矿井通风系统的优化改造

矿井开采深度增加,采区通风线路长,各采区通风阻力差别较大,造成矿井通风系统较为复杂.采取矿井与采区相结合进行通风系统改造,达到降低全矿井通风阻力和完善矿井通风系统的目的.     

配备辅助通风的高温矿井采掘区温度分布数值模拟

巷道高温是制约深部开采的一个重要因素。为了更好地发挥辅助通风设施的作用,提高短距离高温矿井的通风降温效果,采用数值模拟方法研究辅助通风设施对巷道降温效果。通过建立数值模型,设置有无辅助通风设施、不同辅助通风设施长度、不同辅助通风设施与墙壁之间的距离以及不同进气道风速等条件,分析掘进巷道的冷却情况。结果表明:无辅助通风设施的巷道仅靠增加进气道风速无法获得显著的冷却效果;在增加辅助通风设施的情况下,随着辅助通风设施长度的增加,掘进巷道的冷却效果越来越好,当辅助通风设施长度增加到一定程度后通风降温效果开始下降;增加辅助通风设施与墙壁之间的距离可显著提高通风降温效果;在辅助通风设施长度和辅助通风设施与墙壁之间距离固定的前提下,增加进气道风速可改善冷却效果,但随着风速增加,冷却效果改善越来越不明显。     

Ventsim通风软件在某矿山通风中的应用

井下通风系统作为矿山井下八大系统之一,一直是矿山井下安全生产的重中之重。在通风模拟软件之前,矿山井下通风通过手工计算完成,手工计算缺乏对通风系统动态的计算过程。Ventsim通风软件能够比较真实的模拟矿井通风的情况,对矿井通风的动态管理、通风构筑物的布置及主扇风机的选择具有重要的意义。     

按需通风技术在某矿山工程设计中的应用北大核心

按需通风(VOD)技术从井下风量"供需平衡"出发,在矿山通风系统设计和控制中,采用最小的通风成本,最大限度地改善井下工作环境。本文以某铜矿山为工程背景,从通风计划、通风设备、人员定位、风流监测和按需通风控制管理系统等方面对整个矿山的按需通风系统进行介绍,并运用三维通风仿真软件Ventsim Visual^(TM)对全矿区域通风方案进行模拟比较,分析其节能效果。与传统通风方案相比,按需通风技术对于改善井下作业环境、降低风机能耗和通风及预热成本效果显著,具有很好的推广性。     

某矿井通风阻力测定分析

为合理地完善矿井通风系统,实现矿井安全清洁生产,运用气压计基点测定法对某矿井进行了通风阻力测定,得到该矿井通风阻力分布状况。通过对该矿井通风阻力测定、矿井通风阻力系统误差计算及分析,得出了该矿矿井通风系统相关参数的具体数值,为今后经济合理地完善矿井通风系统提供依据。     

某金矿局部通风系统问题分析及优化方案研究

某金矿由于开采深度不断增加,通风系统更加复杂,通风管理问题逐步突出,急需对通风系统进行问题梳理和整改优化。通过对该金矿通风系统进行现场测定,获取通风系统关键参数,结合利用Ventsim建立的三维通风模型,发现通风系统存在的关键问题。借助Ventsim对循环风问题、中段回风井断面不足问题、通风构筑物设置不合理问题进行治理方案模拟验证分析,分析显示各项优化方案能够满足深部通风需求。     

抱伦金矿通风系统优化研究

为了改善井下环境、确保矿井生产安全,通风系统必须保持最佳运行状态。以抱伦金矿矿井通风系统为研究对象,通过对通风系统进行调查与测定,得出该矿通风系统存在矿井总风量不足、采区通风困难、机站风机效率低及采空区漏风严重等问题,井下通风系统运行受到干扰,严重影响了井下安全生产。利用计算机模拟解算优化分析,对该矿通风系统进行优化改造,提出了通风系统优化研究方案。现场实施结果表明：优化后的矿井通风系统通风效果明显改善,矿井总风量明显增加,机站效率为83.1%,风速合格率为87.5%,有效风量率为73.7%,采掘面平均温度为26.3 ℃。该优化方案改善了井下通风条件,解决了抱伦金矿现有通风系统存在的问题。     

江西金山金矿湾家坞矿区井下通风系统优化模拟研究

针对江西金山金矿湾家坞矿区存在的通风系统漏风严重,主扇运转困难等问题,提出了用风段分区通风系统优化技术方案,通过Ventsim三维通风数值模拟软件建立井下通风三维模型,并进行了通风模拟与通风网络解算。模拟解算结果表明:用风段分区通风系统通风效果良好,可以较好地改善井下空气质量,能够避免能见度低带来的安全隐患,改善井下作业人员的工作环境,可为江西金山金矿通风系统改造提供理论依据。     

金属矿山井下开采局部通风类型及使用场所分析

金属矿山井下局部通风的研究较为少见,煤矿和非金属矿山井下局部通风的研究较多,已经衍生了多个有益的研究成果,其研究成果在金属矿山也得到广泛采用。金属矿山井下局部通风任务、方式各有不同,所采用的局部通风方法也存在差异。针对矿山井下开采不同局部通风类型的通风任务、通风机理、局部通风设备选用上的区别,论述不同局部通风方法的区别及适合的使用场所。     

白姑矿通风阻力测定及分析

矿井通风系统主要是由通风网络、通风动力及通风构筑物三部分组成的大型复杂关联系统,对其通风网络进行通风阻力测定是通风技术管理工作的重要内容之一。依据白姑矿通风系统为东西两翼对角式通风实际,选择东西两翼两条主测路线进行全矿通风阻力测定及两条辅测路线来验证局部主要测定路线数据的准确性,并根据不同测定方法对该矿实用性比较,采用基点法进行测定。根据测定数据运用风网进行解算,系统掌握了矿井通风系统现状及相关通风技术参数,为该矿实现科学的通风系统及网络结构,保证矿井通风合理、稳定提供了可靠的基础资料。     

局域网中ARP欺骗攻击及安全防范策略

随着计算机网络技术的飞速发展,互联网的应用变得越来越广泛,网络信息的安全性变得日益重要起来,已被社会的各个领域所重视.本文对目前计算机网络存在的安全隐患进行了分析,并探讨了针对计算机安全隐患的防范策略.     

Intelligence and substance use.

Why do some individuals choose to drink alcohol, smoke cigarettes, and use illegal drugs while others do not? The origin of individual preferences and values is one of the remaining theoretical questions in social and behavioral sciences. The Savanna-IQ Interaction Hypothesis suggests that more intelligent individuals may be more likely to acquire and espouse evolutionarily novel values than less intelligent individuals. Consumption of alcohol, tobacco, and drugs is evolutionarily novel, so the Savanna-IQ Interaction Hypothesis would predict that more intelligent individuals are more likely to consume these substances. Analyses of two large, nationally representative, and prospectively longitudinal data from the United Kingdom and the United States partly support the prediction. More intelligent children, both in the United Kingdom and the United States, are more likely to grow up to consume more alcohol. More intelligent American children are more likely to grow up to consume more tobacco, while more intelligent British children are more likely to grow up to consume more illegal drugs. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

我国钨业“四矿”问题及其对策思考

简要回顾了我国钨矿业悠久的历史、资源的优势、技术的进步和卓越的贡献 ;20世纪80年代中期以后 ,逐步陷入困境 ,举步维艰的主要表现 ;以及在解决“四矿”(矿业、矿山、矿工、矿城)问题中的艰苦经历。指出应在“四矿”问题讨论中做更多、更深的对策思考 ,并对钨业的“四矿”问题加以重点研究。     

What will he think? Men's impressions of women who initiate dates and achieve academically.

Investigated men's attitudes toward women who initiate dates vs those who do not initiate dates by crossing the dating-initiation variable with the level of intelligence a woman displayed (high vs low) in a 2?×?2 between-Ss design. After watching 1 of 4 videotapes of a man and woman conversing in which these 2 variables were crossed, 309 male undergraduates rated the videotaped woman on 53 bipolar adjectives. A factor analysis of these ratings was used to create 12 subscales. The intelligent woman, compared with the unintelligent woman, was rated as more intelligent, more likable, less sexually active, more truthful, more interesting, more flexible, more tactful, less of a casual dater, more religious, and more of a feminist. The woman who asked for a date, compared with the woman who did not, was rated as more sexually active, more of a casual dater, and more flexible and agreeable. Interactions occurred in that the intelligent woman who asked for a date was rated as most likable and more of a feminist. (29 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Some personality and behavioral factors related to birth order.

A study was conducted using 165 firemen in large and small firehouses to test the hypothesis that 1st borns learn to interact more successfully because of their stronger dependency and affiliation needs. It was also predicted that this greater interactional skill would become more apparent the more complex the social situation. As predicted, 1st borns had less selfconfidence. They also conformed more, were more efficient problem solvers in a group situation, and were more often the official leader of their work group. However, these group behaviors were only related to birth order in the larger and more complex groups. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

计算机网络信息安全及其防护策略的研究

随着计算机网络技术的飞速发展,互联网的应用变得越来越广泛,网络信息的安全性变得日益重要,已被社会的各个领域所重视。本文对目前计算机网络存在的安全隐患进行了分析,并探讨了针对计算机安全隐患的防范策略。     

Birth order in cross-cultural perspective.

In a worldwide sample of 39 societies, the birth of a 1st child of either sex was more likely than the birth of other children to increase parent status, stabilize parent marriage, and provide a parental teknonym. Firstborns were likely to receive more elaborate birth ceremonies and, in childhood, to have more authority over siblings and to receive more respect from them. In adulthood, firstborn daughters were likely to receive more respect from siblings than other daughters, and firstborn sons, in comparison to other sons, were more likely to head a kin group and to have more authority over siblings, more control of property, more power or influence over others, and more respect from siblings. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Complex niches favour rational species

On the whole living things evolve from simpler to more complex forms, though not undirectionally. The evolution of more complex species makes the environment more complex and also makes the evolution of even more complex species possible and more selectable. With the evolution of sentients, species can be classified according to their degree of rationality. A more rational species is one whose behaviour (i.e. of its individual members) is controlled (relatively) more by the reward-penalty system than by the automatic, inflexible, programmed responses. In two reasonable simple models, it is shown that a more complex environment favours the evolution of more rational species. This result partly explains the dramatic speed of evolution based mainly on random mutation and natural selection, a speed doubted by creationists.     

Approach and avoidance coping responses among older problem and nonproblem drinkers.

The Coping Responses Inventory (CRI) was used to study coping among older problem and nonproblem drinkers. The CRI organizes coping efforts according to their focus (approach or avoidance) and method (cognitive or behavioral). Compared with nonproblem drinkers, older problem drinkers were more likely to use cognitive and behavioral avoidance responses to manage life stressors. Problem drinkers who experienced more negative life events and more severe stressors used both more approach and more avoidance coping. Those who had more financial and social resources relied more on approach and less on avoidance coping. Problem drinkers who relied more on avoidance coping tended to have more drinking problems and to report more depression and physical symptoms and less self-confidence. Positive reappraisal was associated with less depression and more self-confidence. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

钢结构厂房工程施工质量的控制

在厂房建设中，钢结构厂房的优越性越来越被人们所认同，质量问题引起了人们的高度重视。做好工程开工前的准备，加强施工中的质量管理，对其中重点部位、易出问题部位予以严格控制，是钢结构厂房施工质量控制的关键。