一类高阶差分方程非负解的全局行为(英文)

This paper is concerned with the following nonlinear difference equation:x_n+1=sum from i=1 to l A_six_n-si/B+C multiply from j=1 to k x_n-tj +D_xn,n=0,1,…（1.1）.The more simple suffcient conditions of asymptotic stability are obtained by using a smart technique,which extends and includes partially corresponding results obtained in the references [6-9].The global behavior of the solutions is investigated.In addition,in order to support analytic results,some numerical simulations to the special equations are presented.     

Resonant detection of terahertz radiation utilizing plasma waves in high-electron-mobility transistors

This paper theoretically studies the high-electron-mobility transistor （HEMT） driven by the terahertz radiation. It calculates the gate-to-source/drain admittance and the detection responsivity of the HEMT as a function of the signal frequency. It finds that the peaks of the admittances and the responsivity show redshift, and the heights of the peaks decrease with increasing the lengths of the source-to-gate and gate-to-drain spacing. Such phenomena may be useful in designing different HEMTs by utilizing the effects associated with the plasma oscillations excitation.