Results 81 to 90 of about 457,205 (201)
A Homotopy-Based Method for Optimization of Hybrid High-Low Thrust Trajectories [PDF]
, 2014 Space missions require increasingly more efficient trajectories to provide payload transport and mission goals by means of lowest fuel consumption, a strategic mission design key-point.
Ceriotti, Matteo, Sullo, Nicola
core
SensorsBackground: Flywheel resistance training has gained popularity due to its ability to induce eccentric overload and improve strength and power. This study examined the acute effects of low- (0.025 kg·m2) versus high-inertia (0.10 kg·m2) flywheel deadlifts,
Athanasios Tsoukos +4 more
doaj +1 more source
Electrical engineering & Electromechanics, 2017 Purpose. Calculation and experimental researches of electro-thermal resistibility of the pre-production thin-walled sheet models of outward roof of height technical buildings from stainless steel are easily soiled 12Х18Н10Т to direct action on them ...
M. I. Baranov +2 more
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Helicopter noise research at the Langley V/STOL tunnel [PDF]
The noise generated from a 1/4-scale AH-1G helicopter configuration was investigated in the Langley V/STOL tunnel. Microphones were installed in positions scaled to those for which flight test data were available.
Green, G. C., Hoad, D. R.
core +1 more source
Direct Multi-grid Methods for Linear Systems with Harmonic Aliasing Patterns
, 2009 Multi-level numerical methods that obtain the exact solution of a linear system are presented. The methods are devised by combining ideas from the full multi-grid algorithm and perfect reconstruction filters.
Michelini, Pablo Navarrete
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Blast characteristics of center-initiated cylindrical charge in high-altitude environments
AIP AdvancesThe effects of different high-altitudes on the blast parameters—including peak overpressure and specific impulse—produced by a center-initiated cylindrical charge (CC) were simulated using the AUTODYN software and analyzed through dimensional analysis ...
Rui Li +7 more
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Numerical Simulation of the Behavior of Impulse Gas Seals
Tribology OnlineThis paper presents a numerical simulation of an impulse gas seal. Impulse gas seals are mechanical seals equipped with feeding grooves on the stator and chambers on the rotor.
Noël Brunetière +2 more
doaj +1 more source
BEHAVIOUR OF BACKFILL MATERIALS FOR ELECTRICAL GROUNDING SYSTEMS UNDER HIGH VOLTAGE CONDITIONS [PDF]
Journal of Engineering Science and Technology, 2015 Backfill materials like Bentonite and cement are effective in lowering grounding resistance of electrodes for a considerable period. During lightning, switching impulses and earth fault occurrences in medium and high voltage networks, the grounding ...
S. C. LIM +4 more
doaj
, 2019 We introduce a database of multi-channel recordings performed in an acoustic lab with adjustable reverberation time. The recordings provide information about room impulse responses (RIR) for various positions of a loudspeaker. In particular, the main positions correspond to 4104 vertices of a cube-shaped dense grid within a 46x36x32 cm volume.
Čmejla, Jaroslav +4 more
openaire +2 more sources
On the influence of artificially distorted images in firearm detection performance using deep learning [PDF]
PeerJ Computer ScienceDetecting people carrying firearms in outdoor or indoor scenes usually identifies (or avoids) potentially dangerous situations. Nevertheless, the automatic detection of these weapons can be greatly affected by the scene conditions.
Patricia Corral-Sanz +3 more
doaj +2 more sources