In the personalized printing technology field printing watermark has a wide range of applications, using watermark varnish to achieve watermark effect has become a new research hot spots.

印刷水印在个性化印刷技术领域有着广泛的应用前景，水印光油实现水印效果已成为印刷水印研究的新热点。

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High electron mobility transistors (HEMT) is one of field effect transistors, which is made by modulation doped heterostructure technology and possess super high electron mobility.

高电子迁移率晶体管(HEMT)是利用异质结和调制掺杂技术制成的具有超高迁移率的场效应晶体管。

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Its include virtual assembly, model teaching, flow field display, test-run experiment. The system make use of the technology of virtual let the teaching effect visualize, real time, reality.

该系统由虚拟装配、模化教学、流场显示、试车实验四大部分组成，该系统利用虚拟现实技术使得发动机教学效果达到了形象、实时、逼真。

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