检索结果-南通市图书馆

Probabilistic Anomaly Detection Approach for Data-driven Wind Turbine Condition Monitoring

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2019年第2期5卷 149-158页

作者： Yuchen Zhang meng Li zhao yang Dong Ke meng School of Electrical Engineering and Telecommunications University of New South WalesSydneyAustralia School of Information and Control Engineering China University of Mining and TechnologyXuzhouJiangsuChina

Continuous monitoring of wind turbine(WT)opera-tion can improve the reliability of the wind turbine and lower the operation and maintenance *** improve the condition mon-itoring(CM)and fault detection performance on WTs,this paper proposes an artificial intelligence-based probabilistic anomaly detection approach that can not only provide a deterministic estimation of the WT condition but also evaluate the uncertainties associated with the *** abnormal WT condition is detected based on the evaluated uncertainties,to provide a noise-free incipient fault *** to the conventional deterministic CM approaches with a residual-based anomaly detection criterion,the proposed probabilistic approach tends to accurately detect the faults earlier,which allows more time for maintenance scheduling to prevent WT component *** early fault detection ability of the proposed approach was verified on an operational WT in China.

关键词： Terms-Condition monitoring faultdetection probabilisticregression SCADA windturbine

Fully discrete two-step mixed element method for the symmetric regularized long wave equation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Modeling, Simulation, and Scientific Computing 2014年第3期5卷 88-103页

作者： meng zhao yang Liu Hong Li School of Mathematical Sciences Inner Mongolia University Hohhot 010021 P.R.China

A numerical method based on the explicit two-step method in time direction and the mixed finite element method in spatial direction is presented for the symmetric regularized long wave(SRLW)*** optimal a priori error estimates(O((∆t)^(2)+h^(m+1)+h^(k+1)))for fully discrete explicit two-step mixed scheme are ***,a numerical example is provided to confirm our theoretical results.

关键词： SRLW equation two-step method mixed finite element method a priori error estimates optimal convergence

Optimal control of automated left-turn platoon at contraflow left-turn lane intersections

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Intelligent and Connected Vehicles 2022年第3期5卷 206-214页

作者： Hanyu yang Jing zhao meng Wang Department of Traffic Engineering University of Shanghai for Science and TechnologyShanghaiChina Chair of Traffic Process Automation Technische Universität DresdenDresdenGermany

Purpose–This study aims to propose a centralized optimal control model for automated left-turn platoon at contraflow left-turn lane(CLL)***/methodology/approach–The lateral lane change control and the longitudinal acceleration in the control horizon are optimized simultaneously with the objective of maximizing traffic efficiency and *** proposed model is cast into a mixed-integer linear programming problem and then solved by the branch-and-bound ***–The proposed model has a promising control effect under different geometric controlled ***,the proposed model performs robustly under various safety time headways,lengths of the CLL and green times of the main ***/value–This study proposed a centralized optimal control model for automated left-turn platoon at CLL *** lateral lane change control and the longitudinal acceleration in the control horizon are optimized simultaneously with the objective of maximizing traffic efficiency and smoothness。

关键词： Contraflow left-turn lane intersections Automated vehicle platoon Optimal control Vehicular trajectory Automated vehicles Connected vehicles Cooperative intelligence Following control Vehicle-to-vehicle communication(V2V)

Optical fluence compensation for handheld photoacoustic probe:An in vivo human study case

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Innovative Optical Health Sciences 2017年第4期10卷 91-98页

作者： Lingyi zhao meng yang Yuxin Jiang Changhui Li Department of Biomedical Engineering College of Engineering Peking UniversityBeijingChina Department of Ultrasonography Peking Union Medical College Hospital Chinese Academy of Medical Sciences&Peking Union Medical College Beijing 100730China

Integrating photoacoustic(PA)and ultrasound(US)into a handheld probe to perform P A/US dual-modal imaging has been widely studied over the past few ***,optical fuence decreases quickly in deeper tissue due to light scattering and absorption,which would signifi-cantly affect the quantitative PA *** this paper,we performed a fluence compensation for a PA imaging study of human *** comparison of P A/US image with and without optical fuence compensation demonstrated that the fuence compensation could effectively improve imaging quality for handheld probe.

关键词： PA imaging ultrasound optical fluence

Investigation on a vertical radial flow adsorber designed by a novel parallel connection method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2018年第3期26卷 484-493页

作者： Zhengshu Dai meng Yu Daozhe Rui Xuejun Zhang yang zhao School of Energy and Power Engineering University of Shanghai for Science and Technology Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province Institute of Refrigeration and Cryogenics Zhejiang University

Due to the increasing global demand for industrial gas, the development of large-scale cryogenic air separation systems has attracted considerable attention in recent years. Increasing the height of the adsorption bed in a vertical radial flow adsorber used in cryogenic air separation systems may efficiently increase the treatment capacity of the air in the adsorber. However, uniformity of the flow distribution of the air inside the adsorber would be deteriorated using the height-increasing method. In order to reduce the non-uniformity of the flow distribution caused by the excessive height of adsorption bed in a vertical radial flow adsorber, a novel parallel connection method is proposed in the present work. The experimental apparatus is designed and constructed; the Computational Fluid Dynamics(CFD) technique is used to develop a CFD-based model, which is used to analyze the flow distribution, the static pressure drop and the radial velocity in the newly designed adsorber. In addition, the geometric parameters of annular flow channels and the adsorption bed thickness of the upper unit in the parallelconnected vertical radial flow adsorber are optimized, so that the upper and lower adsorption units could be penetrated by air simultaneously. Comparisons are made between the height-increasing method and the parallel connection method with the same adsorber height. It is shown that using the parallel connection method could reduce the difference between the maximum and minimum radial static pressure drop by 86.2% and improve the uniformity by 80% compared with those of using the height-increasing method. The optimal thickness ratio of the upper and lower adsorption units is obtained as 0.966, in which case the upper and lower adsorption units could be penetrated by air simultaneously, so that the adsorbents in adsorption space could be used more efficiently.

关键词： Air separation Purification Vertical radial flow adsorber Flow distribution Optimization

Emergency Control Strategy for Power Systems with Renewables Considering a Utility-scale Energy Storage Transient

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2021年第5期7卷 986-995页

作者： Xuekuan Xie Yuchen Zhang Ke meng zhao yang Dong Junwei Liu School of Electrical Engineering and Telecommunications University of New South WalesSydneyNSW 2052

Integration of renewable energy generators has greatly altered both static and dynamic characteristics of the *** with the uncertainties it introduced,the risk of a system being transient instable is significantly *** paper proposes a multi-objective coordinated post-contingency control *** aims to increase post-contingency system security with emergence control(EC)while minimizing the total control *** ECs are adopted in this paper:energy storage systems(ESSs)and emergency load shedding(ELS).ESSs are immediately connected to the network after contingency occurrence to provide both active and reactive power *** will be triggered when the support from ESSs is insufficient to stabilize the system to prevent further deterioration of system *** of the proposed method was evaluated on a modified New England 39-bus benchmark *** results indicate that the proposed method can find solutions to stabilize the system against credible contingencies and optimally balance between system stability and economy.

关键词： Emergency control energy storage renewable energy uncertainty system modelling transient stability

基于Caprini评分的肺癌患者合并静脉血栓栓塞的影响因素

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

吉林医学 2023年第9期44卷 2404-2408页

作者：周丽勤高天慧赵孟阳刘珊珊河南大学人民医院河南省人民医院肿瘤内科河南郑州450003

目的:探讨在不同Caprini评分水平下,肺癌患者发生静脉血栓栓塞的影响因素。方法:选取66例肺癌合并静脉血栓的患者作为试验组,以66例同时期肺癌未合并静脉血栓的患者作为对照组。采用Caprini血栓风险评估模型对两组患者进行风险评分及危... 详细信息

目的:探讨在不同Caprini评分水平下,肺癌患者发生静脉血栓栓塞的影响因素。方法:选取66例肺癌合并静脉血栓的患者作为试验组,以66例同时期肺癌未合并静脉血栓的患者作为对照组。采用Caprini血栓风险评估模型对两组患者进行风险评分及危险度分级。通过统计学方法分析肺癌患者发生静脉血栓的高危因素。结果:通过Caprini评分将肺癌患者分为高危(3~4分)和极高危(≥5分)两个等级,单因素分析后Caprini评分分级为高危肺癌患者中,试验组性别、红细胞计数、血红蛋白、凝血酶原时间(PT)、D-二聚体、总蛋白、白蛋白与对照组比较,差异有统计学意义(P250×10^(9)/L为肺癌患者发生静脉血栓的独立危险因素。结论:女性、红细胞计数、血红蛋白、PT、D-二聚体、总蛋白、白蛋白是Caprini评分分级为高危的肺癌患者发生静脉血栓的危险因素,其中女性、白蛋白250×10^(9)/L是独立危险因素。

关键词：肺癌静脉血栓 Caprini评分影响因素

医用显示器几何失真与显示分辨率的视觉评价方法研究

在线全文

学校读者我要写书评

暂无评论

中国医疗器械信息 2019年第11期25卷 37-38页

作者：孟昭阳马跃孙智勇金玉博辽宁省检验检测认证中心辽宁沈阳110036

重点讨论医用显示系统的几何失真和显示分辨率的概念以及视觉评价方法。

关键词：医用显示器几何失真显示分辨率

在线全文

学校读者我要写书评

暂无评论

食品中贝类过敏原的质谱定量分析方法研究

核农学报 2025年第2期39卷 329-338页

作者：杨沛洁孟俊宏赵晗林浩鹏关文强王凤玲杨术鹏李熠天津商业大学生物技术与食品科学学院天津市食品生物技术重点实验室天津300134 中国农业科学院农产品加工研究所北京100193

鉴于贝类是重要的过敏食物,为健全食品中贝类过敏原的定量分析方法、精准识别与检测食品中的贝类过敏原,本研究基于靶向蛋白质谱定量分析技术,开发了预制食品中蛤蜊过敏原的定量分析方法:样品经蛋白质的提取和酶解后,通过液相串联高分... 详细信息

鉴于贝类是重要的过敏食物,为健全食品中贝类过敏原的定量分析方法、精准识别与检测食品中的贝类过敏原,本研究基于靶向蛋白质谱定量分析技术,开发了预制食品中蛤蜊过敏原的定量分析方法:样品经蛋白质的提取和酶解后,通过液相串联高分辨质谱和Peaks软件进行数据采集与分析;针对蛤蜊中的原肌球蛋白,经系统考察其酶解后肽段的特异性、质谱信号丰度、热稳定性等,筛选出ITELSEELAVVGNNCK作为最佳定量肽段;针对筛选出的肽段,采用液相串联三重四极杆质谱构建蛤蜊过敏原的定量分析方法,并进行系统的方法验证。结果表明,该方法具有良好的特异性、灵敏度[定量限(LOQ)为10 mg·kg^(-1)]、准确度(回收率为78%~105.3%)和精密度(日内和日间变异系数均<13.0%)。用该法检测分析实际样品发现,部分预制食品中存在蛤蜊过敏原的污染,但未进行明确标识。本研究开发的方法可为食品中贝类过敏原的风险监测提供技术和方法支撑。

关键词：过敏原贝类蛤蜊定量分析质谱分析

维普期刊数据库博看期刊