femjuxing

关于双模激光器的几个程序，可以直接使用。(Several programs for dual-mode lasers can be used directly.)

利用Matlab软件编程实现DDS（直接数字频率合成技术）。设时钟的频率为固定值f_C，在CLK的作用下，如果按照0000,0001,0010，…，1111的地址顺序读出ROM中的数据，即表1中的幅值编码，其正弦信号频率为f_01；如果每隔一个地址读一次数据（即按0000,0001,0100，…，1110顺序），其输出信号频率为f_02，且f_02将比f_01提高一倍，即f_02=2f_01；其余类推。这样，就可以实现直接数字频率合成器的输出频率的调节。(Matlab software programming DDS (direct digital frequency synthesis). Clock frequency set to a fixed value f_C, under the effect of CLK, according to 0000,, ..., 1111 of the sequence of addresses in the ROM reads the data, i.e., the amplitude of the encoding in Table 1, the frequency of the sinusoidal signal f_01 if every time a read address data (ie 0000,0001,0100, ..., the order of 1110), the output signal frequency is f_02, and f_02 f_01 than doubled, i.e. f_02 = 2f_01 rest on. This allows direct digital frequency synthesizer output frequency regulation.)

说明：  半车动力学模型，可用于动力学分析，用于分析垂向激励与整车响应的关系(half car dynamics model)

粘弹性地基结构动力响应计算程序，虽然比较老，还是很有价值。(Visco-elastic foundation structural dynamic response calculation program, though relatively old, is still of great value.)

The effects of multipath include constructive and destructive interference, and phase shifting of the signal. This causes Rayleigh fading, named after Lord Rayleigh. The standard statistical model of this gives a distribution known as the Rayleigh distribution. Rayleigh fading with a strong line of sight content is said to have a Rician distribution, or to be Rician fading.

介绍了matlab在有限元方法求解中的应用，对于有限元求解有很大的帮助(Introduced in the finite element method matlab in the application of the finite element solution for the great help)

利用差拍法求宽带阵列通道延时，可用于宽带阵列通道延时测量以及校正。(Computing the channel delay of broadband array by using beat method, which can be used for wideband channel delay measurement and calibration.)

MATLAB有限单元分析书中的源程序，简单实用，是练手的好材料！(MATLAB finite element analysis of the book source code, simple and practical, practiced hand!)

离散时间数据，采用五点样条插值，高精度时域求导。(Discrete-time data , using a five-point spline interpolation , derivation time domain accuracy. )

details of the books and communication.