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Engine Misfire Fault Detection Based on the Channel Attention Convolutional Model

Computers, Materials & Continua 2025年第1期82卷 843-862页

作者： Feifei Yu Yongxian Huang Guoyan Chen Xiaoqing yang Canyi Du Yongkang Gong School of Mechatronic Engineering Guangdong Polytechnic Normal UniversityGuangzhou510665China School of Automotive and Transportation Engineering Guangdong Polytechnic Normal UniversityGuangzhou510665China

To accurately diagnosemisfire faults in automotive engines,we propose a Channel Attention Convolutional Model,specifically the Squeeze-and-Excitation Networks(SENET),for classifying engine vibration signals and precisely pinpointing misfire *** the experiment,we established a total of 11 distinct states,encompassing the engine’s normal state,single-cylinder misfire faults,and dual-cylinder misfire faults for different *** collection was facilitated by a highly sensitive acceleration signal collector with a high sampling rate of 20,*** collected data were methodically divided into training and testing sets based on different experimental groups to ensure generalization and prevent overlap between the two *** results revealed that,with a vibration acceleration sequence of 1000 time steps(approximately 50 ms)as input,the SENET model achieved a misfire fault detection accuracy of 99.8%.For comparison,we also trained and tested several commonly used models,including Long Short-Term Memory(LSTM),Transformer,and Multi-Scale Residual Networks(MSRESNET),yielding accuracy rates of 84%,79%,and 95%,*** underscores the superior accuracy of the SENET model in detecting engine misfire faults compared to other ***,the F1 scores for each type of recognition in the SENET model surpassed 0.98,outperforming the baseline *** analysis indicated that the misclassified samples in the LSTM and Transformer models’predictions were primarily due to intra-class misidentifications between single-cylinder and dual-cylinder misfire *** delve deeper,we conducted a visual analysis of the features extracted by the LSTM and SENET models using T-distributed Stochastic Neighbor Embedding(T-SNE)*** findings revealed that,in the LSTMmodel,data points of the same type tended to cluster together with significant ***,in the SENET model,data points of various types were more widely and evenly dispersed,demonstra

关键词： Channel attention SENET model engine misfire fault fault detection

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Distribution of glycerol ethers in Turpan soils:implications for use of GDGT-based proxies in hot and dry regions

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Frontiers of Earth Science 2018年第4期12卷 862-876页

作者： Jingjie zang Yanyan LEI Huan yang State Key Laboratory of Biogeology and Environmental Geology School of Earth SciencesChina University of GeoseiencesWuhan 430074China Department of Geology and Environmental Science University of PittsburghPittsburghPA 15260USA

Proxies based on glycerol dialkyl glycerol tetraethers (GDGTs), a suite of membrane lipids occurring ubiquitously in soils, have generated increasing interest in quantitative paleo-environmental reconstruction. Hot and dry climates are likely to have occurred in the geological past; however, the limitations and applicability of these proxies to hot and dry environments are still unknown. In this study, we analyzed the GDGT distribution in the Turpan (TRP) basin of China, where the highest soil temperature can be approximately 70A degrees C, and the mean annual precipitation (MAP) is 15.3 mm. We compared GDGT-based proxies among TRP soils, Nanyang (NY) soils, and Kunming (KM) soils; these three sites exhibit similar mean annual air temperature (MAAT) albeit contrasting temperature seasonality and MAP. Archaeal isoprenoidal GDGTs (isoGDGTs) dominate over bacterial branched GDGTs (brGDGTs) in most TRP soils; this is a characteristic GDGT distribution pattern for soils from dry regions globally. Another feature is the anomalously high GDGT-0/crenarchaeol ratio, which is generally attributed to the contribution of anaerobic methanogenic archaea by previous studies; however, these anaerobic archaea are unlikely to be highly abundant in the dry TRP soils, indicating that certain uncultured halophilic Euryarchaeota are likely to produce a significant amount of GDGT-0 that finally results in a high GDGT-0/Cren ratio. The changes in the salinity of the TRP soils appear to be an important factor affecting the MBT'(5ME) and the relative abundance of 6- vs. 5-methyl pentamethylated brGDGTs (IRIIa'). This is likely to introduce certain scatters in the correlations between MBT'(5ME) and MAAT and that between IRIIa' and pH determined at the global scale. A comparison of the MBT'(5ME)-inferred temperature between TRP, NY, and KM soils does not indicate a significant bias toward summer temperature, indicating that brGDGT paleothermometers in soils could reflect the MAAT.

关键词： GDGTs Turpan soils semi-arid and arid areas salinity MBT5ME'

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Bandgap characteristics analysis and graded design of a novel metamaterial for flexural wave suppression

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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 1-24页

作者： Fan yang Zhaoyang MA Xingming GUO Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Institute of Applied Mathematics and Mechanics School of Mechanics and Engineering ScienceShanghai University Shanghai Institute of Aircraft Mechanics and Control

A novel elastic metamaterial is proposed with the aim of achieving lowfrequency broad bandgaps and bandgap regulation. The band structure of the proposed metamaterial is calculated based on the Floquet-Bloch theorem, and the boundary modes of each bandgap are analyzed to understand the effects of each component of the unit cell on the bandgap formation. It is found that the metamaterials with a low elastic modulus of ligaments can generate flexural wave bandgaps below 300 Hz. Multi-frequency vibrations can be suppressed through the selective manipulation of bandgaps. The dual-graded design of metamaterials that can significantly improve the bandgap width is proposed based on parametric studies. A new way that can regulate the bandgap is revealed by studying the graded elastic modulus in the substrate. The results demonstrate that the nonlinear gradient of the elastic modulus in the substrate offers better bandgap performance. Based on these analyses, the proposed elastic metamaterials can pave the way for multi-frequency vibration control, low-frequency bandgap broadening, and bandgap tuning.

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水电工程造价管理培训的几个问题的思考

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中国三峡建设 2001年第7期8卷 -页

作者：姚元军郭琦杨赞锋李勇中国三峡总公司工程建设部三峡大学湖北宜昌443133

水电工程造价管理是一项实践性很强的工作 ,它要求从业人员除了须具备一定的经济和管理、政策法规方面的知识以外 ,还必须具备一定的工程技术和工艺流程方面的知识。从传统的水电工程造价管理过渡到工程全过程的造价管理 ,是一场历史性... 详细信息

水电工程造价管理是一项实践性很强的工作 ,它要求从业人员除了须具备一定的经济和管理、政策法规方面的知识以外 ,还必须具备一定的工程技术和工艺流程方面的知识。从传统的水电工程造价管理过渡到工程全过程的造价管理 ,是一场历史性的变革 ,它是计划经济向市场经济转变的必然趋势。因此 ,认真做好水电工程造价管理的培训工作 ,培养和造就一批适应市场经济发展的造价管理人才 ,对于促进水电工程造价管理体系的建设 ,提高水电建设队伍的市场竞争能力 ,促进全行业在造价管理方面水平的提高。

关键词：水电工程造价管理培训教师教材

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lncRNA SNHG4 enhanced gastric cancer progression by modulating miR-409-3p/CREB1 axis

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Oncology research 2025年第1期33卷 185-198页

作者： Zhouyang Cheng Yuchen Hua yang Cao Jun Qin Department of General Surgery Affiliated Hospital of Nantong University Nantong 226001 China. Department of Surgery Affiliated Hospital of Nantong University Medical School of Nantong University Nantong 226001 China. Department of Operation Affiliated Hospital of Nantong University Nantong 226001 China.

Objective:Gastric cancer (GC) is a globally common cancer characterized by high incidence and mortality worldwide. Advances in the molecular understanding of GC provide promising targets for GC diagnosis and therapy. Long non-coding RNAs (lncRNAs) and their downstream regulators are regarded to be implicated in the progression of multiple types of malignancies. Studies have shown that the lncRNA small nucleolar RNA host gene 4 (SNHG4) serves as a tumor promoter in various malignancies, while its function in GC has yet to be characterized. Therefore, our study aimed to explore the role and underlying mechanism of SNHG4 in GC.Methods:We used qRT-PCR to analyze SNHG4 expression in GC tissues and cells. Kaplan-Meier analysis was used to assess the correlation between SNHG4 expression and the survival rate of GC patients. Cellular function experiments such as CCK-8, BrdU, colony formation, flow cytometry analysis, and transwell were performed to explore the effects of SNHG4 on GC cell proliferation, apoptosis, cell cycle, migration, and invasion. We also established xenograft mouse models to explore the effect of SNHG4 on GC tumor growth. Mechanically, dual luciferase reporter assay was used to verify the interaction between SNHG4 and miR-409-3p and between miR-409-3p and cAMP responsive element binding protein 1 (CREB1).Results:The results indicated that SNHG4 was overexpressed in GC tissues and cell lines, and was linked with poor survival rate of GC patients. SNHG4 promoted GC cell proliferation, migration, and invasion while inhibiting cell apoptosis and cell cycle arrest . The experiment indicated that SNHG4 facilitated GC tumor growth. Furthermore, SNHG4 was demonstrated to bind to miR-409-3p. Moreover, CREB1 was directly targeted by miR-409-3p. Rescue assays demonstrated that miR-409-3p deficiency reversed the suppressive impact of SNHG4 knockdown on GC cell malignancy. Additionally, miR-409-3p was also revealed to inhibit GC cell proliferation, migration, and

关键词： Gastric cancer MicroRNA-409-3p (miR-409-3p) Small nucleolar RNA host gene 4 (SNHG4) cAMP responsive element binding protein 1 (CREB1)

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输尿管软镜碎石术后脓毒血症风险评分系统的初步建立

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中国现代医学杂志 2019年第15期29卷 72-76页

作者：臧海洋王勤章倪钊钱彪石河子大学医学院第一附属医院

目的通过术前危险因素建立一个术前风险评分系统,预测输尿管软镜碎石术后脓毒血症发生的风险。方法选取2015年1月-2018年6月石河子大学第一附属医院泌尿外科行输尿管软镜碎石术患者的临床资料,根据输尿管软镜碎石术后脓毒血症危险因素M... 详细信息

目的通过术前危险因素建立一个术前风险评分系统,预测输尿管软镜碎石术后脓毒血症发生的风险。方法选取2015年1月-2018年6月石河子大学第一附属医院泌尿外科行输尿管软镜碎石术患者的临床资料,根据输尿管软镜碎石术后脓毒血症危险因素Meta分析结果,以女性、糖尿病、术前尿培养阳性、结石直径>1 cm、既往结石手术史5个因素关联强度不同进行赋值,初步建立输尿管软镜术后脓毒血症风险评分系统(FURSS),运用受试者操作特征(ROC)曲线对该评分系统的判别性及敏感性进行验证,并根据约登指数进行危险度分组。结果女性、糖尿病、术前尿培养阳性、结石直径>1cm、既往结石手术史5个因素赋值分别为2、2、3、2、2,ROC曲线下面积为0.827(95%CI:0.708,0.947,P=0.000),当评分<4.5分时,敏感性为84.6%、特异性为85.8%。结论该研究所建立的FURSS对输尿管软镜术后发生脓毒血症有良好预测价值,当评分<4.5分时患者术后脓毒血症风险较高。

关键词：脓毒症输尿管镜危险因素风险评分

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Gold-Hydrogen Nanoclusters:Atom-Precise Model to Unveil Catalytic Mechanism and Growth Process of Gold Nanoparticles

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Chinese Journal of Chemistry 2020年第6期38卷 663-664页

作者： Zhao-yang Wang Shuang-Quan zang College of Chemistry Zhengzhou UniversityZhengzhouHenan 450001China

Gold nanoclusters show high catalytic performance in various chemical reactions including the hydrogenation and hydrogen evolution *** involved gold clusters is the ideal model to investigate the hydrogen-gold cluster interactions,the influence of H atoms on the electronic structures of the gold clusters,the particle growth process,and the catalytic *** paper highlights the pioneering experimental and theoretical works in the gold-hydrogen cluster studies,and overviews the existing challenges.

关键词： mechanism. clusters cluster

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Effect of yttrium addition on microstructure, mechanical and corrosion properties of 20Cr13 martensitic stainless steel

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Journal of Iron and Steel Research International 2020年第4期27卷 451-460页

作者： Qi-yu zang yang-fan Jin Tuo Zhang Yi-tao yang School of Materials Science and Engineering Shanghai UniversityShanghai 200444China

The effects of rare-earth yttrium(Y)element on the microstructure,mechanical properties and corrosion properties of 20Cr13 martensitic stainless steel were investigated by optical microscopy,scanning electron microscopy and tensile *** experiments were carried out to study the effect of rare-earth element Y addition on corrosion *** results showed that the addition of 0.02 wt.%rare-earth yttrium to martensitic stainless steel could affect the microstructure transformation,and Ac3 temperature was obviously *** the stainless steel after heat treatment,there were more pro-eutectoid ferrite in the steel with 0.02 wt.%*** mechanical test results showed that the addition of 0.02 wt.%yttrium could significantly improve the tensile strength and elongation of the steel,which was related to the influence of yttrium element on inclusions in the test *** the quenching temperature of 0.02 wt.%yttrium steel increasing,the content of the ferrite in steel was affected and the corrosion resistance was remarkably improved.

关键词： Yttrium Martensitic stainless steel Mechanical property Microstructural characterization Corrosion

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不同脂肪源对异育银鲫鱼种生长、消化率及体成分的影响

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水产学报 2010年第9期34卷 1439-1446页

作者：王煜恒王爱民刘文斌於叶兵韩光明臧旸南京农业大学动物科技学院盐城工学院海洋技术系江苏省沿海池塘养殖生态重点实验室

为了探讨不同脂肪源对异育银鲫生长、消化率和体成分的影响,在基础饲料中分别添加4%的鱼油、豆油、猪油、花生油和混合油(鱼油∶豆油∶猪油=3∶4∶3)制成5种等氮试验饲料,饲喂均重为(6.04±0.05)g的异育银鲫60d。结果表明,混合油组的增... 详细信息

为了探讨不同脂肪源对异育银鲫生长、消化率和体成分的影响,在基础饲料中分别添加4%的鱼油、豆油、猪油、花生油和混合油(鱼油∶豆油∶猪油=3∶4∶3)制成5种等氮试验饲料,饲喂均重为(6.04±0.05)g的异育银鲫60d。结果表明,混合油组的增重率、特定生长率(SGR)显著高于鱼油组和猪油组(P0.05);蛋白质效率(PER)、饲料系数(FCR)各组间均无显著性差异(P>0.05);豆油组的肠体比显著高于鱼油组和猪油组(P0.05);鱼体肌肉中水分、粗蛋白、粗脂肪、粗灰分和磷各组间差异不显著(P>0.05);猪油组肝脏中粗脂肪含量显著高于鱼油组和花生油组(P<0.05);肝脏中粗蛋白鱼油组和豆油组显著高于猪油组和花生油组(P<0.05);猪油组粗蛋白和粗脂肪的表观消化率显著低于其他各组(P<0.05)。研究结果显示,当豆油和花生油单独添加时,与添加鱼油组表现出相似的生长性能、表观消化率和体成分,而单独添加猪油,鱼体对营养物质的消化率不如其他油脂。建议生产上鱼油、豆油和猪油混合添加,使得油脂中各种脂肪酸的比例适中,不但节约了饲料成本,而且异育银鲫表现出较好的生长效果。

关键词：异育银鲫脂肪源生长表观消化率体成分

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Tandem Strip Mill's Multi-parameter Coupling Dynamic Modeling Based on the Thickness Control

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Chinese Journal of Mechanical Engineering 2015年第2期28卷 353-362页

作者： PENG Yan ZHANG yang SUN Jianliang zang Yong National Engineering Research Center for Equipment and Technology of Cold Rolling Strip Yanshan University School of Mechanical Engineering University of Science and Technology Beijing

The rolling process is determined by the interaction of a number of different movements,during which the relative movement occurs between the vibrating roll system and the rolled piece,and the roll system＇s vibration interacts with the strip＇s deformation and rigid *** many parameters being involved leads to a complex mechanism of this coupling *** testing and analyzing the vibration signals of the mill in the rolling process,the rolling mill＇s coupled model is established with comprehensive consideration of the coupling interaction between the mill＇s vertical vibration,its torsional vibration and the working roll＇s horizontal vibration,and vibration characteristics of different forms of rolling mill＇s vibration are analyzed under the coupling *** comprehensive attention to the relationship between the roll system,the moving strip and the rolling parameters＇dynamic properties,and also from the strip thickness control point of view,further research is done on the coupling mechanism between the roll system＇s movement and the moving strip＇s characteristics in the rolling *** a result,the law of inertial coupling and the stiffness coupling effect caused by different forms of the roll system＇s vibration is determined and the existence of nonlinear characteristics caused by the elastic deformation of moving strip is also ***,a multi-parameter coupling-dynamic model is established which takes the tandem strip mill as its research object by making a detailed kinematics analysis of the roll system and using the principle of virtual *** coupling-dynamic model proposes the instruction to describe the roll system＇s movement,and analyzes its dynamic response and working stability,and provides a theoretical basis for the realization of the strip thickness＇dynamic control.

关键词： tandem strip mill dynamic characteristics moving strip roll system

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