Results 141 to 150 of about 6,632 (182)

A Survey on Unmanned Surface Vehicles for Disaster Robotics: Main Challenges and Directions. [PDF]

Sensors (Basel), 2019
Jorge VAM, Granada R, Maidana RG, Jurak DA, Heck G, Negreiros APF, Dos Santos DH, Gonçalves LMG, Amory AM.   +8 more
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The Mars Science Laboratory (MSL) Mast cameras and Descent imager: Investigation and instrument descriptions. [PDF]

Earth Space Sci, 2017
Malin MC, Ravine MA, Caplinger MA, Tony Ghaemi F, Schaffner JA, Maki JN, Bell JF, Cameron JF, Dietrich WE, Edgett KS, Edwards LJ, Garvin JB, Hallet B, Herkenhoff KE, Heydari E, Kah LC, Lemmon MT, Minitti ME, Olson TS, Parker TJ, Rowland SK, Schieber J, Sletten R, Sullivan RJ, Sumner DY, Aileen Yingst R, Duston BM, McNair S, Jensen EH.   +28 more
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Enhancing the landing guidance of a reusable launch vehicle by improving genetic algorithm-based deep reinforcement learning using Hybrid Deterministic-Stochastic algorithm. [PDF]

PLoS One
Nugroho L, Andiarti R, Akmeliawati R, Wijaya SK.   +3 more
europepmc   +1 more source

Low-frequency oscillations in the magnetic nozzle of a Helicon Plasma Thruster

Maddaloni D, Bayón-Buján B, Navarro-Cavallé J, Terragni F, Merino M.   +4 more
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Magnetic arch plasma expansion\in a cluster of two ECR plasma sources

Boyé C, Navarro-Cavallé J, Merino M.
europepmc   +1 more source

Environmental impact and sustainability of nanocellulose-based nitrated polymers in propellants. [PDF]

RSC Adv
Ahmad Aljafree NF, Norrrahim MNF, Samsuri A, Wan Yunus WMZ.   +3 more
europepmc   +1 more source

Kif1a and intact microtubules maintain synaptic-vesicle populations at ribbon synapses in zebrafish hair cells. [PDF]

J Physiol
David S, Pinter K, Nguyen KK, Lee DS, Lei Z, Sokolova Y, Sheets L, Kindt KS.   +7 more
europepmc   +1 more source

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Analysis of Airbreathing Hall-Effect Thrusters

Journal of Propulsion and Power, 2011
The principle idea of using air breathing electrical propulsion for a vehicle flying at orbital speed on the edge of Earth’s atmosphere is examined. In this paper, we present a simple model of a Hall Effect thruster in which the propellant is an ambient air.
Leonid Pekker, Michael Keidar
openaire   +1 more source

Kinetic Effects in Hall Thruster Discharge

42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2006
Recent analytical studies and particle-in-cell simulations suggested that the electron velocity distribution function in E×B discharge of annular geometry Hall thrusters is non-Maxwellian and anisotropic. The average kinetic energy of electron motion in the direction parallel to the thruster channel walls (across the magnetic field) is several times ...
I. D. Kaganovich, Y. Raitses, D. Sydorenko, A. Smolyakov   +3 more
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µ-Hall Effect Thruster Characterization

49th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 2011
Results of two methods to characterize a novel micro-Hall effect thruster are presented. The voltage-current characteristics of the thruster during steady state operation are reported. The exhaust plume is characterized using Faraday probe measurements and the beam efficiency is reported.
John-David de La Harpe, Richard Branam, Richard Huffman, Sujeet Paintal, Rachel Tedrake   +4 more
openaire   +1 more source