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Mapping Between Charge-Dyon and Position-Dependent Mass Systems

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Communications in Theoretical Physics 2019年第10期71卷 1261-1266页

作者： Anderson L.de Jesus Alexandre G.M.Schmidt Departamento de fisica de Volta Redonda Instituto de Ciencias Exatas—Universidade Federal Fluminense

The primary purpose of this work is to reproduce the scenario composed of a charge-dyon system utilizing position-dependent effective mass(PDM) background in the non-relativistic and in the relativistic regimes. In the nonrelativistic case we substitute the exact charge-dyon eigenfunction into PDM Schr?dinger equation, in the Zhu-Kroemer parametrization, and then solve it for the mass distribution considering M = M(r). Analogously, in the relativistic case we study the Klein-Gordon equation for a position-dependent mass, and in this case, we are able to analytically solve the equation for M = M(r, θ).

关键词： position-dependent mass Schrodinger equation Klein-Gordon equation dyon

Is Brenner＇s Modification to the Classical Navier-Stokes Equations Able to Describe Sound Propagation in Gases？

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Chinese Physics Letters 2008年第4期25卷 1355-1358页

作者： W. Marques Jr. Departamento de fisica Universidade Federal do Parana Calxa Postal 19044 81531-990 Curitiba Brazil

We analyse the problem concerning the propagation of sound waves in gases by using the modified hydrodynamic theory proposed recently by Brenner for single-component fluids. The modifications introduced by Brenner are based on his proposal that the translational momentum in fluid motion is not given by the mass flux. Comparison of the sound propagation results derived from Brenner＇s theory with available experimental data for monatomic gases shows that this modified continuum theory is unable to describe the acoustic measurements not even in the low-frequency limit, a result that from our point of view makes Brenner＇s proposal questionable.

关键词： Modification Classical Navier-Stokes Equations Able

A data-driven approach to π^0,η and η＇ single and double Dalitz decays

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Chinese Physics C 2018年第2期42卷 89-105页

作者： Rafel Escribano Sergi Gonzàlez-Solís Crup de fisica Tebrica Departament de Fisica Universitat Autbnoma de Barcelona E-08193 Bellaterra (Barcelona) Spain Institut de fisica d'Altes Energies (IFAE) The Barcelona Institute of Science and Technology (BIST) Campus UAB E-08193 Bellaterra (Barcelona) Spain CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing 100190 China

The dilepton invariant mass spectra and integrated branching ratios of the single and double Dalitz decays P→l^＋l^-γ and P→l^＋l^-l^＋l^-（P=π^0,η,η＇;l=e or μ） are predicted by means of a data-driven approach based on the use of rational approximants applied to π^0,η and η＇ transition form factor experimental data in the space-like region.

关键词： electromagnetic processes and properties phenomenological models transition form factor

Effects of Λ hyperons on the deformations of even–even nuclei

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Chinese Physics C 2022年第6期46卷 212-218页

作者：陈超锋陈启博周先荣程奕源崔继伟 H.-J.Schulze Department of Physics East China Normal UniversityShanghai 200241China School of Physics and Optoelectronic Engineering Xidian UniversityXi'an 710071China INFN Sezione di Catania Dipartimento di FisicaUniversitádi CataniaVia Santa Sofia 6495123 CataniaItaly

The deformations of multi-Λ hypernuclei corresponding to even-even core nuclei ranging from^(8)Be to^(40)Ca with 2,4,6,and 8 hyperons are studied using the deformed Skyrme-Hartree-Fock *** is found that the deformations are reduced when adding 2 or 8 Λ hyperons,but enhanced when adding 4 or 6 Λ *** differences are attributed to the fact that Λ hyperons are filled gradually into the three deformed p orbits,of which the [110] 1/2^(-)orbit is prolately deformed and the degenerate [101]1/2^(-)and [101]3/2^(-)orbits are oblately deformed.

关键词： deformation even-even nuclei effects of hyperon(s)

Anterior Knee Pain and Patellar Instability 2

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Nuclear liquid-gas phase transition within a Brueckner-Hartree-Fock approach

2011年

作者： Vicente Sanchis-Alfonso

来源：畅想之星图书光盘版（南... 评论

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Chinese Physics C 2022年第11期46卷 231-237页

作者：张晶刘宏铭李增花 G.F.Burgio H.-J.Schulze Institute of Modern Physics Key Laboratory of Nuclear Physics and Ion-beam Application(MOE)Fudan UniversityShanghai 200433China INFN Sezione di Catania Dipartimento di Fisica e AstronomiaUniversitàdi CataniaVia S.Sofia 64I-95123 CataniaItaly

The critical parameters of the liquid-gas phase transition of symmetric nuclear matter are computed using the Brueckner-Hartree-Fock method at finite temperature by employing different realistic nucleon-nucleon *** effects on single-particle potentials,defect functions,and three-body forces are discussed in *** obtained from the full procedure and frozen-correlations approximation are *** find critical temperatures of approximately 14 to 19 MeV and critical densities in the range of 0.05 to 0.08fm^(-3),depending on the interactions employed.

关键词： nuclear liquid-gas phase transition Brueckner-Hartree-Fock approach symmetric nuclear matter

Nonlinear optical characterization of single β-barium-borate nanocrystals using second-harmonic confocal microscopy

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Chinese Optics Letters 2018年第4期16卷 81-85页

作者： Rodrigo G.dos Santos Lauro J.Q.Maia Cid B.de Araújo Leonardo de S.Menezes Departamento de fisica Universidade Federal de PernambucoRecife-PE 50670-901Brazil Instituto de fisica Universidade Federal de CoiasCoiania-CO 74001-970Brazil

The confocal microscopy technique was applied for nonlinear optical characterization of single β-barium-borate（β-BBO） nanocrystals. The experimental setup allows measurements of the laser polarization-selective secondharmonic（SH） generation, and the results can be used to determine the nanocrystals＇ c-axis orientation, as well as to obtain information about their second-order susceptibility χ^（2）. The dependence of the SH signal on the laser polarization allowed the discrimination of individual particles from aggregates. The data were fitted using a model that takes into account the BBO properties and the experimental setup characteristics considering（i） the electrostatic approximation,（ii） the effects of the microscope objective used to focus the light on the sample in an epi-geometry configuration, and（iii） the symmetry of χ^（2） for the β-BBO nanocrystals. A signal at the third-harmonic frequency was also detected, but it was too weak to be studied in detail.

关键词： SH BBO HR barium-borate nanocrystals using second-harmonic confocal microscopy Nonlinear optical characterization of single

General Relativity and the Tully-Fisher Relation for Rotating Galaxies

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Journal of Modern Physics 2022年第11期13卷 1452-1473页

作者： Yogendra Srivastava Giorgio Immirzi John Swain Orlando Panella Simone Pacetti Emeritus Professor of Physics Northeastern University Boston MA USA Dipartimento di fisica e Geologia Università di Perugia Perugia Italy Retired Dipartimento di Fisica e Geologia Università di Perugia Perugia Italy Physics Department Northeastern University Boston MA USA Istituto Nazionale di fisica Nucleare INFN Sezione di Perugia Perugia Italy

The flat limit of rotational velocity (vφ) approximately equal to the “edge”-velocity of a galaxy is related to the baryonic mass (MB) via the T-F relationship with n ≈ 4. We explore the connection between mass and the limiting velocity in the framework of general relativity (GR) using the Weyl metric for axially-symmetric galaxies that are supported entirely by their rotational motion. While for small distances from the center, the Newtonian description is accurate as one moves beyond the (baryonic) edge of the galaxy, Lenz’s law and non-linearity of the gravitational field inherent in GR not only lead to a flat velocity (obviating its Keplerian fall), but also provide its tight log-log relationship with the enclosed (baryonic) mass.

关键词： GR Weyl Metric Rotating Galaxies Flat Rotation Curves TF Relation

Thermal management for the underwater frontend and readout electronics of JUNO 20‑inch PMTs

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Radiation Detection Technology and Methods 2023年第3期7卷 418-426页

作者： Yangfu Wang Xiaoshan Jiang Jun Hu Peiliang Wang Lei Fan Shaojing Hou Zhe Ning Yunhua Sun Xiongbo Yan Zheng Wang Ziyue Yan Peiran Ye Jie Zhang Alberto Garfagnini Antonio Bergnoli Riccardo Brugnera Beatrice Jelmini Filippo Marini Marco Grassi Mariia Redchuk Andrea Serafini Katharina von Sturm Institute of High Energy Physics BeijingChina University of China Academy of Sciences Beijing 100049China INFN Sezione di Padova PaduaItaly Dipartimento di fisica e Astronomia Universita di PadovaPaduaItaly

Background The Jiangmen underground neutrino observatory(JUNO)is a new generation of long-term operation neutrino experimental platform under construction in Jiangmen,Guangdong province of southern *** underwater frontend and readout electronics(F&R electronics)are placed nearby the 20-inch PMTs and readout current signals from three *** electronics are sealed in a stainless-steel underwater box to keep them dry,and temperature control of the electronics plays a significant role in their *** A conductive cooling structure based on the passive cooling method is designed for the 20-inch PMT F&R *** numerical simulation and experimental tests were performed to evaluate the cooling structures'thermal *** The results show that the case temperature of the respective chip for 20-inch PMT F&R electronics is less than 30℃in ambient still *** The case temperature of the respective chip meets the strict temperature requirement for the F&R *** JUNO collaboration has adopted this cooling structure for the 20-inch PMT readout electronics.

关键词： Thermal management JUNO PMT Electronics