Results 21 to 30 of about 27,038 (175)

Development of low-thrust solid rocket motors for small, fast aircraft propulsion [PDF]

open access: yes, 2020
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, May, 2020Cataloged from the official PDF of thesis.Includes bibliographical references (pages 281-289).Small, uncrewed aerial vehicles (UAVs) are expanding
Vernacchia, Matthew T.
core  

A small-Scale Low-Cost Technology Demonstrator of a reusable Launch Vehicle [PDF]

open access: yes, 2005
Recent years have seen an increasing interest of the scientific community toward the study and development of unmanned automatic vehicles, also in the Reusable Launch Vehicle (RLV) frame. Indeed, a number of unmanned vehicle projects have been devoted to
Grassi, M.   +15 more
core   +1 more source

Flow-induced noise around the a-pillar of an idealized car greenhouse [PDF]

open access: yes, 2002
Due to the successes in reducing motor and tire noise as perceived inside cars and trucks, aerodynamically generated noise becomes more and more important.
Lier, L.J. van   +11 more
core   +1 more source

Implicit Large-Eddy Simulation of Solid Rocket Motors using the Immersed Boundary Method [PDF]

open access: yes, 2021
We explore the potential of the immersed boundary (IB) method to predict pressure oscillations in solid rocket motors (SRM) by performing three-dimensional, high-fidelity simulations of two different configurations, including a small, laboratory-scale ...
Di Mascio A.   +7 more
core   +1 more source

Bioinspired Energy Harvesting from Atmospheric Phenomena for Small Unmanned Aerial Vehicles [PDF]

open access: yes, 2020
This Paper discusses energy harvesting from atmospheric phenomena for small unmanned aerial vehicles, theoretically through simulations and practically through experimental flights.
Moschetta, Jean-Marc   +2 more
core   +1 more source

Diseño de la planta motriz eléctrica para la avioneta Diamond DA50-RG [PDF]

open access: yes, 2022
En la actualidad la aviación se ha encaminado en la búsqueda de alternativas que reduzcan el impacto ambiental provocado por la quema de combustibles fósiles.
Vargas Velasco, Diego Fernando
core   +1 more source

Variaciones geométricas de hélices para pequeños cuadricópteros: Estudio experimental [PDF]

open access: yes, 2022
En el presente estudio se evalúa el efecto en el empuje producido y el nivel de ruido emitido por una hélice cuando se le realizan variaciones geométricas a su diseño.
Páez Coneo, Jennifer
core   +1 more source

From the Discovery of the Giant Magnetocaloric Effect to the Development of High‐Power‐Density Systems

open access: yesAdvanced Materials Technologies, EarlyView.
The article overviews past and current efforts on caloric materials and systems, highlighting the contributions of Ames National Laboratory to the field. Solid‐state caloric heat pumping is an innovative method that can be implemented in a wide range of cooling and heating applications.
Agata Czernuszewicz   +5 more
wiley   +1 more source

CUSTARD (Cranfield University Space Technology Advanced Research Demonstrator) - A Micro-System Technology Demonstrator Nanosatellite. Summary of the Group Design Project MSc in Astronautics and Space Engineering. 1999-2000, Cranfield University [PDF]

open access: yes, 2003
CUSTARD (Cranfield University Space Technology And Research Demonstrator) was the group design project for students of the MSc in Astronautics and Space Engineering for the Academic Year 1999/2000 at Cranfield University. The project involved the initial
Turner, Ray, Hobbs, Stephen
core  

Terahertz Channel Modeling, Estimation and Localization in RIS‐Assisted Systems

open access: yesAdvanced Electronic Materials, EarlyView.
Reconfigurable intelligent surfaces have become a recent intensive research focus. Based on practical applications, channel strategies for RIS‐assisted terahertz wireless communication systems are categorized into three different types: channel modeling, channel estimation, and channel localization.
Hongjing Wang   +9 more
wiley   +1 more source

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