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Information Entropy Based Prioritization Strategy for Data-driven Transient Stability Batch Assessment

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CSEE Journal of Power and Energy Systems 2021年第3期7卷 443-455页

作者： Rong Yan zhaoyu Wang Yuxuan Yuan Guangchao Geng Quanyuan jiang College of Electrical Engineering Zhejiang UniversityHangzhouZhejiang 310027China Department of Electrical and Computer Engineering Iowa State UniversityAmesIA 50011USA

Transient stability batch assessment(TSBA)is es-sential for dynamic security check in both power system planning and day-ahead dispatch.It is also a necessary technique to generate sufficient training data for data-driven online transient stability assessment(TSA).However,most existing work suffers from various problems including high computational burden,low model adaptability,and low performance robustness.Therefore,it is still a significant challenge in modern power systems,with numerous scenarios(e.g.,operating conditions and"N-k"contin-gencies)to be assessed at the same time.The purpose of this work is to construct a data-driven method to early terminate time-domain simulation(TDS)and dynamically schedule TSBA task queue a prior,in order to reduce computational burden without compromising accuracy.To achieve this goal,a time-adaptive cas-caded convolutional neural networks(CNNs)model is developed to predict stability and early terminate TDS.Additionally,an information entropy based prioritization strategy is designed to distinguish informative samples,dynamically schedule TSBA task queue and timely update model,thus further reducing simulation time.Case study in IEEE 39-bus system validates the effectiveness of the proposed method.

关键词： Cascaded convolutional neural networks(CNNs) dynamic task queue information entropy based prioritization strategy time-domain simulation(TDS) transient stability batch assessment(TSBA)

Deposition pattern of drying droplets

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Communications in Theoretical Physics 2021年第4期73卷 130-141页

作者： Xiuyuan Yang Zechao jiang Peihan Lyu zhaoyu Ding Xingkun Man Center of Soft Matter Physics and its Applications Beihang UniversityBeijing 100191China School of Physics Beihang UniversityBeijing 100191China

The drying of liquid droplets is a common daily life phenomenon that has long held a special interest in scientific research.When the droplet includes nonvolatile solutes,the evaporation of the solvent induces rich deposition patterns of solutes on the substrate.Understanding the formation mechanism of these patterns has important ramifications for technical applications,ranging from coating to inkjet printing to disease detection.This topical review addresses the development of physical understanding of tailoring the specific ring-like deposition patterns of drying droplets.We start with a brief introduction of the experimental techniques that are developed to control these patterns of sessile droplets.We then summarize the development of the corresponding theory.Particular attention herein is focused on advances and issues related to applying the Onsager variational principle(OVP)theory to the study of the deposition patterns of drying droplets.The main obstacle to conventional theory is the requirement of complex numerical solutions,but fortunately there has been recent groundbreaking progress due to the OVP theory.The advantage of the OVP theory is that it can be used as an approximation tool to reduce the high-order conventional hydrodynamic equations to first-order evolution equations,facilitating the analysis of soft matter dynamic problems.As such,OVP theory is now well poised to become a theory of choice for predicting deposition patterns of drying droplets.

关键词： drying droplet deposition pattern Onsager variational principle

Precise in-situ and ex-situ study on thermal behavior of LiNi_(1/3)Co_(1/3)Mn_(1/3)O_(2)/graphite coin cell:From part to the whole cell

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Journal of Energy Chemistry 2021年第3期30卷 332-341页

作者： Chen Liang Lihua jiang Shuliang Ye zhaoyu Wang Zesen Wei Qingsong Wang Jinhua Sun State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026AnhuiChina Institute of Industry and Trade Measurement Technology China Jiliang UniversityHangzhou 310018ZhejiangChina

Multiple mode calorimetry and C80 micro-calorimeter are used to investigate the impact of cathode and anode on heat generation of lithium ion battery.The thermal behaviors of LiNi_(x)Co_(y)Mn_(z)O_(2)/graphite full cell are discussed under normal operating and elevating temperature.Affected by negative entropy change,lithium intercalation presents more exotherms than deintercalation for both electrode materials.The contributions of irreversible and reversible heat to the total heat generation of graphite are evaluated.The phase transitions correlated with voltages and lithium contents are determined.Based on the analysis of half-cell,the effect of two electrodes(with the same capacity)on overall heat generation is nearly the same and anode of full cell plays a key role in charging while cathode dominates in discharging.Thermal behaviors of lithiated graphite and delithiated LiNi_(x)Co_(y)Mn_(z)O_(2) electrolyte and their coexisting system are identified to further explore their influence on battery safety.The breakdown of solid electrolyte interface(SEI)at around 82℃ is considered as a crucial factor affecting the thermal stability of full cell.The oxidation of electrolyte induced by oxygen released from cathode material turns out to be one of the main heat sources.These accurate results are of great significance to improve the existing thermal management system and provide basic data for the prediction of battery performance.

关键词： Lithium ion battery safety Heat generation Micro-calorimetry Electrode materials

Review of Wind Power Forecasting Methods:From Multi-spatial and temporal Perspective

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Review of Wind Power Forecasting Methods:From Multi-spatial ...

Hydrodynamic Behavior in a Tapered Bubble Column

第36届中国控制会议

作者： Zhaoyu jiang Qing-Shan Jia Xiaohong Guan Center for Intelligent and Networked Systems(CFINS) Department of AutomationTsinghua National Laboratory for Information Science and TechnologyTsinghua University MOE KLINNS Lab Xi'an Jiaotong University

ISBN: (纸本)9781538629185

Wind power is one of the most popular renewables and occupies a great proportion in the total capacity of the grid system.Secure operations of the grid system such as scheduling and dispatching dependent much on the prediction accuracy of power generation.This paper reviews wind power forecasting methods in multi-spatial scales and multi-temporal scales.In different spatial scales,methods for a single turbine,a wind farm,and even a large wind power generation area are considered in three parts respectively.In each part,firstly,forecasting methods are divided into methods with only historical wind information and methods with additional meteorological information,and then,classified up to four different temporal scales.Discussion about the similarity and discrepancy of these methods are also presented at the end of each part.Finally,this paper gives two examples of real applications where wind power forecasting methods are significant.

关键词： Wind power forecasting Forecast method Temporal scale Spatial scale Review

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Chemical Research in Chinese Universities 2004年第4期20卷 478-482页

作者： ZHANGKai zhaoyu-long ZHANGBi-jiang StateKeyLabofHeavyOilProcessing FacultyofChemicalScienceandEngineeringUniversityofPetroleumBeijing102249P.R.China InstituteofCoalChemistry ChineseAcademyofSciencesPOBox65TaiyuanP.R.China

The experiment was conducted to explore the hydrodynamics in a conical column with a height of 3.00 m, and a taper angle of 1.91°. Three regimes occur in succession with increasing superficial gas velocity. Overall gas holdup increases with an increase in gas velocity and a decrease in solid concentration or static slurry height. Axial solid holdup becomes more uniform with increasing gas velocity, while axial gas holdup decreases from the bottom to the top. Both dry and wet pressure drops across the gas distributor increase with an increase in superficial gas velocity.

关键词： Tapered slurry bubble column Flow regime transition Overall gas holdup Axial holdups profile Distributor pressure drop

官员晋升激励与企业实际税负——来自制造业上市企业的证据

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中国经济问题 2022年第1期 76-93页

作者：姜先登康赵宇西南财经大学财政税务学院西安交通大学城市学院

本文以2009—2015年中国制造业A股上市公司作为数据样本,实证考察地方官员晋升激励对辖区企业实际税负的影响。实证结果发现,官员的晋升激励显著降低了企业实际税负,该影响对处于东部地区企业的实际税负影响更为显著,对国有企业和有政... 详细信息

本文以2009—2015年中国制造业A股上市公司作为数据样本,实证考察地方官员晋升激励对辖区企业实际税负的影响。实证结果发现,官员的晋升激励显著降低了企业实际税负,该影响对处于东部地区企业的实际税负影响更为显著,对国有企业和有政治关联企业的实际税负的降低作用更为明显。此外,本文探索官员晋升对企业实际税负的作用机制,揭示了税收征管强度在二者关系中的中介作用。以此阐释了地方官员晋升所带来的税收征管变化,以期为中国未来的税制改革提供一定的启示。

关键词：官员晋升激励企业实际税负税收征管

循环肿瘤DNA在结直肠癌临床管理中的研究进展

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中华胃肠外科杂志 2024年第3期27卷 287-294页

作者：姜照宇付卫北京大学第三医院普通外科北京大学第三医院肿瘤中心北京100191

近年来,结直肠癌(CRC)在诊疗方面取得长足进步,但目前标准治疗方案仍存在诸多不足,因此亟需更有效的生物标志物,用于患者的个性化治疗。循环肿瘤DNA(ctDNA)检测作为一种动态、非侵入性的液体活检方法,克服了组织活检在检测肿瘤异质性和... 详细信息

近年来,结直肠癌(CRC)在诊疗方面取得长足进步,但目前标准治疗方案仍存在诸多不足,因此亟需更有效的生物标志物,用于患者的个性化治疗。循环肿瘤DNA(ctDNA)检测作为一种动态、非侵入性的液体活检方法,克服了组织活检在检测肿瘤异质性和分子演变中的不足。多项研究证据表明,ctDNA在复发风险分层、指导治疗决策和早期复发监测等方面展现出巨大前景。此外,ctDNA的应用还可提高临床研究的效率和药物开发。然而,ctDNA检测前变量和分析过程的标准化尚未统一,其技术成本也较高昂,这些均限制了其推广应用。本文总结了关于ctDNA在CRC临床管理中的现有证据,并提出了其局限性和改进策略。

关键词：结直肠肿瘤循环肿瘤DNA 风险分层复发监测

Dynamic Modeling and Flight Simulation of a Folding Wing-Tip UAV

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Dynamic Modeling and Flight Simulation of a Folding Wing-Tip...

第32届中国控制与决策会议

作者： Jie Yang Liyan Wen Bin jiang zhaoyu Wang Department of Automation Engineering Nanjing University of Aeronautics and Astronautics jiangsu Key Laboratory of Internet of Things and Control Technologies

In this paper,a novel modeling method and the aerodynamic analysis of folding wing-tip UAVs are proposed.The folding wing-tip UAV models are established by treating the aircraft as a single body but relaxing the condition of rigidity.As a typical kind of folding wing-tip UAVs,NASA spanwise adaptive wing morphing UAV（SAW） is modeled and analyzed in this paper.The missile datcom is also applied to analyze the aerodynamic performance during the folding process of wing-tip by establishing the 3 D model of the SAW and conducting numeric simulations.

关键词： Morphing Aircraft Aerodynamic Modeling Missile DATCOM

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大庆油田产出剖面测井技术研究与优化选择

石油管材与仪器 2019年第3期5卷 76-79页

作者：姜兆宇大庆油田有限责任公司测试技术服务分公司

归纳总结了大庆油田生产测井领域应用比较广泛的产出剖面测井技术,简单阐述了各产出剖面测井技术的特点以及应用适应范围,同时介绍了产出剖面测井技术的新进展。最后梳理了不同流量、不同介质下仪器的优化选择方案,梳理出的结果对前线... 详细信息

归纳总结了大庆油田生产测井领域应用比较广泛的产出剖面测井技术,简单阐述了各产出剖面测井技术的特点以及应用适应范围,同时介绍了产出剖面测井技术的新进展。最后梳理了不同流量、不同介质下仪器的优化选择方案,梳理出的结果对前线生产工作人员测井技术的优化选择有借鉴意义。

关键词：测井技术产出剖面含水率优化选择