数据流

The researches on data gaps at home and abroad were summarized. Based on an introduction of catastrophe theory, the development and current research o...

本文总结了数据间隙的研究，介绍了突变理论的基本内容，综述了国内外应用突变理论解决交通流数据间隙问题的研究历史和现状，展望了突变理论应用的前景。

The main works of this paper are as follows.First, according to the three-step method, 1-D unsteady flow model in river network is introduced. A new topological structure is presented to describe and store the topology information and data in river network ,which realises the connection between GIS and the numerical program of hydraulic calculating and turns the program into a universal one .A new formula of internal boundary conditions with double-recursion algorithm is deduced, and the relationship of recursive coefficient between imaginary channel length and non-imaginary channel length is presented ,which makes sure that the model can comprise the numerical simulation of the internal boundaries such as side pipe outflow ,barrage, slice gate and drainage pump station.

主要工作如下：(1)根据三级解法建立了一维河网非恒定流模型，并提出了一种新的数据结构来描述和储存河网拓扑信息，方便了GIS平台和数值计算程序的衔接，实现了三级解法程序的通用性；从河段方程组出发，根据虚设河段法推导出了内边界条件的双追赶法公式，指明了虚设河段的追赶系数和非虚设河段追赶系数的关系，从而使模型可以模拟集中旁侧入流、堰、闸、水泵等内边界对行洪过程的影响。

They said the movement of a huge stream of ice, about 100km wide and 800m thick, creates seismic waves and can be felt through the entire Antarctic.

数据显示，这块冰流宽约100公里，厚约800米。每次移动时，冰流发出的震波波及整个南极洲。

The probability density function of non-following headway and formulations of random variables of two kins of traffic flows are deduced.

本文以爱尔朗分布为基础，将高速公路上车辆分为队状跟车和非跟车两种类型交通流，用大量实地观测数据检验分布的特性，推导出非跟车流车头间隔的概率分布函数和仿真用的两种交通流的随机变量公式。

This thesis calculates effects of the Magnus and Saffman forces on the saltation height and distance of sand grains and vertical concentration distribution of Aeolian sand flow by combinations wind tunnel experiment data and motion model of saltating sand grains.

本文结合风洞实验数据、沙粒跃移运动学模型与风沙流的垂向分布模型，数值计算了Magnus与Saffman效应对跃移沙粒的跃移高度、跃移距离以及风沙流垂向质量浓度分布的影响。

Passenger flow models for walkway, upward stairway and downward stairway which illustrate passenger speed/density relationships have been built using statistical method based on the collected data at different types of passenger facilities in urban railway transit hubs.

然后针对北京市几个主要轨道交通枢纽进行了大量乘客交通流数据的观测和采集，建立枢纽内进站通道、出站通道、换乘通道、上行楼梯和下行楼梯处的速度-密度关系的交通流解析模型，得。。。

When opening of valve is equal to height of valve chamber, conductive and critical pressure ratio are close to maximum value.

对T型管接头的四个流型进行流场计算，计算结果与试验数据基本吻合，表明计算结果是正确的。

Based on the water environment spatial data mining and visualization method, the paper presents these main characteristics and innovations:①Measurement of contamination fluxes:A scene-based research strategy is proposed:measurement /water quality analysis→flow field simulation→contamination transformation rule→fluxes scene simulation→temporal-spatial rule analysis.②Serial numerical models of water environment in the Qiantang River:The controlled equations of the flow field model of the main river,united controlled equations of the main contamination fluxes and water quality prediction model at emergent time are set up.③GIS-based water quality and contamination fluxes decision-making assistance system:A water environment database has been set up;based on MapX and C#.net platform,a system has been developed to facilitate visual inquiry,decision-making and graphics export.

本文基于水环境空间数据挖掘与可视化的研究方法与体系，研究中的主要特色与创新点为：①河流污染物通量测算的技术与方法：提出了基于工况测量/水质分析→流场模拟→污染规律解析→通量情景模拟→时空规律分析的研究方案；②钱塘江水环境模拟系列数学模型：建立了钱塘江干流研究区域流场数学模型的控制方程、主要污染物通量模型的联合控制方程、突发污染事故水质预报模型的基本方程；③基于GIS的水质预报与污染物通量决策支持系统的研发：建立水环境时空数据库，基于MapX和C#。net平台进行系统的构建与开发，为研究的系列成果提供可视化的查询、决策与图形输出。

Lacking of impersonal observation information of triggering area of debris flow, this essay brings forward to cell automaton model to study on it based on sand pile model.

由于泥石流产流区的观测数据的缺乏，本文首次提出基于沙雄模型来建立改进的二维沙堆自动机模型，来研究泥石流产流区系统的自组织临界性。

It is requesting (according to its Request/Transmission Policy, as in 11.4.9.13) and being granted bandwidth for transp ort of data packets.

激活业务流的激活Qos采纳数集不为空，激活之前为空。业务流用来请求和分配数据包传输带宽。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。