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38th International Cosmic Ray Conference, ICRC 2023

作者： Abe, Shotaro Berti, Alessio Di Pierro, Federico López-Coto, Rubén Moralejo, Abelardo Ohtani, Yoshiki Sitarek, Julian Strzys, Marcel Suda, Yusuke Vovk, Ievgen Abe, H. Abe, K. Abe, S. Abhir, J. Acciari, V.A. Aguasca-Cabot, A. Agudo, I. Alvarez Crespo, N. Aniello, T. Ansoldi, S. Antonelli, L.A. Aramo, C. Arbet-Engels, A. Cornelia, A. Artero, M. Asano, K. Aubert, P. Baack, D. Babić, A. Baktash, A. Bamba, A. Baquero Larriva, A. Baroncelli, L. Barres de Almeida, U. Barrio, J.A. Batkovic, I. Baxter, J. Becerra González, J. Bednarek, W. Bernardini, E. Bernardos, M.I. Bernete Medrano, J. Berti, A. Besenrieder, J. Bhattacharjee, P. Biederbeck, N. Bigongiari, C. Biland, A. Bissaldi, E. Blanch, O. Bonnoli, G. Bordas, P. Bošnjak, Ž. Bulgarelli, A. Burelli, I. Burmistrov, L. Buscemi, M. Busetto, G. Campoy-Ordaz, A. Cardillo, M. Caroff, S. Carosi, A. Carosi, R. Carrasco, M.S. Carretero-Castrillo, M. Cassol, F. Castro-Tirado, A.J. Cauz, D. Cerasole, D. Ceribella, G. Chai, Y. Cheng, K. Chiavassa, A. Chikawa, M. Chilingarian, A. Chytka, L. Cifuentes, A. Cikota, S. Colombo, E. Contreras, J.L. Cortina, J. Costantini, H. Covino, S. D’Amico, G. Dalchenko, M. D’Elia, V. Da Vela, P. Dazzi, F. De Angelis, A. de Bony de Lavergne, M. De Lotto, B. De Lucia, M. de Menezes, R. Del Peral, L. Deleglise, G. Delfino, M. Delgado, C. Delgado Mengual, J. della Volpe, D. Dellaiera, M. Del Popolo, A. Depaoli, D. Di Piano, A. Di Pierro, F. Di Pilato, A. Di Tria, R. Di Venere, L. Díaz, C. Dominik, R.M. Dominis Prester, D. Donini, A. Dorner, D. Doro, M. Eisenberger, L. Elsässer, D. Emery, G. Escudero, J. Fallah Ramazani, V. Fariña, L. Fattorini, A. Ferrara, G. Ferrarotto, F. Fiasson, A. Foffano, L. Font, L. Freixas Coromina, L. Fröse, S. Fukami, S. Fukazawa, Y. Garcia, E. Garcia López, R. Garczarczyk, M. Gasbarra, C. Gasparrini, D. Gasparyan, S. Gaug, M. Geyer, D. Giesbrecht Paiva, J. Giglietto, N. Giordano, F. Gliwny, P. Godinovic, N. Grau, R. Green, J. Green, D. Gunji, S. Günther, P. Hackfeld, J. Hadasch, D. Hahn, A. Institute for Cosmic Ray Research Kashiwa-no-ha 5-1-5 Kashiwa-shi Chiba Japan Max-Planck-Institut für Physik Föhringer Ring 6 München80805 Germany INFN Sezione di Torino Via P. Giuria 1 Torino10125 Italy Instituto de Astrofísica de Andalucía-CSIC Glorieta de la Astronomía s/n Granada18008 Spain The Barcelona Institute of Science and Technology Campus UAB Bellaterra Barcelona08193 Spain Faculty of Physics and Applied Informatics University of Lodz ul. Pomorska 149-153 Lodz90-236 Poland Physics Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima739-8526 Japan Institute for Cosmic Ray Research University of Tokyo Japan Department of Physics Tokai University Japan ETH Zürich Switzerland Instituto de Astrofísica de Canarias Departamento de Astrofísica Universidad de La Laguna Spain Departament de Física Quàntica i Astrofísica Institut de Ciències del Cosmos Universitat de Barcelona IEEC-UB Spain EMFTEL department IPARCOS Universidad Complutense de Madrid Spain Italy INFN Sezione di Trieste Università degli Studi di Udine Italy Italy INAF Osservatorio Astronomico di Roma Italy INFN Sezione di Napoli Italy INFN Sezione di Padova Università degli Studi di Padova Italy LAPP Univ. Grenoble Alpes Univ. Savoie Mont Blanc CNRS-IN2P3 Annecy France Department of Physics TU Dortmund University Germany Croatia Universität Hamburg Institut für Experimentalphysik Germany Graduate School of Science University of Tokyo Japan Universidad del Azuay Ecuador INAF Osservatorio di Astrofisica e Scienza dello spazio di Bologna Italy Centro Brasileiro de Pesquisas Físicas Brazil CIEMAT Spain INFN Sezione di Bari Politecnico di Bari Italy INAF Osservatorio Astronomico di Brera Italy University of Geneva Département de physique nucléaire et corpusculaire Switzerland INFN Sezione di Catania Italy Departament de Física CERES-IEEC Universitat Autónoma de Barcelona Spain Italy Università di Pisa INFN Pisa Italy Aix Mars

MAGIC is a system of two Imaging Atmospheric Cherenkov Telescopes (IACTs), designed to detect very-high-energy gamma rays, and is operating in stereoscopic mode since 2009 at the Observatorio del Roque de Los Muchachos in La Palma, Spain. In 2018, the prototype IACT of the Large-Sized Telescope (LST-1) for the Cherenkov Telescope Array, a next-generation ground-based gamma-ray observatory, was inaugurated at the same site, at a distance of approximately 100 meters from the MAGIC telescopes. Using joint observations between MAGIC and LST-1, we developed a dedicated analysis pipeline and established the threefold telescope system via software, achieving the highest sensitivity in the northern hemisphere. Based on this enhanced performance, MAGIC and LST-1 have been jointly and regularly observing the Galactic Center, a region of paramount importance and complexity for IACTs. In particular, the gamma-ray emission from the dynamical center of the Milky Way is under debate. Although previous measurements suggested that a supermassive black hole Sagittarius A* plays a primary role, its radiation mechanism remains unclear, mainly due to limited angular resolution and sensitivity. The enhanced sensitivity in our novel approach is thus expected to provide new insights into the question. We here present the current status of the data analysis for the Galactic Center joint MAGIC and LST-1 observations. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Cosmology

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Molecular-Scale Insights into the Heterogeneous Interactions Between an m-Terphenyl Isocyanide Ligand and Noble Metal Nanoparticles

arXiv

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arXiv 2024年

作者： Bi, Liya Wang, Yufei Wang, Zhe Do, Alexandria Fuqua, Alexander Balto, Krista P. Zhang, Yanning Figueroa, Joshua S. Pascal, Tod A. Tao, Andrea R. Li, Shaowei Department of Chemistry and Biochemistry University of California San DiegoCA92093-0309 United States Program in Materials Science and Engineering University of California San DiegoCA92093-0418 United States Aiiso Department of Chemical and Nano Engineering University of California San DiegoCA92093-0448 United States Department of Physics and Astronomy University of California IrvineCA92697-4575 United States Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu611731 China

The structural and chemical properties of metal nanoparticles are often dictated by their interactions with molecular ligand shells. These interactions are highly material-specific and can vary significantly even among elements within the same group or materials with similar crystal structure. Precise characterization of ligand-metal interactions is crucial for the rational design of ligands and the functionalization of nanoparticles. In this study, we found that the ligation behavior with an m-terphenyl isocyanide molecule differs significantly between Au and Ag nanoparticles, with distinct ligand extraction efficiencies and size dependencies. Surface-enhanced Raman spectroscopy measurements revealed unique enhancement factors for two molecular vibrational modes between two metal surfaces, indicating different ligand binding geometries. Molecular-level characterization using scanning tunneling microscopy allowed us to directly visualize these variations between Ag and Au surfaces, which we assign as two distinct binding mechanisms. This molecular-scale visualization provides clear insights into the different ligand-metal interactions, as well as the chemical behavior and spectroscopic characteristics of isocyanide-functionalized nanoparticles. © 2024, CC BY.

关键词： Ligands

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Mn-corrolazine-based 2D-nanocatalytic material with single Mn atoms for catalytic oxidation of alkane to alcohol

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Chinese Journal of Catalysis 2021年第6期42卷 1030-1039页

作者： Chun Zhu Jin-Xia Liang Yang Meng Jian Lin Zexing Cao School of Chemistry and Chemical Engineering Guizhou UniversityGuiyang 550025GuizhouChina Guizhou Provincial Key Laboratory of Computational Nano-Material Science Guizhou Education UniversityGuiyang 550018GuizhouChina CAS Key Laboratory of Science and Technology on Applied Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina State Key Laboratory of Physical Chemistry of Solid Surfaces and Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 360015FujianChina

Heterogenization of organic-macrocyclic metal catalysts is one of the simplest and most efficient methods for effective separation of products and cyclic application of a *** using an environmentally friendly Mn-corrolazine catalyst as the building unit,which can directly oxidize organic substrates under oxygen atmosphere and mild conditions,we theoretically constructed a novel two-dimensional(2D)Mn-corrolazine nanocatalytic material with high catalytic *** this material,each Mn atom maintains its electronic configuration in the monomer and can directly activate O2 as the single-atom catalyst(SAC)center to form a radical-like[Mn]-O-O under mild visible-light irradiation *** newly generated[Mn]–O–O can efficiently and selectively oxidize C–H bonds to form alcohol species through H-abstraction and the rebound ***,the catalytic reaction is easily regulated by an external electric field along its intrinsic Mn–O–O reaction *** current study provides a theoretical foundation for further experimental studies and practical applications of the Mn-corrolazine-based SAC.

关键词： Single-atom catalyst Heterogenization Two-dimensional nanomaterials First-principles calculations C–H bond activation

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Highly Selective Co2 Electrocatalytic Reduction on Nickel Single-Atom Catalyst in a High-Temperature Shockwave Method

SSRN

引用

SSRN 2022年

作者： Wang, Jiawei Xiao, Guoping Gao, Na Zhou, Jing Xie, Mengna Du, XianLong Wu, Chuanqiang Xi, Shibo Li, Tao Wang, Jian-Qiang Engineering Research Center of Large-Scale Reactor Engineering and Technology Ministry of Education State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai200237 China Key Laboratory of Interfacial Physics and Technology Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai201800 China University of Chinese Academy of Sciences Beijing100049 China Information Materials and Intelligent Sensing Laboratory of Anhui Province Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Institutes of Physical Science and Information Technology Anhui University Hefei230601 China Institute of Chemical and Engineering Sciences A*STAR Singapore627833 Singapore

Recently, the easily prepared catalysis used in CO 2 electrochemical reduction with high selectivity and low cost has attracted more and more attention. Compared with the temperate wet chemical preparation method, which takes a long time and introduces some impurities, we found nickel metal catalysts can be easily and quickly synthesized on carbon black using the high-temperature shockwave method, which has the advantages of rapid heating up to 1300-1500 K within 0.5 s, no introduction of excess elements and extreme low unfavorable nitrogen dopants. Heating cycles and proportion of nitrogen source have been investigated on the catalyst morphology, particle size and electrocatalysis performance. Based on operando X-ray absorption and aberration-corrected scanning transmission electron microscopy (STEM) measurements, nickel single atom catalysts (Ni SACs) were prepared successfully and uniformly in modest heating cycles and proportion of nitrogen source. The Ni SACs exhibited remarkable performance in reducing carbon dioxide (CO 2 ) to carbon monoxide (CO), with the current density of 27.5 mA/cm 2 (−1.0 V vs. reversible hydrogen electrode) and CO selectivity approaching 100% in flow cell. © 2022, The Authors. All rights reserved.

关键词： Carbon monoxide

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Wavelength Dependent Photodissociation of OCS via F 3^1ПRydberg State:CO(X1+)+S(1D2)Product Channel

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Chinese Journal of chemical physics 2020年第6期33卷 691-696,I0002页

作者： Fei Xu Yu-xin Tan Dao-fu Yuan Wen-tao Chen Sheng-rui Yu Ting Xie Tao Wang Xue-ming Yang Xing-an Wang Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics School of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230026China Hangzhou Institute of Advanced Studies Zhejiang Normal UniversityHangzhou 311231China State key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China College of Science Sothern University of Science and TechnologyShenzhen 518055China

The vacuum ultraviolet photodissociation of OCS via the F 3^1ΠRydberg states was investigated in the range of 134-140 nm by means of the time-sliced velocity map ion imaging *** images of S(^1D2)products from the CO(X^1Σ^+)+S(^1D2)dissociation channel were acquired at five photolysis wavelengths,corresponding to a series of symmetric stretching vibrational excitations in OCS(F 3^1Π,v1=0-4).The total translational energy distributions,vibrational populations and angular distributions of CO(X^1Σ^+,v)coproducts were *** analysis of experimental results suggests that the excited OCS molecules dissociate to CO(X^1Σ^+)and S(^1D2)products via non-adiabatic couplings between the upper F 3^1Πstates and the lower-lying states both in the C∞v and Cs ***,strong wavelength dependent behavior has been observed:the greatly distinct vibrational populations and angular distributions of CO(X^1Σ^+,v)products from the lower(v1=0-2)and higher(v1=3,4)vibrational states of the excited OCS(F 3^1Π,v1)demonstrate that very different mechanisms are involved in the dissociation *** study provides evidence for the possible contribution of vibronic coupling and the crucial role of vibronic coupling on the vacuum ultraviolet photodissociation dynamics.

关键词： Vacuum ultraviolet photodissociation Carbonyl sulfide Velocity map ion imaging

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Adapting a slit model to determine the aeroacoustic response of tube rows 51

Adapting a slit model to determine the aeroacoustic response...

引用

51st International Congress and Exposition on Noise Control Engineering, Internoise 2022

作者： Surendran, Aswathy Na, Wei Boakes, Charles Yang, Dong Morgans, Aimee S. Boij, Susann Department of Engineering Physics and Computation Technical University of Munich Garching85747 Germany School of Chemical and Physical Sciences Keele University StaffordshireST5 5BG United Kingdom Department of Mechanics and Maritime Sciences Chalmers University of Technology GothenburgSE-41296 Sweden Department of Mechanical Engineering Imperial College London LondonSW7 2AZ United Kingdom Department of Mechanics and Aerospace Engineering Southern University of Science and Technology Shenzhen518055 China KTH Royal Institute of Technology Marcus Wallenberg laboratory for Sound and Vibration Research Dept. of Engineering Mechanics StockholmSE-10044 Sweden

ISBN: (纸本)9781906913427

Cylindrical tubes in cross-flow, like the ones found in heat exchangers, are excellent acoustic dampers and as such have the potential to mitigate thermoacoustic instabilities. Flow separation and vortex shedding downstream of the tube row are key to significantly enhancing sound attenuation. However, constructing an analytical solution for the aeroacoustic response of tube rows in cross-flow is very challenging owing to the complex flow structure, vortex shedding and coupling with acoustics. To overcome this, we propose the adaptation of a slit model for tube row acoustic scattering (aeroacoustic response) predictions at low Strouhal numbers. The slit model was modified such that the loss coefficients across the slit and the tube row matches. The model is then validated against numerical predictions using Linearised Navier Stokes Equations and experimental measurements. The predictions for both magnitude and phase for transmission and reflection coefficients agree well with the simulations and experiments. © 2022 Internoise 2022 - 51st International Congress and Exposition on Noise Control Engineering. All rights reserved.

关键词： Vortex shedding

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Electric Field Emission in GdNiO3 Microflower

SSRN

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SSRN 2024年

作者： Karmakar, Subrata Parey, Vanshree Mistari, Chetan D. Hamid, Md Abdul Emu, Injamamul Hoque Halim, Md Abdul Sanyal, Gopal Chakraborty, Brahmananda More, M.A. Droopad, Ravi Haque, Ariful Ingram School of Engineering Texas State University San MarcosTX78666 United States Institute of Chemical Research of Catalonia The Barcelona Institute of Science and Technology Av. Països Catalans 16 Tarragona43007 Spain Department of Physics Savitribai Phule Pune University Maharashtra Pune411007 India Mechanical Metallurgy Division Bhabha Atomic Research Centre Trombay Mumbai400085 India High Pressure and Synchrotron Radiation Physics Division Bhabha Atomic Research Centre Trombay Mumbai400085 India Homi Bhabha National Institute Anushaktinagar Mumbai400094 India Materials Science Engineering & Commercialization Program Texas State University San MarcosTX78666 United States

GdNiO3 microflowers were synthesized by hydrothermal method with unit sizes of about 2.2-3.5 μm and petal sizes of ~75-100 nm. The X-ray diffraction pattern (XRD) and Raman spectra reveal an orthorhombic crystal structure with the space group Pbnm and various Raman active vibrational modes i.e., Ag, B1g, B2g associated with rare earth nickelates. The total density of states (TDOS) was calculated by density functional theory (DFT) study using a hybrid functional (HSE06) and the volume of TDOS near the Fermi level confirms the semiconducting nature of GdNiO3 with band gap ~0.688 eV. The local bulk work function (φ) was estimated theoretically at ~5.35 eV from DFT calculations which is one of the essential parameters for the field enhancement factor (β). Field emission current density (J) vs. applied electric field (E) divulges a low turn-on field (Eto)~4.6 V/μm@1 μA/cm2 and a threshold field (Eth)~5.2 V/μm@10 μA/cm2 respectively. The Fowler-Nordheim (F-N) model was introduced to calculate β ~1637 and long-term field emission current stability was observed experimentally > 4 h at the preset values of current 2 μA and 10 μA, respectively. The easy preparedness, low turn-on field, and long-term current stability without significant decay suggest this material to be an efficient electron field emitting material in the rare-earth nickelates series. © 2024, The Authors. All rights reserved.

关键词： Rare earths

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Machine learning identification of organic compounds using visible light

arXiv

引用

arXiv 2022年

作者： Bikku, Thulasi Fritz, Rubén A. Colón, Yamil J. Herrera, Felipe Department of Physics Universidad de Santiago de Chile Av. Victor Jara 3493 Santiago Chile Computer Science and Engineering Vignan's Nirula Institute of Technology and Science for Women Andhra Pradesh Guntur India Department of Chemical and Biomolecular Engineering University of Notre Dame IN United States ANID - Millennium Science Initiative Program Millennium Institute for Research in Optics Concepción Chile

Identifying chemical compounds is essential in several areas of science and engineering. Laser-based techniques are promising for autonomous compound detection because the optical response of materials encodes enough electronic and vibrational information for remote chemical identification. This has been exploited using the fingerprint region of infrared absorption spectra, which involves a dense set of absorption peaks that are unique to individual molecules, thus facilitating chemical identification. However, optical identification using visible light has not been realized. Using decades of experimental refractive index data in the scientific literature of pure organic compounds and polymers over a broad range of frequencies from the ultraviolet to the far-infrared, we develop a machine learning classifier that can accurately identify organic species based on a single-wavelength dispersive measurement in the visible spectral region, away from absorption resonances. The optical classifier proposed here could be applied to autonomous material identification protocols or applications. Copyright © 2022, The Authors. All rights reserved.

关键词： Refractive index

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Publisher's Note: "physically interpretable performance metrics for clustering" [J. Chem. Phys. 161, 244106 (2024)]

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The Journal of chemical physics 2025年第6期162卷 069902页

作者： Kinjal Mondal Jeffery B Klauda Institute for Physical Science and Technology Biophysics Program University of Maryland College Park Maryland 20742 USA. Department of Chemical and Biomolecular Engineering University of Maryland College Park Maryland 20742 USA.

This article was originally published online on 26 December 2024 with errors on page 12 and Refs. 23 and 24. On page 12, last paragraph in the left column, the

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Genetically encoded X-ray cellular imaging for nanoscale protein localization

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National science Review 2020年第7期7卷 1218-1227页

作者： Huating Kong Jichao Zhang Jiang Li Jian Wang Hyun-Joon Shin Renzhong Tai Qinglong Yan Kai Xia Jun Hu Lihua Wang Ying Zhu Chunhai Fan Bioimaging Center Shanghai Synchrotron Radiation FacilityZhangjiang Laboratory Shanghai Advanced Research Institute Chinese Academy of Sciences Division of Physical Biology CAS Key Laboratory of Interfacial Physics and Technology Shanghai Institute of Applied Physics Chinese Academy of Sciences Canadian Light Source Inc. University of Saskatchewan Pohang Accelerator Laboratory POSTECH School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative Molecules and Shanghai Key Laboratory for Nucleic Acids Chemistry and NanomedicineInstitute of Molecular Medicine Renji Hospital School of Medicine Shanghai Jiao Tong University

Spatial resolution defines the physical limit of microscopes for probing biomolecular localization and interactions in cells. Whereas synchrotron-based X-ray microscopy(XRM) represents a unique approach for imaging a whole cell with nanoscale resolution due to its intrinsic nanoscale resolution and great penetration ability, existing approaches to label biomolecules rely on the use of exogenous tags that are multi-step and error-prone. Here, we repurpose engineered peroxidases as genetically encoded X-ray-sensitive tags(GXET) for site-specific labeling of protein-of-interest in mammalian cells. We find that 3,3-diaminobenzidine(DAB) polymers that are in-situ catalytically formed by fusion-expressed peroxidases are visible under XRM. Using this new tag, we imaged the protein location associated with the alteration of a DNA-methylation pathway with an ultra-high resolution of 30 nanometers. Importantly, the excellent energy resolution of XRM enables multicolor imaging using different peroxidase tags. The development of GXET enlightens the way to nanoscopic imaging for biological studies.

关键词： synchrotron-based X-ray microscopy cellular imaging nanoscale protein localization genetically encoded X-ray tags 3,3-diaminobenzidine polymers

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