Results 61 to 70 of about 20,111 (287)

Experimental Investigation of a H₂O₂ Hybrid Rocket with Different Swirl Injections and Fuels

Applied Sciences
Hybrid rockets have very interesting characteristics like simplicity, reliability, safety, thrust modulation, environmental friendliness and lower costs, which make them very attractive for several applications like sounding rockets, small launch ...
Manuel Stella, Lucia Zeni, Luca Nichelini, Nicolas Bellomo, Daniele Pavarin, Mario Tindaro Migliorino, Marco Fabiani, Daniele Bianchi, Francesco Nasuti, Christian Paravan, Luciano Galfetti, Attilio Cretella, Rocco Carmine Pellegrini, Enrico Cavallini, Francesco Barato   +14 more
doaj   +1 more source

Lower-hybrid (LH) oscillitons evolved from ion-acoustic (IA)/ion-cyclotron (IC) solitary waves: effect of electron inertia [PDF]

Nonlinear Processes in Geophysics, 2010
Lower-hybrid (LH) oscillitons reveal one aspect of geocomplexities. They have been observed by rockets and satellites in various regions in geospace. They are extraordinary solitary waves the envelop of which has a relatively longer period, while the ...
J. Z. G. Ma, A. Hirose
doaj   +1 more source

The role of combustion research in rocket propulsion [PDF]

, 1961
N/
Penner, S. S.
core  

A Soviet quasi-market for inventions : jet propulsion, 1932–1946 [PDF]

This paper is about how a command system allocated resources under profound uncertainty. The command system was the Soviet economy, the period was Stalin's dictatorship, and the resources were designated for military research & development.
Harrison, Mark
core   +1 more source

Attitude stability and altitude control of a variable-geometry Earth-orbiting solar sail [PDF]

, 2016
A variable-geometry solar sail for on-orbit altitude control is investigated. It is shown that, by adjusting the effective area of the sail at favorable times, it is possible to influence the length of the semi-major axis over an extended period of time.
Ceriotti, Matteo, Felicetti, Leonard, Harkness, Patrick   +2 more
core   +1 more source

The Evolution of Autonomous Systems for Planetary Cave Exploration: A Review

Journal of Field Robotics, EarlyView.
ABSTRACT The exploration of Subsurface Access Points (SAPs), such as lava tubes on the Moon and Mars, has gained significant interest due to their potential as stable environments shielded from surface radiation and temperature extremes. These sites are considered high‐value targets for detecting water and signs of ancient life, and assessing their ...
Sarah Swinton, Daniel Mitchell, Jamie Blanche, Euan McGookin, David Flynn   +4 more
wiley   +1 more source

Mission analysis and systems design of a near-term and far-term pole-sitter mission [PDF]

, 2012
This paper provides a detailed mission analysis and systems design of a near-term and far-term pole-sitter mission. The pole-sitter concept was previously introduced as a solution to the poor temporal resolution of polar observations from highly inclined,
Biggs, James, Ceriotti, Matteo, Heiligers, Jeannette, McInnes, Colin   +3 more
core   +1 more source

Technology requirements of exploration beyond Neptune by solar sail propulsion [PDF]

, 2010
This paper provides a set of requirements for the technology development of a solar sail propelled Interstellar Heliopause Probe mission. The mission is placed in the context of other outer solar systems missions, ranging from a Kuiper Belt mission ...
Axford W. I., Bilbro J. W., Colasurdo G., Colin McInnes, Dachwald B., Dachwald B., Fiehler D. I., Gareth Hughes, Herbeck L., Herbeck L., Kawaguchi J., Leipold M., Lichodziejewshi D., Lyngvi A., Macdonald M., Malcolm Macdonald, Mann T., Matloff G. L., McEachen M. E., Murphy D. M., Rogan J., Sauer C., Sleight D. W., Sweetser T. H., Vulpetti G., Wertz J. R., West J. L., Williams D. R., Yen C. L., Young R. M., Zurbuchen T. H.   +30 more
core   +1 more source

Sampling, Mobility, and Anchoring in Small‐Body Sampling Robots: A Comprehensive Review

SmartBot, EarlyView.
Small‐body sampling robots are exploration systems that perform contact, sampling, and stable operations on microgravity bodies such as asteroids and comets. The authors review representative robot architectures and key technologies, focusing on the mechanisms, evolution, and coupling of sampling, mobility, and anchoring.
Yurui Shen, Yixin Zhu, Mingxia Bao, Ting Zhang, Jun Wu, Jingbin Hao, Dezheng Hua, Xinhua Liu   +7 more
wiley   +1 more source

Analytical control laws for interplanetary solar sail trajectories with constraints [PDF]

, 2008
An indirect method is used to obtain an analytical control law for a spacecraft with a low-thrust propulsion system which is constituted by a solar sail coupled with a solar electric thruster. Constraints on the control inputs for such as the system need
McInnes, C.R., Uchiyama, Kenji
core