摘要：Bipolar plates perform as current conductors between cells, provide conduits for reactant gases, facilitate water and thermal management through the cells, and constitute the backbone of a fuel cell stack. Currently, commercial bipolar plates are made of graphite composite because of its relatively low interfacial contact resistance (ICR) and high corrosion resistance. However, graphite composite’s manufacturability, permeability, and durability of shock and vibration are unfavorable in comparison to metals. Therefore, metals have been considered as a replacement material for graphite composite bipolar plates. The main objective of this study is to evaluate the effect of terminal connection design and bipolar plate material on PEM fuel cell overall performance. The study has indicated that single cell performance can be improved by combining terminals into metallic bipolar plates. This terminal design reduces the internal cell resistance and eliminates the need for additional terminal plates. The improved single cell performance by 18% and the increased savings in hydrogen consumption by 15% at the current density of 0.30 A/cm2 was attributed to the robust metal to metal contact between the terminal and the metallic bipolar plates. However, connecting metal terminal directly into graphite bipolar plates did not exhibit similar improvement in the performance of graphite fuel cells because of their brittleness that could have caused damage in the plates and poor contacts.

摘要：为了满足人们对音乐软件日益提高的需求,设计并开发了一套基于MVC模式的在线音乐平台系统。该系统以UML出发进行面向对象分析与设计,采用C/S(Client/Server)架构、MySQL数据库、Live555流媒体服务器、json数据传输等技术,以及C++、QMl编程语言,对系统的功能模块、UI界面和数据管理进行了设计与实现。系统主要包括6个功能模块:在线听歌、下载音乐、发布音乐、音乐笔记、以歌交友、音乐管理。该音乐平台系统是一套功能齐全、操作方便、可适用于不同群体的在线音乐软件。

摘要：随着高血压患者的日益增多,全天候血压监护的需求日渐增长,做到能够快速、及时、方便地进行血压监测成为了当下热门的研究课题。基于脉搏波速法的无创连续血压监测系统提供了一个很好的研究方向,通过便携式的可穿戴设备采集人体生理信号,借由多元线性回归建立一个生理信号的特征参数与血压的模型,可以实现实时无创连续血压监测,打造了一个无创连续血压监测的系统平台。

摘要：介绍以弧压为传感信号的摆动式TIG焊焊缝跟踪技术。硬件设计方面,采用两级滤波的方法,前级主要用来保护控制电路,后级主要用来滤除杂波。软件处理方面,针对搭接TIG焊的特点,采用摆动焊接方法,利用积分比较法,实现了焊缝的自动跟踪;提出加权处理的方法,对积分比较法进行修正,进一步保证了跟踪的实现,提高了跟踪精度。试验证明,该技术控制可靠,焊缝跟踪效果好。