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The field-induced assembly of γ-Fe2O3 nanoparticles under alternating magnetic field of different frequency was investigated. It was found that the assembly was dependent upon the difference between colloidal relaxation time and field period. The same experiments on DMSA-coated γ-Fe2O3 nanoparticles exhibited that the relaxation time may be mainly determined by the magnetic size rather than the physical...
The design parameters and test results of X-band Broadband CW Klystron at IECAS were presented in this paper. Under the beam voltage of 17.5 kV and the beam current of 3.25 A, the klystron KX 4139-5# got output power of 13.7~15.9 kW with efficiency of 24.1~27.9%, gain of 37.1~44.7 dB and bandwidth of 95 MHz. The influence of the distribution of magnetic field on the power-frequency characteristics...
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