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Features of ^(90)Sr behavior in Crimean lakes with different salinity of their water environment

Acta Geochimica 2023年第1期42卷 89-102页

作者： n.yu.mirzoeva S.I.Arkhipova V.yu.Proskurnin O.n.Miroshnichenko I.n.Moseichenko A.O.Kovalevsky Institute of Biology of the Southern Seas of RAS SevastopolRussian Federation

The comparative study of technogenic ^(90)Sr behavior features in Crimea lakes’ ecosystems with different levels of salinity was carried out in *** sources of ^(90)Sr input were identified for all the studied lakes:the primary source concerned with atmospheric fallout immediately after the Chernobyl nPP accident and the secondary long-term input of this radionuclide by *** half-life of the ^(90)Sr concentration in the water of the hypers aline Lake Sasyk-Sivash was estimated to vary from 0.8 to 1.1 years after the closure of the north Crimean Canal(nCC).Biogeochemical processes in the lake under the absence of the secondary source of the radionuclide input were shown to decrease in the ^(90)Sr residence time in the water column by 131 *** brackish water bodies,a significant factor influencing the radionuclide concentration in ecosystems of lakes was the pH of their water,while for hypers aline lakes the level of water salinity was the main factor determining ^(90)Sr *** concentration of ^(90)Sr in bottom sediments of studied lakes depended mainly on this radionuclide concentration in a water *** ^(90)Sr distribution factors(Kd) for studied lakes’ bottom sediments varied in a range of n·10^(0)÷n·10^(2) for hypersaline lakes and of n·10^(1)÷n·10^(2) for lakes with brackish *** to the closure of the nCC,the ^(90)Sr redistribution took place in lake ecosystems only under the geochemical processes within the water bodies *** results obtained in this work are of particular importance as a starting point or a basis for further radioecological studies of the Crimean inland waters after the reopening of the nCC and the Dnieper waters re-entering the territory of Crimea in 2022after the 8 years of their absence.

关键词： ^(90)Sr Salt lakes Water Bottom sediments Chernobyl nPP accident Crimea

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Mechanistic insight into the synergy between nickel single atoms and nanoparticles on n-doped carbon for electroreduction of CO2

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Journal of Energy Chemistry 2025年第1期100卷 327-336页

作者： Mingdong Sun Wenwen Guan Cailing Chen Chao Wu Xiaoling Liu Biao Meng Tao Chen yu Han Jun Wang Shibo Xi yu Zhou State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University Advanced Membranes and Porous Materials Center Physical Sciences and Engineering Division King Abdullah University of Science and Technology Institute of Sustainability for Chemicals Energy and Environment A*STAR (Agency for Science Technology and Research) College of Materials Science and Engineering Sichuan University

The synergy of single atoms （SAs） and nanoparticles （nPs） has demonstrated great potential in promoting the electrocatalytic carbon dioxide reduction reaction （CO2RR）;however,the rationalization of the SAs/nPs proportion remains one challenge for the catalyst ***,a ni2+-loaded porous poly（ionic liquids）(PIL) precursor synthesized through the free radical self-polymerization of the ionic liquid monomer,1-allyl-3-vinylimidazolium chloride,was pyrolyzed to prepare the ni,n co-doped carbon materials,in which the proportion of ni SAs and nPs could be facilely modulated by controlling the annealing *** catalyst ni-nC-1000 with a moderate proportion of ni SAs and nPs exhibited high efficiency in the electrocatalytic conversion of CO2into *** ni K-edge X-ray absorption near-edge structure （XAnES） spectra and theoretical calculations were conducted to gain insight into the synergy of ni SAs and *** charge transfer from ni nPs to the surrounding carbon layer and then to the ni SAs resulted in the electron-enriched ni SAs active *** the electroreduction of CO2,the coexistence of ni SAs and nPs strengthened the CO2activation and the affinity towards the key intermediate of*COOH,lowering the free energy for the potential-determining*CO2→*COOH step,and therefore promoted the catalysis efficiency.

关键词： Single atom catalyst Synergy effect Carbon catalyst Electrocatalysis

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Sporadic E responds to the 2022 Tonga volcano eruptions recorded by the Meridian Project

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Earth and Planetary Physics 2025年第1期9卷 20-28页

作者： YangYi Sun Tao yu Jin Wang Chi Long School of Geophysics and Geomatics China University of Geosciences(Wuhan)Wuhan 430047China School of Physics and Electronic Science Guizhou Normal UniversityGuizhou 550001China

In this study,ionosonde observations over Fuke(19.5°n,109.1°E),Wuhan(30.5°n,114.4°E),and Mohe(53.5°n,122.3°E)were analyzed to demonstrate the responses of the sporadic E()to the severe atmospheric disturbances caused by the Tonga volcanic eruptions on January 15,*** most prominent signature was the disappearance of the layer after~10:00 UT over Wuhan and Fuke,which was attributed to the vertical drift caused by the *** occurred intermittently after 13:00 UT following the arrival of the tropospheric Lamb *** examine the causal mechanism for the intermittence,we also included data of horizontal winds in the mesosphere and lower thermosphere region recorded by the meteor radars at Wuhan and Mohe in this *** wind disturbances with periods of~20 hours contributed to the formation of the layer in the nighttime on January 15.

关键词： sporadic E Tonga eruptions neutral wind disturbances

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Acute and chronic excitotoxicity in ischemic stroke and late-onset Alzheimer's disease

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neural Regeneration Research 2025年第7期20卷 1981-1988页

作者： Shan Ping yu Emily Choi Michael QJiang Ling Wei Department of Anesthesiology Emory University School of MedicineAtlantaGAUSA Center for Visual and neurocognitive Rehabilitation Atlanta Veterans Affairs Medical CenterDecaturGAUSA

Stroke and Alzheimer's disease are common neurological disorders and often occur in the same *** comorbidity of the two neurological disorders represents a grave health threat to older *** review presents a brief background of the development of novel concepts and their clinical *** activity of glutamatergic n-methyl-D-aspartate receptors and n-methyl-D-aspartate receptor-mediated Ca^(2+)influx is critical for neuronal *** ischemic insult induces prompt and excessive glutamate release and drastic increases of intracellular Ca^(2+)mainly via n-methyl-D-aspartate receptors,particularly of those at the extrasynaptic *** Ca^(2+)-evoked neuronal cell death in the ischemic core is dominated by necrosis within a few hours and days known as acute ***,mild but sustained Ca^(2+)increases under neurodegenerative conditions such as in the distant penumbra of the ischemic brain and early stages of Alzheimer's disease are not immediately toxic,but gradually set off deteriorating Ca^(2+)-dependent signals and neuronal cell loss mostly because of activation of programmed cell death *** on the Ca^(2+)hypothesis of Alzheimer's disease and recent advances,this Ca^(2+)-activated“silent”degenerative excitotoxicity evolves from years to decades and is recognized as a unique slow and chronic *** n-methyl-D-aspartate receptor subunit Glun3A,primarily at the extrasynaptic site,serves as a gatekeeper for the n-methyl-D-aspartate receptor activity and is neuroprotective against both acute and chronic *** stroke and Alzheimer's disease,therefore,share an n-methyl-D-aspartate receptor-and Ca^(2+)-mediated mechanism,although with much different time *** is thus proposed that early interventions to control Ca^(2+)homeostasis at the preclinical stage are pivotal for individuals who are susceptible to sporadic late-onset Alzheimer's disease and Alzheimer's disease-related

关键词： Ca^(2+)hypothesis cognitive deficits hyperactivity late-onset Alzheimer's disease neurodegeneration n-methyl-D-aspartate receptors n-methyl-D-aspartate receptor subunits pathogenesis preventive treatment

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Integration of Electrical Properties and Polarization Loss Modulation on Atomic Fe–n‑RGO for Boosting Electromagnetic Wave Absorption

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nano-Micro Letters 2025年第2期17卷 517-532页

作者： Kaili Zhang yuefeng Yan Zhen Wang Guansheng Ma Dechang Jia Xiaoxiao Huang yu Zhou State Key Laboratory of Precision Welding&Joining of Materials and Structures Harbin Institute of TechnologyHarbin 150001People’s Republic of China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001People’s Republic of China MIIT Key Laboratory of Advanced Structural‑Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001People’s Republic of China

Developing effective strategies to regulate graphene’s conduction loss and polarization has become a key to expanding its application in the electromagnetic wave absorption(EMWA)*** on the unique energy band structure of graphene,regulating its bandgap and electrical properties by introducing heteroatoms is considered a feasible ***,metal-nitrogen doping reduced graphene oxide(M–n-RGO)was prepared by embedding a series of single metal atoms M–n_(4) sites(M=Mn,Fe,Co,ni,Cu,Zn,nb,Cd,and Sn)in RGO using an n-coordination atom-assisted *** composites had adjustable conductivity and polarization to optimize dielectric loss and impedance matching for efficient EMWA *** results showed that the minimum reflection loss(RL_(min))of Fe–n-RGO reaches−74.05 dB(2.0 mm)and the maximum effective absorption bandwidth(EAB_(max))is 7.05 GHz(1.89 mm)even with a low filler loading of only 1 wt%.Combined with X-ray absorption spectra(XAFS),atomic force microscopy,and density functional theory calculation analysis,the Fe–n_(4) can be used as the polarization center to increase dipole polarization,interface polarization and defect-induced polarization due to d-p orbital hybridization and structural ***,electron migration within the Fe further leads to conduction loss,thereby synergistically promoting energy *** study demonstrates the effectiveness of metal-nitrogen doping in regulating the graphene′s dielectric properties,which provides an important basis for further investigation of the loss mechanism.

关键词： Electromagnetic wave absorption Fe-n-RGO Dipole polarization Conduction loss Impedance matching

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Constructing Donor–Acceptor‑Linked COFs Electrolytes to Regulate Electron Density and Accelerate the Li^(+)Migration in Quasi‑Solid‑State Battery

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nano-Micro Letters 2025年第1期17卷 456-471页

作者： Genfu Zhao Hang Ma Conghui Zhang Yongxin Yang Shuyuan yu Haiye Zhu Yongjiang Sun Hong Guo School of Materials and Energy International Joint Research Center for Advanced Energy Materials of Yunnan ProvinceYunnan UniversityKunming 650091People’s Republic of China yunnan yuntianhua Co. LtdR&D CenterKunming 650228People’s Republic of China Southwest United Graduate School Kunming 650091People’s Republic of China

Regulation the electronic density of solid-state electrolyte by donor–acceptor(D–A)system can achieve highly-selective Li^(+)transportation and conduction in solid-state Li metal *** study reports a high-performance solid-state electrolyte thorough D–A-linked covalent organic frameworks(COFs)based on intramolecular charge transfer *** other reported COFbased solid-state electrolyte,the developed concept with D–A-linked COFs not only achieves electronic modulation to promote highly-selective Li^(+)migration and inhibit Li dendrite,but also offers a crucial opportunity to understand the role of electronic density in solid-state Li metal *** introduced strong electronegativity F-based ligand in COF electrolyte results in highlyselective Li^(+)(transference number 0.83),high ionic conductivity(6.7×10^(-4)S cm^(−1)),excellent cyclic ability(1000 h)in Li metal symmetric cell and high-capacity retention in Li/LiFePO_(4)cell(90.8%for 300 cycles at 5C)than substituted C-and n-based *** is ascribed to outstanding D–A interaction between donor porphyrin and acceptor F atoms,which effectively expedites electron transferring from porphyrin to F-based ligand and enhances Li^(+)***,we anticipate that this work creates insight into the strategy for accelerating Li^(+)conduction in high-performance solid-state Li metal batteries through D–A system.

关键词： Electronic modulation engineering Donor-acceptor-linked covalent organic frameworks Quasi-solid-state Li metal battery

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Strong gravitational lensing of blazar gamma-radiation and intergalactic magnetic fields

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Chinese Physics C 2024年第1期48卷 184-191页

作者： yu.n.Eroshenko Institute for nuclear Research of the Russian Academy of Sciences 60th October Anniversary Prospect 7a 117312 MoscowRussi

The influence of intergalactic magnetic fields on the strong gravitational lensing of blazar secondary gamma radiation is ***,two cases of strong gravitational lensing of blazar gamma-radiation are known,where radiation is deflected by galaxies on the line of sight between the blazars and *** magnetic field can affect the movements of electron-positron pairs generated by primary radiation,thereby changing the directions of secondary gamma *** modifies the equation of the gravitational lens and leads to the dependence of the observed signal in the secondary gamma radiation on the energy of photons and magnetic ***,it is possible,in principle,to estimate the intergalactic magnetic fields from the time delay of signals,from the angular position of images(for future high-resolution gamma-ray telescopes)or from the shape of the observed energy *** method is demonstrated by the example of the blazar B0218+*** this case,however,it is not possible to obtain useful constraints due to the large distances to the blazar and lens *** result is only a lower limit on the magnetic field B>2×10^(−17)G,which is weaker than other existing ***,future discoveries of lensed blazars may provide more favorable opportunities for measuring the magnetic fields,especially with the help of a new generation of gamma-ray telescopes such as e-ASTROGAM,GECAM,and SVOM as well as future gamma-ray telescopes with a high angular resolution,∼0.1″.

关键词： gravitational lensing blazar gamma-astronomy intergalactic magnetic fields

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Fabrication of carbon-supported Al2O3 nanoparticles via spontaneous cross-linking to enhance selective hydrogenation of furfural

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Journal of Energy Chemistry 2025年第1期100卷 612-620页

作者： Weiwei yu Xinbao Zhang Hongyu Chen Yanan Wang Shaoguo Li Fucun Chen Zhenni Liu Xiujie Li Xiangxue Zhu State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences

Selective hydrogenation of furfural to furfuryl alcohol is a great challenge in the hydrogenation field due to thermodynamic preference for hydrogenation of C=C over C=***,a novel Al2O3/C-u hybrid catalyst,composed of n-modified dendritic carbon networks supporting Al2O3nanoparticles,was successfully prepared via carbonizing the freeze-dried gel from spontaneous cross-linking of alginate,Al3+and *** obtained carbon-supported Al2O3hybrid catalyst has a high ratio （31%） of Al species in pentahedral-coordinated *** introduction of urea enhances the surface n content,the ratio of pyrrolic n,and specific surface area of catalyst,leading to improved adsorption capacity of C=O and the accessibility of active *** the furfural hydrogenation reaction with isopropyl alcohol as hydrogen donor,Al2O3/C-u catalyst achieved a 90%conversion of furfural with 98.0% selectivity to furfuryl alcohol,outperforming that of commercial γ-***,Al2O3/C-u demonstrates excellent catalytic stability in the recycling tests attributed to the synergistic effect of abundant weak Lewis acid sites and the anchoring effect of the carbon network on *** work provides an innovative and facile strategy for fabrication of carbon-supported Al2O3hybrid catalysts with rich AlVspecies,serving as a high selective hydrogenation catalyst through MPV reaction route.

关键词： Selective hydrogenation Furfural Furfuryl alcohol Cross-linking MPV route

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Modeling OH transport phenomena in cold plasma discharges using the level set method

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Plasma Science and Technology 2019年第5期21卷 121-131页

作者： Wei HAn K n yu Department of Physics City University of Hong KongTat Chee AvenueKowloon TongHong KongPeople's Republic of China Center of Medical Physics and Technology Hefei Institutes of Physical SciencesChinese Academy of SciencesHefei 230031People's Republic of China Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions and School for Radiological and Interdisciplinary Sciences(RAD-X) Soochow UniversitySuzhou 215006People's Republic of China

Cold atmospheric plasmas(CAPs)have attracted considerable interest in the field of plasma *** reactive species such as hydroxyl(OH)species play an important role in applications of *** of OH species towards the target and distribution of these OH species in the plasma plume play an important role in the applications of plasma *** the present work,a computational model was built to simulate the transportation and distribution of OH species in CAP discharges,which was based on the level set method to dynamically track the propagation of plasma carrier gas in air.A reaction term was incorporated for the OH *** OH species tended to diffuse around the main stream of the carrier gas,and thus covered larger radial and axial distances.A CAP discharge onto a skin layer led to the largest accumulation of OH species at the central part of the exposed *** distribution of OH species on the skin was asymmetric,which agreed with *** computational model itself and the obtained results would be useful for future development of plasma medicine.

关键词： cold atmospheric plasmas plasma medicine two-phase flow diffusion level set method

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Structure and property of metal melt Ⅲ—Relationship between kinematic viscosity and size of atomic clusters

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Science China(Physics,Mechanics & Astronomy) 2010年第11期53卷 2054-2058页

作者： POPEL P S KOnSTAnTInOVA n yu Research Center "Melt" Ural State Pedagogical University

The method of crucible rotating oscillation damping was employed to measure the kinematic viscosity of aluminum melt,and the curve of viscosity v versus temperature T from 935 to 1383 K was ***,based on the calculation model of the evolution behavior of atomic clusters in liquid structure,the curve of atomic clusters size d versus temperature was obtained,and the calculated results are in good agreement with the experimental *** analyzing experimental data,it was found that both the viscosity and the size of atomic clusters of aluminum melt are monodrome functions of temperature,and the relation between v(T) and d(T) is a linear function,i.e.,v = v 0 + K·d(T).This relation indirectly verifies the calculation model of the structural information of metal melt,which is of great significance for studying the relation between melt microstructure and macro-physical properties.

关键词： kinematic viscosity atomic cluster linear relation melt structural information model validation

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