draw_lines3d

DISCRETE ELEMENT METHOD AND ITS PRACTICE ON EDEM3

说明：  今天给大家带来使用文本文件作为数据源的 ComboBox中国城市三级联动的代码。 1.地区库更新非常方便，不会影响到其他功能（区划代码是唯一的）。 2.文本文件读取来速度很快。(n the past, I used VB6 to write an example of three-level linkage of ComboBox in Chinese cities, using MDB database. A few years ago, the code, the regional database is not the latest. Today we bring you the code of ComboBox, which uses text files as data sources, for three-level linkage of Chinese cities. 1. The regionalization library updates are very convenient and will not affect other functions (regionalization code is the only one). 2. Text files are read very fast.)

VB的下载程序,从任何网站都可以下载网站页面(VB download file)

该程序全面仿真了蜂窝小区，主要是信道分配、切换等(The program overall simulation of a honeycomb village, mainly is the channel allocation, switch, etc )

在三条径的瑞利信道中，对于直接序列扩频： (1) 请设计DS-CDMA一种具体的码分导引辅助的信道估计方法，接收机分别采用等均益合并、最大比合并。用Simulink进行仿真，测量BPSK的误码率性能，画出比特信噪比与信道估计均方误差的关系曲线，画出比特信噪比与误码率的关系曲线，请解释在误码率为0.01时，两种合并方式所表现的不同的物理意义。 (2) 设频率已经同步，请设计DS-CDMA一种具体的单停顿滑动相关时间同步方法，用Simulink进行仿真(自己编写代码S-Function方式)，分析所设计方案的时间同步精度，画出比特信噪比与捕获概率的关系曲线。 (3) 设时间已经同步，请设计DS-CDMA一种具体的频率方法，用Simulink进行仿真(自己编写代码S-Function方式)，画出比特信噪比与频率同步误差的关系曲线。 (err)

仿真了均匀线性阵的波束形成，对比了不同加权下的波束形成。可以改变来波方向，效果明显。(Simulation of a uniform linear array beamforming, comparison under different weighting beamforming. You can change the direction of the incoming wave, the effect is obvious.)

D2D通信实现资源分配算法的有关代码，用于提高下一代蜂窝网络中的频谱利用率的解决方案是设备到设备D2D(Device to Device）通信。(D2D communication implements code related to resource allocation algorithms. The solution for improving spectrum utilization in next generation cellular networks is device-to-device D2D (device-to-device) communication.)

提取归一化中心矩——对平移和放缩有良好的不变性，我感觉比HU矩要简单可靠，请各位指正。qq254730570(Extraction of normalized central moments- on the Pan and zoom invariance good, I feel HU moment than to a simple and reliable, please correct me. qq254730570)

Create Manifest for VB6 in code by famous VB guru Lavolpe

这是用Matlab自己搭建的直驱式风力发电并网逆变器的仿真模型，效果挺不错的。-It is built using Matlab own direct drive wind power inverter with the simulation model, the effect is very good.(This is a simulation model with a the Matlab build their own direct-drive wind power generation, grid-connected inverter, the effect is very good.-It is built using Matlab own direct drive wind power inverter with the simulation model, the effect is very good.)