learn_struct_K2

录音程序，音频录音fft程序，并加界面显示(radio record code)

针对三维问题，建立四面体单元的有限元方法(Finite element method for establishing tetrahedron element)

这是一个求解NACA0012翼型在不同马赫数与攻角下的流场的Fortran源代码。计算格式采用了原始AUSM、AUSMDV以及AUSM+格式。为了提高计算精度，使用了不同限制器的MUSCL插值。(This is a Fortran source code for solving the flow field around the NACA0012 airfoil at different Mach numbers and angles of attack. The scheme of AUSM, AUSMDV and AUSM+ are employed for this code. In order to improve the calculation accuracy, the MUSCL interpolation with various type limiter are used.)

用于在数值分析中，对于离散点进行拉格朗日差值拟合(Lagrangian difference fitting)

说明：  通过面积加权在abaqus程序中提取温度作用数据，计算极值(The temperature action data was extracted by area weighting in abAQUs program and the extreme value was calculated)

信息是个很抽象的概念，本文介绍了熵的概念，并介绍计算方法(information is a very abstract concept, this paper introduces the concept of entropy, and the calculation method introduced)

非常实用的时域仿真法暂态分析工具，利用牛顿法求解系统的微分方程组和代数方程组，得到转子摇摆曲线，判断暂态是否稳定(Very useful time-domain simulation tool for transient analysis method, using Newton method for solving systems of differential equations and algebraic equations, the rotor swing curves, to determine the stability of transient)

一个求解Navier-Stokes不可压缩流动的代码。用Matlab编制。(It s a source code for Navier-Stokes equation in incompressilbe flow, which is written in Matlab.)

说明：  对时间序列进行滤波，去掉噪声，得到平滑后的数据(Filters a time series via Lanczos method (cosine filter).)

穿墙雷达人体呼吸检测，是生命体探测的热门研究方向，本程序用matlab仿真，模拟频率步进雷达的探测方法，通过MTI滤波滤除墙体回波，通过FFT相干积累获取人体呼吸频率(Through-wall radar to detect human breath, is a living body to detect a hot research direction, the procedures used matlab simulation, simulation stepped frequency radar detection method, MTI filter to filter out the echo wall, get through FFT coherent accumulation of the human respiratory frequency)