检索结果-内蒙古大学图书馆

arXiv 2024年

作者： Zhang, Wenna Hu, Yutao Zhang, Hongyi Liu, Xiang Shen, Yuecheng Veronis, Georgios Alù, Andrea Huang, Yin Luo, Wenchen School of Physics Central South University Changsha410083 China Shenzhen Institute for Quantum Science and Engineering Southern university of science and technology Shenzhen518055 China State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai200241 China School of Electrical Engineering and Computer Science Louisiana State University Baton RougeLA70803 United States Center for Computation and Technology Louisiana State University Baton RougeLA70803 United States Photonics Initiative Advanced Science Research Center City University of New York New YorkNY10031 United States Physics Program Graduate Center City University of New York New YorkNY10026 United States

The skin effect, where bulk modes collapse into boundary modes, is a key phenomenon in topological non-Hermitian systems, has been predominantly studied in spinless systems. Recent studies illustrate the magnetic suppression of the first-order skin effect while ignoring spin. However, the physical significance of a magnetic field in non-Hermitian skin effect with spin remains elusive. Here, we systematically explore non-Hermitian spinful systems based on generalized Hatano-Nelson models with SU(2) gauge potential fields. In an open one-dimensional lattice, the spin-up and spin-down states can be uniquely separated and localized at the two boundaries without magnetic field. When an external magnetic field is applied, the skin effect exhibits a smooth transition from bidirectional to unidirectional. Remarkably, we demonstrate that the first-order skin effect can be anomalously induced by a magnetic field in a topologically trivial non-Hermitian spinful system without any skin effect at zero field. The direction of such magnetically induced skin modes can be controlled by simply changing the amplitude and polarity of the magnetic field. In addition, we demonstrate a transition between non-Bloch PT and anti-PT symmetries in the system, and uncover the spin-dependent mechanism of non-Bloch PT symmetry. Our results pave the way for the investigation of non-Hermitian skin effect with spin degrees of freedom. © 2024, CC BY.

关键词： Magnetic field effects

来源：评论

学校读者我要写书评

暂无评论

Addressing challenges for operating electrochemical solar fuels technologies under variable and diurnal conditions

引用

Frontiers in Energy Research 2024年 12卷

作者： Yap, Kyra M. K. Lee, Sol A. Kistler, Tobias A. Collins, Darci K. Warren, Emily L. Atwater, Harry A. Jaramillo, Thomas F. Xiang, Chengxiang Nielander, Adam C. Department of Chemical Engineering Stanford University StanfordCA United States SUNCAT Center for Interface Science and Catalysis SLAC National Accelerator Laboratory Menlo ParkCA United States Department of Applied Physics and Materials Science California Institute of Technology PasadenaCA United States Chemical Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA United States Chemistry and Nanoscience Center National Renewable Energy Laboratory GoldenCO United States Advanced Energy Systems Graduate Program Colorado School of Mines GoldenCO United States

The outdoor operation of electrochemical solar fuels devices must contend with challenges presented by the cycles of solar irradiance, temperature, and other meteorological factors. Herein, we discuss challenges associated with these fluctuations presented over three timescales, including the effects of diurnal cycling over the course of many days, a single diurnal cycle over the course of hours, and meteorological phenomena that cause fluctuations on the order of seconds to minutes. We also highlight both reaction-independent and reaction-specific effects of variable conditions for the hydrogen evolution reaction and CO2 reduction reaction. We identify key areas of research for advancing the outdoor operation of solar fuels technology and highlight the need for metrics and benchmarks to enable the comparison of diurnal studies across systems and geographical locations. Copyright © 2024 Yap, Lee, Kistler, Collins, Warren, Atwater, Jaramillo, Xiang and Nielander.

关键词： Hydrogen fuels

来源：评论

学校读者我要写书评

暂无评论

Large-scale structure with superhorizon isocurvature dark energy

引用

Physical Review D 2022年第8期105卷 083531-083531页

作者： Koki Yamashita Yue Nan Yuuki Sugiyama Kazuhiro Yamamoto Department of Physics Kyushu University Motooka 744 Fukuoka 819-0395 Japan Physics Program Graduate School of Advanced Science and Engineering Hiroshima University 1-3-1 Kagamiyama Higashi-hiroshima 739-8526 Japan Kavli Institute for the Physics and Mathematics of the Universe (WPI) The University of Tokyo Institutes for Advanced Study The University of Tokyo Kashiwa Chiba 277-8583 Japan Research Center for Advanced Particle Physics Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan

The standard cosmological model assumes a homogeneous and isotropic universe as the background spacetime on large scales called the cosmological principle. However, some observations suggest the possibility of an inhomogeneous and anisotropic universe at large scales. In this paper, we investigate a model of the Universe with random inhomogeneities and anisotropies on very large scales, motivated by the supercurvature dark energy model in Nan et al. [Phys. Rev. D 99, 103512 (2019)]. In this model, the authors introduced a scalar field with O(1) inhomogeneities on a scale sufficiently larger than the current horizon scale (superhorizon scale), and the potential energy of the scalar field explains the accelerating expansion, with slight deviations from the cosmological principle. We aim at clarifying the theoretical prediction on the large-scale structure (LSS) of the matter component in this model. Based on the work on the superhorizon scale fluctuations (superhorizon mode) presented in Y. Nan and K. Yamamoto [Phys. Rev. D 105, 063518 (2022)], we derive the equations that the perturbative components to the LSS obey as a generalization of the cosmological perturbations theory, which is solved to find the influence of the dark energy inhomogeneities on the formation of the LSS. Finally, we show that the model can be consistent with observations by comparing the σ8 predicted by the numerical solution of the model with the σ8 indicated by observations such as Planck and the Sloan Digital Sky Survey.

关键词： Cosmology Dark energy Evolution of the Universe Large scale structure of the Universe

来源：评论

学校读者我要写书评

暂无评论

Radiative hadronization: Photon emission at hadronization from quark-gluon plasma

arXiv

引用

arXiv 2022年

作者： Fujii, Hirotsugu Itakura, Kazunori Miyachi, Katsunori Nonaka, Chiho Institute of Physics University of Tokyo Komaba Tokyo153-8902 Japan Nagasaki Institute of Applied Science Nagasaki851-0193 Japan KEK Theory Center IPNS KEK Tsukuba305-0801 Japan Department of Physics Nagoya University Nagoya464-8602 Japan Physics Program Graduate School of Advanced Science and Engineering Hiroshima University Higashi Hiroshima739-8526 Japan Nagoya University Nagoya464-8602 Japan

We investigate photon emission at the hadronization stage from a quark-gluon plasma created in relativistic heavy-ion collisions. A recombination-model picture suggests that a quark and an antiquark bind into a meson state in hadronization, which would apparently violate the energy conservation if there is nothing else involved. We consider here a hadronization process where the recombination accompanies a photon emission. This is an analog of the "radiative recombination" known in plasma physics, such as e− + p+ → H0 + γ, which occurs when an electromagnetic plasma goes back to a neutral atomic gas. The "radiative hadronization" picture will bring about (i) an enhancement of the photon yield, (ii) significant flow of photons similar to that of hadrons, and (iii) the photon transverse momentum (pT) distribution with a thermal profile whose effective temperature is given by blue-shifted temperature of quarks. Here as a simplest and phenomenological realization of the radiative hadronization, we modify the recombination model to involve a photon emission and evaluate the photon yield with this modified model. Adding this contribution to the direct photon yield along with thermal photon contribution calculated with a hydrodynamic model and a parametrized contribution of prompt photons, we study the pT spectrum and elliptic flow of the photons produced in heavy-ion collisions at RHIC and LHC energies. © 2022, CC BY-NC-ND.

关键词： Photons

来源：评论

学校读者我要写书评

暂无评论

Photon Production in High-Energy Heavy-Ion Collisions: Thermal Photons and Radiative Recombination

arXiv

引用

arXiv 2022年

作者： Fujii, Hirotsugu Itakura, Kazunori Miyachi, Katsunori Nonaka, Chiho Institute of Physics University of Tokyo Komaba Tokyo153-8902 Japan Nagasaki Institute of Applied Science Nagasaki851-0193 Japan KEK Theory Center IPNS KEK Tsukuba305-0801 Japan Department of Physics Nagoya University Nagoya464-8602 Japan Physics Program Graduate School of Advanced Science and Engineering Hiroshima University Higashi-Hiroshima739-8526 Japan Nagoya University Nagoya464-8602 Japan

We present a comprehensive analysis of photon production at RHIC and the LHC, proposing radiative hadronization as an additional photon source in high-energy heavy-ion collisions. For thermal photon, we perform relati... 详细信息

关键词： Heavy ions

来源：评论

学校读者我要写书评

暂无评论

Mechanical waves identify the amputation position during wound healing in the amputated zebrafish tailfin

引用

Nature physics 2023年第9期19卷 1362-1370页

作者： De Leon, Marco P. Wen, Fu-Lai Paylaga, Giovanni J. Wang, Ying-Ting Roan, Hsiao-Yuh Wang, Chung-Han Hsiao, Chung-Der Lin, Keng-Hui Chen, Chen-Hui Institute of Cellular and Organismic Biology Academia Sinica Taipei Taiwan Molecular and Biological Agricultural Sciences Taiwan International Graduate Program Graduate Institute of Biotechnology National Chung-Hsing University Taichung Taiwan Institute of Physics Academia Sinica Taipei Taiwan International Center for Wound Repair and Regeneration National Cheng Kung University Tainan Taiwan Department of Science Education National Taipei University of Education Taipei Taiwan Department of Physics National Central University Chung-Li Taiwan Department of Physics Mindanao State University Iligan Institute of Technology Iligan City Philippines Department of Bioscience Technology Chung Yuan Christian University Chung-Li Taiwan Department of Physics National Taiwan University Taipei Taiwan

Highly regenerative animals can regrow lost appendages and the rate of regrowth is proportional to the amount of appendage loss. This century-old phenomenon prompted us to investigate whether the mechanism of wound healing, as the first stage of regeneration, is responsible for discerning the amputation position. In vitro studies have revealed great insights into the mechanics of the wound-healing process, including the identification of mechanical waves in collective epithelial cell expansion. It has been suggested that these mechanical waves may also be involved in positional sensing. Here we perform live-cell imaging on adult zebrafish tailfins to monitor the collective migration of basal epithelial cells on tailfin amputation. We observed a cell density wave propagating away from the amputation edge, with the maximum travelling distance proportional to the amputation level and cell proliferation at later stages. We developed a mechanical model to explain this wave behaviour, including the tension-dependent wave speed and amputation-dependent travelling distance. Together, our findings point to an in vivo positional sensing mechanism in regenerative tissues based on a coupling of mechanical signals manifested as a travelling density wave. © 2023, The Author(s), under exclusive licence to Springer Nature Limited.

关键词： Cell proliferation

来源：评论

学校读者我要写书评

暂无评论

Photoluminescence of oxygen vacancy-rich nano-TiO2 photocatalyst for methylene blue color degradation

引用

Materials science and Engineering: B 2025年 320卷

作者： Simanjuntak, Mayer Made Joni, I. Faizal, Ferry Gultom, Noto Susanto Kuo, Dong-Hau Panatarani, Camellia Department of Physics Faculty of Mathematic and Natural Sciences Universitas Padjadjaran Jl. Raya Bandung-Sumedang KM 21 Jatinangor Sumedang45363 Indonesia Study Program of Biotechnology Faculty of Graduate School Universitas Padjadjaran Jl. Dipati Ukur No.35 Coblong Bandung40132 Indonesia Functional Nano Powder University Center of Excellence Universitas Padjadjaran Jl. Raya Bandung-Sumedang KM 21 Jatinangor Sumedang45363 Indonesia Department of Materials Science and Engineering National Taiwan University of Science and Technology No.43 Sec. 4 Keelung Road Taipei10607 Taiwan

Wastewater containing synthetic dyes poses a critical environmental hazard, necessitating the development of effective treatment techniques. Despite its promise as a photocatalyst, TiO2′s inability to efficiently absorb visible light limits its practical use. To overcome this limitation, oxygen vacancy (OV) engineering was carried out in TiO2 through solvothermal at temperatures of 150°C, 180°C, and 210°C. Comprehensive analyses confirmed a temperature-induced increase in crystallinity and OV concentration. Furthermore, photoluminescence analysis revealed mid-gap states that improve visible light absorption. Notably, the T150 sample achieved 93.43% degradation of methylene blue within 3 h under sunlight, outperforming commercial TiO2. The superior performance was attributed to a reduced bandgap energy, enhanced charge carrier separation, and increased generation of reactive oxygen species, all facilitated by an optimal concentration of OV. This study clarifies the interaction between photoluminescence and photocatalytic activity, highlighting OV engineering as a highly effective strategy for developing advanced TiO2-based materials for wastewater treatment. © 2025 Elsevier B.V.

关键词： Photocatalytic activity

来源：评论

学校读者我要写书评

暂无评论

Growth of Gd0.3ca2.7co3.82cu0.18o9-Δ-Bace0.6zr0.2y0.2o3-Δ Bulk Heterojunction Cathode Interlayer by Pulsed Laser Deposition for Enhancing Protonic Solid Oxide Fuel Cell Performance

SSRN

引用

SSRN 2023年

作者： Umer, Muhammad Abdullah Cheng, Cheng-Yang Lai, Bo-Ruei Tseng, Chung-Jen Chen, Szu-Yuan Lee, Sheng-Wei Molecular Science and Technology program Taiwan International Graduate Program Academia Sinica Taipei City106923 Taiwan Department of Physics National Central University Taoyuan City320317 Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei City106923 Taiwan Institute of Materials Science and Engineering National Central University Taoyuan City320317 Taiwan Department of Mechanical Engineering National Central University Taoyuan City320317 Taiwan Department of Chemical and Materials Engineering National Central University Taoyuan City320317 Taiwan

The triple-conducting (e-/H+/O2-) oxides have been extensively studied as the most promising cathode materials for protonic solid oxide fuel cells (P-SOFCs) because of their excellent catalytic activity at lower operating temperatures. However, direct application of these cathode materials by brush-painting or screen-printing provides limited contact area with the underlying electrolyte layer, resulting in high cathode ohmic and polarization resistances. In this study, it is demonstrated that a bulk heterojunction Gd0.3Ca2.7Co3.82Cu0.18O9-δ (GCCCO)-BaCe0.6Zr0.2Y0.2O3-δ (BCZY) layer with a domain width of ~5 nm can be grown by pulsed laser deposition (PLD) via spontaneous phase separation. Such a nanocomposite interlayer between spin-coated BCZY electrolyte and brush-painted GCCCO cathode can effectively increases the interfacial area between the two distinct phases and facilitates proton transport across the interface. This electrode design reduces the ohmic resistance by 0.35 Ω cm2 and the polarization resistance by a factor of three, thus significantly boosting the cell performance. © 2023, The Authors. All rights reserved.

关键词： Pulsed laser deposition

来源：评论

学校读者我要写书评

暂无评论

First measurement of the strange axial coupling constant using neutral-current quasielastic interactions of atmospheric neutrinos at KamLAND

引用

Physical Review D 2023年第7期107卷 072006-072006页

作者： S. Abe S. Asami M. Eizuka S. Futagi A. Gando Y. Gando T. Gima A. Goto T. Hachiya K. Hata K. Ichimura S. Ieki H. Ikeda K. Inoue K. Ishidoshiro Y. Kamei N. Kawada Y. Kishimoto M. Koga M. Kurasawa T. Mitsui H. Miyake T. Nakahata K. Nakamura R. Nakamura H. Ozaki T. Sakai I. Shimizu J. Shirai K. Shiraishi A. Suzuki Y. Suzuki A. Takeuchi K. Tamae H. Watanabe Y. Yoshida S. Obara A. K. Ichikawa S. Yoshida S. Umehara K. Fushimi K. Kotera Y. Urano B. E. Berger B. K. Fujikawa J. G. Learned J. Maricic S. N. Axani Z. Fu J. Smolsky L. A. Winslow Y. Efremenko H. J. Karwowski D. M. Markoff W. Tornow J. A. Detwiler S. Enomoto M. P. Decowski C. Grant A. Li H. Song S. Dell’Oro T. O’Donnell Research Center for Neutrino Science Tohoku University Sendai 980-8578 Japan Department of Human Science Obihiro University of Agriculture and Veterinary Medicine Obihiro 080-8555 Japan Kavli Institute for the Physics and Mathematics of the Universe (WPI) The University of Tokyo Institutes for Advanced Study The University of Tokyo Kashiwa Chiba 277-8583 Japan Graduate Program on Physics for the Universe Tohoku University Sendai 980-8578 Japan Frontier Research Institute for Interdisciplinary Sciences Tohoku University Sendai 980-8578 Japan Department of Physics Tohoku University Sendai 980-8578 Japan Graduate School of Science Osaka University Toyonaka Osaka 560-0043 Japan Research Center for Nuclear Physics Osaka University Ibaraki Osaka 567-0047 Japan Department of Physics Tokushima University Tokushima 770-8506 Japan Graduate School of Integrated Arts and Sciences Tokushima University Tokushima 770-8502 Japan Nuclear Science Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics and Astronomy University of Hawaii at Manoa Honolulu Hawaii 96822 USA University of Delaware Newark Delaware 19716 USA Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Department of Physics and Astronomy University of Tennessee Knoxville Tennessee 37996 USA Triangle Universities Nuclear Laboratory Durham North Carolina 27708 USA Physics Departments at Duke University Durham North Carolina 27708 USA North Carolina Central University Durham North Carolina 27707 USA and The University of North Carolina at Chapel Hill Chapel Hill North Carolina 27599 USA Center for Experimental Nuclear Physics and Astrophysics University of Washington Seattle Washington 98195 USA Nikhef and the University of Amsterdam Science Park Amsterdam The Netherlands Boston University Boston Massachusetts 02215 USA Center for Neutrino Physics Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 US

We report a measurement of the strange axial coupling constant gAs using atmospheric neutrino data at KamLAND. This constant is a component of the axial form factor of the neutral-current quasielastic (NCQE) interaction. The value of gAs significantly changes the ratio of proton and neutron NCQE cross sections. KamLAND is suitable for measuring NCQE interactions as it can detect nucleon recoils with low-energy thresholds and measure neutron multiplicity with high efficiency. KamLAND data, including the information on neutron multiplicity associated with the NCQE interactions, makes it possible to measure gAs with a suppressed dependence on the axial mass MA, which has not yet been determined. For a comprehensive prediction of the neutron emission associated with neutrino interactions, we establish a simulation of particle emission via nuclear deexcitation of C12, a process not considered in existing neutrino Monte Carlo event generators. Energy spectrum fitting for each neutron multiplicity gives gAs=−0.14−0.26+0.25, which is the most stringent limit obtained using NCQE interactions without MA constraints. The two-body current contribution considered in this analysis relies on a theoretically effective model and electron scattering experiments and requires future verification by direct measurements and future model improvement.

关键词： Neutrinos

来源：评论

学校读者我要写书评

暂无评论

Effects of Coulomb and isospin symmetry breaking interactions on neutron-skin thickness

引用

Physical Review C 2023年第6期107卷 064302-064302页

作者： Tomoya Naito (内藤智也) Gianluca Colò Haozhao Liang (梁豪兆) Xavier Roca-Maza Hiroyuki Sagawa (佐川弘幸) RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS) Wako 351-0198 Japan Department of Physics Graduate School of Science The University of Tokyo Tokyo 113-0033 Japan Yukawa Institute for Theoretical Physics Kyoto University Kyoto 606-8502 Japan Dipartimento di Fisica Università degli Studi di Milano Via Celoria 16 20133 Milano Italy INFN Sezione di Milano Via Celoria 16 20133 Milano Italy Center for Mathematics and Physics University of Aizu Aizu-Wakamatsu 965-8560 Japan RIKEN Nishina Center Wako 351-0198 Japan

Both the Coulomb interaction and isospin symmetry breaking (ISB) parts of the nuclear interaction break the isospin symmetry in atomic nuclei. Effects of these two kinds of interaction on properties of atomic nuclei, especially the mass difference of mirror nuclei and the neutron-skin thickness of N=Z and N≠Z nuclei, are discussed. It is found that corrections to the Hartree-Fock-Slater approximation for the Coulomb interaction negligibly affect the neutron-skin thickness, while the charge-symmetry breaking term originating from the strong interaction might affect it non-negligibly. According to our calculations, the ISB terms other than the Coulomb interaction affect the estimation of the density dependence of the symmetry energy, L, by about 0–12MeV using the correlation with the neutron-skin thickness.

关键词： Equations of state of nuclear matter Nuclear forces Nuclear structure & decays Discrete symmetries Nuclear density functional theory

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：