Momentum coupling in ionospheric critical ionization velocity experiments*

1993 ◽  
Vol 5 (7) ◽  
pp. 2631-2637 ◽  
Author(s):  
N. Brenning ◽  
O. Bolin
Keyword(s):  
Momentum Coupling ◽  
Ionization Velocity

Momentum coupling in the “CRIT II” critical ionization velocity experiment

1996 ◽  
Vol 101 (A9) ◽  
pp. 19649-19657 ◽  
Author(s):  
K. Liou ◽  
R. B. Torbert ◽  
G. Haerendel
Keyword(s):  
Momentum Coupling ◽  
Ionization Velocity

Momentum coupling effects in a two-phase swirling jet

1997 ◽  
Author(s):  
T. Park ◽  
S. Aggarwal ◽  
V. Katta ◽  
T. Park ◽  
S. Aggarwal ◽  
...  
Keyword(s):  
Coupling Effects ◽  
Two Phase ◽  
Swirling Jet ◽  
Momentum Coupling

Air-Sea Momentum Coupling and Radar Response at High Winds

2007 ◽  
Author(s):  
M. A. Donelan ◽  
H. C. Graber ◽  
B. K. Haus
Keyword(s):  
Momentum Coupling ◽  
High Winds

scholarly journals Optimum parameters for laser launching objects into low Earth orbit

2000 ◽  
Vol 18 (4) ◽  
pp. 661-695 ◽  
Author(s):  
CLAUDE R. PHIPPS ◽  
JAMES P. REILLY ◽  
JONATHAN W. CAMPBELL
Keyword(s):  
Low Earth Orbit ◽  
Laser Source ◽  
Sounding Rocket ◽  
Earth Orbit ◽  
Laser Propagation ◽  
Optimum Parameters ◽  
Ablation Plasma ◽  
Light Concentration ◽  
Momentum Coupling ◽  
Flight Simulations

We derive optimum values of parameters for laser-driven flights into low Earth orbit (LEO) using an Earth-based laser, as well as sensitivity to variations from the optima. These parameters are the ablation plasma exhaust velocity vE and specific ablation energy Q*, plus related quantities such as momentum coupling coefficient Cm and the pulsed or continuous laser intensity that must be delivered to the ablator to produce these values. Different optima are found depending upon whether it is desired to maximize mass m delivered to LEO, maximize the ratio m/M of orbit to ground mass, or minimize cost in energy per gram delivered. Although it is not within the scope of this report to provide an engineered flyer design, a notional, cone-shaped flyer is described to provide a substrate for the discussion and flight simulations. The flyer design emphasizes conceptually and physically separate functions of light collection at a distance from the laser source, light concentration on the ablator, and autonomous steering. Approximately ideal flight paths to LEO are illustrated beginning from an elevated platform. We believe LEO launch costs can be reduced 100-fold in this way. Sounding rocket cases, where the only goal is to momentarily reach a certain altitude starting from near sea level, are also discussed. Nonlinear optical constraints on laser propagation through the atmosphere to the flyer are briefly considered.

scholarly journals Realization of acoustic spin transport in metasurface waveguides

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Yang Long ◽  
Danmei Zhang ◽  
Chenwen Yang ◽  
Jianmin Ge ◽  
Hong Chen ◽  
...  
Keyword(s):  
Acoustic Waves ◽  
Electromagnetic Waves ◽  
Degrees Of Freedom ◽  
Transport Processes ◽  
Angular Momenta ◽  
Transverse Electromagnetic ◽  
Spin Texture ◽  
Momentum Coupling ◽  
Practical Implications ◽  
Spin Momentum

Abstract Spin angular momentum enables fundamental insights for topological matters, and practical implications for information devices. Exploiting the spin of carriers and waves is critical to achieving more controllable degrees of freedom and robust transport processes. Yet, due to the curl-free nature of longitudinal waves distinct from transverse electromagnetic waves, spin angular momenta of acoustic waves in solids and fluids have never been unveiled only until recently. Here, we demonstrate a metasurface waveguide for sound carrying non-zero acoustic spin with tight spin-momentum coupling, which can assist the suppression of backscattering when scatters fail to flip the acoustic spin. This is achieved by imposing a soft boundary of the π reflection phase, realized by comb-like metasurfaces. With the special-boundary-defined spin texture, the acoustic spin transports are experimentally manifested, such as the suppression of acoustic corner-scattering, the spin-selected acoustic router with spin-Hall-like effect, and the phase modulator with rotated acoustic spin.

Sign in / Sign up

Export Citation Format

Share Document