混合式教学方式促进了传统的课堂教学形式和现代化的网络教学的结合，疫情下，基于SPOC和直播授课的“电工技术基础”课程的混合式教学改革值得探索。在公共基础课“电工技术基础”教学实践中，通过SPOC和直播课程结合，实施以知识体系化构建为基础，以理论与实际结合为目标，具有多维互动的教学过程、多元化的教学资源、多样化的考核方式的特点的课程教学改革实践，发挥了学生主观能动性，提高了学生的参与意识，达到了较好的教学效果。

This paper implements two kinds of memristor-based colpitts oscillators, namely, the circuit where the memristor is added into the feedback network of the oscillator in parallel and series, respectively. First, a MULTISIM simulation circuit for the memristive colpitts oscillator is built, where an emulator constructed by some off-the-shelf components is utilized to replace the memristor. Then the physical system is implemented in terms of the MULTISIM simulation circuit. Circuit simulation and experimental study show that this memristive colpitts oscillator can exhibit periodic, quasi-periodic, and chaotic behaviors with certain parameter’s variances. Besides, in a sense, the circuit is robust with circuit parameters and device types.

A simple circuit based on a memristor and constructed from colpitts oscillator is investigated in this paper. The evolutions of impedance and current-voltage characteristics of the memristor are studied, the phase trajectories of the state variables in this circuit are presented, and the bifurcation diagrams with different parameters and initial conditions of memristor are illustrated. With the variances of the circuit parameters and the initial conditions of memristor, the circuit shows different dynamic behaviors such as period, period doubling bifurcation, chaos, etc. And there coexist periodic windows in some regions of chaos. Numerical simulation results depict how the dynamic properties are dependent on the circuit parameters and initial conditions of the memristor in detail. Moreover, the circuit shows some colpitts like and unlike oscillating properties. Finally, the circuit simulating experiment and conclusion are carried out in this paper.

In this letter, we study the chaotic behaviors in the fractional order memristor based MLC system with cubic nonlinearrity. We find that chaos exists in the fractional order memristor based MLC system with order less than 3. The lowest order we find to have chaos in this system is 1.5.

A PWL (PieceWise Linear) model of the new found memristor is proposed in this article. A simple second order circuit containing an inductor, a capacitor, a resistor and a memristor serves as an example to illustrate the application of this model. The circuit equation is established then Matlab simulation is performed. It is believed from this example that the model could provide satisfactory result for analyzing circuits containing memristor(s).

In this paper, Murali-Lakshmanan-Chua circuit is modified by replacing Chua's diode with a memristor. Simulation results demonstrated that chaotic attractors could be generated in the modified circuit.

In this letter, we study the chaotic behaviors in the fractional order Mackey-Glass system. We find that chaos exists in the fractional order Mackey-Glass system with order less than 1. The lowest order we find to have chaos in this system is 0.1. Two simple but effective feedback control methods and a lag synchronization scheme in this system are also studied.

In this letter, we study the chaotic behaviors in the fractional order logistic delay system. We find that chaos exists in the fractional order logistic delay system with order less than 1. The lowest order we find to have chaos in this system is 0.1. Two simple but effective feedback control methods and a lag synchronization scheme in this system are also studied.

In this letter, we study the chaotic behaviors in the fractional order MLC system. We find that chaos exists in the fractional order MLC system with order less than 2. The lowest order we find to have chaos in this system is 1.2. A simple but effective linear feedback control and a master-slave synchronization of chaos in this system are also studied.

Routing problem is a very import problem in the network design. However, with the increasing of the number of vertices, the convergence speed of the conventional method (such as the Dijkstra algorithm) becomes slow. In some services, the accurate shortest path isn't requested. This paper presents a new algorithm for solving this problem based on the tabu search technique. The tabu search algorithm can get the satisfied path with the changing of the iteration times, the tabu period and neighborhood size. Simulation results demonstrate that the proposed method is very efficient for computing the shorted path, especially when the scale of the network is large.

A fuzzy tabu search method is presented in this paper for solving the assignment problem. The proposedfuzzy tabu search technique uses a fuzzy method in the determination of the tabu period and the selection of the neigh-borhood. A numerical example is provided to demonstrate the performance of the proposed method.

The van der Pol (VDP) equation is a nonlinear differential equation, and it is also the mathematical model for an audion circuit. It has been paid much attention by researchers and has been widely used in many fields. In this paper, using the noted Poincare-Bendixson theorem, we propose a new proof of the existence of closed trajectory in the van der Pol oscillator when damp value is positive (mu>0). By comparison, we can find that, our method is natural and simple.

根据某地区地方电网(包括7个县级电网)规划的需要,基于逐步倒推的启发式方法进行了电网结构的规划.实践证明,此方法在地方电网结构规划中的应用是切实可行的.

目前广泛应用的电网规划方法大致可分为启发方式和数学优化方法两类[1],其中,启发方式比较接近于工程人员的思路,可以根据经验和计算分析给出较好的设计方案,具有直观、灵活、计算时间短的特点,便于工程人员参与决策且能够给出符合实际的较优解,易于地方电网规划人员接受和掌握[2].本文采用启发方式进行地方电网结构规划,取得了一些经验.

根据泛函网络的网络结构模型及算法,给出一种近似二阶微分系统的解,采用泛函网络方法进行数值近似,得出了较好的结果.实验研究表明,泛函网络比BP网络的近似性能好.

研究了具有振荡激活函数的离散时延简单神经元方程周期解的失稳和混沌现象,数值仿真的结果表明:在这种一阶非线性时延动力学系统中产生新的混沌发生源.给出了系统的波形图、相图及最大Lyapunov指数图.

对冲激函数的两个性质进行了推广,得到了关于冲激函数导数的两个定理,并将这两个定理进行了综合.