排序方式: 共有40条查询结果,搜索用时 15 毫秒
22.
23.
24.
SrGdGa3O7:RE(RE=Ce^3 ,Pr^3 ,Tb^3 ) were prepared by traditional solid-state reaction and their luminescence properties in the range of VUV-Vis were investigated. The two broad bands situated at about 177 and 217nm in excitation spectra are attributed to the host lattices absorption, and they have no considerable change when doped different rare earth ions. The f-d transitions of Pr^3 and Tb^3 calculated by the formula gathered by Dorenbos were compared to the experimental results. The excitation spectra also show the sharp Gd^3 excitation line at about 274 nm pointing to an efficient energy transfer from Gd^3 to Pr^3 and Tb^3 . All of the emission spectra present the characteristic emissions of rare earth ions when excited by VUV and UV. 相似文献
25.
针对高速公路入口匝道控制问题所存在的非线性、复杂性和不确定性,在入口匝道控制原理的基础上,设计了一种基于支持向量机的高速公路入口匝道控制器;结合某高速公路交通调研数据,对这一控制器进行了仿真;仿真结果表明了支持向量机可以用于高速公路入口匝道的控制,并能取得较良好的控制效果. 相似文献
26.
基于ATmega16的GPS经纬度数据接收系统 总被引:1,自引:0,他引:1
随着GPS技术的广泛应用,其终端设备的功能越来越多,硬件成本越来越高,减缓了GPS设备的民用普及步伐.本文提出一种以ATmega16单片机为核心的利用Motorola M12模块进行地理定位的低成本经纬度数据接收系统,介绍了ATmega16和M12模块的软硬件接口以及利用M12模块采集定位数据的方法.经测试,系统的单机静态定位精度≤7.81 m,符合民用要求. 相似文献
27.
本文提出了一种开发软PLC梯形图编辑系统的方法。该系统提供了梯形图的编辑、修改、逻辑仿真等功能,实现了梯形图文件的存储及加载过程。为PLC学习提供了良好的编辑和仿真环境。 相似文献
28.
29.
30.