scholarly journals The System Science Development of Local Time‐Dependent 40‐keV Electron Flux Models for Geostationary Orbit

Space Weather ◽  
2019 ◽  
Vol 17 (6) ◽  
pp. 894-906 ◽  
Author(s):  
R. J. Boynton ◽  
O. A. Amariutei ◽  
Y. Y. Shprits ◽  
M. A. Balikhin
Keyword(s):  
Local Time ◽  
Electron Flux ◽  
Time Dependent ◽  
Geostationary Orbit ◽  
System Science

scholarly journals Inclusion of a time-dependent, non-local convection theory in a stellar evolution code

2006 ◽  
Vol 2 (S239) ◽  
pp. 314-316 ◽  
Author(s):  
Achim Weiss ◽  
Martin Flaskamp
Keyword(s):  
Velocity Field ◽  
Local Time ◽  
Stellar Evolution ◽  
Time Dependent ◽  
Test Cases ◽  
The Sun ◽  
Specific Test ◽  
Non Local ◽  
Convective Boundaries

AbstractThe non-local, time-dependent convection theory of Kuhfuß (1986) in both its one- and three-equation form has been implemented in the Garching stellar evolution code. We present details of the implementation and the difficulties encountered. Specific test cases have been calculated, among them a 5 M⊙ star and the Sun. These cases point out deficits of the theory. In particular, the assumption of an isotropic velocity field leads to too extensive overshooting and has to be modified at convective boundaries. Some encouraging aspects are indicated as well.

Heat Transfer Analysis of Laminar Pulsating Flow in a Rectangular Channel Using Infrared Thermography

2021 ◽  
Author(s):  
Richard Blythman ◽  
Sajad Alimohammadi ◽  
Nicholas Jeffers ◽  
Darina B. Murray ◽  
Tim Persoons
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Analytical Solution ◽  
Local Time ◽  
Rectangular Channel ◽  
Pulsating Flow ◽  
Time Dependent ◽  
Heat Transfer Analysis ◽  
Flux Boundary Condition ◽  
Hydrodynamic Behaviour

Abstract While numerous applied studies have successfully demonstrated the feasibility of unsteady cooling solutions, a consensus has yet to be reached on the local instantaneous conditions that result in heat transfer enhancement. The current work aims to experimentally validate a recent analytical solution (on a local time-dependent basis) for the common flow condition of a fully-developed incompressible pulsating flow in a uniformly-heated vessel. The experimental setup is found to approximate the ideal constant heat flux boundary condition well, especially for the decoupled unsteady scenario where the amplitude of the most significant secondary contributions (capacitance and lateral conduction) amounts to 1.2% and 0.2% of the generated heat flux, respectively. Overall, the experimental measurements for temperature and heat flux oscillations are found to coincide well with a recent analytical solution to the energy equation by the authors. Furthermore, local time-dependent heat flux enhancements and degradations are observed to be qualitatively similar to those of wall shear stress from a previous study, suggesting that the thermal performance is indeed influenced by hydrodynamic behaviour.

scholarly journals System Identification of Local Time Electron Fluencies at Geostationary Orbit

2020 ◽  
Vol 125 (11) ◽  
Author(s):  
R. J. Boynton ◽  
H. Aryan ◽  
A. P. Dimmock ◽  
M. A. Balikhin
Keyword(s):  
System Identification ◽  
Local Time ◽  
Geostationary Orbit

FORCED RESPONSE OF STRUCTURAL DYNAMIC SYSTEMS WITH LOCAL TIME-DEPENDENT STIFFNESSES

2000 ◽  
Vol 237 (5) ◽  
pp. 761-773 ◽  
Author(s):  
R. DELTOMBE ◽  
D. MORAUX ◽  
G. PLESSIS ◽  
P. LEVEL
Keyword(s):  
Local Time ◽  
Dynamic Systems ◽  
Forced Response ◽  
Time Dependent ◽  
Structural Dynamic

scholarly journals Specification of > 2 MeV electron flux as a function of local time and geomagnetic activity at geosynchronous orbit

Space Weather ◽  
2014 ◽  
Vol 12 (7) ◽  
pp. 470-486 ◽  
Author(s):  
Yi-Jiun Su ◽  
Jack M. Quinn ◽  
W. Robert Johnston ◽  
James P. McCollough ◽  
Michael J. Starks
Keyword(s):  
Local Time ◽  
Geomagnetic Activity ◽  
Electron Flux ◽  
Geosynchronous Orbit
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