虚数

From the lumped equivalent circuit model, the phase shift/attenuation and impedance characteristics of the novel structure are first analysed based on the Bloch theory, which shows the novel structure has properties analogous to those of a bandpass filter: the attenuation constant keeps zero with a continuous and smooth characteristic impedance distribution within the passband and the bandwidth may be arbitrarily specified; characteristic impedance is purely imaginary with the inhibition of the electromagetic wave propagation outside the passband.

首先从一般的等效电路模型出发，根据Bloch周期性理论对该结构的相移、衰减和阻抗特性进行了分析，结果表明该新结构具有类似带通滤波器的特性：通带内衰减常数为零，特性阻抗为实数并随频率连续平滑分布，具有可任意指定的阻抗匹配带宽；带外特性阻抗为纯虚数，电磁波传播受到抑制。

This paper studys the stability of nonlinear systems in two particular critical cases. In a case, the linear systems at the equilibrium point of interest is assumed to possess a simple zero eigenvalue. In the other case, it is assumed to possess a complex conjugate pair of simple pure imaginary eigenvalue.

本文基于中心流形定理研究了非线性系统在两种特殊临界情形下的稳定性问题，一种是与它相应的线性系统在平衡点仅有零特征根，另一种是与它相应的线性系统在平衡点仅有一对共轭的纯虚数特征根。

One approach to treat material viscosity is to assume the elastic constants as complex constants, in which the real part is the elastic constant and the imaginary part is the viscosity that is related to the frequency.

处理材料粘性的一般办法是将粘性项作为虚数部分插入到本构关系中，从而使得原来的弹性常数转变成了复弹性常数。

We have to distinguish between the propagating modes with real valued , and the evanescent modes with imaginary

我们必须分别考虑具有实数β的导模和具有虚数β的消失模。

All this is not imaginary, it is daily and hourly reality.

这一切是不是虚数，是每天和每小时的现实。

Based on a brief review on developments of number system, a new developed pattern is proposed. The quaternion is extended to a matrix form aI+bA+cB+dC, in which the identity matrix I and three special matrices A, B, C correspond to number 1 and three units of imaginary number i, j, k, respectively.

在数系发展的基础上，提出了一种新的发展模式：四元数推广为矩阵形式aI+bA+cB+dC，其中单位矩阵I和3个特殊矩阵A，B，C分别相应于数1和虚数单位i，j，k。

Is the real part and y is the imaginary part of a complex number.

在Python中被表示为 x + yj，其中x是实数部分，y是虚数部分。

If a is zero, the number is called a pure imaginary number.

如果a为0，这个数就称作纯虚数。

An object containing two floats, representing real and imaginary components of a number.

这是个包含有两个浮点数的对象，分别表示数字中的实数部和虚数部分。

So I is an imaginary number.

所以i是一个虚数并不真正存在

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。