检索结果-南通市图书馆

Intersection theory rules symbology

在线全文

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2024年第2期67卷 93-104页

作者： Jiaqi Chen Bo Feng Lilin Yang Beijing Computational Science Research Center Beijing 100084China zhejiang institute of modern physics School of PhysicsZhejiang UniversityHangzhou 310027China Peng Huanwu Center for Fundamental Theory Hefei 230026China

We propose a novel method to determine the structure of symbols for any family of polylogarithmic Feynman *** the d log-bases and simple formulas for the leading order and next-to-leading contributions to the intersection numbers,we give a streamlined procedure to compute the entries in the coefficient matrices of canonical differential equations,including the symbol letters and the rational *** also provide a selection rule to decide whether a given matrix element must be *** symbol letters are deeply related to the poles of the integrands and also have interesting connections to the geometry of Newton *** method can be applied to many cutting-edge multi-loop *** simplicity of our results also hints at the possible underlying structure in perturbative quantum field theories.

关键词： scattering amplitude Feynman integral symbology

Local quantum Fisher information and quantum correlation in the mixed-spin Heisenberg XXZ chain

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2024年第2期19卷 235-245页

作者： Peng-Fei Wei Qi Luo Huang-Qiu-Chen Wang Shao-Jie Xiong Bo Liu Zhe Sun school of physics Hangzhou Normal UniversityHangzhou 310036China zhejiang institute of modern physics and school of physics Zhejiang UniversityHangzhou 310027China school of Information and Electrical Engineering Hangzhou City UniversityHangzhou 310015China zhejiang Provincial Key Laboratory of Urban Wetlands and Regional Change Hangzhou 311121China

We study the local quantum Fisher information(LQFI)in the mixed-spin Heisenberg XXZ *** the maximal and minimal LQFI are studied and the former is essential to determine the accuracy of the quantum parameter estimation,the latter can be well used to characterize the discord-type quantum *** investigate the effects of the temperature and the anisotropy parameter on the maximal LQFI and thus on the accuracy of the parameter *** we make use of the minimal LQFI to study the discord-type correlations of different site *** dimensions of the subsystems cause different values of the minimal LQFI which reflects the asymmetry of the discord-type *** addition,the site pairs at different positions of the spin chains have different minimal LQFI,which reveals the influence of the surrounding spins on the bipartite quantum *** results show that the LQFI obtained through a simple calculation process provides a convenient way to investigate the discord-type correlation in high-dimensional systems.

关键词： local quantum Fisher information quantum correlation mixed-spin Heisenberg XXZ chain

Effect of cognitive training on brain dynamics

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese physics B 2024年第2期33卷 529-536页

作者：吕贵阳徐天勇陈飞燕朱萍王淼何国光 school of physics Zhejiang UniversityHangzhou 310027China

The human brain is highly *** training is usually used to modify functional connectivity of brain ***,the structures of brain networks may determine its dynamic behavior which is related to human cognitive *** study the effect of functional connectivity on the brain dynamics,the dynamic model based on functional connections of the brain and the Hindmarsh–Rose model is utilized in this *** resting-state fMRI data from the experimental group undergoing abacus-based mental calculation(AMC)training and from the control group are used to construct the functional brain *** dynamic behavior of brain at the resting and task states for the AMC group and the control group are simulated with the above-mentioned dynamic *** the resting state,there are the differences of brain activation between the AMC group and the control group,and more brain regions are inspired in the AMC group.A stimulus with sinusoidal signals to brain networks is introduced to simulate the brain dynamics in the task *** dynamic characteristics are extracted by the excitation rates,the response intensities and the state *** change in the functional connectivity of brain networks with the AMC training would in turn improve the brain response to external stimulus,and make the brain more efficient in processing tasks.

关键词： brian dynamics functional brain networks cognitive training abacus-based mental calculation

Unbound^(28)O,the heaviest oxygen isotope observed:a cutting-edge probe for testing nuclear models

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2024年第2期35卷 1-2页

作者： Jian-Guo Li Bai-Shan Hu Shuang Zhang Fu-Rong Xu school of physics and State Key Laboratory of Nuclear Physics and TechnologyPeking UniversityBeijing 100871China institute of modern physics Chinese Academy of SciencesLanzhou 730000China Southern Center for Nuclear-Science Theory(SCNT) Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China

The beyond-dripline oxygen isotopes^(27,28)O were recently observed at RIKEN,and were found to be unbound decaying into^(24)O by emitting *** unbound feature of the heaviest oxygen isotope,^(28)O,provides an excellent test for stateof-the-art nuclear *** atomic nucleus is a self-organized quantum manybody system comprising specific numbers of protons Z and neutrons N.

关键词： testing quantum system

Electron capture and excitation in intermediate-energy He2+–H(1s,2s)collisions

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2024年第8期33卷 72-79页

作者：刘亚东贾聪聪马茗萱高翔刘玲吴勇陈向军王建国 Department of modern physics University of Science and Technology of ChinaHefei 230026China institute of Applied physics and Computational Mathematitics Beijing 100088China institute of modern physics Key Laboratory of Nuclear Physics and Ion-Beam Application(MOE)Fudan UniversityShanghai 200433China

The semiclassical non-perturbative atomic orbital close-coupling approach has been employed to study the electron capture and excitation processes in He2+–H(1s)and He2+–H(2s)collision *** order to ensure the accuracy of our calculated cross sections,a large number of high excited states and pseudostates are included in the expansion basis sets which are centered on the target and projectile,*** total and partial charge transfer and excitation cross sections are obtained for a wide-energy domain ranging from 1 keV/amu to 200 keV/*** present calculations are also compared with the results from other theoretical *** cross section data are useful for the investigation of astrophysics and laboratory plasma.

关键词： atomic orbital close-coupling(AOCC)method inelastic collision processes electron capture and excitation

Stable stripe and vortex solitons in two-dimensional spin-orbit coupled Bose-Einstein condensates

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical physics 2024年第6期76卷 26-33页

作者： Yuan Guo Muhammad Idrees Ji Lin Hui-jun Li institute of Nonlinear physics and Department of physics Zhejiang Normal UniversityJinhua 321004China zhejiang institute of Photoelectronics and zhejiang institute for Advanced Light Source Zhejiang Normal UniversityJinhua 321004China

We present a flexible manipulation and control of solitons via Bose-Einstein *** the presence of Rashba spin-orbit coupling and repulsive interactions within a harmonic potential,our investigation reveals the numerical local solutions within the *** manipulating the strength of repulsive interactions and adjusting spin-orbit coupling while maintaining a zero-frequency rotation,diverse soliton structures emerge within the *** include plane-wave solitons,two distinct types of stripe solitons,and odd petal solitons with both single and double *** stability of these solitons is intricately dependent on the varying strength of spin-orbit ***,stripe solitons can maintain a stable existence within regions characterized by enhanced spin-orbit coupling while petal solitons are unable to sustain a stable existence under similar *** rotational frequency is introduced to the system,solitons undergo a transition from stripe solitons to a vortex array characterized by a sustained *** rotational directions of clockwise and counterclockwise are non-equivalent owing to spin-orbit *** a result,the properties of vortex solitons exhibit significant variation and are capable of maintaining a stable existence in the presence of repulsive interactions.

关键词： Bose-Einstein condensate spin-orbit coupling rotation frequency stripe solitons vortex array

Cholesterol-induced deformation of the gramicidin A channel inhibiting potassium ion binding and transport

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese physics B 2024年第5期33卷 696-702页

作者：肖盼曹宇朱瑾梁清 Center for Statistical and Theoretical Condensed Matter physics & Department of physics Zhejiang Normal UniversityJinhua 321004China zhejiang institute of Photoelectronics & zhejiang institute for Advanced Light Source Zhejiang Normal UniversityJinhua 321004China

Gramicidin A(gA)is a kind of antibiotic peptide produced by bacillus brevis and it can dimerize across lipid bilayers to form a monovalent cation *** this work,we investigate the impact of cholesterol in the lipid bilayer on the binding of potassium ions with the gA channel and the transport of the ions across the *** results indicate that cholesterol can significantly influence the conformational stability of the gA channel and cause the channel deformation which inhibits the potassium ion binding with the channel and transport across the *** work provides some molecular insights into understanding of influence of lipids on the activity of gA channel in both model membranes and plasma membranes of intact cells.

关键词： gramicidin A lipid bilayer molecular dynamics interaction

Study of the topological quantities of lattice QCD using a modified DCGAN frame

在线全文

学校读者我要写书评

暂无评论

Chinese physics C 2024年第5期48卷 151-159页

作者：高璘应和平张剑波 school of physics Zhejiang UniversityHangzhou 310027China

A modified deep convolutional generative adversarial network(M-DCGAN)frame is proposed to study the N-dimensional(ND)topological quantities in lattice QCD based on Monte Carlo(MC)*** construct a new scaling structure including fully connected layers to support the generation of high-quality high-dimensional images for the *** results suggest that the M-DCGAN scheme of machine learning will help to more efficiently calculate the 1D distribution of topological charge and the 4D topological charge density compared with MC simulation alone.

关键词： lattice QCD generative adversarial network topological charge density Wilson flow

Diffraction limit of light in curved space

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2024年第2期12卷 235-243页

作者： JINGXUAN ZHANG CHENNI XU PATRICK SEBBAH LI-GANG WANG school of physics Zhejiang UniversityHangzhou 310058China Department of physics The Jack and Pearl Resnick Institute for Advanced TechnologyBar-Ilan UniversityRamat-Gan 5290002Israel

Overcoming the diffraction limit is crucial for obtaining high-resolution images and observing fine *** this conventional difficulty still puzzling us and the prosperous development of wave dynamics of light interacting with gravitational fields in recent years,how spatial curvature affects the diffraction limit is an attractive and important *** we investigate the issue of the diffraction limit and optical resolution on two-dimensional curved space—surfaces of revolution(SORs)with constant or variable spatial *** show that the diffraction limit decreases and the resolution is improved on SORs with positive Gaussian curvature,opening a new avenue to *** diffraction limit is also influenced by the propagation direction,as well as the propagation distance in curved space with variable spatial *** results provide a possible method to control the optical resolution in curved space or equivalent waveguides with varying refractive index distribution and may allow one to detect the presence of the nonuniform strong gravitational effect by probing locally the optical resolution.

关键词： limit curved curvature