岩爆的发生机理及防治措施

岩爆是隧道主要地质灾害之一,给施工带来不利的影响,秦岭终南山经理部在岩爆防治上作了大量的探索和尝试,并取得了明显的效果,希望能为以后的工程提供一些有益的参考。     

紧邻既有建(构)物等复杂条件高路堑石方爆破技术研究

秘鲁瓦努科至瓦杨柯公路改扩建项目工期紧张,其中一地段为大方量的高路堑石方爆破开挖,但该段路堑紧邻当地民房及既有通行繁忙的道路,施工环境复杂,爆破开挖石方时,确保民众的生命财产安全的压力非常大.本项目周密编制爆破工艺及采取科学合理的安全防护措施,在确保安全的前提下,按既定工期目标完成施工.     

地下综合管廊混凝土爆灰检测及加固

针对某市钢筋混凝土地下综合管廊的现浇顶板、侧壁出现的混凝土爆灰质量缺陷,为确保管廊结构的安全使用,采用钻心法、超声波法、沸煮试验、爆灰物质的化学成分分析等检测方法,对爆灰现象进行了检测。结果显示,混凝土中存在的块状氧化钙与水熟化后体积增大1倍~2.5倍,使得混凝土在强度未达到设计抗拉强度前在块状氧化钙体积膨胀应力作用下被拉裂,导致了此类质量缺陷的发生。分析了质量缺陷对管廊结构的影响,并对管廊结构进行了加固设计及处理,满足了结构的正常安全使用要求。研究结果可为类似爆灰缺陷的设计及处理提供参考。     

干熄焦锅炉爆管的原因及预防措施

结合梅山钢铁公司能源公司1^#于熄焦锅炉的运行情况及国内于熄焦锅炉爆管的原因进行技术分析，得出爆管的主要原因，并制定预防措施，确保CDQ锅炉的安全稳定运行。     

浅谈爆炸硬化辙叉在朔黄线的应用

随着西煤东运第二条大通道朔黄铁路运量的增加,运输压力越来越大。自90年代以来,铁路运输飞速发展,提速、重载给工务线路带来了一系列问题,尤其是辙叉已远远不能满足铁路提速重载的要求。2011年开始朔黄铁路在黎明居车站3号、4号岔位和神池南车站2083#、2043#岔位陆续试用了60-12#和75-12#爆炸硬化辙叉。实践表明,爆炸硬化辙叉提高了道岔使用寿命,增大了安全系数,创造更多的经济效益和社会价值。     

Moment explosions in stochastic volatility models

In this paper, we demonstrate that many stochastic volatility models have the undesirable property that moments of order higher than 1 can become infinite in finite time. As arbitrage-free price computation for a number of important fixed income products involves forming expectations of functions with super-linear growth, such lack of moment stability is of significant practical importance. For instance, we demonstrate that reasonably parametrized models can produce infinite prices for Eurodollar futures and for swaps with floating legs paying either Libor-in-arrears or a constant maturity swap rate. We systematically examine the moment explosion property across a spectrum of stochastic volatility models. We show that lognormal and displaced-diffusion type models are easily prone to moment explosions, whereas CEV-type models (including the so-called SABR model) are not. Related properties such as the failure of the martingale property are also considered.

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浅析粮食立筒仓粉尘爆炸及防爆措施

通过对立筒库粮食生产过程产生粉尘飞扬，易引发粉尘爆炸的研究，从发生粉尘爆炸的条件、机理、特点、危害人手，深入分析粮食立筒库内产生粉尘的原因及发生粮食粉尘爆炸的原因，提出预防粮食粉尘爆炸的具体措施。     

关于某水箱维修店氧气瓶爆炸事故之原因分析

提出可能引起氧气瓶爆炸的各种原因,根据调查结果,利用推理论证法和排除法对各种原因进行分析,并从金属失效形式的本质即断裂特征进行分析论证,得出具体的爆炸原因和爆炸性质。     

Fujian FTZ to Highlight Cross-Straits Cooperation

【正】Fujian,as known to all,will play the card of cooperating with Taiwan in its FTZ blueprint.The proximity to each other and deep-rooted cultural similarities h...     

Assembly FG: An Educational Case on MRP II Integrated within ERP

This case teaches students how discrete (job order) manufacturing companies use Manufacturing Resource Planning (MRP II) within Enterprise Resource Planning (ERP) systems to plan purchase orders for direct materials and shop orders for work‐in‐process and finished goods. Students simulate MRP II integrated within ERP, using Microsoft Excel to learn MRP II's bill‐of‐materials (BOM) Explosion that plans order quantities and MRP II's scheduling logic that uses lead‐times to determine start dates for planned orders. Students explain why MRP II is most practical and effective when executed within ERP and how MRP II can reduce excess inventories, prevent inventory shortages, and help companies deliver quality products to customers on schedule. Also, students explain why BOM, inventory, and lead‐time inaccuracies can adversely affect the accuracy of MRP II‐planned replenishments and identify controls that reduce the risks of these inaccuracies.