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PANDORA Project for the study of photonuclear reactions below

The European Physical Journal A 2023年第9期59卷 1-21页

作者： Tamii, A. Pellegri, L. Söderström, P.-A. Allard, D. Goriely, S. Inakura, T. Khan, E. Kido, E. Kimura, M. Litvinova, E. Nagataki, S. Neumann-Cosel, P. von Pietralla, N. Shimizu, N. Tsoneva, N. Utsuno, Y. Adachi, S. Adsley, P. Bahini, A. Balabanski, D. Baret, B. Bekker, J. A. C. Binda, S. D. Boicu, E. Bracco, A. Brandherm, I. Brezeanu, M. Brummer, J. W. Camera, F. Crespi, F. C. L. Dalal, R. Donaldson, L. M. Fujikawa, Y. Furuno, T. Haoning, H. Higuchi, R. Honda, Y. Gavrilescu, A. Inoue, A. Isaak, J. Jivan, H. Jones, P. Jongile, S. Just, O. Kawabata, T. Khumalo, T. Kiener, J. Kleemann, J. Kobayashi, N. Koshio, Y. Kuşoğlu, A. Li, K. C. W. Malatji, K. L. Molaeng, R. E. Motoki, H. Murata, M. Netshiya, A. A. Neveling, R. Niina, R. Okamoto, S. Ota, S. Papst, O. Parizot, E. Petruse, T. Reen, M. S. Ring, P. Sakanashi, K. Sideras-Haddad, E. Siem, S. Spall, M. Suda, T. Sudo, T. Taniguchi, Y. Tatischeff, V. Utsunomiya, H. Wang, H. Werner, V. Wibowo, H. Wiedeking, M. Wieland, O. Xu, Y. Yang, Z. H. Research Center for Nuclear Physics (RCNP) Osaka University Ibaraki Japan Institute for Radiation Sciences (IRS) Osaka University Toyonaka Japan Department of Physics Osaka University Toyonaka Japan School of Physics University of the Witwatersrand Johannesburg South Africa Themba Laboratory for Accelerator Based Sciences Somerset West South Africa Extreme Light Infrastructure-Nuclear Physics (ELI-NP)/Horia Hulubei National Institute for Physics and Nuclear Engineering (IFIN-HH) Bucharest-Măgurele Romania Laboratoire Astroparticule et Cosmologie CNRS Université Paris Cité Paris France Institut d’Astronomie et d’Astrophysique Université Libre de Bruxelles Brussels Belgium Tokyo Institute of Technology Tokyo Japan IJCLab CNRS/IN2P3 Université Paris-Saclay Orsay Cedex France RIKEN Wako Japan Department of Physics Hokkaido University Sapporo Japan Faculty of Science Japan and Nuclear Reaction Data Centre Hokkaido University Sapporo Japan Department of Physics Western Michigan University Kalamazoo USA Institut für Kernphysik Technische Universität Darmstadt Darmstadt Germany Center for Computational Sciences University of Tsukuba Tsukuba Japan Advanced Science Research Center Japan Atomic Energy Agency Tokai Japan Cyclotron and Radioisotope Center Tohoku University Sendai Japan Department of Physics and Astronomy Texas A &M University College Station USA Cyclotron Institute Texas A &M University College Station USA University of Bucharest Bucharest-Măgurele Romania Dipartimento di Fisica dell’Università degli Studi di Milano Milan Italy INFN Sezione di Milano Milan Italy Guru Jambheshwar University of Science and Technology Hisar India Department of Physics Kyoto University Kyoto Japan Politehnica University of Bucharest Bucharest Romania GSI Helmholtzzentrum für Schwerionenforschung Darmstadt Germany Department of Physics Okayama University Okayama Japan Department of Physics Faculty of Science Istanbul University Istanbul Turkey Depart

Photonuclear reactions of light nuclei below a mass of $$A=60$$ are planned to be studied experimentally and theoretically with the PANDORA (Photo-Absorption of Nuclei and Decay Observation for Reactions in Astrophysics) project. Two experimental methods, virtual photon excitation by proton scattering and real photo absorption by a high-brilliance $$\gamma $$ -ray beam produced by laser Compton scattering, will be applied to measure the photoabsorption cross sections and decay branching ratio of each decay channel as a function of the photon energy. Several nuclear models, e.g. anti-symmetrized molecular dynamics, mean-field and beyond-mean-field models, a large-scale shell model, and ab initio models, will be employed to predict the photonuclear reactions. The uncertainty in the model predictions will be evaluated based on the discrepancies between the model predictions and experimental data. The data and predictions will be implemented in the general reaction calculation code, TALYS. The results will be applied to the simulation of the photo-disintegration process of ultra-high-energy cosmic rays in inter-galactic propagation.

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Charge-Sign Dependent Cosmic-Ray Modulation Observed with the Calorimetric Electron Telescope on the International Space Station

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Physical Review Letters 2023年第21期130卷 211001-211001页

作者： O. Adriani Y. Akaike K. Asano Y. Asaoka E. Berti G. Bigongiari W. R. Binns M. Bongi P. Brogi A. Bruno J. H. Buckley N. Cannady G. Castellini C. Checchia M. L. Cherry G. Collazuol G. A. de Nolfo K. Ebisawa A. W. Ficklin H. Fuke S. Gonzi T. G. Guzik T. Hams K. Hibino M. Ichimura K. Ioka W. Ishizaki M. H. Israel K. Kasahara J. Kataoka R. Kataoka Y. Katayose C. Kato N. Kawanaka Y. Kawakubo K. Kobayashi K. Kohri H. S. Krawczynski J. F. Krizmanic P. Maestro P. S. Marrocchesi A. M. Messineo J. W. Mitchell S. Miyake A. A. Moiseev M. Mori N. Mori H. M. Motz K. Munakata S. Nakahira J. Nishimura S. Okuno J. F. Ormes S. Ozawa L. Pacini P. Papini B. F. Rauch S. B. Ricciarini K. Sakai T. Sakamoto M. Sasaki Y. Shimizu A. Shiomi P. Spillantini F. Stolzi S. Sugita A. Sulaj M. Takita T. Tamura T. Terasawa S. Torii Y. Tsunesada Y. Uchihori E. Vannuccini J. P. Wefel K. Yamaoka S. Yanagita A. Yoshida K. Yoshida W. V. Zober Department of Physics University of Florence Via Sansone 1 - 50019 Sesto Fiorentino Italy INFN Sezione di Firenze Via Sansone 1 - 50019 Sesto Fiorentino Italy Waseda Research Institute for Science and Engineering Waseda University 17 Kikuicho Shinjuku Tokyo 162-0044 Japan JEM Utilization Center Human Spaceflight Technology Directorate Japan Aerospace Exploration Agency 2-1-1 Sengen Tsukuba Ibaraki 305-8505 Japan Institute for Cosmic Ray Research The University of Tokyo 5-1-5 Kashiwa-no-Ha Kashiwa Chiba 277-8582 Japan Institute of Applied Physics (IFAC) National Research Council (CNR) Via Madonna del Piano 10 50019 Sesto Fiorentino Italy Department of Physical Sciences Earth and Environment University of Siena via Roma 56 53100 Siena Italy INFN Sezione di Pisa Polo Fibonacci Largo B. Pontecorvo 3 - 56127 Pisa Italy Department of Physics and McDonnell Center for the Space Sciences Washington University One Brookings Drive Saint Louis Missouri 63130-4899 USA Heliospheric Physics Laboratory NASA/GSFC Greenbelt Maryland 20771 USA Center for Space Sciences and Technology University of Maryland Baltimore County 1000 Hilltop Circle Baltimore Maryland 21250 USA Astroparticle Physics Laboratory NASA/GSFC Greenbelt Maryland 20771 USA Center for Research and Exploration in Space Sciences and Technology NASA/GSFC Greenbelt Maryland 20771 USA Department of Physics and Astronomy Louisiana State University 202 Nicholson Hall Baton Rouge Louisiana 70803 USA Department of Physics and Astronomy University of Padova Via Marzolo 8 35131 Padova Italy INFN Sezione di Padova Via Marzolo 8 35131 Padova Italy Institute of Space and Astronautical Science Japan Aerospace Exploration Agency 3-1-1 Yoshinodai Chuo Sagamihara Kanagawa 252-5210 Japan Kanagawa University 3-27-1 Rokkakubashi Kanagawa Yokohama Kanagawa 221-8686 Japan Faculty of Science and Technology Graduate School of Science and Technology Hirosaki University 3 Bunkyo Hirosaki Aomori 036

We present the observation of a charge-sign dependent solar modulation of galactic cosmic rays (GCRs) with the Calorimetric Electron Telescope onboard the International Space Station over 6 yr, corresponding to the positive polarity of the solar magnetic field. The observed variation of proton count rate is consistent with the neutron monitor count rate, validating our methods for determining the proton count rate. It is observed by the Calorimetric Electron Telescope that both GCR electron and proton count rates at the same average rigidity vary in anticorrelation with the tilt angle of the heliospheric current sheet, while the amplitude of the variation is significantly larger in the electron count rate than in the proton count rate. We show that this observed charge-sign dependence is reproduced by a numerical “drift model” of the GCR transport in the heliosphere. This is a clear signature of the drift effect on the long-term solar modulation observed with a single detector.

关键词： Cosmic ray composition & spectra Cosmic ray propagation Cosmic ray sources Cosmic rays & astroparticles

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Direct Measurement of the Cosmic-Ray Helium Spectrum from 40 GeV to 250 TeV with the Calorimetric Electron Telescope on the International Space Station

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Physical Review Letters 2023年第17期130卷 171002-171002页

作者： O. Adriani Y. Akaike K. Asano Y. Asaoka E. Berti G. Bigongiari W. R. Binns M. Bongi P. Brogi A. Bruno J. H. Buckley N. Cannady G. Castellini C. Checchia M. L. Cherry G. Collazuol G. A. de Nolfo K. Ebisawa A. W. Ficklin H. Fuke S. Gonzi T. G. Guzik T. Hams K. Hibino M. Ichimura K. Ioka W. Ishizaki M. H. Israel K. Kasahara J. Kataoka R. Kataoka Y. Katayose C. Kato N. Kawanaka Y. Kawakubo K. Kobayashi K. Kohri H. S. Krawczynski J. F. Krizmanic P. Maestro P. S. Marrocchesi A. M. Messineo J. W. Mitchell S. Miyake A. A. Moiseev M. Mori N. Mori H. M. Motz K. Munakata S. Nakahira J. Nishimura S. Okuno J. F. Ormes S. Ozawa L. Pacini P. Papini B. F. Rauch S. B. Ricciarini K. Sakai T. Sakamoto M. Sasaki Y. Shimizu A. Shiomi P. Spillantini F. Stolzi S. Sugita A. Sulaj M. Takita T. Tamura T. Terasawa S. Torii Y. Tsunesada Y. Uchihori E. Vannuccini J. P. Wefel K. Yamaoka S. Yanagita A. Yoshida K. Yoshida W. V. Zober Department of Physics University of Florence Via Sansone 1–50019 Sesto Fiorentino Italy INFN Sezione di Firenze Via Sansone 1–50019 Sesto Fiorentino Italy Waseda Research Institute for Science and Engineering Waseda University 17 Kikuicho Shinjuku Tokyo 162-0044 Japan JEM Utilization Center Human Spaceflight Technology Directorate Japan Aerospace Exploration Agency 2-1-1 Sengen Tsukuba Ibaraki 305-8505 Japan Institute for Cosmic Ray Research The University of Tokyo 5-1-5 Kashiwa-no-Ha Kashiwa Chiba 277-8582 Japan Institute of Applied Physics (IFAC) National Research Council (CNR) Via Madonna del Piano 10 50019 Sesto Fiorentino Italy Department of Physical Sciences Earth and Environment University of Siena via Roma 56 53100 Siena Italy INFN Sezione di Pisa Polo Fibonacci Largo B. Pontecorvo 3–56127 Pisa Italy Department of Physics and McDonnell Center for the Space Sciences Washington University One Brookings Drive St. Louis Missouri 63130-4899 USA Heliospheric Physics Laboratory NASA/GSFC Greenbelt Maryland 20771 USA Center for Space Sciences and Technology University of Maryland Baltimore County 1000 Hilltop Circle Baltimore Maryland 21250 USA Astroparticle Physics Laboratory NASA/GSFC Greenbelt Maryland 20771 USA Center for Research and Exploration in Space Sciences and Technology NASA/GSFC Greenbelt Maryland 20771 USA Department of Physics and Astronomy Louisiana State University 202 Nicholson Hall Baton Rouge Louisiana 70803 USA Department of Physics and Astronomy University of Padova Via Marzolo 8 35131 Padova Italy INFN Sezione di Padova Via Marzolo 8 35131 Padova Italy Institute of Space and Astronautical Science Japan Aerospace Exploration Agency 3-1-1 Yoshinodai Chuo Sagamihara Kanagawa 252-5210 Japan Kanagawa University 3-27-1 Rokkakubashi Kanagawa Yokohama Kanagawa 221-8686 Japan Faculty of Science and Technology Graduate School of Science and Technology Hirosaki University 3 Bunkyo Hirosaki Aomori 036-8561 J

We present the results of a direct measurement of the cosmic-ray helium spectrum with the CALET instrument in operation on the International Space Station since 2015. The observation period covered by this analysis spans from October 13, 2015, to April 30, 2022 (2392 days). The very wide dynamic range of CALET allowed for the collection of helium data over a large energy interval, from ∼40 GeV to ∼250 TeV, for the first time with a single instrument in low Earth orbit. The measured spectrum shows evidence of a deviation of the flux from a single power law by more than 8σ with a progressive spectral hardening from a few hundred GeV to a few tens of TeV. This result is consistent with the data reported by space instruments including PAMELA, AMS-02, and DAMPE and balloon instruments including CREAM. At higher energy we report the onset of a softening of the helium spectrum around 30 TeV (total kinetic energy). Though affected by large uncertainties in the highest energy bins, the observation of a flux reduction turns out to be consistent with the most recent results of DAMPE. A double broken power law is found to fit simultaneously both spectral features: the hardening (at lower energy) and the softening (at higher energy). A measurement of the proton to helium flux ratio in the energy range from 60 GeV/n to about 60 TeV/n is also presented, using the CALET proton flux recently updated with higher statistics.

关键词： Cosmic ray & astroparticle detectors Cosmic ray acceleration Cosmic ray composition & spectra Cosmic ray propagation Cosmic ray sources Cosmic rays & astroparticles

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Solidification of α"-Fe 16N 2 Nanoparticles by High-Pressure Treatment at Several GPA

SSRN

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SSRN 2022年

作者： Oka, Kengo Ogawa, Tomoyuki Yamamoto, Hajime Sakaguchi, Chika Gallage, Ruwan Kobayashi, Naoya Azuma, Masaki Department of Electronic Engineering Graduate School of Engineering Tohoku University 6-6-05 Aza-Aoba Aramaki Aoba-ku Sendai980-8579 Japan Department of Applied Chemistry Faculty of Science and Engineering Kindai University 3-4-1 Kowakae Higashiosaka Osaka577-8502 Japan Institute of Multidisciplinary Research for Advanced Materials Tohoku University Katahira 2-1-1 Aoba-ku Sendai980-8577 Japan Laboratory for Materials and Structures Tokyo Institute of Technology 4259 Nagatsuta Midori-ku Kanagawa Yokohama226-8503 Japan Department of Mechanical and Manufacturing Engineering Graduate School of Engineering University of Ruhuna Hapugala Galle Sri Lanka Research & Development Division Future Materialz Co. Ltd. 15 Shimogamo-Morimoto-cho Sakyo-ku Kyoto606-0805 Japan Kanagawa Institute of Industrial Science and Technology 705-1 Shimoimaizumi Kanagawa Ebina243-0435 Japan

Demands for a high-performance magnet that is rare earth-free and composed of abundant elements is increasing. α"- Fe16N2 is a promising candidate for the alternative materials for Nd magnets, however, only the powdered sample had been obtained and the bulk α"- Fe16N2 magnet was absent. Here, we applied high-pressure (HP) and high-temperature (HT) treatment for solidification of α"- Fe16N2 powders. Our study revealed that HP treatment in the range of 1 to 3 GPa with moderate temperature gives a dense α"- Fe16N2 pellets. We also found that the pelletized sample maintained its magnetic properties for 100 days due to suppression of gradual decomposition in the air. © 2022, The Authors. All rights reserved.

关键词： Iron compounds

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Ellipticity-dependent sequential over-barrier ionization of cold rubidium

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Physical Review A 2020年第4期102卷 043112-043112页

作者： Junyang Yuan Shiwei Liu Xincheng Wang Zhenjie Shen Yixuan Ma Huanyu Ma Qiuxiang Meng Tian-Min Yan Yizhu Zhang Alexander Dorn Matthias Weidemüller Difa Ye Yuhai Jiang Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201210 China University of Chinese Academy of Sciences Beijing 100049 China School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics Beijing 100088 China Beijing Computational Science Research Center Beijing 100084 China Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering Key Laboratory of Optoelectronics Information and Technical Science Ministry of Education Tianjin University Tianjin 300072 China Max-Planck-Institut für Kernphysik Saupfercheckweg 1 DE-69117 Heidelberg Germany Hefei National Laboratory for Physical Sciences at the Microscale and Shanghai Branch University of Science and Technology of China 201315 Shanghai China CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China 201315 Shanghai China Physikalisches Institut Universität Heidelberg Im Neuenheimer Feld 226 69120 Heidelberg Germany

We perform high-resolution measurements of momentum distribution on Rbn+ recoil ions up to charge state n=4, where laser-cooled rubidium atoms are ionized by femtosecond elliptically polarized lasers with the pulse duration of 35 fs and the intensity of 3.3×1015W/cm2 in the over-barrier ionization (OBI) regime. The momentum distributions of the recoil ions are found to exhibit multiband structures as the ellipticity varies from the linear to circular polarizations. The origin of these band structures can be explained quantitatively by the simple man model based on the OBI mechanism and dedicated classical trajectory Monte Carlo simulations with Heisenberg potential. Specifically, with back analysis of the classical trajectories, we reveal the ionization time and the OBI geometry of the sequentially released electrons, disentangling the mechanisms behind the tilted angle of the band structures. These results indicate that the classical treatment can describe the strong-field multiple ionization processes of alkali atoms.

关键词： Multiphoton or tunneling ionization & excitation

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Structural and decay properties of nuclei appearing in the α-decay chains of 296,298,300,302,304120 within the relativistic mean field formalism

arXiv

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arXiv 2021年

作者： Biswal, N. Jain, Nishu Kumar, Raj Pradeep, A.S. Bhuyan, M. Department of Physics North Odisha University Sri Ram Chandra Vihar 757003 India School of Physics and Materials Science Thapar Institute of Engineering and Technology Patiala147004 India Department of Physics Rajiv Gandhi University of Knowledge Technologies Andhra Pradesh 516330 India Center for Theoretical and Computational Physics Department of Physics Faculty of Science University of Malaya Kuala Lumpur50603 Malaysia Atomic Molecular and Optical Research Group Advanced Institute of Materials Science Ton Duc Thang University Ho Chi Minh City Viet Nam Faculty of Applied Sciences Ton Duc Thang University Ho Chi Minh City Viet Nam

An extensive study of α-decay half-lives for various decay chains of isotopes of Z = 120 is performed within the axially deformed relativistic mean-field (RMF) formalism by employing the NL3, NL3∗, and DD-ME2 parameter set. The structural properties of the nuclei appearing in the decay chains are explored. The binding energy, quadrupole deformation parameter, root-mean-square charge radius, and pairing energy are calculated for the even-even isotopes of Z = 100 − 120, which are produced in five different α-decay chains, namely, 296120 → 260No, 298120 → 262No, 300120 → 264No, 302120 → 266No, and 304120 → 268No. A superdeformed prolate ground state is observed for the heavier nuclei, and gradually the deformation decreases towards the lighter nuclei in the considered decay chains. The RMF results are compared with various theoretical predictions and experimental data. The α-decay energies are calculated for each decay chain. To determine the relative numerical dependency of the half-life for a specific αdecay energy, the decay half-lives are calculated using four different formulas, namely, Viola-Seaborg, Alex-Brown, Parkhomenko-Sobiczewski, and Royer for the above said five α-decay chain. We notice a firm dependency of the half-life on the α-decay formula in terms of Qα-values for all decay chains. Further, the present study also strengthens the prediction for the island of stability in terms of magic number at the superheavy valley in the laboratories. Copyright © 2021, The Authors. All rights reserved.

关键词： Binding energy

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Mechanical properties of polypropylene (PP)/wood flour composites: Effect of pulverization with and without water of wood flour 18

Mechanical properties of polypropylene (PP)/wood flour compo...

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18th European Conference on Composite Materials, ECCM 2018

作者： Haque, Md Minhaz-Ul Goda, Koichi Ito, Hirokazu Ogoe, Shinji Okamoto, Masaki Ema, Tomoyuki Kagawa, Keiko Nogami, Hidetaka Department of Mechanical Engineering Yamaguchi University 2-16-1 Tokiwadai Ube Yamaguchi755-8611 Japan Department of Applied Chemistry and Chemical Engineering Islamic University Kushtia7003 Bangladesh Cellulose Materials Group National Institute of Advanced Industrial Science and Technology 3-11-32 Kagamiyama Higashihiroshima Hiroshima739-0046 Japan Technology Development Center TOCLAS Co. 1370 Nishiyama-cho Nishiku Hamamatsu Shizuoka432-8001 Japan Okayama Prefectural Research Institute for Forest and Forest Products 1884-2 Katsuyama Maniwa Okayama717-0013 Japan

ISBN: (纸本)9781510896932

This study analyses the effect of pulverization of wood flour with and without water to the tensile properties and impact behaviour of polypropylene (PP)/wood flour (WF) composites. The composites were processed in an extruder and subsequent injection moulding. The effects of initial wood flour particle size, type of trees (namely cypress and red pine trees) as well as plate gap (200 µm and 350 µm) in pulverization were also evaluated in terms of tensile properties and Izod impact strength of the prepared composites. Tensile strength values of composites were slightly affected by the pulverization of wood flour and the enhancement of tensile strength values were depended on the type of initial WF. From Izod impact test results of composites, it was found that the composites reinforced with pulverized WF with water displayed higher values of impact strength compared with the composites of pulverized WF without water. Composites with smaller particles displayed higher values of impact strength compared with the composites with larger particles. The composite of PP reinforced by smaller (165 µm) sized WF (obtained from cypress tree), which was pulverized with water displayed the highest value of impact strength (20 KJ/m2). © CCM 2020 - 18th European Conference on Composite Materials. All rights reserved.

关键词： Polypropylenes

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Understanding viscoelastic flow instabilities: Oldroyd-B and beyond

arXiv

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arXiv 2022年

作者： Sánchez, Hugo A. Castillo Jovanović, Mihailo R. Kumar, Satish Morozov, Alexander Shankar, V. Subramanian, Ganesh Wilson, Helen J. Department Of Applied Mathematics And Statistics Institute Of Mathematics And Computational Sciences University Of Sao Paulo Brazil Ming Hsieh Department Of Electrical And Computer Engineering University Of Southern California Los AngelesCA90089 United States Department Of Chemical Engineering And Materials Science University Of Minnesota MinneapolisMN55455 United States SUPA School Of Physics And Astronomy The University Of Edinburgh EdinburghEH9 3FD United Kingdom Department Of Chemical Engineering Indian Institute Of Technology Kanpur208016 India Engineering Mechanics Unit Jawaharlal Nehru Center For Advanced Scientific Research Bangalore560064 India Mathematics Department University College London Gower Street LondonWC1E 6BT United Kingdom

The Oldroyd-B model has been used extensively to predict a host of instabilities in shearing flows of viscoelastic fluids, often realized experimentally using polymer solutions. The present review, written on the occasion of the birth centenary of James Oldroyd, provides an overview of instabilities found across major classes of shearing flows. These comprise (i) the canonical rectilinear shearing flows including plane Couette, plane and pipe Poiseuille flows;(ii) viscometric shearing flows with curved streamlines such as those in the TaylorCouette, cone-and-plate and parallel-plate geometries;(iii) non-viscometric shearing flows with an underlying extensional flow topology such as the flow in a cross-slot device;and (iv) multilayer shearing flows. While the underlying focus in all these cases is on results obtained using the Oldroyd-B model, we also discuss their relation to the actual instability, and as to how the shortcomings of the Oldroyd-B model may be overcome by the use of more realistic constitutive models. All the three commonly used tools of stability analysis, viz., modal linear stability, nonmodal stability, and weakly nonlinear stability analyses are discussed, with supporting evidence from experiments and numerical simulations as appropriate. Despite only accounting for a shear-rate-independent viscosity and first normal stress coefficient, the Oldroyd-B model is able to qualitatively predict the majority of instabilities in the aforementioned shearing flows. The review also highlights, where appropriate, open questions in the area of viscoelastic stability. © 2022, CC BY.

关键词： Stability

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Spin-Triplet Excitonic Insulator: The Case of Semihydrogenated Graphene

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Physical Review Letters 2020年第16期124卷 166401-166401页

作者： Zeyu Jiang Wenkai Lou Yu Liu Yuanchang Li Haifeng Song Kai Chang Wenhui Duan Shengbai Zhang State Key Laboratory of Low-Dimensional Quantum Physics and Collaborative Innovation Center of Quantum Matter Department of Physics Tsinghua University Beijing 100084 China SKLSM Institute of Semiconductors Chinese Academy of Sciences P.O. Box 912 Beijing 100083 China Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics Beijing 100088 China Key Lab of advanced optoelectronic quantum architecture and measurement (MOE) and Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Beijing 100081 China CAEP Software Center for High Performance Numerical Simulation Beijing 100088 China Beijing Academy of Quantum Information Sciences Beijing 100193 China Institute for Advanced Study Tsinghua University Beijing 100084 China Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute Troy New York 12180 USA

While various excitonic insulators have been studied in the literature, due to the perceived too-small spin splitting, spin-triplet excitonic insulator is rare. In two-dimensional systems such as a semihydrogenated graphene (known as graphone), however, it is possible, as revealed by first-principles calculations coupled with Bethe-Salpeter equation. The critical temperature, given by an effective Hamiltonian, is 11.5 K. While detecting excitonic insulators is still a daunting challenge, the condensation of triplet excitons will result in spin superfluidity, which can be directly measured by a transport experiment. Nonlocal dielectric screening also leads to an unexpected phenomenon, namely, an indirect-to-direct transition crossover between single-particle band and exciton dispersion in the semihydrogenated graphene, which offers yet another test by experiment.

关键词： Excitons Graphene First-principles calculations

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Packaging, containerization, and virtualization of computational omics methods: Advances, challenges, and opportunities

arXiv

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arXiv 2022年

作者： Alser, Mohammed Waymost, Sharon Ayyala, Ram Lawlor, Brendan Abdill, Richard J. Rajkumar, Neha LaPierre, Nathan Brito, Jaqueline Ribeiro-Dos-Santos, André M. Firtina, Can Almadhoun, Nour Sarwal, Varuni Eskin, Eleazar Hu, Qiyang Strong, Derek Kim, Byoung-Do Abedalthagafi, Malak S. Mutlu, Onur Mangul, Serghei Department of Information Technology and Electrical Engineering ETH Zürich Zürich8092 Switzerland Department of Computer Science UCLA Los AngelesCA90095 United States Department of Translational Biomedical Informatics University of Southern California Los AngelesCA90089 United States Department of Clinical Pharmacy University of Southern California Los AngelesCA90089 United States Department of Computer Science Munster Technological University CorkT12 P928 Ireland Department of Genetics Cell Biology and Development University of Minnesota MinneapolisMN55417 United States Department of Bioengineering UCLA Los AngelesCA90095 United States Institute for Systems Genetics NYU Grossman School of Medicine New YorkNY10016 United States Department of Computational Medicine University of California Los AngelesCA90095 United States Department of Human Genetics University of California Los AngelesCA90095 United States Office of Advanced Research Computing UCLA Los AngelesCA90095 United States Center for Advanced Research Computing University of Southern California Los AngelesCA90089 United States Genomics Research Department Saudi Human Genome Project King Fahad Medical City King Abdulaziz City for Science and Technology Riyadh Saudi Arabia King Salman Center for Disability Research Riyadh12512 Saudi Arabia Riyadh Saudi Arabia

Omics software tools have reshaped the landscape of modern biology and become an essential component of biomedical research. The increasing dependence of biomedical scientists on these powerful tools creates a need for easier installation and greater usability. Packaging, virtualization, and containerization are different approaches to satisfy this need by wrapping omics tools in additional software that makes the omics tools easier to install and use. Here, we systematically review practices across prominent packaging, virtualization, and containerization platforms. We outline the challenges, advantages, and limitations of each approach and some of the most widely used platforms from the perspectives of users, software developers, and system administrators. We also propose principles to make packaging, virtualization, and containerization of omics software more sustainable and robust to increase the reproducibility of biomedical and life science research. © 2022, CC BY.

关键词： Containers

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