61549815ppb

低雷诺k-epsilon 湍流模型方程，流体力学软件COMSOL 3.5的一个例子(This implemented Low-Re k-epsilon Comsol model is based on the Launder-Sharma damping functions as described in Wilcox s Turbulence modeling for CFD book. Model implementation was in 2D under steady state situation but it can be extended to 3D with relative ease.)

说明：  在Simulink中搭建电池估算SOP的算法，用于动力电池功率状态的预测(state of power,simulink,battery management system)

ICL7660是一款不错的正压变负压的稳压芯片，这里提供中英文资料各一份(ICL7660 is a good positive change negative regulator chip, the information provided here in English A)

一个不错的网上购物系统的源代码 (a good online shopping system source code a good online shopping system source code)

机器学习领域五本经典书籍（英文原版）电子版(Bayesian Reasoning and Machine Learning deep learning INTRODUCTION TO MACHINE LEARNING Reinforcement Learning: An Introduction Understanding Machine Learning: From Theory to Algorithms)

电路 12 13 14 章 ppt 高等教育出版社-ppt for dianlu 12 13 14

Delphi落雪效果 雪花飘落特效，逼真的Delphi下雪特效，打开程序后，屏幕上就立即飘飞雪花，雪花会自动堆积在窗口的标题栏、菜单栏等处，效果相当好。

说明：  对基于模块化多电平换流器作为逆变器采用最近电平逼近调制模式时的谐波分量进行分析，选取逆变器上、下桥臂电流，相间环流及交流输出电压波形作为研究 对象，通过理论推导出上、下桥臂电流主要具有直流分量、基波分量及 2 次谐波分量;相 间环流仅含有偶次谐波;交流输出电压波形仅含有奇次谐波。(Based on the analysis of the harmonic components of the modular multilevel converter when the closest level approach modulation mode is adopted as the inverter, the upper and lower bridge arm currents, inter phase circulation and AC output voltage waveforms of the inverter are selected as the research objects, and the current of the upper and lower bridge arm mainly includes DC component, fundamental component and second harmonic component; There are only even harmonics in the inter phase circulating current and odd harmonics in the AC output voltage waveform.)

说明：  对于一阶系统G(s)=wc/(s+wc)，设计的ADRC的仿真程序。(The simulation program of ADRC for the first order system G(s)=wc/(s+wc).)

该程序利用龙格库塔四阶算法，求解多元一次微分方程组。(The program uses the Runge Kutta four order algorithm to solve the multivariate first order differential equations.)