Results 61 to 70 of about 31,489 (272)

Pattern transition in spacecraft formation flying using bifurcating potential field [PDF]

, 2012
Many new and exciting space mission concepts have developed around spacecraft formation flying, allowing for autonomous distributed systems that can be robust, scalable and flexible.
Bennet, Derek James, McInnes, Colin
core   +1 more source

Long term and safe relative orbit design for heterogeneous spacecraft clusters

Advances in Space Research, 2021
Abstract The problem of obtaining long term relative orbit configurations for spacecraft clusters with realistic operational considerations such as safety, station keeping and inter-spacecraft distances is addressed. Two different approaches are developed for station keeping and safety objectives. In the first approach, relative orbit configurations,
Yaglioglu, Burak, Tekinalp, Ozan
openaire   +2 more sources

In Situ X‐Ray Tomography and Acoustic Emission Monitoring of Damage Evolution in C/C‐SiC Composites Fabricated by Liquid Silicon Infiltration

Advanced Science, EarlyView.
This study investigates how the internal structure of fiber‐reinforced ceramic composites affects their resistance to damage. By combining 3D X‐ray imaging with acoustic emission monitoring during mechanical testing, it reveals how silicon distribution influences crack formation.
Yang Chen, Renato S. M. Almeida, Stefan Flauder, Guillaume Couégnat, Kamen Tushtev, Jürgen Horvath, Peter Wriggers, Kurosch Rezwan   +7 more
wiley   +1 more source

Analysis of three-spacecraft data using planar reciprocal vectors: methodological framework and spatial gradient estimation [PDF]

Annales Geophysicae, 2009
In the context of ESA's Cluster mission, four-point array techniques are widely used to analyze space plasma phenomena such as shocks and discontinuities, waves and turbulence, and spatial gradients.
J. Vogt, A. Albert, O. Marghitu
doaj   +1 more source

The K2 Mission: Characterization and Early results

, 2014
The K2 mission will make use of the Kepler spacecraft and its assets to expand upon Kepler's groundbreaking discoveries in the fields of exoplanets and astrophysics through new and exciting observations.
Aigrain, Suzanne, Barclay, Thomas, Bryson, Stephen T., Caldwell, Doug, Chaplin, William J., Cochran, William D., Fortney, Jonathan J., Haas, Michael, Howell, Steve B., Huber, Daniel, Marcy, Geoffrey W., Miglio, Andrea, Mullally, Fergal, Najita, Joan R., Smith, Marcie, Sobeck, Charlie, Still, Martin, Troeltzsch, John, Twicken, J. D.   +18 more
core   +1 more source

Piezo‐Phototronic PVDF/HfO2/Nano‐Cu Heterostructured Thin Film for Flexible Self‐Powered Multimodal Sensing

Advanced Science, EarlyView.
Electrospinning a composite of PVDF, HfO2, and nano‐Cu transforms the discrete precursors into a continuous nanofiber mesh, forming a multi‐interface heterostructure with embedded nanoparticles. The presence of HfO2 and nano‐Cu at the fiber interfaces induces a highly aligned β‐phase, which enhances piezoelectric crystallinity and improves the material'
Jiawei Gu, Qiongle Peng, Xuanqi Zhong, Yi Zheng, Zhiqiang Ma, Xiaoxian Song, Ruihuan Zhang, Bao Liu, Yanhu Zhang, Zhengbao Yang   +9 more
wiley   +1 more source

Electrode Engineering for High‐Durability Variable‐Emissivity Devices Based on Reversible Copper Electrodeposition

Advanced Science, EarlyView.
An Ir‐based reversible copper electrodeposition variable‐emissivity device achieved over 8000 cycles with just 11% radiative temperature variation decay. This stability stems from Ir's inherent inertness, high conductivity, and strength, which collectively suppress cracking and corrosion.
Runyun He, Tianwen Liu, Liqiang Zhang, Tuoyu Liu, Dan Tang, Wenxia Zhang, Jundong Tao, Tingting Shi, Yijing Song, Haifeng Cheng, Yao Zhang, Dongqing Liu   +11 more
wiley   +1 more source

Temporal and spatial evolution of discrete auroral arcs as seen by Cluster [PDF]

Annales Geophysicae, 2005
Two event studies are presented in this paper where intense convergent electric fields, with mapped intensities up to 1350 mV/m, are measured in the auroral upward current region by the Cluster spacecraft, at altitudes between 3 and 5 Earth radii ...
S. Figueiredo, G. T. Marklund, T. Karlsson, T. Johansson, Y. Ebihara, M. Ejiri, N. Ivchenko, P.-A. Lindqvist, H. Nilsson, A. Fazakerley   +9 more
doaj   +1 more source

Predicting Performance of Hall Effect Ion Source Using Machine Learning

Advanced Intelligent Systems, Volume 7, Issue 3, March 2025.
This study introduces HallNN, a machine learning tool for predicting Hall effect ion source performance using a neural network ensemble trained on data generated from numerical simulations. HallNN provides faster and more accurate predictions than numerical methods and traditional scaling laws, making it valuable for designing and optimizing Hall ...
Jaehong Park, Guentae Doh, Dongho Lee, Youngho Kim, Changmin Shin, Su‐Jin Shin, Young‐Chul Ghim, Sanghoo Park, Wonho Choe   +8 more
wiley   +1 more source

Detection of meteoroid hypervelocity impacts on the Cluster spacecraft: First results [PDF]

Journal of Geophysical Research: Space Physics, 2017
AbstractWe present the first study of dust impact events on one of the Earth‐orbiting Cluster satellites. The events were identified in the measurements of the wide band data (WBD) instrument on board the satellite operating in monopole configuration. Since 2009 the instrument is operating in this configuration due to the loss of three electric probes ...
Jakub Vaverka, Asta Pellinen‐Wannberg, Johan Kero, Ingrid Mann, Alexandre De Spiegeleer, Maria Hamrin, Carol Norberg, Timo Pitkänen   +7 more
openaire   +3 more sources