检索结果-南通市图书馆

PIXE and INAA studies on ancient potteries from Guangfulin relics in shanghai

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2007年第11期17卷 1348-1356页

作者： Lin Jiawei1, Cheng Huansheng1, Zhang Zhengquan1, Zhang Bin1, Feng Songlin2, Song Jian3, Gao Menghe4.and Zhu Dan1(1. Applied Ion Beam physics Laboratory, Key Laboratory of the Ministry of Education, institute of modern physics,{4., shanghai 2.043., china 2. Key Laboratory of Nuclear Analytical Techniques, institute of High Energy physics, Beijing 100039, china 3. shanghai Museum, shanghai 200003, china 4. Department of Cultural Heritage and Museology,{4., shanghai 2.043., china) Applied Ion Beam physics Laboratory Key Laboratory of the Ministry of Education Institute of Modern Physics Fudan University Shanghai 200433 China Key Laboratory of Nuclear Analytical Techniques Institute of High Energy Physics Beijing 100039 China shanghai Museum Shanghai 200003 China Department of Cultural Heritage and Museology Fudan University Shanghai 200433 China

This paper reports the study of ancient potteries unearthed from the Guangfulin site in shanghai. From the external features of these potteries, archeologists can classify them into two different cultural types: Liangzhu culture (local culture) and a new culture which might be derived elsewhere, but they can not recognize whether they were produced in the same place. Proton induced X-ray emission (PIXE) and instrumental neutron activation analysis (INAA) were used to measure the chemical compositions of the samples and the results were analyzed using multivariate statistics. We found that the two methods can complement each other and their database can be mutually referenced in the study of ancient potteries. Experimental results show that the compositions of the potteries from the two cultural types are different, which means that the materials for ancient potteries of new culture originate from elsewhere. This supports the archaeologists’ speculation that a group of ancient people migrated to shanghai from some other places 4.00 years ago.

关键词： PIXE INAA factor analysis Guangfulin ancient pottery

Proton induced X-ray emission (PIXE) analysis of sources of porcelain body of Ru Guan and Jun Guan porcelains

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china(physics,Mechanics & Astronomy) 2006年第4期49卷 411-420页

作者： LI Guoxia1, ZHAO Weijuan1, LI Rongwu2, SUN Hongwei1, GUO Min1, WANG Yanfang1, LIU Hui1, ZHAO Qingyun3, SUN Xinmin3, ZHAO Wenjun3 & CHENG Huansheng4.1. Faculty of Physical Engineering, Zhengzhou university, Zhengzhou 4.0052, china 2. Department of physics, Beijing Normal university, Beijing 100875, china 3. institute of Cultural Relic and Archaeology of Henan Province, Zhengzhou 4.0000, china 4. institute of modern physics, fudan university, shanghai 2.043., china Faculty of Physical Engineering Zhengzhou University Zhengzhou 450052 China Department of physics Beijing Normal University Beijing 100875 China institute of Cultural Relic Archaeology of Henan Province Zhengzhou 450000 China institute of modern physics Fudan University Shanghai 200433 China

34.samples of Ru Guan porcelain body and 50 samples of Jun Guan porcelain body (both kinds being in different body colors) were selected with the purpose of finding out the source of raw materials and their classification relationship so as to search for ways of non-destructive discrimination. Proton induced X-ray emission (PIXE) has been applied to these samples to determine their chemical elements. The data of seven major chemical elements collected from these samples were further studied through fuzzy cluster analysis. Results indicate that the origin of raw materials of Jun Guan porcelain body samples is comparatively more concentrated in certain places, while that of Ru Guan porcelain body samples is scattered about. The places of origin of raw materials of the majority of Ru Guan and Jun Guan porcelain body samples have something in common, but some differences still exist. It might be an important way for non-destructive discrimination among Ru Guan and Jun Guan porcelains by combining PIXE with fuzzy cluster analysis.

关键词： Ru Guan and Jun Guan porcelain, source of porcelain body, PIXE, fuzzy cluster analysis, non-destructive discrimination.

β-delayed proton decays near the proton drip line

在线全文

学校读者我要写书评

暂无评论

Science china(physics,Mechanics & Astronomy) 2005年第3期48卷 257-267页

作者： XU Shuwei 1 , LI Zhankui 1 , XIE Yuanxiang 1 , HUANG Wenxue 1 , SHU Nengchuan 2 , CHEN Yongshou 2 , XU Furong 3 , WANG Kun 4., PAN Qiangyan 1 , WANG Xudong 1 , YU Yong 1 & XING Yebing 1 1. institute of modern physics, Chinese Academy of Sciences, Lanzhou 730000, china 2. Nuclear physics Department, china institute of Atomic Energy, Beijing 1024.3, china 3. Department of Technical physics, Peking university, Beijing 100871, china 4. shanghai institute for Nuclear Research, shanghai 201800, china 1. institute of modern physics Chinese Academy of Sciences 730000 Lanzhou China 2. Nuclear physics Department China Institute of Atomic Energy 102413 Beijing China 3. Department of Technical physics Peking University 100871 Beijing China 4. shanghai institute for Nuclear Research 201800 Shanghai China

We briefly reviewed the experimental study on a-delayed proton decays near the proton drip line published by our group during the period of 1996―2004. namely the first observation of the a-delayed proton decays of 9 new nuclides in the rare-earth region and the new measurements of a-delayed proton decays of 5 nuclides in the mass ～90 region near the N = Z line with the aid of the “p-?” coincidence in combination with a He-jet tape transport system. In the meantime some important experimental technique details were supplemented. The experimental results, including the half -lives, spins, parities, deformations and production reaction cross sections for the 14.nuclei were summarized and compared with the current nuclear-model predictions, and then the following points were represented. (1) The experimental half-lives for 85Mo and 92Rh as well as the predicted “waiting point” nuclei 89Ru and 93Pd are 5―10 times longer than the theoretical predictions given by M?ller et al. using a macroscopic-microscopic model. It considerably influences the predictions of the abundances of the nuclides produced in the rp-process. (2) The current-model predictions are not consistent with the experimental assignments of the spins and parities for the proton drip-line nuclei 14.Ho and 128Pm. However, the nuclear potential energy surface (PES) calculated by using a Woods- Saxon-Strutinsky method reproduced the experimental results. (3) The Alice code overestimated the production reaction cross sections of the studied 9 rare-earth nuclei by one order of magnitude or two, while HIVAP code overestimated them by one order of magnitude approximately.

关键词： proton drip line, β-delayed proton decay, He-jet tape transport system, "p-γ" coincidence, spin, parity, deformation, production reaction cross section.

TURNING-OVER OF THE ELECTRIC DIPOLE IN A POLYMER

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2001年第6期19卷 573-578页

作者： Guang-qi Li Xin Sun and Sheng Li State Key Laboratory of Surface physics and Research Center for Theoretical physics, fudan university shanghai 2.043.,{4. National Laboratory of Infrared physics, shanghai institute of Technical physics,shanghai 200083,{4. fudan Univ State Key Lab Surface Phys Shanghai 200433 Peoples R China fudan Univ Res Ctr Theoret Phys Shanghai 200433 Peoples R China Acad Sinica Shanghai Inst Tech Phys Natl Lab Infrared Phys Shanghai 200083 Peoples R China

The transition from the biexciton to the exciton can turn over the direction of the electric dipole of a polymericmolecule. This turning-over action combined with the photoinduced polarization reversion can be used as a switch. Theswitching speed is governed by the relaxation time of the turning-over process, which can be determined by a dynamicalsimulation.

关键词： exciton biexciton electric dipole switch relaxation

Ab-initio molecular dynamics simulation on nano-system under external pressure

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2004年第z1期47卷 92-100页

作者： Jl Min, SUN Deyan & GONG XingaoSurface physics Laboratory and Department of physics, fudan university, shanghai 2.043.,{4. institute of Solid State physics, Chinese Academy of Sciences, Hefei 230031,{4. Interdisciplary Center for Theoretical studies, Chinese Academy of Sciences, Beijing 100080,{4. fudan Univ Surface Phys Lab Shanghai 200433 Peoples R China fudan Univ Dept Phys Shanghai 200433 Peoples R China Chinese Acad Sci Inst Solid State Phys Hefei 230031 Peoples R China Chinese Acad Sci Interdisciplinary Ctr Theoret Studies Beijing 100080 Peoples R China

A new constant-pressure molecular dynamics (MD) method is developed to simulate the dynamic behavior and structure transition of finite system under external pressure. In this method, no artificial parameter is introduced and the computation overheads are very small. As an application, a hard-soft transition of single wall carbon nanotube (SWCNT) under external pressure is found, which is in agreement with the experiments.

关键词： phase transition, simulation, nano-particles

I-V and C-V properties of TiO_2 thin film by pulsed-laser reactive deposition

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1998年第16期43卷 1344-1349页

作者： FU Zhengwen 1, ZHOU Mingfei 1, ZHANG Shengkun 2,CHEN Lianyao 2 and QIN Qizong 1 1. Laser Chemistry institute, fudan university, shanghai 2.043., china 2. Department of {4., fudan university, shanghai 2.043., china Laser Chemistry institute Fudan University Shanghai China Department of Pnysics Fudan University Shanghai China

TiO-2 thin films have bee deposited on p-Si(111) substrates by pulsed-laser ablation of metallic Ti target in the O-3 ambient. The current-voltage and capacitance-voltage of the Al/TiO-2/Si capacitors are measured. The results show that the dielectric constant of thin film after being annealed at 700℃ is found to be 4., and the border trap density and the interface state density at the TiO-2/p-Si interface are 1.8×10 12 cm -2 and 2×10 12 eV -1·cm -2, respectively. The conduction mechanisms of as-deposited films are also discussed.

关键词： TiO-2 dielectric properties electrical properties pulsed-laser deposition.

Hydrogenation of CO over carbides of tungsten

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 1992年第1期10卷 5-9页

作者： QIN,Dai-Yi GAO,Zi Department of Chemistry,fudan university,shanghai 2.043. QIU,Yue-Ming DONG,Shu-Zhong Department of {4. physics,fudan university,shanghai 2.043. 1Department of Chemistry Fudan University Shanghai 2004332Department of Modern Physics Fudan University Shanghai 200433

CO hydrogenation on tungsten carbides has been *** methanation activities of tungsten carbides are comparable to that of supported Group VIII metal ***- programmed thermal desorption spectra of CO on tungsten carbide ... 详细信息

关键词： Hydrogenation of CO over carbides of tungsten CO over

Jackknife and Bootstrap Tests of the Composition Vector Trees

在线全文

学校读者我要写书评

暂无评论

Genomics, Proteomics & Bioinformatics 2010年第4期8卷 262-267页

作者： Guanghong Zuo1,2, Zhao Xu1,3, Hongjie Yu1,4. and Bailin Hao1,5,6 1T-Life Research Center & Department of physics, fudan university, shanghai 2.043., china 2{4. institute of Applied physics, Chinese Acadamy of Sciences, {4. 201800, china 3Applied Biosystems, Inc., Beijing 100027, china 4.10}-VARI Center for Genetic Epidemiology, fudan university, shanghai 2.043., china 5institute of Theoretical physics, Chinese Acadamy of Sciences, Beijing 100190, china 6Santa Fe institute, Santa Fe, NM 87505, USA. [a] T-Life Research Center & Department of physics fudan university shanghai 2.043. china [b] shanghai institute of Applied physics Chinese Acadamy of Sciences shanghai 201800 china [c] Applied Biosystems Inc. Beijing 100027 china [d] fudan-VARI Center for Genetic Epidemiology fudan university shanghai 2.043. china [e] institute of Theoretical physics Chinese Acadamy of Sciences Beijing 100190 china [f] Santa Fe institute Santa Fe NM 87505 USA

Composition vector trees （CVTrees） are inferred from whole-genome data by an alignment-free and parameter-free method. The agreement of these trees with the corresponding taxonomy provides an objective justification of the inferred phylogeny. In this work, we show the stability and self-consistency of CVTrees by performing bootstrap and jackknife re-sampling tests adapted to this alignment-free approach. Our ultimate goal is to advocate the viewpoint that time-consuming statistical re-sampling tests can be avoided at all in using this alignment-free approach. Agreement with taxonomy should be taken as a major criterion to estimate prokaryotic phylogenetic trees.

关键词： composition vector phylogeny topological distance bootstrap jackknife CVTree

Riemann boundary value problems and reflection of shock for the Chaplygin gas

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2012年第4期55卷 671-685页

作者： CHEN ShuXing 1,& QU AiFang 2 1 School of Mathematical Sciences,fudan university,shanghai 2.043.,{4. 2 Wuhan institute of physics and Mathematics,Chinese Academy of Sciences,Wuhan 4.0071,{4. 1. School of Mathematical Sciences Fudan University Shanghai 200433 China2. Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 China

In this paper,we study two-dimensional Riemann boundary value problems of Euler system for the isentropic and irrotational Chaplygin gas with initial data being two constant states given in two sectors respectively,where one sector is a quadrant and the other one has an acute vertex *** prove that the Riemann boundary value problem admits a global self-similar solution,if either the initial states are close,or the smaller sector is also near a *** result can be applied to solving the problem of shock reflection by a ramp.

关键词： Riemann boundary value problem reflection of shock Chaplygin gas wave interaction Eulersystem