查询词典 mathematical models

Relativity can't leave Lorentz transformation such interesting mathematical game, from its beginning to its end is from mathematical game to mathematical game, it seems that he wants to use mathematical game to direct physics experiment, it seems that he wants to use mathematical game to change space and construct another universe.

相对论离不开洛仑兹变换这个有趣的数学游戏，从它的开始到它的结束全是从数学游戏到数学游戏，似乎他要用数学游戏去指导物理实验，似乎他要用数学游戏去改造空间和另造宇宙。

To strengthen mathematical symbol language analogy and symbol's suggesting function, to cultivate students' ability to transfer the mathematical narrative language to mathematical symbol language, to lead students to understand the definition of mathematical symbol and to regulate the writing of symbols will all contribute to developing mathematical thinking.

加强数学符号语言类比和符号提示功能教学，培养学生将数学叙述语言转换成数学符号语言的能力，引导学生正确理解数学符号的含义并规范符号书写，促进学生数学思维的发展。

Language in the Visual C ++ program to prepare the small company's management wages Data Structures Using C language simulation of the car park management, vehicle output reached, departure time and location C language environment in Turbo C 2.0 calculator program to prepare the basic functions, and provide visual interface SQL server database and the use of VC ++"student information management system" 2007,"Higher Education's Cup" National Mathematical Contest in Modeling (China's population growth projections) were third prizes Hubei Division Zhongnan University of Nationalities in 2006 Mathematical Contest in Modeling (the company's best production programme) won by their schools China and South Africa in 2007 by the national schools "Innovation Capability honorary title" 2006 "click space of a series of activities Poetry Speech Competition" The Excellence Awards 2006 - 2007 Zhongnan University of Nationalities professional third prizes August 2007 through selected to participate in the summer school mathematical modeling training September 2007 in "Higher Education's Cup" National Mathematical Contest in Modeling May 2006 Zhongnan University of Nationalities Mathematical Contest in Modeling Participate in the 2006 ACM Programming Contest 2006 Computer Science Institute participate in the "Click space series of activities," Poetry Speech Competition 2006 National University and South Africa to participate in "Click space series of activities," Program Design Contest China and South Africa in 2005 to join the University of the nation "Table Tennis Association"

++语言在Visual C++环境下编写程序实现小型公司的工资管理数据结构使用C 语言模拟停车场管理问题，输出汽车到达、离开时间及位置 C 语言在Turbo C 2.0环境下编写程序实现计算器的基本功能，并提供可视化界面数据库使用SQL server及VC++实现&学生信息管理系统& 2007年&高教社杯&全国大学生数学建模竞赛获湖北赛区三等奖 2006年中南民族大学数学建模竞赛（汽车公司的最佳生产方案）获学校一等奖 2007年获中南民族大学校&创新能手&荣誉称号 2006年&点击空间系列活动之诗歌演讲比赛&获优秀奖 2006年-2007年中南民族大学专业三等奖 2007年8月经过选拔参加学校暑期数学建模培训 2007年9月参加&高教社杯&全国大学生数学建模竞赛 2006年5月中南民族大学数学建模竞赛 2006年参加ACM程序设计大赛 2006年参加计算机科学学院&点击空间系列活动&之诗歌演讲比赛 2006年参加中南民族大学&点击空间系列活动&之程序设计大赛 2005年加入中南民族大学&乒乓球协会&

On this basis, according to historical data, apply ANN and differential simulation method to get the quantitatively correlative relations between each production and its own influence factors, and introduce the new methods of prediction for dynamic indexes with gas-field development (The combinatorial prediction method based on fuzzy comprehensive evaluation, the method of ANN to select optimally combinatorial prediction models and the ANN prediction method based on genetic algorithm).(2) Base on mathematical programming, combine with quantitative economics and techno-economics, introduce economical indexes to establish production"s distribution optimal model, production"s constitution optimal model and measured production"s constitution optimal model, including multi-objective models and five-years models. Upon this, the optimal project for all gas field and each gas-collected factory can be got. Also, introduce the time value of capitals to improve on these models.(3) Base on the optimal solution theory and algorithm theory for the nonlinear programming problem, introduce the SUMT algorithm and genetic algorithm to study how to solve the models, and on the basis of normal genetic algorithm, make use of auto-adaptively modulating method to improve on normal genetic algorithm; Base on algorithm"s convergence theory and calculation"s complexity theory to analyze seriatim SUMT algorithm"s convergence and genetic algorithms convergence, and compare performance with each other.

在此基础上，利用神经网络方法和微分模拟方法根据历史数据得到各分项产量与其影响因素之间的定量关联关系，并引入气田开发动态指标新的预测方法(基于模糊综合评判的组合预测方法、神经网络优选组合预测模型预测方法以及基于遗传优化的神经网络预测方法)；(2)以数学规划为基础，结合数量经济学和技术经济学，引入经济指标建立产量分配优化模型、产量构成优化模型、措施产量构成优化模型、气田开发多目标规划模型以及五年规划模型，进而获得全气田及各采气厂的最优方案，并引入资金时间价值对五年规划模型进行改进；(3)以非线性规划问题的最优解及算法理论为基础，引入SUMT算法以及遗传算法对模型的求解进行研究，并在原有的遗传算法基础上，引入自适应调整方法对遗传算法进行改进；以算法的收敛性理论和计算复杂性理论为基础，逐一分析SUMT算法以及遗传算法的收敛性，并比较三种算法的优劣性。

During the study, in order to decrease the complexity, the article simplifies the geomorphic process, defines the ideal state, and, according to the geomorphic principle, reasons out some of the 4-Dimensional Geomorphic Mathematical Sub-Models that include the 4-Dimensional Tectonic Geomorphic Mathematical Model, the 4-Dimensional Depositional Geomorphic Mathematical Model, and the 4-Dimensional Denudate Geomorphic Mathematical Model.

在研究过程中，为了减低复杂程度，简化了地貌过程，规定了理想条件，并根据地貌学原理推导了部分理想条件下的四维地貌数学模型，分别是四维构造地貌数学模型、四维沉积地貌数学模型和四维剥蚀地貌数学模型。

Based on rail/wheel reaction and track/bride reaction theory and systems engineering theory, new vehicle-track and vehicle-track-bridge system dynamic models are established and discussed in details, including ballast track model and ballastless track model. The characteristics of the models are:(1) vehicle-track and vehicle-track-bridge system dynamic models are coupled in vertical and lateral;(2) track vibration on bridge is taken in account, track on bridge is considered as one or two layer continuous-point supported rail model, according to actual track structure, interaction between vehicle and bridge transfer from track structure;(3) three type of ballastless track models (tieembanked, elastic-tie-block, slab track) are presented;(4) models reflect the main feature of actual vehicle, track and bridge structure, the response computation frequency of models is relatively broad, which can be applied to analyze both low frequency and high frequency vibration.

基于轮轨相互作用和线桥相互作用特点，本文从系统工程角度出发建立了车辆、有碴轨道和无碴轨道、简支箱梁桥垂向和横向耦合系统动力分析模型，该系统模型具有以下特点：（1）车线、车线桥体系均考虑为垂向、横向耦合振动系统，车线间通过轮轨接触几何关系耦合，轨道与桥梁间通过轨道与梁体间的力与位移协调条件耦合；（2）充分考虑桥上线路在车线桥系统中参振作用，根据桥上线路轨道结构特点将桥上轨道结构模型具体化，即对桥上轨道结构视为多层支承体系，车桥间的动力作用通过轨道结构来传递；（3）建立了三种形式无碴轨道动力分析模型，即长轨枕埋入式、弹性支承块式和轨道板式无碴轨道模型；（4）系统模型详细，分析频带宽，适用范围较广。

Growth models of virtual trees include morphological structural models, functional models and functional-structural models. Functional-structural models may simulate the interaction between trees and its environment, whose outputs are 3D structure of trees. Therefore, functional-structural models are more close to realistic tree growth process and lead the trend of tree growth modelling.

虚拟树木生长模型包括形态结构模型、功能模型和结构－功能模型等，其中结构－功能模型可以模拟树木与环境间的相互关系，其结果为树木的三维结构，因此它最为接近现实树木的生长，是虚拟树木生长模型的发展方向。

Aiming at a class of complex electromechanical systems, such as 4-high or multi-high cold mills and continual mills, we firstly construct mathematical models of every subsystems by means of structural principle modeling method; nextly, get the overall mathematical model of electromechanical drive system by joining together these subsystems'models according to coupling variables and parameters; we finally simplify the overall model according to time-scale principle which can retain main eigenvalues and significant state variables, and obtain a practical mathematical model of complex electromechanical system. By simulating the CM04 temper mill's model constructed by above-mentioned method, we test and verify that the modeling method is effective and practical. The study analyzes and researches the electromechanical coupling facts and acting laws existing in complex electromechanical system.

提出了系统的总体测试方案，设计了高保真度的信号隔离和缓冲器，解决了从大功率、大电流复杂机电系统主回路中提取真实谐波分量、而又能不影响系统正常运行的难题；发现了谐波电流对平整机工作状态的影响规律；确认谐波电流是可能引起平整机工况奇异、产生机电耦合振动、导致带材产品表面出现明暗振纹的一个因素；提出了一种多相整流电路谐波电流的分析计算方法，用该方法对平整机三相桥式整流供电电路的谐波分量进行了理论分析和计算，计算结果与实测结果能得到相互验证，说明该方法是可行的，实测结果是可靠的。

The discrete mathematical models of the roundness and cylindricity EST are established; the mathematical models of the generating line straightness, axis straightness, coaxality, circular run—out and total run—out error of the revolution workpiece are put forward and established first based on the EST; the method about how to sample and to process sampling data are given when these models are applied to measure workpleces.

其主要内容是：针对长期以来国内对回转误差运动的有关定义的争论，对回转误差运动的本质进行了讨论，进一步明确了静心与静轴，动心与动轴的概念，并对此进行了数学推导，给出了相应的数学模型；统一了"平动说"和"瞬心说"关于回转轴线的定义，指出了两种学说各自的力学基础和它们的一致性。

ABSTRACT It is very difficult to get exact mathematical models of industrial processes, models used in design procedure of control systems are commonly mathematical models through approximation.

在实际工程应用中通常很难得到被控对象的精确数学模型，在控制系统设计过程中所采用的模型常常是在一定程度上的经过近似化处理的数学模型。

Salt is good, but if the salt becomes flat and tasteless, with what do you season it?

14：33 盐本是好的，盐若失了味，可用什么叫它再咸呢？

He reiterated that the PLA is an army of the people under the leadership of the Communist Party of China.

他重申，人民解放军是在中国共产党领导下的人民军队。