数学模型

Based on observation data, the development process of the breach of landslide dams due to over topping may divided into 3 modes: vertical erosion, breadthwise extension and regression erosion of dam slope. A mathematical model describing the gradual failure process of the landslide dams is established based on the formula expressing the high intensity erosion obtained from experimental data, which can integrate the 3 modes of breach development process together. The validity of the model is verified by observation data.

根据一般滑坡堰塞坝特点和实际观测到的堰塞坝溃口发展规律建立了一个溃口扩展模式，并将溃口扩展过程归纳为溃口垂直下切、横向扩展和坝坡溯源冲刷3种主要表现形式，采用通过试验资料建立的高强度泥沙冲刷计算公式将这3种表现方式联系在一起，建立了堰塞坝逐渐溃决数学模型，并利用实测溃坝资料验证了模型的可靠性。

In this thesis, by the means of calefactive oxidation test of coal samples, the characteristics of different samples spontaneous combustion are analyzed; the infrared spectrum is assimilated to review the rule that coal function corps change in the process of coal low-temperature oxidation ; by the means of thermal analysis by differential scanning calorimeter, thermogravimeter, the kinetic function of coal low-temperature oxidation in spontaneous combustion process are analyzed , depend on the device, the mathematical model of coal spontaneous combustion is developed, the model are dealt with, Finally, the temperature field and the velocity field with velocity of the entry flow is got.

论文通过煤的低温氧化和自燃过程，实验研究了煤的低温氧化气体产物特征和变化规律，研究得出了煤的低温氧化过程中气体生成量与氧气消耗量与煤温之间的指数关系式；在煤的低温自热氧化过程中，对煤的官能团等化学结构的变化研究，揭示了煤炭低温自热氧化化学基团变化规律；采用非等温TG和DSC法研究了烟煤低温氧化动力学，得出了煤低温氧化分布活化能及煤低温氧化机理函数的变化规律；建立了煤低温氧化自热数学模型，并对该模型进行数值解算，可得煤样的温度场与速度场随入口风量变化情况。

The results of experiment show that the method can be used as the guideline to the engineering practice.(2) The subsectional concentrative parameter method is presented.

应用了分段集中参数建模的方法，推导了数学模型，在管路分段数适中的情况下，其模型建立更利于工程理解和应用。

The paper also advances the improving arithmetic contrapose the analysis hereinbefore.The paper develops the integrated systems simulating mathematical model to make the simulation and study of characteristic and control of ship electrical propulsion on this condition.

利用各个子模块数学模型构建了完整的船舶电力推进系统仿真模型，在此基础上进行了船舶电力推进特性与控制的仿真研究。

In order to investigate the effect of temperature on the vitamin C in jujube juice and decrease the loss of vitamin C in the processing of jujube juice, the thermal degradation kinetics of Ascorbic Acid at 303, 313, 323, 333 and 343 K in the clarified jujube juice were investigated, and a mathematical model to predict Dehydroascorbic Acid concentration was also established.

为了了解加热温度对红枣汁中维生素C含量变化的影响，降低红枣汁在加工过程中维生素C的损失，该文以红枣澄清汁为材料，采用可逆的一级反应模型研究了不同加热温度下还原型维生素C的降解规律并推导出氧化型维生素C含量变化的数学模型。

The Schiff base transitional metal complexes of various structures and their metallomicelles as peroxidase models for the phenol and phenolic derivant oxidation have been investigated. Some results are obtained from the studies:(1) the Schiff base transitional metal complexes have high catalytic activity for the phenol and phenolic derivant oxidation, and the structure of the complexes has a great effect on its catalytic activity;(2)a novel kinetic mathematical model for the complexes and their metallomicelles catalyzing the phenolic derivant oxidation has been established;(3) the feasibility and mechanism for the phenolic derivant oxidation catalyzed by the metallomicelle(as the mimetic model of peroxidase)have been discussed.

研究了冠醚Schiff碱金属配合物作为过氧化物酶的模拟模型对酚类物质氧化反应的催化作用，取得如下结果：(1)几种冠醚Schiff碱金属配合物对催化酚类物质氧化具有良好的催化活性，其中配体结构对其催化活性有较大的影响；(2)建立了金属配合物与表面活性剂形成的金属胶束催化酚类物质氧化反应的动力学数学模型；(3)探讨了金属胶束模拟过氧化物酶催化酚类氧化反应的可行性及其机理。

Using lumped-parameters method according to the parameters at the outlet of desuperheater and the control volume approach, the dynamic models of desuperheater were established . Enthalpy was used as the main variable in the model, thus many uncertain parameters could be avoided.

以减温器出口参数为集总参数的建模方法和分多段集总参数建模方法，分别建立了减温环节的动态数学模型，模型以焓值为主要变量，避免了大量不确定参数的引入。

This paper analyzes the principle of the LP-LFC process,presents the physical and mathematical models of mould filling of the new process. The patterns including window-plate, ladders cluster, electromotor frame and exhausting manifolds are poured using LP-LFC process with AZ91D alloy, and the mould filling course is tracked with electrode touch point method. Based on above tests and experiments,the casting defects including short runs, cold laps, trapped gas,metal penetration, and so on, were investigated. The appearance characteristics,birth causes and influence factors of above defects are discussed in the article,diagrammatize modes of the defects forming is also given, and the measures of reducing or avoiding defects are put forward.

本论文分析了低压消失模铸造技术的工艺原理，建立了低压消失模铸造过程中金属液充型的物理和数学模型；在各种工艺条件下浇注了薄板窗体、阶梯模样簇、电机外壳和发动机排气管四个典型的模样和产品，用电极触点法记录了镁合金低压消失模铸造的充型过程；试验研究了镁合金低压消失模铸造中出现的浇不足、冷隔、气孔、粘砂等典型缺陷，分析了这些缺陷的形貌特征、形成原因及影响因素，给出了缺陷形成过程的图解模型，提出了减少和消除缺陷的工艺措施。

According to capability of the circuit of DC motor, build the model of DC motor; designed the speed-current double closed loop system based on the model of DC motor; analyzed the method to solve the problem of discontinuousness of current.

二、根据直流电机回路，建立电动机的数学模型；针对该电动机模型，选用速度——电流双闭环控制系统，建立双闭环系统的控制方框图；分析晶闸管相控整流方式中出现电流断续现象的解决方法。

The robotic Denavit-Hartenberg theory was firstly introduced to describe the Tooling virtual assembly procedure. Then the Tooling assembly mathematical model was established based on the Denavit-Hartenberg inverse kinematics and virtual assembly space constraint relationships for describing the position of robots theory in 3-D space. And to solve the problem of length discontinuousness of standard parts, the position adjustment strategy for Tooling vacuum group was studied and presented.

首次引入机器人运动学Denavit-Hartenberg模型，基于反向运动学原理和虚拟装配的空间约束关系，建立了Tooling空间装配的数学模型，并根据Tooling装配所用标准件长度不连续的特点，进一步给出了Tooling吸盘组件的空间位置调整策略。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷