The river mouth delta process is affected by river dynamics and coastal dynamics . the process of river delta is estimated by empirical model , analytical model and minimum stream power method . the three models are verified with field data of the yellow river mouth . the computed results are compared with field data . the demerits of the three models are pointed out 采用经验模型、分析模型和最小功率方法研究河口三角洲演变过程.根据黄河河口三角洲资料，利用三个模型计算了河口三角洲岸线或沙咀宽度及岸线的平均延伸情况及对河口近口段河道水位的影响，比较分析了各模型的计算结果，指出了模型不足之处
In chapter 2 , based on the status analysis on the research of milling force , its characteristic is studied for the aero - material of aluminum alloy 7075 - t7351 , and the empirical model is established by using the regression - orthogonal experimental method where the factor number is five and the standard number is four 第二章在总结国内外铣削力研究现状的基础上,采用多因素正交试验研究了航空铝合金7075 - t7351的铣削力学特性,建立了该材料的铣削力经验模型,为研究切削力对加工变形的影响提供了依据。
Abstract : the paper firstly introduces three different approaches for the kinetic modeling of supercritical fluid extraction ( sfe ) ( empirical models , models based on the heat transfer analogy , and models based on differential mass balance ) , and then models kinetic process of the sfe of flavonoid compounds from cedrela sinensis leaves in the presence of ultrasonic , at last shows the defects existed in most of the contemporary kinetic models through the example 文摘:首先介绍了三种动力学模拟超临界流体萃取的模型(经验模型、基于热传递类推的模型以及基于微分质量平衡的模型) ,然后模拟了在超声存在的条件下超临界流体从香椿叶中萃取黄酮类化合物的动力学过程,最后通过该例子展示了现有大多数动力学模型的缺点
And the results show that the calculated settlement agree well with that of measured . the paper established the dynamic pore pressure models of soft soil subgrade and composite foundation , compiled the dynamic fem program of undrained effective stress method , considering the elasto - plasticity of foundation soil as well as the interaction of pavement and foundation , thoroughly analyzed the deformation characteristics of pavement and foundation , and these results are instructive for the construction of pavement or airport runway 本文建立了软土地基和复合地基的动孔压经验模型，编制了不排水有效应力动力反应分析有限元程序，不仅考虑了地基土体的弹塑性，而且考虑了道路结构与地基的相互作用，比较全面地分析了交通荷载作用下道路与地基的整体变形特性，对道路工程或机场道面工程的建设具有一定的指导意义。
The paper points out that different material must be imitated through different methods . in the paper , the standard material is imitated by using illumination model , and the non - standard material is imitated by using texture and illumination model . last , using the realistic image synthesis technique , material function and the rendering technique , i realize the scene modeling , projection transformation , visible - surface detection , illumination model and surface rendering in this paper 其次，根据材质属性的不同将材质分为标准材质和非标准材质，并且根据材质的不同属性而采用不同的方法进行模拟，对标准材质，如铜、铁通过光照明模型技术来模拟；对木材等非标准材质通过纹理映射技术来逼真的模拟，并分析总结出模拟各种材质的经验模型，即一个初步的纹理生成函数，在此基础上对函数进行了数学演变，最终建立一个比较完善的纹理生成函数，并且对函数中的主要影响因素进行了分析。
Firstly the necessity of water erosion modeling on hillslopes is discussed . then existing water erosion models are generally divided into two types , formalization logic computational models and dialectical logic computational models according to the way of solving problems where the former can be further divided into four types - primarily empirically based , partially conceptually and partially empirically based , partially process based and partially empirically based , as well as theoretically based as weak points of the previous classification methods are concerned . finally characteristics of each type and their relationships are illust rated by examples 考虑到原有水蚀模型类型的不足，对当前水蚀模型按解题方法重新归为形式逻辑计算模型及辩证逻辑计算模型两类。其中，形式逻辑计算模型又分为经验模型半概念半经验模型半过程半经验模型以及理论模型4类。结合实例阐述这几类模型的主要特性及相关关系。
The paper firstly introduces three different approaches for the kinetic modeling of supercritical fluid extraction ( sfe ) ( empirical models , models based on the heat transfer analogy , and models based on differential mass balance ) , and then models kinetic process of the sfe of flavonoid compounds from cedrela sinensis leaves in the presence of ultrasonic , at last shows the defects existed in most of the contemporary kinetic models through the example 摘要首先介绍了三种动力学模拟超临界流体萃取的模型（经验模型、基于热传递类推的模型以及基于微分质量平衡的模型） ，然后模拟了在超声存在的条件下超临界流体从香椿叶中萃取黄酮类化合物的动力学过程，最后通过该例子展示了现有大多数动力学模型的缺点。
- the microclimate in greenhouse is characterized by complicated , nonlinear and uncertain environment , and is extremely difficult to set up the precise mathematics model for it , so this paper atilizes inielligent control theory , especially the artificial neural network and genetic algorithm to build the empirical model for the microclimate in greenhouse 由于温室小气候的影响因子复杂、具有非线性和不确定性的特点，难以建立精确的数学模型，因此本文采用智能控制理论，特别是人工神经网络和遗传算法来建立温室小气候的经验模型。
According to the present condition of the packaging cad , the paper analyzes necessity and possibility of developing material module of 3d packaging cad , provides the viable method on theory , sums up experiential model and puts forward concrete method . first , the paper analyzes how to establish the 3d model for material function studying by using computer graphics technology and reasonable date - construction 本文从目前包装cad的现状出发，分析了开发三维包装cad系统材质功能模块的必要性和可行性，为三维包装cad系统材质功能模块的开发从理论上提供了可行的方法和总结出经验模型，并且编程实现了这些模型，进而为开发商用三维包装cad系统软件中的材质功能提供了基础。
