排序方式： 共有4条查询结果，搜索用时 6 毫秒
1
1.
一种LED大屏幕控制系统的改进结构 总被引：1，自引：0，他引：1
在分析了LCD大屏幕的系统结构的基础上,介绍了一种改进的LED显示屏幕控制系统,并利用xilinx FPGA芯片XC3S500E实现了该LED大屏幕控制系统。其中对SDRAM乒乓式数据缓存进行了改进,同时提出了一种反γ校正与灰度级调节、颜色调节的算法,结果表明本系统设计出的电路简单,控制方便,屏幕显示稳定,效果佳,成本更低。 相似文献
2.
<正>“俯仰”一词可以追溯到《周易》,书中记载：“古者包牺氏之王天下也,仰则观象于天,俯则观法于地,观鸟兽之文与地之宜,近取诸身,远取诸物,于是始作八卦,以通神明之德,以类万物之情。”[1]由此可见,“俯仰”一词,产生于“天、地、人”整体的关系中,“俯仰”是人与万物产生情感联系的基点,“俯仰”所呈现的视觉和心灵上的空间感和时间感,给了人情感衍生的参照点。 相似文献
3.
本文通过对初中生生物学课堂参与情况的调查及分析,提出了可从发挥教师主导作用、建立和谐的师生关系和改进教学形式等方面入手提高学生的课堂参与度。 相似文献
4.
The Grains containing Oil Inclusions （GOI） data in currently gas/condensate-beating Jurassic and Cretaceous reservoir sandstones of Well Pen 5 （the Mosuowan area of central Junggar Basin, NW China） are generally greater than the empirical threshold line of 5%. This is consistent with the gas-condensate section originally containing a palaeo-oil column. In order to assess the origin of the oil trapped in the oil inclusion and its relationship to the free oil/gas-condensate, a detailed molecular geochemical study was carried out for correlation between the free and inclusion oils. The paleo oil is most likely sourced from the Lower Permian Fengcheng Formation, which generated hydrocarbons primarily during Late Triassic and the oils were later secondarily altered and dysmigrated along faults likely during Late Jurassic-Early Cretaceous. In contrast, the current reservoired oil/gas-condensate mainly derived from the Middle Permian Lower Wuerhe Formation, whose peak generation time last from Late Cretaceous even to the present. This paper showed that integrated oil-bearing fluid inclusion analyses have likely allowed a complex multi-phase charge history to be recognized and resolved with a high degree of confidence. 相似文献
1