CA6140车床数控改造中机械装置设计技巧

介绍了普通车床数控改造中机械装置的几个独特设计，使得数控车床纵向进给系统结构更简单、性能更可靠、装拆更方便。     

Positive <Emphasis Type="Italic">L</Emphasis><Subscript>1</Subscript>-gain filter design for positive continuous-time Markovian jump systems with partly known transition rates

The paper is concerned with the problem of positive L ₁-gain filter design for positive continuous-time Markovian jump systems with partly known transition rates. Our aim is to design a positive full-order filter such that the corresponding filtering error system is positive and stochastically stable with L ₁-gain performance. By applying a linear co-positive Lyapunov function and free-connection weighting vectors, the desired positive L ₁-gain filter is provided. The obtained theoretical results are demonstrated by numerical examples.     

矿山物联网服务承载平台与矿山购买服务

矿山综合自动化系统由于没有考虑容纳第三方的服务,逐步显露出系统封闭、标准不一、信息应用困难、对矿山技术人员要求高等问题,阻碍了其发展。明确了矿山物联网的本质为服务承载平台,矿山物联网应具有相应的公共服务能力,包括基于位置的服务、基于时间的服务、基于信息的服务、基于云的服务、基于大数据的服务、基于语义的服务等,重点论述了矿山物联网应具备的服务能力和矿山购买服务,指出这些服务能力会随着技术和需求的发展而不断充实与增加,使矿山物联网逐步向智慧矿山迈进。     

西江航道封开段整治工程检测实践与探讨

结合西江(封开境内)航道整治工程第三方检测的实施过程,对航道整治工程第三方检测工作的流程和方法进行了探讨.     

Efficient bidirectional quantum secure communication with two-photon entanglement

An efficient bidirectional quantum secure communication protocol is proposed with two-photon entanglement. Compared with the previous protocol proposed by Shi et al., our protocol can achieve higher efficiency. Meanwhile, for the same length secret messages, only half of entangled photon pairs need to be prepared in our protocol. And the number of classical bits in public classical communication is also a half of that in the previous protocol. Moreover, the information leakage does not exist in our scheme.