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首先根据高斯白噪声频率充满整个频带的特性，通过双树复小波包变换对高斯白噪声进行分解，利用频带能量泄漏的定量分析方法，验证了双树复小波包变换具有较低的频带能量泄漏特性；其次利用双树复小波包变换逐层分解信号，对每层分解所得分量求其FFT谱的峭度，得到基于双树复小波包变换的谱峭度图，根据图中峭度最大的原则，可以自动准确的选择信号分解最佳层数和最佳分量；最后将基于双树复小波包变换的谱峭度图的故障诊断方法应用于实际工程中，对齿轮故障振动信号进行分析，选择最佳分解层数和分量后利用希尔伯特包络解调，有效准确地提取了故障特征信息，验证了方法的可行性和有效性(The parameters of a filter were determined by experience, and that has a great influence on the results of signal processing. The discrete wavelet packet transform has a larger energy leakage of frequency band, which obviously affected the results of the envelope demodulation. It is necessary to have a method with a lower energy leakage of the frequency band before envelope demodulation. The dual tree complex wavelet packet transform (DT-CWPT) was a new signal processing method that had many good qualities. Because the energy leakage of the frequency band was smaller when the signal was decomposed by a dual tree complex wavelet packet transform, the dual tree complex wavelet packet transform was used to extract the fault feature information in the field of fault diagnosis. In this paper, first, according to the characteristics of Gaussian white noise, whose frequency was full of the whole frequency band, Gaussian white noise was decomposed by a dual-tree complex wavel)

CHEMKIN 2 源代码，使用Fortran语言编写，需要的可以下载(CHEMKIN 2 source code, written in Fortran, need can be downloaded)

说明：  计算时程信号数据的快速傅里叶变换，进行频谱分析(The fast Fourier transform of time history signal data is calculated and the spectrum analysis is carried out)

关于用户自定义标量输运（UDS)中非定态情况下的代码源项，主要用于非稳定流动的物质输运的耦合(On the code of the user-defined scalar transport (UDS) Central Africa steady state case the source terms, mainly for non-steady flow of the coupling of mass transport)

这是一段导线找形的命令流，可用于ansys有限元分析(This is a piece of wire to find the form of order flow, can be used for finite element analysis ansys)

说明：  comsol仿真的学习教程，有助于初学者深度掌握comsol的 基本使用(Comsol simulation course is helpful for beginners to master the basic usage of COMSOL)

用最小二乘法进行电力系统状态估计，包含IEEE30节点的电力系统图(Using least squares power system state estimation, including IEEE30 bus power system diagram)

本程序用于实现快速傅里叶变换的快速算法 ％ 为代码简便所有*2操作均直接实现，实际应采用二进制左移实现 (This procedure used to realize fast Fourier transform fast algorithm of all the code is simple to operate* 2 are referred directly to realize the actual binary left should be used to achieve)

matlab编写的流体计算和传热程序(很不错的哦)(matlab prepared and heat transfer fluid calculation procedures)

流体力学SIMPLE算法（C语言编程实现）需自己设定边界条件(SIMPLE algorithm)