Disturbance Observer-based Adaptive Fault-tolerant Dynamic Surface Control of Nonlinear System with Asymmetric Input Saturation

International Journal of Control, Automation and Systems - In this paper, a composite fault-tolerant control problem is studied for a class of uncertain nonlinear system with asymmetric input...     

视觉技术在YP19装封箱机中的设计与应用

介绍视觉技术在YP19装封箱机的装箱过程中的应用,简述视觉技术系统的基本组成、工作原理及软件设计。     

机床再制造技术框架及产业化策略研究

机床再制造实际上是一种基于废旧机床资源循环利用的机床制造新模式，对于循环再利用我国量大面广的老、旧机床设备资源以及更新提升我国制造业机床整体质量和制造加工能力具有重要意义，并将导致若干新兴产业的形成。在分析国内外机床维改再利用现状及不足的基础上，总结提出机床综合再制造流程，并建立废旧机床再制造技术框架；结合机床再制造新兴产业的发展前景，分析并提出其产业需求、产业主体、产业模式等产业策略。     

利用内置导轨的清洁机器人垂直运动控制

针对建筑物表面清洁机器人(BFMR)容易受环境和振动影响、运行稳定性差等问题,设计了安全稳定的控制系统.在垂直和水平机器人的对接过程中,利用导轨制动系统抑制冲击,并利用再平层过程补偿机器人内置导轨与建筑物表面导轨之间的定位误差.此外,利用提出的振动抑制系统,根据钢丝绳动态属性的状态估计值,控制钢丝绳的加速度,对环境噪声产生的振动进行抑制,提高垂直机器人垂直运动的稳定性和可靠性.实验结果表明,本文设计的控制系统能够有效降低振动影响,具有可行性.     

Synthesis and performance of LiMn0.7Fe0.3PO4 cathode material for lithium ion batteries

Pure and carbon-containing olivine LiMn_0.7Fe_0.3O₄ were synthesized at 600 °C by the method of solid-state reaction. Structure, surface morphology and charge/discharge performance of LiMn_0.7Fe_0.3O₄ were characterized by X-ray diffraction, scanning electron microscopy, and electrochemical measurement, respectively. The prepared materials with and without carbon both show the single olivine structure. The morphologies of primary particles are greatly affected by the addition of carbon. Large particles (500-1000 nm) and densely sintered blocks were observed in pure LiMn_0.7Fe_0.3PO₄, which made the insertion and extraction of lithium ions difficult. Battery made from this sample can not charge and discharge effectively. The carbon-containing LiMn_0.7Fe_0.3PO₄ has a small particle size (100-200 nm) and a regular appearance. This material demonstrates high reversible capacity of about 120 mAh g⁻¹, perfect cycling performance, and excellent rate capability. It is obvious that the addition of carbon plays an important role in restricting the particle size of the material, which helps to prepare LiMn_0.7Fe_0.3PO₄ with excellent electrochemical performance. The electrochemical reaction resistance is much lower in the partly discharged state than in the fully charged or fully discharged state by the measurement of ac impedance for carbon-containing LiMn_0.7Fe_0.3PO₄. It is indicated that the mixed-valence of Fe³⁺/Fe²⁺ or Mn³⁺/Mn²⁺ is beneficial to the transfer of electron which happens between the interface.     

Nonlinear optomechanical detection for Majorana fermions via a hybrid nanomechanical system

The pursuit for detecting the existence of Majorana fermions is a challenging task in condensed matter physics at present. In this work, we theoretically propose a novel nonlinear optical method for probing Majorana fermions in the hybrid semiconductor/superconductor heterostructure. Our proposal is based on a hybrid system constituted by a quantum dot embedded in a nanomechanical resonator. With this method, the nonlinear optical Kerr effect presents a distinct signature for the existence of Majorana fermions. Further, the vibration of the nanomechanical resonator will enhance the nonlinear optical effect, which makes the Majorana fermions more sensitive to be detected. This proposed method may provide a potential supplement for the detection of Majorana fermions.     

浅析余热锅炉高压汽包水位控制

为了确保机组的安全经济运行,汽包水位控制受到高度重视,但或多或少都存在一定的不足.本文主要阐述了SIEMENS V94.3A型燃气轮机机组高压汽包水位存在的问题,分析其原因并采取相应的措施,使其满足安全运行要求.     

基于本体的网络数据工作平台NetData

近年来，网格、语义网络等新技术迅速发展并日臻成熟。互联网发展焦点开始从信息的发布和互联转向知识的交互框架。随着语义网络迅速发展，世界各地各个领域的研究爱好者组成虚拟社区，对同一领域的知识信息一起协作研究。其中，对数据的整理、保存、检索、分析是实现语义网络远景的基础工作。本文为了帮助研究社区的研究人员更有效方便地加入社区的研究，利用长期帮助中国中医研究院建设专业结构化数据库群的项目中所取得的经验，结合了语义网络和数据库网格的研究，设计并初步实现了基于本体的网络数据工作平台。     

斯特林机菱形传动机构动力学建模与刚柔耦合问题求解

目前斯特林机的数字化样机广泛采用多刚体力学理论建立,忽略了运动过程中传动构件的弹性变形与内应力作用,难以准确反映斯特林机及菱形传动机构的真实工作过程。针对斯特林机及菱形传动机构复杂的运动学与动力学特性,基于三维建模技术、有限元方法和多体动力学理论建立其菱形传动机构的刚柔耦合模型。通过刚柔耦合动力学问题求解,获得了配气活塞和动力活塞的位移、速度、加速度等运动规律,分析了柔性化连杆对斯特林机配气活塞与动力活塞运动过程的影响,验证了斯特林机在启动阶段的波动情况。分析结果为深入分析连杆应力应变动态响应提供了更加准确的边界条件,也为斯特林机结构开发与优化设计提供了借鉴方法。     

Regular microarray of Au flower-like structure formed by template-assisted electrodeposition: Influence factors and their electrochemical behavior

This paper describes a template-assisted method that combines the advantages of photolithography and electrochemical synthesis to construct a wafer-scale Au flower-like structure microarray. The detailed information about the effect of concentration of electrolyte, pattern of template substrate, applied potential, and surfactant on the formation of Au flower-like microarray is investigated. The possibility of using such a microarray as electrodes for their electrochemical properties is also tested by CV experiments.