无先验地图条件下电力管廊无人机自主巡检方法研究

针对无先验地图条件下电力管廊无人机自主巡检能力不足的问题,本文提出了一种不依赖先验地图的无人机巡检方法。首先,无人机搭载激光雷达,通过SLAM（Simultaneous Localization and Mapping）算法进行实时场景构图,并基于RRT（Rapidly-exploring Random Tree）算法对构建的全局栅格地图进行边界搜索;其次,针对传统RRT算法难以判断环境地图完整性、保障巡检全面性的问题,提出了一种基于数字图像处理的边界检测方法。通过Canny算子对实时构建的地图进行边缘检测,并对地图进行完整性评估。最后,为验证本文提出方法的有效性,在江苏无锡处某220kV电力管廊的仿真模型中进行验证,分别采用RRT算法和本文改进算法进行自主巡检测试,结果表明本文提出的算法相比RRT算法可提升21.8%的巡检覆盖率。     

基于最大偏差相似性准则的BP神经网络短期电力负荷预测算法

针对企业电力负荷随机性强、稳定性低、预测精度不理想等问题,提出了一种基于最大偏差相似性准则的BP神经网络短期电力负荷预测算法。首先对最大偏差相似性准则算法进行修改,并提出使用预测日的负荷特征向量与最大偏差相似性准则算法聚类之后的类中心负荷特征的距离来确定预测日的相似日类别;然后将聚类后的相似日类别负荷数据作为BP网络的训练数据,输出预测日起始的连续三天96整点负荷值。实验表明,该方法提出的短期电力负荷预测方法在精度和网络训练时间上都有较大的提升,具有较高的有效性和实用性。     

Modelling the dynamics of the students’ academic performance in the German region of the North Rhine-Westphalia: an epidemiological approach with uncertainty

Student academic underachievement is a concern of paramount importance in Europe, where around 15% of the students in the last high school courses do not achieve the minimum knowledge academic requirement. In this paper, we propose a model based on a system of differential equations to study the dynamics of the students’ academic performance in the German region of the North Rhine-Westphalia. This approach is supported by the idea that both good and bad study habits, are a mixture of personal decisions and influence of classmates. This model allows us to forecast the student academic performance by means of confidence intervals over the next few years.     

茂金属催化剂及其聚合物的进展

茂金属催化剂是近年出现的新型催化剂，技术进步很快。应用此催化剂生产的聚烯烃产量快速增加，正逐渐挤占非茂金属聚烯烃市场，而国内还没有茂金属聚烯烃的生产，产业前景广阔。推介了国外发展该技术及其产业的一些做法。     

ON THE ROBUST PREDICTION AND INTERPOLATION OF TIME SERIES IN THE PRESENCE OF CORRELATED NOISE

Abstract. We consider the problem of predicting and interpolating linearly a time series which can be represented as the sum of a model process with known spectral density and a noise process. The spectral density of the noise process is unknown with the exception of an upper bound for its integral. Some partial information of quite general kind about the cross spectral density of model and noise is available. We prove the existence of a robust predictor which minimizes the maximal mean-square error, where the maximum is taken over all spectral densities which may arise from the circumstances described above as spectral density of the predicted time series. An analogous result holds for the related interpolation problem. We describe how to derive the minimax robust predictor and interpolator in concrete situations. The method is illustrated by determining the robust predictor explicitly for three examples where model and noise may be arbitrarily, only causally or not at all correlated.     

聚四氟乙烯改性剂的制备及性能

介绍了隔膜法氯碱所用的聚四氟乙烯改性剂，即聚四氟乙烯乳液、聚四氟乙烯纤维（SM-1）、聚四氟乙烯类纤维（SM-2）的制造原理、制造方法以及在隔膜法氯碱上的应用效果。     

探讨用电信息采集一体化建设

目前,大多数地区仍需要通过人工的方式进行电力管理,而信息采集的一体化建设能够突破传统人工的限制,提升管理效率。     

GIS在电力配网系统的应用及价值

随着经济社会的转型升级,配电网的规模越来越大。技术与设备密集型企业的增多,对电力配网系统提出了更高的要求。介绍了配电GIS系统的建设意义、系统设计目标及其在电力配网系统中的应用。     

浅析加快300 MW机组启动速度的方法及措施

随着电网的装机容量日益增大,机组的启动次数也在逐日增多。从保证机组安全经济运行的角度出发,结合笔者直接或间接参与制定的技术措施,简要分析了影响机组启动速度的因素和改善措施,以期为其他发电厂在机组启动方面提供一些参考和建议。     

经验分析电价与电费管理的稽查

为进一步提升电价与电费管理的工作质量,采取有效措施、深入落实各管理环节的稽查工作是非常必要的。结合自身的工作经验,以电价稽查、电费账务处理等内容为切入点,对电价与电费管理的稽查作一综述,以供业内同行参考。