一种基于第二代开关电流技术的模式识别模糊处理器

本文提出了一种新的基于第二代开关电流技术的模式识别模型处理器。     

数字式调频收音机设计

介绍利用数字锁相频率合成技术构成收音机的电调谐部分并阐述了收音机的调台、选台、搜索与存储等功能的电路设计原理，着重介绍了用收音机集成芯片CXA1019S构成的FM电路、频率合成器芯片BU2614构成的锁相环电路。     

单片机在三线摆实验中的应用

介绍了用8032单片机辅助三线摆实验的原理和方法，并分析了实验结果。     

石油测井仪器远程升级方法研究

由于石油测井仪器拆卸困难,采用传统的JTAG仿真器对仪器进行升级和维护将给现场作业带来不少的麻烦。针对这一缺点,本文提出了一种在不改变原有电路结构的情况下,利用现有的测井总线对石油测井仪器进行远程实时升级的方法。本方法将烧写文件通过现有的测井总线传输至井下主控电路板,主控电路板上的FPGA首先对串行数据进行曼彻斯特解码,然后借助DSP处理器内部的烧写软件完成对DSP处理器的片上FLASH的程序烧写功能,从而达到远程升级的目的。本方法提高了石油测井仪器的灵活性和扩展性,同时由于借助现有的远程通信机制,升级过程稳定可靠,大大提高了仪器的现场维护能力。     

在PC机上处理C－R6A机的色谱图和数据

Programs involving C and C-R6A BASIC languages are compiled to get and handle the chromatogramsand data from C-R6A chromatographic data processor. The chromatogram and data can be changed to ASCIIfile or random file and can be processed by any advanced languages.     

A comparative study of extraction apparatus in HPLC analysis of ochratoxin A in muscle

Ochratoxin A (OTA) is a secondary fungal metabolite produced by several moulds, mainly by Aspergillus ochraceus and by Penicillium verrucosum, that occurs in meat products. The aim of this work was to optimize an efficient extraction procedure for the determination of OTA in muscle tissue in order to assess its occurrence in meat samples. Three different apparatus, a Waring blender, a switching apparatus, and an ultrasonic processor, were evaluated to verify the efficiency of extraction. The analytical methods proposed involve the extraction with chloroform-orthophosphoric acid, cleanup through an immunoaffinity column, high-performance liquid chromatography/fluorescence detection for separation and identification of OTA, and confirmation with liquid chromatography/FD after methylation of OTA in muscle tissue. The limit of quantification of the proposed method was 0.04 μg kg⁻¹. Recoveries of OTA, using switching apparatus, ranged from 90.3 to 103.2% for chicken muscle spiked at 2.4 and 0.48 μg kg⁻¹, respectively, with a within-day relative standard deviation of 17 and 15.3%. The proposed method was applied to 38 chicken, swine, and turkey muscle samples and the presence of OTA was confirmed in five samples. Finally, the estimated daily intake of OTA in this study was between 23 pg kg⁻¹ body weight per day for swine samples and 18 pg kg⁻¹ body weight per day for turkey samples.     

New method for parallel computation of Hessian matrix of conformational energy function in internal coordinates

A new algorithm for parallel calculation of the second derivatives (Hessian) of the conformational energy function of biomolecules in internal coordinates is proposed. The basic scheme of this algorithm is the division of the entire calculation of the Hessian matrix (called "task") into subtasks and the optimization of the assignment of processors to each subtask by considering both the load balancing and reduction of the communication cost. A genetic algorithm is used for this optimization considering the dependencies between subtasks. We applied this method to a glutaminyl transfer RNA (Gln-tRNA) molecule for which the scalability of our previously developed parallel algorithm was significantly decreased when the large number of processors was used. The speedup for the calculation was 32.6 times with 60 processors, which is considerably better than the speedup for our previously reported parallel algorithm. The elapsed time for the calculation of subtasks, data sending, and data receiving was analyzed, and the effect of the optimization using the genetic algorithm is discussed.     

Development of a parallel molecular dynamics code on SIMD computers: Algorithm for use of pair list criterion

In recent years several implementations of molecular dynamics (MD) codes have been reported on multiple instruction multiple data (MIMD) machines. However, very few implementations of MD codes on single instruction multiple data (SIMD) machines have been reported. The difficulty in using pair lists of nonbonded interactions is the major problem with MD codes for SIMD machines, such that, generally, the full connectivity computation has been used. We present an algorithm, the global cut-off algorithm (GCA), which permits the use of pair lists on SIMD machines. GCA is based on a probabilistic approach and requires the cut-off condition to be simultaneously verified on all nodes of the machine. The MD code used was taken from the GROMOS package; only the routines involved in the pair lists and in the computation of nonbonded interactions were rewritten for a parallel architecture. The remaining calculations were performed on the host computer. The algorithm has been tested on Quadrics computers for configurations of 32, 128, and 512 processors and for systems of 4000, 8000, 15,000, and 30,000 particles. Quadrics was developed by Istituto Nazionale di Fisica Nucleare (INFN) and marketed by Alenia Spazio. © 1998 John Wiley & Sons, Inc. J Comput Chem 19: 685–694, 1998     

单片机在火车站自动播音系统中的应用

介绍一种在火车站自动播音系统中用单片机构成的下位机系统。该系统可接收上位机指令工作，也可用自带键盘工作，还可手动以进行应急广播，从而保证了整个系统的可靠性，该系统已用于济南新客站。     

导引头多源信息AGC系统设计

针对雷达导引头AGC控制处理中传统低通滤波法在输入信号饱和时无法正常工作以及不能直接反映信号幅度的缺陷,通过分析信号幅度与饱和度及功率检波的相互关系,分别提出了基于饱和度的幅度估计方法和平方和功率检波的幅度估计方法,利用这两种方法的特点结合弹载处理机应用,设计了导引头多源信息自动增益控制算法,并给出了实现流程.利用Matlab仿真引入算例,证明其具有响应时间短、控制精度高、系统性能稳定的特点.