电离层延迟模型改进研究

由于电离层延迟会对卫星的定位精度产生很大的影响,传统的电离层延迟Klobuchar模型的预报精度不高,而且其对夜间电离层延迟以及对延迟峰值出现时刻的预报存在明显的不合理性。因此必须进行修正,根据实测电离层延迟数据的特点对传统的Klobuchar模型进行了改进,并利用非线性最小二乘迭代算法对两种模型进行参数拟合,采用拟合参数计算两种模型的拟合值。通过比较两种拟合值相对于实际测量值的精度,可以得出:改进模型比传统模型提高了电离层延迟预报的精度,并且改善了传统延迟模型预报中存在的不合理性。     

某型地空导弹半实物仿真训练评估系统接口电路设计

在开发某型地空导弹半实物仿真训练模拟系统时,实现系统硬件结构面临的主要难点之一是如何设计、实现其评估子系统的硬件接口电路,它主要用于为评估子系统采集需要的定量数据;评估子系统通过分析采集到的数据,来判断操作动作的准确性;结合某型地空导弹半实物仿真模拟训练系统的开发,以数字I/O卡PCL722为核心器件设计了该子系统的接口电路;运行结果表明,基于PCL722卡的接口电路符合评估子系统的要求,是可行、有效的。     

基于ATML标准的测试信息描述研究

当前测试领域缺乏一个广为接受的测试信息交换标准,这已成为自动测试系统向前发展的一个瓶颈,为了解决此问题,IEEE发布了ATML标准,该标准使用XML语言进行ATS的测试信息的标准化交换;文章首先介绍了ATML标准的目标与具体组成,然后以测试结果为例,实现了基于ATML标准的测试结果信息的标准化描述;为了方便测试软件的开发,本文开发了测试结果组件,测试软件中直接调用测试结果组件以生成符合ATML标准的测试结果文件。     

基于PXI总线舰载光电经纬仪伺服控制系统

为了克服舰船摇摆及风阻力矩干扰所造成舰载光学测量设备跟踪稳定性下降、目标丢失的影响,伺服系统通过接收主控微机提供的船摇信息,将船摇速度校正放大后引入速度回路,实现经纬仪的自稳定跟踪;通过对PXI总线技术进行探讨,分析PXI总线的规范和特点,结合伺服控制器的工作原理和组成,基于PXI总线的FPGA、DSP应用以及外围接口电路设计,大大减小了系统的体积,提高系统集成度、可靠性和稳定性。     

Automatic Reconfiguration of Petri Net Controllers for Reconfigurable Manufacturing Systems With an Improved Net Rewriting System-Based Approach

The advent of reconfigurable manufacturing systems (RMSs) has given rise to a challenging problem, i.e., how to reconfigure rapidly and validly a RMS supervisory controller in response to frequent changes in the manufacturing system configuration driven by fluctuating market. This paper presents an improved net rewriting system (INRS)-based method for automatic reconfiguration of Petri net (PN) supervisory controllers for RMS. We begin with presenting the INRS which overcomes the limitations of the net rewriting system and can dynamically change the structure of a PN without damaging its important behavioral properties. Based on INRS, a method for design reconfigurable PN controllers of RMS is introduced. Subsequently, we presented an INRS-based method for rapidly automatic reconfiguration of this class of PN controllers. In the reconfiguration method, changes in a RMS configuration can be formalized and act on an existing controller to make it reconfigure rapidly into a new one. Noticeably, no matter the design or reconfiguration, the expected behavioral properties of the resultant PN controllers are guaranteed. Thus, efforts for verification of the results can be avoided naturally. We also illustrate the reconfiguration of a PN controller for a reconfigurable manufacturing cell.     

紧凑等离子体环整体加速过程的数值计算

紧凑等离子体环（CT）应用广泛,可以作为聚变驱动源和脉冲X射线源等,对CT加速过程的研究是其应用方面研究的基础．描述了CT加速的基本原理,基于整体加速模型导出数值模拟方程组,采用四阶龙格-库塔法数值求解此方程组．根据Phillips实验室MARADUER的参数和SHIVA—STAR电容器组参数,对CT在同轴加速器内的加速过程进行了数值模拟,定量地分析了影响加速效率的各种因素．计算结果表明：CT的质量越大、加速器越长,加速效率越高,但加速效率存在饱和趋势;电感和电阻越小,加速效率越高;对于一定的电容器初始储能,电容值较小时加速效率越高．     

“图”“画”的较量——“插画”名称变迁的背后

随着经济的发展,我国的商业插画逐渐繁盛,特别是近十几年的时间里得到了较好的发展,相关的理论研究也取得了进展,但是"插图"与"插画"的概念问题一直困扰着中国的设计实践与理论研究。本文从"图"、"画"的词语选择变迁上分析词汇的选择是社会经济状况的变迁、经济状况变迁对人们心理的影响以及国外思想观念的影响的综合体,"插图"进入历史,"插画"得到全新的发展是历史的选择。     

基于CC1100的无线抄表系统

介绍了一种利用单片机和CC1100无线通讯芯片构成的无线抄表系统,叙述了工作原理和实现过程,并重点介绍了CC1100的电磁波唤醒功能和原理,给出了详细的结论.     

Characterisation of flucloxacillin and 5-hydroxymethyl flucloxacillin haptenated HSA in vitro and in vivo

Flucloxacillin is a synthetic penicillin used in the treatment of Staphylococcal infections. Adverse reactions to the drug are believed to arise through covalent modification of proteins, with tissue damage occurring secondary to an immune reaction. Serum proteins have been shown by adduct-specific antibodies to be modified by flucloxacillin, but the nature and sites of modification have not been characterised. Here, in vitro studies on HSA have shown by MS that the modification of protein lysine residues occurs in a dose-, time- and site-dependent manner. Affinity, cation exchange and reversed phase chromatography prior to MS revealed in vivo modification of HSA with flucloxacillin in tolerant patients, with up to nine modified lysine residues being detected in each patient, and with modification of Lys190 and Lys212 being detected in 8/8 patients. It was also revealed for the first time that plasma proteins could be modified with the 5-hydroxymethyl metabolite of flucloxacillin, and that essentially the same Lys residues were targeted by both the parent drug and its metabolite. This study provides a detailed characterisation of sites of chemical modification of an endogenous target and reveals candidate peptides for T-cell and antibody assays of flucloxacillin hypersensitivity.