Results 51 to 60 of about 309,744 (119)

Cost-effective technology advancement directions for electric propulsion transportation systems in earth-orbital missions [PDF]

open access: yes
The directions that electric propulsion technology should take to meet the primary propulsion requirements for earth-orbital missions in the most cost effective manner are determined.
Regetz, J. D., Jr., Terwilliger, C. H.
core   +1 more source

Research in rocket and jet propulsion [PDF]

open access: yes, 1950
When considering the problems of basic research in rocket and jet propulsion, it is profitable to keep in mind the salient features of rocket- and jet-propulsion engineering.
Tsien, Hsue-Shen
core  

Self-Propulsion of Liquid Marbles: Leidenfrost-Like Levitation Driven by the Marangoni Flow [PDF]

open access: yesarXiv, 2015
Self-propulsion of liquid marbles filled with aqueous alcohol solutions and placed on a water surface is reported. The characteristic of velocity of the marbles is about 0.1 m/s. The phenomenon of self-propulsion is related to the Marangoni solutocapillary flow caused by the condensation of alcohol, evaporated from the liquid marble, on a water surface.
arxiv  

Evaluation of the use of on-board spacecraft energy storage for electric propulsion missions [PDF]

open access: yes
On-board spacecraft energy storage represents an under utilized resource for some types of missions that also benefit from using relatively high specific impulse capability of electric propulsion.
Palmer, F. M., Poeschel, R. L.
core   +1 more source

Identifying candidates for targeted gait rehabilitation: better prediction through biomechanics-informed characterization [PDF]

open access: yes, 2017
BACKGROUND: Walking speed has been used to predict the efficacy of gait training; however, poststroke motor impairments are heterogeneous and different biomechanical strategies may underlie the same walking speed.
Awad, Louis N.   +2 more
core  

Space propulsion systems. Present performance limits and application and development trends [PDF]

open access: yes
Typical spaceflight programs and their propulsion requirements as a comparison for possible propulsion systems are summarized. Chemical propulsion systems, solar, nuclear, or even laser propelled rockets with electrical or direct thermal fuel ...
Buehler, R. D., Lo, R. E.
core   +1 more source

The NASA low thrust propulsion program [PDF]

open access: yes
The NASA OAST Propulsion, Power, and Energy Division supports a low thrust propulsion program aimed at providing high performance options for a broad range of near-term and far-term mission and vehicles.
Bennett, Gary L., Stone, James R.
core   +1 more source

The NASA Electric Propulsion Program [PDF]

open access: yes
The NASA OAST Propulsion, Power, and Energy Division supports an electric propulsion program aimed at providing benefits to a broad class of missions. Concepts which have the potential to enable or significantly benefit space exploration and exploitation
Byers, David C.   +2 more
core   +1 more source

Shuttle orbiter with telescoping main propulsion unit and payload [PDF]

open access: yes, 1993
An improved Space Shuttle with variable internal volume is provided. The Space Shuttle Orbiter includes a telescoping main propulsion unit. This main propulsion unit contains the main rocket engines and fuel tanks and telescopes into the Space Shuttle. A
Macconochie, Ian O.
core   +1 more source

A real time Pegasus propulsion system model for VSTOL piloted simulation evaluation [PDF]

open access: yes
A real time propulsion system modeling technique suitable for use in man-in-the-loop simulator studies was developd. This technique provides the system accuracy, stability, and transient response required for integrated aircraft and propulsion control ...
Creekmore, R.   +2 more
core   +1 more source

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