摘要：In order to analyze the turn-back capacity of urban rail transit based on CBTC more accurately, firstly, this paper analyzes the turn-back process and characteristics, and the factors that influence the turn-back interval time. Secondly, it respectively analyzes various influence factors and designs algorithm. Then, it designs algorithm and developed computer simulation system (TBSim) for calculating the turn-back capacity based on CBTC and the traction calculation. Finally, it proves the correctness and practicability of the algorithm and the simulation system by an example.

摘要：Most of Iraqi soil is classified as Quaternary deposits, especially in the Mesopotamian plain and tributaries of the River Tigris. Soil varies from north to south of Iraq. These differences in soil affected the process to select the suitable type of foundation. This research is to study the effect of bearing capacity on shallow foundations in different regions of Iraq. Seventy nine samples were collected from 23 boreholes at three different locations (Mosul at the North, Baghdad at the middle and Basrah at the south of Iraq). The samples were collected at varying depth between 1 to 24 m. They were subjected to the following testes: Atterberg limits, sieve and hydrometers, consolidation, direct shear, unconfined compression and the filed (SPT test). The values of the bearing capacity parameters ( and c) were obtained from the above tests. The results obtained were used in the application of the general equation of the bearing capacity. Then, the model of a building was designed (two floors, with mat foundation type) using STAAD Pro software. The average values of bearing capacity in each region were applied in the program (Mosul = 177 KPa, Baghdad = 125 KPa and Basrah = 84 KPa). In addition, the worst bearing capacity values were also used for the three regions (Mosul = 77 KPa, Baghdad = 68 KPa and Basrah = 24 KPa). The results obtained from the average and worst bearing capacity indicated that for Mosul, we could use shallow foundation (spread and mat used if there was basement) for different areas and for buildings with many stories. For Baghdad region, shallow foundation was more suitable for building not higher than five stories. Finally, for Basrah region, shallow foundations were an appropriate selection, but for most areas deep foundation was the right choice.

摘要：在强地震设防区或桥梁承受铁路荷载且地质条件良好时,钢桁架拱桥是理想的大跨度桥梁选择方案。以朝天门大桥和大宁河大桥为背景,从边界条件、初始状态、荷载要素等几个关键影响参数着手,对大跨度钢桁架拱桥的极限承载能力进行参数研究,指出活载的布置形式、侧向风荷载及不同的约束条件对钢桁架拱桥的极限承载力有较大影响。

摘要：Sharing economy developed soon in China *** the basis of analyzing technology spillover between a technologically advanced nation(country)and a less developed one,a technology catching-up model of technological capacity and path dependence is proposed based on Verspagen *** proposed model can explain how a less developed nation(country)can catch up the advanced *** is not only to improve its own technological capacity,but also whether it could bread“the locking”of path *** the less developed nation(country),the“conscious behavior”of economic body cannot be ignored to achieve the evolution from path dependence to path ***,the less developed nation(country)should cultivate the technology ability,furthermore,the creative realization and ability,which could break away the negative impact of technology to path dependence,and catch up the advanced one.

摘要：水功能区管理是水利部门管理水资源的基本单元,水体纳污能力是水功能区管理的核心,掌握水体纳污能力大小并对其变化趋势进行合理预测是极其必要的。出于偏安全的考虑,纳污能力是以水体枯季流量为设计条件确定的。水体纳污能力预测主要从影响水体纳污能力大小的用水、排水两方面考虑,分析各影响因素的变化趋势,从而得出水体纳污能力预测结果。

摘要：针对如何利用高性能多核化设备,提高网络安全产品的处理能力,设计和实现了一种基于x86架构的Llinux平台多核绑定技术。该技术首先建立DMA缓冲队列映射,减少网卡访问次数,采用SIMD多核思想设计和实现了虚拟数据桶,并对进入数据桶的数据实施负载均衡;将Netfilter主函数多线程化,并采用内核线程绑定技术将多线程绑定到指定核.实验结果表明,DMA缓冲队列映射可以提高网络设备的I/O吞吐量,虚拟数据桶减少了数据包二次拷贝的开销,节省内核态内存,多核绑定技术提高网络安全设备多核利用率和数据包处理能力。