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Uncovering diffusive states of the yeast proton pump, Pma1, and how labeling method can change diffusive behavior

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arXiv 2022年

作者： Bailey, Mary Lou P. Pratt, Susan E. Zhang, Yongdeng Hinrichsen, Michael Bewersdorf, Joerg Regan, Lynne J. Mochrie, Simon G.J. Integrated Graduate Program in Physical and Engineering Biology Yale University New HavenCT06511 United States Department of Applied Physics Yale University New HavenCT06511 United States Department of Physics Yale University New HavenCT06511 United States Department of Cell Biology Yale University New HavenCT06511 United States Department of Biomedical Engineering Yale University New HavenCT06511 United States Institute of Quantitative Biology Biochemistry and Biotechnology Center for Synthetic and Systems Biology School of Biological Sciences University of Edinburgh Edinburgh06511 United Kingdom

We present and analyze video-microscopy-based single-particle-tracking measurements of the budding yeast (Saccharomyces cerevisiae) membrane protein, Pma1, fluorescently-labeled either by direct fusion to the switchable fluorescent protein, mEos3.2, or by a novel, light-touch, labeling scheme, in which a 5 amino acid tag is directly fused to the C-terminus of Pma1, which then binds mEos3.2. The diffusivity distributions of these two populations of single particle tracks differ significantly, demonstrating that labeling method can be an important determinant of diffusive behavior. We also applied perturbation expectation maximization (pEMv2) [Physical Review E 94, 052412 (2016)], which sorts trajectories into the statistically-optimum number of diffusive states. For both TRAP-labeled Pma1 and Pma1-mEos3.2, pEMv2 sorts the tracks into two diffusive states: an essentially immobile state and a more mobile state. However, the mobile fraction of Pma1-mEos3.2 tracks is much smaller (∼ 0.1) than the mobile fraction of TRAP-labeled Pma1 tracks (∼ 0.5). In addition, the diffusivity of Pma1-mEos3.2's mobile state is several times smaller than the diffusivity of TRAP-labeled Pma1's mobile state. To critically assess pEMv2's performance, we compare the diffusivity and covariance distributions of the experimental pEMv2-sorted populations to corresponding theoretical distributions, assuming that Pma1 displacements realize a Gaussian random process. The experiment-theory comparisons for both the TRAP-labeled Pma1 and Pma1-mEos3.2 reveal good agreement, bolstering the pEMv2 approach. © 2022, CC BY.

关键词： Diffusion

Spin crossovers and superdiffusion in the one-dimensional Hubbard model

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Physical Review B 2020年第11期102卷 115121-115121页

作者： Michele Fava Brayden Ware Sarang Gopalakrishnan Romain Vasseur S. A. Parameswaran Rudolf Peierls Centre for Theoretical Physics Clarendon Laboratory Oxford OX1 3PU United Kingdom Department of Physics University of Massachusetts Amherst Massachusetts 01003 USA Department of Physics and Astronomy CUNY College of Staten Island Staten Island New York 10314 USA Physics Program and Initiative for the Theoretical Sciences The Graduate Center CUNY New York New York 10016 USA

We use tools from integrability and generalized hydrodynamics to study finite-temperature dynamics in the one-dimensional Hubbard model. First, we examine charge, spin, and energy transport away from half-filling and zero magnetization, focusing on the strong coupling regime where we identify a rich interplay of temperature and energy scales, with crossovers between distinct dynamical regimes. We identify an intermediate-temperature regime analogous to the spin-incoherent Luttinger liquid, where spin degrees of freedom are hot but charge degrees of freedom are at low temperature. We demonstrate that the spin Drude weight exhibits sharp features at the crossover between this regime and the low-temperature Luttinger liquid regime, which are absent in the charge and energy response, and rationalize this behavior in terms of the properties of Bethe ansatz quasiparticles. We then turn to the dynamics along special lines in the phase diagram corresponding to half-filling and/or zero magnetization where on general grounds we anticipate that the transport is subballistic but superdiffusive. We provide analytical and numerical evidence for Kardar-Parisi-Zhang (KPZ) dynamical scaling (with length and time scales related via x∼t2/3) along both lines and at the SO(4)-symmetric point where they intersect. Our results suggest that both spin-coherence crossovers and KPZ scaling may be accessed in near-term experiments with optical lattice Hubbard emulators.

关键词： Quantum statistical mechanics Quantum transport Strongly correlated systems Hubbard model Hydrodynamics Integrable systems

Electron pairing in the pseudogap state revealed by shot noise in copper-oxide junctions

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arXiv 2020年

作者： Zhou, Panpan Chen, Liyang Liu, Yue Sochnikov, Ilya Bollinger, Anthony T. Han, Myung-Geun Zhu, Yimei He, Xi Bozović, Ivan Natelson, Douglas Department of Physics and Astronomy Rice University HoustonTX77005 United States Applied Physics Graduate Program Rice University HoustonTX77005 United States School of Physics Peking University 100871 Beijing China Department of Physics University of Connecticut StorrsCT06269 United States Brookhaven National Laboratory UptonNY11973 United States Department of Applied Physics Yale University New HavenCT06520 United States

In the quest to understand high-temperature superconductivity in copper oxides, a vigorous debate has been focused on the pseudogap — a partial gap that opens over portions of the Fermi surface in the ‘normal’ state above the bulk critical temperature (Tc).1 The pseudogap has been attributed to precursor superconductivity, to the existence of preformed pairs, or to competing orders such as charge-density waves.1-4 A direct determination of the charge of carriers as a function of temperature and bias could help resolve among these alternatives. Here, we report measurements of the shot noise of tunneling current in high-quality La2-xSrxCuO4/La2CuO4/La2-xSrxCuO4 (LSCO/LCO/LSCO) heterostructures fabricated using atomic-layer-by-layer molecular beam epitaxy, for several doping levels. The data delineate three distinct regions in the bias voltage-temperature (V-T) space. Well outside the superconducting gap region, the shot noise agrees quantitatively with independent tunneling of charge-e carriers. Deep within the gap, shot noise is greatly enhanced, reminiscent of multiple Andreev reflections.5-7 Starting above Tc and extending to biases much larger than the gap, there is a broad region in which the noise substantially exceeds the expectations of single-charge tunneling, indicating pairing of carriers. Pairs are detectable deep into the pseudogap region of temperature and bias. © 2020, CC BY.

关键词： Copper oxides

Differentiable Modeling of Planet and Substellar Atmosphere: High-Resolution Emission, Transmission, and Reflection Spectroscopy with ExoJAX2

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arXiv 2024年

作者： Kawahara, Hajime Kawashima, Yui Tada, Shotaro Ishikawa, Hiroyuki Tako Hosokawa, Ko Kasagi, Yui Kotani, Takayuki Masuda, Kento Nugroho, Stevanus K. Tamura, Motohide Yama, Hibiki Kitzmann, Daniel Minesi, Nicolas Morris, Brett M. Department of Space Astronomy and Astrophysics ISAS/JAXA 3-1-1 Yoshinodai Kanagawa Sagamihara252-5210 Japan Department of Astronomy Graduate School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Department of Astronomy Graduate School of Science Kyoto University Kitashirakawa Oiwake-cho Sakyo-ku Kyoto606-8502 Japan Frontier Research Institute for Interdisciplinary Sciences Department of Geophysics Tohoku University Aramaki aza Aoba 6-3 Aoba-ku Sendai980-8578 Japan Cluster for Pioneering Research RIKEN 2-1 Hirosawa Wako Saitama 351-0198 Japan Astronomical Science Program The Graduate University for Advanced Studies SOKENDAI 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Department of Physics and Astronomy The University of Western Ontario 1151 Richmond St LondonONN6A 3K7 Canada Institute of Space and Astronomical Science Japan Aerospace Exploration Agency 3-1-1 Yoshinodai Chuo-ku Kanagawa Sagamihara252-5210 Japan Astrobiology Center 2-21-1 Osawa Mitaka Tokyo181-8588 Japan National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Department of Earth and Space Science Osaka University Osaka560-0043 Japan Graduate School of Science The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Space Research and Planetary Sciences Physics Institute University of Bern Gesellschaftsstrasse 6 Bern3012 Switzerland Laboratoire EM2C CNRS CentraleSupélec Université Paris-Saclay 3 rue Joliot Curie Gif-sur-Yvette91190 France Space Telescope Science Institute 3700 San Martin Dr BaltimoreMD21218 United States

Modeling based on differentiable programming holds great promise for astronomy, enabling advanced techniques such as gradient-based posterior sampling and optimization. This paradigm motivated us to develop ExoJAX (Kawahara et al. 2022), the first auto-differentiable spectrum model of exoplanets and brown dwarfs. ExoJAX directly calculates cross-sections as functions of temperature and pressure to minimize interpolation errors in high-dispersion spectra, although initial work focused on narrowband emission spectroscopy. Here, we introduce a fast, memory-efficient opacity algorithm and differentiable radiative transfer for emission, transmission, and reflection spectroscopy. In the era of data-rich JWST observations, retrieval analyses are often forced to bin high-resolution spectra due to computational bottlenecks. The new algorithm efficiently handles native-resolution data, preserving the full information content and dynamic range. The advances proposed in this paper enable broader applications, demonstrated by retrievals of GL229 B’s high-dispersion emission, WASP-39 b’s JWST mid-resolution transmission at original resolution (R ∼ 2, 700), and Jupiter’s reflection spectrum. We derive a C/O ratio for GL229 B consistent with its host star, constrain WASP-39 b’s radial velocity from molecular line structures, and infer Jupiter’s metallicity in line with previous estimates. © 2024, CC BY.

关键词： Extraterrestrial atmospheres

Recent MAGIC results on Galactic binaries 37

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Recent MAGIC results on Galactic binaries

37th International Cosmic Ray Conference, ICRC 2021

作者： Molina, E. López-Oramas, A. Hadasch, D. Hoang, J. Acciari, V.A. Ansoldi, S. Antonelli, L.A. Arbet Engels, A. Artero, M. Asano, K. Baack, D. Babić, A. Baquero, A. Barres de Almeida, U. Barrio, J.A. Batković, I. Becerra González, J. Bednarek, W. Bellizzi, L. Bernardini, E. Bernardos, M. Berti, A. Besenrieder, J. Bhattacharyya, W. Bigongiari, C. Biland, A. Blanch, O. Bökenkamp, H. Bonnoli, G. Bošnjak, Ž. Busetto, G. Carosi, R. Ceribella, G. Cerruti, M. Chai, Y. Chilingarian, A. Cikota, S. Colak, S.M. Colombo, E. Contreras, J.L. Cortina, J. Covino, S. D'Amico, G. D'Elia, V. Da Vela, P. Dazzi, F. De Angelis, A. De Lotto, B. Delfino, M. Delgado, J. Delgado Mendez, C. Depaoli, D. Di Pierro, F. Di Venere, L. Do Souto Espiñeira, E. Dominis Prester, D. Donini, A. Dorner, D. Doro, M. Elsaesser, D. Fallah Ramazani, V. Fattorini, A. Fonseca, M.V. Font, L. Fruck, C. Fukami, S. Fukazawa, Y. García López, R.J. Garczarczyk, M. Gasparyan, S. Gaug, M. Giglietto, N. Giordano, F. Gliwny, P. Godinović, N. Green, J.G. Green, D. Hahn, A. Heckmann, L. Herrera, J. Hrupec, D. Hütten, M. Inada, T. Ishio, K. Iwamura, Y. Jiménez Martínez, I. Jormanainen, J. Jouvin, L. Karjalainen, M. Kerszberg, D. Kobayashi, Y. Kubo, H. Kushida, J. Lamastra, A. Lelas, D. Leone, F. Lindfors, E. Linhoff, L. Lombardi, S. Longo, F. López-Coto, R. López-Moya, M. Loporchio, S. Machado de Oliveira Fraga, B. Maggio, C. Majumdar, P. Makariev, M. Mallamaci, M. Maneva, G. Manganaro, M. Mannheim, K. Maraschi, L. Mariotti, M. Martínez, M. Mazin, D. Menchiari, S. Mender, S. Mićanović, S. Miceli, D. Miener, T. Miranda, J.M. Mirzoyan, R. Moralejo, A. Morcuende, D. Moreno, V. Moretti, E. Nakamori, T. Nava, L. Neustroev, V. Nigro, C. Nilsson, K. Nishijima, K. Noda, K. Nozaki, S. Ohtani, Y. Oka, T. Otero-Santos, J. Paiano, S. Palatiello, M. Paneque, D. Paoletti, R. Paredes, J.M. Pavletić, L. Peñil, P. Persic, M. Pihet, M. Prada Moroni, P.G. Prandini, E. Priyadarshi, C. Puljak, I. Rhode, W. Martí i Franquès 1 Barcelona08028 Spain Instituto de Astrofísica de Canarias Dpto. de Astrofísica Universidad de La Laguna Tenerife La LagunaE-38200 Spain Università di Udine INFN Trieste UdineI-33100 Italy RomeI-00136 Italy ETH Zürich ZürichCH-8093 Switzerland Bellaterra BarcelonaE-08193 Spain The University of Tokyo Chiba Kashiwa277-8582 Japan Technische Universität Dortmund DortmundD-44221 Germany Zagreb10000 Croatia IPARCOS Institute EMFTEL Department Universidad Complutense de Madrid MadridE-28040 Spain URCA RJ Rio de Janeiro22290-180 Brazil Università di Padova INFN PadovaI-35131 Italy University of Lodz Faculty of Physics and Applied Informatics Department of Astrophysics Lodz90-236 Poland Università di Siena INFN Pisa SienaI-53100 Italy ZeuthenD-15738 Germany Max-Planck-Institut für Physik MünchenD-80805 Germany Instituto de Astrofísica de Andalucía-CSIC Glorieta de la Astronomía s/n Granada18008 Spain Università di Pisa INFN Pisa PisaI-56126 Italy Universitat de Barcelona ICCUB IEEC-UB BarcelonaE-08028 Spain Armenian MAGIC Group A. Alikhanyan National Science Laboratory Yerevan0036 Armenia Centro de Investigaciones Energéticas Medioambientales y Tecnológicas MadridE-28040 Spain INFN MAGIC Group INFN Sezione di Torino Università degli Studi di Torino TorinoI-10125 Italy INFN MAGIC Group INFN Sezione di Bari Dipartimento Interateneo di Fisica Università e del Politecnico di Bari BariI-70125 Italy Croatian MAGIC Group University of Rijeka Department of Physics Rijeka51000 Croatia Universität Würzburg WürzburgD-97074 Germany Finnish MAGIC Group Finnish Centre for Astronomy ESO University of Turku TurkuFI-20014 Finland Departament de Física CERES-IEEC Universitat Autònoma de Barcelona BellaterraE-08193 Spain Japanese MAGIC Group: Physics Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima739-8526 Japan Armenian MAGIC Group ICRANet-Armenia NAS R

X-ray and gamma-ray binaries are systems consisting of a compact object and normally a non-degenerate companion star. Most of these sources have been shown to emit radiation in a broad frequency range, from radio up to X-rays and sometimes gamma rays. We report on recent results in very high-energy gamma rays above 100 GeV obtained by the MAGIC Collaboration for the Galactic X-ray binaries MAXI J1820+070 and 1A 0535+262, and the gamma-ray binary HESS J0632+057. Multiwavelength data at lower energies are also provided for a better contextualisation of the sources. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0)

关键词： Gamma rays

The HASHTAG project II. Giant molecular cloud properties across the M31 disc

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arXiv 2025年

作者： Deng, Yikai Li, Zongnan Li, Zhiyuan Liu, Lijie Ren, Zhiyuan Athikkat-Eknath, Gayathri de Grijs, Richard Eales, Stephen A. Eden, David J. Iono, Daisuke Jiao, Sihan Lee, Bumhyun Li, Di Saintonge, Amelie Smith, Matthew W.L. Tang, Xindi Tsai, Chaowei van der Giessen, Stefan A. Williams, Thomas G. Wu, Jingwen National Astronomical Observatories Chinese Academy of Sciences A20 Datun Road Chaoyang District Beijing100101 China University of Chinese Academy of Sciences Beijing100049 China School of Astronomy and Space Science Nanjing University Nanjing210023 China National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Key Laboratory of Modern Astronomy and Astrophysics Nanjing University Nanjing210023 China Technical University of Denmark Kgs LyngbyDK2800 Denmark DTU-Space Technical University of Denmark Elektrovej 327 Kgs. LyngbyDK2800 Denmark School of Physics & Astronomy Cardiff University The Parade CardiffCF24 3AA United Kingdom School of Mathematical and Physical Sciences Macquarie University Balaclava Road SydneyNSW2109 Australia Astrophysics and Space Technologies Research Centre Macquarie University Balaclava Road SydneyNSW2109 Australia International Space Science Institute–Beijing 1 Nanertiao Zhongguancun Hai Dian District Beijing100190 China Department of Physics University of Bath Claverton Down BathBA2 7AY United Kingdom Armagh Observatory and Planetarium College Hill ArmaghBT61 9DB United Kingdom Astronomical Science Program The Graduate University for Advanced Studies SOKENDAI 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Department of Astronomy Yonsei University 50 Yonsei-ro Seodaemun-gu Seoul03722 Korea Republic of Department of Astronomy Tsinghua Centre for Astrophysics Tsinghua University Beijing100084 China Department of Physics & Astronomy University College London Gower Place LondonWC1E 6BT United Kingdom Auf dem Hu¥gel 69 BonnD-53121 Germany Xinjiang Astronomical Observatory Chinese Academy of Sciences Urumqi830011 China Sterrenkundig Observatorium Ghent University Krijgslaan 281 - S9 Gent9000 Belgium Dept. Fisica Teorica y del Cosmos GranadaE-18071 Spain Sub-department of Astrophysics Department of Physics University of Oxford Keble Road OxfordOX1 3RH United Kingdom

We present a study of giant molecular cloud (GMC) properties in the Andromeda galaxy (M31) using CO(3-2) data from the James Clerk Maxwell Telescope (JCMT) in selected regions across the disc and in the nuclear ring, and comparing them with CO(1-0) observations from the IRAM 30m telescope in the same regions. We find that GMCs in the centre of M31 generally exhibit larger velocity dispersions (σ) and sizes (R) compared to those in the disc, while their average surface density (Σ) and turbulent pressure (Pturb) are lower. This low turbulent pressure in the central region is primarily due to the low density of molecular gas. The estimated GMC properties depend on the choice of CO transitions. Compared to CO(1-0), CO(3-2) exhibits smaller velocity dispersion and equivalent radius but higher surface density. These differences highlight the distinct physical conditions probed by different molecular gas tracers. We estimate the virial parameter αvir ∝ σ2R/Σ and find that most molecular clouds exhibit high values (αvir ∼ 4 − 6) for both CO transitions, indicating that they are unbound. Furthermore, clouds in the nuclear ring display even larger αvir values of 100, suggesting that they may be highly dynamic, short-lived structures, although they could potentially achieve equilibrium under the external pressure exerted by the surrounding interstellar medium. Copyright © 2025, The Authors. All rights reserved.

关键词： Atmospheric density

Hyperspectral spectro-imager survey for state of art concept identification

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Hyperspectral spectro-imager survey for state of art concept...

2020 International Conference on Space Optics, ICSO 2020

作者： Wanajaroen, Weerapot Lépine, Thierry Buisset, Christophe Castelnau, Matthieu Costes, Vincent Wannawichian, Suwicha Poshyachinda, Saran Soonthornthuma, Boonrucksar T. Donkaew A. Maerim 260 Moo 4 Chiangmai50180 Thailand Doctor of Philosophy Degree Program in Astronomy Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai50200 Thailand Institut d'Optique Graduate School 18 rue Benoît Lauras Saint-Etienne42000 France Laboratoire Hubert Curien Université de Lyon CNRS 18 rue Benoît Lauras Saint-EtienneF-42000 France CNES 18 Avenue Edouard Belin Toulouse Cedex 931401 France Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai50200 Thailand

Over the past twenty years, a very high number of different space hyperspectral spectrometers have been designed, developed and launched. Recently, several new compact designs based on freeform optics have been proposed in the literature. We thus considered that it was interesting to make a survey of the already existing hyperspectral imagers and innovative freeform designs to identify the most promising solutions to increase the compactness and the performance. Some surveys on hyperspectral imagers have already been done in the past. For example, the survey by Herring et al, in 1993 which proposed some hyperspectral spectrometer concepts. However, these studies are now outdated and cannot be used to identify state of art concepts. The review proposed by Kumar et al., in 2015 presented the advantages to browse the different hyperspectral imager concepts but provided only superficial technical details that cannot be used to identify the specific designs that improve both the compactness and the image and spectral qualities. We thus decided to make a bibliographic survey to analyze the most recent designs of different space hyperspectral imagers with the objective to select the concepts that will provide the best compromise between the volume and the performance. We have categorized the different systems into four groups: prism based, Offner, Three Mirror Anastigmat (TMA) and Dyson spectrometers. We analyzed these different concepts and we identified and the advantages and the drawbacks. We concluded that the most interesting state-of-art designs are the Freeform Offner, double-pass TMA and Dyson spectrometers. These designs present the most interesting performance and combine with a compact volume. We thus established a preliminary trade-off that summarizes the advantages and the drawback of these concepts. This trade-off analysis could be used as a starting point for any future study aiming at designing compact hyperspectral imager. Finally, we present the progress

关键词： Surveys

Analysis of the W 44 Supernova Remnant and its surroundings with Fermi-LAT and MAGIC 37

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Analysis of the W 44 Supernova Remnant and its surroundings ...

37th International Cosmic Ray Conference, ICRC 2021

作者： Di Tria, R. Di Venere, L. Giordano, F. Green, D. Hahn, A. Pantaleo, F.R. Strzys, M. Acciari, V.A. Ansoldi, S. Antonelli, L.A. Engels, A. Arbet Artero, M. Asano, K. Baack, D. Babić, A. Baquero, A. de Almeida, U. Barres Barrio, J.A. Batković, I. González, J. Becerra Bednarek, W. Bellizzi, L. Bernardini, E. Bernardos, M. Berti, A. Besenrieder, J. Bhattacharyya, W. Bigongiari, C. Biland, A. Blanch, O. Bökenkamp, H. Bonnoli, G. Bošnjak, Ž. Busetto, G. Carosi, R. Ceribella, G. Cerruti, M. Chai, Y. Chilingarian, A. Cikota, S. Colak, S.M. Colombo, E. Contreras, J.L. Cortina, J. Covino, S. D'Amico, G. D'Elia, V. Da Vela, P. Dazzi, F. De Angelis, A. De Lotto, B. Delfino, M. Delgado, J. Mendez, C. Delgado Depaoli, D. Di Pierro, F. Do Souto Espiñeira, E. Prester, D. Dominis Donini, A. Dorner, D. Doro, M. Elsaesser, D. Ramazani, V. Fallah Fattorini, A. Fonseca, M.V. Font, L. Fruck, C. Fukami, S. Fukazawa, Y. López, R.J. García Garczarczyk, M. Gasparyan, S. Gaug, M. Giglietto, N. Gliwny, P. Godinović, N. Green, J.G. Hadasch, D. Heckmann, L. Herrera, J. Hoang, J. Hrupec, D. Hütten, M. Inada, T. Ishio, K. Iwamura, Y. Martínez, I. Jiménez Jormanainen, J. Jouvin, L. Karjalainen, M. Kerszberg, D. Kobayashi, Y. Kubo, H. Kushida, J. Lamastra, A. Lelas, D. Leone, F. Lindfors, E. Linhoff, L. Lombardi, S. Longo, F. López-Coto, R. López-Moya, M. López-Oramas, A. Loporchio, S. de Oliveira Fraga, B. Machado Maggio, C. Majumdar, P. Makariev, M. Mallamaci, M. Maneva, G. Manganaro, M. Mannheim, K. Maraschi, L. Mariotti, M. Martínez, M. Mazin, D. Menchiari, S. Mender, S. Mićanović, S. Miceli, D. Miener, T. Miranda, J.M. Mirzoyan, R. Molina, E. Moralejo, A. Morcuende, D. Moreno, V. Moretti, E. Nakamori, T. Nava, L. Neustroev, V. Nigro, C. Nilsson, K. Nishijima, K. Noda, K. Nozaki, S. Ohtani, Y. Oka, T. Otero-Santos, J. Paiano, S. Palatiello, M. Paneque, D. Paoletti, R. Paredes, J.M. Pavletić, L. Peñil, P. Persic, M. Pihet, M. Moroni, P.G. Prada Prandini, E. Instituto de Astrofísica de Canarias Dpto. de Astrofísica Universidad de La Laguna Tenerife La LagunaE-38200 Spain Università di Udine INFN Trieste UdineI-33100 Italy RomeI-00136 Italy ETH Zürich ZürichCH-8093 Switzerland Bellaterra BarcelonaE-08193 Spain The University of Tokyo Chiba Kashiwa277-8582 Japan Technische Universität Dortmund DortmundD-44221 Germany Zagreb10000 Croatia IPARCOS Institute EMFTEL Department Universidad Complutense de Madrid MadridE-28040 Spain URCA RJ Rio de Janeiro22290-180 Brazil Università di Padova INFN PadovaI-35131 Italy University of Lodz Faculty of Physics and Applied Informatics Department of Astrophysics Lodz90-236 Poland Università di Siena INFN Pisa SienaI-53100 Italy ZeuthenD-15738 Germany Max-Planck-Institut für Physik Föhringer Ring 6 MünchenD-80805 Germany Instituto de Astrofísica de Andalucía-CSIC Glorieta de la Astronomía s/n Granada18008 Spain Università di Pisa INFN Pisa PisaI-56126 Italy Universitat de Barcelona ICCUB IEEC-UB BarcelonaE-08028 Spain Armenian MAGIC Group A. Alikhanyan National Science Laboratory Yerevan0036 Armenia Centro de Investigaciones Energéticas Medioambientales y Tecnológicas MadridE-28040 Spain INFN MAGIC Group INFN Sezione di Torino Università degli Studi di Torino TorinoI-10125 Italy INFN MAGIC Group INFN Sezione di Bari Dipartimento Interateneo di Fisica Università e del Politecnico di Bari via Orabona 4 BariI-70125 Italy Croatian MAGIC Group University of Rijeka Department of Physics Rijeka51000 Croatia Universität Würzburg WürzburgD-97074 Germany Finnish MAGIC Group Finnish Centre for Astronomy With ESO University of Turku TurkuFI-20014 Finland Departament de Física CERES-IEEC Universitat Autònoma de Barcelona BellaterraE-08193 Spain Japanese MAGIC Group Physics Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima739-8526 Japan Armenian MAGIC Group ICRANet-Armenia NAS RA Yerev

The well-known supernova remnant (SNR) W 44 is observed in high-energy gamma rays and widely studied to investigate cosmic ray (CR) acceleration. Several analyses of the W 44 surroundings showed the presence of gamma-ray emission offset from the radio SNR shell. This emission is thought to originate from escaped high-energy CRs. We present a detailed analysis of the W 44 region as seen by Fermi-LAT, focusing on the spatial and spectral characteristics of both W 44 SNR and its surroundings. The spatial analysis was limited to energies above 1 GeV in order to exploit the improved angular resolution of the instrument, deriving a detailed description of the region morphology. Observations of the north-western region of W 44, also known as SRC-1 from previous works, were conducted with the MAGIC telescopes in the very high-energy gamma-ray band. We analysed MAGIC data exploiting the spatial information derived with the Fermi-LAT analysis at GeV energies. Here we show the results of both analyses and the combined Fermi-LAT and MAGIC spectra, thus obtaining constraining information on the diffusion of the escaped CRs. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).

关键词： Germanium alloys

Cluster-coalesced defects induced by gamma irradiation on pulsed laser deposited VO 2 thin films

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Materials Today: Proceedings 2022年 53卷 429-431页

作者： I.G. Madiba B.S. Khanyile B. Mabakachaba M.C. Mbambo A.K.H. Bashir F. Ezema M. Maaza UNESCO-UNISA Africa Chair in Nanoscience / Nanotechnology College of Graduate Studies University of South Africa (UNISA) Muckleneuk Ridge P O Box 392 Pretoria South Africa iThemba LABS-National Research Foundation 1 Old Faure Road Somerset West 7129 PO Box 722 Somerset West Western Cape Province South Africa Cape Peninsula university of Technology Faculty of Applied Sciences Maths and Physics Department P. O Box 1906 Belville 7535 South Africa University of the Western Cape Robert Sobukwe Road Bellville 7535 Republic of South Africa Department of Physics and Astronomy University of Nigeria Nsukka Nigeria

This contribution reports on the radiation tolerance of Vanadium dioxide thin films subjected to different projectile doses of gamma irradiation (3 kGy-100 kGy). Thin films of vanadium dioxide were deposited by pulsed laser deposition method on silicon substrate. Radiation modifications were investigated by studies on the morphology and electrical properties of vanadium dioxide. Gamma irradiation thermally altered the structural morphology of VO 2 thin films, inducing defects like ball clusters characterized by the localized heating effect. At higher doses, cluster defects coalesce to large ball structures, consequently decreasing the overall current density of VO 2 thin films.

关键词： Vanadium dioxide Pulsed laser deposition Metal to insulator transition Cluster defects Gamma irradiation