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正0引言石油化工企业凭借其在国家能源行业中的特殊地位,长期以来对中国经济有着举足轻重的影响,但是由于石化生产工艺技术复杂,运行条件苛刻,易出现突发灾难性事故,一旦发生火灾,火情复杂,常伴随轰燃、爆炸、毒气、腐蚀和污染,灭火难度大,因此消防装备配备是否合适将直接影响到国家和人民的生命财产安全。本文主要通过消防车的状况来介绍石油化工行业装备的发展现状,有助于提高处理火灾的能力与效率。 相似文献
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为研究隧道开挖工法对高陡边坡下隧道洞口区稳定性的影响,文章依托某实际隧道工程,采用FLAC3D软件建立了相应的三维模型,对三台阶法、环形预留核心土法和CRD法开挖施工进行模拟分析,并与现场监测结果进行对比,得到如下结论:(1)对比三种工法开挖时隧道围岩和边坡变形可知,CRD法为最适宜,采用该工法开挖隧道时,洞口区围岩和边坡变形最小;(2)数值模拟所得围岩及边坡变形变化规律与现场监测结果基本一致,故采用数值法进行隧道施工优化具有一定的可行性;(3)为减少隧道开挖对洞口区边坡的影响,采用CRD法进行隧道开挖,结合锚索预加固可有效提高边坡稳定性。 相似文献
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This study presents a time series prediction model with output self feedback which is implemented based on online sequential extreme learning machine. The output variables derived from multilayer perception can feedback to the network input layer to create a temporal relation between the current node inputs and the lagged node outputs while overcoming the limitation of memory which is a vital part for any time-series prediction application. The model can overcome the static prediction problem with most time series prediction models and can effectively cope with the dynamic properties of time series data. A linear and a nonlinear forecasting algorithms based on online extreme learning machine are proposed to implement the output feedback forecasting model. They are both recursive estimator and have two distinct phases: Predict and Update. The proposed model was tested against different kinds of time series data and the results indicate that the model outperforms the original static model without feedback. 相似文献