查询词典 theory model

He has taught the following courses since he became a teacher in 2001: first-order logic, modal logic, the axiomatic set theory, recursive theory and model theory.

已开课程有《一阶逻辑》《模态逻辑》《公理集合论》《递归论》《模型论》。2005年11月至2006年11月，访学于阿姆斯特丹大学逻辑、语言与计算研究所。

Therefore, this chapter, in the first place, discusses the axiomatization of theory ofevolution and introduce in detail Williams' axiomatic system about evolution. Insecond place, it discusses the dissipative theory and the hypercycle theory. Thisdiscussion is actually about a kind of semantic which is the molecular model.

因此，在这一章，首先，对进化理论的公理化形式进行讨论，详细介绍了Williams进化论的公理系统；其次，讨论耗散结构理论和超循环论，实际上是讨论了关于进化论的演绎公理系统的一种语义或分子层次的模型。

This part introduces some basic theories about MBO including Berle and Means model, property rights economics theory, incentive mechanism theory and the cost of agents theory.

更多存在合理性的有力支持，为管理层收购能够解决经营者激励不足、代理人成本过高等问题提供了基本的理论依据。

The study also summarizes the theories of rural population flow both home and abroad from the economic perspective, and makes the model of the rural population flow in the background of politics, Economy, society and culture in the transition period of China upon the binary economic structure theory, by-business theory,"push-draw"theory, anticipated revenue hypothesis, new labor force move and other population flow theories. Through the empirical analysis the study has demonstrated the economic motivations of population flow in the rural areas of Henan Province.

文章总结了国内外从经济方面研究农村人口流动的基本理论，特别是在二元经济结构理论、兼业理论、"推——拉"理论、预期收入假说、新劳动力转移理论等人口转移理论的基础上，结合中国转型期的政治、经济、社会、文化背景，构建了转型期中国农村人口流动的理论模型；经过实证分析，对河南省农村人口流动的历史过程和现状有了较为全面的认识，这对河南省农村人口流动的经济动因有了明确的认识。

The study also summarizes the theories of rural population flow both home and abroad from the economic perspective, and makes the model of the rural population flow in the background of politics, Economy, society and culture in the transition period of China upon the binary economic structure theory, by-business theory,"push-draw"theory, anticipated revenue hypothesis, new labor force move and other population flow theories.

文章总结了国内外从经济方面研究农村人口流动的基本理论，特别是在二元经济结构理论、兼业理论、"推——拉"理论、预期收入假说、新劳动力转移理论等人口转移理论的基础上，结合中国转型期的政治、经济、社会、文化背景，构建了转型期中国农村人口流动的理论模型；经过实证分析，对河南省农村人口流动的历史过程和现状有了较为全面的认识，这对河南省农村人口流动的经济动因有了明确的认识。

On the base of probabilistic and statistics results of joints and cracks, the Author modifies Block Theory. The sliding probability of Key Block is I A RSTR A CT F2 ? 5.It is put up forward that GM(l,1) Model to predict Amount of rainfall, and Markov Chain to modifY GM( 1,1 )predicting result, and then a theoretical predicting Model of amount of rainfall is firstly built. This model is applied in a situ example. It is proved that the model is very useful to predict amount of rainfall ,when ordinal array of Amount of rainfall changes in unexact index rule.

首次将节理裂隙视为有限长，借助有关岩体节理裂隙概率统计研究成果，对块体理论进行修正，确定了关键块体变为滑动块体概率计算公式为 5、本文提出采用GM（1，1）模型预测降雨量，而采用Markov链进行修正的方法，首次用该方法建立了大气降雨量预测的理论模型，并结合实例进行具体应用，解决了当降雨量的时间序列呈不严格的指数规律变化时，大气降雨量的预测问题。

It further proves the distinct element method simulation model of charging of bell-less top blast furnace is true, and indicates this mathematics model not only has great theory research significance, but also have full practical worth. The distinct element method simulation model of charging of bell-less top blast furnace is a computer model.

本文还对实际无钟炉顶高炉开炉布料进行了离散单元法模拟研究，模拟结果与实测结果也基本符合，这进一步证明了高炉无钟炉顶布料离散单元法模拟模型的正确性，并且表明此数学模型不仅具有理论研究意义，而且具有实用价值。

Hen the coupling model of RIEMS and TOPX was still online tested in Jinghe basin. By means of the scale transformation scheme on topographic index and the yielding and runoff routing theory, the coupling model uses the meteorological data simulated by a regional climate model to drive the hydrological model for predicting the daily runoff at large-scale watershed.

OPX与RIEMS的耦合模式在泾河流域进行了在线测试，借助TOPX模型中的地形指数降尺度转换和水文过程产汇流机制，耦合模式实现了利用区域气候模式模拟的气象资料来驱动水文模型进行大尺度流域日径流量的模拟。

Finally, based on the theory of Timoshenko beam, a beam model of this crankshaft is built, which is compared with solid model. The results indicate that this beam model can meet the needs of calculation precision and calculation efficiency. With this beam model, the condition in which real loads are put on the crankshaft is simulated. The displacement curves、velocity curves、acceleration curves of the main journals and the pulley of this crankshaft and torsion vibration curve of the pulley are then gained. With these curves, the dynamic characteristic of the crankshaft is analyzed. The conclusion indicates that this crankshaft has good dynamic characteristic.

最后利用Timoshenko梁理论建立了曲轴的梁单元模型，将此梁单元模型与体单元模型进行了比较，结果表明梁单元模型能够满足精确度和计算效率的要求；利用该梁单元模型，模拟了实际条件下的载荷作用时曲轴的响应，得到了曲轴各主轴颈和皮带轮端的位移、速度、加速度曲线以及皮带轮端的扭转振动曲线，分析了曲轴的动态特性，结论表明该型曲轴具有良好的动态特性。

The main research tasks and results are as follows:(1) Through comparing the stress intensity factor of compact tension specimen calculated by finite element software with the theoretical value, the feasibility of calculating fracture parameters of crack tip in ABAQUS software was verified.(2) The relationship between the elastic modulus of the material and research scale was studied based on deriving the cohesive stress theory and other relevant theories. And the elastic modulus of the material on meso-scale was determined.(3) Global model and sub-model of the finite element were built in th...e macro-scale, and stress-strain field nearby the crack tip was analyzed, and the results show that the detailed stress-strain in the crack tip could be obtained by using the sub-model technique.(4) In meso-scale, the crack growth model was also established by assuming the crack propagating along the grain boundary, and the detailed stress-strain field in the crack tip was obtained.(5) The effect of crack length on Von Mises stress, and maximum principal stress and strain was analyzed in meso-scale when equivalent KI equals 30MPa.m1/2. And the results show that except for crack tip area, the stress-strain distribution in whole specimen is not affected.

主要完成研究内容和取得成果如下：(1)利用有限元软件计算出紧凑拉伸试样的裂纹尖端应力强度因子KI值，其结果与理论值一致，从而验证了利用ABAQUS计算裂纹尖端相关断裂参量的可行性；(2)在研究内聚应力等相关理论的基础上，推导出了研究尺度与材料弹性模量的近似关系，并确定了介观尺度上的弹性模量；(3)在宏观尺度上建立了全局有限元计算模型和子模型，得到了裂纹尖端应力应变场分布，结果表明利用子模型技术获得比较准确的裂纹尖端应力应变场分布是可行的；(4)在介观尺度上利用平均晶粒尺度的方式建立了裂纹沿晶扩展模型，得到了裂纹尖端断裂过程区的微观应力应变场；(5)当应力强度因子为30MPa.m1/2时，分析了介观尺度上在裂纹沿晶扩展过程中裂纹长度对Mises应力、最大主应力和应变的影响，结果表明，裂纹扩展长度对试样整体应力应变分布影响不大，而对裂纹尖端区域有较大影响；(6)介。。。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。