一种新结构的DM-multipath与动态负载平衡

对于存储设备,Linux 在多路径 I/O方面主要有两种类型的解决方案：位于I/O调度器之上的顶层方案(BIO映射器)和位于底层的子系统具体方案(如IDE,SCSI)。因为实施它们的所在存储堆栈中的位置不同,每种方案各有优势。通过与第一种方案比较,介绍具体硬件子系统之上的另一种解决方案,新结构中重点实现移动内核当前多路径层——多路径设备映射器 (dm-multipath)到I/O调度层之下,这种方案能够有效地支持动态的负载平衡。     

Compact,ultra-low vibration,closed-cycle helium recycler for uninterrupted operation of MEG with SQUID magnetometers

A closed-cycle helium recycler was developed for continuous uninterrupted operation for magnetometer-based whole-head magnetoencephalography (MEG) systems. The recycler consists of a two stage 4 K pulse-tube cryocooler and is mounted on the roof of a magnetically shielded room (MSR). A flexible liquid helium (LHe) return line on the recycler is inserted into the fill port of the MEG system in the MSR through a slotted opening in the ceiling. The helium vapor is captured through a line that returns the gas to the top of the recycler assembly. A high-purity helium gas cylinder connected to the recycler assembly supplies the gas, which, after it is liquefied, increases the level of LHe in the MEG system during the start-up phase. No storage tank for evaporated helium gas nor a helium gas purifier is used. The recycler is capable of liquefying helium with a rate of ∼17 L/d after precooling the MEG system. It has provided a fully maintenance-free operation under computer control for 7 months without refill of helium. Although the recycler is used for single-orientation operation at this initial testing site, it is designed to operate at ±20° orientations, allowing the MEG system to be tilted for supine and reclining positions. Vibration of the recycler is dampened to an ultra-low level by using several vibration isolation methods, which enables uninterrupted operation during MEG measurements. Recyclers similar to this system may be quite useful even for MEG systems with 100% magnetometers.     

语音电子秤之语音发生装置的设计

本文叙述了语音电子计价秤中语音发生装置的硬件及软件设计 .     

金鸡滩水电厂2号机组异常运行分析及处理

金鸡滩2号机组在运行中出现了油压装置压油泵频繁打油,受油器下游侧端盖与挡油环、端盖与小轴相互碰刮的异常运行情况,文章对此异常情况进行了分析并介绍了故障的排查处理过程,对类似机组的相同故障处理有借鉴作用。     

变电站电气总平面布置设计思路探讨

电气总平面布置应从配电装置入手，全面了解各级电压各型配电装置的布置特点，设计时应结合电气主接线，并考虑变电站站址及自然地质地形条件，线路走廊等诸多因素，经过对各级配电装置合理组合并通过技术经济比较后，确定最佳的方案。     

大气监测仪器的发展及检定中的问题探讨

本文叙述了大气监测仪器的起源发展过程,分析在检定工作中存在的问题,讨论了解决办法。     

福建省吊钟岩拱桥检查装置方案设计

吊钟岩拱桥的特点是跨度大、拱高大、拱肋曲线形状为三维空间.本文介绍了吊钟岩拱桥检查装置的设计概况,包括方案比较、总体布置、结构设计等.     

韶冶硫酸系统干吸工序的改造与实践

介绍韶冶Ⅰ硫酸干吸工序技术改造和改造后运行情况．改造后提高了设备生产能力，降低了塔体阻力，改善了有关工艺指标控制，并进一步改善环保排放和节能降耗．     

一种新型实用的转炉炉体与托圈的连接装置

转炉炉体与托圈的连接装置是转炉体系统的关键设备之一,它的结构是否合理直接影响托圈和炉壳的寿命及钢产量.文章系统介绍了一种新型实用的转炉炉体与托圈的连接装置的结构及特点.     

基于USB接口技术的多道核谱分析仪的设计

介绍了一种较新的采用USB接口技术的多道核谱获取系统，阐述了P89C51RD2单片机与A／D转换器和USB控制器之间接口应用的软件与硬件技术要点。