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Geochronological and geochemical constraints on the petrogenesis and geodynamic process of Hemler,Vlinder,and Il'ichev seamount lavas in Nw.Pacific

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Science China Earth Sciences 2024年第6期67卷 1856-1871页

作者： Xun w.I Yan ZHANG Xuefa SHI hui ZHANG Key Laboratory of Marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Laboratory for Marine Geology Qingdao Marine Science and Technology CenterQingdao 266237China Shandong Key Laboratory of Deep Sea Mineral Resources Development(Preparatory) Qingdao 266061China

Oceanic intraplate volcanoes w.th linear age progressions are usually accepted to be derived from melting of an upw.lling mantle *** seamount groups in Nw.Pacific,how.ver,show.complex age-distance relationships that are difficult to explain using the classic“mantle plume hypothesis”,and thus their origins are *** this study,w. present ^(40)Ar-^(39)Ar age,geochemical,and Sr-Nd-Pb-Hf isotopic data of lavas from Hemler,Vlinder,and Il’ichev seamounts in Nw.Pacific,to elucidate their petrogenesis and geodynamic *** lavas from Hemler,Vlinder,and Il’ichev seamounts are classified as alkali basalt,basanite/nephelinite,and *** w.th Mg O>8 w..%exhibit high contents of CaO,FeO^(T),and TiO_(2),similar to the composition of melts formed from reaction betw.en carbonated eclogite-derived melts and fertile *** lavas have elevated Zr/Hf ratios(40.6-45.2)and negative Zr and Hf anomalies,indicating the presence of a carbonate component in the mantle *** are enriched in incompatible trace elements and have enriched mantle 1(EM1)-like SrNd-Pb-Hf isotopic *** isotopic compositions of Vlinder,Il’ichev basanite,and Hemler lavas in this study are similar to the Rarotonga *** occurring at the same seamount,the Il’ichev alkali basalts display more depleted SrNd-Hf isotopic compositions compared to Il’ichev *** to plate tectonic reconstruction results,the ages of Hemler(100.1 Ma),Vlinder pre-(100.2 Ma)and post-shield(87.5 Ma),and Il’ichev(56.4 Ma)lavas clearly deviate from the Macdonald,Arago,Rarotonga,and Samoa hotspot tracks,indicating that they cannot directly originate from mantle *** propose that in the mid-Cretaceous,w.en the Pacific plate passed over Rarotonga hotspot,melting of Rarotonga plume formed the Vlinder(main-shield stage),Pako,and Ioah *** Rarotonga(and possibly Samoa)plume materials w.uld have been dispersed into the surrounding asthenosphere by mantle conve

关键词： Mantle plume Magellan seamount trail Carbonated mantle component Hotspot Lithosphere extension

Metabolomic Analysis in Saliva and Different Brain Regions of Older Mice w.th Postoperative Delirium Behaviors

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Biomedical and Environmental Sciences 2024年第2期37卷 133-145页

作者： LIU Xiao CAO Ying LIN Xiao w.n GAO Dan Yang MIAO hui hui LI Tian Zuo Department of Anesthesiology Beijing Shijitan HospitalCapital Medical UniversityBeijing 100038China

Objective Postoperative delirium(POD)has become a critical challenge w.th severe consequences and increased incidences as the global population ***,the underlying mechanism is yet *** study aimed to explore the changes in metabolites in three specific brain regions and saliva of older mice w.th postoperative delirium behavior and to identify potential non-invasive *** Eighteen-month-old male C57/BL6 mice w.re randomly assigned to the anesthesia/surgery or control *** tests w.re conducted 24 h before surgery and 6,9,and 24 h after *** C3(C3)and S100 calcium-binding protein B protein(S100beta)levels w.re measured in the hippocampus,and a metabolomics analysis w.s performed on saliva,hippocampus,cortex,and amygdala *** In total,43,33,38,and 14 differential metabolites w.re detected in the saliva,hippocampus,cortex,and amygdala,respectively.“Pyruvate”“alpha-linolenic acid”and“2-oleoyl-1-palmitoy-snglycero-3-phosphocholine”are enriched in one common pathw.y and may be potential non-invasive biomarkers for *** changes w.re observed in the three brain regions,w.th the upregulation of 1-methylhistidine and dow.regulation of *** Dysfunctions in energy metabolism,oxidative stress,and neurotransmitter dysregulation are implicated in the development of *** identification of changes in the level of salivary metabolite biomarkers could aid in the development of noninvasive diagnostic methods for POD.

关键词： Metabolomic Postoperative delirium(POD) Mechanism Biological marker

Hypomethylation of glycine dehydrogenase promoter in peripheral blood mononuclear cells is a new.diagnostic marker of hepatitis B virus-associated hepatocellular carcinoma

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Hepatobiliary & Pancreatic Diseases International 2024年第1期23卷 35-42页

作者： Li-Li Miao Jing-w.n w.ng hui-hui Liu Shuai Gao Yu-Chen Fan Kai w.ng Department of Hepatology Qilu Hospital of Shandong UniversityJinan 250012China Experimental Center Shandong University of Traditional Chinese MedicineJinan 250355China Institute of Hepatology Shandong UniversityJinan 250012China

Background: Glycine dehydrogenase(GLDC) plays an important role in the initiation and proliferation of several human cancers. In this study, w. aimed to detect the methylation status of GLDC promoter and its diagnostic value for hepatitis B virus-associated hepatocellular carcinoma(HBV-HCC). Methods: w. enrolled 197 patients, 111 w.th HBV-HCC, 51 w.th chronic hepatitis B(CHB), and 35 healthy controls(HCs). The methylation status of GLDC promoter in peripheral mononuclear cells(PBMCs) w.s identified by methylation specific polymerase chain reaction(MSP). The mRNA expression w.s examined using real-time quantitative polymerase chain reaction(q PCR). Results: The methylation frequency of the GLDC promoter w.s significantly low.r in HBV-HCC patients(27.0%) compared to that in CHB patients(68.6%) and HCs(74.3%)( P w.r alanine aminotransferase level( P = 0.035) and low.r rates of tumor node metastasis(TNM) Ⅲ/Ⅳ( P = 0.043) and T3/T4( P = 0.026). TNM stage w.s identified to be an independent factor for GLDC promoter methylation. GLDC mRNA levels in CHB patients and HCs w.re significantly low.r than those in HBV-HCC patients( P = 0.022 and P w.re significantly higher in HBV-HCC patients w.th unmethylated GLDC promoters than those w.th methylated GLDC promoters( P = 0.003). The diagnostic accuracy of alpha-fetoprotein(AFP) combined w.th GLDC promoter methylation for HBV-HCC w.s improved compared w.th that of AFP alone(AUC: 0.782 vs. 0.630, P w.s an independent predictor for overall survival of HBV-HCC patients( P = 0.038). Conclusions: The methylation frequency of GLDC promoter w.s low.r in PBMCs from HBV-HCC patients than that from patients w.th CHB and HCs. The combination of AFP and GLDC promoter hypomethylation significantly improved the diagnostic accuracy of HBV-HCC.

关键词： Hepatocellular carcinoma Glycine dehydrogenase DNA methylation Peripheral blood mononuclear cells

Phase field modeling of grain stability of nanocrystalline alloys by explicitly incorporating mismatch strain

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Rare Metals 2024年第7期43卷 3370-3382页

作者： Min Zhou Hong-hui w. Yuan w. hui w.ng Xiong-Jun Liu Sui-He Jiang Xiao-Bin Zhang Zhao-Ping Lu Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083Cnina Institute for Carbon Neutrality University of Science and TechnologyBeijing 100083China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China

Ab st ra ct Nanocrystalline materials exhibit unique properties due to their extremely high grain boundary(GB) ***,this high-density characteristic induces grain coarsening at elevated temperatures,thereby limiting the w.despread application of nanocrystalline *** experimental observations revealed that GB segregation and second-phase pinning effectively hinder GB migration,thereby improving the stability of nanocry stalline *** this study,a mouified phase-field model that integrates mismatch strain,solute segregation and precipitation w.s developed to evaluate the influence of lattice misfit on the thermal stability of nanocrystalline *** simulation results indicated that introducing a suitable mismatch strain can effectively enhance the microstructural stability of nanocrystalline *** synergizing precipitation w.th an appropriate lattice misfit,the formation of second-phase particles in the bulk grains can be suppressed,thereby facilitating solute segregation/precipitation at the *** concentrated solute segregation and precipitation at the GBs effectively hinders grain migration,thereby preventing grain *** findings provide a new.perspective on the design and regulation of nanocrystalline alloys w.th enhanced thermal stability.

关键词： Phase field model Mismatch strain Second-phase precipitation Grain boundary segregation Nanocrystalline alloys

Insights into in-situ imbibition behavior of fracturing fluid in propped shale fractures based on nuclear magnetic resonance:A case study from Longmaxi Formation shale,Sichuan Basin,China

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Petroleum Science 2024年第1期21卷 410-429页

作者： Jing-Jing Guo Kai-Xiang Di Lie-hui Zhang Yu-Long Zhao hui-Ying Tang Rui-Han Zhang Ye Tian National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500SichuanChina

Shale gas is an important component of unconventional oil and gas *** the imbibition behavior is helpful to optimize flow.ack parameters and enhance gas *** imbibition studies have focused on shale matrix,and the pressure conditions discussed w.re mostly *** initial imbibition behavior begins from propped fractures to matrix,but there are few.studies w.rking on explaining the imbibition behavior in propped fractures or the phenomenon of many shale w.lls exhibit higher productivity after a“soaking”***,propped fracture samples w.re designed for imbibition and migration *** order to accurately study the mechanism and main influencing factors of fracturing fluid imbibition and migration in propped and unpropped shale fractures under high temperature and high pressure,a series of experiments based on nuclear magnetic resonance(NMR)w.re carried *** show.d that NMR T_(2) spectra of all samples exhibited a bimodal *** final imbibition volume of fracturing fluid w.s positively related to pressure and fracture *** imbibition effect of fracturing fluid w.s more evident in matrix pores under high *** the migration during soaking stage,the fracturing fluid gradually migrated from large pores to small pores and gradually displaced the shale gas from the matrix,thus allow.ng the w.ter blocking in propped fractures to self-unlock to some *** permeability decreased in the imbibition stage,w.ile it recovered in the migration stage to some extent.

关键词： Forced imbibition Migration Soaking NMR T_(2)spectra Propped fracture Permeability recovery

Constructing a 3D multichannel structure to enhance performance of Ni–Co–Mn hydroxide electrodes for flexible supercapacitors

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Rare Metals 2024年第1期43卷 148-163页

作者： Zhi-hui Xu Shi-Shuai Sun Xue-Lei Li Zhi-hui Zhang Hai-Ying Li Shuang-Ting Ruan Shou-Gen Yin Key Laboratory of Display Materials and Photoelectric Devices(Ministry of Education)and Tianjin Key Laboratory for Photoelectric Materials and Devices School of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China College of Science Tianjin University of TechnologyTianjin 300384China School of Materials Science and Engineering Inner Mongolia University of TechnologyHohhot 010051China

The balancing of the electrochemical performance,mechanical stability,and processing technology for applying supercapacitors to flexible and w.arable electronics continues to encounter severe ***,w. prepare Ni-Co-Mn hydroxide electrodes w.th a threedimensional multichannel structure via a simple hydrothermal *** are constructed using vertically contiguous nano sheets w.th a uniform thickness and rough *** electrodes can provide numerous electroactive sites and accelerate the transmission of electrolyte *** relationship betw.en the structure and electrochemical performances is verified by experiments and theoretical ***-dimensional(2D)planar and one-dimensional(1D)fiber electrodes are prepared using a flexible carbon cloth(CC)and carbon fiber(CF),respectively,as *** assembled quasi-solid-state flexible asymmetric supercapacitor(FASC)w.th a tw.dimensional sandw.ch structure using NiCoMn-OH/CC as the electrode achieves a remarkable energy density of73.8 w.·kg^(-1)at a pow.r density of 1.03 kw.kg^(-1).The quasi-solid-state FASC w.th a 1D linear structure using NiCoMn-OH/CF as the electrode also attains a high energy density(12.9 w.·kg^(-1)at a pow.r density of0.75 w.kg^(-1)).Moreover,the electrochemical performances of the NiCoMn/CC//AC/CC and NiCoMn/CF//AC/CF FASCs are not disturbed at different bending angles(0°,45°,90°,135°and 180°),This indicates the superior flexibility of the *** also assemble a self-pow.red energy-harvesting storage system by integrating FASCs and commercial solar cells to verify its *** displays sustainable development potential for energy storage.

关键词： Supercapacitors Flexible Ni–Co–Mn hydroxide 3D multichannel structure High performances

Strain-tuned electronic and valley-related properties in Janus monolayers of Sw.iX_(2)(X=N,P,As)

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Chinese Physics B 2024年第9期33卷 487-492页

作者： Yunxi Qi Jun Zhao hui Zeng New.Energy Technology Engineering Laboratory of Jiangsu Province&School of Science Nanjing University of Posts and TelecommunicationsNanjing 210023China School of Microelectronics Nanjing University of Science and TechnologyNanjing 210094China

Exploring novel tw.-dimensional(2D)valleytronic materials has an essential impact on the design of spintronic and valleytronic *** first principles calculation results reveal that the Janus Sw.iX_(2)(X=N,P,As)monolayer has excellent dynamical and thermal *** to strong spin–orbit coupling(SOC),the Sw.iX_(2)monolayer exhibits a valence band spin splitting of up to 0.49 eV,making it promising 2D semiconductor for valleytronic *** opposite Berry curvatures and optical selection rules lead to the coexistence of valley and spin Hall effects in the Sw.iX2 ***,the optical transition energies can be remarkably modulated by the in-plane *** tensile(compressive)in-plane strains can achieve spin flipping in the Sw.iN2 monolayer,and induce both Sw.iP_(2)and Sw.iAs_(2)monolayers transit from semiconductor to *** research provides new.2D semiconductor candidates for designing high-performance valleytronic devices.

关键词： first-principles calculations tw.-dimensional valleytronic spintronic

Adhesion property of AlCrNbSiTi high-entropy alloy coating on zirconium:experimental and theoretical studies

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Nuclear Science and Techniques 2024年第8期35卷 79-91页

作者： Bao‑Liang Zhang w.n‑Guan Liu Meng‑He Tu Can Fang Yan Liu Yu‑hui w.ng Yong Hu hui w.ng China Institute of Atomic Energy Beijing 102413China Sino‑French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China School of Pow.r and Mechanical Engineering Wuhan UniversityWuhan 430072China

Experimental scratch tests and first-principles calculations w.re used to investigate the adhesion property of AlCrNbSiTi high-entropy alloy(HEA)coatings on zirconium *** HEA and Cr coatings w.re deposited on Zr alloy substrates using multi-arc ion plating technology,and scratch tests w.re subsequently conducted to estimate the adhesion property of the *** results indicated that Cr coatings had better adhesion strength than HEA coatings,and the HEA coatings show.d *** special quasi-random structure approach w.s used to build HEA models,and Cr/Zr and HEA/Zr interface models w.re employed to investigate the cohesion betw.en the coatings and Zr substrate using first-principles *** calculated interface energies show.d that the cohesion betw.en the Cr coating and the Zr substrate w.s stronger than that of the HEA coating w.th *** contrary to Al or Si in the HEA coating,Cr,Nb,and Ti atoms binded strongly w.th Zr *** on the calculated elastic constants,it w.s found that low.Cr and high Al content decreased the mechanical performances of HEA ***,this study demonstrated the utilization of a combined approach involving first-principles calculations and experimental studies for future HEA coating development.

关键词： High-entropy alloy coating Cr coating Adhesion property Scratch test First-principles calculation

Americium/lanthanide separation enabled by a distinct polyoxometalate cluster

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Science China Chemistry 2024年第1期67卷 312-313页

作者： hui Yang Xiangke w.ng Shengqian Ma College of Environmental Science and Engineering North China Electric Power UniversityBeijing 102206P.R.China Department of Chemistry University of North TexasDentonTexas 76201United States

Nuclear energy is view.d as a low.carbon-emission electricity-generating technology w.th high-energy density,w.ich has attracted extensive attention and show. broad development prospects[1].How.ver,to ensure sustainability and cleanability in the development of nuclear energy,one crucial challenge is to exploit efficient and economical technologies to simultaneously recover fissionable nuclides from nuclear w.ste and separate long-lived toxic fission products[2].

关键词： lanthanide separation cluster