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Journal of Systems Science & Complexity 2024年第4期37卷 1507-1525页

作者： ZHANG Zhibing ZHOU Dapeng WANG Yeguang gao wanxin ZHANG Yanjun AVIC Shenyang Aircraft Design and Research Institute Shenyang 110035China School of Automation Beijing Institute of TechnologyBeijing 100081China State Key Lab of Autonomous Intelligent Unmanned Systems Beijing Institute of TechnologyBeijing 100081China

The stability margin is a vital indicator for assessing the safety level of aircraft control *** should maintain sufficient stability margin to ensure safety during flight,especially in the process of large maneuver *** stability margin is generally quantified by the Bode diagram,which strictly depends on the system parameters and the open-loop transfer ***,due to the uncertain flight environments,transmission delays of sensors and mode switchings,etc.,there exist large parameter and structure uncertainties in the aircraft control systems,which make it difficult to precisely configure the stability margin to the desired value by the usual control *** address this problem,an indirect adaptive control strategy is proposed in this paper,where an adaptive PI control law with the capability of self-configuration of stability margin is *** developed control law not only achieves stable time-varying command tracking in the time domain,but also is able to automatically configure the phase margin and gain margin in the frequency ***,the simulation of the one-degree-of-freedom roll rate control model of the air vehicle verifies the validity of the proposed control method.

关键词： Adaptive control aircraft control parameter uncertainty stability margin configuration

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预防高压开关柜误入带电间隔探讨

电工技术 2024年第S1期 257-258,262页

作者：高万鑫淮浙电力有限责任公司凤台发电分公司安徽淮南232000

分析高压开关柜设备维护检修过程中发生的误入带电间隔造成的人员伤亡、设备损坏事件,设计一套基于红外感应声光报警系统,通过红外传感器检测检修人员操作意向并提示检修人员当前设备间隔名称、运行状态、带电情况及误操风险,从而防止... 详细信息

分析高压开关柜设备维护检修过程中发生的误入带电间隔造成的人员伤亡、设备损坏事件,设计一套基于红外感应声光报警系统,通过红外传感器检测检修人员操作意向并提示检修人员当前设备间隔名称、运行状态、带电情况及误操风险,从而防止作业人员误入带电间隔事故发生。

关键词：红外感应高压开关柜带电间隔

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雷达物位计在电厂中的选型及应用

电力系统装备 2024年第4期 45-47页

作者：刘聪高万鑫承浩孙毅淮浙电力有限责任公司安徽淮南232100

随着生产自动化和智能化的不断深化,物位测量技术也逐渐智能化。在电厂中,物位计被视为测量存储设备中物料位置的核心设备。文章阐述了电厂内物位计的工作原理、种类及其在电厂中的实际应用。物位计可根据需要选择不同类型,并通过安装... 详细信息

随着生产自动化和智能化的不断深化,物位测量技术也逐渐智能化。在电厂中,物位计被视为测量存储设备中物料位置的核心设备。文章阐述了电厂内物位计的工作原理、种类及其在电厂中的实际应用。物位计可根据需要选择不同类型,并通过安装位置来实现对储料仓内物高数据的监测与控制。借助物位计技术,对存储设备中的储料物位进行准确监测,从而提高电厂的生产效率并确保其稳定和安全的运行。

关键词：物位计电厂分类

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导向式框架断路器拉弧分析及预防

科学技术创新 2024年第7期 213-216页

作者：刘聪承浩孙毅高万鑫庞昊淮浙电力有限责任公司凤台发电分公司安徽淮南

本文基于导向式框架式断路器在使用过程中,发生连接排触头及框架母线触头发生故障拉弧及触点烧毁实际情况,提出技术和管理上的改进。发生故障电弧时,其电流并未达到脱扣器设定的脱扣电流。对故障断路器位置指示的摇进机构进行解体后发现... 详细信息

本文基于导向式框架式断路器在使用过程中,发生连接排触头及框架母线触头发生故障拉弧及触点烧毁实际情况,提出技术和管理上的改进。发生故障电弧时,其电流并未达到脱扣器设定的脱扣电流。对故障断路器位置指示的摇进机构进行解体后发现,位置指示磨损,工作人员的不规范操作,造成止动片断裂,从而使断路器发生拉弧事故。结合以上情况制定的预防措施为:定期检查摇进机构的位置指示情况、止动片磨损或断裂情况,对操作人员进行正规操作的培训。

关键词：故障电弧导向式框架断路器摇柄机构故障

Thermal and mechanical behavior of casting copper alloy wheel during wheel and belt continuous casting process

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China Foundry 2024年第1期21卷 82-90页

作者： Kun gao Yan Peng School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina

To investigate the thermal and mechanical behavior of casting wheel,a two-dimensional thermoelastic-plastic finite element model was used to predict the temperature,stress and distortion distribution of the casting wheel during the wheel and belt continuous casting *** effects of grinding thickness and casting speed on the thermal and mechanical behaviors of the center of the hot face of the casting wheel were discussed in *** each rotation,the casting wheel passes through four different spray *** results show that the temperature distribution of the casting wheel in different spray zones is similar,the temperature of the hot face is the highest and the temperature reaches the peak in the spray zoneⅢ.The stress and distortion depend on the temperature distribution,and the maximum stress and distortion of the hot face are 358.2 MPa and 1.82 mm,*** temperature at the center of the hot face decreases with increasing grinding thickness and increases with increasing casting speed.

关键词： casting wheel finite element model grinding thickness casting speed hot face spray zones

On the core entropy of Newton maps

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Science China Mathematics 2024年第1期67卷 77-128页

作者： Yan gao Department of Mathematics Shenzhen UniversityShenzhen 518060China

In this paper,we define the core entropy for postcritically-finite Newton maps and study its continuity within this *** show that the entropy function is not continuous in this family,which is different from the polyn... 详细信息

关键词： core entropy extended Newton graph critical marking polynomial Newton map

Durable poly(binaphthyl-co-p-terphenyl piperidinium)-based anion exchange membranes with dual side chains

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Journal of Energy Chemistry 2024年第2期89卷 324-335,I0008页

作者： Weiting gao Xuelang gao Qiugen Zhang Aimei Zhu Qinglin Liu Department of Chemical&Biochemical Engineering Fujian Provincial Key Laboratory of Theoretical and Computational ChemistryThe College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina Department of Chemistry Pohang University of Science and Technology(POSTECH)Pohang 790-784South Korea

Building well-developed ion-conductive highways is highly desirable for anion exchange membranes(AEMs).Grafting side chain is a highly effective approach for constructing a well-defined phaseseparated morphological structure and forming unblocked ion pathways in AEMs for fast ion *** of side chains can further enhance phase separation due to the superhydrophobic nature of fluorine ***,their electronic effect on the alkaline stability of side chains and membranes is rarely ***,fluorine-containing and fluorine-free side chains are introduced into the polyaromatic backbone in proper configuration to investigate the impact of the fluorine terminal group on the stability of the side chains and membrane *** poly(binaphthyl-co-p-terphenyl piperidinium)AEM(QBNp TP)has the highest molecular weight and most dimensional stability due to its favorable backbone arrangement among ortho-and meta-terphenyl based ***,by introducing both a fluorinated piperidinium side chain and a hexane chain into the p-terphenyl-based backbone,the prepared AEM(QBNp TP-QFC)presents an enhanced conductivity(150.6 m S cm^(-1))and a constrained swelling at 80℃.The electronic effect of fluorinated side chains is contemplated by experiments and *** results demonstrate that the presence of strong electro-withdrawing fluorine groups weakens the electronic cloud of adjacent C atoms,increasing OH^(-)attack on the C atom and improving the stability of piperidinium *** QBNp TP-QFC possesses a robust alkaline stability at 80℃(95.3%conductivity retention after testing in 2 M Na OH for 2160 h).An excellent peak power density of 1.44 W cm^(-2)and a remarkable durability at 80℃(4.5%voltage loss after 100 h)can be observed.

关键词： Anion exchange membranes Backbone structure Fluorinated side chain Alkaline stability

Effect of mesopore spatial distribution of HZSM-5 catalyst on zinc state and product distribution in 1-hexene aromatization

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Chinese Journal of Chemical Engineering 2024年第3期67卷 16-26页

作者： Chenhao Wei Di gao Guohao Zhang Liang Zhao Jinsen gao Chunming Xu The State Key Lab of Heavy Oil Processing China University of Petroleum(Beijing)Beijing 102249China SINOPEC Research Institute of Petroleum Processing Co. Ltd.Beijing 100083China

1-hexene aromatization is a promising technology to convert excess olefin in fluid catalytic cracking(FCC)gasoline to high-value benzene(B),toluene(T),and ***,the increasing market demand of xylene has put forward higher requirements for new generation of *** increasing xylene yield in 1-hexene aromatization,the effect of mesopore structure and spatial distribution on product distribution and Zn loading was *** with different mesopore spatial distribution were prepared by post-treatment of parent HZSM-5 zeolite,including NaOH treatment,tetra-propylammonium hydroxide(TPAOH)treatment,and *** was found the evenly distributed mesopore mainly prolongs the catalyst lifetime by enhancing diffusion properties but reduces the aromatics selectivity,as a result of damage of micropores close to the catalyst *** the selectivity of high-value xylene can be highly promoted when the mesopore is mainly distributed interior the ***,the state of loaded Zn was also affected by mesopores spatial *** the optimized catalyst,the xylene selectivity was enhanced by 12.4%compared with conventional Zn-loaded parent HZSM-5 catalyst at conversion over 99%.It was attributed to the synergy effect of mesopores spatial distribution and optimized acid *** work reveals the role of mesopores in different spatial positions of 1-hexene aromatization catalysts in the reaction process and the influence on metal distribution,as well as their synergistic effect two on the improvement of xylene selectivity,which can improve our understanding of catalyst pore structure and be helpful for the rational design of high-efficient catalyst.

关键词： 1-Hexene aromatization Alkali treatment Xylene selectivity Mesopores Zinc state

Impacts of central-Pacific El Niño and physical drivers on eastern Pacific bigeye tuna

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Journal of Oceanology and Limnology 2024年第3期42卷 972-987页

作者： Peng LIAN Le gao Key Laboratory of Ocean Observation and Forecasting and Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China

Bigeye tuna Thunnus obesus is an important migratory species that forages deeply,and El Niño events highly influence its distribution in the eastern Pacific *** sea surface temperature is widely recognized as the main factor affecting bigeye tuna(BET)distribution during El Niño events,the roles of different types of El Niño and subsurface oceanic signals,such as ocean heat content and mixed layer depth,remain *** conducted A spatial-temporal analysis to investigate the relationship among BET distribution,El Niño events,and the underlying oceanic signals to address this knowledge *** used monthly purse seine fisheries data of BET in the eastern tropical Pacific Ocean(ETPO)from 1994 to 2012 and extracted the central-Pacific El Niño(CPEN)indices based on Niño 3 and Niño ***,we employed Explainable Artificial Intelligence(XAI)models to identify the main patterns and feature importance of the six environmental variables and used information flow analysis to determine the causality between the selected factors and BET ***,we analyzed Argo datasets to calculate the vertical,horizontal,and zonal mean temperature differences during CPEN and normal years to clarify the oceanic thermodynamic structure differences between the two types of *** findings reveal that BET distribution during the CPEN years is mainly driven by advection feedback of subsurface warmer thermal signals and vertically warmer habitats in the CPEN domain area,especially in high-yield fishing *** high frequency of CPEN events will likely lead to the westward shift of fisheries centers.

关键词： bigeye tuna central-Pacific El Niño(CPEN) ocean heat content Argo explainable artificial intelligence(XAI) information flow

女性冠状动脉微血管性心绞痛的诊断、治疗进展

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中外女性健康研究 2023年第20期 14-16页

作者：高万欣青海卫生职业技术学院青海西宁810000

冠状动脉微血管功能障碍(coronary microvascular dysfunction,CMVD)主要指冠状前小动脉及其动脉结构在多种致病因素的作用下出现功能异常,最终引发以劳力性心绞痛为主要表现的一组综合征。冠状动脉微血管作为阻力血管,是心肌细胞营养... 详细信息

冠状动脉微血管功能障碍(coronary microvascular dysfunction,CMVD)主要指冠状前小动脉及其动脉结构在多种致病因素的作用下出现功能异常,最终引发以劳力性心绞痛为主要表现的一组综合征。冠状动脉微血管作为阻力血管,是心肌细胞营养供给和代谢产物清除的场所,该部位病变可对下游心肌细胞的灌注造成直接影响。故积极开展科学合理诊疗干预十分必要。

关键词：女性冠状动脉微血管性心绞痛