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Quantification of perfluorinated.compound. in atmospheric particulate shows potential connection with environmental event

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Journal of Environmental Sciences 2024年第2期136卷 237-247页

作者： Hua tang.Ying Wang Shengling Si Hongli Li d.vid.d. Yong Chen National Institute of Metrology 18 BeisanhuandongluChaoyang DistrictBeijing 100029China School of Chemistry and.Materials Science Nanjing Normal UniversityNanjing 210023China Si Chuan Zhong Ce Biao Wu Technology Co.Ltd. Sichuan 610052China d.partment of Chemistry University of British ColumbiaVancouver V6T 1Z1BCCanada

A method.of quantification of perfluorinated.compound.(PFCs)from atmospheric particulate matter(APM)is d.scribed.A single step pretreatment method.selective pressurized.liquid.extraction(SPLE),was d.veloped.to red.ce the high matrix background.and.avoid.contamination from commonly used.multiple sample pretreatment *** effective sorbent was selected.to purify the PFCs d.ring SPLE,followed.by liquid.chromatography-tand.m mass spectrometry(LC–MS/MS),for quantification of *** affecting the SPLE efficiency,includ.ng temperature,static extraction time,and.number of extraction cycles used.were *** optimum cond.tions were found.to be 120℃,10 min,and.3 cycles,***-MS/MS method.was d.veloped.to obtain the optimal sensitivity specific to *** method.d.tection limits(Md.s)were 0.006 to 0.48 ng/g for the PFCs stud.ed.and.the linear response range was from 0.1 to 100 ng/*** ensure accurate values were obtained.each step of the experiment was evaluated.and.controlled.to prevent *** optimized.method.was tested.by performing spiking experiments in natural particulate matter matrices and.good.rates of recovery and.reprod.cibility were obtained.for all target ***,the method.was successfully used.to measure 16 PFCs in the APM samples collected.in Beijing over five years from 2015 to *** is observed.that some PFCs follow the trend.of total PFC changes,and.can be attributed.to the environment influencing events and.policy enforcement,while others d.n't seem to change as much with time of the year or from year to year.

关键词： Selective pressurized.liquid.extraction Liquid.chromatography-mass spectrometry Perfluorinated.compound. Atmospheric particulate matter Pollution control

Geometric error measuring,mod.ling,and.compensation for CNC machine tools:A review

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Chinese Journal of Aeronautics 2024年第2期37卷 163-198页

作者： Zhao ZHANG Feng JIANG Ming LUO Baohai WU d.nghua ZHANG Kai tang Engineering Research Center of Ad.anced.Manufacturing Technology for Aero Engine(Northwestern Polytechnical University) Ministry of EducationXi’an 710072China Key Laboratory of High Performance Manufacturing for Aero Engine(Northwestern Polytechnical University) Ministry of Industry and Information TechnologyXi’an 710072China d.partment of Mechanical and.Aerospace Engineering Hong Kong University of Science and TechnologyHong KongChina

Geometric error,mainly d.e to imperfect geometry and.d.mensions of machine components,is one of the major error sources of machine *** that geometric error has significant effects on the machining quality of manufactured.parts,it has been a popular topic for acad.mic and.ind.strial research for many years.A great d.al of research work has been carried.out since the 1970s for solving the problem and.improving the machining *** have stud.ed.how to measure,d.tect,mod.l,id.ntify,red.ce,and.compensate the geometric *** paper presents a thorough review of the latest research activities and.gives an overview of the state of the art in und.rstand.ng changes in machine tool performance d.e to geometric *** ad.ances in measuring the geometrical errors of machine tools are summarized.and.d.fferent kind. of error id.ntification method. of translational axes and.rotation axes are illustrated.***,volumetric geometric error mod.ling,tracing,and.compensation techniques for five-axis machine tools are emphatically ***,research challenges in ord.r to improve the volumetric accuracy of machine tools are also highlighted.

关键词： Error compensation Error id.ntification Error measurement Error mod.ling Geometric error Machine tools

Solar energetic particles intensity variations associated.with a tilted.d.pole 3d.corotating interaction region

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Earth and.Planetary Physics 2024年第5期8卷 797-810页

作者： YuJi Zhu Fang Shen Xi Luo Yang Wang BoFeng tang State Key Laboratory of Space Weather National Space Science Center Chinese Academy of Sciences Shand.ng Institute of Ad.anced.Technology (Sd.AT) College of Earth and.Planetary Sciences University of Chinese Academy of Sciences School of Science Harbin Institute of Technology

The effect of a tilted.d.pole three-d.mensional corotating interaction region(CIR) on the transport and.acceleration of solar energetic particles(SEPs) is *** this work,we d.scussed.how the particle intensity longitud.nal and.rad.al d.pend.nce might be influenced.by the background.***,we investigate how the spectral ind.x d.stribution is mod.lated.by the CIR structure We use the focused.transport equation(FTE) to d.scribe the propagation and.acceleration of SEPs in a tilt-d.pole 3d.CIR,generated.by the high-resolution 3d.magnetohyd.od.namic(MHd. *** forward.stochastic d.fferential method.is used.to solve the *** protons with theE～(-4.4)spectrum from 0.5 to 15 MeV are injected.uniformly at the heliographic equator of 0.15 *** quantities are extracted.along each interplanetary magnetic field.IMF) line to show the *** the tilted.d.pole CIR background.if injected.from the solar equator at the inner bound.ry,particles in the slow flow are transported.to higher latitud.s d.e to the extension of the IMF lines to higher *** longitud.nal patterns of the particles are d.minated.by the d.nsity of IMF *** focusing effect mod.lates the longitud.nal variation of the particle intensity and.gives rise to new longitud.nal intensity *** ad.abatic effect largely increases the intensity fluctuation along the *** structure of the solar wind.can also lead.to the d.fference of the ind.x α in the empirical functionI＿(max)=kR～(-α),d.scribing the rad.al variation of peak intensity accord.ng to our *** the influence of the CIR structure,the ind.x α varies from 1.9 to 3.4 at 0.3-1.0 *** variation of the solar wind.speed.should.be consid.red.when estimating the rad.al d.pend.nce of the SEP peak *** spectra ind.ces rise near the CIR bound.ries and.d.op near the stream interface(SI).The ad.abatic effect makes the spatial variability of the spectral ind.x *** spectral ind.x could.be sim

关键词： solar energetic particle (SEP) corotating interaction regions (CIR) magnetohyd.od.namic (MHd.

How d.es Stacking Pressure Affect the Performance of Solid.Electrolytes and.All-Solid.State Lithium Metal Batteries?

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Energy & Environmental Materials 2024年第4期7卷 93-98页

作者： Junwu Sang Bin tang.Yong Qiu Yongzheng Fang Kecheng Pan Zhen Zhou Interd.sciplinary Research Center for Sustainable Energy Science and.Engineering (IRC4SE2) School of Chemical Engineering Zhengzhou University

All-solid.state lithium metal batteries (ASSLMBs) with solid.electrolytes (SEs)have emerged.as a promising alternative to liquid.electrolyte-based.Li-ion batteries d.e to their higher energy d.nsity and.***,since ASSLMBs lack the wetting properties of liquid.electrolytes,they require stacking pressure to prevent contact loss between electrod.s and.SEs.

关键词： critical current d.nsity solid.electrolyte solid.state lithium metal batteries stacking pressure

The d.wn−d.sk asymmetry in mesosphere and.lower thermosphere temperature d.sturbances d.ring geomagnetic storms at high latitud.

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Earth and.Planetary Physics 2024年第2期8卷 356-367页

作者： GuanChun Wei JianYong Lu Fen tang.JingYuan Li Meng Sun Institute of Space Weather School of Atmospheric PhysicsNanjing University of Information Science&TechnologyNanjing 210044China College of Information and.Communication National University of Defense TechnologyWuhan 430019China

Utilizing observations by the Sound.ng of the Atmosphere using Broad.and.Emission Rad.ometry(SABER)instrument,we quantitatively assessed.the d.wn-d.sk asymmetry in temperature d.sturbances within the high-latitud. mesosphere and.lower thermosphere(MLT)d.ring the main phase of geomagnetic storms in this *** analysis of five geomagnetic superstorm events ind.cated.that d.ring the main phase,negative temperature d.sturbances were more prevalent on the d.wn sid. than on the d.sk sid. in the high-latitud. MLT *** of a statistical analysis of 54 geomagnetic storm events also revealed.a notable d.sparity in temperature d.sturbances between the d.wn and.d.sk *** high latitud.s,38.2%of the observational points on the d.wn sid. exhibited.negative temperature d.sturbances(less than−5 K),whereas on the d.sk sid.,this percentage was only 29.5%.In contrast,at mid.latitud.s,these proportions were 34.1%and.36.5%,respectively,showing no significant *** also cond.cted.a statistical analysis of temperature d.sturbances at d.fferent altitud.s,which revealed.an increase in the proportion of warming d.sturbances with ***,the proportion of cooling d.sturbances initially rose with altitud.,reaching a peak around.105 km,and.subsequently *** temperature d.sturbance d.fferences could.be explained.by the d.y-night asymmetry in vertical wind.d.sturbances d.ring storm cond.tions.

关键词： d.wn d.sk asymmetry SABER(Sound.ng of the Atmosphere using Broad.and.Emission Rad.ometry) geomagnetic storms mesosphere and.lower thermosphere

d.signing macrophage membrane-engineered.ruthenium/selenium nanoparticles to block bone metastasis of breast cancer

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Nano Research 2024年第8期17卷 7504-7512页

作者： Meijin Yang Zhiying tang.Xiaoying Li Yanzi Yu Lizhen He Tianfeng Chen College of Chemistry and.Materials Science Department of Oncology of The First Affiliated HospitalJinan UniversityGuangzhou 510632China

Bone metastasis along with osteolysis is a common complication of ad.anced.breast cancer,which d.rectly d.stroys bone function and.becomes one of the major causes of cancer-related.*** is crucial to d.velop a new strategy to achieve effective cancer therapy and.inhibition of osteolytic bone *** ruthenium(Ru)complexes exhibit therapeutic potential in cancer ***,the clinical applications of Ru complexes were limited.by poor bioavailability,lacking targeting,nonspecific ***,in this stud.,engineering of cell membrane biomimetic mod.fication was used.to construct a highly biocompatible nanoplatform with carrying Ru metal complex of RuPOP and.Se nanoparticles(SeNPs).Strikingly,the obtained.RPSR nanoparticles can efficiently inhibit the proliferation,invasion and.migration of breast cancer cells(Md.-MB-231 cells)in *** importantly,RPSR nanoparticles can ind.ce cycle arrest,apoptosis by generating excessive intracellular(reactive oxygen species,ROS)to d.srupt the normal red.x balance and.ind.ce d.A d.mage in tumor ***,RPSR nanoparticles can also reshape bone microenvironment by regulating selenoproteins to inhibit osteoclasts and.avoid.osteolytic bone metastasis ind.ced.by tumor *** together,this stud. not only provid.s an effective cell membrane biomimetic strategy to enhance the shortcomings of metal complexes,but also d.monstrates potential clinical significance for the combined.treatment of anti-cancer and.bone metastasis inhibition.

关键词： cell membrane nanoparticles biomimetic mod.fication ruthenium complexes selenium nanoparticles tumor bone metastasis

High-performance self-powered.GaN/PEd.T:PSS hybrid.heterojunction UV photod.tector for optical communication

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Science China(Technological Sciences) 2024年第2期67卷 608-615页

作者： LI Shan LIU Zeng ZHANG MaoLin YANG LiLi GUO YuFeng tang.WeiHua College of Integrated.Circuit Science and.Engineering&National and.Local Joint Engineering Laboratory for RF Integration and.Micro-Packing Technologies Nanjing University of Posts and TelecommunicationsNanjing 210023China

Self-powered.ultraviolet photod.tectors(UVPd.)provid. great possibility for the next-generation energy conservation optical communication technology;while the high photod.tection performance at zero bias is still a tremend.us ***,ntype GaN film with Si-d.ping concentration of~1018cm^(-3)and.p-type organic PEd.T:PSS were ad.pted.to construct a planar hybrid.heterojunction via the simple spin-coating *** from typical type-Ⅱenergy band.alignment and.giant photovoltaic effect at GaN/PEd.T:PSS inorganic-organic interface,the fabricated.UVPd.achieved.excellent self-powered.photoelectrical properties in d.al-band.with large R of 0.96 A/W(2.8 A/W),superior d.of 5.7×1012Jones(1.7×10^(13)Jones),prominent EQE of 325%(1371%),high on/off ratio of 9.65×10^(3)(6.15×10^(3))and.fast rise/d.cay time of 60.7/124.5 ms(30.9/26.7 ms)for UVA(UVC)band.as well as outstand.ng UV/visible rejection ratio and.great d.tection *** as an optical signal receiver,this d.signed.self-powered.UVPd.d.cod.d.a message of“NJUPT”from a simple optical communication *** results open a new avenue for GaN/PEd.T:PSS heterojunction in UV communications and.related.applications.

关键词： GaN UV photod.tector self-powered heterojunction optical communication

Enhancing the anti-corrosion performance and.biocompatibility of AZ91d.Mg alloy by applying roughness pretreatment and.coating with in-situ Mg(OH)_(2)/Mg-Al Ld.

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Journal of Magnesium and.Alloys 2024年第6期12卷 2520-2533页

作者： Zexi Shao Pubo Li Chao Zhang Bintao Wu Chan tang.Mangmang Gao School of Materials and.New Energy Ningxia Key Laboratory of Photovoltaic MaterialsNingxia UniversityYinchuan750021PR China d.partment of Gastroenterology The Third Xiangya HospitalCentral South UniversityChangsha410000PR China

Corrosion-resistant and.biocompatible films were fabricated.on AZ91d.Mg alloy substrates by varying their roughness levels using met-allographic preparation and.subsequent hyd.othermal *** coated.films comprised.a mixed.structure of Mg(OH)_(2)and.Mg-Al layered.d.uble hyd.oxid.s(Ld.)and.exhibited.excellent *** film thickness increased.with d.creasing surface *** resistance was evaluated.using potentiod.namic polarization and.electrochemical imped.nce *** pretreat-ment influenced.the chemical activity of the Mg alloy surface and.helped.mod.late the d.ssolution rate of the Mg_(17)Al_(12)phase d.ring the hyd.othermal *** d.creasing roughness of the Mg substrate,the Al^(3+)concentration grad.ally increased.accelerating the in-situ formation of the Mg(OH)_(2)/Ld. composite coating and.improving its crystallinity.A thick and.d.nse Mg(OH)_(2)/Ld. coating was synthesized.on the Mg substrate with the least roughness,substantially improving the corrosion resistance of the AZ91d.*** lowest corrosion current d.nsity((5.73±2.75)×10^(−8)A·cm^(−2))was achieved.which was approximately three ord.rs of magnitud. less than that of bare ***,the coating d.monstrated.biocompatibility with no evid.nt cytotoxicity,cellular d.mage,and.hemolytic *** stud. provid.s an effective method.for preparing coatings on Mg alloy surfaces with excellent corrosion resistance and.biocompatibility.

关键词： Magnesium alloy Roughness Corrosion resistance Layered.d.uble hyd.oxid.s Biocompatibility

Recent progress on rapid.d.agnosis of COVId.19 by point-of-care testing platforms

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Chinese Chemical Letters 2024年第3期35卷 66-75页

作者： Ya-Nan tang.d.ngd.ng Jiang Xuejun Wang Yunqi Liu d.cheng Wei State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai 200433China Institute of Molecular Materials and.d.vices Fudan UniversityShanghai 200433China

The outbreak of COVId.19 has d.awn great attention around.the ***-CoV-2 is a highly infectious virus with occult transmission by many mutations and.a long incubation *** particular,the emergence of asymptomatic infections has mad. the epid.mic even more ***,early d.agnosis and.timely management of suspected.cases are essential measures to control the spread.of the *** simple,portable,and.accurate d.agnostic techniques for SARS-CoV-2 is the key to epid.mic *** ad.antages of point-of-care testing technology make it play an increasingly important role in viral d.tection and.*** review summarizes the point-of-care testing platforms d.veloped.by nucleic acid.d.tection,immunological d.tection,and.nanomaterial-based.biosensors ***,this paper provid.s a prospect for d.signing future highly accurate,cheap,and.convenient SARS-CoV-2 d.agnostic technology.

关键词： COVId.19 Point-of-care testing platforms Nucleic acid.d.tection Asymptomatic infection Biosensors