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一则电梯层门和轿门旁路装置声光信号功能失效的案例

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中国电梯 2024年第3期35卷 33-35页

作者：杨植琨张桢杨世光广州特种设备检测研究院广州510000

针对某曳引驱动电梯层门和轿门旁路装置声光信号功能失效问题,分析了失效原因及风险隐患。经过试验,发现失效的原因是该电梯关门到位信号检测失效,导致维保人员人为屏蔽声光信号功能。通过分析该电梯关门到位检测装置的设计原理,认为关... 详细信息

针对某曳引驱动电梯层门和轿门旁路装置声光信号功能失效问题,分析了失效原因及风险隐患。经过试验,发现失效的原因是该电梯关门到位信号检测失效,导致维保人员人为屏蔽声光信号功能。通过分析该电梯关门到位检测装置的设计原理,认为关门到位检测功能性保护设计存在不足是导致关门到位检测失效的原因。为防范该电梯层门和轿门旁路装置声光信号功能失效,从设计、维保和使用方面提出了措施。

关键词：电梯层门和轿门旁路装置声光信号功能关门到位检测失效原因防范措施

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舰载相控阵雷达天线舱均温性设计研究

舰船科学技术 2024年第17期46卷 137-140页

作者：唐文辉杨志昆孟庆芹张毅沈小清中国船舶集团有限公司第七二四研究所江苏南京211153

针对大型舰载相控阵雷达天线舱的温度控制设计,本文对舰载旋转相控阵雷达天线舱的热负荷进行理论计算,采用数值模拟的方法优化天线舱通风设计,并在实际工作中对天线舱均温性进行试验测试。结果表明,天线舱内部环境温度不超过33.95℃,竖... 详细信息

针对大型舰载相控阵雷达天线舱的温度控制设计,本文对舰载旋转相控阵雷达天线舱的热负荷进行理论计算,采用数值模拟的方法优化天线舱通风设计,并在实际工作中对天线舱均温性进行试验测试。结果表明,天线舱内部环境温度不超过33.95℃,竖直方向温度梯度最大为7.39℃,人员维修所处区域竖直方向温差小于4℃,均温性满足雷达工作要求。

关键词：相控阵雷达天线舱均温性温度梯度

Dynamic response of ultralight all-metallic sandwich panel with 3D tube cellular core to shallow-buried explosives

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Science China(Technological Sciences) 2021年第7期64卷 1371-1388页

作者： ZHANG DuJiang ZHAO Zhen Yu DU ShaoFeng CHEN WeiJie yang Fan NI ChangYe yang zhikun LU TianJian State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing210016China MIIT Key Laboratory of Multifunctional Lightweight Materials and Structures(MLMS) Nanjing University of Aeronautics and AstronauticsNanjing210016China State Key Laboratory of Smart Manufacturing for Special Vehicles and Transmission System Baotou014030China State Key Laboratory for Strength and Vibration of Mechanical Structures Xi’an Jiaotong UniversityXi’an710049China

The underbody of a vehicle system, either military or civil, is typically made of a relatively thin metallic plate, thus vulnerable to mine blast attacks. To improve the blast resistance, a multitude of protective structures have been proposed as attachments to the thin plate. In the present study, a novel ultralight all-metallic sandwich panel with three-dimensional(3D) tube cellular cores mounted to the vehicle underbody was envisioned as such a protective system. A metallic substrate(mimicking vehicle bottom)was placed above the proposed sandwich panel to construct a sandwich-substrate combinative structure. A series of sandwich panels having 3D tube cellular cores were fabricated via argon protected welding and laser welding. Mechanical responses of the combinative structure subjected to the denotation of 6 kg TNT explosives shallow-buried in dry sand were experimentally measured. Full numerical simulations with the method of finite elements(FE) were subsequently carried out to explore the physical mechanisms underlying the observed dynamic performance and quantify the effects of key geometrical parameters and connection conditions of the protective system. The performance of the proposed sandwich panel under shallow-buried explosives was also compared with competing sandwich constructions having equal mass. Finally, a preliminary optimal design of the 3D tube cellular core was carried out.

关键词： shallow-buried explosive sand blast test 3D tube cellular core sandwich panel numerical simulation

Multi-Strategy Assisted Multi-Objective Whale Optimization Algorithm for Feature Selection

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Computer Modeling in Engineering & Sciences 2024年第8期140卷 1563-1593页

作者： Deng yang Chong Zhou Xuemeng Wei zhikun Chen Zheng Zhang School of Information Engineering Hebei GEO UniversityShijiazhuang050031China Faculty of Science University of AlbertaEdmontonT2N1N4Canada College of Resources and Environment Beibu Gulf UniversityQinzhou535011China Clinical Laboratory The Frist Hospital of Hebei Medical UniversityShijiazhuang050000China

In classification problems,datasets often contain a large amount of features,but not all of them are relevant for accurate *** fact,irrelevant features may even hinder classification *** selection aims to alleviate this issue by minimizing the number of features in the subset while simultaneously minimizing the classification error ***-objective optimization approaches employ an evaluation function designed as an aggregate function with a parameter,but the results obtained depend on the value of the *** eliminate this parameter’s influence,the problem can be reformulated as a multi-objective optimization *** Whale Optimization Algorithm(WOA)is widely used in optimization problems because of its simplicity and easy *** this paper,we propose a multi-strategy assisted multi-objective WOA(MSMOWOA)to address feature *** enhance the algorithm’s search ability,we integrate multiple strategies such as Levy flight,Grey Wolf Optimizer,and adaptive mutation into ***,we utilize an external repository to store non-dominant solution sets and grid technology is used to maintain *** on fourteen University of California Irvine(UCI)datasets demonstrate that our proposed method effectively removes redundant features and improves classification *** source code can be accessed from the website:https://***/zc0315/MSMOWOA.

关键词： Multi-objective optimization whale optimization algorithm multi-strategy feature selection

不同剂量右美托咪定对动脉瘤性蛛网膜下腔出血患者术后认知功能的影响

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中南医学科学杂志 2024年第3期52卷 380-383页

作者：黄志辉樊旭辉费力杨志昆颜玉峰复旦大学附属金山医院神经外科上海201508 青岛市中心医院神经外科山东青岛266000

目的观察不同剂量右美托咪定对动脉瘤性蛛网膜下腔出血患者术后认知功能的影响。方法选取动脉瘤性蛛网膜下腔出血患者90例为研究对象,根据不同治疗方法分为对照组(生理盐水联合瑞芬太尼)、低剂量组(低剂量右美托咪定联合瑞芬太尼)、高... 详细信息

目的观察不同剂量右美托咪定对动脉瘤性蛛网膜下腔出血患者术后认知功能的影响。方法选取动脉瘤性蛛网膜下腔出血患者90例为研究对象,根据不同治疗方法分为对照组(生理盐水联合瑞芬太尼)、低剂量组(低剂量右美托咪定联合瑞芬太尼)、高剂量组(高剂量右美托咪定联合瑞芬太尼),每组30例。采用ELISA法检测各组术前、术后1天血清神经功能指标S100β、神经元特异性烯醇化酶(NSE)和血管内皮功能指标内皮素-1(ET-1)和单核细胞趋化蛋白-1(MCP-1)水平。采用简易智力状态检查量表(MMSE)评估患者术前、术后3天认知功能。比较各组术中不良反应发生情况及术后认知功能障碍(POCD)的发生情况。结果术后3天,各组MMSE评分较术前降低(P低剂量组>对照组(P0.05)。结论右美托咪定能改善动脉瘤性蛛网膜下腔出血患者术后认知功能,降低认知功能障碍的发生,以0.5 g/(kg·h)右美托咪定效果较好。

关键词：右美托咪定动脉瘤蛛网膜下腔出血术后认知功能障碍

Ab Initio Design of Ni-Rich Cathode Material with Assistance of Machine Learning for High Energy Lithium-Ion Batteries

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Energy & Environmental Materials 2024年第6期7卷 74-83页

作者： Xinyu Zhang Daobin Mu Shijie Lu Yuanxing Zhang Yuxiang Zhang Zhuolin yang zhikun Zhao Borong Wu Feng Wu School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081 China

With the widespread use of lithium-ion batteries in electric vehicles,energy storage,and mobile terminals,there is an urgent need to develop cathode materials with specific ***,existing material control synthesis routes based on repetitive experiments are often costly and inefficient,which is unsuitable for the broader application of novel *** development of machine learning and its combination with materials design offers a potential pathway for optimizing ***,we present a design synthesis paradigm for developing high energy Ni-rich cathodes with thermal/kinetic simulation and propose a coupled image-morphology machine learning *** paradigm can accurately predict the reaction conditions required for synthesizing cathode precursors with specific morphologies,helping to shorten the experimental duration and *** the model-guided design synthesis,cathode materials with different morphological characteristics can be obtained,and the best shows a high discharge capacity of 206 mAh g^(−1)at 0.1C and 83%capacity retention after 200 *** work provides guidance for designing cathode materials for lithium-ion batteries,which may point the way to a fast and cost-effective direction for controlling the morphology of all types of particles.

关键词： design digital image lithium-ion batteries machine learning NCM cathode

A data-assisted physics-informed neural network(DA-PINN)for fretting fatigue lifetime prediction

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International Journal of Mechanical System Dynamics 2024年第3期4卷 361-373页

作者： Can Wang Qiqi Xiao zhikun Zhou Yongyu yang Gregor Kosec Lihua Wang Magd Abdel Wahab Soete Laboratory Department of Electrical EnergyMetalsMechanical Constructions and SystemsFaculty of Engineering and ArchitectureGhent UniversityGentBelgium Department of Engineering Mechanics School of Aerospace EngineeringHuazhong University of Science and TechnologyWuhanChina Key Laboratory for Mechanics Anhui Polytechnic UniversityWuhuChina Parallel and Distributed Systems Laboratory Jožef Stefan InstituteLjubljanaSlovenia School of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghaiChina College of Engineering Yuan Ze UniversityTaiwanChina

In this study,we present for the first time the application of physics-informed neural network(PINN)to fretting fatigue *** PINN has recently been applied to pure fatigue lifetime prediction,it has not yet been explored in the case of fretting *** propose a data-assisted PINN(DA-PINN)for predicting fretting fatigue crack initiation *** traditional PINN that solves partial differential equations for specific problems,DA-PINN combines experimental or numerical data with physics equations as part of the loss function to enhance prediction *** DA-PINN method,employed in this study,consists of two main ***,damage parameters are obtained from the finite element method by using critical plane method,which generates a data set used to train an artificial neural network(ANN)for predicting damage parameters in other ***,the predicted damage parameters are combined with the experimental parameters to form the input data set for the DA-PINN models,which predict fretting fatigue *** results demonstrate that DA-PINN outperforms ANN in terms of prediction accuracy and eliminates the need for high computational costs once the damage parameter data set is ***,the choice of loss-function methods in DA-PINN models plays a crucial role in determining its performance.

关键词： crack initiation data-assisted fretting fatigue finite element method physics-informed neural network

山东省禽源产超广谱β-内酰胺酶大肠杆菌的分子流行病学分析

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中国畜牧兽医 2024年第1期51卷 407-416页

作者：宋祥彬赵晓雨李传溥门晓冬梁萌魏秀丽李有志杨志昆张德琛郭玉秋汤文利山东省饲料兽药质量检验中心山东省畜产品质量安全监测与风险评估重点实验室济南250100 山东农业大学动物科技学院泰安271018 山东省蛋鸡技术创新中心济南250102

【目的】分析山东省禽源产超广谱β-内酰胺酶(extended-spectrum β-lactamases, ESBLs)大肠杆菌的耐药情况、耐药机制、毒力基因、多位点序列分型(multilocus sequence typing, MLST)、亲缘性和Inc型质粒,为禽临床合理使用抗菌药物防... 详细信息

【目的】分析山东省禽源产超广谱β-内酰胺酶(extended-spectrum β-lactamases, ESBLs)大肠杆菌的耐药情况、耐药机制、毒力基因、多位点序列分型(multilocus sequence typing, MLST)、亲缘性和Inc型质粒,为禽临床合理使用抗菌药物防治此类细菌病提供参考。【方法】复苏2021年4月-2021年7月分离自山东省禽泄殖腔拭子样本中的38株产ESBLs大肠杆菌,采用微量肉汤稀释法测定其对16种抗菌药物的敏感性,通过全基因组测序检测其携带的耐药基因、毒力基因、MLST、Inc型质粒,使用Parsnp构建菌株系统发育树。【结果】药敏试验结果显示,所有菌株对氨苄西林、头孢噻呋和头孢他啶耐药,对磺胺异噁唑(97.4%)、甲氧苄啶/磺胺甲噁唑(94.7%)、四环素(89.5%)、氟苯尼考(86.8%)、大观霉素(84.2%)耐药严重。全基因组分析结果显示,38株产ESBLs大肠杆菌的blaCTX-M型中blaCTX-M-55基因携带率为34.2%,blaNDM型中blaNDM-5和blaNDM-4基因携带率分别为21.1%和10.5%,其携带大量介导临床中常用抗菌药物的耐药基因和黏附类、侵袭类、血清抗性、铁转运类毒力基因。MLST结果显示,ST10(13.2%)为产ESBLs大肠杆菌最流行的ST型,其次是ST616(10.5%)和ST746(10.5%)。系统发育树分析表明,ST10、ST616和ST746分别属于同一起源。Inc型质粒结果显示,IncFIB(AP001918)携带率最高(68.4%),其次为IncHI2(42.1%)。【结论】山东省禽源产ESBLs大肠杆菌耐药状况严峻,blaCTX-M基因是导致大肠杆菌对超广谱β-内酰胺类抗菌药物耐药的主要原因,且该类菌株携带大量毒力基因,亟需对其加强监测。

关键词：超广谱β-内酰胺酶碳青霉烯禽源大肠杆菌全基因组测序多位点序列分型

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行政检察与行政执法的衔接机制研究

江汉论坛 2022年第8期 123-130页

作者：杨治坤广东外语外贸大学法学院(区域法治研究院) 广东广州510420

在宪制结构中,检察机关的宪法定位及其权力配置直接制约着检察职能的发挥。我国检察机关的职能定位已实现从“一般监督”到“法律监督”的转变,但在法治实践中其却被限缩为“诉讼监督”。这一实践格局严重影响到了检察机关的宪法地位和... 详细信息

在宪制结构中,检察机关的宪法定位及其权力配置直接制约着检察职能的发挥。我国检察机关的职能定位已实现从“一般监督”到“法律监督”的转变,但在法治实践中其却被限缩为“诉讼监督”。这一实践格局严重影响到了检察机关的宪法地位和宪制结构中的权力架构,检察机关的检察职能应当向宪法回归。随着检察制度改革的深入,检察机关的行政检察结构开始分化,逐步从行政诉讼监督向行政执法监督拓展。在此背景下,需要正视行政检察与行政执法衔接机制存在的问题,革新观念,健全行政检察与行政执法衔接工作机制,确立衔接原则,优化具体衔接制度机制,实现行政检察对行政执法的同步、全过程监督,提升依法行政水平,保障国家法治统一。

关键词：宪制结构行政检察行政执法法治统一