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Use-wear evidence confirms the earliest hafted chipped-stone adzes of Upper Palaeolithic in northern china

chinese Science Bulletin 2010年第3期55卷 268-275页

作者： ZHANG XiaoLing1,2,3, SHEN Chen1,2,4 GAO Xing1,2 CHEN FuYou1,2 & WANG ChunXue1,2,3 1institute of Vertebrate Paleontology and Paleoanthropology, chinese academy of sciences, beijing 100044, china 2Laboratory of Human Evolution and Archaeometry, chinese academy of sciences, beijing 100044, china 3graduate university of chinese academy of sciences, beijing 100049, china 4The Royal Ontario Museum, Toronto M5S 2C6, Canada institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences Beijing 100044 China Laboratory of Human Evolution and Archaeometry Chinese Academy of Sciences Beijing 100044 China graduate university of chinese academy of sciences Beijing 100049 China Royal Ontario Museum Toronto M5S 2C6 Canada

Chipped-stone "adze-shaped objects" (ASOs) were identified from a few Upper Palaeolithic sites in northern china. Its morpho- logical form resembles to ground-stone type-specific adze, but the function of the ASO has never been assessed. The objective of this study is to investigate the use function of this particular tool type recovered from the Hutouliang site in the Nihewan Basin of northern china. In this study, the lithic use-wear analysis is applied to examining microscopically edge-damages and sur- face-rounding of the tools in order to assess how they were employed. The result suggests that the ASO might have been used as woodworking tools with a hafted shaft, providing evidence for the appearance of the earliest hafted chipped-stone adzes prior to 10000 years ago in northern china. This study also demonstrates that the use-wear technique is an innovated and effective analytic appraoch to the study of stone tool functions that has been conventionally treated by typo-technological analyses. Stone tool use-patterns revealed by use-wear evidence would shed new insights on prehistoric adaptive strategies of modern human in northern china.

关键词：旧石器时代晚期中国北方磨损证据石材加工工具木工工具中国网站技术分析

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Surface effects of monolayer-protected gold nanoparticles on the redox reactions between ferricyanide and thiosulfate

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Science china chemistry 2005年第5期48卷 424-430页

作者： LI Di1, SUN Chunyan1, HUANG Yunjie1, LI Jinghong1,2 & CHEN Shaowei3 1. State Key Laboratory of Electroanalytical chemistry, changchun institute of applied chemistry, chinese academy of sciences, changchun 130022, china 2. Department of chemistry, Tsinghua university, beijing 100084, china 3. Department of chemistry, university of California, Santa Cruz, Santa Cruz, CA 95064, USA State Key Laboratory of Electroanalytical chemistry changchun institute of applied chemistry Chinese Academy of Sciences Changchun China Department of chemistry Tsinghua University Beijing China Department of chemistry University of California Santa Cruz Santa Cruz USA

Electron transfer through the self-assembled monolayers (SAMs) on gold nanopar-ticles is investigated by using the monolayer protected gold nanoclusters (MPCs) as elec-tron-transfer mediators. 3-Mercaptopropionic acid (MPA) and 11-meraptoundecanoic acid (MUA) MPCs were employed to catalyze the redox reaction between potassium ferricyanide and sodium thiosulfate. The catalytic mechanism was proposed that the MPCs act as diffusing elec-tron-mediators and electron transfers to and from the MPCs surface. Therefore the electron transfer rate through the capping layers would be proportional to the MPCs catalyzed reaction rate, which was monitored by the UV absorbance of ferricyanide. The calculated apparent rate constant was orders of magnitude smaller than that of the maximum of tunneling current, which was attributed to the splited energy level of the nanoscale particles.

关键词： electron transfer, three-dimensional self-assembled monolayers, redox reaction, electron transfer mediator, surface effect.

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On the coupled NBEM and FEM for a class of nonlinear exterior Dirichlet problem in R^(2*)

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Science china Mathematics 2004年第z1期47卷 181-189页

作者： WU Zhengpeng, KANG Tong & YU Dehaoinstitute of Computational Mathematics and Scientific/Engineering Computing, academy of Mathematics and System sciences, chinese academy of sciences, beijing 100080, china Department of applied Mathematics, beijing Broadcasting institute, beijing 100024, china Combinatorial and Computational Mathematics Center, Pohang university of Science and Technology, Phoang 790-784, Republic of Korea institute of Computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing China Department of applied Mathematics Beijing Broadcasting Institute Beijing China Combinatorial and Computational Mathematics Center Pohang University of Science and Technology Phoang Republic of Korea

In this paper, based on the natural boundary reduction advanced by Feng and Yu, we couple the finite elementapproach with the natural boundary element method to study theweak solvability and Galerkin approximation of a class ofnonlinear exterior boundary value problems. The analysis is mainlybased on the variational formulation with *** provethe error estimate of the finite element solution and obtain theasymptotic rate of convergence. Finally, we also give anumerical example.

关键词： natural boundary integral method, finite element method, coupling method, error estimate.

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A fiducial argument for generalized p-value

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Science china Mathematics 2007年第7期50卷 957-966页

作者： Xin-min LI~(1+) Xing-zhong XU~2 Guo-ying LI~3 1 institute of applied Mathematics,Shandong university of Technology,Zibo 255049,china 2 Department of Mathematics,beijing institute of Technology,beijing 100801,china 3 academy of Mathematics and Systems Science,chinese academy of sciences,beijing 100800,china institute of applied Mathematics Shandong University of Technology Zibo China Department of Mathematics Beijing Institute of Technology Beijing China academy of Mathemtics and Systems Science Chinese Academy of Sciences Beijing China

This paper provides a general method for constructing generalized p-value via the fiducial ***,the power properties of the generalized test are *** illustrations, the two-parameter exponential distribution and unbalan... 详细信息

关键词： fiducial distribution generalized p-value frequency property two-parameter exponential distribution variance component 62F03 62E15

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A Sterically Hindered Zirconocene Complex (1,2-Ph_2C_5H_3)_2ZrCl_2:Synthesis,Structure and Properties as Olefin Polymerization Catalyst

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chinese Chemical Letters 2000年第7期11卷 641-644页

作者： Fan ZHANG Ying MU Yue Tao ZHANG Cong Xi CHEN Hui Min ZHAI Han HONG(Department of chemistry, Jilin university, changchun 130023institute of chemistry, chinese academy of sciences, beijing 100080) Department of chemistry Jilin University institute of chemistry Chinese Academy of Sciences

An unbridged zirconocene complex bis(1,2-diphenylcyclopentadienyl)zirconium dichloride [(1,2-Ph2-C5H3)2ZrCl2] 1 has been synthesized and structurally characterized. When activated by MAO, 1 produces ultra-high molecular weight polyethylene with high melting transition temperature, as well as atactic oligopropylene with average molecular weight of ~1150 g mol-1.

关键词： Zirconium complex metallocene catalyst olefin polymerization

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Synthesis and Characterization of ChiralLiquid Crystal CMPPCDP

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Chemical Research in chinese Universities 1994年第3期10卷 202-205页

作者： TIAN Yan-qing , ZHAO Ying-ying, SU Feng-yu and TANG Xin-yi(Department of chemistry,Jilin university,changchun,130023)ZHAO Xiao-guang and ZHOU En-le(Changcnun institute of applied chemistry,chinese academy of sciences,changchun,130022 )

novel chiral liquid crystal4'-( 2-chloro-4methylpentanoyloxy ) phenyl 2-cyano-3-(4' -n-dodecyloxyphenyl)propenoate (CMPPCDP ) was synthesized. The compound was characterized usingIR, ￣1H NNIR, elementary analysis. The liquid crystalline pliasc transition wasstudied using optical polarized micrography and differential scanning calorimetry.

关键词： Liquid crystal Smectic liquid crystal S-1-chloro-4-methyl pentanoiciacid ester

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A Self-consistent Calculation and an Anisotropic Wavelength Cut off Energy of Spin-wave Spectrumin Magnetic Tunnel Junctions

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Journal of Materials Science & Technology 2001年第2期17卷 197-202页

作者： Xiufeng HAN State Key Laboratory of Magnetism, institute of Physics, chinese academy of sciences, beijing 100080, china Terunobu Miyazaki Department of applied Physics, graduate School of Engineering, Tohoku university, Aoba-yama 08, Sendai 980-8579, Japa State Key Lab. of Magnetism Inst. of Phys. Chinese Acad. of Sci. Beijing 100080 China

Temperature dependence of tunnel magnetoresistance (TMR) ratio, resistance, and coercivity from 4.2 K to room temperature (RT), applied de bias voltage dependence of the TMR ratio and resistances at 4.2 K and RT, tunnel current I and dynamic conductance dI/dV as functions of the de bias voltage at 4.2 K, and inelastic electron tunneling (IET) spectroscopy, d(2)I/dV(2) versus V, at 4.2 K for a tunnel junction of Ta(5 nm)/Ni79Fe21(25 nm)/Ir22Mn78(12 nm)/Co75Fe25(4 nm)/Al(0.8 nm)-oxide/Co75Fe25(4 nm)/Ni79Fe21(25 nm)/Ta(5 nm) were systematically investigated. High TMR ratio of 59.2% at 4.2 K and 41.3% at RT were observed for this junction after annealing at 275 degreesC for an hour. The temperature dependence of TMR ratio and resistances from 4.2 to 300 K at 1.0 mV bias and the de bias voltage dependence of TMR ratio at 4.2 K from 0 to 80 mV can be evaluated by a comparison of self-consistent calculations with the experimental data based on the magnon-assisted inelastic excitation model and theory. An anisotropic wavelength cutoff energy of spin-wave spectrum in magnetic tunnel junctions (MTJs) was suggested, which is necessary for self-consistent calculations, based on a series of IET spectra observed in the MTJs.

关键词： off TMR A Self-consistent Calculation and an Anisotropic Wavelength Cut Energy of Spin-wave Spectrumin Magnetic Tunnel Junctions wave Figure than

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In-Situ Microscopic FTIR Spectroelectrochemistry of Ascorbic Acid in Poly（ethylene glycol）/LiClO4 Electrolyte Paste and in the Presence of Dispersed Cobalt Hexacyanoferrate Microcrystalline Powder

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Chemical Research in chinese Universities 1999年第1期 3-5页

作者： GUO Li ping ** (Laboratory of Electroanalytical chemistry, changchun institute of applied chemistry, chinese academy of sciences, changchun, 130022) LIN Xiang qin *** (Department of chemistry, university of Science and Technology of Chi

ＩｎｔｒｏｄｕｃｔｉｏｎＴｒａｎｓｉｔｉｏｎｍｅｔａｌｈｅｘａｃｙａｎｏｆｅｒａｔｅｓ，ＰｒｕｓｓｉａｎＢｌｕｅ（ＰＢ）ａｎｄｉｔｓｓｕｂｓｔｉｔｕｔｅｄａｎａｌｏｇｕｅｓ，ｓｕｃｈａｓｃｏｂａｌｔｈｅｘａｃｙａｎｏ... 详细信息

ＩｎｔｒｏｄｕｃｔｉｏｎＴｒａｎｓｉｔｉｏｎｍｅｔａｌｈｅｘａｃｙａｎｏｆｅｒａｔｅｓ，ＰｒｕｓｓｉａｎＢｌｕｅ（ＰＢ）ａｎｄｉｔｓｓｕｂｓｔｉｔｕｔｅｄａｎａｌｏｇｕｅｓ，ｓｕｃｈａｓｃｏｂａｌｔｈｅｘａｃｙａｎｏｆｅｒａｔｅ（ＣｏＨＣＦ），ｈａｖ...

关键词： In situ MFTIRs Ascorbic acid Cobalt hexacyanoferrate Polymer electrolyte Microcrystalline Docking mechanism

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A systematic investigation of high harmonic generation using mid-infrared driving laser pulses

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Science china(Physics,Mechanics & Astronomy) 2010年第6期53卷 1054-1059页

作者： YAO JinPing 1,2 ,XIONG Hui 1 ,XU Han 1 ,FU YuXi 1,2 ,ZENG Bin 1,2 ,CHU Wei 1,2 ,CHENG Ya 1 ,XU ZhiZhan 1 ,LIU XiaoJun 3 & CHEN Jing 4,5 1 State Key Laboratory of High Field Laser Physics,Shanghai institute of Optics and Fine Mechanics,chinese academy of sciences,Shanghai 201800,china 2 graduate university of chinese academy of sciences,beijing 100049,china 3 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,Wuhan institute of Physics and Mathematics,chinese academy of sciences,Wuhan 430071,china 4 institute of applied Physics and Computational Mathematics,beijing 100088,china 5 Center for applied Physics and Technology,Peking university,beijing 100084,china State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai China graduate university of chinese academy of sciences Beijing China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan China institute of applied Physics and Computational Mathematics Beijing China Center for applied Physics and Technology Peking University Beijing China

We report on a systematic investigation of the influences of gas pressure,focal position and focusing geometry on high harmonic generation by use of mid-infrared femtosecond laser pulses. We also discuss the spatial characteristics of harmonics under different focusing conditions. By optimizing the parameters,we experimentally observed the generation of 1 kHz,low divergence coherent X-ray beams in the water-window region.

关键词： mid-infrared laser pulses high harmonic generation water window

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Comparison of dark energy models:A perspective from the latest observational data

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中国科学：物理学、力学、天文学英文版 2010年第9期53卷 1631-1645页

作者： LI Miao1,2,LI XiaoDong2,3 & ZHANG Xin1,4 1Kavli institute for Theoretical Physics china,chinese academy of sciences,beijing 100190,china 2Key Laboratory of Frontiers in Theoretical Physics,institute of Theoretical Physics,chinese academy of sciences,beijing 100190,china 3Interdisciplinary Center for Theoretical Study,university of Science and Technology of china,Hefei 230026,china 4Department of Physics,College of sciences,Northeastern university,Shenyang 110004,china Kavli institute for Theoretical Physics china Chinese Academy of Sciences Key Laboratory of Frontiers in Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Interdisciplinary Center for Theoretical Study University of Sc

We compare some popular dark energy models under the assumption of a flat universe by using the latest observational data including the type Ia supernovae Constitution compilation,the baryon acoustic oscillation measurement from the Sloan Digital Sky Survey,the cosmic microwave background measurement given by the seven-year Wilkinson Microwave Anisotropy Probe observations and the determination of H0 from the Hubble Space *** comparison statistics such as the Bayesian and Akaike information criteria are applied to assess the worth of the *** statistics favor models that give a good fit with fewer *** on this analysis,we find that the simplest cosmological constant model that has only one free parameter is still preferred by the current *** other dynamical dark energy models,we find that some of them,such as the αdark energy,constant w,generalized Chaplygin gas,Chevalliear-Polarski-Linder parametrization,and holographic dark energy models,can provide good fits to the current data,and three of them,namely,the Ricci dark energy,agegraphic dark energy,and Dvali-Gabadadze-Porrati models,are clearly disfavored by the data.

关键词： dark energy models observational constraints model comparison information criteria

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