low-Earth-orbit (LEO). Inter-satellite ranging systems such as those based on radio frequency transmissions can provide additional observation information, e.g.
Yang Yang, Yong Li, Chris Rizos, Andrew G. Dempster, Xiaokui Yue   +4 more
openaire   +1 more source

Tin‐Oxo Nanocluster Extreme UV Photoresists Equipped with Chemical Features for Atmospheric Stability and High EUV Sensitivity

Advanced Functional Materials, EarlyView.
Fluoroalkyl‐functionalized tin–oxo nanoclusters (N‐TOC6) enable robust pattern formation through ligand crosslinking under EUV exposure without thermal processing. Sn–F coordination mitigates the Lewis acidity of Sn centers, suppressing reactions with airborne molecules and improving post‐exposure pattern stability.
Yejin Ku, Gayoung Kim, Minseung Kim, Hyungju Ahn, Jin‐Kyun Lee, Jiho Kim, Byeong‐Gyu Park, Dohyun Moon, Sangsul Lee, Seohyeon Lee, Yu Ha Jang, Byung Jun Jung, Hyunseok Kim, Changhyeon Lee, Su‐Mi Hur, Ji Young Park, Chawon Koh, Tsunehiro Nishi, Hyun‐Woo Kim   +18 more
wiley   +1 more source

Satellite Formation Flying Determination with Low-Cost GNSS Receivers Raw Data

Remote Sensing
Low-cost missions are ideal for applications that require spacecraft formation flying. The use of GNSS signals provides an economical solution to determine the orbital status of the formation.
David Forero, Segundo Esteban, Oscar R. Polo   +2 more
doaj   +1 more source