Results 111 to 120 of about 71,257 (331)

System Design and Launch of a Hybrid Rocket with a Star-Fractal Swirl Fuel Grain Toward an Altitude of 15 km

open access: yesApplied Sciences
To achieve low-cost and on-demand launches of microsatellites, the authors have been researching and developing a micro hybrid rocket since 2014. In 2018, a ballistic launch experiment was performed using the developed hybrid rocket, where it reached an ...
Atsushi Takano   +10 more
doaj   +1 more source

Study of Hot Gas Pressurizing System Tank and Liquid Rocket Engine Interaction by Dynamic Simulation [PDF]

open access: yesفصلنامه علوم و فناوری فضایی, 2013
Providing of sufficient input pressure of pumps is Pressurizing system tank mission. In structure of objective propulsion system, pressurizing system of fuel tank is hot gas kind that is feeding with engine which caused of operation relational.
H. R. Ali Mohammady   +4 more
doaj  

RETSCP-A computer program for analysis of rocket engine thermal strains with cyclic plasticity [PDF]

open access: yes, 1974
Finite element program employs three-dimensional isoparametric element for analysis of rocket engine thermal strains with cyclic ...
Miller, R. W.
core   +2 more sources

Effects of Galactic Irradiation on Thermal and Electronic Transport in Tungsten

open access: yesphysica status solidi (b), EarlyView.
This atomic‐scale study reveals how low‐to‐mid‐energy space irradiation alters tungsten's thermal and electronic behavior, even at low defect levels. Focusing on vacancy sites in bulk and near grain boundaries, it employs two novel approaches: site‐projected thermal conductivity and the N2$^{2}$ method for the thermal and electronic response analysis ...
Chinonso Ugwumadu   +2 more
wiley   +1 more source

Embedded expert system for space shuttle main engine maintenance [PDF]

open access: yes
The SPARTA Embedded Expert System (SEES) is an intelligent health monitoring system that directs analysis by placing confidence factors on possible engine status and then recommends a course of action to an engineer or engine controller.
Homsley, T.   +5 more
core   +1 more source

Dual-fuel, dual-mode rocket engine [PDF]

open access: yes, 1989
The invention relates to a dual fuel, dual mode rocket engine designed to improve the performance of earth-to-orbit vehicles. For any vehicle that operates from the earth's surface to earth orbit, it is advantageous to use two different fuels during its ...
Martin, James A.
core   +1 more source

The Effect of Tip Design on Technological Performance During the Exploration of Earth, Lunar, and Martian Soil Environments

open access: yesJournal of Field Robotics, EarlyView.
ABSTRACT This paper investigates the penetration performance of soil‐burrowing probes with different tip designs during shallow‐depth penetration in various media, including terrestrial soils (Hostun sand) and well‐characterized planetary soil simulants (LHS‐1 Lunar regolith simulant and MGS‐1 Martian regolith simulant).
Serena Rosa Maria Pirrone   +4 more
wiley   +1 more source

Linear quadratic servo control of a reusable rocket engine [PDF]

open access: yes
A design method for a servo compensator is developed in the frequency domain using singular values. The method is applied to a reusable rocket engine.
Musgrave, Jeffrey L.
core   +1 more source

Stairway to impact or highway to failure? A cognitive perspective on business model design processes in nascent sustainable ventures

open access: yesStrategic Entrepreneurship Journal, EarlyView.
Abstract Research Summary Sustainable new ventures seeking to tackle grand challenges such as climate change or biodiversity loss through new business models face the difficult task of reconciling social and ecological goals with profit. To provide a better understanding of how founders balance such tensions and develop viable business models, this ...
Eduard Esau   +4 more
wiley   +1 more source

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