中心差分

The full space calculation model, which suits for the asymmetric structure sometimes even including air below the surface of medium, can enable simulative result to approach real one. The FDTD algorithm based on the mixed ABCs is proper to calculate the transmission line where the electromagnetic wave is transmitted in order to send electromagnetic energy along central conductor. The calculation efficiency will be raised if the PML absorbing boundary condition is set on both planes of transmitting direction and so is the MUR two-order absorbing boundary condition in the other planes.

全空间计算模型是适合所有的不对称结构的待研究体的，而且包括了介质下面的空气部分，使仿真更加的接近实验真实情况；基于MUR-PML混合吸收边界条件的时域有限差分法非常适合计算传输线这种结构，因为传输线是传送电磁波的，电磁能量主要是沿着中心导带行进，因此在两个传输端面上设置PML完全匹配层吸收边界条件，在其他面上设置MUR二阶吸收边界条件，会大大提高计算效率，而且计算结果与XFDTD仿真软件计算结果相比较，基本趋于一致。

The method was applied on standard particle images, and was compared with the 2nd and 3rd order central finite difference methods.

将DMV方法运用于标准的粒子图像，并与二阶、三阶中心有限差分法进行了比较。

The expression of differential pair CM inductance on PCB is deduced under the condition of departuring ground plane center and spanning discontinuously ground plane based on the model of microstrip.

以多层板的微带线为模型，推导出在偏离地平面中心以及跨越不连续地平面的情况下，PCB上差分对共模电感的定量表达式，并对其共模噪声的特性进行了详细讨论。

Advanced course covering topics selected from: semimartingale theory, stochastic integrals, homogeneous chaos expansions, stochastic differential equations, Malliavin calculus, infinite dimensional processes, functional central limit theorems, Feynman-Kac formula, Feynman integral.

随机分析：高级课程，包括：半鞅理论，随机积分，齐次混沌展开，随机差分方程， Malliavin 微积分，，有限维过程，泛函中心极限理论， Feynman-Kac公式， Feynman积分，过滤理论的应用，无限粒子系统，量子力学，神经学中的随机模型。

This research process the ionosphere-free triple-differenced carrier phase observation which consist of double frequency GPS observations from the GPS receiver carried on the CHAMP and 40 IGS tracking stations. Besides, the tropospheric correction model, solid earth tide correction, mass center correction of the satellite, earth rotation correction and antenna phase center correction are incorporated. Finally, determine the satellite short-arc orbit with the pure geometry, kinematic, method.

本研究利用CHAMP卫星上装载之GPS接收器所接收之双频观测量与地面上40个IGS追踪站组成三次差分无电离层观测量，并改正观测量中之对流层误差、固体潮误差、质量中心改正、地球自转、天线相位中心偏差等误差量，以纯几何之动态法求定低轨卫星之短弧轨道位置。

Thirdly, proper probabilistic model is built for the bilateral stop-and-go generator and the probability properties of its output sequence are studied. It is proved that the output sequence obey strong law of large numbers and central limit theorem and that, however, the distributions of 0 and 1 in the output sequence are imbalanced, which implies that this generator cannot be used as keystream generator directly. The rate of coincidence between the output sequence and corresponding LFSR sequences, together with their first derivatives are obtained, which reveal the existence of correlation between these sequences.

最后，建立了双侧停走生成器的概率模型，研究了双侧停走生成器输出序列的概率分布性质和大数性质，证明了生成器输出序列服从强大数定律和中心极限定理，得到了生成器输出序列中0，1分布是不平衡的结论，由此指出不能将这种生成器直接作为密钥流生成器；给出了双侧停走生成器输出序列和相应的线性移位寄存器序列之间的符合率以及一阶差分序列之间的符合率，得到了符合率的表达式，揭示了这些序列的对应比特和对应序列段之间存在相关性。

By using Fourier analysis on the capability of resolution,we conclude that CSCD gives higher resolution,with respect to other symmetric finite difference methods.

从定量角度，利用Fou-rier分析方法分析了CSCD格式的分辨率，并同其他中心型差分格式比较，得出CSCD格式有较高的分辨率的结论。

A combined super compact finite difference scheme is proposed.Numerical characteristics of CSCD is analysed and compared with other symmetric difference schemes.

提出一族组合型超紧致差分格式，对CSCD的数值特性作了分析，并同其他中心型差分格式进行比较。

On the basis of thermal transmission theory,the thermal balance equation has been founded.

以传热学的基本理论为基础，建立了热平衡方程，采用完全隐式差分法对FTSR薄板坯连铸连轧生产线上隧道炉，轧制及冷却过程中的板坯中心温度和表面温度变化进行了模拟。

From the view of antenna circuit point, this paper adopts the finite difference time domain to analyze the impact on the center frequency and the bandwidth, which introduces by the radome.

从天线电路特性的角度入手，采用时域有限差分方法分析了天线罩的引入对天线中心频率、带宽比的影响。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。