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作者： Ibrahem, Mohammed Aziz Wei, Hung-Yu Tsai, Meng-Hung Ho, Kuo-Chuan Shyue, Jing-Jong Chu, Chih Wie Department of Physics National Taiwan University Taipei 106 Taiwan Research Center of Applied Science Academia Sinica Taipei 115 Taiwan Nanoscience and Technology Program Taiwan International Graduate Program Academia Sinica Taipei 115 Taiwan Institute of Polymer Science and Engineering National Taiwan University Taipei 10617 Taiwan Department of Material Science and Engineering National Taiwan University Taipei 106 Taiwan Department of Photonics National Chiao Tung University Hsinchu 300 Taiwan

This paper describes inverted bulk heterojunction organic solar cells featuring solution-processed zinc oxide nanoparticles (ZnO NPs) as an electron extraction layer, prepared at relatively low annealing temperatures (≤150°C). A solution of ZnO NPs (average size: 25 nm) was prepared using a wet grinding method. When the ZnO interlayer was present in the solar cell, the vertical phase separation of the active layers prepared with and without solvent annealing exhibited similar gradient concentrations and, therefore, similar photocurrent generation, both of which were superior to those of conventional devices incorporating a poly(3,4-ethylenedioxythiophene): poly(styrene sulfonic acid) (PEDOT:PSS) hole extraction layer. We attribute this vertical phase separation to the similar surface energies of the fullerene derivative and the ZnO interlayer. Under simulated air mass (AM) 1.5 G illumination at 100 mW cm-2, the power conversion efficiency of the optimized device was approximately 4%. © 2012 Elsevier B.V.

关键词： Zinc oxide

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Dual view on sliding phases in U(1) symmetric systems

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Physical Review B 2017年第9期95卷 094101-094101页

作者： S. Vayl A. B. Kuklov V. Oganesyan Department of Engineering Science and Physics College of Staten Island CUNY Staten Island New York 10314 USA and Physics Program The Graduate Center CUNY New York New York 10016 USA

The proposal of sliding phases (SP) is revisited from the perspective of duality. A generic argument is formulated as essentially a no-go theorem for SP in translationally invariant nonfrustrated systems with short-range interactions—classical or quantum. Its validity is demonstrated on an asymmetric bilayer and its multilayer variation models where the duality allows obtaining asymptotically exact analytical solution. This solution is in drastic contrast with the perturbative renormalization group prediction and is strongly supported by Monte Carlo simulations. An alternative path toward finding SP is suggested. Its key ingredient is a long-range gauge-type interaction suppressing the interlayer Josephson coupling.

关键词： Phase transitions Renormalization group

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Data-driven density functional model for atomic nuclei

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Physical Review C 2024年第6期109卷 064312-064312页

作者： Zu-Xing Yang Xiao-Hua Fan Zhi-Pan Li Haozhao Liang Wako Saitama 351-0198 Japan School of Physical Science and Technology Department of Physics Graduate School of Science RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program Wako 351-0198 Japan

Through ensemble learning with multitasking and complex connection neural networks, we aggregated nuclear properties, including ground-state density distributions, charge radii, and binding energies obtained from the Kohn-Sham auxiliary single-particle systems. The root-mean-squared (RMS) error in describing binding energies is reduced to about 500 keV, while the RMS error in describing charge radii is decreased to about 0.017 fm. In addition, by using the correlation between densities and binding energies, we discuss the impact of various densities and nuclear radii on the binding energy and find the neutron-skin thickness of Pb208 to be around 0.220fm. The present paper provides a new way to accelerate the integration of machine learning into nuclear density functional theory.

关键词： Nuclear binding Nuclear radii Nuclear structure & decays Nucleon distribution

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Analysis of neutron monitor count rates and timing distributions from latitude surveys 18

Analysis of neutron monitor count rates and timing distribut...

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18th Siam physics Congress, SPC 2023

作者： Yakum, P. Khamphakdee, S. Nuntiyakul, W. Sáiz, A. Ruffolo, D. Evenson, P. Bangliang, C. Seripienlert, A. Jiang, P. Chuanraksasat, P. Munakata, K. Madsen, J. Soonthornthum, B. Komonjinda, S. Graduate Program in Astronomy Department of physics and materials Faculty of science Chiang Mai University Chiang Mai50200 Thailand Department of physics and materials Faculty of science Chiang Mai University Chiang Mai50200 Thailand Department of Physics Faculty of Science Mahidol University Bangkok10400 Thailand Department of Physics and Astronomy University of Delaware NewarkDE19716 United States Department of Physics Faculty of Science and Technology Rajamangala University of Technology Thanyaburi Pathum Thani12110 Thailand Chiang Mai50180 Thailand Polar Research Institute of China Shanghai Pudong200136 China Physics Department Shinshu University Nagano Matsumoto390-8621 Japan Wisconsin IceCube Particle Astrophysics Center University of Wisconsin-Madison WI53703 United States

Neutron monitors continuously record the hadronic part of secondary atmospheric radiation on the ground, which originates from primary cosmic rays. In Thailand, we developed a mobile neutron monitor housed inside a standard-size shipping container named "Changvan." It contains three neutron-sensitive proportional counters set up in the typical NM64 layout. However, the central counter doesn't have the lead producer, leading us to refer to it as a "semi-leaded" neutron monitor. We examined cosmic ray spectral variations on two latitude surveys during 2018-2019 and 2019-2020. This work examines the ratio of count rates between leaded and unleaded setups, which shows notable variation based on geomagnetic cutoff rigidity, suggesting a sensitivity to the cosmic ray spectrum. This measurement could be implemented at stationary stations. The unleaded counter, shielded by the reflector with a higher count from nearby lead, may have advantages over a bare one. Furthermore, we explore alternative techniques to identify spectral changes in Galactic cosmic rays using Changvan data. We analyze using time delay histograms to determine the leader fraction (L) of neutrons that are not preceded by another neutron from the same primary cosmic ray. We also examine other parameters, including the alpha (α) parameter and pulse rate (PR), which can be compared with count rates (CR). Our findings indicate that the ratios of L and α are not significantly affected by geomagnetic cutoff rigidity. In contrast, CR and PR exhibit significant dependency and show opposite trends. © 2023 Institute of physics Publishing. All rights reserved.

关键词： Cosmic rays

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Terahertz Magnetospectroscopy of Gadolinium Gallium Garnet in Fields up to 25 T

Terahertz Magnetospectroscopy of Gadolinium Gallium Garnet i...

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JSAP-OSA Joint Symposia, JSAP 2021

作者： Bao, J. Peraca, N. Marquez Tay, F. Kritzell, T.E. Li, X. Noe, G.T. Katayama, I. Takeda, J. Nojiri, H. Yamahara, H. Tabata, H. Baydin, A. Kono, J. Department of Physics and Astronomy Rice University HoustonTX United States Department of Electrical and Computer Engineering Rice University HoustonTX United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX United States Department of Physics Graduate School of Engineering Science Yokohama National University Yokohama Japan Institute for Materials Research Tohoku University Sendai Japan Department of Electrical Engineering and Information Systems Graduate School of Engineering University of Tokyo Japan Smalley-Curl Institute Rice University HoustonTX United States Department of Materials Science and NanoEngineering Rice University HoustonTX United States

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Solar Magnetic Polarity Effect on Neutron Monitor Count Rates: Comparing Latitude Surveys and Antarctic Stations 38

Solar Magnetic Polarity Effect on Neutron Monitor Count Rate...

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38th International Cosmic Ray Conference, ICRC 2023

作者： Poopakun, K. Nuntiyakul, W. Khamphakdee, S. Seripienlert, A. Ruffolo, D. Evenson, P. Jiang, P. Chuanraksasat, P. Munakata, K. Duldig, M.L. Humble, J.E. Madsen, J. Soonthornthum, B. Komonjinda, S. Graduate Program in Astronomy Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai50200 Thailand Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai50200 Thailand Chiang Mai50180 Thailand Department of Physics Faculty of Science Mahidol University Bangkok10400 Thailand Department of Physics and Astronomy University of Delaware NewarkDE19716 United States Polar Research Institute of China Shanghai Pudong200136 China Physics Department Shinshu University Nagano Matsumoto390-8621 Japan School of Natural Sciences University of Tasmania HobartTAS7001 Australia Wisconsin IceCube Particle Astrophysics Center University of Wisconsin-Madison WI53703 United States

The Galactic cosmic ray spectrum manifests pronounced variations over the 11-year sunspot cycle and more subtle variations over the 22-year solar magnetic cycle. An important tool to study these variations is repeated latitude surveys with neutron monitors onboard icebreakers in conjunction with land-based references. We revisit 13 annual latitude surveys from 1994 to 2007 using reference data from Mawson instead of McMurdo (closed in 2017). We then consider two more latitude surveys (2018 and 2019) with a monitor similar to the 3NM64 in the previous surveys but without lead rings around the central tube, a so-called "semi-leaded neutron monitor." The new surveys extend the linear relationship among data taken at different cutoff rigidity. They also confirm the "crossover" in spectra measured near solar minima during epochs of opposite solar magnetic polarity and the absence of crossover for epochs having the same solar magnetic polarity. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Neutrons

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Nonlinearity-Induced Nonreciprocity in Passive Silicon Gratings Supporting Quasi-Bound States in the Continuum

Nonlinearity-Induced Nonreciprocity in Passive Silicon Grati...

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CLEO: QELS_Fundamental science, QELS 2022

作者： Cotrufo, Michele Cordaro, Andrea Polman, Albert Alù, Andrea Photonics Initiative Advanced Science Research Center City University of New York New YorkNY10031 United States Van der Waals-Zeeman Institute Institute of Physics University of Amsterdam Science Park 904 Amsterdam1098 XH Netherlands Center for Nanophotonics AMOLF Science Park 104 Amsterdam1098 XG Netherlands Physics Program Graduate Center of the City University of New York New YorkNY10016 United States

ISBN: (纸本)9781557528209

Optical nonlinearities, combined with structural asymmetry, can break reciprocity and realize devices that transmit light asymmetrically. We show the first experimental implementation of this concept for free-space radiation, using silicon metasurfaces supporting asymmetric quasi-bound states. © Optica Publishing Group 2022, © 2022 The Author(s)

关键词： Silicon

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Dual-color nonlinear optical microscope imaging and its applications

Dual-color nonlinear optical microscope imaging and its appl...

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International Conference on Quantum Electronics (IQEC)

作者： Jang Hyuk Lee Dae Sik Choi Dong Hoon Song Eun Hee Cho Sang-Mo Shin Myoung-Kyu Oh Do-Kyeong Ko Graduate Program of Photonics and Applied Physics Gwangju Institute of Science and Technology Gwangju South Korea Graduate program of Medical System Engineering Gwangju Institute of Science and Technology Gwangju South Korea Advanced Photonics Research Institute Gwangju Institute of Science and Technology Gwangju South Korea

A photonic crystal fiber (PCF) based dual-color nonlinear microscope that combines coherent anti-Stokes Raman scattering (CARS) microscopy and two-photon excitation fluorescence (TPEF) microscopy was developed and app... 详细信息

ISBN: (纸本)9780977565771

关键词： Microscopy Optical microscopy Laser excitation Band pass filters Multiplexing Nonlinear optics

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Highly selective hydrogen sensing of Pt-loaded WO3 synthesized by hydrothermal/impregnation methods

Highly selective hydrogen sensing of Pt-loaded WO3 synthesiz...

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作者： Samerjai, Thanittha Liewhiran, Chaikarn Wisitsoraat, Anurat Tuantranont, Adisorn Khanta, Chanitpa Phanichphant, Sukon Nanoscience and Nanotechnology Program Faculty of Graduate School Chiang Mai University Chiang Mai 50200 Thailand Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Nanoelectronics and MEMS Laboratory National Electronics and Computer Technology Center KlongLuang Pathumthani 12120 Thailand Materials Science Research Center Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand

Unloaded and 0.25-1.0 wt% Pt-loaded WO3 nanoparticles were synthesized by hydrothermal method using sodium tungstate dihydrate and sodium chloride as precursors in an acidic condition and impregnated using platinum acetylacetonate. Pt-loaded WO3 films on an Al2O 3 substrate with interdigitated Au electrodes were prepared by spin-coating technique. The response of WO3 sensors with different Pt-loading concentrations was tested towards 0.01-1.0 vol% of H2 in air as a function of operating temperature (200-350 °C). The 1.0 wt% Pt-loaded WO3 sensing film showed the highest response of ∼2.16 × 104 to 1.0 vol% H2 at 250 °C. Therefore, an operating temperature of 250 °C was optimal for H2 detection. The responses of 1.0 wt% Pt-loaded WO3 sensing film to other flammable gases, including C2H5OH, C2H4 and CO, were considerably less, demonstrating Pt-loaded WO3 sensing film to be highly selective to H2. © 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

关键词： Tungsten compounds

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Z-Laminating Assembly of Graphene Nanoflakes for Super-Strong Membranes and Functional Coatings

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ACS Applied Nano Materials 2024年第13期7卷 14957-14963页

作者： Santos, Ian Daniell Tjarks, Patrick Muthu, Jeyavelan Lin, You-Chen Yen, Zhi-Long Chand, Pradyumna Kumar Raman, Radha Nguyen, Dinh Tuan Rouhani, Mehdi Jeng, Yeau-Ren Hsieh, Ya-Ping Hofmann, Mario Department of Physics National Taiwan University Taipei 106 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica and National Taiwan University Taipei 106 Taiwan J. Heyrovsky Institute of Physical Chemistry of the Czech Academy of Sciences Prague 18200 Czech Republic Institute of Atomic and Molecular Sciences Academia Sinica Taipei 106 Taiwan Department of Chemistry National Taiwan University Taipei 106 Taiwan Department of Physics National Central University Taoyuan 320 Taiwan Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica and National Central University Taipei 106 Taiwan Department of Biomedical Engineering National Cheng Kung University 1 University Road Tainan 70101 Taiwan Department of Materials Science and Engineering National Cheng Kung University Tainan 70101 Taiwan Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng-Kung University (NCKU) Tainan 70101 Taiwan

We demonstrate the strengthening of graphene, an atomically thin carbon allotrope, by out-of-plane folding. Through lateral confinement of graphene at the water-air interface, nanoscale buckling was induced in suspended flakes, leading to an unexpected folding transition beyond a critical surface pressure. The emergence of folding was confirmed by in situ Brewster angle reflectivity and ex situ microscopy, showing a unique “z-laminated” nanostructure. Molecular dynamics simulations indicate that z-lamination yields an enhanced adhesion between neighboring flakes compared to lateral sliding, which was confirmed by a surface pressure hysteresis during the folding process. Mechanical testing reveals superior Young’s modulus and yield strength when compared to conventional graphene assemblies and even compared to composites. We demonstrate the potential of the z-lamination approach for applications in graphene-based structural materials, tribological layers, and functional electrochemical coatings. Finally, the complete recyclability of z-laminated graphene opens up new routes toward sustainable nanostructured materials. © 2024 The Authors. Published by American Chemical Society

关键词： 2D materials composites laminated graphene membranes recyclable

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