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Local connectivity of Julia sets for a family of biquadratic polynomials

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Science china Mathematics 2007年第10期50卷 1477-1492页

作者： Jing L~(1+) Wei-yuan QIU~2 ~1 Department of Basic Education,shanghai Maritime university,shanghai 200000,china ~2 Department of Mathematics,fudan university,shanghai 2.04.3,china 1. Department of Basic Education Shanghai Maritime University Shanghai 200000 China 2. Department of Mathematics Fudan University Shanghai 200433 China

The local connectivity of Julia sets for the family of biquadratic polynomials f_c(z)= (z^2-2c^2)z^2 with a parameter c is *** is proved that for any parameter c,the boundary of the immediately attracting domain of f_... 详细信息

关键词： biquadratic polynomials Julia sets local connectivity

Some New Reductions From a Lax Integrable System

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Acta Mathematicae Applicatae Sinica 2002年第3期18卷 405-410页

作者： En-gui FanInstitute of Mathematics. fudan university, shanghai 2.04.3, china Institute of Mathematics Fudan University Shanghai China

An isospectral problem with four potentials is discussed. The corresponding hierarchy of Lax integrable evolution equations is derived. For the hierarchy, it is shown that there exist other new reductions except those presented by Tu, Meng and Ma. For each reduction case the relevant Hamiltonian structure is established by means of trace identity.

关键词： Lax integrable system reduction Hamiltonian structure trace identity

The non-destructive analysis of ancient jade artifacts unearthed from the Liangzhu sites at Yuhang,Zhejiang

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Science china(Technological sciences) 2010年第12期53卷 3404-3419页

作者： GAN FuXi1,3, CAO JingYan2, CHENG HuanSheng3, Gu DongHong1, RUI GuoYao2, FANG XiangMing2, DONG JunQing1 & ZHAO HongXia1 1Scientific Archeology Center, shanghai Institute of Optics and Fine Mechanics, Chinese Academy of sciences, shanghai 201800, china 2 Research Institute of Cultural Relics and Archeology of Zhejiang, Hangzhou 310014, china 3 fudan university, shanghai 2.04.3, china 1. Scientific Archeology Center Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China3. Fudan University Shanghai 200433 China2. Research Institute of Cultural Relics and Archeology of Zhejiang Hangzhou 310014 China

Samples of the jade artifacts unearthed from the Liangzhu sites at Yuhang (Fanshan,Yaoshan, Huiguanshan and Tangshan) of Zhejiang province were described. The chemical composition, phase and jade structure of a hundred and more intact samples were analyzed by the non-destructive techniques of PIXE, XRD and laser Raman spectroscopy. Results showed that the minerals of the jade artifacts mostly belonged to tremolite and tremolite-actinolite. Relationship of the civilization development in the Neolithic age and the application of tremolite type mineral in jade artifacts was discussed. The contents of rare and trace elements in tremolite jade artfacts and in mineral samples were measured for the first time. The possible mineral sources of these tremolite type jade artifacts were discussed.

关键词： Liangzhu culture non-destructive analysis ancient jade artifacts essence and source

Density-functional theory study of the effect of pressure on the elastic properties of CaB_6

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Chinese Physics B 2013年第7期22卷 420-425页

作者：韩晗 Surface Physics Laboratory (National Key Laboratory) Key Laboratory of Computational Physical Sciencesand Department of PhysicsFudan University

Under high pressure, the long believed single-phase material CaB6 was latterly discovered to have a new phase tI56. Based on the density-functional theory, the pressure effects on the structural and elastic properties of CaB6 are obtained. The calculated bulk, shear, and Young’s moduli of the recently synthesized high pressure phase tI56-CaB6 are larger than those of the low pressure phase. Moreover, the high pressure phase of CaB6 has ductile behaviors, and its ductility increases with the increase of pressure. On the contrary, the calculated results indicate that the low pressure phase of CaB6 is brittle. The calculated Debye temperature indicates that the thermal conductivity of CaB6 is not very good. Furthermore, based on the Christoffel equation, the slowness surface of the acoustic waves is obtained.

关键词： density-functional theory elastic properties pressure effects acoustic properties

The maximal rates and minimal decoding delay of more general complex orthogonal designs

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Science china(Information sciences) 2010年第9期53卷 1826-1832页

作者： LI Yuan,KAN HaiBin*,YUAN Chen & MA HuanFei The shanghai Key Lab of Intelligent Information Processing,school of Computer Science,fudan university,shanghai 2.04.3,china 1. The shanghai Key Lab of Intelligent Information Processing School of Computer Science Fudan University Shanghai 200433 China

Space-time block codes based on complex orthogonal design have been widely investigated for their remarkable *** this paper,we propose a definition of more general complex orthogonal designs,which permits arbitrary complex factor with unit modulus in each *** prove that the maximal rate is still (m+1)/2m for n = 2m or 2m-1 antennas and minimal delay is also lower-bounded by(2m/(m-1)).Thus,allowing complex factor with unit modulus in each entry will not improve the main performance criterion of space-time block codes.

关键词： space-time block codes complex orthogonal design more general complex orthogonal design maximal rates minimal delays

Identification and genetic mapping of four novel genes that regulate leaf development in Arabidopsis

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Cell Research 2000年第4期10卷 325-335页

作者： SUN YUE WEI ZHANG FENG LING LI YING LI GUO TIAN LEI LIU HAI HUANG shanghai Institute of Plant Physiology, Chinese Academy of Science, 300 Fenglin Road, shanghai 200032, china school of life sciences, university of Science and Technology of china. 1shanghai Institute of Plant Physiology Chinese Academy of Science 300 Fenglin Road Shanghai 200032 China 1shanghai Institute of Plant Physiology Chinese Academy of Science 300 Fenglin Road Shanghai 200032 China 1shanghai Institute of Plant Physiology Chinese Academy of Science 300 Fenglin Road Shanghai 200032 China 2school of life sciences University of Science and Technology of China. P.O.Box 4 Hefei Anhui 230027 China 1shanghai Institute of Plant Physiology Chinese Academy of Science 300 Fenglin Road Shanghai 200032 China 3shanghai Research Center of life sciences Chinese Academy of Sciences 320 Yueyang Road Shanghai 200031 China

Molecular and genetic characterizations of mutants have led to a better understanding of many developmental processes in the model system Arabidopsis thaliana. However, the leaf development that is specific to plants has been little studied. With the aim of contributing to the genetic dissection of leaf development, we have performed a large-scare screening for mutants with abnormal leaves. Among a great number of leaf mutants we have generated by T-DNA and transposon tagging and ethylmethae sulfonate (EMS) mutagenesis, four independent mutant lines have been identified and studied genetically. Phenotypes of these mutant lines represent the defects of four novel nuclear genes designated LL1 (LOTUS LEAF 1), LL2 (LOTUS LEAF 2), URO (UPRIGHT ROSETTE), and EIL (ENVIRONT CONDITION INDUCED LESION). The phenotypic analysis indicates that these genes play important roles during leaf development. FOr the further genetic analysis of these genes and the map-based cloning of LL1 and LL2, we have mapped these genes to chromosome regions with an efficient and rapid mapping method.

关键词： Arabidopsis leaf mutant leaf development genetic mappin?

Fusion Protein of Interleukin 4 and Diphtherial Toxin with High Cytotoxicity to Cancer Cells

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Acta Biochimica et Biophysica Sinica 2004年第6期36卷 437-442页

作者： Yu-Jian ZHANG, Xiao-BoHU, Su-Xia LI1, Li-Ping TIAN, Sheng-Li YANG, and Yi GONG* Research Center of Biotechnology, shanghai Institutes for Biological sciences,Chinese Academy of sciences, Graduate school of the Chinese Academy of sciences, shanghai 200233, china State Key Laboratory of Bioreactor Engineering, East china university of Science and Technology, shanghai 200237, china Research Center of Biotechnology Shanghai Institutes for Biological SciencesChinese Academy of Sciences Graduate School of the Chinese Academy of SciencesShanghai 200233 China State Key Laboratory of Bioreactor Engineering East China University of Science and TechnologyShanghai 200237 China

Receptor of human interleukin 4 (hIL4R) has been found to be present on many types of cancer, so it may be a good target for cancer therapy. Here, fusion toxin gene DT4H has been constructed by fusing DNA sequence encoding the first 389 amino acids of diphtherial toxin (DT), which can not bind its own receptor, to human interleukin 4 (hIL4) gene. In order to improve the affinity of fusion toxin for hIL4R, a circularly permuted form of hIL4 (cpIL4) was used. The fusion gene was expressed in Escherichia coli where the fusion toxin DT4H was highly expressed. Purified DT4H was very cytotoxic to cancer cell line U251 cells, and moderate cytotoxic to HepG2 and MCF-7 cells. SGC-7901 cells were insensitive to it. The cytotoxic action of DT4H was specific because it was blocked by excess hIL4. These results suggest that DT4H may be a useful agent in the treatment of certain malignancies.

关键词： fusion toxin diphtherial toxin cancer therapy interleukin 4 IL-4 receptor

The protection effect of β-CD on DNA damage induced by ultrafine TiO_2

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Science china Chemistry 2007年第2期50卷 272-275页

作者： ZHU RongRong,WANG ShiLong,SUN XiaoYu,ZHANG Rui & YAO SiDe school of life Science and Technology,Tongji university,shanghai 200092,china 1. school of life Science and Technology Tongji University Shanghai 200092 China

Under the photocatalysis of 365 nm ultraviolet radiation,ultrafine TiO2 caused the oxidative damage of Teasy plasmid DNA. The damage was determined by gel-electrophoresis. Then,a different dose of β-CD was added to the reaction,and the damage was restrained. The rate of damage restraining reached 97% when the mass of β-CD was 4 times as that of TiO2. Through UV scan and IR spectroscopy,it was found that the Ti-O of ultrafine TiO2 was bound with -OH of β-CD cavum and the -OH on the surface of ultrafine TiO2 disappeared,so the formation of ?OH was controlled. The ultrafine TiO2 has been widely used,but it was determined to be carcinogenic by some research. The protection effect of β-CD to DNA in the molecular level takes a new look on the surface modification of nano particles to decrease the toxic effect.

关键词： β-CD ultrafine TiO2 plasmid DNA oxide damage bond reaction damage restrain

THE UNSTABLE FLOW FROM THE GAP BETWEEN TWO CIRCULAR CYLINDERS

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Journal of Hydrodynamics 1991年第3期3卷 110-115页

作者： Xu You-heng Huang Dong-qun, fudan university, shanghai 2.04.3, P.R.china fudan Univ Shanghai China

The interference of two circular cylinders has been researched for many years. In this study, the research work was concentrated on two cylinders in some special staggered arrangement. The velocity signal was measured with a hot wire anemometer and recorded with a TEAC portable data recorder. The relationship between spectrum and time was established by making 200 spectrum analysis in se- quence. The gap flow is unstable when two cylinders are arranged in L/D=2, T/D=1. Mainly, it can be looked as flow past a single blunt body and the Strouhal number is 0.15, The second peak arises in the power spectrum when the gap flow appears at irregular time interval. Sometimes it may be higher than the first one. The Strouhal num- ber corresponding to the second peak is 0.33. But at most of the time it is lower than the first one and even disap- peared. This is meaningful for exploring the mechanisms of interference induced oscillations in flow past two cylin- ders.

关键词： THE UNSTABLE FLOW FROM THE GAP BETWEEN TWO CIRCULAR CYLINDERS 二止 GAP