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Microstructure Evolution and Mechanical Properties of Friction Stir Welded Al-Cu-Li Alloy

Acta Metallurgica Sinica(English Letters) 2024年第5期37卷 855-871页

作者： Peng chen Wenhao chen Jiaxin chen zhiyu chen Yang Tang Ge Liu Bensheng Huang Zhiqing Zhang School of New Energy and Materials Southwest Petroleum UniversityChengdu 610500China Sichuan Provincial Engineering Research Center of Advanced Materials Manufacturing Technology for Shale Gas High-Efficient Exploitation Southwest Petroleum UniversityChengdu 610500China College of Materials Science and Engineering Chongqing UniversityChongqing 400045China School of Mechatronic Engineering Southwest Petroleum UniversityChengdu 610500China School of Robot Engineering Yangtze Normal UniversityChongqing 408100China

The investigation concentrates on friction stir welded(FSW)Al-Cu-Li alloy concerning its local microstructural evolution and mechanical properties.The grain features were characterized by electron back scattered diffraction(EBSD)technology,while precipitate characterization was conducted by using transmission electron microscopy(TEM)aligned along[011]Al and[001]Al zone axes.The mechanical properties are evaluated through micro-hardness and tensile testing.It can be found that nugget zones exhibit finely equiaxed grains evolved through complete dynamic recrystallization(DRX),primarily occurring in continuous dynamic recrystallization(CDRX)and discontinuous dynamic recrystallization(DDRX).In the thermal-mechanically affected zone(TMAZ),numerous sub-structured grains,exhibiting an elongated morphology,were created due to partial DRX,signifying the dominance of CDRX,DDRX,and geometric dynamic recrystallization(GDRX)in this region.T_(1)completely dissolves in the nugget zone(NZ)leading to the formation of Guinier-Preston zones and increase ofδ′,β′and S′.Conversely,T_(1)partially solubilizes in TMAZ,the lowest hardness zone(LHZ)and heat affected zone(HAZ),and the residual T_(1)undergoes marked coarsening,revealing various T_(1)variants.The solubilization and coarsening of T_(1)are primary contributors to the degradation of hardness and strength.θ′primarily dissolves and coarsens in NZ and TMAZ,whilst this precipitate largely coarsens in HAZ and LHZ.σ,TB,grain boundary phases(GBPs)and precipitate-free zone(PFZ)are newly generated during FSW.σexists in the TMAZ,LHZ and HAZ,whereas TB nucleates in NZ.GBPs and PFZ mostly develop in LHZ and HAZ,which can cause strain localization during tensile deformation,potentially leading to LHZ joint fracture.

关键词： Al-Cu-Li alloy Friction stir welding Microstructure evolution Mechanical properties

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Role of inflammatory lipid and fatty acid metabolic abnormalities induced by plastic additives exposure in childhood asthma

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Journal of Environmental Sciences 2024年第3期137卷 172-180页

作者： zhiyu chen Fang Li Lei Fu Yu Xia Ying Luo Ang Guo Xiaona Zhu Huifang Zhong Qian Luo Institute of Biomedical and Health Engineering Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China University of Chinese Academy of Sciences Beijing 100049China Rheumatology&Immunology Department of Shenzhen Children’s Hospital Shenzhen 518038China Hubei Key Laboratory of Environmental and Health Effects of Persistent Toxic Substances Institute of Environment and HealthJianghan UniversityWuhan 430056China

Lipid metabolism play an essential role in occurrence and development of asthma,and it can be disturbed by phthalate esters(PAEs)and organophosphate fame retardants(OPFRs).As a chronic infammatory respiratory disease,the occurrence risk of childhood asthma is increased by PAEs and OPFRs exposure,but it remains not entirely clear how PAEs and OPFRs contribute the onset and progress of the disease.We have profiled the serum levels of PAEs and OPFRs congeners by liquid chromatography coupled with mass spectrometry,and its relationships with the dysregulation of lipid metabolism in asthmatic,bronchitic(acute infammation)and healthy(non-infammation)children.Eight PAEs and nine OPFRs congeners were found in the serum of children(1–5 years old)from Shenzhen,and their total median levels were 615.16 ng/m L and 17.06 ng/m L,respectively.Moreover,the serum levels of mono-methyl phthalate(MMP),tri-propyl phosphate(TPP)and tri-n-butyl phosphate(TNBP)were significant higher in asthmatic children than in healthy and bronchitic children as control.Thirty-one characteristic lipids and fatty acids of asthma were screened by machine-learning random forest model based on serum lipidome data,and the alterations of infammatory characteristic lipids and fatty acids including palmitic acids,12,13-Di HODE,14,21-Di HDHA,prostaglandin D2 and Lyso PA(18:2)showed significant correlated with high serum levels of MMP,TPP and TNBP.These results imply PAEs and OPFRs promote the occurrence of childhood asthma via disrupting infammatory lipid and fatty acid metabolism,and provide a novel sight for better understanding the effects of plastic additives on childhood asthma.

关键词： Phthalate esters Organophosphate fame retardants Childhood asthma Lipid and fatty acid metabolism Machine-learning random forest model Chronic airway infammation

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基于深度元学习的小样本图像分类研究综述

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计算机工程与应用 2024年第8期60卷 1-15页

作者：周伯俊陈峙宇南通大学工程训练中心江苏南通226019 河海大学计算机与信息学院南京211100

深度元学习是解决小样本分类问题的流行范式。对近年来基于深度元学习的小样本图像分类算法进行了详细综述。从问题的描述出发对基于深度元学习的小样本图像分类算法进行概括,并介绍了常用小样本图像分类数据集及评价准则;分别从基于模... 详细信息

深度元学习是解决小样本分类问题的流行范式。对近年来基于深度元学习的小样本图像分类算法进行了详细综述。从问题的描述出发对基于深度元学习的小样本图像分类算法进行概括,并介绍了常用小样本图像分类数据集及评价准则;分别从基于模型的深度元学习方法、基于优化的深度元学习方法以及基于度量的深度元学习方法三个方面对其中的典型模型以及最新研究进展进行详细阐述。最后,给出了现有算法在常用公开数据集上的性能表现,总结了该课题中的研究热点,并讨论了未来的研究方向。

关键词：深度学习元学习小样本学习图像分类

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Negative effects of artiffcial nest boxes on birds:A review

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Avian Research 2023年第2期14卷 257-266页

作者： Luchang Zhang Xingjian Ma zhiyu chen Chunying Wang Zicheng Liu Xiang Li Xiaoying Xing College of Wildlife and Protected Area Northeast Forestry UniversityHarbin150040China Northeast Asia Biodiversity Research Center Harbin150040China Heilongjiang Luobei Dulu River Wetland Nature Reserve Administration Hegang154200China Heilongjiang Taipinggou National Nature Reserve Administration Hegang154200China Dalian Environmental Monitoring Center Dalian116023China

Artificial nest boxes are placed to attract birds to nest and breed in a specific location,and they are widely used in avian ecology research and in the attraction of insectivorous birds.There is evidence that artificial nest boxes can adversely affect breeding fitness but no great focus has been placed on this issue by researchers.Therefore,we retrieved 321 research papers regarding artificial nest boxes published from 2003 to 2022 and used the'Biblioshiny'program to extract and integrate keywords;we then summarized the adverse effects of artificial nest boxes on avian breeding success.The studies highlighted many drawbacks and misuses in the designing and placement of nest boxes;furthermore,bird attraction was decreased by their inappropriate selection,thus reducing breeding success.Regarding nest box production,there were shortcomings in the construction material,color,smell,and structural design of the boxes used.Nest boxes were also placed at inappropriate densities,locations,orientations,heights,and managed incorrectly.Finally,we propose suggestions for more efficient and safer artificial nest boxes for future use in avian ecology research and bird conservation.

关键词： Artificial nest box Avian breeding Management Negative effect Nest box hanging Nest box location Nest box structure

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Reusable electrochemical non-enzymatic glucose sensors based on Au-inlaid nanocages

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Nano Research 2022年第7期15卷 6490-6499页

作者： Lu Shen Zhen Liang zhiyu chen Can Wu Xuefeng Hu Jieyu Zhang Qing Jiang Yunbing Wang National Engineering Research Center for Biomaterials Sichuan UniversityChengdu 610065China

Mass detection of glucose,which is required in many applications,remains challenging.The commercial enzyme-based glucose test strips cannot be reused,and current non-enzymatic glucose sensors exhibit a narrow range of detection and slow glucose oxidation kinetics.Herein,controlled etching of Prussian blue analogue(PBA)nanocubes at the vertices is conducted and Au nanoparticles(Au NPs)are subsequently inlaid in the etched cavities by in-situ reduction of HAuCl4.The unique AuNP-PBA nanocomplexes exhibit low electrochemical potential for glucose oxidation,high electrocatalytic activity,and rapid redox electron transfer rate.Covalent immobilization of the Au-inlaid nanomaterials on a fine Au wire leads to a non-enzymatic glucose sensor with a particularly wide linear detection range(10μM to 16 mM),excellent anti-interference,and fast response.More importantly,the sensor is reusable,and its sensitivity is well maintained even after 150 times of detection.This new-concept material promises to enable high-throughput glucose detection at a low cost,which is essential in diabetic management and other healthcare applications.

关键词： non-enzymatic glucose sensors Prussian blue analogues gold nanoparticles electrochemistry reusable sensors

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Personalized day tour design for urban tourists with consideration to CO_(2) emissions

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Chinese Journal of Population,Resources and Environment 2022年第3期20卷 237-244页

作者： Lunwen Wu Tao Gu zhiyu chen Pan Zeng Zhixue Liao School of Business Administration Faculty of Business AdministrationSouthwestern University of Finance and EconomicsChengdu611130China

The growing awareness of climate change worldwide has led the urban tourism market to focus on balancing tourist tailored experiences and CO_(2) emissions.Therefore,designing personalized tourist routes with environ‐mental pollution consideration is preferable in this context.This study proposes an evolution algorithm based on reinforcement learning(FSRL-HA)to design a personalized day tour route that simultaneously considers the utility of tourists and the carbon emission.We conducted a case study in chengdu,Sichuan,China,to evaluate this algorithm's performance.The results indicate that the proposed algorithm outperforms selected baseline methods.Furthermore,the approach can provide more diverse route choices for different tourists,and an experiment was conducted to explore how tourist preferences affect tourist utilities.

关键词： Carbon emission Personalized day tour design Heuristic algorithm Reinforcement learning

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Real-time effects of nicotine exposure and withdrawal on neurotransmitter metabolism of hippocampal neuronal cells by microfluidic chip-coupled LC-MS

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Chinese Chemical Letters 2022年第6期33卷 3101-3105页

作者： zhiyu chen Lei Fu Xin-An Liu Zhiyi Yang Wenbo Li Fang Li Qian Luo Institute of Biomedical and Health Engineering Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China University of Chinese Academy of Sciences Beijing 100049China Shenzhen Engineering Laboratory of Single-molecule Detection and Instrument Development Shenzhen 518055China Guangdong Provincial Key Laboratory of Brain Connectome and Behavior CAS Key Laboratory of Brain Connectome and Manipulationthe Brain Cognition and Brain Disease Institute(BCBDI)Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research InstitutionsShenzhen 518055China

Nicotine ingested from smoking exerts neuroprotection and developmental neurotoxicity in central nervous system.It can produce several changes of cognitive behaviors through regulating the release of different neurotransmitters in the brain.However,the effects of nicotine exposure or withdrawal on neurotransmitter metabolism of hippocampus are still unclear.In this study,we real-time evaluated the dynamic alterations in neurotransmitter metabolism of hippocampal neuronal(HT22)cells induced by nicotine exposure and withdrawal at relevant exposure levels of smoking and secondhand smoke by using a microfluidic chip-coupled with liquid chromatography-mass spectrometry(MC-LC-MS)system.We found HT22 cells mainly released related neurotransmitters of tryptophan and choline metabolism,both nicotine exposure and withdraw altered its neurotransmitters and their metabolites release.Exposure to nicotine mainly altered the secretion of serotonin,kynurenic acid,choline and acetylcholine of HT22 cells to improve hippocampal dependent cognition,and the change are closely related to the dose and duration of exposure.Moreover,the altered metabolites could rapidly recover after nicotine withdrawal,but picolinic acid was elevated.MC-LC-MS system used in present study showed a greater advantage to detect unstable metabolites than conventional method by using in vitro model,and the results of dynamic alterations of neurotransmitter metabolism induced by nicotine might provide a potential targets for drug development of neuroprotection or cognitive improvement.

关键词： Nicotine Microfluidic chip-coupled LC-MS Hippocampal neuronal cells Neurotransmitter metabolism Cognition

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Comparing effectiveness and safety of paclitaxel plus raltitrexed vs. paclitaxel alone in second-line palliative chemotherapy for metastatic gastric adenocarcinoma: A randomized phase Ⅱ clinical trial

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Cancer Biology & Medicine 2023年第9期20卷 682-688页

作者： Xiaoying Zhao zhiyu chen Xiaowei Zhang Xiaodong Zhu Wen Zhang Lixin Qiu chenchen Wang Mingzhu Huang Zhe Zhang Wenhua Li Lei Yang Weijian Guo Department of Gastrointestinal Medical Oncology Fudan University Shanghai Cancer CenterShanghai 200032China Shanghai Medical College Fudan UniversityShanghai 200032China Department of Medical Oncology Nantong Tumor HospitalNantong 226006China

Objective:Paclitaxel(P)is a standard second-line chemotherapy in the treatment of advanced gastric cancer.This study compared the clinical outcome of a paclitaxel plus raltitrexed(RP)regimen as second-line treatment in metastatic gastric cancer(MGC)patients.Methods:An open,randomized,multi-center phase Ⅱ clinical trial was conducted involving 148 patients who were randomly assigned and treated with RP[raltitrexed(3 mg/m^(2)on day 1)and paclitaxel(135 mg/m^(2)on day 1 every 3 weeks)]or P[paclitaxel(135 mg/m^(2)on day 1 every 3 weeks)]as 2nd-line chemotherapy.The primary endpoint was progression-free survival(PFS).The secondary endpoints were the overall response rate(ORR),overall survival(OS),and safety.Results:PFS had a tendency to be prolonged with RP compared to P(2.7 months vs.1.7 months;P=0.148).OS was also prolonged with RP compared to P(10.2 months vs.6.1 months;P=0.140).The ORR was equal in the RP and P groups(6.8%and 4.0%;P=0.72).The disease control rate(DCR)in the RP and P groups was 56.2%and 36.0%,respectively.Grade 3-4 treatment-related adverse events occurred in 36.2%(RP)and 28.2%(P)of patients.Frequent grade 3-4 toxicities for RP and P were neutropenia(11.0%and 4.0%),anemia(1.4%and 4.0%),and thrombocytopenia(1.4%and 5.3%),and all grades of peripheral neurotoxicity(12.3%vs.17.3%).All grades of hepatic toxicity were demonstrated for the RP and P groups based on elevated aminotransferase levels(27.4%and 14.1%).Subgroup analysis shows if MGC was combined with ascites or peritoneal involvement,the OS of the RP regimen was longer(P=0.05).Conclusions:Second-line palliative chemotherapy with RP was shown to prolong the PFS and OS,especially among patients with ascites or peritoneal involvement,which warrants confirmation using larger sample studies.

关键词： Gastric adenocarcinoma raltitrexed paclitaxel second-line palliative chemotherapy

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Early Diagnosis of Bipolar Disorder Coming Soon:Application of an Oxidative Stress Injury Biomarker(BIOS)Model

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Neuroscience Bulletin 2022年第9期38卷 979-991页

作者： Zhiang Niu Xiaohui Wu Yuncheng Zhu Lu Yang Yifan Shi Yun Wang Hong Qiu Wenjie Gu Yina Wu Xiangyun Long Zheng Lu Shaohua Hu Zhijian Yao Haichen Yang Tiebang Liu Yong Xia zhiyu chen Jun chen Yiru Fang Clinical Research Center and Division of Mood Disorders Shanghai Mental Health CenterShanghai Jiao Tong University School of MedicineShanghai200030China Division of Mood Disorders Shanghai Hongkou Mental Health CenterShanghai200083China Information and Statistics Department Shanghai Mental Health CenterShanghai200030China Department of Psychiatry Tongji HospitalTongji University School of MedicineShanghai200333China Department of Psychiatry First Affiliated HospitalZhejiang University School of MedicineHangzhou310003China Nanjing Brain Hospital The Affiliated Brain Hospital of Nanjing Medical UniversityNanjing210029China Shenzhen Mental Health Center Shenzhen518003China Affiliated Mental Health Center Zhejiang University School of MedicineHangzhou Seventh People’s HospitalHangzhou310013China CAS Center for Excellence in Brain Science and Intelligence Technology Shanghai200031China Shanghai Key Laboratory of Psychotic Disorders Shanghai201108China

Early distinction of bipolar disorder(BD)from major depressive disorder(MDD)is difficult since no tools are available to estimate the risk of BD.In this study,we aimed to develop and validate a model of oxidative stress injury for predicting BD.Data were collected from 1252 BD and 1359 MDD patients,including 64 MDD patients identified as converting to BD from 2009 through 2018.30 variables from a randomly-selected subsample of 1827(70%)patients were used to develop the model,including age,sex,oxidative stress markers(uric acid,bilirubin,albumin,and prealbumin),sex hormones,cytokines,thyroid and liver function,and glycolipid metabolism.Univariate analyses and the Least Absolute Shrinkage and Selection Operator were applied for data dimension reduction and variable selection.Multivariable logistic regression was used to construct a model for predicting bipolar disorder by oxidative stress biomarkers(BIOS)on a nomogram.Internal validation was assessed in the remaining 784 patients(30%),and independent external validation was done with data from 3797 matched patients from five other hospitals in China.10 predictors,mainly oxidative stress markers,were shown on the nomogram.The BIOS model showed good discrimination in the training sample,with an AUC of 75.1%(95%CI:72.9%–77.3%),sensitivity of 0.66,and specificity of 0.73.The discrimination was good both in internal validation(AUC 72.1%,68.6%–75.6%)and external validation(AUC 65.7%,63.9%–67.5%).In this study,we developed a nomogram centered on oxidative stress injury,which could help in the individualized prediction of BD.For better real-world practice,a set of measurements,especially on oxidative stress markers,should be emphasized using big data in psychiatry.

关键词： Early recognition Bipolar disorder Big data Oxidative stress BIOS model

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早期短暂M1巨噬细胞在骨组织工程中的作用及应用

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中国组织工程研究 2024年第4期28卷 594-601页

作者：杨雨晴陈志宇河北医科大学口腔医学院·口腔医院修复科河北省口腔医学重点实验室河北省口腔疾病临床医学研究中心河北省石家庄市050017

背景:早期短暂存在的M1巨噬细胞在骨组织工程材料植入后可以发挥有益作用,调控M1巨噬细胞产生早期适度炎症反应的策略研究逐渐广泛,在骨组织工程材料的设计中取得了许多研究进展。目的:综述早期短暂存在的M1巨噬细胞在骨组织工程中的作... 详细信息

背景:早期短暂存在的M1巨噬细胞在骨组织工程材料植入后可以发挥有益作用,调控M1巨噬细胞产生早期适度炎症反应的策略研究逐渐广泛,在骨组织工程材料的设计中取得了许多研究进展。目的:综述早期短暂存在的M1巨噬细胞在骨组织工程中的作用,以及近年诱导激活早期短暂M1巨噬细胞策略在骨组织工程领域的应用研究进展。方法:检索收录在PubMed、万方数据库、CNKI中国期刊全文数据库2012年1月至2022年10月的相关文献,以“M1,巨噬细胞,骨免疫学,骨免疫调节,骨缺损,骨再生,炎症反应,血管生成,组织工程,生物材料”为中文检索词,以“M1,macrophage,bone,osteogenesis,osteoimmunology,angiogenesis”等为英文检索词,筛选排除与研究目的无关与重复的文献,最终选取符合标准的63篇文献进行综述。结果与结论:早期短暂存在的M1巨噬细胞在骨组织工程中具有促进血管形成、促进骨髓间充质干细胞成骨分化以及促进M2表型转化的重要作用。诱导激活早期短暂M1巨噬细胞策略能够以符合早期自然骨愈合规律的方式调控局部免疫微环境进而促进骨缺损修复,策略包括通过改变骨组织工程材料的理化性质促进M1巨噬细胞产生适当炎症反应,递送细胞因子、微小RNA或生物活性离子实现M1向M2巨噬细胞顺序极化,控释抗炎物质实现M1巨噬细胞介导的早期炎症反应的保持。

关键词：巨噬细胞 M1 炎症反应骨缺损骨再生组织工程顺序极化血管生成

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