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Photon polarization tensor in a magnetized plasma system

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Communications in Theoretical Physics 2020年第11期72卷 57-64页

作者： jingyi chao Mei Huang Institute of Modern Physics Chinese Academy of SciencesLanzhou730000China School of Physics Sciences University of Chinese Academy of SciencesBeijing 100039China

We investigate the photon polarization tensor at finite temperatures in the presence of a static and homogeneous external magnetic *** our scheme,the summing of the Matsubara frequency is performed after Poisson resummation,which is easily completed and converges ***,the behaviors of finite Landau levels are presented *** shows a convergence while summing infinite Landau ***,there is no necessity to truncate the Landau level in a numerical *** zero temperature,the lowest Landau level(LLL)approximation is analytically satisfied for the vacuum photon polarization ***,we examine that the LLL approximation is not enough for the thermal polarization *** thermal tensor obtains non-trivial contributions from the finite-n Landau ***,photon spectra gains a large imaginary contribution in thermal medium,which is the so-called Landau ***,it is argued that the summation of Matsubara frequency is not commuted with Landau level ones,such conjecture is excluded in our calculations.

关键词： magnetic field thermal field theory photon polarization Landau damping

Charged pion condensation in anti-parallel electromagnetic fields and nonzero isospin density

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Chinese Physics C 2020年第3期44卷 101-110页

作者： jingyi chao Mei Huang Andrey Radzhabov Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Matrosov Institute for System Dynamics and Control Theory SB RAS Lermontov str. 134664033IrkutskRussia

The formation of charged pion condensate in anti-parallel electromagnetic fields and in the presence of the isospin chemical potential is studied in the two-flavor Nambu-Jona-Lasinio *** method of Schwinger proper time is extended to explore the quantities in the off-diagonal flavor space,*** charged *** this framework,π^± are treated as bound states of quarks and not as point-like charged *** isospin chemical potential plays the role of a trigger for charged pion *** obtain the associated effective potential as a function of the strength of the electromagnetic fields and find that it contains a sextic term which possibly induces a weak first order phase *** dependence of pion condensation on model parameters is investigated.

关键词： pion condensate electromagnetic fields weakly first order phase transition

Feasibility and Challenges of Interactive AI for Traditional Chinese Medicine: An Example of ChatGPT

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Chinese Medicine and Culture 2024年第2期7卷 174-181页

作者： KONG Qi CHEN Liming YAO jingyi DING chao YIN Peihao Putuo Hospital Shanghai University of Traditional Chinese MedicineShanghai 200062China Interventional Cancer Institute of Chinese Integrative Medicine Shanghai University of Traditional Chinese MedicineShanghai 200062China Yueyang Hospital of Integrated Traditional Chinese and Western Medicine Shanghai University of Traditional Chinese MedicineShanghai 200082China

As a complementary and alternative medicine(CAM),traditional Chinese medicine(TCM)represents an established medical system with a rich history and abundant clinical *** is an empirical medicine,the process of which is analogous to ChatGPT’s learning and development *** TCM,inquiry is a relatively objective way of traditional syndrome *** various artificial intelligence systems related to TCM consultation exist,their interactive abilities remain *** study standardized the primary complaint and instructed ChatGPT to simulate a TCM practitioner,conducting three comprehensive inquiry *** results yielded unexpected conclusions,revealing that ChatGPT could simulate a TCM practitioner’s inquiry with patients,confirming its potential in the field of TCM ***,current applications still pose certain limitations and ***,to integrate ChatGPT-like language models with traditional TCM AI to establish an associative mode that can facilitate TCM diagnosis and treatment with more convenience and standardization is crucial,yet at the same time,it should be treated very carefully.

关键词： Traditional Chinese medicine Artificial intelligence ChatGPT

Light touch in quantum:an interview with *** Haroche

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Advanced Photonics 2024年第1期6卷 10-16页

作者： chao-Yang Lu CAS Centre for Excellence in Quantum Information and Quantum Physics HefeiChina NYU Shanghai NYU-ECNU Institute of PhysicsShanghaiChina University of Science and Technology of China Department of Modern PhysicsShanghaiChina

Lu:Hello,***,nice to see you again!Let us start the *** 2012,you and David Wineland won the Nobel Prize in *** you describe your work in simple terms to a general audience?And can you tell us how you were originally interested in this field and got into this study?Haroche:Maybe I should start with the second part of the question.I got interested in atomic physics when I was a student atÉcole Normale Supérieure(ENS)in Paris in the 1960s.

关键词： quantum interview Serge

Newly Possible Quark Matter State in Heavy Ion Collisions

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IMP & HIRFL Annual Report 2018年第1期 19-20页

作者： chao jingyi 不详

The color superconductivity of Quantum Chromodynamics(QCD)matter at high baryon density,such as in the core of the neutron star,has been extensively studied,see Ref.[1]for a review and references *** studies have shown that consequences of the large superconducting gap will be observed in astrophysics or in laboratory heavy-ion ***,this has not been robustly confirmed by a first principle calculation due to the sign problem of lattice Monte Carlo simulations in dense QCD *** has therefore been proposed that one may understand quark matter at finite baryon density in other,simpler QCD-like *** example,in Nc=2 gauge may theory,the fermion determinant is guaranteed to be real at nonzero chemical potential thanks to an additional anti-unitary symmetry,allowing a discrete evaluation for both fundamental and adjoint ***,the flavor space is extended from the usual SU(Nf)to the larger SU(2N1f).

关键词： quark gauge consequences

On the Proper Holomorphic Mappings between Equidimensional Hartogs Domains over Hermitian Symmetric Manifolds

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Acta Mathematica Sinica,English Series 2024年第5期40卷 1215-1228页

作者： En chao BI School of Mathematics and Statistics Qingdao UniversityQingdao 266071P.R.China

In this paper,we study a family of Hartogs domains fibred over Hermitian symmetric manifolds being a unit ball in C^(m).The aim of the present study is to establish the rigidity results about proper holomorphic mappings between two equidimensional Hartogs domains over Hermitian symmetric *** particular,we can fully determine its biholomorphic equivalence and automorphism group.

关键词： Proper holomorphic mapping Hartogs domains Hermitian symmetric manifolds

Tracked robot with underactuated tension-driven RRP transformable mechanism:ideas and design

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Frontiers of Mechanical Engineering 2024年第1期19卷 85-104页

作者： Ran XU chao LIU School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Key Laboratory of Vehicle Advanced Manufacturing Measuring and Control Technology(Ministry of Education)Beijing Jiaotong UniversityBeijing 100044China

Robots with transformable tracked mechanisms are widely used in complex terrains because of their high adaptability,and many studies on novel locomotion mechanisms have been conducted to make them able to climb higher *** underactuated transformable mechanisms for tracked robots could decrease the number of actuators used while maintaining the flexibility and obstacle-crossing capability of these robots,and increasing their cost ***,the underactuated tracked robots have appreciable research *** this paper,a novel tracked robot with a newly proposed underactuated revolute‒revolute‒prismatic(RRP)transformable mechanism,which is inspired by the sit-up actions of humans,was *** newly proposed tracked robot has only two actuators installed on the track pulleys for moving and does not need extra actuators for ***,it could concentrate the track belt’s tension toward one side,and the unbalanced tension would drive the linkage mechanisms to change its *** this method,the proposed underactuated design could change its external shape to create support points with the terrain and move its center of mass actively at the same time while climbing obstacles or crossing other kinds of terrains,thus greatly improving the climbing capability of the *** geometry and kinematic relationships of the robot and the crossing strategies for three kinds of typical obstacles are *** the basis of such crossing motions,the parameters of links in the robot are designed to make sure the robot has sufficient stability while climbing ***-crossing dynamic simulations were run and analyzed to prove the feasibility of the robot.A prototype was built and *** show that the proposed robot could climb platforms with heights up to 33.3%of the robot’s length or cross gaps with widths up to 43.5%of the robot’s length.

关键词： mechanical design tracked robot underactuated mechanisms RRP mechanism obstacle crossing strategy

Constructing the Impossible Differential of Type-II GFN with Boolean Function and Its Application to WARP

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Chinese Journal of Electronics 2024年第1期33卷 80-89页

作者： Jiali SHI Guoqiang LIU chao LI College of Liberal Arts and Sciences National University of Defense Technology Hunan Engineering Research Center of Commercial Cryptography Theory and Technology Innovation State Key Laboratory of Information Security Institute of Information Engineering

Type-Ⅱ generalized Feist el network(GFN) has attracted a lot of attention for its simplicity and high *** differential attack is one of the powerful cryptanalytic approaches for word-oriented block ciphers such as Feistel-like *** deduce the impossible differential of Type-Ⅱ GFN by analyzing the Boolean function in the middle *** main idea is to investigate the expression with the variable representing the plaintext(ciphertext) difference words for the internal state *** adopting the miss-in-the-middle approach,we can construct the impossible differential of Type-Ⅱ *** an illustration,we apply this approach to WARP,a lightweight 128-bit block cipher with a 128-bit key which was presented by Banik et *** SAC *** structure of WARP is a 32-branch Type-Ⅱ ***,we find two 21-round truncated impossible differentials and implement a 32-round key recovery attack on *** the 32-round key recovery attack on WARP,some observations are used to mount an effective *** the advantage of the early abort technique,the data,time,and memory complexities are 2125.69chosen plaintexts,2126.6832-round encryptions,and 2100-bit,*** the best of our knowledge,this is the best attack on WARP in the single-key scenario.

关键词： Ciphers Boolean functions Parallel processing Complexity theory

Active flutter suppression of nonlinear fin-actuator system via inverse system and immersion and invariance method

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Chinese Journal of Aeronautics 2024年第4期37卷 343-362页

作者： Jin LU Zhigang WU chao YANG Chinese Aeronautical Establishment Beijing 100029China School of Aeronautic Science and Engineering Beihang UniversityBeijing 100191China

Structural nonlinearities such as freeplay will affect the stability and even flight safety of the fin-actuator *** is a lack of a practical method for designing Active Flutter Suppression (AFS) control laws for nonlinear fin-actuator systems.A design method for the AFS controller of the nonlinear all-movable fin-electromechanical actuator system is established by combining the inverse system and the Immersion and Invariance (I&I) ***,the composite control law combining the inverse system principle and internal model control is used to offset the nonlinearity and dynamics of the actuator,so that its driving torque can follow the ideal ***,the ideal torque of the actuator is designed employing the I&I *** unfavorable oscillation of the fin is suppressed by making the output torque of the actuator track the ideal *** simulation results reveal that the proposed AFS method can increase the flutter speed of the nonlinear finactuator system with freeplay,and a set of controller parameters is also applicable for wider freeplay within a certain *** power required for the actuator does not exceed the power that can be provided by the commonly used aviation *** method can also resist a certain level of noise and external disturbance.

关键词： Aeroelasticity Active flutter suppression Fin-actuator system Freeplay Inverse system Immersion and invariance