Memcapacitor model and its application in a chaotic oscillator

A memcapacitor is a new type of memory capacitor. Before the advent of practical memcapacitor, the prospective studies on its models and potential applications are of importance. For this purpose, we establish a mathematical memcapacitor model and a corresponding circuit model. As a potential application, based on the model, a memcapacitor oscillator is designed, with its basic dynamic characteristics analyzed theoretically and experimentally. Some circuit variables such as charge, flux, and integral of charge, which are difficult to measure, are observed and measured via simulations and experiments. Analysis results show that besides the typical period-doubling bifurcations and period-3 windows, sustained chaos with constant Lyapunov exponents occurs. Moreover, this oscillator also exhibits abrupt chaos and some novel bifurcations.In addition, based on the digital signal processing(DSP) technology, a scheme of digitally realizing this memcapacitor oscillator is provided. Then the statistical properties of the chaotic sequences generated from the oscillator are tested by using the test suit of the National Institute of Standards and Technology(NIST). The tested randomness definitely reaches the standards of NIST, and is better than that of the well-known Lorenz system.     

生物质气化耦合CO2控制多功能系统

本文针对生物质能独特的碳氢结构特点以及现有生物质能应用技术存在的问题，提出了基于化学能、物理能梯级利用为基础的控制CO2排放的多功能系统集成原则，即：化学能、物理能梯级利用原则，化学势能梯级利用以及分步转化原则，能量释放、迁移与CO2控制一体化原则。并且基于这些原则给出了控制CO2排放的多功能系统集成典型思维流程。在本...     

基于天然气基分布式能源系统智能建筑能源物联网研究

针对常规建筑供能系统存在的不足,充分利用城市既有天然气一次能源供应管网优势,以提高总能系统效率为出发点,本文提出了基于天然气基分布式能源系统智能建筑能源物联网(NDES-SG),并提出了NDES-SG集成基本原则与关键科学问题。为诠释NDES-SG的集成、节能潜力以及系统评价方法,给出了一个范例系统,系统计算结果表明,与常规供能系统相比,NDES-SG实现节能达22.2%。NDES-SG概念为进一步提高能源利用效率与实现新一代的建筑能源供应系统提供了思路。