Results 41 to 50 of about 54,590 (219)
Journal of Advances in Modeling Earth Systems, 2017 NASA's Goddard Earth Observing System (GEOS) Earth System Model (ESM) is a modular, general circulation model (GCM), and data assimilation system (DAS) that is used to simulate and study the coupled dynamics, physics, chemistry, and biology of our planet.
J. Eric Nielsen +12 more
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Advanced Engineering Materials, EarlyView.Scandium (Sc)‐doped AlCoCrFeMo HEA coatings are fabricated via flame spraying with 0.1, 0.3, and 0.5 wt% Sc additions. Among these, the HEA‐Sc0.3 coating exhibits the highest corrosion resistance, indicated by a more positive corrosion potential and lower current density.
Pankaj Kumar +7 more
wiley +1 more source
Adaptive Fault–Tolerant Position Control of a Hexacopter Subject to an Unknown Motor Failure
International Journal of Applied Mathematics and Computer Science, 2018 This paper presents a fault tolerant position tracking controller for a hexarotor system. The proposed controller has a cascaded structure composed of a position and an attitude control loop.
Falconì Guillermo P. +2 more
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AIP Advances, 2020 An implicit large-eddy simulation method is used to numerically simulate the flowfield around a finite-span rectangular wing in pitch motion. The effect of the reduced frequency (k) on the stability of the leading-edge vortex (LEV) is studied.
JiaoLong Zhang +3 more
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Performance Enhancement by Wing Sweep for High-Speed Dynamic Soaring
Aerospace, 2021 Dynamic soaring is a flight mode that uniquely enables high speeds without an engine. This is possible in a horizontal shear wind that comprises a thin layer and a large wind speed.
Gottfried Sachs +2 more
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Advanced Engineering Materials, EarlyView.This review highlights advances in lightweight, lead‐free polymer nanocomposites for diagnostic X‐ray shielding. By linking filler chemistry, dispersion, architecture, and photon interaction mechanisms, it establishes structure–performance relationships guiding material design.
Aklilu G. Messele +2 more
wiley +1 more source
Attitude Estimation of Skis in Ski Jumping Using Low-Cost Inertial Measurement Units
Proceedings, 2018 This paper presents an approach to estimate the attitude of skis for an entire ski jump using wearable, MEMS-based, low-cost Inertial Measurement Units (IMUs). First of all, a kinematic attitude model based on rigid-body dynamics and a sensor error model
Xiang Fang +2 more
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The NASA Carbon Airborne Flux Experiment (CARAFE): instrumentation and methodology [PDF]
Atmospheric Measurement Techniques, 2018 The exchange of trace gases between the Earth's surface and atmosphere strongly influences atmospheric composition. Airborne eddy covariance can quantify surface fluxes at local to regional scales (1–1000 km), potentially helping to bridge gaps between
G. M. Wolfe +18 more
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Advanced Functional Materials, EarlyView.An all‐in‐one analog AI accelerator is presented, enabling on‐chip training, weight retention, and long‐term inference acceleration. It leverages a BEOL‐integrated CMO/HfOx ReRAM array with low‐voltage operation (<1.5 V), multi‐bit capability over 32 states, low programming noise (10 nS), and near‐ideal weight transfer.
Donato Francesco Falcone +11 more
wiley +1 more source
EASA’s “Open” Category for Military UAS: Opportunities and Limitations in the Field of Airworthiness
Aerospace, 2018 The European Aviation Safety Agency (EASA) plans to establish a sole risk-based set of regulations for drones to grant access to European airspace, thus opening a multibillion-euro market.
Oliver Hirling, Florian Holzapfel
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