By applying Bogoliubovs ineguality to double-exchange(DE) ladders, we show that the ferromagnetic(FM) order is absent in the new DE systems at finite temperatur
An extended effective potential (EEP) method is proposed to calculate the spin tunnelling splitting of a single-domain ferromagnetic grain. By adding a phase fa
A unified model of magnetic extraction of spin energy from a black hole is discussed based on the theory of black hole magnetosphere. The magnetic extracting po
We present an alteative approach to calculate the sound field of ultrasonic transducers. The distribution function of sources is expanded into the superposition