查询词典 graph theory

The theory of accretion disks are important for many astrophysical phenomena, including Quasars, active galatic nucleic, X-ray binary stars, and young stellar objects. The most important branch of accretion djsk theory is the stability properties of djsks. It is widely considered that the luminosity variations of various astronomical objects are associated with the instability of accretion disk. The viscosity plays an important role in the accretion disk theory, and magnetic field exists commonly in astronomical phenomena. A more realistic analysis of the stabihty of the accretion disk should include both the radjal and azimuthal perturbations because of the strong shear of viscous flow.In this paper, according to the luminosity Variations of Various astronomical objects, we study the radial-azimuthal instability of an isothermal with magnetic field. We find that the radial and azimuthal fields B〓,B〓 are mainly responsible for enhancing the instability of the magneto-acoustic modes and non-axisymmetric modes,and that pulsational oscillations are larger in the radial than in the Z direction. The model may be useful in explaining the periodic light variation of FU orionis and. T Tauri stars.

在许多天体物理现象中，例如活动星系核，X-射线双星和年青的恒星理论中，吸积盘理论起着重要的作用，而吸积盘理论中的一个重要分支是吸积盘的不稳定性理论，普遍认为活动天体的周期，准周期光变现象与吸积盘的不稳定性有关，在吸积盘理论中，粘滞起着重要的作用，而磁场是天体物理中普遍存在的现象，对于几何薄吸积盘不稳定性分析，由于强剪切流的缘故，应该包括径向和环向扰动两个方面，本文结合天体物理中的各种周期，准周期光变现象，研究了含磁场的等温薄吸积盘的径向-环向振荡不稳定性，结果表明：磁场的径向和环向分量对磁声模和非轴对称模的不稳定性的增加起着主要的作用，且径向振荡大于轴向振荡，所得结果有利于解释FU Orionis和T Tauri Stars的周期光变现象。

Main Curriculums: Higher Mathematics, Engineering Mathematics, College Physics, English, Descriptive Geometry and Building Cartography, Program Design and Arithmetic, Introduction to Java, Network Database, Numerical Analysis, Tensor Analysis, Specialty English, Document Retrieval and Utilization, Introduction to Mechanics, Theoretical Mechanics,Mechanics of Materials,Structural Mechanics,Computational Mechanics and Engineering Software, Theory of Plate and Shell, Theory of Elasticity, Composite Mechanics, Advanced Structural Mechanics,Plastic Mechanics of Structural Engineering, Fluid Mechanics, Experimental Mechanics, Vibration Theory, Soil Mechanics and Foundation, Steel Structures, Concrete Structures, Engineering Construction and Engineering Estimate, Engineering Signal Analysis and Processing, CAD of Structure, Design of Structural Optimization, Modern Testing Technologies.

专业课：高等数学、工程数学、普通物理、英语、政治、画法几何及建筑制图、程序设计与算法语言、Java基础、网络数据库、数值分析、张量分析、专业英语、科技文献检索、力学概论、理论力学、材料力学、结构力学、计算力学与工程软件、板壳理论、弹性力学、复合材料力学、高等结构力学、结构工程塑性力学、流体力学、实验力学、振动理论、土力学与地基基础、钢结构、混凝土结构、工程施工与概预算、工程信号分析与处理、结构CAD、结构优化设计、现代测试技术等。

By the end of college, we had courses on analytical mechanics, strength of materials, mechanics of structures, theory of elasticity, theory of plasticity, theory of vibration, fracture mechanics, fluid dynamics, finite elements, plates and shells, tensor calculus.

年底的学院，我们的课程分析力学，材料力学，结构力学，弹性力学，塑性理论，振动理论，断裂力学，流体动力学，有限元，板壳，张演算。

The deviation of theoretics and reality poses challenges to the traditional trade theory、growth theory and distribution theory.

这种理论与现实的背离对传统的贸易理论、增长理论和分配理论提出了挑战。

There is a new scientific theory of evolution-the theory of cellular automata : A simple procedure could be evolving into complex patterns can be accurately and easily simulate a variety of complex phenomena, from the growth of snowflakes to the universe, such as the evolution of the theory of evolution -- but often overlooked all their background-environment system stability and the supporting role of the smart set!

有一种新科学进化论－元胞自动机理论证明：一种简单但可演变出复杂样式的程序能精确、轻易地模拟出各种复杂现象，诸如从雪花的增长到宇宙的演化－－－然而所有的进化论往往忽略了其背景－环境系统的稳定而智能的支撑作用！

The theory of correlation of five viscera based on the theory of five elements were introduced in sixties of last century,which succeeded and developed the theory of five elements.

中医五脏相关学说的提出缘自20世纪60年代，是基于对中医五行学说的继承和发展的一种理论学说。

Dynamical Systems Theory: Dynamical systems theory is also known as the geometric theory of differential equations or global analysis.

动力系统理论：动力系统的理论也被称为微分方程或全球性的分析，几何理论。

This paper,based on the special assets theory and in view of the judgment of the interests incurred by sunk cost,analyzes the relationships between the access barriers and the division of markets and examines the decided cases related to the relatively dominant position theory In this author's opinion,this theory has severe defects and bugs.

依据对资产专用性理论，从沉没成本引起的利益判断、进入障碍和市场划分的关系的分析，以及对相对优势地位理论的相关判例的解析，可以看出该理论存在重大的缺陷，其实施不仅无法规范市场竞争秩序，还会造成理论和实务上的混乱。

The forming way about industry circle have some guide meaning for the present industry policy, industry circle can drive the whole develop in the area, but circle theory and practice have spatial difference. At the last of the thesis stands on the theory, contrast as much as the main questions of industry collect in reality economy, raise objectively the industry collect develop policy after explaining and analyzing as the theory judgment of analyzing industry collect.

研究产业集群的形成路径对我国当前的产业政策具有一定的实践指导意义，产业集群可带动区域的整体发展，而集群理论和集群实践存在差距，文章最后在理论的基础上，尽量对比现实经济中产业集群存在的主要问题，解释分析之余提出针对性的产业集群发展政策，以此作为分析产业集群政策的理论依据。

The theoretical basis about raising the pooling level of pension insurance The law of large numbers theory, theory of social equity and income redistribution theory provide a theoretical foundation for raising the pooling level of basic pension insurance.

提高养老保险统筹层次的理论依据大数法则理论、社会公平理论和收入再分配理论为基本养老保险统筹层次的提高提供了理论基础。

The dissecting of samples in group2 were difficult. The root of pulmonary artery and ascending aorta failed to be unfolded because fibrous tissue was tough, right and left fibrous trigone were too firm to be solved by hand. Cardiac muscle fibers couldn't be stripped along myofibrillar trajectory since they were prone to break because of their friability.

组2的心脏解剖困难，表现为纤维组织坚韧，游离肺动脉非常困难；徒手无法松解左、右纤维三角，肺动脉和主动脉根部的游离非常困难；心肌纤维坚硬、质脆，解剖时容易断离成碎块，无法沿纤维走行方向剥离。

We have battled against the odds in a province that has become increasingly violent.

我们对在一个争夺日益激烈省的可能性。