数学分析

At the same time, the evaluations of pavement performance with FWD are researched based on the backcalculation results. We also analyse the mathematical basic of the solvability conditions for inverse problems, the dynamic problems of pavement and the dynamic backcalculation of subgrade modulus of PFWD (Portable Falling Weight Deflectometer).

同时，采用模量反算结果进行了FWD评价路面性能的应用研究，分析了反问题有解存在的数学基础，探讨了路面动力分析问题，并对PFWD的路基模量动力反算问题进行了研究。

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。

In section four,we carry out two application stu-dies of using the dichotomously scoted IRT models to pol-ychotomous scored test data by means of dichotomizingpolychotomously scoted test data proposed in section two.

本文第四节用IRT对多级评分测验作了两项应用研究，对数学测验我们进行了项目分析，考察了该测验的信息函数，并对该测验的几种评分方法进行了比较分析。

The information about the cocoon quality most similar to the new lot cocoon can be found out to determine its cocoon cooking parameters based on the fuzzy mathematical assembly, the fuzzy correlation matrix obtained from establishing an equiform priority ratio, and data accumulated for years in the factory.

本文运用模糊数学的聚类分析和建立相似优先比，以构造模糊相关矩阵的方法，从工厂历年所积累的资料中找出与新庄口最接近的茧质资料，以确定新庄口相应的煮茧工艺参数，并联系生产实际问题作了初步分析。

Starting with the elevation of underground water resources and a safe level of mining through variable system theory, this paper analyzes the conditions of underground water resources based on the well-studied determination method of determining the two hydrographical coefficients: rainfall infiltration replenishment rate and irrigation replenishment rate. Then considering irrigation, rainfall, drainage and other related factors, a mathematical model is set up for the calculation of underground water storage,exploitation on water regulation. After analyzing the adaptability of molepipe drainage, an underground water table regulation is given out.

论文从灌区的地下水资源及其可开采量评价分析方面入手，在对两个主要的水文地质参数即降雨入渗补给系数、灌溉入渗补给系数确定方法研究的基础上，对灌区的地下水资源状况进行分析，依据灌区的灌溉、降雨、排水条件及各种现状因素，建立了地下水资源量计算的数学模型，西安理工大学工程硕士专业学位论文计算得到青铜峡灌区地下水的最大补给量和可开采量；另外对在开发利用地下水资源过程中的地下水位的调控进行了初步的探讨，在银北灌区开展对暗管排水调控地下水位的试验研究。

In this paper, the analysis methods of the structural nonlinear response, hysteretic features of the reinforced c...

本文首先较详细地总结评述了现有的非线性反应分析方法、钢筋混凝土构件的滞变特性及其数学模型以及结构非线性分析的计算程序。

This paper gives some analysis of the working process of the screw compressor with economizer, separates it into three stages: quasi-compression process of the low stage, charge-compression stage, and quasi-compression process of high stage, sets up the mathematical models and its solution of the actual process. The capability increscence of the screw compressor with R717 and R22 after using the economizer has been calculated.

在分析带经济器螺杆制冷循环系统工作机理的基础上，本文着重分析和研究了压缩机的工作过程，把带经济器螺杆制冷压缩机的工作过程分成&准低压级压缩&、&充气——压缩&、&准高压级压缩&三个阶段，并提出了反映该循环实质的数学模型，给出了求解方法，计算了R717、R22两种常用制冷工质的螺杆压缩机在带经济器后的性能增长情况。

Incurrent research, aiming at the rupture problem engendered in the shooting process of acertain 5.56mm automatic rifle, the strain and stress distributions on the cartridge caseunder the action of axial pull have been analyzed. Based on the theories of elastic-plasticmechanics and contact mechanics, a mathematic and physical model of the cartridge-caseand chamber system has been set up; and based on the platform of the general softwarepackage APDL of ANSYS for finite element analysis, a parameterized model of thecartridge-case and chamber system has also been established. The method for nonlinearFEA has been adopted to analyze the stress distribution on the entire cartridge-case andchamber system, and the method of contact element has been employed to investigate thecontact stress between the cartridge case and chamber, and then the influences of frictioncoefficient and locking space on the static and dynamic stress and strain response of thecartridge case and chamber to the action of power gas have also been discussed. On thebasis of a lot of numerical tests, a kind of element Plane13, which is concentrated incoupled computation of heat and construction, has been used finally to simulate thetransient response of the cartridge-case and chamber system to the power gas. Throughloading the temporary thermal characteristics of explosive gas in the procedure of emulate, the corresponding transient thermal stress distributed on the entire system under thecombined load of transient thermal stress and transient pressure has been obtained. Owingto these comprehensive considerations, the numerical results obtained in this paperrepresent the actual situations comparatively exactly.

本文针对某5.56mm自动步枪在工作中出现断壳的问题，分析了弹壳在轴向拉力作用下的应力应变；基于弹塑性力学及接触理论，建立了弹壳弹膛系统的数学、物理学模型，在通用有限元ANSYS软件的参数化建模工具APDL平台上，建立了弹壳弹膛系统的参数化模型；采用非线性有限元法计算了弹壳弹膛系统的整体应力，引入接触单元法分析弹壳和弹膛的接触压力，探讨了在不同的摩擦系数和不同的闭锁间隙对弹壳弹膛静、动态响应的影响；本文进行了大量的尝试，最后确定采用热、结构耦合单元Plane13，在计算中加载了火药气体的温度历程，成功的获得了弹壳弹膛系统在瞬态的热载荷和瞬态的压力载荷同时作用下弹壳弹膛系统的热应力数值解，考虑因素全面，比较真实的反映了弹壳弹膛系统在火药气体压力和热载荷下作用的情况。

The law how these factors influence the joint"s property was pointed out. A formula about the relationship between extrusion times and contamination remainder was founded. Main reason to bimetal"s inharmonic deformation was the difference of their mechanical property. Thereby, the empirical formula showing the relation between metal combination"s mechanical property and quality of joint was constructed. Integrated influence of extrusion times and metal"s mechanical property to quality of cold pressure welding joint was discussed.

在模拟结果分析和实验的基础上，对影响异种金属冷压焊焊接性的工艺因素进行了分析；探讨了诸因素对接头性能的影响规律，并且建立了挤压次数与界面污染物残留量之间的数学表达式；指出了两种材料力学性能差异是造成不协调塑性变形的主要原因，并且建立了材料力学性能与其冷压焊焊接性之间的经验公式；定性的讨论了挤压次数及材料力学性能对冷压焊接头性能的综合影响。

The mathematical models of screed unit as well as hydraulic system parts are systematically answered, including the calculation of kinetical model based on hypothesis factors and dynamical model in consideration of forces acting on the screed.

在分析液压部件环节数学模型的基础上，首次系统地推导了熨平机构环节的运动学模型和动力学模型，并对系统的数值计算结果和实验结果作了对比分析。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。