Results 101 to 110 of about 608,631 (290)
From Low Thrust to Solar Sailing: A Homotopic Approach [PDF]
, 2016 This paper describes a novel method to solve solar-sail minimum-time-of-flight optimal control problems starting from a low-thrust solution. The method is based on a homotopic continuation. This technique allows to link the low-thrust with the solar-sail
Ceriotti, Matteo +2 more
core
Advanced Functional Materials, EarlyView.The pyrene and ether groups are incorporated into the covalent triazine polymer (CTP) structure. The synergistic effect of the two functional groups endows CTP with better electron transfer, light absorption, and oxygen activation properties. An impressive apparent quantum yield (13.2% @420 nm) and a remarkable solar‐to‐chemical conversion efficiency ...
Chong Wang +10 more
wiley +1 more source
A thrust to trust minimum thrust
We determine the minimum value of thrust for a number of N-particle configurations. For N=5 in three dimensions an exact result is found for the first time. For larger N we obtain numerical results through optimisation. When a definite value cannot be reliably identified, the results are analysed in the context of Extreme Value Theory, using a Maximum ...
openaire +2 more sources
Thrust stand evaluation of engine performance improvement algorithms in an F-15 airplane [PDF]
An investigation is underway to determine the benefits of a new propulsion system optimization algorithm in an F-15 airplane. The performance seeking control (PSC) algorithm optimizes the quasi-steady-state performance of an F100 derivative turbofan ...
Conners, Timothy R.
core +1 more source
Low Thrust Augmented Spacecraft Formation-Flying [PDF]
, 2015 Ballistic spacecraft formation-flying with zero thrust has great utility, but it is limited to a comparatively small set of relative trajectories.
Arnot, Callum S., McInnes, Colin R.
core
Unprecedented Spin‐Lifetime of Itinerant Electrons in Natural Graphite Crystals
Advanced Functional Materials, EarlyView.Graphite exhibits extraordinary spintronic potential, with electron spin lifetimes reaching 1,000 ns at room temperature ‐ over 100 times longer than graphene‐based devices. Magnetic resonance spectroscopy reveals strong anisotropy: out‐of‐plane spins live 50 times longer than their in‐plane counterparts.
Bence G. Márkus +5 more
wiley +1 more source
EXPERIMENTAL RESEARCH REGARDING FORCES AND MOMENTS WICH APPEAR AT PROCESSING X17CRNI16-2 MARTENSITIC STAINLESS STEEL [PDF]
Fiabilitate şi Durabilitate, 2015 This paper main goal is to measure axial forces (thrust) and moments at stainless steel drill process, in particular the processing of stainless steel X17CrNi16-2 SR EN 10088- 4 DIN 17440.
Leonard Marius CIUREZU GHERGHE +1 more
doaj
Airflow calibration and exhaust pressure/temperature survey of an F404, S/N 215-109, turbofan engine [PDF]
A General Electric F-404 turbofan engine was calibrated for thrust and airflow at the NASA Lewis Propulsion System Laboratory in support of future flight tests of the X-29 aircraft.
Burns, Maureen E. +1 more
core +1 more source
Grain Boundary Space Charge Engineering of Solid Oxide Electrolytes: Model Thin Film Study
Advanced Functional Materials, EarlyView.This study demonstrates unprecedented control of grain boundary electrical properties in solid electrolytes. Selective diffusion of cations through grain boundaries in thin films enables 12 orders of magnitude variation in ionic resistance, proving that systematic chemical modification of grain boundary electrical properties is feasible.
Thomas Defferriere +5 more
wiley +1 more source
Design of an Axial-Type Magnetic Gear with Auxiliary Flux-Enhancing Structure
EnergiesIn this paper, a new axial-type magnetic gear with an auxiliary flux-enhancing structure (AFS-AMG) is proposed. Compared to conventional AMGs, it has a higher torque density and higher permanent magnet (PM) utilization factor.
Fang Li, Hang Zhao, Xiangdong Su
doaj +1 more source