进气流量对防爆柴油机动力及排放性能的影响

为了改善井下工人工作环境,减少井下柴油机NOx,CO,HC等污染物的排放,根据防爆柴油机的工作环境及排放法规要求,针对某型防爆柴油机不同进气流量下的动力性和排放性进行了试验研究,确定了适当的防爆柴油机进气流量。试验结果表明,减小进气流量使防爆柴油机动力性有一定降低,也使得排放中的烟度略有增加,但却一定程度上降低了NOx的排放。     

煤矿用防爆柴油机冷却风扇液压驱动系统研究

防爆柴油机是煤炭开采设备使用的主要动力源。当前防爆柴油机冷却系统风扇主要采用传统曲轴定转动比驱动,无法完全适应煤矿井下复杂的工作条件,造成风扇功耗大,冷却效果差,空间布置受限等问题。本文研究了防爆柴油机冷却系统结构,提出了采用液压驱动方式,分别对冷却系统中的不同组成进行独立控制的解决方案,从而改善了系统过热、过冷情况。将风扇与防爆柴油机分开布置,使得系统设计更加灵活,可以适应更多的应用场合。     

煤矿井下液力传动柴油机车动力系统匹配设计

通过柴油机与变矩器的匹配计算，机械传动比的确定和副变速装置的设计，介绍煤矿井下液力传动柴油机车动力系统的匹配方法。     

MWMD916柴油机及其使用可靠性分析

介绍了ＭＷＭＤ９１６系列柴油机的性能参数及其在国内的应用情况,着重分析了该系统柴油机在我国煤矿井下辅助运输设备使用中存在的问题及产生原因,结合实际使用和维修经验提出提高柴油机使用可靠性的必要性及措施。     

煤矿井下柴油机车污染及防治措施

本文分析了煤矿井下柴油机车污染的影响因素,并提出了供风量计算方法、污染的防治措施及有关建议。     

井下防爆轨道机车的特点和发展

系统分析了辅助运输系统中轨道机车的特点。重点介绍了几种新型防爆柴油机牵引机车和防爆蓄电池牵引机车的特点和使用情况，并就发展我国的井下轨道辅助运输系统提出了意见和看法。     

双摆道岔及其计算研究

针对柴油机卡轨车具有的卡轨及拖轨制动双重功能，并考虑煤矿井下的特殊工况，提出一种比一般专用道岔结构更简单、使用更方便的新型专用道岔——双摆道岔，并给出了这种道岔的计算方法。     

冷却净化水箱对防爆柴油机的影响研究

对加装冷却净化水箱前后的井下防爆柴油机进行了十一工况和外特性试验,分别测得不同工况下防爆柴油机排气口温度、排放废气及颗粒物含量、输出转矩、输出功率及油耗率,进而得到冷却净化水箱对防爆柴油机排放特性、动力性及经济性的影响。结果表明:防爆柴油机加装冷却净化水箱后,排气降温效果明显,废气温度不高于50°C;NOx排放有很大的改善,最大排放降幅为39.3%;CO排放量在高负荷工况下有所增加,最大增幅为22.2%;HC排放量变化不大;颗粒物排放量在高负荷工况下稍有增加;动力性有所降低,在最大转矩处,输出转矩和输出功率均下降2.5%;经济性有所下降,油耗率最多增加了3.2%。     

WC5矮型防爆柴油机无轨胶轮车的设计

为了适应神东集团薄煤层低矮巷道的运输要求,提出了一种WC5矮型防爆柴油机无轨胶轮车的设计方案。该矮型胶轮车采用成熟的WC5防爆柴油机无轨胶轮车设计技术,结合薄煤层巷道行驶的特点,对前机架局部超过规定高度的部分进行了改动,重新设计了后客厢,并增加了安全性方面的设计。实践证明,该矮型胶轮车的使用减轻了井下作业工人的劳动强度,提高了工作效率、安全性和舒适性。     

应用手持无线移动终端实现对煤矿井下的断电控制

文章介绍了目前煤矿井下断电控制的现状,阐述了通过手持无线移动终端实现对井下交互断电控制的网络技术架构和断电控制工作原理,给出了手持无线移动终端交互控制系统的主要测试界面实例和主要测试性能,并讨论了需要紧急下达无线断电指令的几种灾害范围。应用手持无线移动终端实现对煤矿井下的断电控制,可突破时空限制,及时动态地掌握煤矿井下灾害异变及灾害涉及的范围,及时下达和执行井下的无线断电控制指令,从而切断井下供电电源,有效防止井下事故发生和灾害的扩大。     

Assessing Ideational and Evaluative Skills and Creative Styles and Attitudes

This article describes the rationale for the multiphase creative problem solving process, and reports the findings from an empirical investigation conducted to facilitate the problem solving of managers. The ideational skills of the managers were assessed before and after training in a complete process of creative problem solving, along with their ideational attitudes, creative problem solving style (i.e., generator, conceptualizer, optimizer, or implementor), and evaluative skill (i.e., ability to recognize original ideas). The most important findings indicated that the training had a significant impact on the evaluative accuracy of the managers. They were significantly more accurate in their judgments about original ideas after training, both in their identification of original ideas and their recognition of unoriginal ideas. After training, the managers also gave more solutions and more original solutions to problems. Finally, several variables (e.g., the “preference for active divergence” attitude, and the conceptualizer process style) seemed to moderate the impact of training. Training was therefore effective, with specific effects that can be predicted from pre-training individual differences in attitudes and process style.     

Rank and select revisited and extended

The deep connection between the Burrows–Wheeler transform (BWT) and the so-called rank and select data structures for symbol sequences is the basis of most successful approaches to compressed text indexing. Rank of a symbol at a given position equals the number of times the symbol appears in the corresponding prefix of the sequence. Select is the inverse, retrieving the positions of the symbol occurrences. It has been shown that improvements to rank/select algorithms, in combination with the BWT, turn into improved compressed text indexes.     

高等院校行政分析与决策系统的设计与实现

为提高高等院校的管理水平和决策水平,充分利用校园网资 源,开发了高等院校行政财政分析与决策系统。解决了诸如数据的动态查询、自动生成报表 、网络环境下数据共享等技术问题,具有网上数据共享、图形界面友好和安全的保密措施等 特点。     

Stochastic balancing and approximation-stability and minimality

A new method of stochastic model reduction has recently been introduced by Desai et al. [1], [2]. The stability of the reduced order model has not previously, been considered. In this paper, we show that the stability of the reduced order model follows directly from the results of Pernebo and Silverman [3]. It is also shown that the reduced order model is minimal, in the controllability/observability sense. The relevance of this notion of minimality to stochastic minimality is made clear.