不变

Objective To study the power spectrum density of blood flow ultrasonic Doppler signal using wavelet analysis. Method Doppler signal of blood flow in human common carotid artery was studied with wavelet scalogram analysis, an affine smoothing Wigner Ville transform with a constant "Q" character. Result Wavelet scalogram of blood flow ultrasonic signal had a higher distinguishability than STFT spectrogram in the low frequency portion, but had poorer decussation terms than spectrogram.

对于平稳信号的处理工具仍然是Fourier变换，但是，在实际应用中的绝大多数信号是非平稳的，现在看来处理非平稳信号的主要工具将是小波变换，这主要是因为传统的Fourier变换分析信号时，时间和频率分辨率精度是固定不变的，而利用小波变换分析信号，在信号高频段时间分辨率精度也较高，在信号低频段频率分辨率精度较高，这很符合非平稳信号的特点。

Disbursement deflator Coefficient used to convert disbursement amounts into constant dollars.

支付缩减系数用来把支付额换算成不变美元的系数。

A deflator which translates Bank commitments into constant dollars.

把世界银行承诺贷款折算为不变美元的减缩指数。

Disbursement deflator: Coefficient used to convert disbursement amounts into constant dollars.

支付缩减系数：用来把支付额换算成不变美元的系数。

These include invariant pattern recognition, image normalization, image registration, focus/ defocus measurement, and watermarking.

这些措施包括不变模式识别，图像正常化，图像配准，重点/散焦测量和水印。

The muscle deformer acts in such a way as to try and maintain volume.

肌肉在变形中维持体积不变。

We also give two other kinds of further general- izations: one is to the case of hyperbolic-type degenerate lower dimensional tori in Hamiltonian systems, and the other one is to the case where the Hamiltonian has time-dependent quasi-periodic perturbation.

在第三章中，我们利用法向双曲不变流形理论和尤建功的一个定理的光滑性表述，给出了一个同时具有法向频率和法向分量的推广的KAM定理。

Nothing is quite safe; nothing remains the same - deliciously so.

什么是相当安全；什么是不变-巧妙等。

"Impulse response ",If we input a Dirac delta function to this system, the result of the LTI transformation is known as the impulse response.

"，"如果我们给系统输入一个狄拉克δ函数信号，线性时不变转换的结果是脉冲响应。

The demand deposit interest rate remains unchanged at 0.81 percent.

活期存款利率保持不变，仍为0.81%。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。