All living cells are affected deadly by their environmental temperature, a
relatively higher temperature results in a higher metabolic rate, but when
it reaches a threshold, its death acceleration occurs; the same principle is
also valid for the Covid-19 virus. This paper suggests a sample way to its
prevention by a hot cup of water under the noise. The vapor with a high
temperature can make the virus greatly inactive. An optimal height from a
boiling water surface is recommended.
In the present work, the optical properties of GaAs/AlGaAs semiparabolic quantum wells (QWs) are studied under the effect of applied electric field and magnetic field by using the compact-density-matrix method. The energy eigenvalues and their corresponding eigenfunctions of the system are calculated by using the differential method. Simultaneously, the nonlinear optical rectification (OR) and optical absorption coefficients (OACs) are investigated, which are modulated by the applied electric field and magnetic field. It is found that the position and the magnitude of the resonant peaks of the nonlinear OR and OACs can depend strongly on the applied electric field, magnetic field and confined potential frequencies. This gives a new way to control the device applications based on the intersubband transitions of electrons in this system.
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