吊放声呐信号处理机测试设备系统设计

设计了一套实用的吊放声呐信号处理机测试设备。针对吊放声呐信号处理机实际中调试、检测、维修的需求。利用高性能数字信号处理芯片作为控制中心，结合一些必要的外设，充分考虑实际使用的特点，设计了一套稳定性高，集成度高的测试设备。从系统结构、硬件结构、存储数据结构、软件结构等几个方面入手，阐述了设计思路和实现方法。     

单片计算机兼作密码机

对于通信、计算机和银行等行业说来、主要的问题是敏感的数据会遭受非法操纵和全部盗窃。随着数据业务的迅速增长,这种情况已愈来愈严重。由于国家标准局的努力,现在已有了一个用以保护关键性的(但不是机密的)信息的联邦数据加密标准(DES)。这个文件规定了具体的保密方法并定义了标准的数据加密算法。根据法令,DES只适用于不涉及国家安全的政府机关。已经有迹象表明,DES也将广泛用于商业部门。对于诸如资金兑换和债卷与商品交易之类事业,联邦政府可能要求某些非官方数据通信用户保护他们的信息传输。然而,银行界正在采用DES而不用官方敦促。     

关于拟赋值环的一个刻画

Let R be a commutative ring without nil-factor. In this paper, we discuss the problem of quasi-valuation ring presented in the reference “Wang Shianghaw, On quasi-valuation ring, Northeast People‘s Univ. Natur. Sci. J., (1)(1957), 27-40”,when the quotient field of R is an algebraic number field or an algebraic function field, and we obtain a characterization of quasi-valuation rings.     

Microlaser with Ramsey Separated Fields Cavity

In a novel microlaser configuration with Ramsey separated-field cavity, we investigate a two-level atomic beam interacting with a single-mode high-Q Ramsey cavity, which is composed by two separated resonators. By using the well-known Ramsey cavity, one can recover the characters of microlaser even with a high flux atomic beam.     

Evaluation of Influence of Multiple Scattering Effect in Light-Scattering-Based Applications

The extinction cross sections of a system containing two particles are calculated by the T-matrix method, and the results are compared with those of two single particles with single-scattering approximation. The necessity of the correction of the refractive indices of water and polystyrene for different incident wavelengths is particularly addressed in the calculation. By this means, the volume fractions allowed for certain accuracy requirements of single-scattering approximation in the light scattering experiment can be evaluated. The volume fractions calculated with corrected refractive indices are compared with those obtained with fixed refractive indices which have been rather commonly used, showing that fixed refractive indices may cause significant error in evaluating multiple scattering effect. The results also give a simple criterion for selecting the incident wavelength and particle size to avoid the ＇blind zone＇ in the turbidity measurement, where the turbidity change is insensitive to aggregation of two particles.     

尿中L-精氨酸及其甲基化产物的高效液相色谱法测定

用反相高效液相色谱邻苯二甲醛（OPA）柱前衍生荧光检测，可以直接同时分离和定量尿中的L－精氨酸（L－Arg),N^G,N^G－二甲基精氨酸（ADMA）和N^G,N^G-二甲基精氨酸（SDMA）。方法的平均回收率大于97％；含量的上对标准差低于4．6％；而保留时间的相对标准差低于0．32％；信噪比为3：1时，其检测限为0．3pmol.用该方法测定了正常人和肾肾衰者尿中L－Arg,ADMA和SDMA的含量。     

光纤偏振模色散测量方法的比较

本文介绍了几种偏振模色散的测量方法，其中包括我们改进的Ｓ－３８色散仪法。文中对这些方法各自的优缺点作了比较，其中重点介绍了波长扫描法的原因以及我们在国内进行的ＰＭＤ值测量实验及其测量结果。