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SSRN 2020年

作者： Xue, Zhenggang Yan, Muyu Yu, Xing Tong, Yujing Zhou, Huang Zhao, Yafei Wang, Zhiyuan Zhang, Yunshang Xiong, Can Hong, Xun Luo, Jun Lin, Yue Huang, Weixing Li, Yafei Wu, Yuen School of Chemistry and Materials Science National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei230026 China Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials School of Chemistry and Materials Science Nanjing Normal University Nanjing210023 China CAS Key Laboratory of Materials for Energy Conversion Department of Chemical Physics University of Science and Technology of China Hefei230026 China Center for Electron Microscopy Tianjin Key Lab of Advanced Functional Porous Materials Institute for New Energy Materials & Low-Carbon Technologies School of Materials Tianjin University of Technology Tianjin300384 China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Hefei230026 China

Here we develop a freestanding ladder-like ZnO surface with abundant unsaturated step defects, which could efficiently anchor Au1 sites with one dimensional assembling for the ultrasensitive NO2 detection. The dimension of obtained ZnO hexagonal ladder could be precisely controlled through reasonably regularizing the nucleation and growth rate. Following a layer-by-layer growth mode, the obtained ZnO would adopt the step-rich evolution. These ladder-like structure could provide abundant unsaturated step defects along with their curved edge profiles to serve as susceptible centers to site-selectively immobilize isolated Au1 species (Au1-ZnO). The obtained Au1-ZnO catalysts exhibit an outstanding NO2 sensing response (12.6 to 300 ppb) at a low operating temperature (150 °C). The proposed step-induced strategy will broaden the rational design of special sites-trapped supported metal catalysis for gas sensors. © 2020, The Authors. All rights reserved.

关键词： Ladders

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Construction of Frustrated Lewis Pairs in Poly(heptazine Imide) Nanosheets via Hydrogen Bonds for Boosting CO2Photoreduction

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Angewandte Chemie 2024年第36期136卷

作者： Dr. Min Zhou Dr. Haozhi Wang Rong Liu Zheyang Liu Xinyan Xiao Weilin Li Prof. Chao Gao Prof. Zhou Lu Prof. Zhifeng Jiang Prof. Weidong Shi Prof. Yujie Xiong Institute for Energy Research School of Chemistry and Chemical Engineering Jiangsu University 212013 Zhenjiang Jiangsu P. R. China These authors equally contributed to this work School of Materials Science and Engineering Key Laboratory of Pico Electron Microscopy of Hainan Province Hainan University 570228 Haikou Hainan P. R. China Anhui Engineering Research Center of Carbon Neutrality The Key Laboratory of Functional Molecular Solids Ministry of Education Anhui Laboratory of Molecular-Based Materials College of Chemistry and Materials Science School of Physics and Electronic Information Anhui Normal University 241002 Wuhu Anhui P. R. China School of Chemistry and Materials Science Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China 230026 Hefei Anhui P. R. China

The creation of frustrated Lewis pairs on catalyst surface is an effective strategy for tuning CO 2 activation. The critical step in the formation of frustrated Lewis pairs is the spatial effect of proximal Lewis acid-Lewis base pairs. Here, we demonstrate a facile surface functionalization methodology that enables hydrogen bonding between N and H atoms to mediate the construction of frustrated Lewis pairs in poly(heptazine imide), thereby increasing the propensity to activate CO 2 molecules. Experimental and theoretical results show that the construction of active hydrogen bonding regions can facilitate the bending of CO 2 molecules. Furthermore, the delocalization of electron clouds induced by the hydrogen bonding-mediated frustrated Lewis pairs can promote the heterolytic cleavage and photocatalytic conversion of CO 2 . This work highlights the potential of utilizing hydrogen bonding-mediated strategy in heterogeneously photocatalytic activation of CO 2 over polymer materials.

关键词： Photocatalysis CO2 reduction frustrated Lewis pairs hydrogen bond polymer

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Measurements of q2 moments of inclusive B→Xcℓ+νℓ decays with hadronic tagging

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physical Review D 2021年第11期104卷 112011-112011页

作者： R. van Tonder L. Cao W. Sutcliffe M. Welsch F. U. Bernlochner I. Adachi H. Aihara D. M. Asner T. Aushev R. Ayad V. Babu P. Behera K. Belous J. Bennett M. Bessner V. Bhardwaj B. Bhuyan T. Bilka J. Biswal A. Bobrov D. Bodrov J. Borah A. Bozek M. Bračko P. Branchini A. Budano M. Campajola D. Červenkov M.-C. Chang P. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin H. E. Cho K. Cho S.-J. Cho Y. Choi S. Choudhury D. Cinabro S. Cunliffe S. Das G. De Nardo G. De Pietro R. Dhamija F. Di Capua J. Dingfelder Z. Doležal T. V. Dong S. Dubey D. Epifanov T. Ferber B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Giri P. Goldenzweig E. Graziani T. Gu Y. Guan K. Gudkova C. Hadjivasiliou S. Halder O. Hartbrich K. Hayasaka H. Hayashii W.-S. Hou C.-L. Hsu T. Iijima K. Inami A. Ishikawa R. Itoh M. Iwasaki W. W. Jacobs S. Jia Y. Jin K. K. Joo A. B. Kaliyar K. H. Kang G. Karyan H. Kichimi C. Kiesling C. H. Kim D. Y. Kim K.-H. Kim Y.-K. Kim K. Kinoshita P. Kodyš T. Konno S. Korpar E. Kovalenko P. Križan R. Kroeger P. Krokovny T. Kuhr M. Kumar R. Kumar K. Kumara A. Kuzmin Y.-J. Kwon J. S. Lange M. Laurenza S. C. Lee P. Lewis C. H. Li J. Li L. K. Li Y. B. Li L. Li Gioi J. Libby K. Lieret D. Liventsev C. MacQueen M. Masuda T. Matsuda D. Matvienko M. Merola F. Metzner K. Miyabayashi R. Mizuk G. B. Mohanty S. Mohanty M. Mrvar M. Nakao Z. Natkaniec A. Natochii L. Nayak N. K. Nisar S. Nishida K. Nishimura K. Ogawa S. Ogawa H. Ono P. Oskin P. Pakhlov G. Pakhlova T. Pang S. Pardi H. Park S.-H. Park A. Passeri S. Patra S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik V. Popov E. Prencipe M. T. Prim A. Rabusov M. Röhrken A. Rostomyan N. Rout G. Russo D. Sahoo L. Santelj V. Savinov G. Schnell C. Schwanda Y. Seino K. Senyo M. E. Sevior M. Shapkin C. Sharma C. P. Shen J.-G. Shiu A. Sokolov E. Solovieva M. Starič Z. S. Stottler J. F. Strube M. Sumihama T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida F. Tenchini K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo S. E. Vahsen G. Varner K. E. Varvell E. Waheed C. H. Wang E. Wang M.-Z. Wang University of Bonn 53115 Bonn High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Department of Physics University of Tokyo Tokyo 113-0033 Brookhaven National Laboratory Upton New York 11973 National Research University Higher School of Economics Moscow 101000 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Deutsches Elektronen–Synchrotron 22607 Hamburg Indian Institute of Technology Madras Chennai 600036 Institute for High Energy Physics Protvino 142281 University of Mississippi University Mississippi 38677 University of Hawaii Honolulu Hawaii 96822 Indian Institute of Science Education and Research Mohali SAS Nagar 140306 Indian Institute of Technology Guwahati Assam 781039 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 Faculty of Chemistry and Chemical Engineering University of Maribor 2000 Maribor INFN–Sezione di Roma Tre I-00146 Roma INFN–Sezione di Napoli I-80126 Napoli Università di Napoli Federico II I-80126 Napoli Department of Physics Fu Jen Catholic University Taipei 24205 Department of Physics National Taiwan University Taipei 10617 Max-Planck-Institut für Physik 80805 München National Central University Chung-li 32054 Department of Physics and Institute of Natural Sciences Hanyang University Seoul 04763 Korea Institute of Science and Technology Information Daejeon 34141 Yonsei University Seoul 03722 Sungkyunkwan University Suwon 16419 Indian Institute of Technology Hyderabad Telangana 502285 Wayne State University Detroit Michigan 48202 Malaviya National Institute of Technology Jaipur Jaipur 302017 Key Laboratory of Nuclear Physics and Io

We present the measurement of the first to fourth order moments of the four-momentum transfer squared, q2, of inclusive B→Xcℓ+νℓ decays using the full Belle dataset of 711 fb−1 of integrated luminosity at the ϒ(4S) resonance where ℓ=e, μ. The determination of these moments and their systematic uncertainties open new pathways to determine the absolute value of the Cabibbo-Kobayashi-Maskawa matrix element Vcb using a reduced set of matrix elements of the heavy quark expansion. In order to identify and reconstruct the Xc system, we reconstruct one of the two B-mesons using machine learning techniques in fully hadronic decay modes. The moments are measured with progressively increasing threshold selections on q2 starting with a lower value of 3.0 GeV2 in steps of 0.5 GeV2 up to a value of 10.0 GeV2. The measured moments are further unfolded, correcting for reconstruction and selection effects as well as QED final state radiation. We report the moments separately for electron and muon final states and observe no lepton flavor universality violating effects.

关键词： Leptonic, semileptonic & radiative decays Bottom quark Particle data analysis Precision measurements

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Realizing the temporal resolution of electron dynamics in UEM

Realizing the temporal resolution of electron dynamics in UE...

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Ultrafast Optics 2017

作者： Hassan, M. Th. Baskin, J.S. Liao, B. Zewail, A.H. Physical Biology Center for Ultrafast Science and Technology Arthur Amos Noyes Laboratory of Chemical Physics California Institute of Technology PasadenaCA91125 United States Department of Physics University of Arizona TucsonAZ85721 United States

We demonstrate more than an order of magnitude enhancement in the UEM temporal resolution by generating isolated ∼ 30 fs electron pulses via optical-gating, with sufficient intensity for efficiently probing the elect...

ISBN: (纸本)9781510617162

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Unidirectional Sidechain Engineering to Construct Dual-Asymmetric Acceptors for 19.23 % Efficiency Organic Solar Cells with Low Energy Loss and Efficient Charge Transfer

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Angewandte Chemie 2023年第36期135卷

作者： Qunping Fan Ruijie Ma Jie Yang Jingshun Gao Hairui Bai Wenyan Su Zezhou Liang Yue Wu Lingxiao Tang Yuxiang Li Qiang Wu Kun Wang Lihe Yan Rui Zhang Feng Gao Gang Li Wei Ma State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China Department of Electrical and Electronic Engineering Research Institute for Smart Energy (RISE) Guangdong-Hong Kong-Macao (GHM) Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong 999077 China School of Chemistry and Chemical Engineering Beijing Institute of Technology Beijing 100081 China School of Materials and Chemical Engineering Zhongyuan University of Technology Zhengzhou 451191 China School of Materials Science and Engineering Xi'an University of Science and Technology Xi'an 710054 China Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Photonic Technique for Information School of Electronics Science & Engineering Faculty of Electronic and Information Engineering Xi'an Jiaotong University Xi'an 710049 China Laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductor-Optoelectronics Materials and Devices College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 China Department of Physics Chemistry and Biology (IFM) Linköping University 58183 Linköping Sweden

Achieving both high open-circuit voltage ( V oc ) and short-circuit current density ( J sc ) to boost power-conversion efficiency (PCE) is a major challenge for organic solar cells (OSCs), wherein high energy loss ( E loss ) and inefficient charge transfer usually take place. Here, three new Y-series acceptors of mono-asymmetric asy-YC11 and dual-asymmetric bi-asy-YC9 and bi-asy-YC12 are developed. They share the same asymmetric D 1 AD 2 (D 1 =thieno[3,2- b ]thiophene and D 2 =selenopheno[3,2- b ]thiophene) fused-core but have different unidirectional sidechain on D 1 side, allowing fine-tuned molecular properties, such as intermolecular interaction, packing pattern, and crystallinity. Among the binary blends, the PM6 : bi-asy-YC12 one has better morphology with appropriate phase separation and higher order packing than the PM6 : asy-YC9 and PM6 : bi-asy-YC11 ones. Therefore, the PM6 : bi-asy-YC12-based OSCs offer a higher PCE of 17.16 % with both high V oc and J sc , due to the reduced E loss and efficient charge transfer properties. Inspired by the high V oc and strong NIR-absorption, bi-asy-YC12 is introduced into efficient binary PM6 : L8-BO to construct ternary OSCs. Thanks to the broadened absorption, optimized morphology, and furtherly minimized E loss , the PM6 : L8-BO : bi-asy-YC12-based OSCs achieve a champion PCE of 19.23 %, which is one of the highest efficiencies among these annealing-free devices. Our developed unidirectional sidechain engineering for constructing bi-asymmetric Y-series acceptors provides an approach to boost PCE of OSCs.

关键词： Charge Transfer Dual-Asymmetric Acceptors Energy Loss Organic Solar Cells Sidechain Engineering

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science with the Daksha High Energy Transients Mission

arXiv

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arXiv 2022年

作者： Bhalerao, Varun Sawant, Disha Pai, Archana Tendulkar, Shriharsh Vadawale, Santosh Bhattacharya, Dipankar Rana, Vikram Adalja, Hitesh Kumar L. Anupama, G.C. Bala, Suman Banerjee, Smaranika Basu, Judhajeet Belatikar, Hrishikesh Beniamini, Paz Bhaganagare, Mahesh Bhaskar, Ankush Bhattacharjee, Soumyadeep Bose, Sukanta Cenko, Brad Chanda, Mehul Vijay Dewangan, Gulab Dixit, Vishal Dutta, Anirban Gawade, Priyanka Ghodgaonkar, Abhijeet Goyal, Shiv Kumar Gunasekaran, Suresh Hemanth, Manikantan Hotokezaka, Kenta Iyyani, Shabnam Guruprasad, P.J. Kasliwal, Mansi Koyande, Jayprakash G. Kulkarni, Salil Kutty, A.P.K. Ladiya, Tinkal Mahapatra, Suddhasatta Marla, Deepak Mate, Sujay Mehla, Advait Mithun, N.P.S. More, Surhud Mote, Rakesh Mukherjee, Dipanjan Narang, Sanjoli Narendranath, Shyama Nema, Ayush Nimbalkar, Sudhanshu Nissanke, Samaya Palit, Sourav Patel, Jinaykumar Patel, Arpit Paul, Biswajit Pradeep, Priya Ramachandran, Prabhu Roy, Kinjal Saiguhan, B.S. Bharath Saji, Joseph Saleem, M. Saraogi, Divita Sastry, Parth Shanmugam, M. Sharma, Piyush Shetye, Amit Singh, Nishant Singh, Shreeya Singhal, Akshat Sreekumar, S. Sridhar, Srividhya Srinivasan, Rahul Tallur, Siddharth Tiwari, Neeraj K. Vadladi, Amrutha Lakshmi Vaishnava, C.S. Vishwakarma, Sandeep Waratkar, Gaurav Department of Physics IIT Bombay Powai Mumbai400076 India Department of Astronomy and Astrophysics Tata Institute of Fundamental Research Mumbai400005 India Physical Research Laboratory Navrangpura Ahmedabad380009 India Ashoka University Department of Physics Haryana Sonepat131029 India Raman Research Institute C. V. Raman Avenue Sadashivanagar Bengaluru560080 India Indian Institute of Astrophysics 2nd Block 100 Feet Rd Koramangala Bengaluru560034 India Tohoku University Aoba Sendai980-0845 Japan Stockholm University AlbaNova StockholmSE 10691 Sweden Department of Electrical Engineering IIT Bombay Powai Mumbai400076 India Department of Natural Sciences The Open University of Israel P.O Box 808 Ra'anana4353701 Israel Department of Physics Indian Institute of Science Karnataka Bengaluru560012 India Inter-University Center for Astronomy and Astrophysics Maharashtra Pune411007 India University of Maryland College Park United States Interdisciplinary Program in Climate Studies IIT Bombay Powai Mumbai400076 India Department of Aerospace Engineering IIT Bombay Powai Mumbai400076 India University of Tokyo Bunkyo City Tokyo113-8654 Japan School of Physics IISER Kerala Thiruvananthapuram695551 India Division of Physics Mathematics and Astronomy California Institute of Technology PasadenaCA91125 United States Department of Mechanical Engineering IIT Bombay Powai Mumbai400076 India Space Astronomy Group U R Rao Satellite Centre ISRO Bengaluru560037 India Nikhef Science Park 105 Amsterdam1098 XG Netherlands Department of Mechanical and Aerospace Engineering The University of Texas at Arlington ArlingtonTX76019 United States Vikram Sarabhai Space Centre Kochuveli Thiruvananthapuram695022 India Chennai Mathematical Institute Tamilnadu Siruseri603103 India School of Physics and Astronomy University of Minnesota MinneapolisMN55455 United States Department of Chemical Engineering IIT Bombay Powai Mumbai400076 Ind

We present the science case for the proposed Daksha high energy transients mission. Daksha will comprise of two satellites covering the entire sky from 1 keV to > 1 MeV. The primary objectives of the mission are to discover and characterize electromagnetic counterparts to gravitational wave source;and to study Gamma Ray Bursts (GRBs). Daksha is a versatile all-sky monitor that can address a wide variety of science cases. With its broadband spectral response, high sensitivity, and continuous all-sky coverage, it will discover fainter and rarer sources than any other existing or proposed mission. Daksha can make key strides in GRB research with polarization studies, prompt soft spectroscopy, and fine time-resolved spectral studies. Daksha will provide continuous monitoring of X-ray pulsars. It will detect magnetar outbursts and high energy counterparts to Fast Radio Bursts. Using Earth occultation to measure source fluxes, the two satellites together will obtain daily flux measurements of bright hard X-ray sources including active galactic nuclei, X-ray binaries, and slow transients like Novae. Correlation studies between the two satellites can be used to probe primordial black holes through lensing. Daksha will have a set of detectors continuously pointing towards the Sun, providing excellent hard X-ray monitoring data. Closer to home, the high sensitivity and time resolution of Daksha can be leveraged for the characterization of Terrestrial Gamma-ray Flashes. © 2022, CC BY.

关键词： Gravity waves

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A study of Galactic Plane Planck Galactic Cold Clumps observed by SCOPE and the JCMT Plane Survey

arXiv

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arXiv 2024年

作者： Eden, D.J. Liu, Tie Moore, T.J.T. Di Francesco, J. Fuller, G. Kim, Kee-Tae Li, Di Liu, S.-Y. Plume, R. Tatematsu, Ken'ichi Thompson, M.A. Wu, Y. Bronfman, L. Butner, H.M. Currie, M.J. Garay, G. Goldsmith, P.F. Hirano, N. Johnstone, D. Juvela, M. Lai, S.-P. Lee, C.W. Mannfors, E.E. Olguin, F. Pattle, K. Park, Geumsook Polychroni, D. Rawlings, M. Rigby, A.J. Sanhueza, P. Traficante, A. Urquhart, J.S. Weferling, B. White, G.J. Yadav, R.K. Armagh Observatory and Planetarium College Hill ArmaghBT61 9DB United Kingdom Shanghai Astronomical Observatory Chinese Academy of Sciences 80 Nandan Road Shanghai200030 China Astrophysics Research Institute Liverpool John Moores University Liverpool Science Park iC2 146 Brownlow Hill. LiverpoolL3 5RF United Kingdom NRC Herzberg Astronomy and Astrophysics 5071 West Saanich Rd VictoriaBCV9E 2E7 Canada Department of Physics and Astronomy University of Victoria VictoriaBCV8W 2Y2 Canada Jodrell Bank Centre for Astrophysics School of Physics and Astronomy The University of Manchester Oxford Road ManchesterM13 9PL United Kingdom Korea Astronomy and Space Science Institute 776 Daedeokdae-ro Yuseong-gu Daejon34055 Korea Republic of 217 Gajeong-ro Yuseong-gu Daejeon34113 Korea Republic of National Astronomical Observatories Chinese Academy of Sciences Beijing100012 China Key Laboratory of Radio Astronomy Chinese Academy of Science Nanjing210008 China Academia Sinica Institute of Astronomy and Astrophysics 11F of AS/NTU Astronomy-Mathematics Building No.1 Sec. 4 Roosevelt Rd Taipei10617 Taiwan Department of Physics and Astronomy University of Calgary 2500 University Drive NW CalgaryABT2N 1N4 Canada Nobeyama Radio Observatory National Astronomical Observatory of Japan National Institutes of Natural Sciences Nobeyama Minamimaki Minamisaku Nagano384-1305 Japan Astronomical Science Program Graduate Institute for Advanced Studies SOKENDAI 2-21-1 Osawa Mitaka Tokyo181-8588 Japan School of Physics and Astronomy University of Leeds LeedsLS2 9JT United Kingdom Department of Astronomy Peking University Beijing100871 China Astronomy Department Universidad de Chile Casilla 36-D Santiago Chile Department of Physics and Astronomy James Madison University MSC 4502 901 Carrier Drive HarrisonburgVA22807 United States RAL Space STFC Rutherford Appleton Laboratory Chilton Didcot OxfordshireOX11 0QX United Kingdom East Asian Observatory

We have investigated the physical properties of Planck Galactic Cold Clumps (PGCCs) located in the Galactic Plane, using the JCMT Plane Survey (JPS) and the SCUBA-2 Continuum Observations of Pre-protostellar Evolution (SCOPE) survey. By utilising a suite of molecular-line surveys, velocities and distances were assigned to the compact sources within the PGCCs, placing them in a Galactic context. The properties of these compact sources show no large-scale variations with Galactic environment. Investigating the star-forming content of the sample, we find that the luminosity-to-mass ratio (L/M) is an order of magnitude lower than in other Galactic studies, indicating that these objects are hosting lower levels of star formation. Finally, by comparing ATLASGAL sources that are associated or are not associated with PGCCs, we find that those associated with PGCCs are typically colder, denser, and have a lower L/M ratio, hinting that PGCCs are a distinct population of Galactic Plane sources. Copyright © 2024, The Authors. All rights reserved.

关键词： Stars

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Search for B0→τ±ℓ∓ (ℓ=e, μ) with a hadronic tagging method at Belle

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physical Review D 2021年第9期104卷 L091105-L091105页

作者： H. Atmacan A. J. Schwartz K. Kinoshita I. Adachi K. Adamczyk H. Aihara S. Al Said D. M. Asner V. Aulchenko T. Aushev R. Ayad V. Babu S. Bahinipati M. Bauer P. Behera K. Belous J. Bennett F. Bernlochner M. Bessner V. Bhardwaj B. Bhuyan T. Bilka J. Biswal A. Bobrov A. Bozek M. Bračko P. Branchini T. E. Browder A. Budano M. Campajola L. Cao D. Červenkov M.-C. Chang P. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin H. E. Cho K. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe S. Das N. Dash G. De Nardo G. De Pietro R. Dhamija F. Di Capua J. Dingfelder Z. Doležal T. V. Dong S. Dubey D. Epifanov T. Ferber D. Ferlewicz A. Frey B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig E. Graziani D. Greenwald T. Gu Y. Guan K. Gudkova C. Hadjivasiliou S. Halder T. Hara O. Hartbrich K. Hayasaka H. Hayashii W.-S. Hou C.-L. Hsu K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs S. Jia Y. Jin K. K. Joo A. B. Kaliyar K. H. Kang Y. Kato T. Kawasaki C. Kiesling C. H. Kim D. Y. Kim K.-H. Kim S. H. Kim Y.-K. Kim P. Kodyš T. Konno A. Korobov S. Korpar E. Kovalenko P. Križan R. Kroeger P. Krokovny T. Kuhr R. Kulasiri K. Kumara Y.-J. Kwon Y.-T. Lai J. S. Lange M. Laurenza S. C. Lee J. Li L. K. Li Y. B. Li L. Li Gioi J. Libby K. Lieret D. Liventsev C. MacQueen M. Masuda T. Matsuda D. Matvienko M. Merola F. Metzner K. Miyabayashi R. Mizuk G. B. Mohanty R. Mussa M. Nakao Z. Natkaniec A. Natochii L. Nayak M. Nayak M. Niiyama N. K. Nisar S. Nishida S. Ogawa H. Ono Y. Onuki P. Oskin P. Pakhlov G. Pakhlova S. Pardi H. Park S.-H. Park A. Passeri S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik E. Prencipe M. T. Prim I. Ripp-Baudot A. Rostomyan N. Rout G. Russo D. Sahoo S. Sandilya A. Sangal L. Santelj T. Sanuki V. Savinov G. Schnell J. Schueler C. Schwanda Y. Seino K. Senyo M. E. Sevior M. Shapkin C. Sharma C. P. Shen J.-G. Shiu F. Simon A. Sokolov E. Solovieva M. Starič Z. S. Stottler M. Sumihama K. Sumisawa T. Sumiyoshi W. Sutcliffe U. Tamponi K. Tanida Y. Tao F. Tenchini University of Cincinnati Cincinnati Ohio 45221 High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 Department of Physics University of Tokyo Tokyo 113-0033 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Department of Physics Faculty of Science King Abdulaziz University Jeddah 21589 Brookhaven National Laboratory Upton New York 11973 Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 National Research University Higher School of Economics Moscow 101000 Deutsches Electronen-Synchrotron 22607 Hamburg Indian Institute of Technology Bhubaneswar Satya Nagar 751007 Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe Indian Institute of Technology Madras Chennai 600036 Institute for High Energy Physics Protvino 142281 University of Mississippi University Mississippi 38677 University of Bonn 53115 Bonn University of Hawaii Honolulu Hawaii 96822 Indian Institute of Science Education and Research Mohali SAS Nagar 140306 Indian Institute of Technology Guwahati Assam 781039 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana Faculty of Chemistry and Chemical Engineering University of Maribor 2000 Maribor INFN—Sezione di Roma Tre I-00146 Rome INFN—Sezione di Napoli I-80126 Napoli Università di Napoli Federico II I-80126 Napoli Department of Physics Fu Jen Catholic University Taipei 24205 Department of Physics National Taiwan University Taipei 10617 Max-Planck-Institut für Physik 80805 München National Central University Chung-li 32054 Department of Physics and Institute of Natural Sciences Hanyang University Seoul 04763 P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Korea Institute of Science and Technology Information Da

We present a search for the lepton-flavor-violating decays B0→τ±ℓ∓, where ℓ=(e,μ), using the full data sample of 772×106 BB¯ pairs recorded by the Belle detector at the KEKB asymmetric-energy e+e− collider. We use events in which one B meson is fully reconstructed in a hadronic decay mode. The τ± lepton is reconstructed indirectly using the momentum of the reconstructed B and that of the ℓ∓ from the signal decay. We find no evidence for B0→τ±ℓ∓ decays and set upper limits on their branching fractions at 90% confidence level of B(B0→τ±μ∓)<1.5×10−5 and B(B0→τ±e∓)<1.6×10−5.

关键词： Branching fraction Hypothetical particle physics models Leptonic, semileptonic & radiative decays Rare decays Bottom mesons Tau leptons Flavor symmetries Lepton colliders

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The Astrometric Animation of Water Masers towards the Mira Variable BX Cam

arXiv

引用

arXiv 2022年

作者： Xu, Shuangjing Imai, Hiroshi Yun, Youngjoo Zhang, Bo Rioja, María J. Dodson, Richard Cho, Se-Hyung Kim, Jaeheon Cui, Lang Sobolev, Andrey M. Chibueze, James O. Kim, Dong-Jin Amada, Kei Nakashima, Jun-Ichi Orosz, Gabor Oyadomari, Miyako Oh, Sejin Yonekura, Yoshinori Sun, Yan Mai, Xiaofeng Zhang, Jingdong Wen, Shiming Jung, Taehyun Korea Astronomy and Space Science Institute 776 Daedeok-daero Yuseong-gu Daejeon34055 Korea Republic of Shanghai Astronomical Observatory Chinese Academy of Sciences 80 Nandan Road Shanghai200030 China Graduate School of Science and Engineering Kagoshima University 1-21-35 Korimoto Kagoshima890-0065 Japan Amanogawa Galaxy Astronomy Research Center Graduate School of Science and Engineering Kagoshima University 1-21-35 Korimoto Kagoshima890-0065 Japan Center for General Education Institute for Comprehensive Education Kagoshima University 1-21-30 Korimoto Kagoshima890-0065 Japan ICRAR M468 The University of Western Australia 35 Stirling Hwy CrawleyWA6009 Australia CSIRO Astronomy and Space Science PO Box 1130 BentleyWA6102 Australia Alfonso XII 3 y 5 Madrid28014 Spain Astronomy program Department of Physics and Astronomy Seoul National University Seoul08826 Korea Republic of Republic of Korea Korea Astronomy and Space Science Institute Yuseonggu Daejeon34055 Korea Republic of Xinjiang Astronomical Observatory Chinese Academy of Sciences 150 Science 1-Street Urumqi830011 China Ural Federal University 19 Mira Street Ekaterinburg620002 Russia Centre for Space Research North-West University Potchefstroom2520 South Africa Department of Physics and Astronomy Faculty of Physical Sciences University of Nigeria Carver Building 1 University Road Nsukka Nigeria Massachusetts Institute of Technology Haystack Observatory 99 Millstone Road WestfordMA01886 United States Max-Planck-Institut für Radioastronomie Auf dem Hügel 69 BonnD-53121 Germany School of Physics and Astronomy Sun Yat-sen University 2 Daxue Road Tangjia Guangdong Province Zhuhai China Joint Institute for VLBI ERIC Oude Hoogeveensedijk 4 Dwingeloo7991PD Netherlands Center for Astronomy Ibaraki University 2-1-1 Bunkyo Ibaraki Mito310-8512 Japan Yuquan Rd. Shijingshan Beijing100049 China

We report VLBI monitoring observations of the 22 GHz water (H2O) masers around the Mira variable BX Cam, which were carried out as a part of the EAVN Synthesis of Stellar Maser Animations (ESTEMA) project. Data of 37 epochs in total were obtained from 2018 May to 2021 June with a time interval of 3–4 weeks, spanning approximately three stellar pulsation periods (P =∼440 d). In particular, the dual-beam system equipped on the VERA stations was used to measure the kinematics and parallaxes of the H2O maser features. The measured parallax, π = 1.79 ± 0.08 mas, is consistent with Gaia EDR3 and previously measured VLBI parallaxes within a 1-σ error level. The position of the central star was estimated, based on both the Gaia EDR3 data and the center position of the ring-like 43 GHz silicon-monoxide (SiO) maser distribution imaged with the KVN. The three-dimensional H2O maser kinematics indicates that the circumstellar envelope is expanding at a velocity of 13 ± 4 km s−1, while there are asymmetries in both the spatial and velocity distributions of the maser features. Furthermore, the H2O maser animation achieved by our dense monitoring program manifests the propagation of shock waves in the circumstellar envelope of BX Cam. © 2022, CC BY.

关键词： Stars

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Tailoring thermal conductivity of bulk graphene oxide by tuning the oxidation degree

引用

Chinese chemical Letters 2018年第5期29卷 711-715页

作者： Qing-Long Meng Hengchang Liu Zhiwei Huang Shuang Kong Peng Jiang Xinhe Bao State Key Laboratory of Catalysis CAS Center for Excellence in Nanoscience Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China School of Physical Science and Technology Shanghai Tech University Shanghai 200031 China University of Chinese Academy of Sciences Beijing 100039 China

Bulk graphene oxide （GO） shows great potential in a variety of applications, such as sensors,photodetectors, supercapacitors, lithium ion batteries and catalysts. However, its thermal conductivity,one of the most important and fundamental physical properties, is still less known. Herein, we havesystematically investigated the thermal conductivity of bulk GOs and find that it can be tailored by tuningtheir oxidation degree during preparation process. Notably, the cross-plane thermal conductivity of bulkGO, in comparison with its precursor graphite, exhibits more than 100 times decrease at roomtemperature. The dependence of thermal conductivity of GO on oxidation degree is attributed to thechemical and structural changes by introducing oxygen atoms and oxygen-containing functional groups,which can lead to a significant enhancement in atomic- and nano-scale phonon scattering. Furthermore,we reveal that the thermal conductivity of bulk GOs exhibits evident anisotropic behavior. These resultsprovide fundamental understanding and valuable information on thermal transport properties of bulkGOs for various practical applications.

关键词： Graphene oxide Thermal conductivity Scattering center Anisotropy Oxidation degree

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