晶体三极管的放大演示实验

晶体三极管的放大演示实验熊晓明（吉林省教育学院长春１３００２２）晶体三极管的放大，是高中物理教学中的难点．一般演示实验都是在一个晶体二极管收音机的基础上，加接在由一个晶体三极管组成的放大器进行一次放大，从而说明晶体三极管有放大作用．由于学生初次接触无...     

A lightweight symmetric image encryption cryptosystem in wavelet domain based on an improved sine map

In the era of big data, the number of images transmitted over the public channel increases exponentially. As a result,it is crucial to devise the efficient and highly secure encryption method to safeguard the sensitive image. In this paper, an improved sine map(ISM) possessing a larger chaotic region, more complex chaotic behavior and greater unpredictability is proposed and extensively tested. Drawing upon the strengths of ISM, we introduce a lightweight symmetric image encryption cryptosystem ...     

Temperature Dependence of Electrical Characteristics in Indium-Zinc-Oxide Thin Film Transistors from 10 K to 400 K

The transfer characteristics of amorphous indium-zinc-oxide thin film transistors are measured in the temperature range of 10–400 K. The variation of electrical parameters(threshold voltage, field effect mobility, sub-threshold swing, and leakage current) with decreasing temperature are then extracted and analyzed. Moreover, the dominated carrier transport mechanisms at different temperature regions are investigated. The experimental data show that the carrier transport mechanism may change from trap-limited conduction to variable range hopping conduction at lower temperature. Moreover, the field effect mobilities are also extracted and simulated at various temperatures.