地质超前预报在桃花铺一号隧道TBM施工中的应用

介绍了 R2 4浅层地震仪超前地质预报的技术特点和基本测量机理、步骤 ,结合西南线桃花铺一号隧道预报的实例 ,将超前地质预报结果与隧道开挖实际进行对比 ,显示超前地质预报在 TBM施工中的重要性和实用性。     

RS-485/422标准的UART在DSP系统中的实现

TI公司的TMS320VC5416型DSP投有片上的通用异步串口（UART），若要在TMS320VC5416为CPU的系统中使用UART，必须另行设计。在分析TMS320VC5416的多通道同步缓冲串口（McBSP）与通用串口芯片MAX3140接口原理的基础上，提出了一种简单可行的高速通用异步串口（UART）设计方案，给出了其详细的软硬件设计资料，实践证明具有较高的工程应用价值。     

谈基于CDMA1X的海事虚拟拨号专网(VPDN)的实现

现代信息技术正在以前所未有的速度蓬勃发展，它正在从根本上改变人们的传统理念和思维方式。现代信息技术的发展给海事事业在管理方面带来了机遇和挑战，如何利用好信息化技术实现海事工作的跨越式发展，是每个海事员工应积极思考的问题。交通部海事局提出：“对辖区海事各项业务进行数字化综合管理”，实现海事业务管理向信息化、数字化和现代化的转变。因此，利用计算机网络技术、无线通讯技术、流媒体技术实现数字移动办公在海事工作中是极其重要的。通过联通无限CDMA1X高速无线上网与海事内部专用网络建立虚拟拨号专网（VPDN）连接是实现数字移动办公的一个比较理想的选择。     

A Method of Clustering Components into Modules Based on Products＇ Functional and Structural Analysis

Modularity is the key to improving the cost-variety trade-off in product development. To achieve the functional independency and structural independency of modules, a method of clustering components to identify modules based on functional and structural analysis was presented. Two stages were included in the method. In the first stage the products＇ function was analyzed to determine the primary level of modules. Then the objective function for modules identifying was formulated to achieve functional independency of modules. Finally the genetic algorithm was used to solve the combinatorial optimization problem in modules identifying to form the primary modules of products. In the second stage the cohesion degree of modules and the coupling degree between modules were analyzed. Based on this structural analysis the modular scheme was refined according to the thinking of struc- tural independency. A case study on the gear reducer was conducted to illustrate the validity of the presented method.     

装车地直达列车开行方案优化模型

铁路货物运输在国民经济增长和发展过程中起着越来越重要的作用，而装车地直达运输是一种现代和高效的车流组织形式。它不但能够加快货物送达、加速车辆周转，而且可以减轻编组站作业负担、降低运输成本。本文对装车地直达列车开行方案问题进行了研究。在分析组织装车地直达列车的可能性、合理性及费用参数选择的基础上，构建了装车地直达列车开行方案非线性0-1规划模型。模型中充分考虑了车流在装车地的各种组合方案，并将运输与库存成本纳入同一目标函数，以物流系统成本最优来确定货物列车开行方案。构建的模型能够更全面地描述装车地车流的各种组合，最后给出的构模实例对模型的有效性、合理性进行了验证。     

Construction of GM(2,1)Model for Oscillating Pitch Angle Series

GM(1, 1) is generally used in Grey System Theory which constructs an Ordinary Differential Equation for given se-ries. It is effective for monotone series, and its simulating effect is good and error is small. However, If the series dosen' t havea property of monotone, the simulating effect of GM(1,1) is not fine, and its error gets bigger. In this paper, we use GM(2,1) to handle the oxcillation series, which uses the Method of Minimum Squares in determining the uncertain parameters.The     

基于FPGA的MVB1类设备网卡的设计

考虑到MVB1类设备网卡支持简单的过程数据传送(功能代码为0～4)和设备状态响应(功能代码15)，不支持消息数据、过程数据强制功能的情况，提出利用FPGA(现场可编程门阵列)开发MVB1类设备网卡。这样，在完成通信功能的同时，可以无需外加CPU即完成一些简单的IO、AD等功能，也可以设计出总线方式与CPU相连。实践证明MVB1类设备网卡采用PC104接口与宿主CPU连接，具有110个256位的过程数据通信能力；用FPGA开发MVB1类设备网卡比用MVBC芯片更具优势。     

大型结构温度场实时监测系统

结构健康监测在土木工程学科中具有重要的理论意义和工程价值。其中,温度监测是大型结构健康监测与评估的一个重要方面。以芜湖长江大桥健康监测中的铁路桥连续梁部分分布式温度监测为背景,开发了基于数字式温度传感器DS18B20的大型结构温度场实时监测系统。该系统已经成功地应用在芜湖长江大桥和郑州黄河大桥健康监测系统中,实现了对桥梁结构温度场的实时监测。应用情况表明:该系统具有实时性强、可靠性和准确性高、性价比高、通用性好等特点,对其他大型结构的温度场监测具有重要的参考价值。本文介绍DS18B20的特点、工作流程和系统的软硬件实现技术,并对系统的现场应用情况进行总结。     

Offshore export versus in situ fractionated mineralization: a 1-D model of the fate of the primary production of the Rías Baixas (Galicia, NW Spain)

A linked hydrodynamic mineralization model is described and used to evaluate offshelf fluxes and fractionated mineralization of particulate phytogenic materials in the coastal upwelling system of the Rías Baixas (NW Spain), under three different typical situations of the upwelling season. The simulations made indicate that the intensity of upwelling controls: (a) net community production (NCP); (b) particulate organic matter (POM) accumulation; (c) in situ mineralization; and (d) matter export in the ‘Rías Baixas.’ Under strong upwelling conditions, there is an important horizontal offshelf flux, having only a small mineralization effect on NCP; if weak upwelling conditions are simulated, POM export is dramatically reduced and in situ mineralization is significantly enhanced; finally, under average upwelling conditions, the offshelf export of POM is about one third of the POM accumulation inside the domain, evidencing its importance in the productivity enhancement of near-shore areas. According to our sensitivity tests, the net vertical velocity (water velocity plus sinking velocity) has a critical role in the C/N/P stoichiometry of POM.     

铁路信号站间信息的安全传输方案研究

安全是铁路运输的永恒主题。在信息化的浪潮中，计算机控制系统在铁路中得到了广泛的应用。本文研究的结合多种站间通信方式的通过安全散列算法-SHA-1来保证站间信息的安全传输方案，为进一步提高计算机控制系统功能，完善站间信息的传输方式及传输容量，适应今后的发展奠定了基础。