A 2 - d model for debris flow is tested by experimental data of debris flow deposition . the plane extent , maximum length and width of the alluvial fan are computed under different conditions of supply process , initial ground slope and flow density 为了验证二维粘性泥石流运动数学模型的正确性，以泥石流小型堆积模型试验为模拟对象，计算模拟在不同来流方式、堆积区坡度和泥石流容重情况下的泥石流堆积范围。
Atherosclerotic lesions long have been known to occur near vascular branching points . study have identified in these predisposed areas , hemodynamic shear stress , the frictional force acting on the endothulial cell surface as a result of blood flow , is weaker than in protected regions 从对动脉粥样硬化的临床及病理研究中，我们已确定动脉粥样硬化好发于血管的分支及弯曲处，该处血流方式不同于血管的其他部位。
Ions ( mainly refering to ca2 ' , mg2 * and ncv et al . , which have higher concentration in soil solution ) in rape rhizosphere with no re and appropriate dose re treatments moved mainly via a diffusion process up to a 3mm distance from the central compartment ( c . c ) , and mainly by mass 油菜对照和低浓度稀土处理距根表3mm以内离子（主要指ca 》 、 no 。 w等在土壤溶液中浓度较大的离子）迁移以扩散方式为主， 3mm以外的区域则以质流方式为主。
After expounding the power supply and current collection modes of the rolling stock in shanghai umt pearl line in terms of technology and economy , the author argues that two current collection modes shall be adopted for shanghai umt pearl line , i . e . a third rail collector be on skybridge while the overhead contact line on the ground 摘要阐述了城市轨道交通车辆供电受流方式的特点，并从技术和经济两方面对上海明珠线车辆供电受流方式进行了探讨，提出了明珠线车辆应采用双受流方式，即高架桥上采用接触轨受流器受电，地面采用架空接触网受电弓受电。
The construction scheme is briefly introduced herein , and furthermore , the diversion structures , the composite scheme consisting of open caisson group adopted to treat the overburden of the foundation for the stage 2 longitudinal concrete cofferdam and the diversion method of bottom outlet combined with the dam gap used for the stage 2 diversion are described as well 文中对该方案进行了简要介绍，并介绍了有关导流建筑物，以及二期纵向混凝土围堰堰基覆盖层采用了沉井群等综合处理方案和二期导流采用的底孔加缺口联合泄流方式。
Compared with traditional dynamic work flow , it has satisfied the need of user visual self - defined and dynamic synergetic work . it also fulfilled synergetic message drive based on xml and on - line information communion in the synergetic office platform between users . compared with traditional mail system , it has improved real time of information communion , satisfied the need of information immediate synergetic work 该系统实现了基于xml协同动态工作流驱动和可视化的工作流建模工具( x - workflow ) ,与传统的静态工作流方式相比较,它满足了用户可视化流程自定义需求,满足了人们动态协同工作的需要;它还实现了基于xml的协同消息服务驱动,实现了用户间在协同办公平台内的在线信息交流,与传统的邮箱交流相比较,信息交流实时性得到了大大的提高,满足人们对信息即时协同的工作需要。
When soil antecedent condition is dry and the initial rainfall intensity is high , peak surface runoff also considerably lag behind that of rainfall , because of the formation of temporary relative impermeable top layer ; b ) surface runoff is controlled primarily by infiltration - excess runoff mechanism under unsaturated condition ; the major fraction of surface runoff are dominated by saturated infiltration - excess runoff response , only a small fraction by return flow mechanism when soil is saturated ; c ) subsurface flow is dominated by saturated runoff mechanism , and the duration of subsurface post the rainfall end is dependent upon rather the soil properties than the rainfall characteristics ; d ) subsurface flow intensity in cultivated soil layer ( 0 ~ 20cm ) is high up to 35mm / h when rainfall intensity is up to 120mm / h , indicating the existing of macropores and pipe flow in cultivated layer 2 )耕作制下紫色土的产流主要机制是： 1 )当雨前土壤含水量未达到饱和状态时，表面产流起始时间有明显滞后现象，这与紫色土的快吸水性和较多非毛管孔隙密切相关；当雨前土壤较干燥，降雨初期雨强较大时，易形成临时相对不透水表层，表面产流峰也有明显滞后现象。 2 )表面径流的产流方式主要是超渗产流，当土壤达到饱和状态后，有四川大学博士学位论文小部分回归流发生，但主要是饱和超渗产流发生，因为紫色土的相对不透水层和其它透水障碍层不明显。 3 ）壤中流主要是饱和产流，与降雨过程有明显的滞后，而且雨停后的壤中流产流历时与降雨特征无关。
The paper discusses the methods of multi - objective ecological operation of reservoirs , which covers the establishment of legislation systems ; water demands for the basic ecological functions of downstream river channel ; reservoir discharge patterns simulating natural hydrological regimes ; regulation and control of sedimentation and eutrophication of reservoirs ; mitigation of the influences by water temperature stratification ; the operation techniques in pollution prevention and connectivity reinforcement of water systems 文中讨论了水库多目标生态调度的方法，包括建立相应法规体系；保证维持下游河道基本生态功能的需水量；模拟自然水文情势的水库泄流方式；进行水库泥沙调控及水库富营养化控制；减轻水体温度分层影响；进行防污调度以及增强水系连通性等方面的调度技术。
Numerical simulation were conducted to calculate large model lamilloy with two types of internal flow patterns , three pin shapes and internal channel heights . the complex flow fields and flow resistances were obtained and the effects of internal flow pattern , pin shape and height on lamilloy flow resistance were investigated . the calculated results are in good agreement with the experimental data 在数值模拟部分，运用商用软件fluent6 . 0对两种典型绕流方式、三种绕流柱形和三种通道高度的放大尺寸层板模型进行了数值模拟，获得了层板内部复杂的流场和流阻特性，分析了绕流方式、绕流柱形和通道高度对层板流阻特性的影响，计算结果和实验结果符合很好。
First , this paper analyzes the principle of the boost type pwm reversible rectifier in detail , explores space vector method to investigate its inversion , and establishes the mathematics model in abc coordinate , coordinate , and d q coordinate respectively . secondly , this paper analyzes the control of hysteretic current method , explores the defect of hysteretic current control 本文首先对boost电压型pwm整流器的工作原理进行比较详细的分析，提出了用空间电压矢量方法分析三相单位功率因数电压型pwm整流器的换流方式，建立了整流器在abc坐标系以及在坐标系、 dq坐标系的数学模型。
