FPGA在CSR主环电源控制系统中的应用

论文介绍了基于DSP和FPGA主环电源控制系统的设计。DSP与DAC之间通过FPGA连接,并通过FPGA来控制DAC的输出。重点介绍FPGA的程序设计及其仿真结果。系统达到了设计要求,已成功应用于CSR主环控制系统。

35MeV/u~(40)Ar+~(197)Au反应中热核的统计发射研究

利用硅半导体＋ＣｓＩ（Ｔ１）闪烁体望远镜测量３５ＭｅＶ／ｕ４０Ａｒ＋１９７Ａｕ中发射的轻带电粒子，用能谱斜率方法和双同位素产额比方法提取了核温度参量．研究了热核发射过程中的统计发射规律．

分光光度法测定蒙古栎叶中多酚的含量

以没食子酸为标准品,使用福林酚试剂(FC),通过分光光度法,对蒙古栎树叶中植物多酚含量进行了测定.首先从方法的稳定性、线性关系、精确性和准确性角度,对FC法进行了调整,确定了以没食子酸为标准的最佳反应条件.结果表明,最佳反应条件为0.15mL FC试剂(1mol/L),0.15mL 10%体积分数的Na2CO3,25℃反应80min后于760nm处测吸光值.使用调整后的方法测得结果为:蒙古栎叶中总酚含量为6.39%,RSD为1.90%.方法操作简单,结果重现性好,可用来测定蒙古栎叶中总酚的含量.

Decomposition of transformer oil under ultrasonic irradiation during degassing process

In the degassing process of transformer oil with ultrasonic waves, decomposition of the oil was observed. Light hydrocarbons, including methane, ethane, ethylene, acetylene, propane etc, were found to be released continuously from the oil into headspace within a closed vial placed in an ultrasonic field. The gases came from decomposition of hydrocarbon Molecules under cavitation effect.

解决中国粮食问题的战略对策选择

从粮食地位、深度开发、科技兴粮、开源节流、人口控制五个方面作了系统的分析 ,提出了综合解决中国粮食问题的基本思路 ,为 2 0 0 0年和 2 0 30年实现 5 .2亿 t和 7.34亿 t的奋斗目标提供科学依据

Investigation of thermal unfolding process of cyanic adduct of horseradish peroxidase by Fourier transform infrared and circular dichroism spectrometry

Detailed circular dichroism(CD) and Fourier transform infrared (FTIR) studies have been carried out to monitor thermal unfolding of horseradish peroxidase isoenzyme C(HRP) inhibited by CN(HRP-CN). The results suggest that HRP-CN is quite different from native HRP with different spin states of Fe of heme and different coordinated states. Cyanide becomes the sixth ligand of Fe(I) of heme and the hydrogen-binding network is destroyed partly at the same time, which cause the drastic decrease of thermal stability of HRP. The FTIR and Soret-CD spectra analysis demonstrate that during the heating process there is an intermediate state(I') which has both partly destroyed secondary and tertiary structures of native HRP, then it is the appearance of protein aggregation state(A) after fully unfolding. The unfolding pathway thus can be shown as follows: I -->I'-->U -->A.

气相中C_(60)与多氯代乙烷的反应

在质谱仪离子源化学电离条件下.C_(60)分别与1,2-二氯乙烷、1,1,2-三氯乙烷、1,1,1-三氯乙烷及1,1,2,2-四氯乙烷的主要碎片离子反应,生成多种C_(60)的加合离子.显示了气相中C_(60)的化学活泼性.

十六烷基三辛基铵静电吸附氯金酸的Langmiur-Blodgett膜及其修饰聚氯乙烯液膜金离子选择性电极的研究

首次尝试用Langmiur-Blodgett(LB)技术修饰PVC液膜离子选择性电极,在PVC液膜表面上制得十六烷基三辛基铵-氯金酸LB膜,明显改善了PVC液膜金离子选择性电极的某些工作性能。电极线性响应范围为1×10~(-2)～1×10~(-7)mol/L,对常见的9种阳离子和4种阴离子的干扰能力明显的增强,响应速度也有所提高。若能改进挂膜方式,可望进一步改善有关性能。