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Intermetallic Compounds Formation in Dissimilar Friction Stir Welding of Mg/Cu Alloys

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Acta Metallurgica Sinica(English Letters) 2024年第9期37卷 1523-1532页

作者： Xue li Qingzhen Zhao Hao Su ji chen Chuansong Wu MOE Key Lab for liquid-Solid Structure Evolution and Materials Processing Institute of Materials JoiningShandong UniversityJinan250061China

Joining dissimilar Mg/Cu alloys was still an intractable problem because of the excessive intermetallic compounds(IMCs)and poor mechanical properties using conventional welding *** the present study,friction stir welding was employed for the butt joining of dissimilar AZ31B Mg-alloy and T2 pure Cu ***-free Mg/Cu joints were obtained with Mg-RS and Cu-AS configuration,at a welding speed of 50 mm/min and tool rotating speeds of 325 r/min,625 r/min and 925 r/*** the joining interface,both Mg_(2)Cu and MgCu_(2) IMC phases were observed,with a clear,uniform and continuous IMCs layer composed of two sub-layers,layer-A of Mg+Mg_(2)Cu and layer-B of Mg_(2)Cu+MgCu_(2).The maximum ultimate tensile strength of the Mg/Cu friction stir welding joint reached 130 MPa at 925 r/min due to enhanced mechanical interlocking between Mg and Cu,as well as sufficient metallurgical bonding at the joining interface with an IMCs layer thickness in the range of 1.0-2.0μm.

关键词： Friction stir welding Magnesium Copper Intermetallic compounds Mechanical properties

Changes of retinal vessel density in low to moderate myopic eyes with orthokeratology evaluated by optical coherence tomography angiography

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International Journal of Ophthalmology(English edition) 2023年第9期16卷 1512-1520页

作者： jia-Hui Shi Yi-Ping Zhao Gang liu Xin-Yi Huang li-li Lang Wan-cheng jia ji-li chen Medical College of Anhui University of Science and Technology Huainan 232000Anhui ProvinceChina South Hospital of the Sixth People’s Hospital Shanghai 201400China Shibei Hospital Shanghai 200435China

AIM:To explore the effect of orthokeratology(OK)fitting on retinal vessel density in low to moderate myopia adolescents by using optical coherence tomography ***:Children aged 10 to 14y with a cycloplegic spherical equivalent refraction of−0.50 diopter(D)to−5.00 D and astigmatism with more than−1.50 D were *** enrolled adolescents were divided into OK group and spectacle *** regular followup,adolescents were measured respectively at pre-wear,1,3,and 6mo after *** follow-up included uncorrected distance visual acuity(UDVA),axial length(AL),superficial capillary plexus density(SCPD),deep capillary plexus density(DCPD),central retinal thickness(CRT),foveal avascular zone area(FAZ-A),foveal avascular zone perimeter(FAZ-P)and foveal vessel density in a 300-μmwide region around foveal avascular zone(FD-300).The collected data were analyzed using statistical ***:By one month,SCPD significantly increased in the fovea and superior retina,and DCPD significantly increased inferiorly in OK group compared to spectacle group(P0.05).OK group showed a significant improvement in UDVA after wearing OK,compared to spectacle group(P0.05).CONCLUSION:Short-term OK worn can increase local retinal vessel density in adolescents with low-to-moderate myopia.

关键词： optical coherence tomography angiography orthokeratology myopia axial length retinal capillary plexus density

Dynamic versus static ultra-widefield fluorescein angiography in eyes with diabetic retinopathy:a pilot prospective cross-sectional study

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International Journal of Ophthalmology(English edition) 2021年第3期14卷 409-415页

作者： Hang-Qi Shen jing Wang Tian Niu ji-li chen Xun Xu Department of Ophthalmology Shanghai General HospitalShanghai Jiao Tong University School of MedicineShanghai 200080China Shanghai Key Laboratory of Ocular Fundus Diseases Shanghai General HospitalShanghai Jiao Tong University School of MedicineShanghai 200080China Shanghai Engineering Center for Visual Science and Photomedicine Shanghai Gencral HospitalShanghai Jiao Tong University School of MedicineShanghai 200080China Shanghai Engineering Center for Precise Diagnosis and Treatment of Eye Diseases Shanghai General HospitalShanghai Jiao Tong University School of MedicineShanghai 200080China National Clinical Research Center for Eye Diseases Shanghai General HospitalShanghai Jiao Tong University School of MedicineShanghai 200080China Department of Ophthalmology Shanghai Shibei Hospital of Jing'an DistrictShanghai 200435China

AIM:To analyze differences in ultra-widefield fluorescein angiography(UWFA)findings between dynamic and static images of eyes with diabetic retinopathy(DR).METHODS:This cross-sectional study included 28 eyes of 28 patients with DR undergoing UWFA.A series of UWFA images acquired from each patient were converted into a time-lapse video and used as a dynamic image.A single,clear,arteriovenous phase image was chosen as a static ***-perfusion index(NPI)and its correlation with vascular abnormalities in different zones were compared between dynamic and static UWFA ***:NPI appeared to increase from the center to the far-periphery in both *** NPI was lower in the total retinal area(0.26 vs 0.29,P=0.009)and farperiphery(0.33 vs 0.36,adjusted P=0.042),which was contrary to the static ***-peripheral NPI was associated with intraretinal microvascular abnormality in the posterior area in both ***:Time-lapse dynamic UWFA imaging is a useful modality to differentially diagnose hypofluorescence in the most peripheral *** modality could provide a reliable method for NPI measurement.

关键词： diabetic retinopathy ultra-widefield fluorescein angiography non-perfusion index time-lapse photography

Investigating effect of coke porosity on blast furnace performance based on multi-physical fields

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Journal of Iron and Steel Research International 2024年第2期31卷 357-367页

作者： ji chen Zhao Lei Zhe Yao li Wang Qiang ling Ping Cui Anhui Province Key Laboratory of Coal Clean Conversion and High Valued Utilization School of Chemistry and Chemical EngineeringAnhui University of TechnologyMa’anshan243002AnhuiChina Shanxi Academy of Printing Technology Research Institute Co. Ltd.Xi’an710077ShaanxiChina

Reducing coke use is an effective measure to reduce carbon emission and energy consumption in the blast furnace(BF)***,BF is a high-temperature moving bed reactor,where complex physical transformations coupled with complicated reactions *** makes it challenging to investigate the factors determining BF performance with the conventional method.A multi-physical field coupling mathematical model of BF was thus developed to describe its mass and heat transfer as well as its intrinsic ***,the proposed model was validated with the production *** coupling conditions,influences of dominating reactions on BF performance(temperature distribution,gas distribution,iron formation reaction,and direct reduction degree)were *** results indicated that coke combustion,indirect reduction,and direct reduction of iron ore mainly took place nearby the shaft tuyere,cohesive zone,and dripping zone,***,the rate of coke solution loss reaction was increased with the rising coke porosity in the cohesive *** the effect of coke porosity on the efficiency and stability of BF,the coke porosity of 0.42 was regarded as a reasonable value.

关键词： Blast furnace Mathematical model Multi-physical field Simulation Coke porosity

Onset of Coronary Heart Disease is Associated with HCMV Infection and Increased CD14^+CD16^+Monocytes in a Population of Weifang,China

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Biomedical and Environmental Sciences 2020年第8期33卷 573-582页

作者： li Hong Zheng WANG Qin ZHANG Yi Yuan WANG jin Dong WU Hong Juan ZHANG Mo Gen li ji chen liU Zhi Jun Department of Medical Microbiology Weifang Medical UniversityWeifang 261053ShandongChina National Institute for Viral Diseases Control and Prevention China Center for Disease Control and PreventionBeijing 102206China School of Clinical Medicine Weifang Medical UniversityWeifang 261053ShandongChina Morphological Laboratory Weifang Medical UniversityWeifang 261053ShandongChina

Objective To investigate the relationship between human cytomegalovirus(HCMV)infection and peripheral blood CD14+CD16+monocytes in the pathogenesis of coronary heart disease(CHD),and to elucidate the mechanism of pathogenesis in CHD by analyzing the correlation between infection,inflammation,and CHD,to provide a basis for the prevention,evaluation,and treatment of the *** In total,192 patients with CHD were divided into three groups:latent CHD,angina pectoris,and myocardial ***-IgM and-IgG antibodies were assessed using EliSA;CD14+CD16+monocytes were counted using a five-type automated hematology analyzer;mononuclear cells were assessed using fluorescence-activated cell sorting;and an automatic biochemical analyzer was used to measure the levels of triglyceride,cholesterol,high-and low-density lipoprotein cholesterols,lipoprotein,hs-CRp and *** The positive rates of HCMV-IgM and-IgG were significantly higher in the CHD groups than in the control *** infection affects lipid metabolism to promote immune and inflammatory *** HCMV infection has a specific correlation with the occurrence and development of *** expression of CD14+CD16+mononuclear cells in the CHD group was increased accordingly and correlated with acute HCMV ***,HCMV antibody as well as peripheral blood CD14+CD16+mononuclear cells can be used to monitor the occurrence and development of CHD.

关键词： Human cytomegalovirus Coronary heart disease Antibody CD14+CD16+monocytes Weifang

Thermal stability of permafrost under U-shaped crushed rock embankment of the Qinghai-Tibet Railway

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Advances in Climate Change Research 2024年第1期15卷 158-169页

作者： Kun-Ming XU Guan-li jiANG ji chen Qing-Bai WU State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Beiluhe Observation Station of Frozen Soil Environment and Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou730000China

The U-shaped crushed rock embankment(UCRE),of which widely utilized in the permafrost regions along the Qinghai-Tibet Railway,has the capability to rapidly reduce the ground temperature of the underlying ***,there remains uncertainty regarding the adaptation of UCRE to climate change and its long-term cooling *** study focuses on nine UCRE monitoring sites along the Qinghai-Tibet Railway to analyze the dynamic variations of the ground temperature underlying permafrost from 2006 to *** efficiency of UCRE in stabilizing permafrost temperature in different permafrost zones is evaluated by considering the permafrost table,ground temperature,and MAGT,as well as the temperature difference between the top and bottom of the crushed rock layer and the ground temperature variation index(GTVI).The results show that UCRE is suitable for application in extremely unstable warm permafrost regions where the MAGT is higher than-0.5℃.Moreover,UCRE effectively diminishes the disparity in permafrost thermal stability between the sunny and shaded shoulders of the *** short-term and long-term effect of cooling permafrost is experiencing a change related with permafrost ***,in stable cold permafrost regions with MAGT lower than-1.5℃,the long-term cooling effect of UCRE on permafrost seems to gradually di-minishes,but UCRE continues to fulfill the role of stabilizing the underlying permafrost thermal state over the *** results show that UCRE can quickly restore and stabilize the thermal state of permafrost in the early stages of construction,and adapt to the influence of future climate *** findings provide important guidance for understanding the variations of permafrost thermal stability beneath the embankment in permafrost regions,as well as for improving the embankment stability and operational safety of the Qinghai-Tibet Railway.

关键词： Qinghai-Tibet Railway U-shaped crushed rock embankment Climate change Permafrost zone Ground temperature variation index Long-term coolingrole

Presence of a long nuclear-localization signal sequence in homeodomain transcription factor Nkx 1.2

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Journal of Oceanology and limnology 2024年第2期42卷 620-626页

作者： Xinyi li lihui chen Xinyuan WANG chen SUN Guangdong ji Guobin HU Zhenhui liU College of Marine life Science and Institute of Evolution&Marine Biodiversity Ocean University of ChinaQingdao 266003China Laoshan Laboratory Qingdao 266237China

Homeodomains,a 60-amino acid sequence encoded by 180 nucleotides,are highly conserved DNA-binding motifs that are present in a variety of transcription factors in species ranging from yeast to *** NKX proteins belong to the homeodomain(HD)-containing transcription factor *** play vital roles in the regulation of ***1-2 is one member of the NKX *** present,information about its nuclear localization signal(NLS)sequence is *** studied the NLS sequence of zebrafish Nkx1.2 by introducing sequence changes such as deletion,mutation,and truncation,and identified an NLS motif(QNRRTKWKKQ)that is localized at the C-terminus of the ***,the deletion of two amino acid residues(RR)in this NLS motif prevents Nkx1.2 from entering the nucleus,indicating that the two amino acids are essential for Nkx1.2 nuclear ***,the NLS motif alone is unable to target cytoplasmic protein glutathione S-transferase(GST)to the *** intact homeodomain is necessary for mediating the complete nuclear transport of cytoplasmic *** most nuclear import proteins with short NLS sequences,a long NLS is present in zebrafish *** also demonstrated that the sequences of homeodomain of NKX1.2 are well conserved among different *** study is informative to verify the function of the NKX1.2 protein.

关键词： NKX1.2 NKX protein homeodomain nuclear localization signal(NLS) nuclear transport

Controlling electrodeposited Ni layers by different-sized graphene oxides enables conductive e-textiles for the highly sensitive electrochemical detection of glucose

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Nano Research 2024年第7期17卷 6258-6264页

作者： Zhen li Zibo chen Xiaodong ji Huihui jin Yunfa Si jingwei Zhang cheng chen Daping He Sanya Science and Education Innovation Park of Wuhan University of Technology Sanya 572000China School of Science Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Hubei Engineering Research Center of RF-Microwave Technology and Application Wuhan University of TechnologyWuhan 430070China

With the increasing popularity of wearable electronic devices,there is an urgent demand to develop electronic textiles(e-textiles)for device ***,the difficulty in reconciliation between conductivity and manufacturing costs hinders their large-scale practical ***,we reported a facile and economic method for preparing conductive ***,nonconductive polypropylene(PP)was wrapped by reduced graphene oxide(rGO),followed by the electrodeposition of Ni nanoparticles(NPs).Notably,modulating the sheet size of graphene oxide(GO)resulted in controllable deposition of Ni NPs with adjustable size,allowing for controlled manipulations over the structures,morphologies,and conductivity of the obtained e-textiles,which influenced their performance in electrochemical glucose detection *** optimal material,denoted as Ni/rGO+(0.2)/PP,exhibited an impressive conductivity of 7.94×10^(4)S·m^(−1).With regard to the excellent conductivity of the as-prepared e-textiles and the high electrocatalytic activity of Ni for glucose oxidation,the asprepared e-textiles were subjected to glucose *** was worth emphasizing that the Ni/rGO_(0.2)/PP-based electrode demonstrated promising performance for nonenzymatic/label-free glucose detection,with a detection limit of 0.36μM and a linear response range of 0.5μM to 1 *** study paves the way for further development and application prospects of conductive etextiles.

关键词： conductive e-textiles nonenzymatic/label-free glucose detection controllable Ni deposition graphene oxides sizedependent effect

Tracing nitrate sources in one of the world's largest eutrophicated bays(Hangzhou Bay):insights from nitrogen and oxygen isotopes

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Acta Oceanologica Sinica 2024年第6期43卷 86-95页

作者： Zhi Yang jianfang chen Haiyan jin Hongliang li Zhongqiang ji Yangjie li Bin Wang Zhenyi Cao Qianna chen Key Laboratory of Marine Ecosystem Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China

Eutrophication caused by inputs of excess nitrogen(N) has become a serious environmental problem in Hangzhou Bay(China),but the sources of this nitrogen are not well *** this study,the August 2019 distributions of salinity,nutrients [nitrate(NO_(3)^(-)),nitrite,ammonium,and phosphate],and the stable isotopic composition of NO_(3)^(-)(δ^(15)N and δ^(18)O) were used to investigate sources of dissolved inorganic nitrogen(DIN) to Hangzhou B *** distributions of nitrate,salinity,and nitrate δ^(18)O indicate that the Qiantang River,the Changjiang River,and nearshore coastal waters may all contribute nitrate to the *** on the isotopic compositions of nitrate in these potential source waters and conservative mixing of nitrate in our study area,we suggest that the NO_(3)^(- )in Hangzhou B ay was likely derived mainly from soils,synthetic N fertilizer,and manure and ***-member modeling indicates that in the upper half of the bay,the Qiantang River was a very important DIN source,possibly contributing more than 50% of DIN in the bay head *** the lower half of the bay,DIN was sourced mainly from strongly intruding coastal *** coming directly from the Changjiang River made a relatively small contribution to Hangzhou Bay DIN in August 2019.

关键词： nitrogen isotopes oxygen isotopes nitrogen cycle nitrate sources Hangzhou Bay