杭州四堡特大型全地下式污水泵站设计

随着城市建设对景观环境要求的不断提高,城市泵站工程如何在确保良好的运行效果的前提下,合理利用地下空间、减少对周边环境的影响,与景观有机结合,已经越来越成为决定工程设计整体品质的关键。以杭州四堡污水转输泵站为实例,介绍了特大型全地下式污水泵站相关工程设计,以期对类似工程设计提供参考。     

三正辛硫基三嗪的摩擦性能研究

利用四球摩擦磨损试验机考察了三正辛硫基均三嗪（TOTT）在菜籽油中的摩擦学性能．实验结果表明,类化合物具有良好的极压性能,能很大地提高菜籽油的极压性能．利用X射线光电子能谱（XPS）和扫描电子显微镜（SEM）分析了钢球磨损表面典型元素的化学状态,并探讨了该类添加剂的摩擦学机理．利用液质联用考察了该化合物在十六烷中摩擦前后的变化,结果表明,在摩擦过程中,TOTT分子发生了分解,主要是与C原子连接的合S支链从三嗪环上脱落,再与钢球表面发生摩擦化学反应,在钢球表面形成了一层合硫,磷的富氧膜和有机氮复合膜,这种复合膜是添加刑具有优异摩擦学性能的主要原因．     

地铁通信传输系统方案探讨

根据当前通信技术的发展状况,对城市轨道交通建设中的通信传输系统方案进行探讨．包括开放式传输网络(OTN)、光同步数字传输网(SDH)及异步传输模式(ATM)三种方案,并对各方案的特点进行分析。     

连续刚构桥0号块水化热温度场分析

以水口大桥为例,根据实测外界环境温度、浇筑初始温度等条件,按照瞬态热传导方程,运用有限元分析软件ANSYS对该桥0号块水化热温度场进行分析,并将仿真结果与实测数据比较,两者吻合较好。结果表明:混凝土浇筑时的初始温度与瞬态温度场呈线性关系,水化热系数同时影响温度峰值及其出现时间,外界大气温度对后期温度场影响较大。     

四室井筒式地下连续墙水平承载试验研究(英文)

井筒式地下连续墙基础因为存在土芯、墙体和外部土体的相互作用,其水平承载机理复杂。进行了3组不同尺寸的四室模型墙试验。基于模型墙内力和位移测试结果,研究了其水平承载特性。结果表明:不同截面尺寸和埋深的井筒式墙基础在不同水平荷载下的弯矩、剪力、转角、土抗力以及摩阻力分布形状相似;随着墙体截面尺寸和深度的增加,弯矩增大,墙体呈现刚体破坏特征;前墙外侧土抗力随荷载线性增加,成为土抗力的主要贡献部分。     

海船轴频电场建模方法研究

轴频电场是由于螺旋桨转动时因主轴和轴承之间的接触阻抗不恒定而导致流经主轴的腐蚀或防腐电流受到周期性调制而产生,是海船的一个重要目标特征信号.文中利用时谐电流元,从理论上推导了海船轴频电场的数学建模方法,采用该方法只需有限的测量数据即可建立海船轴频电场的数学模型,拟合海船产生的轴频电场分布.     

CO2 emissions from typical cement plants in China

The objective is to know how the CO₂ emits and how much the CO₂ emits due to the cement manufacture in both direct and indirect ways with the increasing concerns about the global warming and the cement plants emitting huge CO₂. A precise method to calculate CO₂ emissions including three processes was established in this paper and a case study was provided. From the case of 23 typical plants in China, we can see the amount of CO₂ emissions at the right level. The summary of CO₂ emissions consists of emissions from raw materials, fuels and electricity. The average result of the 23 typical plants is 0.74 t CO₂ per ton clinker in this study. Therefore, CO₂ emissions from these typical cement plants were pictured and then measured. The creative point is that an approach provides a basic framework to identify various situations in different cement plants in China and other in the rest of the world. The framework would be useful in quantitatively evaluating CO₂ emissions for government to know precisely CO₂ emissions in the cement plants.     

Self-organizing map based quality assessment for resistance spot welding with featured electrode displacement signals

To classify the quality of the resistance spot welding process, a relationship between the welder electrode displacement curve characteristics and the weld shear force has been explored. Eleven statistical features of the displacement signals are extracted to represent the welding quality. Self-organizing map (SOM) neural networks have been employed to discover their quantitative relationship. In order to identify the influence of various displacement curve features, all of the available combinations have been used as inputs for SOM neural networks. Further we analyze the impact of each feature on the classification results, yielding the best quality-indicative combination of characteristics. There is no determinant relationship between the welding quality and the level of expulsion rate. The quality of welding is most impacted by the maximum electrode displacement, the span of welding process and the centroid of the electrode displacement curve. The experiments show that SOM is feasible to assess the welding quality and can render the visualized intuitive evaluation results.     

基于GIS-T中间件的公路管理多源数据共享平台

目前已经建成的公路管理数据库,要么没有结合GIS技术,要么仅仅针对某一方面的具体应用,很难实现业务系统之间的协同运行与数据交换．文中提出基于GIS-T中间件技术建立公路管理分层、分布式多源数据共享平台,通过中间件接口、XML参数传递与数据共享来实现公路管理中多个业务系统之间的协同处理与空间可视化操作,研究了其中的关键问题并提出了解决办法．     

Fast affine projection algorithm for adaptive noise canceling and its application on the fetal electrocardiogram extraction

Aimed at the problem of adaptive noise canceling (ANC), three implementary algorithms, which are least mean square (LMS) algorithm, recursive least square (RLS) algorithm and fast affine projection (FAP) algorithm, have been researched. The simulations were made for the performance of these algorithms. The extraction of fetal electrocardiogram (FECG) is applied to compare the application effect of the above algorithms. The proposed FAP algorithm has obvious advantages in computational complexity, convergence speed and steadystate error.