110kV江南站内电缆终端跳线接线方式优化改造设想

本文通过对110kV江南站内电缆终端现状接线方式的分析,并根据现场实际情况,设想对110kV江南站内电缆终端跳线接线方式进行优化改造,改造后实现当连接江南站任意一端电缆发生故障或需要检修时,通过调整跳线方式使江南站主变可以快速恢复供电。     

中国学龄前男童连续薄层标本数据集建立及可视化

目的 建立国人学龄前男童连续超薄解剖标本数据集,并行可视化应用研究。方法 选择经64排螺旋CT 和3.0T MRI全身扫描排除器质性病变和畸形的男童标本,6周岁,身高1.14 m,体重23 kg,发育正常,皮肤、内脏无破损,整体无挤压变形。经定型、冷冻及包埋,置于-25 ℃冷库中3周,由山东数字人公司在-25 ℃低温实验室中逐层数控冷冻无锯损铣切,从脚到头0.10 mm铣切,使用Rencay16k3Scanback相机逐层扫描获取高清晰度数据集图像。结果 共采集11 421张断面图像,所有图像原始保存为PNG格式,每张图像为13 000像素×8000像素,约27.4 MB,整体学龄前男童数据集共计305.60 G。结论 经文献检索,国内目前尚鲜见有从脚到头完整采集成功的学龄前男童数字化可视人体数据集,成功建立的数字化可视男童数据集,为儿童发育形态研究,各器官虚拟手术入路探索,教材与专著编写及儿童疾病预防、诊治及科普等提供高精度的基础大数据集。     

SPIO-PLL-pshRNA分子探针转染卵巢癌SKOV3细胞及MR成像研究

针对间歇过程的多阶段问题,提出了一种新的划分阶段策略,可以将多阶段的数据进行准确的聚类,得到精确的阶段数目,避免陷入局部最优,提高了建模精度和故障检测准确度。首先采用不同展开方法相结合的方式对三维的间歇过程数据进行处理,消除了数据预估问题;其次结合图划分准则利用谱聚类方法将处理后的数据进行准确的阶段划分,并运用PCA建模方法分别对每一类进行建模;最后通过合适的模型对数据进行在线监控。通过青霉素仿真过程验证了本文方法的有效性。     

以GE Hispeed CT为例分析故障原因及查找方法

以GE公司的GE Hispeed Dxi CT机为例从硬件和软件两个方面分析CT机的常见故障产生原因和查找、排除故障的常用方法。     

裂解炉传感器故障的检测和诊断

研究了综合运用非线性PLS和模糊逻辑的故障检测与诊断方法，并在此基础上，利用大型工业裂解炉现场数据构造了裂解炉传感器集成故障检测系统。应用结果表明，以此方法构成的传感器故障诊断系统可信度较高，且具有良好的实用性和鲁棒性。     

关于老旧输电电缆运行状况分析及运维工作的建议

本文对广州地区运行时间超过20年的110kV及以上交联聚乙烯输电电缆线路的运行状况进行统计分析,经分析认为该部分电缆线路故障率和缺陷率均较低,且未发现有增加趋势,整体运行状况较好,同时根据实际情况在运行、规划、技术研究方面提出了相关运维建议。     

Using Support Vector Machines to Detect Therapeutically Incorrect Measurements by the MiniMed CGMS?

Background

Current continuous glucose monitors have limited accuracy mainly in the low range of glucose measurements. This lack of accuracy is a limiting factor in their clinical use and in the development of the so-called artificial pancreas. The ability to detect incorrect readings provided by continuous glucose monitors from raw data and other information supplied by the monitor itself is of utmost clinical importance. In this study, support vector machines (SVMs), a powerful statistical learning technique, were used to detect therapeutically incorrect measurements made by the Medtronic MiniMed CGMS^®.

Methods

Twenty patients were monitored for three days (first day at the hospital and two days at home) using the MiniMed CGMS. After the third day, the monitor data were downloaded to the physician''s computer. During the first 12 hours, the patients stayed in the hospital, and blood samples were taken every 15 minutes for two hours after meals and every 30 minutes otherwise. Plasma glucose measurements were interpolated using a cubic method for time synchronization with simultaneous MiniMed CGMS measurements every five minutes, obtaining a total of 2281 samples. A Gaussian SVM classifier trained on the monitor''s electrical signal and glucose estimation was tuned and validated using multiple runs of k-fold cross-validation. The classes considered were Clarke error grid zones A+B and C+D+E.

Results

After ten runs of ten-fold cross-validation, an average specificity and sensitivity of 92.74% and 75.49%, respectively, were obtained (see Figure 4). The average correct rate was 91.67%.Open in a separate windowFigure 4Performance of the classifiers obtained in the validation process (ten runs of ten-fold cross-validation) shown on an ROC graph. The average specificity and sensitivity were 92.74% and 75.49%, respectively. TPR, true positive rate; FPR, false positive rate; ROC, receiver operating characteristic.

Conclusions

Overall, the SVM performed well, in spite of the somewhat low sensitivity. The classifier was able to detect the time intervals when the monitor''s glucose profile could not be trusted due to incorrect measurements. As a result, hypoglycemic episodes missed by the monitor were detected.     

数字化X射线摄影成像系统锐珂DRX-Evolution常见故障维修

统计近年来锐珂DRX-Evolution所发生的故障,对故障案例进行汇总,对故障类型进行分类,对维修过程进行总结。故障类型可以分为三个大类,每一类故障有其特点及特定的解决办法。应掌握设备的构造及其工作原理,根据其故障类型及特点,采取合适的维修方法,排除故障。     

Integrated fault tolerant attitude control approach for satellite attitude system with sensor faults

In this study, a novel integrated fault tolerant control (FTC) strategy is proposed for a rigid satellite attitude systems under the case of external disturbance, Lipschitz nonlinearity, and sensor faults. Different from the traditional adaptive fault estimation method, an augmented fault estimation observer is designed for the considered faulty satellite attitude system, which could be used for estimating both system state and sensor fault. A virtual observer is firstly introduced, and then, a real observer is derived as a result of the unmeasurable information to be used for the design of the virtual observer. On this basis, an integrated FTC approach is developed for the considered faulty satellite attitude system by combining backstepping control and fractional order nonsingular terminal sliding mode control techniques, such that the closed-loop system not only has good robustness to external disturbance but also has better fault tolerance capability to unknown sensor fault. Finally, a simulation example is provided to demonstrate the feasibility and advantage of the proposed FTC scheme.     

110kV电缆附件故障统计分析

通过对某地区20多年来17起110kV电缆线路电缆附件故障进行统计分析,提出加强现场安装质量控制, 开展带电局放状态监测和竣工试验同步进行局放测试等手段,提前发现电缆附件缺陷,同时提出预防故障的改进 措施。