检索结果-南通市图书馆

Carbon nanostructures produced through ion irradiation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

nuclear Science and Techniques 2003年第2期14卷 107-114页

作者： YU Li-Ping, WANG Zhen-Xia, ZHU Zhi-Yuan, ZHANG Hu-Yong, HAN Jia-Guang, ZHANG Wei, SUN Li-Tao,WANG Ting-Tai, MA Yu-Gang (shanghai institute of nuclear research, the Chinese Academy of Sciences,{4.) shanghai institute of nuclear research the Chinese Academy of Sciences 上海 201800

Several nanostructures we produced by ion irradiation have been reviewed in this paper. By using ions to irradiate two ultrahigh molecular weight polyethylene targets respectively, it was found that small fullerenes C20 and C26 were grown, adding two members to the fullerene family. Meanwhile, crystalline diamonds also have been produced by Ar+ ions irradiation of graphite. In the experiment of double ions Ni+ and Ar+ irradiation, nanoscale argon bubbles formed. On the other side, when multi-wall carbon nanotubes were irradiated by C+, many MWCNTs evolved to amorphous carbon nanowires and amorphous carbon nanotubes. And there are possible welding in the crossed nanotubes.

关键词：碳纳米结构离子辐射聚乙烯

The in vitro reconstitution of nucleosome and its binding patterns with HMG1/2 and HMG14.17 proteins

在线全文

学校读者我要写书评

暂无评论

Cell research 2003年第5期13卷 351-359页

作者： SHU BING ZHANG, JIAN HUANG, HUI ZHAO, YI ZHANG, CHUN HuI HOU, XIAO DONG CHENG, CHU JIANG, MIN QIAN LI, JUN HU, RUO LAN QIAN 1 Group of Globin Gene Expression and Regulation, State Key Laboratory of Molecular Biology, institute of Biochemistry and Cell Biology, shanghai institutes for Biological Sciences, Chinese Academy of Sciences, shanghai 200031,{4.. 2 shanghai institute of nuclear research, Chinese Academy of Sciences, shanghai 201800,{4. Group of Globin Gene Expression and Regulation State Key Laboratory of Molecular Biology Institute of Biochemistry and Cell Biology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200031 China

Using atomic force microscopy (AFM), the dynamic process of the in vitro nucleosome reconstitution followed by slow dilution from high salt to low salt was visualized. Data showed that the histone octamers were dissociated from DNA at 1M NaCl. When the salt concentration was slowly reduced to 650 mM and 300 mM, the core histones bound to the naked DNA gradually. Once the salt concentration was reduced to 50 mM the classic 'beads-on-astring' structure was clearly visualized. Furthermore, using the technique of the in vitro reconstitution of nucleosome, the mono- and di- nucleosomes were assembled in vitro with both HS2core (-10681 to -10970 bp) and NCR2 (-372 to -194.bp) DNA sequences in the 5’flanking sequence of human b-globin gene. Data revealed that HMG 1/2 and HMG 14.17 proteins binding to both DNA sequences are changeable following the assembly and disassembly of nucleosomes. We suggest that the changeable binding patterns of HMG 14.17 and HMG1/2 proteins with these regulatory elements may be criti

关键词： atomic force microscopy HMG proteins (HMG1/2 and HMG14.17) human β-globin gene in vitro reconstitution nucleosome.

Intermediate energy light sources and the SSRF project

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

nuclear Science and Techniques 2003年第1期14卷 1-8页

作者： ZHAO Zhen-Tang(shanghai institute of nuclear research, the Chinese Academy of Sciences,{4.) shanghai institute of nuclear research the Chinese Academy of Sciences Shanghai 201800

Advances in insertion device technology, top-up operation and superconducting RF cavities make it possible to generate high brightness X-ray with intermediate energy light sources, which leads a new trend in designing and constructing third generation light sources around the world. The development status and the remarkable technical features of intermediate energy light sources are reviewed, and the main SSRF properties are described in this paper.

关键词：软X射线光源 SSRF 核技术上海同步辐射装置应用电子应用光束稳定性化学结构结构分析

Studies of low-lying states of even-even Xe isotopes within the nucleon pair approximation

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2011年第S1期54卷 103-108页

作者： ZHANG LiHua1, JIANG Hui1,2 & ZHAO YuMin1,3,4.1institute of nuclear, Particle, Astrophysics and Cosmology, Department of Physics, shanghai Jiao Tong University, shanghai 20024.,{4. 2School of Arts and Sciences, shanghai Maritime University, shanghai 200135,{4. 3Center of Theoretical nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000,{4. 4.CAST, World Laboratory, P.O. Box 8730, Beijing 100080,{4. 1. institute of nuclear Particle Astrophysics and Cosmology Department of Physics Shanghai Jiao Tong University Shanghai 200240 China2. School of Arts and Sciences Shanghai Maritime University Shanghai 200135 China3. Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator Lanzhou 730000 China4. CCAST World Laboratory P.O. Box 8730 Beijing 100080 China

We study the relevance of nucleon pairs with higher spins, in addition to spin-zero and spin-two pairs (i.e., S D pairs), in low-lying states of even-even Xe nuclei. By including those higher-spin pairs in our configuration, we recalculate energy level schemes, elec trical quadrupole moments, magnetic moments and electric quadrupole transition rates, for low-lying states of even-even 128-14.Xe nuclei. The agreement between our calculated results and the experimental data is substantially improved in comparison with previous studies.

关键词： nucleon pair approximation shell model configuration space low-lying states

THE MODULI SPACE OF COMPLEX LAGRANGIAN SUBMANIFOLDS IN THE HYPER-KAEHLER MANIFOLD

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 1999年第4期20卷 393-400页

作者： FU JIXIANG(institute of Mathematics, Fudan University, shanghai 2004.3, china) Fudan Univ Inst Math Shanghai 200433 Peoples R China

The deformation of a compact complex Lagrangian submanifold in a hyper-Kaehler manifold and the moduli space are studied. It is proved that the moduli space Mc1 is a special Kaehler manifold, where special means that there is a real flat torsionfree symplectic connection satisfying dI = 0 (I is a complex structure of Mcl). Thus, following [4., one knows thatT*Mcl is a hyper-Kaehler manifold and then that Mcl is a complex Lagrangian submanifold in T* Mcl.

关键词： Moduli space Complex Lagrangian submanifold Hyper-Kaehler manifold Special Lagrangian submanifold Special Kaehler manifold Deformation

THREE NEW Fe-BASED MICROCRYSTALLINE ALLOYS WITH SUPERIOR MAGNETIC PROPERTIES

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1992年第12期5卷 502-511页

作者： ZHANG Yanzhong NIAN Suzhen shanghai Iron and Steel research institute shanghai Iron and Steel research Inst Shanghai China

Three new Fe-based microcrystalline alloys,i.e.,Fe_(73.1)Cu_(1.2)Nb_(3.2)Si_(12 5)B_(10), Fe_(73)Cu_1Nb_(1.5)Mo_2Si_(12.5)B_(10) and Fe_(73)Cu_1Zr_3C_(0.5)Mo_Si_(12.5)B_(10),were developed with su- perior magnetic properties.e.g.,high relative initial permeability of μ_i^15×10~4.low coercivity of H_c1.0A/m,high effective permeability and low core losses in a consid- crable wide frequency range and high pulse-magnetic permeability under narrow pulse. The optimum value of relative effective permeability,μ_5~1 is 16×10~4.under condition of f=1 kHz and H_m=0.4.A/*** optimum values of core loss reach 57.9 30.2 and 68 W/kg under condition of f=50.100.100 KHz and B_m=0.5,0.2,0.3 T,respectively. These three alloys have superior stability of magnetic *** permeability may be not changed during heating at 130℃ up to 216 *** main crystalline phase is ordered phase Fe_((75)+y)Si_((25)-y) which is ultrafine particles of average size 10—20 nm.

关键词： microcrystalline alloy relative initial permeability effective permeability coercivity core loss ultrafine particle

Dynamic Analysis of a Single-Column Platform (II)

在线全文

学校读者我要写书评

暂无评论

china Ocean Engineering 1992年第4期7卷 395-402页

作者： Lian Gan, Ni Kan, Hu Kai Guo Dawei 2. Professor, Senior Engineer, Marine Design & research institute of china, shanghai3. Senior Engineer, Marine Design & research institute of china, shanghai4. Engineer, Marine Design & research institute of china, shanghai

This paper describes the study of a single-column structure used as well-head platform. In order to check the reliability of computation theory and programme, model tests have been carried out. The paper introduces th... 详细信息

关键词： single-column structure dynamic analysis diffraction wave theory natural period damping ratio

Optical Recording Performance of Azo Nickel Chelate Thin Film

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 1999年第5期8卷 444-448页

作者： YIN Jinlong WANG Shuangqing GAN Fuxi(shanghai institute of Optics and Fine Mechanics, The Chinese Academy of Sciences,shanghai 201800,{4.institute of Photographic Chemistry, The Chinese Academy of Sciences,Beijing 100101,{4.) 中科院上海光学精密机械所上海 201800 中科院感光化学所北京 100101 中科院上海光学精密机械所上海

The absorption, transmission and reflection spectra of spin-coated films of Ni(azo)2(azo nickel chelate) were measured. Because of the intermolecular aggregation, the absorption peak of Ni(azo)2 thin film has a red-shift of about 4. nm with respect to that of it in methanol solution. The fabricated optica disk showed a reflectivity of 4.% and its carrier-noise ratio (CNR) was greater than 4. dB when recording with 7. 5 mW laser power at the wavelength of 780nm.

关键词： azo dye optical recording absorption spectra

Comparison of energy structure and spectral properties of Ce:LaAlO_3 and Ce:Lu_2(SiO_4.O

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(Technological Sciences) 2009年第12期52卷 3678-3682页

作者： WANG XiaoDan 1 ,PAN Tao 1 ,ZANG TaoCheng 1 ,LI JianKang 1 ,ZHAO ZhiWei 2 ,ZHANG LianHan 2 &XU Jun3 1Department of Applied Physics,University of Science and Technology of Suzhou,Suzhou 215009,china 2shanghai institute of Optics and Fine Mechanics,Chinese Academy of Sciences,shanghai {4.,china 3shanghai institute of Ceramics,Chinese Academy of Sciences,shanghai {4.,china 1. Department of Applied Physics University of Science and Technology of Suzhou Suzhou 215009 China 2. shanghai institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China 3. shanghai institute of Ceramics Chinese Academy of Sciences Shanghai 201800 China

Undoped LaAlO3 and 1 at.%Ce:LaAlO3 single crystals were grown by the Czochralski *** and fluorescence spectra were measured at room *** energy levels structure of Ce:LaAlO3 was *** this paper,two viewpoints were *** first one is:the energy levels structure of Ce:LaAlO3 is very similar to that of Ce:Lu2(SiO4.O which is a well-known *** the energy levels structure of Ce:LaAlO3 and Ce:Lu2(SiO4.O,the lowest 5d energy level of Ce 3+ is located below the bottom of the conduction band of host crystal and the other higher 5d energy levels of Ce 3+ are located above the bottom of the conduction band of host *** second one is:Ce:LaAlO3 single crystal may not be suitable for scintillation application;by comparing the energy levels structures of Ce:LaAlO3 and Ce:Lu2(SiO4.O,the large energy difference(1.13 eV)between the two lowest 5d energy levels of Ce 3+ in LaAlO3 is a crucial factor that causes the luminescence quenching.

关键词： Ce:LaAlO3 Ce:Lu2(SiO4.O energy-level absorption luminescence