Coexistence of multiple bifurcation modes in memristive diode-bridge-based canonical Chua’s circuit

Based on a memristive diode bridge cascaded with series resistor and inductor filter, a modified memristive canonical Chua’s circuit is presented in this paper. With the modelling of the memristive circuit, a normalised system model is built. Stability analyses of the equilibrium points are performed and bifurcation behaviours are investigated by numerical simulations and hardware experiments. Most extraordinary in the memristive circuit is that within a parameter region, coexisting phenomenon of multiple bifurcation modes is emerged under six sets of different initial values, resulting in the coexistence of four sets of topologically different and disconnected attractors. These coexisting attractors are easily captured by repeatedly switching on and off the circuit power supplies, which well verify the numerical simulations.     

螺栓连接结构的抗冲击简化算法

为了简化设计初期的螺栓连接结构中螺栓的抗冲击仿真计算,提出了一种新的螺栓连接结构抗冲击简化算法。通过对算例的分析,得出该算法具有模型简单、计算量小等优点。     

Connection Management Protocols for Dynamic Lightpath Provisioning in Future WDM Networks

This paper investigates and compares the performance of two GMPLS-based distributed control and management protocols for dynamic lightpath provisioning in future IP networks. The first protocol is a global information-based link state approach that consists of both an integrated RWA algorithm and a signaling algorithm. Two triggering mechanisms for the LSAs update procedures are considered; one is periodic-based and the other is threshold-based. The second protocol is a local-information based fixed alternate link routing approach where the signaling protocol is closely integrated with the RWA protocols.     

Ethernet/IP工业以太网的研究及应用

介绍了工业以太网的发展改进状况,对Ethernet/IP这种新型工业以太网的协议模型及其采用的"生产者/消费者"通讯模式和面向"连接"的,CIP(Common Industrial Protocol,CIP)报文通信机制做了详细分析,同时指出了Ether-net/IP网络应用在工业控制领域的优势。提出了Ethernet/IP工业以太网在高速公路隧道监控中具体的组网方案和通讯设置手段,利用Ethernet/IP网络成功地实现了对该高速公路隧道的良好监控。     

电子设备机房各类接地同一地网共母线与不共母线的对比分析

根据电感电位降原理和欧姆电位降原理 ,分析研究了雷电流脉冲不能忽略时电子设备各类接地采用同一地网共母线接地技术与不共母线接地技术的差异 ,得知电子设备各类接地应采用共网不共母线技术。     

阳泉市政府信息网系统的设计

从网络总体结构、软件平台选择、软件集成、WEB数据库连接、VOD试验和网络安全管理等方面就阳泉政府信息网建设中的软件系统进行了设计和论述.     

900MHz高频低损耗声表面波滤波器

介绍了在３６°ＹＸＬｉＴａＯ＿３基片上采用镜像阻抗连接换能器结构研究制作出９００ＭＨｚ高频低损耗声表面波滤波器，插入损耗小于５ｄＢ、带外抑制优于５０ｄＢ。     

Selective Digital Filters with Linear Phase

A method for synthesis of digital bandpass and bandstop filters obtained by parallel connection of two allpass networks, is considered. A procedure is based on allpass network linear phase approximation at three levels in mini-max sense, which enables obtaining of selectivedigital filters in form of elliptic filters with linear phase in both passband and stopband.     

Capacity Analysis for Connection Admission Control in Indoor Multimedia CDMA Wireless Communications

In this paper, the capacity analysis for connection admission control is presented for the reverse-link transmission of a packetized indoor multimedia wireless communication system using direct sequence code division multiple access (DS/CDMA). Since CDMA is interference limited, the signal-to-interference-plus-noise ratio criterion is used to check if there is enough system resources (i.e., the CDMA channels and received signal power) for each new connection request. Taking into account the stochastical nature of multimedia traffic, the effective bit rate is used to characterize the resources required by each mobile user and a linear approximation is then used to find the total resources required by all the mobile users already admitted to the system and the new connection request. Transmission errors due to both base station buffer overflow and wireless channel impairments are considered. The capacity of multimedia traffic is determined in such a way that the utilization of the system resources is maximized and, at the same time, the required transmission bit error rate and transmission delay of all users admitted to the system are guaranteed. Computer simulation results are given to demonstrate the performance of the proposed method for capacity analysis.     

Displacement control of a mobile crane using a digital hydraulic power management system

The Digital Hydraulic Power Management System (DHPMS) is an innovation that is claimed to significantly improve the energy efficiency of hydraulic systems. It is based on digital pump-motor technology but has multiple independent outlets; hence, the transformer function can be realized as well. A new idea is to connect the outlets of the DHPMS directly into the cylinder chambers without any throttling valves in order to minimize hydraulic losses and to enable energy recovery. This article introduces the first experimental results of using this direct connection approach. Firstly, the system under study is presented and then a method for the displacement control is proposed. Open-loop position tracking responses with different loadings are presented, as is an analysis of the accuracy of steady-state velocity tracking. In addition, energy losses in the system are studied. The results show that the technique is valid. Moreover, the open-loop positioning error is under one percent in the measured trajectories, even though the DHPMS used has only six pistons. However, more pistons will be needed to improve the control of low velocities and to reduce the pressure ripple. On/off valve technology is a challenge, and compact, fast and leak-free valves with high flow capacity are required.