非数值计算

This paper discusses the analog source to quantify the optimal algorithm, and use C language implementation of the Gaussian source at different quantization levels under the uniform quantizer and the optimal non-uniform quantization step size of the numerical calculation.

文中探讨了模拟信源量化的最优算法，并用C语言实现了高斯信源在不同量化电平下均匀量化和非均匀量化的最优步长的数值计算。

A calculation method and calculation results that show that a new kind of shaped paraboloid antennas can produce a ringy radiation pattern is presented.

通过数值计算发现将抛物线绕通过焦点的非抛物线对称轴旋转而形成的赋形抛物面天线可产生环状的方向图主瓣(此主瓣指的是主瓣最大值处)。

In this chapter, we show that Perron complements of N_0~2-matrices are N_0~2-matrices. We also demonstrate the Perron complements of inverse N_0~1-matrices are inverse N_0~1-matrices with certain restriction.

第四章研究非严格广义双对角占优矩阵的Schur余的性质，对角占优矩阵是数值计算中经常遇到的一类矩阵，它的Schur余可应用于迭代法的构造。

By means of the Schlieren technique,Schlieren images of the natural convection were taken in CO_2-ethanol absorption system.

利用纹影仪光学方法，获得了乙醇吸收CO2过程中自然对流的纹影图像；并通过吸收传质流体CFD模型，应用有限元方法对气液吸收过程中出现的自然对流发生过程进行了数值计算，得到了液相自然对流发生时的非稳态流场分布和浓度分布信息。

Chapter four studies the chaotic responses in a system consisting of simple pendulum and harmonic oscillator under bounded noise excitation. Firstly, the Melnikov function of the two-degree-of-freedom system under Hamiltonian perturbation is derived. The essential condition of the autonomous system for the probable onset of chaos is obtained, the Poincare maps of the system under small Hamiltonian perturbation and the effect of increasing perturbation on the Poincare maps are studies. Then for the non-autonomous system under damping and harmonic or bounded noise excitation, the largest Lyapunov exponent and Poincare maps are calculated. From the analysis of the largest Lyapunov exponent, the critical criterion for the onset of chaos, and the conclusion that the threshold of bounded noise amplitude for the onset of chaos in the system increases as the intensity parameter of Wiener process increases are obtained. The result from the analysis of Poincare maps is in agreement with that obtained from the Largest Lyapunov exponent. The effect of varying damping coefficient and intensity parameter of Wiener process is also analyzed.

第四章研究了有界噪声激励下的两自由度单摆—谐振子系统的混沌运动，首先推导了该两自由度系统仅在Hamilton扰动下的Melnikov函数，得到该自治系统可能产生混沌的必要条件；研究了该系统在小的Hamilton扰动和增大摄动情形下的Poincare截面；然后对有阻尼、谐和或有界噪声激励下的非自治系统数值计算了其最大Lyapunov指数和Poincare截面；从Lyapunov指数分析得到了这个两自由度系统产生混沌运动的临界条件及产生混沌的临界激励幅值随Wiener过程强度参数值的增大而增大的结论，Poincare截面分析的结果亦符合Lyapunov指数分析的结论；研究了Wiener过程强度参数、阻尼系数变化对Poincare截面的影响。

The results of the studies indicate that the fluctuations of two quadrature components of light can be squeezed periodically, and this squeezability is related to the initial state of the system.

数值计算结果表明，光场的两个正交分量的均方涨落均呈现周期性的压缩，其压缩程度与系统的初始状态有关；光场光子的统计性质也依赖于系统的初始状态，光场两模之间的相关是一种非经典相关。

The differential phase shift changes as the change in the thickness of the ferrite phase shifter is calculatedwith the transcendental equation.

根据超越方程对单环非互易铁氧体移相器的差相移随铁氧体厚度的变化进行了数值计算。

In fact the advantage of our coordinates transformation method is that the effective potential is more convenient to deal with than complex boundary conditions in numerical calculations.

实际上我们采用的坐标变换方法的优点就在于把非平面界面上的边界条件转化为了更利于用数值计算方法处理的平面界面系统中的有效势场。

Using truncated cone, circular and triangular models to simulate the contact surface, the thermal contact resistance is calculated based on unstructured Delaunay triangulation gird solution and finite element method.

分别采用截锥体、圆弧形和三角形模型来模拟实际物体的接触面，利用DELAUNAY三角形非结构化网格离散温度场，并使用有限元法数值计算接触热阻。

A numerical method is presented to analyze the discharge process of REB accelerator with Blumlein forming line. This method can deal with the conducting delay of the gas switch and the impedance variation of the vacuum diode during the discharge process. We calculated the voltage waveform on the diode.

提出的分析强流电子束加速器放电过程的方法可对具有导通时延的气体开关、Blumlein脉冲形成线、阻抗非恒定的真空二极管负载组成的放电系统进行数值计算，所得负载上电压波形能较好地与实验符合

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。