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In this dissertation, solar chromosphere-corona models are extended to spherical geometry for the first time. By using time-dependent, compressible MHD simulation, we numerically study, either 2-dimensionally or 3-dimensionally, the local and global propagation processes of the disturbances in solar atmospheric models.

本文首次将太阳色球层-日冕模式推广到球坐标情形,利用时变可压缩磁流体动力学模拟,对太阳大气模式中扰动传播的局地及全球问题进行了二维和三维数值研究。

In order to simulate the global characteristics of wave propagation in solar chromosphere-corona, by employing a 2-dimensional MHD simulation subjected to a self-consistent non-isothermal, non-uniform initial state in spherical geometry, we study numerically the global propagation process of disturbances initiated by a pressure pulse implemented at the bottom of chromosphere.

在球坐标中一自洽的非等温非均匀等离子体初态下,应用二维理想磁流体动力学全球模拟,对色球底部压力脉冲引起扰动传播的全球问题进行了数值研究。

Study of vortex dynamics of high-temperature superconductors is one of the most important and active fields of superconductivity.

高温超导体的磁通动力学性质的研究是超导电性研究的一个重要方面,具有理论和应用两方面的重要意义。

The main characteristics include: the quiet Sun corona has a rapid response to the flare heating, within 2 second the corona temperature increases nearly one order of magnitude, but later such increase becomes very slowly; the downward velocity at early stage of impulsive phase is too small to be negnected; chromospheric evaporation made by conduction shows some intensely, the maximum evaporated velocity may be as large as 1000 km/s; the chromospheric condensation appears just when the chromospheric evaporation takes place and its place always coincide with that of transition region in the early stage; the maximum of chromospheric condensation occurs also in the early stage of impulsive phase, at which the density in condensation may be larger two order of magnitude than that of surround and the downward velocity may be as large as 100 km/s; after the maximum of chromospheric condensation, its strongth decreases gradually but its width becomes greater with time and have a tendency to transport into deep chromosphere; the front of chromospheric condensation heats atmosphere obviously and the temperature in the chromospheric condensation is higher than the original case; the downware velocity of transition region may be greater than 100 km/s at the early stage; when the evaporated material collide at the top of loop, the densityand the presure there increase rapidly, which result in the formation of a shock wave; and so on.

在改善色球辐射损失和精确分辨过渡区的基础上,通过联立求解连续性方程、动量方程和能量方程,构造了一维磁限制性耀斑环在热沉积作用下的大气动力学模型,获得了耀斑热模型下脉冲相早期较为细致的大气演化理论图象,其主要特征是:耀斑对宁静日冕的加热相当迅速,仅2秒钟日冕温度增加即达一个量级,之后日冕温度增加缓慢;脉冲相早期日冕向下速度很小,几乎可以忽略,热传导驱动色球蒸发,其过程较为激烈,蒸发极大速度可达到1000km/s;色球压缩区与色球蒸发几乎同时形成,且在早期其位置总是与过渡区位置重合;色球压缩极大发生在脉冲相早期,其时密度可高于周围约2个量级,向下速度可超过100km/s;色球压缩极大后,其强度逐渐减弱,但宽度明显增大,且渐渐脱离过渡区往色球传播;压缩区内物质温度要高于原先的大气温度;过渡区下降在脉冲相早期相当迅速,可超过100km/s;当蒸发物质在环顶高速相碰时,环顶的密度、压力迅速增大,且温度也有所增加,导致形成激波,其波面以每秒上百公里的速度自环顶向下传播;在脉冲相前期,日冕软x辐射对色球的加热作用可以忽略;等。

On the basis of magnetic hydrokinetic equations,this paper calculates the dispersion relations of symmetrical unmagnetized cold plasma,and observes the transmission rules of electromagnetic waves in it by the dynamic PIC parti- cle simulation method.

从磁流体动力学方程出发,计算均匀非磁化冷等离子体的色散关系,并采用PIC粒子模拟方法动态观察电磁波在其中的传播规律。

In this paper, a dynamic model of the gas-solid two phase flow in magnetically fluidized bed is established first.

本文首先从理论上建立了磁流化床气固两相流动的动力学模型。

From these dynamic solutions, frequency and mode shapes of sectorial plate and sectorial annular plate under boundary conditions of GSS and GRS are derived. The three-dimensional exact solutions of the displacement, electric potential, magnetic potential, stress, electric displacement and magnetic induction of equilibrium problems are also obtained.

由动力学的一般解,导出了扇形板和扇形环板在广义弹性简支和广义刚性滑动边界条件下自由振动的频率方程和振型;并得到了平衡问题的扇形板和扇形环板在两种边界条件下的位移、电势和磁势,应力、电位移和磁感应强度的三维精确解。

During the motion process, the stagnation and back commutation occur and worsen the performances of circuit breaker. According to the real interruption process, a three-dimensional(3-D) model of arc motion under the effect of external magnetic field is built based on magnetohydrodynamic, which can predict the restriking phenomena. With air vents opened to 60%, the restriking phenomena occur under 3mT magnetic field; when the magnetic field is increased to 5mT, the restriking phenomena disappears.

该文以磁流体动力学为基础建立了三维空气电弧等离子体在外部磁场作用下运动的数学模型,此模型可以预测电弧的重击穿现象,并发现当灭弧室的出口面积为60%时,电弧在3mT磁场的作用下运动时出现了重击穿现象,而当磁场增大到5mT时重击穿现象消失。

The dynamic scaling method was used to characterize the surface roughening of two kinds of films.

用磁控溅射工艺分别在Si和Al2O3衬底上沉积两种不同织构组分的多晶柱状Cu膜,基于动力学标度方法表征两种薄膜的表面粗化特征。

Based on the theory of magneto-hydro dynamics and real welding conditions,a three-dimension united mathematical model of TIG welding arc and weld pool was established.

根据磁流体动力学理论以及焊接的实际情况,建立了三维TIG焊接电弧与熔池的统一数学模型,避免了对电弧以及熔池界面条件的假定,使得对焊接电弧与熔池行为的分析与实际情况更近了一步。

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