Regional Gravity Field Model of Egypt Based on Satellite and Terrestrial Data
Sign Up to like & getrecommendations! Published in 2018 at "Pure and Applied Geophysics"
DOI: 10.1007/s00024-018-1982-y
Abstract: This study presents a recent combined regional gravity field model over Egypt, developed by integrating satellite and terrestrial data via applying the remove-compute-restore (RCR) principle and the least-squares collocation (LSC) procedure. A high-resolution digital terrain… read more here.
Keywords: combined regional; model; regional gravity; terrestrial data ... See more keywords
Earth’s gravity field modelling based on satellite accelerations derived from onboard GPS phase measurements
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Geodesy"
DOI: 10.1007/s00190-017-1009-y
Abstract: GPS data collected by satellite gravity missions can be used for extracting the long-wavelength part of the Earth’s gravity field. We propose a new data processing method which makes use of the ‘average acceleration’ approach… read more here.
Keywords: field modelling; earth gravity; field; satellite accelerations ... See more keywords
Divergence-free spherical harmonic gravity field modelling based on the Runge–Krarup theorem: a case study for the Moon
Sign Up to like & getrecommendations! Published in 2018 at "Journal of Geodesy"
DOI: 10.1007/s00190-018-1177-4
Abstract: Recent numerical studies on external gravity field modelling show that external spherical harmonic series may diverge near or on planetary surfaces. This paper investigates an alternative solution that is still based on external spherical harmonic… read more here.
Keywords: field modelling; spherical harmonic; runge krarup; gravity ... See more keywords
High Performance Clocks and Gravity Field Determination
Sign Up to like & getrecommendations! Published in 2017 at "Space Science Reviews"
DOI: 10.1007/s11214-017-0431-z
Abstract: Time measured by an ideal clock crucially depends on the gravitational potential and velocity of the clock according to general relativity. Technological advances in manufacturing high-precision atomic clocks have rapidly improved their accuracy and stability… read more here.
Keywords: height systems; field; clock; high performance ... See more keywords
HUST-Grace2016s: A new GRACE static gravity field model derived from a modified dynamic approach over a 13-year observation period
Sign Up to like & getrecommendations! Published in 2017 at "Advances in Space Research"
DOI: 10.1016/j.asr.2017.04.026
Abstract: Abstract The modified dynamic approach, where the observation vector and design matrix of observation equation are simultaneously filtered by empirical parameters, is implemented in this study. Using approximately 13 years (spanning from January 2003 to April… read more here.
Keywords: observation; hust grace2016s; grace; model ... See more keywords
Simulation-based evaluation of a cold atom interferometry gradiometer concept for gravity field recovery
Sign Up to like & getrecommendations! Published in 2017 at "Advances in Space Research"
DOI: 10.1016/j.asr.2017.12.005
Abstract: Abstract The prospects of future satellite gravimetry missions to sustain a continuous and improved observation of the gravitational field have stimulated studies of new concepts of space inertial sensors with potentially improved precision and stability.… read more here.
Keywords: cold atom; atom interferometry; field; gradiometer ... See more keywords
Impact of a novel hybrid accelerometer on satellite gravimetry performance
Sign Up to like & getrecommendations! Published in 2019 at "Advances in Space Research"
DOI: 10.1016/j.asr.2019.01.034
Abstract: Abstract The state-of-the-art electrostatic accelerometers (EA) used for the retrieval of non-gravitational forces acting on a satellite constitute a core component of every dedicated gravity field mission. However, due to their difficult-to-control thermal drift in… read more here.
Keywords: performance; hybrid accelerometer; gravity field;
Nitrogen-Doped Graphene Foam as a Metal-Free Catalyst for Reduction Reactions under a High Gravity Field
Sign Up to like & getrecommendations! Published in 2020 at "Engineering"
DOI: 10.1016/j.eng.2019.12.018
Abstract: Abstract Herein, we report on the effect of a high gravity field on metal-free catalytic reduction, taking the nitrobenzene (NB) reduction and methylene blue (MB) degradation as model reactions in a high-gravity rotating tube reactor… read more here.
Keywords: reduction; gravity; metal free; high gravity ... See more keywords
A High-Resolution Earth’s Gravity Field Model SGG-UGM-2 from GOCE, GRACE, Satellite Altimetry, and EGM2008
Sign Up to like & getrecommendations! Published in 2020 at "Engineering"
DOI: 10.1016/j.eng.2020.05.008
Abstract: Abstract This paper focuses on estimating a new high-resolution Earth’s gravity field model named SGG-UGM-2 from satellite gravimetry, satellite altimetry, and Earth Gravitational Model 2008 (EGM2008)-derived gravity data based on the theory of the ellipsoidal… read more here.
Keywords: model sgg; sgg ugm; satellite altimetry; gravity ... See more keywords
Signature of Phobos’ interior structure in its gravity field and libration
Sign Up to like & getrecommendations! Published in 2019 at "Icarus"
DOI: 10.1016/j.icarus.2018.11.022
Abstract: Abstract The interior of the Martian moon Phobos has not been precisely determined yet, in spite of space missions sent at close distance to the body. The current measurements (imagery, astrometric, etc.) lead to controversial… read more here.
Keywords: stickney; mass; porosity; heterogeneity ... See more keywords
The gravity field and interior structure of Dione
Sign Up to like & getrecommendations! Published in 2020 at "Icarus"
DOI: 10.1016/j.icarus.2020.113713
Abstract: Abstract During its mission in the Saturn system, Cassini performed five close flybys of Dione. During three of them, radio tracking data were collected during the closest approach, allowing estimation of the full degree-2 gravity… read more here.
Keywords: topography; dione; field interior; gravity ... See more keywords