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Diesel Engine Valve Clearance Fault Diagnosis Based on Features Extraction Techniques and FastICA-SVM

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Chinese Journal of Mechanical Engineering 2017年第4期30卷 991-1007页

作者： Ya-bing Jing Chang-Wen Liu feng-rong bi Xiao-Yang bi Xia Wang Kang Shao State Key Laboratory of Engines Tianjin UniversityTianjin 300072 China School of Mechanical Engineering Tianjin UniversityTianjin 300072 China Internal Combustion Engine Research Institute Tianjin University Tianjin 300072 China

Numerous vibration-based techniques are rarely used in diesel engines fault diagnosis in a direct way, due to the surface vibration signals of diesel engines with the complex non-stationary and nonlinear time-varying fea- tures. To investigate the fault diagnosis of diesel engines, fractal correlation dimension, wavelet energy and entropy as features reflecting the diesel engine fault fractal and energy characteristics are extracted from the decomposed signals through analyzing vibration acceleration signals derived from the cylinder head in seven different states of valve train. An intelligent fault detector FastICA-SVM is applied for diesel engine fault diagnosis and classification. The results demonstrate that FastlCA-SVM achieves higher classification accuracy and makes better general- ization performance in small samples recognition. Besides, the fractal correlation dimension and wavelet energy and entropy as the special features of diesel engine vibration signal are considered as input vectors of classifier FastlCA- SVM and could produce the excellent classification results. The proposed methodology improves the accuracy of fea- ture extraction and the fault diagnosis of diesel engines.

关键词： Feature extraction Diesel engine valve train FastlCA PCA Support vector machine

Characteristics of catalytic destruction of dichloromethane and ethyl acetate mixture over HxPO4-RuOx/CeO2 catalyst

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Journal of Environmental Sciences 2025年第2期148卷 336-349页

作者： Jiawen Chen Qingjie Meng feng bi Jingkun Chen Xiaole Weng Zhongbiao Wu Key Laboratory of Environment Remediation and Ecological Health Ministry of EducationCollege of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China School of Civil&Environmental Engineering and Geography Science Ningbo UniversityNingbo 315211China ZJU-Hangzhou Global Scientific and Technological Innovation Center Hangzhou 311200China Zhejiang Provincial Engineering Research Centre of Industrial Boiler&Furnace Flue Gas Pollution Control Hangzhou 310058China

Catalytic destruction is an ascendant technology for the abatement of volatile organic compounds(VOCs)originating fromsolvent-based industrial *** varied composition tends to influence each VOC’s catalytic behavior in the reaction *** investigated the catalytic destruction of multi-component VOCs including dichloromethane(DCM)and ethyl acetate(EA),as representatives from pharmaceutical waste gases,over co-supported HxPO_(4)-RuOx/CeO_(2) catalyst.A mutual inhibitory effect relating to concentrations because of competitive adsorption was verified in the binary VOCs oxidation and EA posed a more negative effect on DCM oxidation owing to EA’s superior adsorption *** adsorption of EA on acidic sites(HxPO_(4)/CeO_(2))promoted DCM activation on basic sites(O^(2−))and the dominating EA oxidation blocked DCM’s access to oxidation centers(RuOx/CeO_(2)),resulting in boosted monochloromethane yield and increased chlorine deposition for DCM *** impaired redox ability of Ru species owing to chlorine deposition in turn jeopardized deep oxidation of EA and its by-products,leading to increased gaseous by-products such as acetic acid originating fromEA ***,DCM at low concentration slightly promoted EA conversion at low temperatures with or without water,consistent with the enhanced EA adsorption in co-adsorption *** was mainly due to that DCM impeded the shielding effect of hydrolysate deposition from rapid EA hydrolysis depending on the decreased ***,water benefited EA hydrolysis but decreased CO_(2) selectivity while the generated water derived from EA was likely to affect DCM *** work may provide theoretical guidance for the promotion of applied catalysts toward industrial applications.

关键词： Catalytic destruction Multi-component VOCs Mixture effect Interaction mechanism

Disease prediction by network information gain on a single sample basis

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Fundamental Research 2025年第1期5卷 215-227页

作者： Yan, Jinling Li, Peiluan Li, Ying Gao, rong bi, Cheng Chen, Luonan School of Mathematics and Statistics Henan University of Science and Technology Luoyang 471023 China Key Laboratory of Information Fusion Technology of Ministry of Education School of Automation Northwestern Polytechnical University Xi'an 710072 China Longmen Laboratory Henan Luoyang 471003 China Key Laboratory of Systems biology Center for Excellence in Molecular Cell Science Shanghai Institute of Biochemistry and Cell Biology Chinese Academy of Sciences Shanghai 200031 China Key Laboratory of Systems Health Science of Zhejiang Province Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Chinese Academy of Sciences Hangzhou 310024 China Guangdong Institute of Intelligence Science and Technology Guangdong Hengqin Zhuhai 519031 China School of Life Science and Technology ShanghaiTech University Shanghai 201210 China

There are critical transition phenomena during the progression of many diseases. Such critical transitions are usually accompanied by catastrophic disease deterioration, and their prediction is of significant importance for disease prevention and treatment. However, predicting disease deterioration solely based on a single sample is a difficult problem. In this study, we presented the network information gain (NIG) method, for predicting the critical transitions or disease state based on network flow entropy (NFE) from omics data of each individual. NIG can not only efficiently predict disease deteriorations but also detect their dynamic network biomarkers (DNBs) on an individual basis and further identify potential therapeutic targets. The numerical simulation demonstrates the effectiveness of NIG. Moreover, our method was validated by successfully predicting disease deteriorations and identifying their potential therapeutic targets from four real omics datasets, i.e., an influenza dataset and three cancer datasets. © 2023

关键词： Disease prediction Drug target Dynamic network biomarker Network flow entropy Network information gain Tipping point

Modular assembly of Co4-thiacalix[4]arene units and Keggin-type SiW12O40 for visible-light photothermal conversion

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Tungsten 2025年第1期7卷 112-119页

作者： Jia-Hui Li Qing Zhao Dong-Ao Mao Kun Zhou Bao-Kuan Chen Yan-feng bi School of Petrochemical Engineering Liaoning Petrochemical University

The construction of metal-organic coordination clusters（MCCs） using modular secondary building units is an important method for preparing functional *** this study,two new MCCs modularly assembled from Keggin-type {SiW12O40}H4TC4A=p-tert-Butylthiacalix[4]arene(SiW12) units and thiacalixarene-supported Co4-thiacalix[4]arene(Co4-TC4A polynuclear second-building units（PSBUs,H4TC4A=p-tert-Butylthiacalix[4]arene） are *** two MCCs,abbreviated as Co4-SiW12and Co8-SiW12,were structurally characterized by single-crystal X-ray *** Co4-SiW12is a supramolecular structure involving cation-anion interactions between Co4-TC4A PSBUs and ***8-SiW12features "barbell-like" shapes with two Co4-TC4A coordinatively linked to a Keggin-type SiW12unit on opposite via W-O_t-Co *** coordination of Co4-TC4A to SiW12in Co8-SiW12resulted in significantly improved photothermal conversion performances compared with Co4-SiW12and pure SiW12or ***-gap determination and photophysical analysis combined with density functional theory calculations indicated the binding mode between Co4-TC4A PSBUs and SiW12,which considerably influences the way of electron transport and the conversion ability of visible light to heat.

关键词： Modular construction Photothermal conversion Polyoxometalate Thiacalixarene

Accurate visualization colorectal cancer by monitoring viscosity variations with a novel mitochondria-targeted fluorescent probe

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Chinese Chemical Letters 2025年第2期36卷 319-322页

作者： Fan Zheng Runsha Xiao Shuai Huang Zhikang Chen Chen Lai Anyao bi Heying Yao Xueping feng Zihua Chen Wenbin Zeng Xiangya School of Pharmaceutical Sciences Central South University Hunan Key Laboratory of Diagnostic and Therapeutic Drug Research for Chronic Diseases Central South University Department of General Surgery Xiangya Hospital Central South University Hunan Key Laboratory of Precise Diagnosis and Treatment of Gastrointestinal Tumor Xiangya Hospital Central South University National Clinical Research Center for Geriatric Disorders Xiangya Hospital Central South University Department of Oncology Xiangya Hospital Central South University Department of Otolaryngology-head and Neck Surgery and Institute of Medical Sciences Xiangya Hospital Central South University

Colorectal cancer(CRC) is one of the most prevalent malignant tumors worldwide, exhibiting high morbidity and mortality. Lack of efficient tools for early diagnosis and surgical resection guidance of CRC have been a serious threat to the long-term survival rate of the CRC patients. Recent studies have shown that relative higher viscosity was presented in tumor cells compared to that in normal cells, leading to viscosity as a potential biomarker for CRC. Herein, we reported the development of a series of novel viscosity-sensitive and mitochondria-specific fluorescent probes(HTB, HTI, and HTP) for CRC *** them, HTB showed high sensitivity, minimal background interference, low cytotoxicity, and significant viscous response capability, making it an ideal tool for distinguishing colorectal tumor cells from normal cells. Importantly, we have successfully utilized HTB to visualize in a CRC-cells-derived xenograft(CDX) model, enriching its medical imaging capacity, which laid a foundation for further clinical translational application.

关键词： bioimaging Cancer diagnosis Colorectal cancer Fluorescent probe Mitochondrial-targeted Viscosity

β_2受体激动剂与抗胆碱能药物治疗慢性阻塞性肺疾病的疗效观察

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临床合理用药杂志 2015年第26期8卷 1-2页

作者：冯碧容南充卫生学校附属医院四川省南充市637000

目的探讨β2受体激动剂与抗胆碱能药物治疗慢性阻塞性肺疾病（COPD）的临床效果。方法选取2014年2～9月收治的COPD患者76例。随机分为观察组与对照组各38例。对照组采用常规方法治疗,观察组采用β2受体激动剂与抗胆碱能药物治疗,比较2... 详细信息

目的探讨β2受体激动剂与抗胆碱能药物治疗慢性阻塞性肺疾病（COPD）的临床效果。方法选取2014年2～9月收治的COPD患者76例。随机分为观察组与对照组各38例。对照组采用常规方法治疗,观察组采用β2受体激动剂与抗胆碱能药物治疗,比较2组临床疗效。结果观察组FVC、FEV1及FEV1/FVC指标均明显高于对照组,差异有统计学意义（P〈0.05）。对照组总有效率71.05%明显低于观察组的94.74%,差异有统计学意义（P〈0.05）。结论β2受体激动剂与抗胆碱能药物治疗COPD可有效缓解患者临床症状,促进肺功能恢复,提高临床效果,改善患者生存质量,值得临床推广应用。

关键词： COPD β2受体激动剂抗胆碱能药物

奥美拉唑与西沙比利联合治疗反流性食道炎的临床观察

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临床合理用药杂志 2016年第8期9卷 5-6页

作者：冯碧容南充卫生学校附属医院内科四川省南充市637000

目的探讨探索奥美拉唑西沙比利与治疗反流性食道炎的临床效果。方法选取2014年2月-2015年8月医院反流性食道炎患者81例。随机分为单用药组40例和联合用药组41例。单用药组仅予奥美拉唑治疗;联合用药组予奥美拉唑与西沙比利联合治疗。比... 详细信息

目的探讨探索奥美拉唑西沙比利与治疗反流性食道炎的临床效果。方法选取2014年2月-2015年8月医院反流性食道炎患者81例。随机分为单用药组40例和联合用药组41例。单用药组仅予奥美拉唑治疗;联合用药组予奥美拉唑与西沙比利联合治疗。比较2组总有效率,不良反应发生率及患者胃黏膜充血消退时间、溃疡愈合时间。结果联合用药组总有效率95.12%明显高于单用药组的75.00%,差异有统计学意义(P<0.05)。联合用药组的胃黏膜充血消退时间、溃疡愈合时间明显较单用药组短,差异有统计学意义(P<0.05)。2组均未出现明显不良反应,2组比较差异有统计学意义(P<0.05)。结论奥美拉唑与西沙比利联合治疗反流性食道炎的临床效果确切,可有效促进临床症状消退,安全性高,值得推广。

关键词：奥美拉唑西沙比利反流性食道炎

Emission characteristics and probabilistic health risk of volatile organic compounds from leather sofa

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Journal of Environmental Sciences 2025年第2期148卷 79-87页

作者： Chuanhui Mu Yuling Tang Zhaohui Yang Jianfei Zhou bi Shi National Engineering Laboratory for Clean Technology of Leather Manufacture Sichuan UniversityChengdu 610065China Research Institute of Leather and Footwear Industry of Wenzhou Wenzhou 325088China Key Laboratory of Leather Chemistry and Engineering of Ministry of Education Sichuan UniversityChengdu 610065China

Furniture is identified as a vital volatile organic compound(VOC)emission source in the indoor *** has become the most common raw and auxiliary fabric material for upholstered furniture,particularly with extensive consumption in sofas,due to its abundant resources and efficient *** being widely traded across the world,little research has been conducted on the VOCs released by leathermaterials and their health risk assessment in the indoor ***,this study investigated the VOC emissions of leather with different grades and the health risk of the inhalation *** on the ultra-fast gas phase electronic nose(EN)and GC-FID/Qtof,the substantial emissions of aliphatic aldehyde ketones(Aks),particularly hexanal,appear to be the cause of off-flavor in medium and low grade(MG and LG)sofa *** health risk assessment indicated that leather materials barely pose non-carcinogenic and carcinogenic effects to *** the abundance of VOC sources and the accumulation of health risks in the indoor environment,more stringent specifications concerning qualitative and quantitative content should be extended to provide VOC treatment basic for the manufacturing industry and obtain better indoor air quality.

关键词： Indoor environment Leather Volatile organic compounds(VOCs) Health risk assessment

空调与制冷用高频焊接内螺纹铜管焊缝微观特性的研究

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热加工工艺 2007年第23期36卷 27-29页

作者：胡瑞玲冯必容刘景平湖北汽车工业学院材料工程系湖北十堰442002 东风汽车有限公司销售部湖北十堰442002 广东大华仁盛科技有限公司广东广州510540

通过对空调与制冷用高频焊接内螺纹铜管焊缝微观组织特性的研究,找出了焊管质量问题的存在方式及其产生原因,提出了改进方法并加以实现,最终解决了生产中存在的问题,使产品质量得到了稳定。

关键词：高频焊接内螺纹铜管微观特性