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台湾研究 2024年第1期 1-14页

作者： institute of Taiwan Studies, {1. academy of Social sciences 中国社会科学院台湾研究所

2024年1.1.日,台湾地区领导人和立法机构“二合一”选举落下幕。民进党籍候选人赖清德、萧美琴当选台湾地区正副领导人。台湾地区立法机构总额1.3席中,中国国民党获52席,民进党获51.,民众党获8席,无党籍及未经政党推荐者获2席.

关键词：中国国民党民进党立法机构台湾地区民众党推荐者二合一候选人

Studies on BEPC upgrade from pretzel to double-ring

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Science china({1.,Mechanics & Astronomy) 2010年第11期53卷 2084-2089页

作者： ZHANG Chuang institute of {1. energy physics,chinese academy of sciences,Beijing 1.0049,china 1. institute of {1. energy physics Chinese Academy of Sciences Beijing 100049 China

physics opportunity in the charm and τ {1. region calls for higher luminosity of the Beijing Electron-Positron Collider (BEPC).The BEPC has experienced continuous improvement since its completion in ***,as a major upgrading project of the BEPC,aims at enhancing its luminosity of factor 30–1.0,following the principle of "one machine,two purposes" as adopted in BEPC,so that both high {1. physics and synchrotron radiation experiments can be carried out with *** the BEPC to BEPCII,the double-ring scheme with multi-bunch e +-e-collision in the large crossing angle was studied in comparison with the single-ring pretzel *** the dedicated synchrotron radiation operation,artful "bridges" are designed to connect two halves of the outer ring in both the southern and the northern crossing *** paper reviews the studies on the BEPC upgrade from pretzel to double-ring structure of BEPCII.

关键词： collider storage ring high energy physics synchrotron radiation

Recent Beijing Spectroscopy (BES) results

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Science china({1.,Mechanics & Astronomy) 2008年第6期51卷 567-576页

作者： LI WeiGuo institute of {1. energy physics, chinese academy of sciences, Beijing 1.0049, china 1. institute of {1. energy physics Chinese Academy of Sciences Beijing 100049 China

Recent experimental results from Beijing Spectroscopy (BES) are reviewed, including the hadron spectroscopy from J/ψ decays, and a number of new states are found or confirmed, including σ, κ, X(1.35), ωφ threshold enhancement in J/ψ→γωφ, a broad resonance in J/ψ→K + K ? π 0, decay studies of ψ(2S) and χ CJ , as well as the results of ψ(3770) non-D $ \bar D $ decays. The current status of BEPCII/BESIII, the major upgrade of BEPC/BESII, is also reported.

关键词： Beijing Spectroscopy hadron spectroscopy charm physics BEPCII

Strong decays of N~*(1.35) in an extended chiral quark model

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Science china({1.,Mechanics & Astronomy) 2009年第10期52卷 1452-1457页

作者： AN ChunSheng1.2,3 & ZOU BingSong1.2,3 1.institute of {1. energy physics,chinese academy of sciences,Beijing 1.0049,china 2 Theoretical physics Center for Science Facilities,chinese academy of sciences,Beijing 1.0049,china 3 Graduate University of chinese academy of sciences,Beijing 1.0049,china institute of {1. energy physics Chinese Academy of Sciences Beijing 100049 China Theoretical physics Center for Science Facilities Chinese Academy of Sciences Beijing 100049 China Graduate University of chinese academy of sciences Beijing 100049 China

The strong decays of the N*(1.35) resonance are investigated in an extended chiral quark model by including the low-lying $ qqqq\bar q $ components in addition to the qqq component. The results show that these five-quark components in N*(1.35) contribute significantly to the N*(1.35) → Nπ and N*(1.35) → Nη decays. The contributions to the Nη decay come from both the lowest energy and the next-tolowest energy five-quarks components, while the contributions to the Nπ decay come from only the latter one. Taking these contributions into account, the description for the strong decays of N*(1.35) is improved, especially for the puzzling large ratio of the decays to Nη and Nπ.

关键词： N*(1.35) strong decays five-quark components

Compression behavior of Zr_(41.Ti_(1.)Cu_(1..5)Ni_(1.)Be_(22.5) bulk metallic glass up to 24 GPa

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Science china({1.,Mechanics & Astronomy) 2005年第3期48卷 319-324页

作者： LI Gong 1. 2 , ZHAN Zaiji 2 , LIU Jing 3 , YUN Jinku 1., SUN Liling 2 , LIU Riping 1., ZHANG Jun 2 & WANG Wenkui 1. 2 1. Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, china 2. Center for Condensed Matter {1., institute of {1., chinese academy of sciences, Beijing 1.0080, china 3. BSRF, institute of high energy {1., chinese academy of sciences, Beijing 1.0039, china 1. Key Laboratory of Metastable Materials Science and Technology Yanshan University 066004 Qinhuangdao China 2. Center for Condensed Matter physics Institute of Physics Chinese Academy of Sciences 100080 Beijing China 3. BSRF Institute of High Energy Physics Chinese Academy of Sciences 100039 Beijing China

The compression of a Zr41.i1.Cu1..5Ni1.Be22.5 bulk metallic glass (BMG) is investigated at room temperature up to 24 GPa using in-situ high pressure {1. dispersive X-ray diffraction with a synchrotron radiation source. The pressure-induced structural relaxation is exhibited. It is found that below about 8 GPa, the existence of excess free volume contributes to the rapid structural relaxation, which gives rise to the rapid volumetric change, and the structural relaxation results in the structural stiffness under higher pressure.

关键词： bulk metallic glass, high pressure, structural relaxation, synchrotron radiation.

Effects of cosmological constant on motion of UHECR particles

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Science china({1.,Mechanics & Astronomy) 2005年第1期48卷 44-56页

作者： CHEN Shaoxia & CHANG Zhe institute of {1. energy physics, chinese academy of sciences, Beijing 1.0039, china Graduate School of chinese academy of sciences, Beijing 1.0039, china institute of {1. energy physics Chinese Academy of Sciences Beijing 100039 China Graduate School Chinese Academy of Sciences Beijing 100039 China

Recent astronomical observations manifest that about two-thirds of the whole energy in the Universe is contributed by a small positive cosmological constant A (> 0). Then, an asymptotically de Sitter spacetime is premised naturally. However, {1. in the de Sitter spacetime is very different from that in the Minkowski spacetime. As the first step, a covariant formalism of the kinematics in the de Sitter spacetime is presented here. By solving exactly the equations of motion for a field, we obtain the dispersion relation of a free particle. It is noticed that the dispersion relation is dependent on the degree of freedom of angular momentum of the particle. We show the threshold anomaly of the ultra high energy cosmic ray disappears naturally in the framework of the de Sitter kinematics.

关键词： ultrahigh energy cosmic ray, cosmological constant, curved spacetime.

A 1.-bit multichannel ADC for pixel detectors in particle physics and nuclear imaging

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Science china(Technological {1.) 2010年第5期53卷 1208-1214页

作者： WEI Wei1.2,3,WANG Zheng1.3 & ZHAO JingWei1.3 1.institute of {1. energy physics,chinese academy of sciences,Beijing 1.0049,china 2 Graduate University of chinese academy of sciences,Beijing 1.0049,china 3 Key Lab of Nuclear Detection Technology and Nuclear Electronics of chinese academy of sciences,Beijing 1.0049,china 1. institute of {1. energy physics Chinese Academy of Sciences Beijing 100049 China2. Graduate University of Chinese Academy of Sciences Beijing 100049 China3. Key Lab of Nuclear Detection Technology and Nuclear Electronics of Chinese Academy of Sciences Beijing 100049 China

Modern pixel detectors in nuclear and particle physics experiments and also in nuclear imaging,starve for {1.ly integrated application specified integrated circuit(ASIC),whereas in china the study of ASIC still stays far away from practical *** lack of ASIC strictly limits the research and development of domestic {1. energy physics field.A 1.-bit multichannel ADC designed for {1. density readout is introduced as a major candidate for solution.A precise model is discussed and the simulation fully agrees with the model,which indicates a key principle of *** is performed according to the given rule,and novel layout techniques are carried *** results in all aspects are also obtained,showing an excellent real performance,which satisfies the practical requirement.

关键词： application specified integrated circuit high density readout Wilkinson ADC multi-channel ADC

Geochemical characteristics of rare earth elements in Wuhan section of the Yangtze River

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Journal of Environmental sciences 1995年第1期7卷 44-51页

作者： Wang Lijun Zhang Shen Zhang Chaosheng(institute of Geography,{1.,Beijing 1.01.1.china)Li Xiuxia(institute of high energy physics,{1.,Beijing 1.0080,china) Inst of Geog Chinese Academy of Sciences Beijing China China

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关键词： geochemical characteristics rare earth elements Yangtze River

The establishment of crystal position look-up table for positron emission tomography with block detectors

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Science china(Technological {1.) 2009年第8期52卷 2418-2423页

作者： CHAI Pei1.2 & SHAN BaoCi1.1.Key Laboratory of Nuclear Analytical Techniques, institute of {1. energy physics, chinese academy of sciences, Beijing 1.0049, china 2 Graduate University of chinese academy of sciences, Beijing 1.0049, china Key Laboratory of Nuclear Analytical Techniques Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Graduate University of chinese academy of sciences Beijing 100049 China

A method has been developed to establish the crystal position look-up table for positron emission tomography with block detectors. It is based on the principle that the counts in crystal position histogram obey the Gaussian mixture model (GMM). This method has taken full consideration of the characteristics of the GMM and the detector itself. The experimental results have proved that it is simple, reliable, and universal.

关键词： positron emission tomography position look-up table 2-D position histogram

Systematic distortion in cosmic microwave background maps

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Science china({1.,Mechanics & Astronomy) 2009年第5期52卷 804-808页

作者： LIU Hao 1.3 &LI TiPei 1.2 1.ey Laboratory of Particle Astrophysics,{1. of high energy physics,chinese academy of sciences,Beijing 1.0049,china 2Center for Astrophysics,Tsinghua University,Beijing 1.0084,china 3 Graduate University of chinese academy of sciences,Beijing 1.0049,china Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Center for Astrophysics Tsinghua University Beijing 100084 China Graduate University of chinese academy of sciences Beijing 100049 China

To minimize instrumentally the induced systematic errors,cosmic microwave background(CMB)anisotropy experiments measure temperature differences across the sky using pairs of horn antennas, temperature map is recovered from temperature difference obtained in sky survey through a map-making *** inspect and calibrate residual systematic errors in the recovered temperature maps is important as most previous studies of cosmology are based on these *** analyzing pixel-ring coupling and latitude dependence of CMB temperatures,we find notable systematic devia- tion from CMB Gaussianity in released Wilkinson Microwave Anisotropy Probe(WMAP)*** detected deviation cannot be explained by the best-fit LCDM cosmological model at a confidence level above 99%and cannot be ignored for a precision cosmology study.

关键词： cosmology cosmic microwave background methods data analysis