基于随机等效采样的高速数据采集系统的设计

随机等效采样实际上是以触发点为时间参考基准对周期快变信号进行采样、存储和重构的技术。随机等效采样的关键在于精确测量触发点与下一个采样时钟间的时间间隔，以及通过等效采样算法确定各次采样数据在信号重建的位置，本文给出了这个时间间隔的测量电路和随机等效算法模型。     

静态工作点稳定的教学设计与实践

静态工作点的稳定是“电子技术基础”课程教学的重点和难点,不易理解与掌握。本文采用了问题链教学方法。通过将授课重点放在理清知识脉络上,层层解开学生学习过程中的疑虑,进而达到使其掌握该知识点的目的。同时,在教授知识过程中逐步培养学生发现问题、分析问题、解决问题的能力。实践表明,该方法使教学效果明显改善。     

甘肃当归新品系DGA2000-02的选育研究

当归新品系DGA2000 02是采用重离子束55 MeV/u 40Ar+15 离子辐照甘肃当归90 01干种子, 按新品种选育程序多年选育而成的。 2005—2007年, 在定西市岷县、 渭源县、 漳县、 陇西县等地当归品系区域试验中, 甘肃当归DGA2000 02平均产鲜当归10 621.5 kg/hm2, 较对照品种（甘肃当归90 01）平均增产鲜当归1 386.0 kg/hm2, 增产率15.0%。 生育期790 d, 茎秆深紫色, 根系黄白色。 测定结果: 总灰分4.2%, 酸不溶性灰分0.4%, 分别优于对照品种16%和33.3%; 浸出物61.4%, 较规定指标提高4.4%; 阿魏酸0.148%, 较规定指标提高2.96倍。 质量显著优于对照品种和2005年版《中国药典》规定指标。 适宜在海拔2 000—2 600 m 、 年降水量500—600 mm的二阴及高寒阴湿生态区栽培。 Angelica sinensis（Oliv）Diels new strain DGA2000 02 was selected successfully by Institute of Modern Physics, Chinese Academy of Sciences, Dryland Farming Research and Extension Center of Dingxi Prefecture, etc. According to the program of new strain selection, this new strain was selected for several years after the dry seeds of Gansu Angelica sinensis（Oliv）Diels 90 01 was irradiated by ions of 55 MeV/u 40Ar+15. During the period of year 2005—2007, region experiments of Angelica sinensis（Oliv）Diels new strain DGA2000 02 were developed in Minxian, Weiyuan, Zhangxian and Longxi etc. Average yield of the fresh DGA2000 02 Angelica was 10 621.5 kg/hm2, and 15.0% production was increased more than control (for 1 386.0 kg/hm2 of 90 01).The growth stage of the DGA2000 02 was 790 d, and it has deep purple stem and yellow white root. The quality analysis results are as follows: total ash content is 4.2% and acid fast ash content is 0.4%, 16% and 33.3% better than control, respectively; the lixivium is 61.4%, i.e., 4.4% more than the standard of Pharmacopoeia of People’s Republic of China (2005 edition); the ferulic acid content is 0.148%, i.e., 2.96 times ligher than the standard. All these results showed that the quality of the DGA2000 02 was better significantly than both control and the standard. It can be grown appropriately at the high, cold and dankness regions at the altitude of 2 000—2 600 m and with a annual precipitation of 500—600 mm.