Research on prediction for coal and gas outburst based on Matlab neural network toolbox and its application

In order to predict the danger of coal and gas outburst in mine coal layer correctly, on the basis of the VLBP and LMBP algorithm in Matlab neural network toolbox, one kind of modified BP neural network was put forth to speed up the network convergence speed in this paper. Firstly, according to the characteristics of coal and gas outburst, five key influencing factors such as excavation depth, pressure of gas, and geologic destroy degree were selected as the judging indexes of coal and gas outburst. Secondly, the prediction model for coal and gas outburst was built. Finally, it was verified by practical examples. Practical application demonstrates that, on the one hand, the modified BP prediction model based on the Matlab neural network toolbox can overcome the disadvantages of constringency and, on the other hand, it has fast convergence speed and good prediction accuracy. The analysis and computing results show that the computing speed by LMBP algorithm is faster than by VLBP algorithm but needs more memory. And the resuits show that the prediction results are identical with actual results and this model is a very efficient prediction method for mine coal and gas outburst, and has an important practical meaning for the mine production safety. So we conclude that it can be used to predict coal and gas outburst precisely in actual engineering.     

浅析集团企业财务共享服务中心的构建与实践

如今社会正向着全球一体化发展,近些年世界上大型集团公司都将创建财务共享服务中心作为自身改革及谋求发展的重点。建立财务共享服务中心,能够帮助集团公司节省经营成本、强化实际工作水平,使企业的核心竞争力得到加强和提高。本文放眼未来并兼顾现在企业的发展需求,阐述了共享型财务中心的组建要求,详细分析了构建集团公司共享型财务服务中心所涉及到的相关问题并提供相应的对策以供借鉴。     

论述工业循环水中生物粘泥的控制

生物粘泥的滋生，是循环水系统中的难题。生物粘泥恶化水质、腐蚀设备。控制粘泥的方法有化学法、物理法和生物法，三种方法各有利弊。循环水系统应根据实际，从效果、效益和环保三方面综合考虑，采用综合优化的方法实现生物粘泥的有效控制，保证生产运行。     

灰色系统理论在矿井瓦斯涌出量预测中的应用

以预测矿井瓦斯相对涌出量为研究目的，通过灰色系统的建模、关联度分析及残差辨识为基础，建立了灰色系统理论模型，并将该模型应用到某矿瓦斯涌出量预测分析中，对该矿历年来相对瓦斯涌出量进行了灰色生成，建立了灰色预测系统；由后验差检验结果、对照精度检验等级可知，灰色系统预测矿井瓦斯涌出量的拟合精度好，预测结果正确可靠，反映出了矿井瓦斯涌出量的客观存在与发展态势.     

园林废弃物堆肥产品对蝴蝶花生长发育的影响

采用不同混合比例的园林废弃物堆肥产品和园土作为盆栽基质,研究其对蝴蝶花生长的影响。结果表明:添加堆肥产品可以明显促进蝴蝶花的生长。与无添加处理(CK)相比,各混合比例在发芽时间、株高、开花情况及其花径和植株重量方面均有显著影响,发芽时间最长提前了3d,株高增幅达到98.1%,花朵数最多增加62.5%,花径大3.2倍,植株重量可达CK的12倍。因此,推荐使用比例为园林废弃物堆肥产品与园土体积比为40%,栽培蝴蝶花效益更佳。