理论模型

In this paper, we put forward a 2.5D model based on the hexahedron and developed an inversion method of constraint gravity-vertical fault. The inversion result is better than that the 2D model through the model tests. Based on this model, we quantitatively interpreted the Bouguer gravity anomaly of the Sierra Nevada Region in the USA.

本文从六面体模型出发，将二度体模型修改为似二度体模型，建立了一个带约束的重力－垂直断层反演模型，经过理论模型试验，证明效果要优于二度体模型的反演结果，在此基础上对美国内华达州的圣安德烈斯地区的布格重力异常资料做了定量解释。

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。

The calculated results of the discrete model accord with the experimental data well. Compared with a simple continual model, the discrete model is true of the characteristic of the flow in manifold systems, and it also shows the availability of the way to use BP neural networks to measure the key coefficient of the discrete model.

通过离散模型计算得出的结果与实验数据符合良好，说明与简化的连续模型相比，离散模型是一种更为符合并联管组流动特性的理论模型，同时也表明了用BP算法来确定离散模型关键系数的有效性。

In this paper, we put forward a 2.5D model based on the hexahedron and an inversion method of constraint gravity-vertical fault.

本文从六面体模型出发，将二度体模型修改为似二度体模型，建立了一个带约束的重力－垂直断层反演模型，经过理论模型试验证明效果要优于二度体模型的反演结果，在此基础上对美国内华达州的圣安德烈斯地区的布格重力异常资料做了定量解释。

In this topic, the dynamic analysis methods for piezoelectric vibrator are studied systematically based on the theoretical model, FEM numerical experimentation and FEM governing equation for given compound-mode vibrator, and some valuable conclusions are obtained. The main work accomplished is summarized as follows: 1.Elaborate the main modeling methods for piezoelectric vibrator and the significance and necessity to study the dynamic characteristics of piezoelectric vibrator which emphasize the urgency of this paper. 2.Take the bending deformation induced by piezoelectric ceramic as example, the energy transfer mechanism of electric energy to mechanical energy are analyzed; the motion and force transfer mechanism are analyzed for the longitudinal-bending vibrator. 3.Based on mode assumption and Hamilton principle, the coupling model of piezoelectric vibrator of linear USM is built; moreover, the equivalent circuit model is obtained and a coupling equation represents the relation between electric parameters and mechanical parameters is derived which provides foundation to match the vibrator and driving circuit. 4.Combine the constitutive equation of piezoelectric ceramic with elastic-dynamical equation, geometric equation in force field and the Maxwell equation in electric field and the corresponding boundary condition equation, the FEM control equation for piezoelectric vibrator of USM to solve dynamic electro-mechanical coupling field is established by employing the principle of virtual displacement. The equation lays the foundation to study the non-linear constitutive equation of piezoelectric ceramic driven by high-power. 5.Define the dynamic indexes of characteristic of vibrator and carry out variable parameters simulation by calculating the model parameters and the electric characteristics of vibrator are simulated according to the equivalent circuit model. By numerical experimentation, the working mode of vibration of vibrator and the shock excitation results of the working frequency band which provides the mode frequency to realize bimodal are analyzed. Detailed calculation of the electro-mechanical coupling field parameters is made by programming the FEM control equation.

本课题从理论模型、有限元数值试验、有限元控制模型等方面以复合振动模式振子为例对超声电机压电振子的动力学特性及其分析方法进行了全面系统地研究，得出了许多有价值的结论，主要概括如下： 1、阐述了目前针对超声电机压电振子的主要建模方法，对压电振子动态特性的研究意义和必要性进行了论述，突出了本文研究内容的迫切性； 2、以压电陶瓷诱发弹性体发生弯曲变形为例，分析了压电陶瓷通过诱发应变来实现机电能量转换的机理；对基于纵弯模式的压电振子的运动及动力传递机理进行了分析； 3、基于模态假定，利用分析动力学的Hamilton原理，建立了面向直线超声电机压电振子的机电耦合动力学模型，并据此建立了压电振子的等效电路模型，导出了电参量与动力学特性参量的耦合方程，为压电振子与驱动电路的匹配提供了依据； 4、从压电陶瓷的本构方程出发，综合力场的弹性动力学方程、几何方程、电场的麦克斯韦方程以及相应的边界条件方程，采用虚位移原理，建立了压电振子动态问题机电耦合场求解的有限元控制方程，为研究其大功率驱动下的非线性本构模型奠定了基础； 5、界定压电振子的动力学特性指标，对压电振子的机电耦合动力学模型参数进行计算及变参数仿真；依据等效电路模型，对压电振子的电学特性进行了仿真分析；通过有限元数值实验，对压电振子工作模态附近的模态振型及工作频率附近的频段进行了激振效果分析，找出了实现模态简并的激振频率；利用有限元控制方程，通过编程计算，对压电振子的力电耦合场参数进行了详细计算，得出了一些有价值的结论。

In short, this explorative study for self-identity concept, theory and practice is for the purpose of (1) trying to unitarily understand self-identity concept, in turn to minutely examine the new development of self-identity theory, and to introduce self-identity theories and research methods in western psychology to domestic psychology in order to cause the interest of domestic psychologist to self-identity thesis; and (2) through the empirical study on self-identity of college student, revealing the meaning of self-identity to student development, and the personality characteristics of self-identity status of student, and the characteristics and influential factors of student self-identity development, and the relationship between student self-identity status and mental health condition in order to provide the measurement of empirical study and systematic study data for self-identity researches, in turn to provide basis of theory and method for setting up the theoretical model of Chinese students self-identity; and (3) making up the gaps in empirical researches on self-identity in domestic psychology, opening up a new research domain in colleges and universities student psychology, and enrich the theory on student development researches.

总之，本文对自我同一性概念、理论和实践进行探索性研究，旨在(1)尝试对自我同一性作整合统一的理解并在此基础上，详细考察自我同一性理论的新发展，试图将西方心理学自我同一性理论的发展引入国内心理学，以引起国内学者更多的关注；(2)通过对大学生自我同一性的研究，揭示自我同一性对大学生发展的含义、大学生自我同一性状态的人格特征、大学生自我同一性发展的特征和影响因素、大学生自我同一性状态与心理健康水平的关系，进而为自我同一性的研究提供实证研究的测量工具以及系统的实证资料，为建立中国大学生自我同一性的理论模型提供理论和方法上的基础；(3)弥补国内自我同一性实证研究的空白，开辟大学生心理学研究的新领域，丰富大学生发展研究的理论；(4)当代大学生自我同一性问题的研究既是青年心理学、教育心理学和学校心理学的重要课题，也能为大学生发展和大学教育实践提供心理学依据，特别是在强调创新教育和推进大学素质教育的今天具有重要的实践意义。

By the theoretical analysis of battings' thermal resistance and the test of battings' thermal resistance at different compression condition, some advise is given to the theoretical model of battings' thermal resistance.

此外，本文通过对絮片热阻的理论分析，对前人建立的絮片热阻的理论模型提出了建议，认为絮片热阻模型的推导必须考虑接触热阻，建立了絮片传热热阻的物理模型。

A theoretical model for ST type pulse tube refrigerator is set up and numerical results are achieved with this physical model.

建立了斯特林型脉管制冷机的理论模型，对其进行了相应的有限差分数值模拟，并运用此理论模型，详细分析了小孔阀和双向进气阀开度对制冷机性能的影响，为实验研究提供理论基础； 2。

To explore factors of knowledge transfer and the relations between the factors and capacities of knowledge transfer (the maturity of knowledge management) in enterprises, the theories and methods of management and statistics were employed in the present study. Based on the analysis of processes in knowledge transfer and the core of knowledge management that refers to individuals, groups and organizations, a three-component model of knowledge transfer, which is the general model in this study, was obtained.

本研究主要探讨企业知识转移过程中的影响因素及其与转移能力的关系，基于管理学、统计学的理论与方法，从分析企业知识转移的根本过程出发，以个体、群体、组织为研究核心，从现有知识转移模型中推导出知识转移三元模型，通过10家企业的实证性研究，对这一理论模型进行了验证。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。