When the stoichiometric proportion of Cu in Ca4 − xCuxTi4O12 polycrystalline ceramics is decreased from 3 to 2 and then to 1, the room-temperature permittivity is reduced by one order of magnitude during each step. Ca/Cu atomic disorder is observed only in some grains of Ca3CuTi4O12 single-phase polycrystalline ceramics, and the disorder is not the origin of the giant permittivity in CaCu3Ti4O12. Quantitatively, the permittivity magnitude is related to the mole ratio of polaronlike 3d electrons from Cu ions.
In this paper a new MR damper presents, every stage coil connection is independent. The fluid channel congestion and single axial magnetic field problems, existing on the old MR damper worked under the high impact load were solved. With this connection type, MR damper can generate an axial time–varying magnetic field with different input current every stage. The MR damper’s electromagnetic model was built, and the simulation analysis of new and old MR damper under impact load based on the PID control algorithm was finished. According to the simulation results, compared the anti-impact-load performance between new and old damper. The results show that working on the same impact load, the newly designed MR damper can reduce the displacement and the energy consumption simultaneously compared to the prior damper.
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