2006年上半年我国物流运行情况分析

从社会物流总额,社会物流总费用的构成及其与GDP的比例,物流增加值,物流固定资产投资等4个方面,对2006年上半年我国物流运行总体情况进行了分析。     

超氧自由基(O_2~■)水平在儿童急性肾小球肾炎及其治愈后的变化

以超氧化物歧化酶(SOD)作为分子探针测定了儿童急性肾小球肾炎(AGN)急性期红细胞内超氧阴离子自由基(O_2~?)含量及其治愈后的变化。结果表明,病儿与正常对照者的O_2~?水平有非常显著的差异;急性期与治愈后的差异也非常显著。提示超氧阴离子自由基在AGN发病中有重要作用。     

TMIS中央实时处理系统的容错设计与实现

为保证TMIS系统具有很好的容错能力,从硬件、软件、网络等方面都采取了必要的容错措施。本文涉及的只是中央实时处理软件的容错设计与实现,即在中央实时处理软件的设计和开发中,如何采用软件排错、软件容错技术以提高软件的可靠性。     

GIS理论与技术在"铁路调度管理信息网上发布"系统中的应用与研究

应用ComGIS与WebGIS技术解决实现人工绘制调度图到计算机辅助作图,邮递发送到计算机网络发布的问题。利用组件式方法,成功开发出系统中的"数据加工模块"和"网络发布模块",并将二者有机结合到一个整体的系统框架内,使之具有较好的扩展性;制定出铁路调度图纸信息到矢量GIS数据之间转换的规范并得以功能上的实现;通过研究调度信息中变化与不变信息的分布规律,在系统中采用"模板化"方法对图元信息进行高效管理。并可采用两种B/S结构,通过用户注册和权限控制实现矢量信息安全快捷的网上发布。     

MODEL AND SIMULATION FOR A BRUSHLESS AC GENERATOR WITH AROTARY RECTIFIER

Objective For a brushless AC generator with a rotary rectifier, it is necessary and significant to model and simulate at normal and fault operation states. Methods Two new concepts, namely, Simulink signals and PSB (Power System Blockset) variables, are proposed, and the difference between the two concepts is clarified. Based on the new model for synchronous machines, a simulation model for a brushless AC generator with a rotary rectifier is constructed by Matlab/Simulink/PSB. This new model, which has a speed input terminal and an exciting voltage input one, can simulate the real electrical characters and direct mechanical connection between two synchronous machines perfectly. The rotary rectifier is a three-phase full-wave bridge rectifier which consists of six diodes. The model for the diodes is a macro-model which possesses much better accuracy than an ideal one of switches. Results Based on the present model, some simulation results such as exciting current waveform, phase current waveform and phase voltbge waveform are afftained at several operation conditions. Conclusion The simulation for a brushless AC generator with a rotary rectifier is demonstrated at normal and fault operation states, respectively. The results confirm the presented method.     

CLASSIFICATIONS OF EEG SIGNALS FOR MENTAL TASKS USING ADAPTIVE RBF NETWORK

Objective This paper presents classifications of mental tasks based on EEG signals using an adaptive Radial Basis Function (RBF) network with optimal centers and widths for the Brain-Computer Interface (BCI) schemes. Methods Initial centers and widths of the network are selected by a cluster estimation method based on the distribution of the training set. Using a conjugate gradient descent method, they are optimized during training phase according to a regularized error function considering the influence of their changes to output values. Results The optimizing process improves the performance of RBF network, and its best cognition rate of three task pairs over four subjects achieves 87.0%. Moreover, this network runs fast due to the fewer hidden layer neurons. Conclusion The adaptive RBF network with optimal centers and widths has high recognition rate and runs fast. It may be a promising classifier for on-line BCI scheme.     

2013 Suzuki新车Intruder C1500T发布

Intruder C1500T是铃木2013年的伞新车款，主攻长途巡航。车身内置硬款边箱，但两侧阔度只有990mm，好看又好用。     

陆上利器——力帆KP150摩旅版赏析

自力帆KP150基础版上市以来，好评如潮，在市场掀起不小的波澜，因此，当KP150要推摩旅版的消息一传出，立即引发了众多摩迷的关注，他们无不希望早日一睹KP150摩旅版的风采。     

基于FLEX3530嵌入式控制器的摩托车制动性能测试系统

FLEX3530嵌入式控制器的摩托车制动性能测试系统,主要测量摩托车制动试验时充分发出的减速度、车速、手握力和踏板力等,并采用改进的格拉布斯准则进行数据处理。试验表明,该测试系统具有良好的可靠性和稳定性,便于随车,试验测量精度高。     

基于HCPN的列车运行调度模型分析

结合已有的列车运行调度模型,采用Petri网分析方法对列车运行调度模型在理论上进行了分析和证明,指出模型具有结构有界性、部分守恒性、活性等离散性质以及调度库所的作用,保证了模型的正确性和有效性．通过对模型的分析,得出列车运行调度问题的本质是一个最优控制问题．