基于截取交织的GPS污染谱干扰技术

提出了一种新式拦阻式干扰——"污染谱"干扰,用于干扰GPS接收机。分别提出了基于截取交织技术的等间隔等脉宽与非等间隔非等脉宽"污染谱"干扰产生方式,对其频域特性与干扰效果作了理论分析与仿真实验。仿真结果表明,适当选取"污染谱"干扰的分段数与脉宽,尤其是非等间隔非等脉宽情形下,可以达到优于扫频干扰与离散梳状谱干扰的干扰效果。     

6.3kbit/s CELP语音编码的研究

提出了一种新的6.3kbit/sCELP语音编码方案,其语音质量接近ITU-TG.729的合成语音质量,而编解码复杂度约为10MIPS.它在CELP的3个主要方面作了改进LSP参数的矢量量化;开环基音预测,长时预测滤波器系数的求解和量化一体化;代数码本激励.这些措施在保证合成语音质量的前提下大大降低了计算量,从而能够在单片TMS320C30系统上实时实现.     

Reception and discovery: the nature of Johann Wilhelm Ritter’s invisible rays

Ultraviolet radiation is generally considered to have been discovered by Johann Wilhelm Ritter in 1801. In this article, we study the reception of Ritter’s experiment during the first decade after the event—Ritter’s remaining lifetime. Drawing on the attributional model of discovery, we are interested in whether the German physicists and chemists granted Ritter’s observation the status of a discovery and, if so, of what. Two things are remarkable concerning the early reception, and both have to do more with neglect than with (positive) reception. Firstly, Ritter’s observation was sometimes accepted as a fact but, with the exception of C. J. B. Karsten’s theory of invisible light, it played almost no role in the lively debate about the nature of heat and light. We argue that it was the prevalent discourse based on the metaphysics of Stoffe that prevented a broader reception of Ritter’s invisible rays, not the fact that Ritter himself made his findings a part of his Naturphilosophie. Secondly, with the exception of C. E. Wünsch’s experiments on the visual spectrum, there was no experimental examination of the experiment. We argue that theorizing about ontological systems was more common than experimenting, because, given its social and institutional situation, this was the appropriate way of contributing to physics. Consequently, it was less clear in 1810 than in 1801 what, if anything, had been discovered by Ritter.     

钢板激光光声信号低频特性分析

利用YAG固体激光器产生的脉冲激光照射到钢板表面，采用加速度计拾取激光产生的脉冲光声信号，对脉冲光声信号进行了功率谱分析，得出小于25kHz的低频激光光声信号是一个含有多种频率的复频信号，其功率谱峰所对应的频率大小与样品无关。     

有行星系统恒星的金属丰度研究

计算了7颗类太阳恒星（带有类似太阳的行星系统）的大气参数和多种金属无互的丰度，所有样本星的金属丰度平均值为0.101，其中HD98230的值为－0.271，相对其余6颗星的值小很多（其余6颗星的平均值为0.184），比银盘附近类太阳星的平均值（[Fe/H]≈-0.3）相对较高，计算结果表明行星系统的形成与恒星的富金属丰度存在着一定的联系。     

算子最小模的一个连续点及其应用

研究了复希氏空间上有界线性算子的最模的连续性及其应用，推广了文献的某些结果。     

荧光素二聚体荧光探针同步荧光法测定阿米卡星

基于阿米卡星（AMK）能增强荧光素二聚体的荧光信号，建立了以荧光素二聚体荧光探针同步荧光光谱技术测定AMK的新方法．结果表明，在△λ=30nm，最优条件下，测定AMK的线性范围为0．5～20．0μg／mL，检出限（LOD）为0．51μg／ml．用于实际样品分析，测定回收率为96．9％-104．5％，相对标准偏差（RSD）为3．7％～5．3％．     

基于路面激励的汽车振动信号处理

汽车已成为大众生活的必需品.要提高车辆的平顺性,关键就要使其振动的频谱不在人体的敏感区域.以Matlab软件为计算平台,对从实车上采集的数字信号进行处理,得到其振动频谱.通过频谱分析,可以确定其参数是否合适.这对如何处理振动信号及提高汽车的平顺性有现实的意义.     

紫外分光光度法测定饮料、巧克力和茶叶中咖啡因含量的研究

采用紫外分光光度法对巧克力 ,饮料 ,绿茶等 7种样品中咖啡因的含量进行了测定 ,其平均回收率和相对标准偏差分别为 99.2 8%～ 10 0 .6 % ,0 14%～ 1 0 3% ,结果较为满意 .     

分数Fourier变换与分数微分谱理论

用比较法研究分数Fourier变换。在给出分数Fourier变换的特性后，建立一类分数微分新结构谱。