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Transition of One Mode-Phase at the Crisis and Onset of Spatiotemporal Chaos

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Chinese phys.cs Letters 2001年第2期18卷 178-180页

作者： HE Kai-Fen ZHANG Hai-Yun Key Laboratory in University for Radiation Beam Technology and Materials Modification Beijing Normal UniversityBeijing 100875 inst.tute of Low energy Nuclear phys.cs Beijing Normal UniversityBeijing 100875 Beijing Radiation Center Beijing 100875

In our previous work[***.80(1998)696]we investigated a crisis-induced transition from temporal chaos to spatiotemporal chaos(STC)due to a collision between the unstable orbit of the carrier saddle steady wave(SSW)and the attractor of its perturbation wave(PW).In this letter,we find that at the crisis one PW mode-phase experiences a state *** variations of PW mode-phases are governed by the linear dispersion as well as two competitive effects arising from the system nonlinearity:(1)interaction between the SSW and the PW(SP);(2)self-nonlinearity of the PW(PP).With the increasing importance of system nonlinearity we find that before the crisis for all PW modes the SP effects dominate and the mode-phases vibrate chaotically;while after the crisis for one PW mode the PP effect surpasses that of SP,in which case the phase transits to a state of combination of chaotic whirling and vibrating,which is different from the case of weak *** the meantime,the PW partial wave is free from the trapping of its carrier,and can be driven or damped chaotically depending on the phase difference relative to the carrier SSW,causing the STC motion after the crisis.

关键词： nonlinearity chaotic chaos

high performance computation on beam dynamics problems in high intensity compact cyclotrons

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High performance computation on beam dynamics problems in hi...

Thermodynamic and Kinetic Study of Crystallization Reaction of Fe/Dy Multilayers Form Amorphous State

第一届中国粒子加速器会议

作者： YANG JianJun ZHANG TianJue LIN YuZheng ADELMANN Andreas WANG Feng AN ShiZhong China inst.tute of Atomic energy Department of Engineering phys.cs Tsinghua University Paul Scherrer inst.tut

This paper presents the research progress in the beam dynamics problems for future high intensity compact cyclotrons by utilizing the state-of-the-art high performance computation technology.A "Start-to-Stop" model,which includes both the interaction of the internal particles of a single bunch and the mutual interaction of neighboring multiple bunches in the radial direction, is established for compact cyclotrons with multi-turn *** model is then implemented in OPAL-CYCL,which is a 3D object-oriented parallel code for large scale particle simulations in *** addition,to meet the running requirement of parallel computation,we have constructed a small scale HPC cluster system and tested its ***,the high intensity beam dynamics problems in the 100 MeV compact cyclotron,which is being constructed at CIAE,are studied using this code and some conclusions are drawn.

关键词： compact cyclotron space charge effects parallel computation beam dynamics cluster system

来源： cnki会议评论

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Journal of Rare Earths 2000年第3期18卷 174-177页

作者：李胜利王佩璇 Univ Sci & Technol Beijing Dept Mat Phys Beijing 100083 Peoples R China Shandong Univ Technol Coll Mat Sci & Engn Jinan 250061 Peoples R China

To give further insight into the behavior of Fe/Dy multilayers in the crystallization from as-deposited amorphous state, free energy diagram of Fe/Dy system was constructed based on Miedema semiempirical theory. It is shown that the crystallization of amorphous films is controlled by both thermodynamic and kinetic conditions. The calculated free energies of crystalline Fe and Dy are significantly lower than those in the amorphous states, which provide thermodynamic driving force for crystallization. During annealing, the kinetic phase evolution of the multilayers is controlled by free energy barrier of nucleation and critical-size of new phase nucleus. Thus it explains the experimental results that Fe crystallites formed first followed by Dy grains, whereas crystalline Fe-Dy intermetallic compounds were not observed during annealing at moderate temperatures.

关键词： rare earths multilayer crystallization thermodynamics kinetics

Intelligent Computational Model for energy Efficiency and AI Automation of Network Devices in 5G Communication Environment

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TSINGHUA SCIENCE AND TECHNOLOGY 2024年第6期29卷 1728-1751页

作者： Bagwari, Ashish Logeshwaran, Jaganathan Raja, M. Devisivasankari, P. Bagwari, Jyotshana Rathi, Vikas Saad, Asma Mohammed Elbashir Uttarakhand Tech Univ Dept Elect & Commun Engn Dehra Dun 248007 India Sri Eshwar Coll Engn Dept Elect & Commun Engn Coimbatore 641202 India CMR inst.Technol Dept Comp Sci & Engn Bengaluru 560037 Karnataka India CMR inst.Technol Dept Informat Sci & Engn Bengaluru 560037 Karnataka India Adv & Innovat Res Lab Dehra Dun 248001 India Grap Era Deemed Univ Dept Elect & Commun Engn Dehra Dun 248007 India Prince Sattam Bin Abdulaziz Univ Coll Sci & Humanities Dept Phys Al Kharj 16273 Saudi Arabia

Currently, the 4G network service has caused massive digital growth in high use. Video calling has become the go-to Internet application for many people, downloading even huge files in minutes. Everyone is looking for and buying only 4G Subscriber Identity Module (SIM)-capable mobiles. In this case, the expectation of 5G has increased in line with 2G, 3G, and 4G, where the G stands for generation, and it does not indicate Internet or Internet speed. 5G includes next-generation features that are more advanced than those available in 4G network services. The main objective of 5G is uninterrupted telecommunication service in hybrid energy storage system. This paper proposes an intelligent networking model to obtain the maximum energy efficiency and Artificial Intelligence (AI) automation of 5G networks. There is currently an issue where the signal cuts out when crossing an area with one tower and traveling to an area with another tower. The problem of "call drop", where the call is disconnected while talking, is not present in 5G. The proposed Intelligent Computational Model (ICM) model obtained 96.31% network speed management, 90.63% battery capacity management, 92.27% network device management, 93.57% energy efficiency, and 88.41% AI automation.

关键词： Microwave integrated circuits Automation 5G mobile communication Computational modeling Poles and towers Microwave devices energy efficiency hybrid energy storage system 4G digital growth 5G downloading Subscriber Identity Module (SIM) generation network energy efficiency Artificial Intelligence (AI) automation

Two-photon absorption effect and the intra-molecular charge transfer of p-substituted stilbene-type pyridinium salts

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Science China Technological Sciences 2001年第6期44卷 631-639页

作者：王筱梅周玉芳王春赵显刘志强蒋民华孙真荣丁良恩 Shandong Univ State Key Lab Crystal Mat Jinan 250100 Peoples R China E China Normal Univ Dept Phys Shanghai 200062 Peoples R China

The relationships between two-photon absorption (TPA) effect and excited state intramolecular charge transfer (ICT) of p-substituted stilbene-type pyridinium salts have been investigated. Two-photon absorption cross section (δTPA) for all the compounds has been determined by open aperture Z-scanning technique, while two-photon pumped (TPP) up-converted lasing efficiencies (η) and optical limiting behavior have been measured by two-channel energy-meter, pumped by a mode locked Nd: YAG ps laser. Streak camera was used to record two-photon induced fluorescence and the fluorescence lifetimes. The experimental and calculated results have shown that the excited state larger in-tra-molecular charge transfer, in the excited state characterized by the charge density difference between the ground state ( S0) and the first excited state ( S1), has contributed to enhancing TPA cross section and may result in better optical limiting effect. And high TPP up-converted lasing efficiency is related to not only the δTP

关键词： two-photon absorption two-photon pumped up-converted lasing optical limiting p-substituted stilbene-type pyridinium salts.

Relativistic Quasiparticle Random Phase Approximation with a Separable Pairing Force

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Chinese phys.cs Letters 2009年第5期26卷 52-55页

作者：田源马中玉 Ring Peter China inst.tute of Atomic energy Beijing 102413 phys.kdepartment Technische Universitat Munchen D-85748 Garching Germany Center of Theoretical Nuclear phys.cs National Laboratory of Heavy Collision Lanzhou 730000

In our previous work [phys. Lett. （to be published）, Chin. phys. Lett. 23 （2006） 3226], we introduced a separable pairing force for relativistic Hartree-Bogoliubov calculations. This force was adjusted to reproduce the pairing properties of the Gogny force in nuclear matter. By using the well known techniques of Talmi and Moshinsky it can be expanded in a series of separable terms and converges quickly after a few terms. It was found that the pairing properties can be depicted on almost the same footing as the original pairing interaction, not only in nuclear matter, but also in finite nuclei. In this study, we construct a relativistic quasiparticle random phase approximation （RQRPA） with this separable pairing interaction and calculate the excitation energies of the first excited 2^＋ states and reduced B（E2; 0^＋ → 2^＋） transition rates for a chain of Sn isotopes in RQRPA. Compared with the results of the full Gogny force, we find that this simple separable pairing interaction can describe the pairing properties of the excited vibrational states as well as the original pairing interaction.

关键词： gamma-ray bursts gamma-rays relativity

MEAM Potential with Angular Dependence for TiAl

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Rare Metals 2001年第1期20卷 13-17页

作者： Xiaodong Ni, Xitao Wang, Guoliang Chen (phys.cs Department, University of Science and Technology Beijing, Beijing 100083, China State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China) Univ Sci & Technol Beijing Dept Phys Beijing 100083 Peoples R China Univ Sci & Technol Beijing State Key Lab Adv Met & Mat Beijing 100083 Peoples R China

The modified embedded atom method (MEAM) is an empirical extension of the embedded atom method (EAM) that includes angular forces. By fitted to the lattice constants, the cohesive energy, the APE (anti-phase boundary) energy, and the vacancy formation energy of TiAl, an accurate MEAM potential is obtained for the TiAl system with L10 structure. The calculation results of the properties of TiAl are in good agreement with experiments and the results of first principle (F.P.) calculations.

关键词： embedded atom method TiAl alloy angular dependence potential intermetallics

Spectral characteristics of laser-plasma inst.bilities with a broadband laser

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Chinese phys.cs B 2024年第8期33卷 362-368页

作者：许国潇康宁雷安乐刘会亚赵耀周申蕾安红海熊俊王瑞荣谢志勇周熙晨方智恒王伟 Key Laboratory of high Power Laser and phys.cs Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Shanghai inst.tute of Laser Plasma China Academy of Engineering PhysicsShanghai 201800China School of Science Shenzhen Campus of Sun Yat-sen UniversityShenzhen 518107China University of Chinese Academy of Sciences Beijing 100049China

Recent experimental progresses regarding broadband laser-plasma inst.bilities(LPIs)show that a 0.6%laser bandwidth can reduce backscatters of the stimulated Brillouin scattering(SBS)and the stimulated Raman scattering(SRS)at normal incidence[***.132035102(2024)].In this paper,we present a further discussion of the spectral distributions of the scatters developed by broadband LPIs,in addition to a brief validation of the effectiveness of bandwidth on LPIs mitigation at oblique *** backscatter has a small redshift in the broadband case contrary to the blueshift with narrowband laser,which may be explained by the self-cross beam energy transfer between the various frequency components within the *** backscatter spectrum presents a peak at a longer wavelength in the broadband case compared to the short one in the narrowband case,which is possibly attributed to the mitigation effect of bandwidth on filaments at underdense *** three-halves harmonic emission(3ω/2)has a one-peak spectral distribution under the broadband condition,which is different from the two-peak distribution under the narrowband condition,and may be related to the spectral mixing of different frequency components within the bandwidth if the main sources of the two are both two-plasmon decays.

关键词： laser-plasma inst.bility laser bandwidth light spectrum

Erratum:Development of a Spin-Exchange Optical Pumping-Based Polarized 3He System at the China Spallation Neutron Source(CSNS)[***.38,092801(2021)]

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Chinese phys.cs Letters 2023年第5期40卷 123-123页

作者：黄楚怡张俊佩叶凡秦泽聪 Syed Mohd Amir Zachary Norris Buck Ahmed Salman Wolfgang Kreuzpaintner 齐欣王天昊童欣 inst.tute of high energy phys.cs Chinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803China University of Chinese Academy of Sciences Beijing 100049China

In our published paper,国an important affiliation(University of Chinese Academy of Sciences,Beijing 100049,China)should be added as the 3rd affiliation for the first author,as given ***[1]Huang C,ZhangJ,Ye F,Qin Z,Ami... 详细信息

关键词： Polarized