检索结果-内蒙古大学图书馆

arXiv 2024年

作者： Barnes, Edwin Bennett, Michael B. Boltasseva, Alexandra Borish, Victoria Brown, Bennett Carr, Lincoln D. Ceballos, Russell R. Dukes, Faith Easton, Emily W. Economou, Sophia E. Edwards, E.E. Finkelstein, Noah D. Fracchiolla, C. Franklin, Diana Freericks, J.K. Goss, Valerie Hannum, Mark Holincheck, Nancy Kelly, Angela M. Lanes, Olivia Lewandowski, H.J. Matsler, Karen Jo Mercurio, Emily Montaño, Inès Murdock, Maajida Peltz, Kiera Perron, Justin K. Richardson, Christopher J.K. Rosenberg, Jessica L. Ross, Richard S. Ryu, Minjung Samuel, Raymond E. Schrode, Nicole Schwamberger, Susan Searles, Thomas A. Singh, Chandralekha Tingle, Alexandra Zwickl, Benjamin M. Department of Physics Virginia Tech Center for Quantum Information Science and Engineering Virginia Tech 850 West Campus Drive BlacksburgVA24061 United States Q-SEnSE NSF QLCI University of Colorado 440 UCB BoulderCO80301 United States Elmore Family School of Electrical and Computer Engineering Birck Nanotechnology Center Purdue Quantum Science and Engineering Institute Purdue University 610 Purdue Mall West LafayetteIN47907 United States Quantum Science Center A National Quantum Information Science Research Center of The U.S. Department of Energy Oak Ridge National Laboratory 1 Bethel Valley Road Oak RidgeTN37830 United States JILA National Institute of Standards and Technology the University of Colorado BoulderCO80309 United States Department of Physics University of Colorado 390 UCB BoulderCO80309 United States QuSTEAM 510 Ronalds St. Iowa CityIA52245 United States Quantum Engineering Program Department of Physics Colorado School of Mines 1523 Illinois St. GoldenCO80401 United States QuSTEAM Non-Profit Wilbur Wright College City Colleges of Chicago 4300 N Narragansett Ave ChicagoIL60634 United States Government and Community Relations Office - K-12 Programs Lawrence Berkeley National Laboratory 1 Cyclotron Road BerkeleyCA United States Chicago Quantum Exchange 5235 S. Harper Court ChicagoIL60615 United States Department of Physics Virginia Tech 850 West Campus Drive BlacksburgVA24060 United States Department of Electrical and Computer Engineering Duke Quantum Center Duke University Duke University 130 Hudson Hall DurhamNC27708 United States American Physical Society 555 12th St. NW WashingtonDC20004 United States Computer Science University of Chicago 5730 S. Ellis Ave. ChicagoIL60637 United States Department of Physics Georgetown University 552 Reiss Science Building WashingtonDC20057 United States Chemistry Physics and Engineering Studies Chicago State University 9501 S. King Drive WSC 309 ChicagoIL606

In response to numerous programs seeking to advance quantum education and workforce development in the United States, experts from academia, industry, government, and professional societies convened for a National science Foundation-sponsored workshop in February 2024 to explore the benefits and challenges of establishing a national center for quantum education. Broadly, such a center would foster collaboration and build the infrastructure required to develop a diverse and quantum-ready workforce. The workshop discussions centered around how a center could uniquely address gaps in public, K-12, and undergraduate quantum information science and engineering (QISE) education. Specifically, the community identified activities that, through a center, could lead to an increase in student awareness of quantum careers, boost the number of educators trained in quantum-related subjects, strengthen pathways into quantum careers, enhance the understanding of the U.S. quantum workforce, and elevate public engagement with QISE. Core proposed activities for the center include professional development for educators, coordinated curriculum development and curation, expanded access to educational laboratory equipment, robust evaluation and assessment practices, network building, and enhanced public engagement with quantum science. © 2024, CC BY.

关键词： Students

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LST-1 observations of an enormous flare of BL Lacertae in 2021

arXiv

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arXiv 2023年

作者： Nozaki, Seiya Asano, Katsuaki Escudero, Juan Emery, Gabriel Priyadarshi, Chaitanya Abe, K. Abe, S. Aguasca-Cabot, A. Agudo, I. Crespo, N. Alvarez Antonelli, L.A. Aramo, C. Arbet-Engels, A. Arcaro, C. Artero, M. Asano, K. Aubert, P. Baktash, A. Bamba, A. Larriva, A. Baquero Baroncelli, L. de Almeida, U. Barres Barrio, J.A. Batkovic, I. Baxter, J. González, J. Becerra Bernardini, E. Bernardos, M.I. Medrano, J. Bernete Berti, A. Bhattacharjee, P. Biederbeck, N. Bigongiari, C. Bissaldi, E. Blanch, O. Bonnoli, G. Bordas, P. Bulgarelli, A. Burelli, I. Burmistrov, L. Buscemi, M. Cardillo, M. Caroff, S. Carosi, A. Carrasco, M.S. Cassol, F. Cauz, D. Cerasole, D. Ceribella, G. Chai, Y. Cheng, K. Chiavassa, A. Chikawa, M. Chytka, L. Cifuentes, A. Contreras, J.L. Cortina, J. Costantini, H. Dalchenko, M. Dazzi, F. De Angelis, A. de Lavergne, M. de Bony De Lotto, B. De Lucia, M. de Menezes, R. Del Peral, L. Deleglise, G. Delgado, C. Mengual, J. Delgado della Volpe, D. Dellaiera, M. Di Piano, A. Di Pierro, F. Di Pilato, A. Di Tria, R. Di Venere, L. Díaz, C. Dominik, R.M. Prester, D. Dominis Donini, A. Dorner, D. Doro, M. Eisenberger, L. Elsässer, D. Emery, G. Escudero, J. Ramazani, V. Fallah Ferrara, G. Ferrarotto, F. Fiasson, A. Foffano, L. Coromina, L. Freixas Fröse, S. Fukami, S. Fukazawa, Y. Garcia, E. López, R. Garcia Gasbarra, C. Gasparrini, D. Geyer, D. Paiva, J. Giesbrecht Giglietto, N. Giordano, F. Gliwny, P. Godinovic, N. Grau, R. Green, J. Green, D. Gunji, S. Günther, P. Hackfeld, J. Hadasch, D. Hahn, A. Hashiyama, K. Hassan, T. Hayashi, K. Heckmann, L. Heller, M. Llorente, J. Herrera Hirotani, K. Hoffmann, D. Horns, D. Houles, J. Hrabovsky, M. Hrupec, D. Hui, D. Hütten, M. Iarlori, M. Imazawa, R. Inada, T. Inome, Y. Ioka, K. Iori, M. Ishio, K. Martinez, I. Jimenez Jurysek, J. Kagaya, M. Karas, V. Katagiri, H. Kataoka, J. Kerszberg, D. Kobayashi, Y. Kohri, K. Kong, A. Kubo, H. Kushida, J. Lainez, M. Lamanna, G. Lamastra, A. Le Flour, T. Linhoff, M. Longo, F. López-Coto, R. Max-Planck-Institut für Physik Föhringer Ring 6 München80805 Germany Institute for Cosmic Ray Research University of Tokyo 5-1-5 Kashiwa-no-ha Chiba Kashiwa277-8582 Japan Instituto de Astrofísica de Andalucía-CSIC Glorieta de la Astronomía s/n Granada18008 Spain Aix Marseille Univ CNRS IN2P3 CPPM Marseille France The Barcelona Institute of Science and Technology Campus UAB Bellaterra Barcelona08193 Spain Department of Physics Tokai University Japan Institute for Cosmic Ray Research University of Tokyo Japan Departament de Física Quàntica i Astrofísica Institut de Ciències del Cosmos Universitat de Barcelona IEEC-UB Spain Instituto de Astrofísica de Andalucía-CSIC Spain EMFTEL department IPARCOS Universidad Complutense de Madrid Spain INAF - Osservatorio Astronomico di Roma Italy INFN Sezione di Napoli Italy Max-Planck-Institut für Physik Germany INFN Sezione di Padova Università degli Studi di Padova Italy The Barcelona Institute of Science and Technology Spain LAPP Univ. Grenoble Alpes Univ. Savoie Mont Blanc CNRS-IN2P3 Annecy France Universität Hamburg Institut für Experimentalphysik Germany Graduate School of Science University of Tokyo Japan Universidad del Azuay Ecuador INAF - Osservatorio di Astrofisica e Scienza dello spazio di Bologna Italy Centro Brasileiro de Pesquisas Físicas Brazil Instituto de Astrofísica de Canarias Departamento de Astrofísica Universidad de La Laguna Spain CIEMAT Spain Department of Physics TU Dortmund University Germany INFN Sezione di Bari Politecnico di Bari Italy INAF - Osservatorio Astronomico di Brera Italy INFN Sezione di Trieste Università degli Studi di Udine Italy University of Geneva Département de physique nucléaire et corpusculaire Switzerland INFN Sezione di Catania Italy Italy Aix Marseille Univ CNRS IN2P3 CPPM France INFN Sezione di Bari Università di Bari Italy INFN Sezione di Torino Italy Palacky University Olomouc Faculty of Science Czech Republic University of Alcalá UAH Spain P

The first prototype of LST (LST-1) for the Cherenkov Telescope Array has been in commissioning phase since 2018 and already started scientific observations with the low energy threshold around a few tens of GeV. In 2021, LST-1 observed BL Lac following the alerts based on multi-wavelength observations and detected prominent gamma-ray flares. In addition to the daily flux variability, LST-1 also detected sub-hour-scale intra-night variability reaching 3–4 times higher than the gamma-ray flux from the Crab Nebula above 100 GeV. In this proceeding, we will report the analysis results of LST-1 observations of BL Lac in 2021, especially focusing on flux variability. © 2023, CC BY.

关键词： Gamma rays

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Ductile-to-brittle transition and yielding in soft amorphous materials: perspectives and open questions

arXiv

引用

arXiv 2023年

作者： Divoux, Thibaut Agoritsas, Elisabeth Aime, Stefano Barentin, Catherine Barrat, Jean-Louis Benzi, Roberto Berthier, Ludovic Bi, Dapeng Biroli, Giulio Bonn, Daniel Bourrianne, Philippe Bouzid, Mehdi Del Gado, Emanuela Delanoë-Ayari, Hélène Farain, Kasra Fielding, Suzanne Fuchs, Matthias van der Gucht, Jasper Henkes, Silke Jalaal, Maziyar M. Joshi, Yogesh Lemaître, Anaël Leheny, Robert L. Manneville, Sébastien Martens, Kirsten Poon, Wilson C.K. Popović, Marko Procaccia, Itamar Ramos, Laurence Richards, James A. Rogers, Simon Rossi, Saverio Sbragaglia, Mauro Tarjus, Gilles Toschi, Federico Trappe, Véronique Vermant, Jan Wyart, Matthieu Zamponi, Francesco Zare, Davoud Molecular Macromolecular Chemistryand Materials ESPCI Paris Paris France Univ. de Lyon Universite Claude Bernard Lyon 1 CNRS Institut Lumiere Matiere VilleurbanneF-69622 France Soft Matter Group Van der Waals-Zeeman Institute University of Amsterdam Science Park 904 Amsterdam1098XH Netherlands Universite Montpellier CNRS Montpellier France SUPA and the School of Physics and Astronomy The University of Edinburgh Peter Guthrie Tait Road EdinburghEH9 3FD United Kingdom Universite Grenoble Alpes CNRS LIPhy Grenoble38000 France Laboratoire de Physique de l'Ecole Normale Superieure ENS Universite PSL CNRS Sorbonne Universite Universite de Paris ParisF-75005 France LPTMC CNRS-UMR 7600 Sorbonne Universite 4 Pl. Jussieu ParisF-75005 France Department of Physics Durham University South Road DurhamDH1 3LE United Kingdom Navier Ecole des Ponts Univ Gustave Eiffel CNRS Marne-la-Vallee France University of Geneva Quai Ernest-Ansermet 24 GenevaCH-1211 Switzerland Department of Physics and Astronomy Johns Hopkins University BaltimoreMD21218 United States Dipartimento di Fisica INFN Universita di Roma "Tor Vergata" Via della Ricerca Scientifica RomeI-00133 Italy Department of Applied Physics and Science Education Eindhoven University of Technology P.O. Box 513 Eindhoven9 5600 MB Netherlands CNR-IAC Via dei Taurini 19 Rome00185 Italy ENSL CNRS Laboratoire de physique LyonF-69342 France Max Planck Institute for the Physics of Complex Systems Nothnitzer Str.38 Dresden01187 Germany Georgetown University Department of Physics Institute for Soft Matter Synthesis and Metrology WashingtonDC United States Department of Materials ETH Zurich Vladimir Prelog Weg 5 Zurich8032 Switzerland Physical Chemistry and Soft Matter Wageningen University & Research Stippeneng 4 Wageningen6708WE Netherlands Univ. Grenoble Alpes CNRS Grenoble INP 3SR GrenobleF-38000 France PMMH ESPCI Paris France Fachbereich Physik Universitat Konstanz Konst

Soft amorphous materials are viscoelastic solids ubiquitously found around us, from clays and cementitious pastes to emulsions and physical gels encountered in food or biomedical engineering. Under an external deformation, these materials undergo a noteworthy transition from a solid to a liquid state that reshapes the material microstructure. This yielding transition was the main theme of a workshop held from January 9 to 13, 2023 at the Lorentz Center in Leiden. The manuscript presented here offers a critical perspective on the subject, synthesizing insights from the various brainstorming sessions and informal discussions that unfolded during this week of vibrant exchange of ideas. The result of these exchanges takes the form of a series of open questions that represent outstanding experimental, numerical, and theoretical challenges to be tackled in the near future. © 2023, CC BY.

关键词： Biomedical engineering

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β-delayed neutron emissions from N>50 gallium isotopes

引用

physical Review C 2023年第6期108卷 064307-064307页

作者： R. Yokoyama R. Grzywacz B. C. Rasco N. Brewer K. P. Rykaczewski I. Dillmann J. L. Tain S. Nishimura D. S. Ahn A. Algora J. M. Allmond J. Agramunt H. Baba S. Bae C. G. Bruno R. Caballero-Folch F. Calvino P. J. Coleman-Smith G. Cortes T. Davinson C. Domingo-Pardo A. Estrade N. Fukuda S. Go C. J. Griffin J. Ha O. Hall L. J. Harkness-Brennan J. Heideman T. Isobe D. Kahl M. Karny T. Kawano L. H. Khiem T. T. King G. G. Kiss A. Korgul S. Kubono M. Labiche I. Lazarus J. Liang J. Liu G. Lorusso M. Madurga K. Matsui K. Miernik F. Montes A. I. Morales P. Morrall N. Nepal R. D. Page V. H. Phong M. Piersa-Siłkowska M. Prydderch V. F. E. Pucknell M. M. Rajabali B. Rubio Y. Saito H. Sakurai Y. Shimizu J. Simpson M. Singh D. W. Stracener T. Sumikama H. Suzuki H. Takeda A. Tarifeño-Saldivia S. L. Thomas A. Tolosa-Delgado M. Wolińska-Cichocka P. J. Woods X. X. Xu Department of Physics and Astronomy University of Tennessee Knoxville Tennessee 37996 USA Center for Nuclear Study the University of Tokyo 2-1 Hirosawa Wako Saitama 351-0198 Japan Physics Division Oak Ridge National Laboratory Oak Ridge Tennessee 37830 USA TRIUMF Vancouver British Columbia V6T 2A3 Canada Instituto de Fisica Corpuscular (CSIC-Universitat de Valencia) E-46071 Valencia Spain RIKEN Nishina Center 2-1 Hirosawa Wako Saitama 351-0198 Japan MTA Atomki Bem ter 18/c Debrecen H4032 Hungary Department of Physics and Astronomy Seoul National University 1 Gwanak-ro Gwanak-gu Seoul 08826 Republic of Korea School of Physics and Astronomy University of Edinburgh EH9 3FD Edinburgh United Kingdom Universitat Politècnica de Catalunya (UPC) E-08028 Barcelona Spain STFC Daresbury Laboratory Daresbury Warrington WA4 4AD United Kingdom Department of Physics and Science of Advanced Materials Program Central Michigan University Mount Pleasant Michigan 48859 USA Department of Physics University of Liverpool Liverpool L69 7ZE United Kingdom Faculty of Physics University of WarsawPL-02-093 Warsaw Poland Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Institute of Physics Vietnam Academy of Science and Technology 10 Dao Tan Ba Dinh Hanoi Vietnam Department of Physics and Astronomy McMaster University Hamilton Ontario L8S 4M1 Canada Department of Physics University of Hong Kong Pokfulam Road Hong Kong National Physical Laboratory (NPL) Teddington Middlesex TW11 0LW United Kingdom Department of Physics University of Surrey Guildford GU2 7XH United Kingdom Department of Physics University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan National Superconducting Cyclotron Laboratory Michigan State University East Lansing Michigan 48824 USA University of Science Vietnam National University Hanoi 120062 Vietnam STFC Rutherford Appleton Laboratory Harwell Campus Didcot OX11 0QX United Kingdom Department of Physics Tennessee Techn

β-delayed γ-neutron spectroscopy has been performed on the decay of A=84 to 87 gallium isotopes at the RI-beam Factory at the RIKEN Nishina Center using a high-efficiency array of He3 neutron counters (BRIKEN). β−2n−γ events were measured in the decays of all of the four isotopes for the first time, which is direct evidence for populating the excited states of two-neutron daughter nuclei. Detailed decay schemes with the γ branching ratios were obtained for these isotopes, and the neutron emission probabilities (Pxn) were updated from the previous study. Hauser-Feshbach statistical model calculations were performed to understand the experimental branching ratios. We found that the P1n and P2n values are sensitive to the nuclear level densities of 1n daughter nuclei and showed that the statistical model reproduced the P2n/P1n ratio better when experimental levels plus shell-model level densities fit by the Gilbert-Cameron formula were used as the level-density input. We also showed the neutron and γ branching ratios are sensitive to the ground-state spin of the parent nucleus. Our statistical model analysis suggested J≤3 for the unknown ground-state spin of the odd-odd nucleus Ga86, from the Iγ(4+→2+)/Iγ(2+→0+) ratio of Ga84 and the P2n/P1n ratio. These results show the necessity of detailed understanding of the decay scheme, including data from neutron spectroscopy, in addition to γ measurements of the multineutron emitters.

关键词： Beta decay Electromagnetic transitions Level densities Nuclear structure & decays Thermal & statistical models 59 ≤ A ≤ 89

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Elongated Sn-Doped G-C3n4 as a Novel Photoelectrocatalyst for Water Oxidation

SSRN

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SSRN 2022年

作者： Revaprasadu, Neerish Aboubakr, Ahmed Esmail A. El Rouby, Waleed M.A. Khan, Malik Dilshad Hung, Chen-Hsiung Millet, Pierre Sustainable Chemical Science and Technology Taiwan International Graduate Program Taiwan Department of Applied Chemistry National Yang Ming Chiao Tung University Hsinchu30010 Taiwan Institute of Chemistry Academia Sinica 128 Sec 2 Academia Rd. Nankang Taipei11529 Taiwan Beni-Suef University Beni-Suef62511 Egypt Department of Chemistry University of Zululand Private Bag X1001 Kwadlangezwa3886 South Africa Institute of Physical Chemistry Polish Academy of Sciences Kasprzaka 44/52 Warsaw01-224 Poland Paris-Saclay University ICMMO-Eríee UMR CNRS 8182 Orsay91405 France

The photocatalytic performance of graphitic carbon nitride can be enhanced multifold by introducing suitable dopants. Here we report the incorporation of a cost-effective, non-toxic and abundant element, i.e., tin, in one-dimensional semiconducting carbon nitride (1D-g-C3N4). Various samples with different tin doping concentrations were prepared. A novel procedure was used to introduce varying amounts of tin to the 1D- g-C3N4 framework. The new photocatalysts (Sn-1D-g-C3N4) were characterized by p-XRD and FT-IR measurements, confirming the absence of tin oxide and the formation of tin-nitrogen bonds involving the 1D-g-C3N4 backbone. The SEM, EDX, and XPS measurements demonstrated the longitudinal morphology and the presence of tin in the hybrids. BET measurements showed a relative increase in the specific surface area for the composites. The optical measurements showed enhanced solar light absorption and promoted charge carriers’ separation after insertion of Sn to1D-g-C3N4. Photoelectrochemical water dissociation measurements showed that 10% tin doping increased the activity of 1D-g-C3N4 to water photo-oxidation about four times. This improvement was analyzed by electrochemical impedance spectroscopy measurements. © 2022, The Authors. All rights reserved.

关键词： Light absorption

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Ethylene Adsorption on Ag(111), Rh(111) and Ir(111) by(meta)-GGA based Density Functional Theory Calculations

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Chinese Journal of chemical physics 2019年第4期32卷 437-443,I0002页

作者： Pei-pei Chen Bing-yan Zhang Xiang-kui Gu Wei-xue Li State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China Department of Chemical Engineering and Materials Science Wayne State University Detroit MI 48202 USA Department of Chemical Physics College of Chemistry and Materials Science University of Science and Technology of China Hefei National Laboratory for Physical Sciences at the Microscale Hefei 230026 China University of Chinese Academy of Sciences Beijing 100049 China

Accurate description of the adsorption process of reactants on metal surfaces from theory is crucial for mechanistic understanding of activity and selectivity of metal catalysts, but it remains challengeable for the nowadays first-principles theory due to the lack of proper exchange-correlation functional describing the distinct interactions involved. We studied here the potential energy surfaces of ethylene adsorption on Ag(111), Rh(111) and Ir(111) using density functional theory calculations and (meta)-GGA functional including PBE, BEEF-vdW, SCAN, and SCAN+rVV10. For ethylene adsorption on noble metal Ag(111), it is found that BEEF-vdW, SCAN and SCAN+rVV10 predict the presence of the physisorption states only. For Rh(111), both SCAN and SCAN+rVV10 find that there is a precursor physisorption state before the chemisorption state. In contrast, there is no precursor state found based on potential energy surfaces from BEEF-vdW and PBE. Whereas for Ir(111), BEEF-vdW predicts the existence of a rather shallow precursor physisorption state, in addition to the chemisorption state. Irrespective to the transition metals considered, we find that SCAN+rVV10 gives the strongest binding strength, followed by SCAN, and PBE/BEEF-vdW, accordingly. The present work highlights great dependence of potential energy surface of ethylene adsorption on transition metal surfaces and exchange-correlation functionals.

关键词： Ethylene adsorption Potential energy curve Transition metal surface Exchange-correlation functionals First-principles theory

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High-Performance Plasma-Enabled Biorefining of Microalgae to Value-Added Products

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ChemSusChem 2019年第22期12卷 4976-4985页

作者： Zhou, Renwu Zhou, Rusen Zhang, Xianhui Fang, Zhi Wang, Xiaoxiang Speight, Robert Wang, Hongxia Doherty, William Cullen, Patrick J. Ostrikov, Kostya Bazaka, Kateryna School of Chemistry Physics and Mechanical Engineering Queensland University of Technology BrisbaneQLD4000 Australia Department of Electronic Science College of Physical Science and Technology Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance Institute of Electromagnetics and Acoustics Xiamen University Xiamen361005 China College of Electrical Engineering and Control Science Nanjing Tech University Nanjing210009 China Centre for Tropical Crops and Biocommodities Queensland University of Technology BrisbaneQLD4000 Australia School of Chemical and Biomolecular Engineering The University of Sydney SydneyNSW2006 Australia

Conversion of renewable biomass by time- and energy-efficient techniques remains an important challenge. Herein, plasma catalytic liquefaction (PCL) is employed to achieve rapid liquefaction of microalgae under mild conditions. The choice of the catalyst affects both the liquefaction efficiency and the yield of products. The acid catalyst is more effective and gave a liquid yield of 73.95 wt % in 3 min, as opposed to 69.80 wt % obtained with the basic catalyst in 7 min. Analyses of the thus-formed products and the processing environment reveal that the enhanced PCL performance is linked to the rapid increase in temperature under the effect of plasma-induced electric fields and the generation of large quantities of reactive species. Moreover, the obtained solid residue can be simply upgraded to a carbon product suitable for supercapacitor applications. Therefore, the proposed strategy may provide a new avenue for fast and comprehensive utilization of biomass under benign conditions. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

关键词： Microalgae

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Sn-Doped G-C3n4 as a Novel Photoelectrocatalyst for Water Oxidation

SSRN

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SSRN 2022年

作者： Aboubakr, Ahmed Esmail A. Khan, Malik Dilshad Revaprasadu, Neerish Millet, Pierre Hung, Chen-Hsiung El Rouby, Waleed M.A. Sustainable Chemical Science and Technology Taiwan International Graduate Program Taiwan Department of Applied Chemistry National Yang Ming Chiao Tung University Hsinchu30010 Taiwan Institute of Chemistry Academia Sinica 128 Sec 2 Academia Rd. Nankang Taipei11529 Taiwan Beni-Suef University Beni-Suef62511 Egypt Department of Chemistry University of Zululand Private Bag X1001 Kwadlangezwa3886 South Africa Institute of Physical Chemistry Polish Academy of Sciences Kasprzaka 44/52 Warsaw01-224 Poland Paris-Saclay University ICMMO-Eríee UMR CNRS 8182 Orsay91405 France

The photocatalytic performance of graphitic carbon nitride can be enhanced multifold by introducing suitable dopants. Here we report the incorporation of a cost-effective, non-toxic and abundant element, i.e., tin, in elongated semiconducting carbon nitride (g-C3N4). Various samples with different tin doping concentrations were prepared. A novel procedure was used to introduce varying amounts of tin to the g-C3N4 framework. The new photocatalysts (Sn-g-C3N4) were characterized by X-Ray Diffraction (XRD) and FT-IR measurements, confirming the absence of tin oxide and the formation of tin-nitrogen bonds involving the g-C3N4 backbone. The SEM, EDX, TEM and XPS measurements demonstrated the longitudinal morphology and the presence of tin in the hybrids. BET measurements showed a relative increase in the specific surface area for the composites. The optical measurements showed enhanced solar light absorption and promoted charge carriers’ separation after insertion of Sn to g-C3N4. Photoelectrochemical water dissociation measurements showed that 10% tin doping increased the activity of g-C3N4 to water photo-oxidation about four times. This improvement was analyzed by electrochemical impedance spectroscopy measurements. © 2022, The Authors. All rights reserved.

关键词： Morphology

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Coupled magnetic and structural phase transitions in the antiferromagnetic polar metal Pb2CoOsO6 under pressure

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physical Review B 2020年第14期102卷 144418-144418页

作者： Yuanyuan Jiao Yue-Wen Fang Jianping Sun Pengfei Shan Zhenhai Yu Hai L. Feng Bosen Wang Hanming Ma Yoshiya Uwatoko Kazunari Yamaura Yanfeng Guo Hanghui Chen Jinguang Cheng Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing 100190 China Laboratory for Materials and Structures & Tokyo Tech World Research Hub Initiative (WRHI) Institute of Innovative Research Tokyo Institute of Technology 4259 Nagatsuta Midori-ku Yokohama Kanagawa 226-8503 Japan NYU-ECNU Institute of Physics New York University Shanghai Shanghai 200062 China School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China Institute for Solid State Physics University of Tokyo Kashiwa Chiba 277-8581 Japan International Center for Materials Nanoarchitectonics (WPI-MANA) National Institute for Materials Science Tsukuba 305-0044 Japan Graduate School of Chemical Science and Engineering Hokkaido University Sapporo 060-0810 Japan Department of Physics New York University New York 10012 USA

Pb2CoOsO6 is a newly synthesized polar metal in which inversion symmetry is broken by the magnetic frustration in an antiferromagnetic ordering of Co and Os sublattices. The coupled magnetic and structural transition occurs at 45 K at ambient pressure. Here, we perform transport measurements and first-principles calculations to study the pressure effects on the magnetic/structural coupled transition of Pb2CoOsO6. Experimentally, we monitor the resistivity anomaly at TN under various pressures up to 11 GPa in a cubic anvil cell apparatus. We find that TN determined from the resistivity anomaly first increases quickly with pressure in a large slope of dTN/dP=+6.8(8)K/GPa for P<4GPa and, then, increases with a much reduced slope of 1.8(4) K/GPa above 4 GPa. Our first-principles calculations suggest that the observed discontinuity of dTN/dP around 4 GPa may be attributed to the vanishing of the Os magnetic moment under pressure. Pressure substantially reduces the Os moment and completely suppresses it above a critical value, which relieves the magnetic frustration in the antiferromagnetic ordering of Pb2CoOsO6. The Co and Os polar distortions decrease with the increasing pressure and simultaneously vanish at the critical pressure. Therefore, above the critical pressure, a new centrosymmetric antiferromagnetic state emerges in Pb2CoOsO6, distinct from the one under ambient pressure, thus, showing a discontinuity in dTN/dP.

关键词： Antiferromagnetism Density of states Electronic structure Magnetic phase transitions Magnetoelectric effect Transport phenomena Multiferroics Noncentrosymmetric materials Transition metal oxides Density functional calculations Pressure techniques Resistivity measurements

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The ALMA-QUARKS survey: Detection of two extremely dense substructures in a massive prestellar core

arXiv

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arXiv 2024年

作者： Mai, Xiaofeng Liu, Tie Liu, Xunchuan Zhu, Lei Garay, Guido Goldsmith, Paul F. Juvela, Mika Liu, Hongli Mannfors, Emma Tej, Anandmayee Sanhueza, Patricio Li, Shanghuo Xu, Fengwei Semadeni, Enrique Vazquez Jiao, Wenyu Peng, Yaping Baug, T. Yang, Aiyuan Dewangan, Lokesh Bronfman, Leonardo Gómez, Gilberto C. Palau, Aina Lee, Chang Won Qin, Sheng-Li Tatematsu, Ken'ichi Chibueze, James O. Yang, Dongting Lu, Xing Luo, Qiuyi Gu, Qilao Issac, Namitha Zhang, Suinan Li, Pak-Shing Zhang, Bo Tóth, L. Viktor Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai200030 China School of Astronomy and Space Sciences University of Chinese Academy of Sciences No. 19A Yuquan Road Beijing100049 China Chinese Academy of Sciences South America Center for Astronomy National Astronomical Observatories Chinese Academy of Sciences Beijing100101 China Departamento de Astronomía Universidad de Chile Las Condes Santiago7591245 Chile Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive PasadenaCA91109 United States Department of Physics University of Helsinki P.O. box 64 FI-00014 Finland Department of Astronomy Yunnan University Kunming650091 China Indian Institute of Space Science and Technology Thiruvananthapuram695 547 India National Astronomical Observatory of Japan National Institutes of Natural Sciences 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Astronomical Science Program The Graduate University for Advanced Studies SOKENDAI 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Max Planck Institute for Astronomy Königstuhl 17 HeidelbergD-69117 Germany Kavli Institute for Astronomy and Astrophysics Peking University 5 Yiheyuan Road Haidian District Beijing100871 China Instituto de Radioastronomía y Astrofísica Universidad Nacional Autónoma de México Antigua Carretera a Pátzcuaro 8701 Ex-Hda. San José de la Huerta Michoacán Morelia58089 Mexico Department of Astronomy School of Physics Peking University Beijing100871 China Department of Physics Faculty of Science Kunming University of Science and Technology Kunming650500 China S. N. Bose National Centre for Basic Sciences Block JD Sector III Salt Lake Kolkata700106 India National Astronomical Observatories Chinese Academy of Sciences A20 Datun Road Chaoyang District Beijing100101 China Physical Research Laboratory Navrangpura Ahmedabad380009 India Departamento de Astronomá Universidad de Chile Las Condes Santiago7591245 Chile Korea Astronomy and Space Scien

Only a handful of massive starless core candidates have been discovered so far, but none of them have been fully confirmed. Within the MM1 clump in the filamentary infrared dark cloud G34.43+0.24 that was covered by the ALMA-ATOMS survey at Band 3 (∼ 2'', 6000 au) and the ALMA-QUARKS survey at Band 6 (∼ 0.3'', 900 au), two prestellar core candidates MM1-C and E1 with masses of 71 and 20 Mo and radii of 2100-4400 au were discovered. The two cores show no obvious sign of star-formation activities. In particular, MM1-C is a very promising massive prestellar core candidate with a total gas mass of 71 Mo. Within MM1-C, we detected two extremely dense substructures, C1 and C2, as characterized by their high densities of nH2 ∼ 108-9cm-3. Moreover, evidence of further fragmentation in C2 was also revealed. We have detected the primordial fragmentation in the earliest stage of massive star formation, and we speculate that MM1-C would be the birthplace of a massive multiple system. However, we cannot fully rule out the possibility that the massive prestellar core MM1-C will just form a cluster of low-mass stars if it undergoes further fragmentation. Copyright © 2024, The Authors. All rights reserved.

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