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Nucleon Spin Structure Functions in the Resonance Region and the Duality

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Communications in Theoretical Physics 2003年第6期39卷 675-680页

作者： DongYu-bing FENGQing-guo InstituteofHighEnergyPhysics TheChineseAcademyofSciencesBeijing100039China

We discuss the nucleon spin structure function g1 and the difference between the proton and neutron targets , based on quark model calculation. Quark-hadron duality for the nucleon spin structure function is also analyzed. Effects of the Δ(1232) and Roper P11(1440) resonances on the spin structure function and on the difference are mentioned. The results of different models for the Roper resonance are also addressed.

关键词： constituent quark model quark-hadron duality nucleon spin structure function Roper resonance

Computational fluid dynamics simulation of aerosol transport and deposition

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Frontiers of Environmental Science & Engineering 2011年第3期5卷 362-377页

作者： Yingjie TANG bing guo Department of Mechanical Engineering Texas A&M UniversityCollege StationTX 77843USA

In this article computational fluid dynamics(CFD)simulation of aerosol transport and deposition,*** transport and deposition of particles in an aerosol,is *** review gives a brief account of the basics of aerosol mechanics,followed by a description of the general CFD approach for flow field simulation,turbulence modeling,wall treatments and simulation of particle motion and *** examples from the literature are presented,including CFD simulation of particle deposition in human respiratory tract and particle deposition in aerosol *** simulation of particle transport and deposition may provide information that is difficult to obtain through physical experiments,and it may help reduce the number of experiments needed for device *** to the difficulty of describing turbulent flow and particle-eddy interaction,turbulent dispersion of particles remains one of the greatest challenges for CFD ***,it is possible to take a balanced approach toward quantitative description of aerosol dispersion using CFD simulation in conjunction with empirical relations.

关键词： computational fluid dynamics(CFD) aerosol transport deposition

A new trend in nuclear physics development

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Science China(Physics,Mechanics & Astronomy) 2017年第10期60卷 83-84页

作者： bing guo NaiYan Wang Department of Nuclear Physics China Institute of Atomic Energy Beijing 102413 China

Atomic nuclei comprise a principal level of material *** physics,in itself an substantial area of study,serves as a link between atomic physics and particle *** main research areas of nuclear physics involve strong in... 详细信息

关键词：物理学发展电磁相互作用粒子物理学原子物理学强相互作用弱相互作用材料结构核物理

Connection Between Continuous Optimization and Turán Densities of Non-uniform Hypergraphs

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Acta Mathematicae Applicatae Sinica 2021年第4期37卷 858-866页

作者： Xiao-bing guo Yue-jian PENG School of Mathematics Hunan UniversityChangsha410082China

A classical result of Motzkin and Straus established the connection between the Lagrangian of a graph and its maximum *** it,they gave a new proof of Turán’s *** aroused the interests in studying the connection between continuous optimization and extremal problems in *** 2009,*** Bulòand *** extended the result of Motzkin-Straus to r-uniform ***,Johnston and Lu initiated the study of the Turán density of a non-uniform *** optimization problems related to several types of non-uniform hypergraphs and its applications on Turán densities have also been *** this paper,we obtain a Motzkin-Straus type of results for all non-uniform *** it,we give an upper bound of the Turán density of a complete non-uniform hypergraph.

关键词： hypergrapli maximum clique polynomial optimization

For Mega-Constellations: Edge Computing and Safety Management Based on Blockchain Technology

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China Communications 2024年第2期21卷 59-73页

作者： Zhen Zhang bing guo Chengjie Li College of Computer Science Sichuan UniversityChengdu 610064China The Key Laboratory for Computer Systems of State Ethnic Affairs Commission School of Computer Science and TechnologySouthwest Minzu UniversityChengdu 610225China National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of ChinaChengdu 611731China

In mega-constellation Communication Systems, efficient routing algorithms and data transmission technologies are employed to ensure fast and reliable data transfer. However, the limited computational resources of satellites necessitate the use of edge computing to enhance secure *** edge computing reduces the burden on cloud computing, it introduces security and reliability challenges in open satellite communication channels. To address these challenges, we propose a blockchain architecture specifically designed for edge computing in mega-constellation communication systems. This architecture narrows down the consensus scope of the blockchain to meet the requirements of edge computing while ensuring comprehensive log storage across the network. Additionally, we introduce a reputation management mechanism for nodes within the blockchain, evaluating their trustworthiness, workload, and efficiency. Nodes with higher reputation scores are selected to participate in tasks and are appropriately incentivized. Simulation results demonstrate that our approach achieves a task result reliability of 95% while improving computational speed.

关键词： blockchain consensus mechanism edge computing mega-constellation reputation management

Pion Cloud Effects on △-N Mass Splitting from Quark Models

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Communications in Theoretical Physics 2002年第8期38卷 189-194页

作者： DONG Yu-bing FENG Qing-guo Institute of High Energy Physics the Chinese Academy of Sciences P.O. Box 918-4 Beijing 100039 China Institute of High Energy Physics the Chinese Academy of Sciences P.O. Box 918-4 Beijing 100039 China

Pion cloud effects on △-N mass splitting are studied based on quark models. Pseudo-scalar pion-quarkcoupling is discussed in the relativistic and nonrelativistic frameworks. We separately calculate the pion cloud effects bythe one-pion exchange potential and by another method which is consistent with the baryon chiral perturbation *** able discrepancy in the mass splitting between the two methods is shown.

关键词： quark models, coupling constants, pion cloud, △-N mass splitting

Nucleon Spin Content in a Relativistic Quark Potential Model Approach

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Communications in Theoretical Physics 2002年第6期37卷 693-698页

作者： DONGYu－bing FENGQing－guo InstituteofHighEnergyPhysics theChineseacademyofSciencesBeijing100039China

Based on a relativistic quark model approach with an effective potential , the spin content of the nucleon is investigated. Pseudo-scalar interaction between quarks and Goldstone bosons is employed to calculate the couplings between the Goldstone bosons and the nucleon. Different approaches to deal with the center of mass correction in the relativistic quark potential model approach are discussed.

关键词： relativistic quark model approach Goldstone bosons spin content

Micro/nano Indentation and Single Grit Diamond Grinding Mechanism on Ultra Pure Fused Silica

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Chinese Journal of Mechanical Engineering 2011年第6期24卷 963-970页

作者： ZHAO Qingliang guo bing STEPHENSIN David CORBETT John School of Mechatronics Engineering Harbin Institute of Technology Harbin 150001 China Materials Department Cranfield University Cranfield Bedford MK43 OAL UK School of Applied Sciences Cranfield University Cranfield Bedford MK43 OAL UK

The existing research about ductile grinding of fused silica glass was mainly focused on how to carry out ductile regime material removal for generating very ＂smoothed＂ surface and investigate the machining-induced damage in the grinding in order to reduce or eliminate the subsurface *** brittle/ductile transition behavior of optical glass materials and the wear of diamond wheel are the most important factors for ductile grinding of optical *** this paper,the critical brittle/ductile depth,the influence factors on brittle/ductile transition behavior,the wear of diamond grits in diamond grinding of ultra pure fused silica（UPFS） are investigated by means of micro/nano indentation technique,as well as single grit diamond grinding on an ultra-stiff machine tool,Tetraform ＂C＂.The single grit grinding processes are in-process monitored using acoustic emission（AE） and force dynamometer *** wear of diamond grits,morphology and subsurface integrity of the machined groves are examined with atomic force microscope（AFM） and scanning electron microscope（SEM）.The critical brittle/ductile depth of more than 0.5 μm is *** compared to the using roof-like grits,by using pyramidal diamonds leads to higher critical depths of scratch with identical grinding ***,the influence of grit shapes on the critical depth is not significant as *** grinding force increased linearly with depth of cut in the ductile removal regime,but in brittle removal regime,there are large fluctuations instead of forces *** SEM photographs of the cross-section profile show that the median cracks dominate the crack patterns beneath the single ***,The SEM photographs show multi worn patterns of diamond grits,indicating an inhomogeneous wear mechanism of diamond grits in grinding of fused silica with diamond grinding *** proposed research provides the basal technical theory for improving the ultra-precision grinding of UPFS.

关键词： ultra pure fused silica (UPFS) micro/nano indentation single grit diamond grinding ductile material removal subsurface integrity diamond grits wear

r-Matrix Structure for a Restricted Flow with Bargmann Constraint

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Communications in Theoretical Physics 2005年第3X期44卷 393-395页

作者： CHEN Jin-bing GENG Xian-guo Department of Mathematics Zhengzhou University Zhengzhou 450052 China

This paper deals with the integrability of a finite-dimensional Hamiltonian system linked with the generalized coupled KdV hierarchy. For this purpose the associated Lax representation is presented after an elementary calculation. It is shown that the Lax representation enjoys a dynamical r-matrix formula instead of a classical one in the Poisson bracket on R2N. Consequently the resulting system is proved to be completely integrable in view of its r-matrix structure.

关键词： Poisson bracket Lax representation r-matrix Liouville integrability