This thesis consisted 7 paragraphs . the 1st chapter introduced the backgrounds of structure adjustment in china and expounded the relevant theory of structure adjustment . the 2nd chapter explicated the position and meaning of highway - express to national development 第一章介绍了我国进行结构调整的背景以及国内外关于结构调整的理论;第二章详细阐述了公路货运在国家经济发展中的基础产业地位,以及公路货运对于实现我国全面小康社会目标、加快城镇化进程等社会目标的作用。
This paper roughly states the theoretical basis of the teaching - studying basis of classification and mobile classes . with the instructions of the theory of structure learning , the theory of multi - intelligence and the theory of teaching in accordance with students " aptitude , the author carries out research and exploration into the teaching practice of level c students in the classification , who are slow in learning . it mainly does some research on some principles , strategies and some teaching modes of level c in order to excavate the potentiality of different levels of students , improve students " comprehensive quality , foster students " initiative and then promote students " individual development by chemistry teaching 本文从建构主义学习理论、多重智力理论及因材施教理论方面初步阐述了对分层流动走班教学的理论依据,对分层流动走班教学c层班(学习困难学生)的教学实践进行探索和研究,主要研究了c层班的教学原则、教学策略及教学模式,以期通过分层教学挖掘不同层次学生潜力,通过化学教学提高c层学生的综合素质,培养学生的学习主动性,促进学生的个性发展。
This paper researched dynamic characteristics of internal and external bracket , the carrier of laser gyro , and compared kinds of scheme of structural design applying theory of structure dynamic design and theory of optimal design and analyzed natural characteristics of internal and external bracket applying ansys finite element analysis software . and use experimentation to validate this analysis result 本文深入研究了激光陀螺仪的载体? ?内外支架结构的动态特性,应用结构动态设计理论及优化设计理论比较了各种设计方案,运用了有限元法分析了内外支架结构的强度和刚度,利用有限元动力分析软件ansys计算得到内外支架结构的固有频率和振型,并通过试验模态分析的方法进行验证。
So the only way for agricultural development is structural adjustment . under the theory of structure economy growing , the theory duality economy structure and the law of the industry structure evolution mainly , this paper , firstly , analyzes the characteristics of evolution and current situation of hubei province ' s agricultural industry structure including the evolving better , singleness , facing crisis , by stage , lack of power , crop ' s development setting back the evolution , asymmetry - structure between the production value and output , the similar structure with the whole nation and the peripheral provinces , and so on 本研究在结构主义经济增长理论、产业结构演进规律和二元经济结构论等经济学理论的基础上,首先通过产值比重结构对比、产业结构变动度、产业结构波动度、产业结构相似度和偏离系数等指标和方法,从多方面分析了改革开放以来湖北省农业产业结构演进与现状特征:农业产业结构逐步优化,但结构单一,面临危机;农业产业结构呈阶段性演进;农业产业结构演进缺乏动力;种植业成为湖北省农业产业结构优化障碍;农业产值与产量结构不对称,出现逆向变化;农业产业结构与周边省份趋同等。
In this paper , based on the previous research result , by using theory of electrochemical mechanism , probability math , reliability theory , basic theory of pre - stressed concrete structures , structure optimum design , theory of control , maintenance strategy decision theory of structures and etc . , the research on steel corrosion monitoring method , structural corrosion damage model , reliability analysis , the maintenance and repair method that based on corrosion control , the optimum structural design method of new bridge structures that consider durability and the optimum maintenance strategy decision theory are carried out . 2 . corrosion mechanism and monitoring technique it is widely accepted that the corrosion of steel in concrete structure is a electrochemical process , include the formation of anode & cathode area on metal surface and potential difference between different ' area 本文在已有理论研究的基础上,针对预应力混凝土桥梁建设及使用中存在的影响结构耐久性的实际问题,综合运用电化学理论、概率理论、结构可靠性理论、混凝土和预应力混凝土结构基本理论、结构优化理论及控制维修决策等理论和方法,详细研究了基于电化学理论的钢筋锈蚀检测方法、预应力混凝土桥梁结构的腐蚀损伤模型、可靠性分析、基于腐蚀控制的维修方法、桥梁结构方案选型及优化设计以及在役桥梁结构的优化维修决策等问题第二章混凝土结构的腐蚀机理及检测技术目前普遍认为,结构混凝土中钢筋的腐蚀是一种电化学的过程,包括在金属表面形成阳极(腐蚀)和阴极(钝化)区域以及不同区域间的电位差等。
The paper ( in chapter 4 ) will combine the principle of experimental modal analysis with the theory of structure intensity ; utilize theories in existence ; regard static issue as dynamic special issue ; decompose dynamic force issue to static force issue in mode of each rank ; realize consolidation of static and dynamic issue 论文第4章将实验模态分析原理和结构强度理论结合、利用现有理论,将静力问题视为动力问题的特例,将动力问题分解为各阶模态下的静力问题,实现静动力问题的统一。
Vibration control of high - rise structures is a new school which has quickly developed recent years , whose keystone is to change traditional methods that reinforces the strength of load - bearing structures to resist wind loads and seismical forces , which has used the theory of structures " vibration control in order to inhibiting structures " wind - induced response 高耸结构振动控制是近几年才发展起来的新兴学科。它的核心问题是利用结构振动控制理论,改变传统地加强承重结构以抵抗风振或地震的思路,而采用某种控制装置施加控制力,抑制结构的动力反应,特别是被动控制理论已经发展得比较成熟,且有很多工程实例。
According to the theory of structure vibration and the interaction mechanism of the system constituted by vibrating compactor and gravel soils , the theoretic warranty of dynamic monitoring for vibrating compaction is studied , and a data collecting system of the dynamic monitoring suited to the monitoring apparatus with acceleration transducers is established 摘要根据结构振动理论,分析了振动压实机械与被压土体的相互作用机理,研究了碎石土振动压实动态监测的理论依据,建立了一套适用于加速度监测仪的振动压实动态监测数据采集系统。
This article firstly studies the theory of structure reliability , summarizes the various computational methods , and compares them with each other . for some comparatively secondary structures whose reliability need not be known definitely , their reliability can be estimated though the method of hypothesis testing 论文首先对结构可靠度理论加以分析研究,总结出结构可靠度计算的各种方法,并对各种方法加以比较;针对某些不需要明确计算可靠度或相对次要的结构,可以通过假设检验估计法进行可靠性评估。
Using the theory of structure mechanics and other knowledge , the research analyzed and checked the bearing capacity of the model . meanwhile based the aim of cutting down the quantity of rolled steel , the research optimized the greenhouse model ' s structure , and deduced the formula of calculating . so the research reduced the cost of greenhouses 对优化的温室拱架参数应用结构力学等知识进行了理论上的承载分析和校核计算,同时以减少钢材用量为目标函数,对温室结构进行了优化设计的计算并推导了优化设计计算的基本公式,实现了温室造价的降低。