单晶体管可转换组态放大电路的设计

设计了一种新型的单管可转换组态的放大电路,提出了一种简化的参数折算方法。通过计算三种组态电路的电压放大倍数、输入电阻和输出电阻,并与实测数据进行对比,验证了该方法的准确性,使得电路分析更加简单、高效。这项研究不仅有助于增强学生对三种组态放大电路性能的理解,而且对新工科类课程的教学改革具有重要的参考价值。

提升民营企业家政治素质

民营企业的兴衰成败很大程度上系于民营企业家的自身素质,尤其是民营企业家把握新时代正确发展方向的坚定信心信念、坚持做“有良心有担当的企业”的企业家精神等政治素质,对民营企业健康高质量发展具有关键作用。提升民营企业家政治素质是引领我国民营企业健康高质量发展的紧迫要求。

On Nonlinear Evolution of C-type Instability in Nonparallel Boundary Layers

The process of evolution, especially that of nonlinear evolution, of C-type instability of laminar-turbulent flow transition in nonparallel boundary layers are studied by means of a newly developed method called parabolic stability equations （PSE）. Initial conditions, which are very important for the nonlinear problem, are investigated by computing initial solution of the harmonic waves, modifying the mean-flow-distortion, and giving initial value of TS wave and its subharmonic waves at initial station by solving linear PSE. A numerical method with high-order accuracy are developed in the text, the key normalization conditions in the PSE are satisfied, and nonlinear PSE are solved efficiently and implemented stably by the spatial marching. It has been shown that the computed process of nonlinear evolution of C-type instability in Blasius boundary layer is in good agreement with the experimental results.