对建设创新型煤炭企业的几点认识

围绕建设以“六型”为基本特征的卓越煤炭企业谈了几点体会。以乌兰木伦煤矿为例,提出了现代化企业应针对内部各个企业的特点,建立差别化、特色化的管理体制,使不同特色的企业以不同的方式发展。     

艾宾浩斯记忆曲线的防遗助记应用程序

针对用户有复习记忆的需求,本文设计了一款基于艾宾浩斯记忆曲线的“防遗助记”APP,主要包含遗忘复习模块、个人中心推荐模块以及用户登陆注册模块。该APP运用了Android技术、Spring Cloud、服务注册与发现技术以及个性化推荐算法来实现系统的功能,且将艾宾浩斯遗忘曲线融入遗忘复习模块中,可以辅助用户进行强化记忆。     

基于不确定性度量的证据组合方法

针对Dempster组合规则不能有效组合冲突证据,已有的基于证据间距离的改进组合方法计算复杂度较大的情况,提出了一种证据加权平均组合方法。首先以邓勇等人的组合方法为例计算了基于证据间距离的改进组合方法的计算复杂度,分析了造成计算复杂度较大的原因;然后通过引入证据的不确定性度量概念来描述证据的不确定性并以此为基础定义证据的权重;最后给出算法步骤。理论分析和数值算例表明,该方法能有效融合冲突证据,收敛速度快且降低了计算复杂度。     

应急案例本体模型的研究及应用

应急案例是应急指挥决策的重要依据。以网页形式存储的应急案例数据量呈指数趋势上升,但是网页开放性特点决定数据异构性强,导致应急案例信息理解和利用困难。针对上述问题,提出了应急案例本体模型（ECOM）,构建应急案例知识模型,模型包括上层本体和应用层本体。以ABC本体为基础扩展形成eABC作为上层本体,应用层本体则从应急主体、客体、发展过程、救援过程等方面建立应急案例概念、关系、函数、公理和实例的五元组,其中考虑应急案例网页位置信息以评估信息可信度。最后,以汶川地震描述为实例验证了ECOM模型。     

基于ＰＲＯＦＩＢＵＳ—ＤＰ总线的尾浆试验台拖动与计算机监控系统的设计

根据尾浆试验台拖动系统的特点及技术要求,采用S7－300PLC作为中央控制器,PII工控机作为监控计算机,SIMOVERTMD工程型变频器作为DP从站,构成一个基于PROFIBUS－DP现场总线控制网络。     

特征选择算法在故障检测中的应用研究

将基于决策树的特征选择方法应用于卫星故障检测中,在卫星故障检测应用研究中,综合分析了问题的特征,指出了基于决策树的特征选择方法,并且给出了在该方法下,特征选择算法的正确率和在卫星故障检测中的应用效果。     

圆高强钢管UHPC梁抗弯性能研究

高强钢管高强混凝土的应用越来越广泛,但目前对于其徐变特性的试验研究较少。该文对15根不同含钢率的高强钢管高强混凝土轴压短柱进行了365 d的收缩和徐变测试,并将试验结果与常用的徐变预测模型MC90、ACI209和MC2010等进行了对比。试验结果表明：高强钢管高强混凝土的徐变系数远小于素混凝土,当加载365 d后,素混凝土的徐变系数是高强钢管高强混凝土的2倍以上;含钢率对钢管混凝土试件的徐变有一定影响,徐变系数随着含钢率的增大而减小。在对比的3种常用徐变预测模型中,MC2010模型的徐变预测结果与试验结果吻合最好,可推荐用于高强钢管高强混凝土的收缩和徐变效应计算。此外,还将高强钢管高强混凝土与普通钢管混凝土的徐变试验结果进行了对比,结果表明,钢管混凝土的徐变随着核心混凝抗压强度的增加而减小。研究成果可为高强钢管高强混凝土轴心受压构件在正常使用阶段的徐变预测及徐变变形控制提供依据。     

Gyres off the Somali coast and western boundary currents in the Bay of Bengal during the south-west monsoon

Satellite remotely-sensed sea surface temperature (SST) data were obtained during the initial phase of the onset of the south-west monsoon in the north-western Indian Ocean for the years 1987and 1988. Large wedge-like areas of upwelled water during 1988 were observed at 5°Nand 10°N after the Somali current spinup, indicative of a two-gyre circulation in the Somali current system. Satellite infrared observations of the Bay of Bengal during the early February 1990revealed the existenceof two bands of warm water that resembled a western boundary current (WBC) along the east coast of India. A warm core eddy, with a major axis of nearly 120km, appeared at 89°E and 19°N at the end of the axis of the current. The existence of the two gyre system ofT the Somali coast and the presence or absence of the WBC in the Bay of Bengal in response to the onset of the summer monsoon has been discussed in detail.     

Frequency dependence of polarization phase difference

Polarimetric AIRSAR data of 13 July 1990 acquired over Mahantango watershed area were processed for the identification of cornfields and forested areas. Polarization Phase Difference (PPD) values were computed for the cornfields at P-, L- and C- bands and studied as a function of frequency. The results compare well with the model calculations at 24° incidence angle, whereas the locations of cornfields were computed to be at 35° incidence angle. The discrepancy is attributed to a lack of accurate ground truth and the undulating topography of the cornfields. Another study reported here deals with the usefulness of the Polarization Index (PI) for the study of vegetation. PI was found to be dependent on the frequency for the cornfields, whereas for forest trees no such dependence was noticed. PI _HH,HV is a more useful parameter than PI _HH,HV even for the study of cornfields.     

Stability of a class of coupled non-linear time-varying systemsf†

The paper describes a two-stage method for the design of proportional-derivative output feedback for pole placement in multivariable systems. In the first stage, a number of poles are assigned by means of proportional output feedback. In the second stage, the assigned poles are preserved and a number of additional poles are positioned using proportional-derivative output feedback. The method is extended to the design of proportional-multiple-derivative output feedback and is illustrated by a numerical example.