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Research on Defect Detection ofWind Turbine Blades Based onMorphology and Improved Otsu Algorithm Using Infrared Images

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Computers, Materials and Continua 2024年第1期81卷 933-949页

作者： Kang s. He Y. Li W. liu s. school of Mechanical and Control Engineering Baicheng Normal University Baicheng 137000 China school of Information and Control Engineering Jilin Institute of Chemical Technology Jilin 132022 China

To address the issues of low accuracy and high false positive rate in traditional Otsu algorithm for defect detection on infrared images of wind turbine blades (WTB), this paper proposes a technique that combines morphological image enhancement with an improved Otsu algorithm. First, mathematical morphology's differential multi-scale white and black top-hat operations are applied to enhance the image. The algorithm employs entropy as the objective function to guide the iteration process of image enhancement, selecting appropriate structural element scales to execute differential multi-scale white and black top-hat transformations, effectively enhancing the detail features of defect regions and improving the contrast between defects and background. Afterwards, grayscale inversion is performed on the enhanced infrared defect image to better adapt to the improved Otsu algorithm. Finally, by introducing a parameter K to adjust the calculation of inter-class variance in theOtsumethod, theweight of the target pixels is increased. Combined with the adaptive iterative threshold algorithm, the threshold selection process is further fine-tuned. Experimental results show that compared to traditional Otsu algorithms and other improvements, the proposed method has significant advantages in terms of defect detection accuracy and reducing false positive rates. The average defect detection rate approaches 1, and the average Hausdorff distance decreases to 0.825, indicating strong robustness and accuracy of the method. © 2024 The Authors.

关键词： adaptive iterative thresholding grayscale inversion improved Otsu algorithm infrared image Morphological enhancement

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Perfluorinated iodine alkanes promote the differentiation of mouse embryonic stem cells by regulating estrogen receptor signaling

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Journal of Environmental sciences 2024年第3期137卷 443-454页

作者： Zhihua Ren Xiaoxi Yang Tingting Ku Qian s.liu Jiefeng Liang Qunfang Zhou Francesco Faiola Guibin Jiang state Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China College of Environment and Resource Research Center of Environment and HealthShanxi UniversityTaiyuan 030006China College of sino-Danish University of Chinese Academy of SciencesBeijing 100049China

Investigating the development toxicity of perfuorinated iodine alkanes(PFIs)is critical,given their estrogenic effects through binding with estrogen receptors(ERs).In the present study,two PFIs,including dodecafuoro-1,6-diiodohexane(PFHx DI)and tridecafuorohexyl iodide(PFHx I),with binding preference to ERαand ERβ,respectively,were selected to evaluate their effects on proliferation and differentiation of the mouse embryonic stem cells(m EsCs).The results revealed that,similar to E_(2),50μmol/L PFHx DI accelerated the cell proliferation of the m *** PFI stimulation at the exposure concentrations of 2–50μmol/L promoted the differentiation of the m EsCs as characterized by the upregulation of differentiation-related biomarkers(i.e.,Otx2 and Dnmt3β)and downregulation of pluripotency genes(i.e.,Oct4,Nanog,sox2,Prdm14 and Rex1).Comparatively,PFHx DI exhibited higher induction effect on the differentiation of the m EsCs than did PFHx *** tests on ER signaling indicated that both PFI compounds induced exposure concentration-dependent expressions of ER signaling-related biomarkers(i.e.,ERα,ERβand Caveolin-1)in the m EsCs,and the downstream ER responsive genes(i.e.,c-fos,c-myc and c-jun)well responded to PFHx I *** role of ER in PFI-induced effects on the m EsCs was further validated by the antagonistic experiments using an ER inhibitor(ICI).The findings demonstrated that PFIs triggered ER signaling,and perturbed the differentiation program of the m EsCs,causing the potential health risk during early stage of development.

关键词： Perfuorinated iodine alkanes(PFIs) Embryonic stem cells(EsCs) Developmental toxicity Cell differentiation Estrogen receptor-related signaling

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Cognition on oxidation behavior of Ni-based superalloy GH4742 when exposed to water vapor

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Journal of Materials science & Technology 2024年第7期174卷 15-22页

作者： H.Xu s.F.Yang E.H.Wang C.Y.Guo Y.s.liu X.M.Hou Y.L.Zhang state Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China

The oxidation behavior of Ni-based superalloy GH4742 exposed to water vapor was investigated at 900-1100℃for 50 h in Ar+20%H_(2)O,with Ar+20%O_(2)included for *** presence of H_(2)O is adverse to formation of continuous Cr_(2)O_(3)oxide layer but contributes to generation of big *** on this,Ni^(2+)and Co^(2+)are more easily to diffuse towards the outermost oxide layer(OOL),forming non-protective Ni-and Co-rich oxides with high *** leads to a higher weight gain in Ar+20%H_(2)O than that in Ar+20%O_(2).At elevated temperatures,the spallation of oxide scale occurs while the consumption of Cr is reduced in Ar+20%H_(2)O,and the contents of Ni-and Co-rich oxides at this moment are reduced in the *** oxidation mechanism was also discussed.

关键词： GH4742 superalloy H_(2)O Diffusion Oxidation Mechanism

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Environmental Obesogens and Their Perturbations in Lipid Metabolism

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Environment & Health 2024年第5期2卷 253-268页

作者： Xiaoyun Wang Zhendong sun Qian s.liu Qunfang Zhou Guibin Jiang state Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China school of Environment Hangzhou Institute for Advanced StudyUCASHangzhou 310024China

Epidemiological data show that obesity is now a *** homeostasis requires the coordination of multiple tissues and organs,including the liver,kidney,cardiovascular system,and adipose tissues,to maintain bodily *** increasing amounts of chemicals are being synthesized,applied,and released into the environment,their obesogenic effects have triggered serious ***,more than 50 types of chemicals with high human exposure levels have been identified as environmental obesogens that can interfere with lipid metabolism and induce *** studies have shown that the lipid metabolism interference effects of obesogens have multiple targets,including nuclear receptors,transcription factors,cytokines,and *** interfering factors of environmental obesogeninduced obesity include transgenerational effects,susceptibility windows,gender differences,structure−effect relationships,and diet *** research approaches have been established to conduct obesogenic effect *** comprehensive review summarizes the mechanisms underlying obesogen actions and the research progress on obesogen-disrupted lipid metabolism,along with the influencing factors and research approaches,aiming to provide a framework for understanding the effects of environmental obesogens on lipid metabolism.

关键词： environmental obesogens lipid metabolism risk assessment influencing factors research approaches

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Cost burden following esophagectomy:A single centre observational study

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World Journal of Gastrointestinal surgery 2024年第7期16卷 2255-2269页

作者： Vered Buchholz Dong Kyu Lee David s liu Ahmad Aly stephen A Barnett Riley Hazard Peter Le Benjamin Kioussis Vijayaragavan Muralidharan Laurence Weinberg Department of surgery Austin HealthMelbourne 3084VictoriaAustralia Department of Anesthesiology and Pain Medicine Dongguk University Ilsan HospitalSeoul 14566GoyangSouth Korea Department of surgery Austin HealthThe University of MelbourneMelbourne 3084VictoriaAustralia Department of Anesthesia Austin HealthMelbourne 3084VictoriaAustralia Department of Anesthesia Austin HospitalHeidelberg 3084VictoriaAustralia Department of Critical Care The University of MelbourneMelbourne 3084VictoriaAustralia

BACKGROUND Cost analyses of patients undergoing esophagectomy is valuable for identifying modifiable expenditure drivers to target and curtail costs while improving the quality of *** aimed to define the cost-complication relationship after esophagectomy and delineate the incremental contributions to *** To assess the relationship between the hospital costs and potential cost drivers post esophagectomy and investigate the relationship between the cost-driving variables(predicting variables)and hospital costs(dependent variable).METHODs In this retrospective single center study,the severity of complications was graded using the Clavien-Dindo(CD)classification *** esophagectomy complications were categorized and defined according to consensus *** costing data included the in-hospital costs of the index admission and any unplanned admission within 30 postoperative *** used correlation analysis to assess the relationship between key clinical variables and hospital costs(in United states dollars)to identify cost drivers.A mediation model was used to investigate the relationship between these variables and hospital *** A total of 110 patients underwent primary esophageal *** median admission cost was $47822.7(interquartile range:35670.2-68214.0).The total effects on costs were $13593.9(95%CI:10187.1-17000.8,Pse in CD severity grade,$4781(95%CI:3772.7-5789.3,Pse in the number of complications,and $42552.2(95%CI:8309-76795.4,P=0.015)if a key esophagectomy complication *** esophagectomy complications drove the costs directly by $11415.7(95%CI:992.5-21838.9,P=0.032).CONCLUsION The severity and number of complications,and the development of key esophagectomy complications significantly contributed to total hospital *** institutional initiatives and strategies are needed to enhance patient outcomes and minimize costs.

关键词： Anesthesia Esophagectomy Complications Cancer surgery

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合成酚类化合物的脂代谢干扰效应与致肥胖作用

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色谱 2024年第2期42卷 131-141页

作者：刘惠楠孙振东刘倩周群芳江桂斌中国科学院生态环境研究中心环境化学与生态毒理学国家重点实验室北京100085 中国科学院大学资源与环境学院北京100049 国科大杭州高等研究院环境学院浙江杭州310024

随着社会经济的不断发展,肥胖已经成为一种不可忽视的全球性流行疾病。除了受到遗传和饮食因素的影响外,肥胖的形成与发展也与环境中的化学物质暴露有关。研究发现一些具有内分泌干扰活性的化学物质可以影响机体脂代谢,如促进脂肪细胞... 详细信息

随着社会经济的不断发展,肥胖已经成为一种不可忽视的全球性流行疾病。除了受到遗传和饮食因素的影响外,肥胖的形成与发展也与环境中的化学物质暴露有关。研究发现一些具有内分泌干扰活性的化学物质可以影响机体脂代谢,如促进脂肪细胞形成、引起体内脂质累积增加等,这类物质被称为“环境致肥胖物质”。合成酚类化合物广泛用于工业生产和日常生活用品中,如塑料制品、消毒剂、杀虫剂和食品添加剂等,它们可通过饮食、饮水或皮肤接触等方式进入人体,是影响人体健康的潜在威胁。研究显示,合成酚类化合物具有内分泌干扰效应,可以影响脂肪生成过程、干扰脂代谢,具有致肥胖作用。由于这类物质都具有类似的苯酚结构,因此系统梳理这类化合物脂代谢干扰效应与致肥胖作用,有助于理解其构效关系与潜在健康风险。本文阐述了筛选环境致肥胖物质的3种常用研究模型,即体外分子互作研究模型、细胞成脂分化模型和动物脂代谢实验模型,并比较了各种模型的适用场景和优缺点。在此基础上,针对3种合成酚类化合物,即双酚A及其类似物、烷基酚和酚类抗氧化剂,结合其体外细胞与动物实验数据,对这些化合物的暴露现状和脂代谢干扰效应进行了分类描述,从它们对脂肪生成和代谢、肝组织脂代谢的影响等方面展开讨论。基于近年来脂代谢和致肥胖效应的相关研究,本文归纳总结了环境内分泌干扰物干扰脂代谢的内在毒理机制,主要包括核受体调控作用、炎症和氧化应激、肠道微环境、表观遗传和其他信号通路。最后本文指出了当前针对环境污染物,特别是新污染物,影响机体脂代谢引起肥胖效应研究中的不足,并对该领域研究进行了展望。

关键词：合成酚类化合物肥胖环境致肥胖物质脂代谢综述

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基于程函方程的多震相走时地震定位方法

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中国科学：地球科学 2024年第6期54卷 1830-1844页

作者：劳高月杨顶辉刘少林董桂菊汪文帅刘魁应急管理部国家自然灾害防治研究院北京100085 云南大学地球科学学院昆明650091 清华大学数学科学系北京100084 宁夏大学信息工程学院银川750021

震源位置的精确测定是地震学研究的基础,是地震活动性分析和地震层析成像研究的关键.在实际地震定位中,常使用初至波走时定位,但初至波走时往往对震源深度敏感程度低.为了提高定位精度,研究者利用深度震相走时对震源深度敏感的特点,开... 详细信息

震源位置的精确测定是地震学研究的基础,是地震活动性分析和地震层析成像研究的关键.在实际地震定位中,常使用初至波走时定位,但初至波走时往往对震源深度敏感程度低.为了提高定位精度,研究者利用深度震相走时对震源深度敏感的特点,开展初至波和深度震相走时联合地震定位研究.虽然联合定位能一定程度提高定位精度,但研究者常在层状模型中开展联合定位,由于层状模型对地下介质的近似程度低,以至于难以充分发挥联合定位的优势.为了解决当前联合定位存在的问题,本文在非均匀模型中利用三种震相走时开展地震定位.采用迎风差分格式数值求解程函方程获得非均匀模型中的高精度走时场,以此为基础得到初至P、sPg和PmP震相走时,利用得到的三震相走时共同约束震源位置.最后以2021年云南漾濞Ms6.4地震为例,利用合成和实际数据开展了地震定位测试研究.测试结果证实基于程函方程的三种震相走时地震定位方法能有效提高地震定位精度.

关键词：地震定位程函方程快速行进法非均匀模型

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基于MRI的分形分析和影像组学分析对畸胎瘤和其他颅内生殖细胞肿瘤的无创鉴别诊断

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国际医学放射学杂志 2024年第3期 371-372页

作者： s.liu X.Wang X.liu s.Li H.Liao X.Qiu 黄世豪

摘要目的颅内生殖细胞肿瘤（IGCT）的组织学亚型是决定治疗策略的重要因素，尤其是畸胎瘤。这项研究旨在根据分形特征和影像组学特征对畸胎瘤进行无创性诊断。方法

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Constrained Crystal Growth Behaviour under Unidirectional Melt Flow

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Journal of Materials science & Technology 1996年第2期12卷 156-158页

作者： liu, s Zhou, YH National Laboratory of solidification Processing Northwestern Polytechnical University Xi'an 710072 China

Melt flow has an important influence on the microstructure formation of alloys. In this paper the growth behaviour of constrained crystals is systematically studied. It is discovered that the constrained crystals have a quite complicated response to melt flow. It may grow upstream or downstream or keep its growth direction unchanged with the influence of melt flow. Also low growth velocity and high flow velocity favour the formation of spike-like crystal. A new model is suggested to explain these experimental results.

关键词： Crystal growth from melt

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Topological phases of a non-Hermitian coupled ssH ladder

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Chinese Physics B 2019年第10期28卷 269-273页

作者： J s liu Y Z Han C s liu Hebei Key Laboratory of Microstructural Material Physics School of Science Yanshan University

We study topological phases of a non-Hermitian coupled su-schrieffer-Heeger(ssH) ladder. The model originates from the brick-wall lattices in the two-row limit. The Hamiltonian can be brought into block off-diagonal form and the winding number can be defined with the determine of the block off-diagonal matrix. We find the determine of the offdiagonal matrix has nothing to do with the interleg hopping of the ladder. so the topological phases of the model are the same as those of the chains. Further numerical simulations verify the analysis.

关键词： topological phase non-Hermitian su-schrieffer-Heeger(ssH) ladder winding number

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