Helioseismic determination of the solar gravitational quadrupole moment [PDF]
, 1998 One of the most well-known tests of General Relativity (GR) results from combining measurements of the anomalous precession of the orbit of Mercury with a determination of the gravitational quadrupole moment of the Sun J_2.
Pijpers, F. P.
core +3 more sources
Enhanced orbit determination for BeiDou satellites with FengYun-3C onboard GNSS data
GPS Solutions, 2017 A key limitation for precise orbit determination of BeiDou satellites, particularly for satellites in geostationary orbit (GEO), is the relative weak geometry of ground stations.
Qile Zhao +6 more
semanticscholar +1 more source
Mechanisms of parasite‐mediated disruption of brain vessels
FEBS Letters, EarlyView.Parasites can affect the blood vessels of the brain, often causing serious neurological problems. This review explains how different parasites interact with and disrupt these vessels, what this means for brain health, and why these processes matter. Understanding these mechanisms may help us develop better ways to prevent or treat brain infections in ...
Leonor Loira +3 more
wiley +1 more source
Suboptimal filtering. Part 2 - Compensation for modeling errors in orbit determination problems Final report [PDF]
Compensation for dynamic and measurement model errors in real time orbit determination ...
Bailie, A. E. +3 more
core +1 more source
Integrated Orbit Determination of FengYun‐3C, BDS, and GPS Satellites
Journal of Geophysical Research: Solid Earth, 2018 Aiming at weather forecast and global climate research, the satellite FengYun‐3C (FY‐3C), as the new generation of China's weather satellites, was launched in 2013. It carries the Global Navigation Satellite Systems Occultation Sounder instrument, a BDS +
Xingxing Li +5 more
semanticscholar +1 more source
Time after time – circadian clocks through the lens of oscillator theory
FEBS Letters, EarlyView.Oscillator theory bridges physics and circadian biology. Damped oscillators require external drivers, while limit cycles emerge from delayed feedback and nonlinearities. Coupling enables tissue‐level coherence, and entrainment aligns internal clocks with environmental cues.
Marta del Olmo +2 more
wiley +1 more source
Analysis of Orbit Accuracy for Non-cooperative Earth-Orbiting Objects
Open Astronomy, 2019 The atmospheric resistance and solar radiation pressure are the main sources of non-gravitational perturbations in orbit determination and prediction of non-cooperative earth-orbiting objects.
Jianrong Chen, Junfeng Li
doaj +1 more source
Performance of the square root information filter for navigation of the Mariner 10 spacecraft [PDF]
The use is described of a sequential least squares filter in the orbit determination for the Mariner Venus-Mercury (Mariner 10) spacecraft. The orbit determination strategy outlining the use of both the sequential filter and a conventional batch filter ...
Christensen, C. S.
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Multiple ETS family transcription factors bind mutant p53 via distinct interaction regions
FEBS Letters, EarlyView.Mutant p53 gain‐of‐function is thought to be mediated by interaction with other transcription factors. We identify multiple ETS transcription factors that can bind mutant p53 and found that this interaction can be promoted by a PXXPP motif. ETS proteins that strongly bound mutant p53 were upregulated in ovarian cancer compared to ETS proteins that ...
Stephanie A. Metcalf +6 more
wiley +1 more source
Comparison of ERBS orbit determination accuracy using batch least-squares and sequential methods [PDF]
The Flight Dynamics Div. (FDD) at NASA-Goddard commissioned a study to develop the Real Time Orbit Determination/Enhanced (RTOD/E) system as a prototype system for sequential orbit determination of spacecraft on a DOS based personal computer (PC).
Doll, C. E. +5 more
core +1 more source