检索结果-南通市图书馆

Impacts of Indian summer monsoon and stratospheric intrusion on air pollutants in the inland Tibetan Plateau

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2021年第6期12卷 294-298页

作者： Xiufeng Yin Shichang Kang Benjamin de Foy Dipesh Rupakheti Maheswar Rupakheti Zhiyuan Cong Xin Wanb Guoshuai Zhang Qianggong Zhang State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of SciencesBeijing 100101China Department of Earth and Atmospheric Sciences Saint Louis UniversitySt.LouisMO 63108USA Institute for Advanced Sustainability Studies PotsdamGermany Chinese Academy of Environmental Planning Beijing 100012China

Air pollutants can be transported to the pristine regions such as the Tibetan Plateau,by monsoon and stratospheric *** Tibetan Plateau region has limited local anthropogenic emissions,while this region is influenced strongly by transport of heavy emissions mainly from South *** conducted a comprehensive study on various air pollutants (PM_(2.5),total gaseous mercury,and surface ozone) at Nam Co Station in the inland Tibetan *** mean PM_(2.5)concentration at Nam Co peaked in April before monsoon season,and decreased during the whole monsoon season (June–September).Monthly mean total gaseous mercury concentrations at Nam Co peaked in July and were in high levels during monsoon *** Indian summer monsoon acted as a facilitator for transporting gaseous pollutants (total gaseous mercury) but a suppressor for particulate pollutants (PM_(2.5)) during the monsoon *** from both PM_(2.5)and total gaseous mercury variabilities,surface ozone concentrations at Nam Co are primarily attributed to stratospheric intrusion of ozone and peaked in *** effects of the Indian summer monsoon and stratospheric intrusion on air pollutants in the inland Tibetan Plateau are complex and require further studies.

关键词： Tibetan Plateau Nam Co PM_(2.5) Total gaseous mercury Surface ozone

Investigating color screening in proton-nucleus collisions with complex potentials

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2022年第11期46卷 203-211页

作者： Liuyuan Wen Xiaojian Du Shuzhe Shi Baoyi Chen Department of Physics Tianjin UniversityTianjin 300350China Fakultat fur Physik Universitat BielefeldD-33615 BielefeldGermany Center for Nuclear Theory Department of Physics and AstronomyStony Brook UniversityStony BrookNew York11784USA

Color screening and parton inelastic scattering modify the heavy-quark antiquark potential in mediums consisting of particles from quantum chromodynamics(QCD),leading to the suppression of quarkonium production in relativistic heavy-ion *** to the small charm/anti-charm(cc)pair production number in proton-nucleus(pA)collisions,the correlation between different cc pairs is negligible,which makes the Schrödinger equation viable for tracking the evolution of only one cc *** employ the time-dependent Schrödinger equation with an in-medium cc potential to study the evolution of charmonium wave functions in a hydrodynamic-like QCD medium produced in pA *** explore different parametrizations of real and imaginary parts of the cc potential and calculate the nuclear modification factors(R_(pA))of J/ψ and ψ(2S)in √s_(NN)=5.02 TeV energy p-Pb collisions at the Large Hadron Collider(LHC).Comparing strong and weak screening scenarios with experimental data in this approach,we arrive at the conclusion that color screening is weak at temperatures close to the deconfined phase ***,the imaginary part of the potential is crucial in describing the experimental data,which is consistent with widely studied semi-classical approaches,where dissociation rates are essential.

关键词： heavy-ion collision quarkonium dissociation quark-gluon plasma Schrödinger equation

Achieving work hardening by forming boundaries on the nanoscale in a Ti-based metallic glass matrix composite

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第15期47卷 192-203页

作者： Jing Fan Wei Rao Junwei Qiao PKLiaw Daniel Sopu Daniel Kiener Jürgen Eckert Guozheng Kang Yucheng Wu College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan030024China Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan030024China Key Laboratory of Advanced Technologies of Materials School of Mechanics and EngineeringSouthwest Jiaotong UniversityMinistry of Education of ChinaChengdu610031China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN37996-2200USA Technische Universitat Darmstadt Institut fiir MaterialwissenschaftFachgebiet MaterialmodellierungOtto-Bemdt-Strasse 3D-64287DarmstadtGermany Erich Schmid Institute of Materials Science Austrian Academy of SciencesJahnstra'e 12A-8700LeobenAustria Department of Materials Science Montanuniversitat LeobenJahnstra'e 12A-8700LeobenAustria

Achieving work hardening in metallic glass matrix composites(MGMCs) is the key to the extensive use of these attractive materials in structural and functional *** this study,we investigated the formation of nanoscale boundaries resulted from the interaction between matrix and dendrites,which favors the work-hardening deformation in an in-situ Ti41Zr32Ni6 Ta7 Be14 MGMC with β-Ti dendrites in a glassy matrix at room *** microstructures of samples after tension were observed by highresolution transmission electron microscopy(HRTEM) and X-ray diffraction(XRD).The work-hardening mechanism of the present composites involves:(1) appearance of dense dislocation walls(DDWs),(2)proliferation of shear bands,(3) fo rmation of boundaries on the nanoscale,and(4) interactions between hard and soft phases.A theoretical model combined with experimental data reveals the deformation mechanisms in the present work,proving that the in-situ dendrites with outstanding hardening ability in the glass matrix can provide the homogeneous deformation under tensile loading at room temperature.

关键词： Metallic glass matrix composites Plastic deformation Work hardening Dense dislocation walls Nanoscale boundaries

In-situ observations of novel single-atom thick 2D tin membranes embedded in graphene

在线全文

学校读者我要写书评

暂无评论

Nano research 2021年第3期14卷 747-753页

作者： Xiaoqin Yang Huy Q.Ta Wei Li Rafael G.Mendes Yu Liu Qitao Shi Sami Ullah Alicja Bachmatiuk Jinping Luo Lijun Liu Jin-Ho Choi Mark H.Rummeli School of Energy and Power Engineering Xi’an Jiaotong UniversityNo.28Xianning West RoadXian710049China

There is ongoing research in freestanding single-atom thick elemental metal patches,including those suspended in a two-dimensional(2D)material,due to their utility in providing new structural and energetic insight into novel metallic 2D *** pores have shown promise as support systems for suspending such *** study explores the potential of Sn atoms to form freestanding stanene and/or Sn patches in graphene *** atoms were deposited on graphene,where they formed novel single-atom thick 2D planar clusters/patches(or membranes)ranging from 1 to 8 atoms within the graphene *** of three or more atoms adopted either a star-like or close-packed structural *** functional theory(DFT)calculations were conducted to look at the cluster configurations and energetics(without the graphene matrix)and were found to deviate from experimental observations for 2D patches larger than five *** was attributed to interfacial interactions between the graphene pore edges and Sn *** presented findings help advance the development of single-atom thick 2D elemental metal membranes.

关键词： in-situ transmission electron microscopy Sn atoms planar cluster graphene vacancy

The Halo Concentration and Mass Relation Traced by Satellite Galaxies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

research in Astronomy and Astrophysics 2022年第12期22卷 292-298页

作者： Qing Gu Qi Guo Tianchi Zhang Wenting Wang Quan Guo Liang Gao Key Laboratory for Computational Astrophysics National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China Beijing Planetarium Beijing Academy of Science and TechnologyBeijing 100044China Department of Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Shanghai Key Laboratory for Particle Physics and Cosmology Shanghai 200240China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China Institute of Computational Cosmology Department of PhysicsUniversity of DurhamScience LaboratoriesSouth RoadDurham DH13LEUK

We study the relation between halo concentration and mass(c-M relation) using galaxy catalogs of the Seventh and Eighth Data Releases of the Sloan Digital Sky Survey(SDSS DR7 and DR8). Assuming that the satellite galaxies follow the distribution of dark matter, we derive the halo concentration by fitting the satellite radial profile with a Nararro Frank and White(NFW) format. The derived c-M relation covers a wide halo mass range from10^(11.6)to 10^(14.1)M_(⊙). We confirm the anti-correlation between the halo mass and concentration as predicted in cosmological simulations. Our results are in good agreement with those derived using galaxy dynamics and gravitational lensing for halos of 10^(11.6)– 10^(12.9)M_(⊙), while they are slightly lower for halos of 10^(12.9)– 10^(14.1)M_(⊙).This is because blue satellite galaxies are less concentrated, especially in the inner regions. Instead of using all satellite galaxies, red satellites could be better tracers of the underlying dark matter distribution in galaxy groups.

关键词： galaxies:halos galaxies:evolution galaxies:abundances

Graphene transfer methods: A review

在线全文

学校读者我要写书评

暂无评论

Nano research 2021年第11期14卷 3756-3772页

作者： Sami Ullah Xiaoqin Yang Huy Q.Ta Maria Hasan Alicja Bachmatiuk Klaudia Tokarska Barbara Trzebicka Lei Fu Mark H.Rummeli College of Energy Soochow Institute for Energy and Materials InnovationsKey Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou215006China School of Energy and Power Engineering Xi’an Jiaotong UniversityXi’an710049China Institute for Complex Materials IFW Dresden20 Helmholtz StrasseDresden01069Germany NUTECH School of Applied Sciences&Humanities and Computer Engineering DepartmentNational University of TechnologyIslamabad42000Pakistan Centre of Polymer and Carbon Materials Polish Academy of SciencesM.Curie-Sklodowskiej 34Zabrze41-819Poland College of Chemistry and Molecular Science Wuhan UniversityWuhan430072China Institute of Environmental Technology VŠB-Technical University of Ostrava17.listopadu 15Ostrava70833Czech Republic

Graphene is a material with unique properties that can be exploited in electronics, catalysis, energy, and bio-related fields. Although, for maximal utilization of this material, high-quality graphene is required at both the growth process and after transfer of the graphene film to the application-compatible substrate. Chemical vapor deposition (CVD) is an important method for growing high-quality graphene on non-technological substrates (as, metal substrates, e.g., copper foil). Thus, there are also considerable efforts toward the efficient and non-damaging transfer of quality of graphene on to technologically relevant materials and systems. In this review article, a range of graphene current transfer techniques are reviewed from the standpoint of their impact on contamination control and structural integrity preservation of the as-produced graphene. In addition, their scalability, cost- and time-effectiveness are discussed. We summarize with a perspective on the transfer challenges, alternative options and future developments toward graphene technology.

关键词： high-quality transfer application-compatible substrate graphene technology

High-accuracy thermodynamic properties to the melting point from ab initio calculations aided by machine-learning potentials

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2023年第1期9卷 2310-2321页

作者： Jong Hyun Jung Prashanth Srinivasan Axel Forslund Blazej Grabowski Institute for Materials Science University of StuttgartPfaffenwaldring 5570569 StuttgartGermany

Accurate prediction of thermodynamic properties requires an extremely accurate representation of the free-energy *** are twofold—first,the inclusion of the relevant finite-temperature mechanisms,and second,a dense volume–temperature grid on which the calculations are performed.A systematic workflow for such calculations requires computational efficiency and reliability,and has not been available within an ab initio framework so ***,we elucidate such a framework involving direct upsampling,thermodynamic integration and machine-learning potentials,allowing us to incorporate,in particular,the full effect of anharmonic *** improved methodology has a five-times speed-up compared to state-of-the-art *** calculate equilibrium thermodynamic properties up to the melting point for bcc Nb,magnetic fcc Ni,fcc Al,and hcp Mg,and find remarkable agreement with experimental data.A strong impact of anharmonicity is observed specifically for *** introduced procedure paves the way for the development of ab initio thermodynamic databases.

关键词： harmonic point prediction

Connection of the prefabricated updeck of road tunnels by a short lap-spliced joint using ultra-high-performance fiber-reinforced concrete

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

结构与土木工程前沿:英文版 2023年第6期17卷 870-883页

作者： Hui WANG Yong YUAN Junnan QIU Yuan XUE Guangzhou XIE Qian CHENG Yuanchao DING Qing AI School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China College of Civil Engineering Tongji UniversityShanghai200092China Shanghai Chengtou Highway Group Co. Ltd.Shanghai200336China Shanghai Shentong Metro Group Co. Ltd.Shanghai201103China

Prefabricated internal structures of road tunnels,consisting of precast elements and the connections between them,provide advantages in terms of quality control and manufacturing ***,the limited construction space in tunnels creates challenges for on-site *** identify feasible connecting joints,flexural tests of precast straight beams connected by welding-spliced or lap-spliced reinforcements embedded in normal concrete or ultra-high-performance fiber-reinforced concrete(UHPFRC)are first performed and *** an improvement in the strength grade of the closure concrete for the lap-spliced joint,the failure of the beam transforms from a brittle splitting mode to a ductile flexural *** beam connected by UHPFRC100 with short lap-spliced reinforcements can achieve almost equivalent mechanical performance in terms of the bearing capacity,ductility,and stiffness as the beam connected by normal concrete with welding-spliced *** favorable solution is then applied to the connection of neighboring updeck slabs resting on columns in a double-deck *** applicability is validated by flexural tests of T-shaped joints,which,fail in a ductile fashion dominated by the ultimate bearing capacity of the precast elements,similar to the corresponding straight *** utilization of UHPFRC significantly reduces the required lap-splice length of reinforcements owing to its strong bonding strength.

关键词： UHPFRC prefabricated updeck road tunnel lap-spliced rebars flexural tests

Largely Suppressed Magneto-Thermal Conductivity and Enhanced Magneto-Thermoelectric Properties in PtSn_(4)

在线全文

学校读者我要写书评

暂无评论

research 2020年第1期2020卷 769-776页

作者： Chenguang Fu Satya NGuin Thomas Scaffidi Yan Sun Rana Saha Sarah JWatzman Abhay KSrivastava Guowei Li Walter Schnelle Stuart SPParkin Claudia Felser Johannes Gooth Max Planck Institute for Chemical Physics of Solids 01187 DresdenGermany Department of Physics University of CaliforniaBerkeleyCA 94720USA Department of Physics University of TorontoTorontoOntario M5S 1A7Canada Max Planck Institute of Microstructure Physics 06120 HalleGermany Department of Mechanical and Materials Engineering University of CincinnatiCincinnatiOH 45219USA Institute of Physics Martin Luther University Halle-Wittenberg06120 HalleGermany

Highly conductive topological semimetals with exotic electronic structures offer fertile ground for the investigation of the electrical and thermal transport behavior of ***,we find that the layer-structured Dirac semimetal PtSn4 exhibits a largely suppressed thermal conductivity under a magnetic *** low temperatures,a dramatic decrease in the thermal conductivity of PtSn4 by more than two orders of magnitude is obtained at 9 ***,PtSn_(4)shows both strong longitudinal and transverse thermoelectric responses under a magnetic *** power factor and Nernst power factor of approximately 80-100μW·cm^(-1)·K^(-2)are obtained around 15K in various magnetic *** a result,the thermoelectric figure of merit zT is strongly enhanced by more than 30 times,compared to that without a magnetic *** work provides a paradigm for the decoupling of the electron and hole transport behavior of highly conductive topological semimetals and is helpful for developing topological semimetals for thermoelectric energy conversion.

关键词： field particles topological