Analysis on the propagation characteristics of the EM wave in the nonuniform magnetized plasma sheath
A novel FDTD method, Shift-Operator Finite Difference Time-Domain (SO-FDTD) is promoted. Propagator matrix method (PMM) is successfully utilized to study the propagation characteristics of EM waves in the nonuniform magnetized plasma sheath model of blunt cone. The results of the two methods are compared and both of results indicate that the external magnetic field changes propagation characteristics of EM waves in plasma, broadens the transmission bandwidth and improves the transmissivity of EM waves, which can be perfectly applied in re-entry communications.
Simulation of the influence high-frequency (2 MHz) capacitive gas discharge and magnetic field on the plasma sheath near a surface in hypersonic gas flow
The plasma sheath near the surface of a hypersonic aircraft formed under associative ionization behind the shock front shields the transmission and reception of radio signals. Using two-dimensional kinetic particle-in-cell simulations, we consider the change in plasma-sheath parameters near a flat surface in a hypersonic flow under the action of electrical and magnetic fields. The combined action of a high-frequency 2-MHz capacitive discharge, a constant voltage, and a magnetic field on the plasma sheath allows the local electron density to be reduced manyfold.
Private nursing homes: Providing good value?
The well‐documented expansion in the supply of residential and nursing home care over the past decade has been fuelled by public funds. About half of the patients receiving care in private homes are receiving income support towards their fees. There is now growing concern that the substantial amounts involved should represent value for money.