EM4905芯片在射频信息解读设备中的应用

射频识别技术是无线电技术在自动识别领域中的具体运用;通过射频信号自动识别目标对象,并获取相关数据。随着天线技术及计算机技术的发展,RFID系统的体积、功耗越来越小,成本越来越低,功能日趋灵活,操作快捷方便可广泛应用于物联网中。EM4905芯片是RFID领域性价比较高的核心器件。文章主要介绍EM4905芯片的工作原理及其在低频射频信息解读设备中的应用。     

船舶气象仪电磁兼容性试验及分析

电磁兼容性是舰船设备的重要特性之一,它直接影响到舰船设备能否正常工作。文章针对船舶气象仪电磁兼容性试验数据,对初次试验中不满足要求的项目分别从船舶气象仪设备内部与外部两个方面进行分析,最终找出原因并解决了问题,使船舶气象仪电磁兼容性符合相应的技术要求。     

TMS320VC5402在加速度式波浪传感器中的应用

阐述以TMS320VC5402型DSP为核心的基于频域数值积分算法的加速度式波浪传感器设计。详细说明该波浪传感器的硬件设计和软件流程。介绍采用MATLAB-DSP系统级集成环境的DSP软件设计方法。该传感器调试简单,稳定性高,体积小。     

远程心音采集识别系统的研发

为实现心音的采集与远程传输,完成远程心音采集识别系统整体方案设计。采集终端基于LPC2214搭建硬件平台,设计液晶模块OCM240128-7和网络控制芯片RTL8019AS等接口电路,实现心音采集、存储、传输和查询等功能。服务器软件基于Visual studio 2005平台开发,采用Windows Socket实现网络通信,调用SQL Server实现数据的管理。     

乳糖酶制剂活力测定方法的研究

乳糖酶是一种重要的酶制剂,广泛地应用于食品特别是乳品工业。目前国内没有乳糖酶的活性测定方法标准。参照美国食品药品法典第五版(FCCⅤ),对国内外测定条件进行了逐项试验的研究,建立了乳糖酶活力测定的方法。     

某深基坑工程方案设计比选分析

某深基坑工程地下水资源丰富,周边环境非常复杂.针对本工程的现场实际情况,介绍了复杂环境条件下深基坑支护方案设计比选的要点,并结合当地的施工经验来选择支护方案,给类似项目提供了一种方案比选方法,具有一定的实用价值.     

Effects of addition of colloidal silica particles on TEOS-based stone protection using n-octylamine as a catalyst

Protective agents based on tetraethoxysilane (TEOS) have been widely used for the protection of stone heritages. However, TEOS-based protective agents suffer from practical drawbacks, such as crack formation of the gel during the drying phase due to the developed capillary force, which is typical for TEOS-based protective agents. In this paper, we have prepared new TEOS-based protective agent containing flexible hydroxyl-terminated polydimethylsiloxane (PDMS-OH) and colloidal silica particles (167 nm) using n-octylamine as a catalyst in order to reduce capillary force development and increase hydrophobicity, and have characterized them for the application of stone protective agent. The extent of surface hydrophobization depends on concentration of colloidal silica particles and reaches a maximum value of 123° at 0.2% (w/v) of colloidal silica particles for the case of treated with the modified composition. The presence of n-octylamine is a key factor which promotes the increase of the gel pore size. The protective performances were also evaluated by its ability to resist acid corrosion. The results reveal that the protective effects are satisfying.     

A novel injectable chlorhexidine thermosensitive hydrogel for periodontal application: preparation, antibacterial activity and toxicity evaluation

The aim of this paper was to evaluate the application potential of CS–HTCC/GP–0.1%Chx thermosensitive hydrogel which was synthesized using chitosan (CS), quaternized CS, and α,β-glycerophosphate (α,β-GP) loading with 0.1% chlorhexidine (Chx) (w/v) for periodontal treatment. An aqueous solution of CS–HTCC/GP–0.1%Chx was transformed into hydrogel at 6 min when the temperature was increased to 37°C. The scan electron microscopy (SEM) image of the gel was a porous, loose and crosslinked network. In vitro, Chx released over 18 h from the CS–HTCC/GP thermosensitive hydrogel in artificial saliva pH 6.8. Release rate could be controlled through adjustment of α,β-GP or Chx concentration. CS–HTCC/GP–0.1%Chx thermosensitive hydrogel exhibited excellent inhibitory activity against primary periodontal pathogens. CS–HTCC/GP–0.1%Chx thermosensitive hydrogel had no acute toxicity; the maximum tolerated dose in rats was 400 mg/ml. All results indicated that CS–HTCC/GP–0.1%Chx thermosensitive hydrogel is a strong candidate as a local drug delivery system for periodontal treatment.     

A discrete-time retrial queue with negative customers and unreliable server

This paper treats a discrete-time single-server retrial queue with geometrical arrivals of both positive and negative customers in which the server is subject to breakdowns and repairs. Positive customers who find sever busy or down are obliged to leave the service area and join the retrial orbit. They request service again after some random time. If the server is found idle or busy, the arrival of a negative customer will break the server down and simultaneously kill the positive customer under service if any. But the negative customer has no effect on the system if the server is down. The failed server is sent to repair immediately and after repair it is assumed as good as new. We analyze the Markov chain underlying the queueing system and obtain its ergodicity condition. The generating functions of the number of customers in the orbit and in the system are also obtained along with the marginal distributions of the orbit size when the server is idle, busy or down. Finally, some numerical examples show the influence of the parameters on some crucial performance characteristics of the system.     

卷烟工艺过程中水分相关性分析研究

如何通过调整制丝线关键工艺参数来保证烟支物理指标、产品质量稳定性一直是卷烟工艺面临的重点问题。针对两者之间存在着复杂的非线性关系问题,本文改变传统分析方法,采用多种统计分析方法、特征选择、M5P模型树等方法对关键工艺水分与烟支水分影响规律进行探索研究,挖掘出重要的关联规则,该实验结果表明,该分析方法的有效性和可行性,得出的水分分析模型能有效辅助技术人员在工艺标准修订时提供技术支撑。