净化城市径流的柔性排护岸技术研究

设计了对沿岸坡径流而下的雨水有强化净化作用的柔性排护岸,该结构充分利用了城市岸坡普遍具有一定坡度和落差的特点,将大孔隙混凝土砖的砖间隙作为布水通道,实现了径流雨水在排体内植物和骨料间逐层阻滞后的深度渗滤,强化了对径流雨水的阻滞作用和渗滤强度.配合比优化试验、植物种植试验和工业化生产中试等试验表明,该排体材料可保证植物生长,在强度上可满足护岸要求,并可进行规模化生产.该结构对径流污水有较好净化效果好,整洁美观,运行成本低,维护简单,不占用土地,在我国有很高的推广应用价值.     

床垫产品质量安全影响因子研究

通过分析影响床垫产品质量安全的关键因子,希望能够促进我国床垫产品质量的提高提升床垫产品的竞争力。     

河道崩岸治理方法及典型实例分析

结合长江河道崩岸岸段治理现状．对抛石、四面六边体框架群、混凝土铰链排、柴排等护岸结构形式进行适应性分析,并结合典型窝崩岸段治理实例,对护岸效果进行分析,结果表明,在南京河段水沙条件下,抛石结合四面六边体框架群的护岸形式对窝崩治理的促淤、减速、稳定作用明显。     

粉喷桩复合地基承载力计算中α和β取值问题

通过采用规范公式对粉喷桩单桩和复合地基承载力的计算结果与现场静载荷试验实测的单桩和复合地基承载力结果进行比较，指出规范公式中对α和β的取值规定偏低，同时指出，对复合地基铺设褥垫层比不铺设褥垫层的承载力要高得多。     

Dynamics analysis of TCP Veno with RED

This paper studies the dynamics of TCP Veno with the queue management of RED (Random Early Detection). We develop a fluid-flow model to describe the behaviors of TCP Veno in wired/wireless networks. This model is further linearized to study TCP Veno’s stability issue through the linear feedback control theory. The analysis points out how the RED queue oscillates under different network parameters such as link capacity, round-trip time. Simulations are carried to validate our theoretical analysis. Furthermore, based on the analysis results obtained in this paper, we are able to provide guidelines for tuning RED parameters to stabilize the router queue, and improve the co-existence between TCP Veno and TFRC (TCP-friendly Rate Control) flows.     

机会网络中一种提高TCP性能的跨层改进算法

针对机会网络中TCP与传染路由结合时,传染路由的"洪泛"特性和机会网络的间断特性会使得TCP性能变差的问题,提出了一种基于传染路由协议和TCP/Reno协议的跨层改进算法——ACK-EPI.该算法对连接开始阶段的慢开始门限值进行修改,以避免因网络错误进入拥塞避免阶段而导致拥塞窗口增长速度过于缓慢.同时,为了避免网络中已经成功交付但仍存储在网络中其他节点的数据包的复本继续在网络中存在并扩散,造成网络资源浪费,算法还利用ACK作为到达通告来删除这些冗余数据包.通过深入的仿真分析和比较,结果表明ACK-EPI算法能明显改善TCP性能.     

塑料土工格室的生产与应用技术

介绍土工格室的结构特点、性能、生产工艺流程、主要原材料与配方、超声波塑料焊接、质量标准及应用技术。     

生态型护岸结构冻胀适应性的试验示范研究

通过对3种生态型护岸结构冻胀融沉变形的观测,分析了格宾网垫护坡和铰链式护坡结构冻胀量的发展变化过程及残余变形的分布情况。根据观测结果分析,得出以下结论：格宾网垫护坡和铰链式护坡结构是柔性护坡结构,整体性好,具有自愈的功能,能够很好的适应冻胀变形;冻胀量的变化与现场试验段土体含水率的分布情况关系密切,本次观测最大冻胀量均发生在渠坡1/2处。     

Bedding ignition,vertical flame spread and subsequent thermal impact on underlying mattress

The ignition of bedding and subsequent vertical spread of fire along the side of a noncombustible surrogate bed set was investigated. One‐hundred‐eight (108) tests were conducted to assess the ignition timeline and subsequent vertical flame spread of bedding up the side of a bed along with the thermal impact of the bedding fire on the underlying bed set. The ignition source for all tests was comprised of the flame from a book of matches placed on bedding at floor level at the base of the bed. The bedding consisted of combinations of a cotton/polyester blend sheet and bedspread. Ignition occurred in 3 to 10 seconds for the majority of the test. The speed of subsequent vertical flame spread, assessed through video frame analysis tools, was dependent on the exposed bedding material with an exposed sheet exhibiting faster spread. Thermal exposure from the burning bedding to the vertical sides of the bed set was assessed with an array of thermocouples embedded at the surface of the sides of the underlying bed set. The time to thermal exposure was found to be a function of the vertical flame spread and thickness of the bedding material(s).     

基于opnet的TCP Veno性能研究和仿真

由于传输介质不同,传统拥塞控制算法在无线网络中出现了性能退化。为此,提出了包括TCP Veno在内的多种改进算法。TCP Veno通过检测链路中积压数据包大小来判断丢包的性质,进而对TCP Reno后三个阶段进行改进。利用OPNET Modeler对该算法下的吞吐量、网络利用率、公平性、友好性进行仿真分析。结果表明,TCP Veno各方面性能均比Reno得到提高。