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季风与大气环流系统

科学通报 2009年第7期54卷 533-534页

作者： André Berger institut d'Astronomie et de Géophysique G Lemaǐtre Université Catholique de Louvain Chemin du Cyclotron 2 1348 Louvain-la-Neuve Belgium

人类有气象仪器记录的历史太短,不足以捕捉气候系统全部的变率,更难以用来预测未来数十年到数百年的气候变化.重建过去气候变化的历史、理解其机制和过程可以在很大程度上弥补上述不足.在气候系统中,由于季风的演化与变率对人类经济、... 详细信息

人类有气象仪器记录的历史太短,不足以捕捉气候系统全部的变率,更难以用来预测未来数十年到数百年的气候变化.重建过去气候变化的历史、理解其机制和过程可以在很大程度上弥补上述不足.在气候系统中,由于季风的演化与变率对人类经济、文化和生活节奏的许多方面均有重要影响,其研究工作对社会的重要性也日益增加．亚洲季风受欧亚大陆和印度洋．太平洋之间海陆热力差异及青藏高原的强烈影响，是气候系统非常重要的一个组成部分．

关键词：亚洲季风环流系统大气气候系统海陆热力差异气候变化气象仪器生活节奏

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

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Science China(Physics,Mechanics & Astronomy) 2011年第S2期54卷 249-254页

作者： ADELMANN Andreas Paul Scherrer institut Villigen CH-5234 Switzerland

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 extraction. This model is then implemented in OPAL-CYCL, which is a 3D object-oriented parallel code for large scale particle simulations in cyclotrons. In addition, to meet the running requirement of parallel computation, we have constructed a small scale HPC cluster system and tested its performance. Finally, 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

Variations on a Proof of a Borderline Bourgain-Brezis Sobolev Embedding Theorem

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Chinese Annals of Mathematics,Series B 2017年第1期38卷 235-252页

作者： Sagun CHANILLO Jean VAN SCHAFTINGEN Po-Lam YUNG Department of Mathematics Rutgers the State University of New Jersey 110 Frelinghuysen Road PiscatawayNJ08854USA institut de Recherche en Mathematique et en Physique Universite catholique de Louvain Chemin du Cyclotron 2 bte L7.01.011348 Louvain-la-NeuveBelgium Department of Mathematics the Chinese University of Hong KongShatin.Hong Kong

This paper offers a variant of a proof of a borderline Bourgain-Brezis Sobolev embedding theorem on R^n. The authors use this idea to extend the result to real hyperbolic spaces H^n.

关键词： Bourgain-Brezis inequalities Divergence-free vector fields Sobolev inequalities Real hyperbolic space

Carbon isotopic compositions of pore and matrix carbonates in carbonate nodules, and origin of carbonate formation

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Chinese Science Bulletin 2010年第26期55卷 2926-2929页

作者： LIU Lian YIN QiuZhen WU HaiBin GUO ZhengTang Key Laboratory of Cenozoic Geology and Environment Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China institut d'Astronomie et de Geophysique G. Lemaitre Universite catholique de Louvain Chemin du Cyclotron 2 1348 Louvain-la-Neuve Bel gium

Carbon isotopes of pedogenic carbonate are often used to study paleoenvironments, but the existence of detrital carbonate changes the carbon isotopic composition. To develop an experimental method to determine existence of detrital carbonate in carbonate nodules, and to avoid it during isotope analysis, 23 pedogenic carbonate nodules in Miocene loess from the Loess Plateau of China were studied through micromorphology and carbon isotope analysis. The difference in carbon isotopic composition between matrix carbonate (B) and pore carbonate (A) (δ 13C(B-A)) ranges from 0.27‰ to 0.44‰ in nodules containing detrital carbonate and -0.16‰ to 0.13‰ in nodules where detrital carbonate is absent. The latter is within measurement error, but the former is beyond it. Here we propose an isotopic approach to determine if nodules contain detrital carbonate: if δ 13C(B-A) is within the measurement error, the nodules do not contain detrital carbonate, and vice versa. We suggest that it is better to analyze pore carbonate instead of matrix carbonate when using carbon isotope of carbonate nodules to reconstruct paleoenvironments.

关键词：碳同位素组成碳酸盐结核核基质中国黄土高原碳同位素分析起源测量误差同位素方法

RHIC束流能量扫描实验中正反粒子椭圆流的平均场势效应(英文)

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原子核物理评论 2015年第2期32卷 146-153页

作者：徐骏柯治明李锋 SONG Taesoo 刘鹤中国科学院上海应用物理研究所上海201800 cyclotron institutE AND DEPARTMENT OF PHYSICS AND ASTRONOMY TEXAS A&M UNIVERSITYCOLLEGE STATION FRANKFURT institut FOR ADVANCED STUDIES THEORETICAL PHYSICS JOHANN WOLFGANG GOETHE UNIVERSITAT 中国科学院大学北京100049

最近,STAR合作体在相对论重离子对撞机的束流能量扫描实验中观测到了正反粒子的椭圆流劈裂。基于输运模型,发现丰重子介质中正反粒子平均场势的不同可以解释其椭圆流的劈裂。利用Nambu-Jona-Lasinio模型描述相对论重离子碰撞的部分子相... 详细信息

最近,STAR合作体在相对论重离子对撞机的束流能量扫描实验中观测到了正反粒子的椭圆流劈裂。基于输运模型,发现丰重子介质中正反粒子平均场势的不同可以解释其椭圆流的劈裂。利用Nambu-Jona-Lasinio模型描述相对论重离子碰撞的部分子相,发现实验中正反粒子的相对椭圆流劈裂可以用来约束该模型中夸克矢量相互作用的耦合系数。这一发现对确定QCD相图的临界点位置和理解整个QCD的相结构有重要意义。

关键词：束流能量扫描 QCD相图椭圆流

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...

Gap formation around Ω_e/2 and generation of low-band whistler waves by Landau-resonant electrons in the magnetosphere: Predictions from dispersion theory

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 institute of Atomic Energy Department of Engineering Physics Tsinghua University Paul Scherrer institut

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

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Earth and Planetary Physics 2020年第2期4卷 138-150页

作者： Konrad Sauer Klaus Baumgartel Richard Sydora Max-Planck-institute for Solar System Research GöttingenGermany(up to 2005 Leibnitz-institut für Astrophysik(AIP) PotsdamGermany(up to 2008 institute for Geophysical Research University of AlbertaEdmontonCanada

In this paper we show that two significant phenomena of magnetospheric chorus emission can be explained by the participation of beam-like electron structures,created by Landau-resonant interaction with growing oblique whistler *** first concerns the widely observed spectral gap near half the electron cyclotron frequency Ωe;the second is related to the observation of very obliquely propagating lower-band waves that cannot be directly generated by temperature *** the gap,kinetic dispersion theory reveals that interference of the beam-related cyclotron mode ω~Ωe-kVb with the conventional whistler mode leads to mode splitting and the appearance of a ’forbidden’ area in the ω-k *** the beam velocity appears as an essential *** is directly related to the phase velocity of the most unstable whistler wave mode,which is close to VAe/2 for sufficiently hot electrons(VAe is the electron Alfven velocity).To clarify the second point,we show that Landau-resonant beams with Vb Vb

关键词： important role play Landau-resonant electrons modification of the electron distribution function gap formation at half the electron cyclotron frequency

Study effects of El Jadida—Casablanca industrial zone neighbouring areas

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Natural Science 2013年第8期5卷 880-887页

作者： Huberson Douo Bogbe Gogon Hassane Erramli Thierry Sauvage Claire Ramboz UniversitéFelix Houphouet Boigny d’ABIDJAN Cocody UFR SSMT Laboratoire de Physique Nucléaire et RadioprotectionAbi-djand’Ivoire Nuclear Physics and Techniques Laboratory Faculty of Sciences SemlaliaUniversity Cadi AyyadMarrakechMorocco CNRS/CEMHTI Site CyclotronOrléansFrance institut des Sciences de la Terre d’Orléans(ISTO) OrléansFrance

The analytical technique PIXE experiment for measuring light and heavy elements concentration inside different samples of soil and residual water collected in the region of Safi-El Jadida, where an industrial complex resided, was performed. The same method was used to investigate the presence of elements ranging from silicon to lead in different soils samples and seaweed collected upstream from the site of Safi-El Jadida industrial zone, inside lands and downstream of it, in the entrance of the Casablanca region. This study allows us to highlight the influence of activities of this industrial zone on the neighbouring areas the site.

关键词： PIXE Heavy And Light Elements Van De Graaff Accelerator Pollution Phosphate Industry Waste

Dynamically generated resonances

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Chinese Physics C 2009年第12期33卷 1132-1139页

作者： E. Oset A. Ramos S. Sarkar 孙宝玺 M.J.Vicente Vacas P. Gonzalez J. Vijande D. Jido T. Sekihara A. Martinez-Torres K. Khemchandani Departamento de Física Teórica and IFIC Centro Mixto Universidad de Valencia-CSIC Institutos de Investigación de Paterna Aptdo. 22085 46071 Valencia Spain Departament d'Estructura i Constituents de la Matèria and institut de Ciències del Cosmos Universitat de Barcelona 08028 Barcelona Spain Variable Energy cyclotron Centre 1/AF Bidhannagar Kolkata 700064 India institute of Theoretical Physics College of Applied Sciences Beijing University of Technology Departamento de Física Atomica Molecular y Nuclear and IFIC Centro Mixto Universidad de Valencia-CSIC Institutos de Investigación de Paterna Aptdo. 22085 46071 Valencia Spain Yukawa institute for Theoretical Physics Kyoto University Kyoto 606-8502 Japan Department of Physics Kyoto University Kyoto 606-8502 Japan Centro de Física Computacional Departamento de Física Universidade de Coimbra P-3004-516 Coimbra Portugal

In this talk I report on recent work related to the dynamical generation of baryonic resonances, some made up from pseudoscalar meson-baryon, others from vector meson-baryon and a third type from two meson-one baryon systems. We can establish a correspondence with known baryonic resonances, reinforcing conclusions previously drawn and bringing new light on the nature of some baryonic resonances of higher mass.

关键词： dynamically generated resonances chiral dynamics hidden gauge formalism for vector mesoninteraction