The experimental results showed that the main mode of the radiation was the TM_(01) mode, and the microwave power exceeded 500 MW, with an power efficiency of above 3%, a radiation frequency of about 3.6 GHz, and a pulse width of over 20 ns.
Result indicated that on the condition of electric field with 10kHz~18GHz radiation frequency, 20~60V/m field strength, the electric igniter can meet with the anti-RF demands of weapon system. The low pass filter can effectively decrease and eliminate the radio-frequency interference of some frequency band, ensure the anti-RF ability of sensitive electric igniter, and the performance of electric igniter isn’t change.
Virtual cathode oscillation frequency is in agreement with the empiric expression (1～2π1/2 )ωpeb. Up to 10% of microwave efficiency is gained. In addition, dependence of radiation frequency and efficiency on external magnetic field, electron beam intensity, electron energy and beam radius is studied through simulation calculation.
2. We theoretically study the high-electron-mobility transistor driven by the terahertz radiation, and calculate the gate-to-source/drain admittance and the detection responsivity of the HEMT as a function of the signal frequency.
The response is proportional to signal power and has three characteristic frequency regions depending on whether the internal self generated Josephson frequency, w\-0 , is larger than, equal to, or smaller than the signal frequency, w .
The response is proportional to signal power and has three characteristic frequency regions depending on whether the internal self generated Josephson frequency, w 0 is larger than, equal to, or smaller than the signal frequency, w .
It is found that E1s, E2s andE2s- E1s decrease with an increasing radiation intensity or with decreasingradiation frequency, which implies that an intense THz fields can enhanceionization of dopants in semiconductors.
Methods Mice were exposed to electromagnetic fields with frequency of 935 MHz and power density of(0 μW)/cm~2,(570 μW/cm~2),(1 400 μW/cm~2) for 35 days(2 h/day). By the end of five weeks the mice were sacrificed,the testis and epididymis were severed and weighed. And the count,motility and morphology of sperm in epididymis were investigated.
For the same simulated explosion, a study is made of the importance of the spectral dependence of the absorption coefficient on the radiation frequency.
Carbon-13 concentrations in the product and MPD yields were measured depending on the laser radiation frequency and Freon 22 and bath gas (nitrogen) pressure.
The Effect of Laser Radiation Frequency on the IR Multiphoton Dissociation of Triethylsilane
The dependences of the HF* luminescence intensity on the distance Δx between the region in which molecules were excited and the surface and on the laser radiation frequency at different values of Δx were obtained.
A comparative study of the effect of IR laser radiation frequency on the yield of secondary reactions and luminescence intensity as functions of the laser pulse energy upon IR multiphoton dissociation of triethylsilane was performed.
A detailed discussion is made on phase-space motion equations and radiation field equations for free-electrons near the magnetic resonance in the axial and helical magnetic fields. Red-shift spectral broadening and gain enhancement for free-electron radiation are obtained near magnetic resonance. Our theory is applicable to variable periodic and taper helical wiggler fields.
The electromagnetic induced conformation transformations of biological macromolecules are discussed from the quantum theory of interactions between atoms and radiation fields. Based on the proposed theory, the nonthermal microwave resonances phenomena in living cells are explained.