scholarly journals Angular expansion theory turned on its side

2014 ◽  
Vol 14 (10) ◽  
pp. 154-154
Author(s):  
F. Durgin ◽  
Z. Li ◽  
B. Klein
Keyword(s):  
Expansion Theory ◽  
Angular Expansion

Angular Expansion Measurement of the Young and Compact Planetary Nebula V[CLC]y[/CLC] 2-2

1998 ◽  
Vol 115 (6) ◽  
pp. 2466-2474 ◽  
Author(s):  
Haryadi Christianto ◽  
E. R. Seaquist
Keyword(s):  
Planetary Nebula ◽  
Angular Expansion

Representation of the nonideality of electrolyte solutions using the cluster expansion theory

2004 ◽  
Vol 218 (1) ◽  
pp. 77-84 ◽  
Author(s):  
Gui-Wu Lu ◽  
Chun-Xi Li ◽  
Ru Tian ◽  
Zi-Hao Wang ◽  
Wen-Chuan Wang
Keyword(s):  
Cluster Expansion ◽  
Electrolyte Solutions ◽  
Expansion Theory

Analysis of Metamaterial Walls Reverberation Chamber by Using Modal Expansion Theory

2021 ◽  
Author(s):  
Jeudy Kean ◽  
Nathalie Raveu ◽  
Hamza Kaouach ◽  
Kosorl Thourn ◽  
Sokchenda Sreng
Keyword(s):  
Reverberation Chamber ◽  
Modal Expansion ◽  
Expansion Theory

Mode expansion theory and application in step-index multimode fibres for astronomical spectroscopy

2021 ◽  
Author(s):  
Eloy Hernandez ◽  
Martin Roth ◽  
Klaus Petermann ◽  
Andreas Kelz ◽  
Benito Moralejo ◽  
...  
Keyword(s):  
Mode Expansion ◽  
Step Index ◽  
Expansion Theory

 Statistical study of CMEs, lateral overexpansion and SEP events

2021 ◽  
Author(s):  
Alexandros Adamis ◽  
Astrid Veronig ◽  
Tatiana Podladchikova ◽  
Karin Dissauer ◽  
Rositsa Miteva ◽  
...  
Keyword(s):  
Statistical Study ◽  
Solar Energetic Particle ◽  
Early Evolution ◽  
Point Of View ◽  
Time Range ◽  
The Sun ◽  
Lateral Expansion ◽  
Time Profiles ◽  
Angular Expansion

<p><strong>We present a statistical study on the early evolution of coronal mass ejections (CMEs), to better understand the effect of CME (over)- expansion and how it relates to the production of Solar Energetic Particle (SEP) events. We study the kinematic CME characteristics in terms of their radial and lateral expansion, from their early evolution in the Sun’s atmosphere as observed in EUV imagers and coronagraphs. The data covers 72 CMEs that occurred in the time range of July 2010 to September 2012, where the twin STEREO spacecraft where in quasiquadrature </strong><strong>to the Sun-Earth line. From the STEREO point-of-view, the CMEs under study were observed close to the limb. We calculated the radial and lateral height (width) versus time profiles and derived the corresponding peak and mean velocities, accelerations, and angular expansion rates, with particular emphasis on the role of potential lateral overexpansion in the early CME evolution. We find high correlations between the radial and lateral CME velocities and accelerations. CMEs that are associated tend to be located at the high-value end of the distributions of velocities, widths, and expansion rates compared to nonSEP associated events.<br></strong></p>

scholarly journals Effect of control surfaces on the aerodynamic database of the Stratofly hypersonic vehicle

2019 ◽  
Vol 304 ◽  
pp. 02021
Author(s):  
Andrea Flora ◽  
Pasquale Capasso ◽  
Simona Brancaccio ◽  
Paolo Ambrico ◽  
Alessio D’Onofrio ◽  
...  
Keyword(s):  
Vortex Lattice ◽  
Free Stream ◽  
Aerodynamic Coefficients ◽  
Horizon 2020 ◽  
Wide Range ◽  
Aerodynamic Database ◽  
Two Dimensional Flow ◽  
Research Goal ◽  
Expansion Theory ◽  
Control Surfaces

This paper aims at studying the control surfaces of the STRATOFLY project reference aircraft, funded by the European Commission, under the framework of Horizon 2020 plan. The values of aerodynamic coefficients in a wide range of flow free-stream conditions are stored in the aircraft aerodynamic database. The research goal is to update a pre-existent database that was developed with fixed control surfaces using the six control surfaces deflection as input. Different Mach numbers determine different flow regimes: subsonic, transonic, supersonic, and hypersonic. In subsonic, transonic and low supersonic regimes a vortex-lattice solver is used to obtain the global coefficients assuming an unviscous flow on a simplified model. In hypersonic flow a build-up approach is applied: the control surfaces deflection contribution is developed by assuming a two-dimensional flow on the airfoil and by applying shock-expansion theory on the geometry. Then the paper analyses results showing stability and L/D results. The final paragraph focuses on trimmability at cruise Mach. No trimmed solution is obtainable to optimize the propulsive system. The solution proposed to solve this issue is to extend the four elevons: larger elevons are found to be able to trim the vehicle at the desired angle of attack.

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