直硝高压釜损坏原因分析及改进设想

介质内氧化性物质的腐蚀性及釜内外压差与外压失稳等是造成直硝高压釜损坏的直接原因 ,提出了相应改进方案     

Femtocell在中小企业的应用

主要探讨Femtocell在3G时代的价值,分析Femtocell在中小企业的应用,以及其在满足中小企业应用所应进一步增强的各种能力建设。     

Microstructure and residual stress distribution of similar and dissimilar electron beam welds – Maraging steel to medium alloy medium carbon steel

The influence of parent metal heat treatment condition on the residual stress distribution in dissimilar metal welds of maraging steel to quenched and tempered medium alloy medium carbon steel has been investigated. It has been observed that the residual stress distribution would be more compressive if the maraging steel is in soft condition. This is attributed to stress absorbing nature of highly yielding soft maraging steel.     

An efficient solution for mitigating light-load penalty in EPONs

In this paper, an effective medium access control protocol is proposed for Ethernet passive optical networks. By combining the bandwidth guarantee polling (BGP) scheme with the strict priority queuing (SPQ) mechanism, the proposed solution can greatly mitigate the light-load penalty while supporting differentiated services. The performance of the proposed solution has been demonstrated by the simulation results.     

主要环境因子对两株松树外生菌根真菌生长的影响

研究了培养基、pH、温度及水势对松林下常见外生菌根真菌牛肝菌(Boletus sp.)和乳菇(Lactariussp.)生长的影响。结果表明,在所选择的培养基上,两种菌株都能生长,在添加维生素类物质的天然培养基上,生长旺盛;对pH适应范围较广;L.sp.在弱碱性条件下生长较好,而B.sp.在弱酸性条件下生长较好;温度对菌株生长影响较大,两种菌株最适生长温度均为25℃;极端水势条件下,L.sp.和B sp.均不能生长,轻度水分胁迫能促进L.sp.和B.sp.的生长。L.sp.是一种适应性较强的菌株。     

PLC在广电中波天线开关自动切换系统中的应用

文章介绍了基于PLC控制的广电中波天线开关自动切换系统的控制原理，系统的整体设计与实际应用结果分析。提供了主要的硬件原理图和软件框图。该系统功能先进、实用，具有良好的应用前景。     

基于485总线的板级通信标准协议

当前,工业控制设备都朝向复杂化、多元化发展,其中以主板卡拖载多块子板卡最为流行。主板卡与子板卡之间的通信协议多种多样,如TCP/IP等,然而这类协议复杂,移植困难,就板级通信来说,属于短距离通信,信道不易受干扰,从而寻求一种简单、可靠的板级通信协议成为一种必要。本文就上述各种需求,研究出一套易于移植、并可扩充的基于485总线的通信标准协议,便于在单片机上实现。     

改进的模拟退火算法在板式家具工业优化下料问题中的应用

讨论了如何利用改进的模拟退火算法即单调升温的模拟退火算法求解板式家具生产中的优化下料问题。在对问题进行数学描述的基础上，给出了算法求解的关键步骤和方法；讨论了单调升温模拟退火算法中如何跳出局部最优解，以及升温幅值的确定方法。实例表明该算法优化速度快，效率高，能有效解决大规模矩形件优化下料问题。     

Flying Probe Tester : Architecture, Principle and Implementation

1 IntroductionThere are mainly three kinds of circuit faults:components' fault, PCB' s (Printed Circuit Board)fault and assemblage fault. Among them, PCB' s faultaccounts for half of all. Generally speaking, PCB' sfault comes into being in the manufacturing process andthe most common forms of the fault include the short ofconductors in different nets and the open of conductorsin the same net. There will be economy loss if we solderthe electron components on a PCB with fault. So, it isve…     

输油气钢管腐蚀渗漏原因分析

某油井钢管使用不到一年即发生渗漏。采用化学分析、力学性能测试、金相及超声波检验和电镜能谱分析等方法，对渗漏钢管进行了分析。结果表明，该钢管实为焊管，不是技术规范所要求的无缝钢管。加上该焊管的焊接质量较差，加速了输送介质对焊管的腐蚀，最终导致焊管短期内发生渗漏。