Maneuver Strategy for Active Spacecraft to Avoid Space Debris and Return to the Original Orbit
International Journal of Aerospace Engineering, 2022 During normal operation of the on-orbit spacecraft, if some satellite in a nearby orbit suddenly breaks apart, its debris will threat the safe operation of the on-orbit spacecraft.
Qun Fang +4 more
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The long-term transport and radiative impacts of the 2017 British Columbia pyrocumulonimbus smoke aerosols in the stratosphere [PDF]
Atmospheric Chemistry and Physics, 2021 Interactions of meteorology with wildfires in British Columbia, Canada, during August 2017 led to three major pyrocumulonimbus (pyroCb) events that resulted in the injection of large amounts of smoke aerosols and other combustion products at the local ...
S. Das +6 more
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Aerospace, 2021 The modern trend of developing highly automated aircraft is characterized by a transition from traditional methods and technical solutions to innovative approaches in order to control the system, inceptor and display design.
Alexandr V. Efremov +2 more
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Required Moment Sets: Enhanced Controllability Analysis for Nonlinear Aircraft Models
Applied Sciences, 2021 Attainable moment sets (AMS) are a powerful method to assess aircraft controllability. However, as attainable moment sets only take into account the achievable moment set of the control effectors, they do not assess the required moment set to fulfill the
Max Söpper +3 more
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Trajectory/Path-Following Controller Based on Nonlinear Jerk-Level Error Dynamics
Applied Sciences, 2020 This study proposes a novel, nonlinear trajectory/path-following controller based on jerk-level error dynamics. Therefore, at first the nonlinear acceleration-based kinematic equations of motion of a dynamic system are differentiated with respect to time
Patrick Piprek +3 more
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A machine learning methodology for the generation of a parameterization of the hydroxyl radical [PDF]
Geoscientific Model Development, 2022 We present a methodology that uses gradient-boosted regression trees (a machine learning technique) and a full-chemistry simulation (i.e., training dataset) from a chemistry–climate model (CCM) to efficiently generate a parameterization of tropospheric ...
D. C. Anderson +13 more
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The dynamics of parabolic flight: Flight characteristics and passenger percepts [PDF]
Acta Astronautica, 2008 Flying a parabolic trajectory in an aircraft is one of the few ways to create freefall on Earth, which is important for astronaut training and scientific research. Here we review the physics underlying parabolic flight, explain the resulting flight dynamics, and describe several counterintuitive findings, which we corroborate using experimental data ...
Faisal, Karmali, Mark, Shelhamer
openaire +2 more sources
A new airborne laser-induced fluorescence instrument for in situ detection of formaldehyde throughout the troposphere and lower stratosphere [PDF]
Atmospheric Measurement Techniques, 2015 The NASA In Situ Airborne Formaldehyde (ISAF) instrument is a high-performance laser-based detector for gas-phase formaldehyde (HCHO). ISAF uses rotational-state specific laser excitation at 353 nm for laser-induced fluorescence (LIF) detection of HCHO ...
M. Cazorla +5 more
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Technical note: Constraining the hydroxyl (OH) radical in the tropics with satellite observations of its drivers – first steps toward assessing the feasibility of a global observation strategy [PDF]
Atmospheric Chemistry and Physics, 2023 Despite its importance in controlling the abundance of methane (CH4) and a myriad of other tropospheric species, the hydroxyl radical (OH) is poorly constrained due to its large spatial heterogeneity and the inability to measure tropospheric OH with ...
D. C. Anderson +9 more
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High-Precision Binary Object Detector Based on a BSF-XNOR Convolutional Layer
IEEE Access, 2021 Recently, building an efficient and robust model for object detection has attracted the attention of the vision community. Although binary networks have a fast inference speed, they cannot be used directly on mobile devices such as unmanned aerial ...
Shaobo Wang +4 more
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