The effects of substrate temperature on ZnO-based resistive random access memory devices

Ag/ZnO/Zn/Pt structure resistive switching devices are prepared by radio frequency magnetron sputtering.The ZnO thin films are grown at room temperature and 400 C substrate temperature,respectively.By comparing the data,we find that the latter device displayed better stability in the repetitive switching cycle test,and the resistance ratio between a high resistance state and a low resistance state is correspondingly increased.After 104-s storage time measurement,this device exhibits a good retention property.Moreover,the operation voltages are very low:-0.3 V/-0.7 V(OFF state) and 0.3 V(ON state).A high-voltage forming process in the initial state is not required,and a multistep reset process is demonstrated.     

Study on the electromagnetic propertiesof a coated radar absorbent

The sol-gel method is used to fabricate Fe crystalline powders coated with SiO2.By controlling the molar ratio R of diluted water to tetraethoxysilane(TEOS),Fe powders coated with SiO2 with different morphological characteristics are fabricated.The influence of the core diameter on electromagnetic parameters is investigated.The effect of the amount of the coating material SiO2 on electromagnetic parameters is given.Radar wave absorbing properties of Fe coated with SiO2 and TiO2 respectively are compared.     

可见光隐身涂料设计

根据颗粒粒径与波长相比的不同情形，分别用粗粒子理论、细粒子理论和桥理论求得颗粒的 光散射系数和吸收系数，从而得到含颗粒涂料的漫反射率.讨论了涂料参数如黏结剂和颗粒 的光学常数、颗粒粒径和体积比等对漫反射率的影响.并以含钛白粉颗粒的涂料为例，介绍 了可见光隐身涂料的计算机设计方法. 关键词： 非均匀涂料 涂料设计 可见光隐身