Search Results - (Author, Cooperation:W. Z. Li)

Showing 1 - 20 results of 20, query time: 0.29s Refine Results
  1. 1
    Staff View
    Publication Date:
    2011-11-19
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    Animals ; *Biodiversity ; Carbon Dioxide ; Carbon Isotopes ; China ; *Ecosystem ; *Extinction, Biological ; Fires ; *Fossils ; Geologic Sediments ; Invertebrates/classification ; Isotopes ; Lead ; Mass Spectrometry ; Methane ; Oceans and Seas ; Plants/classification ; Radioisotope Dilution Technique ; Radiometric Dating ; Seawater/chemistry ; Time ; Uranium ; Vertebrates/classification
    Published by:
    http://www.aaas.org/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Y Li, W Z Fu and M Z Li
    Institute of Physics (IOP)
    Published 2018
    Staff View
    Publication Date:
    2018-02-22
    Publisher:
    Institute of Physics (IOP)
    Print ISSN:
    1755-1307
    Electronic ISSN:
    1755-1315
    Topics:
    Geography
    Geosciences
    Physics
    Published by:
    http://www.iop.org/

    Latest Papers from Table of Contents or Articles in Press
  3. 3
    H M Ma, J X Ma, X Xu and Z W Li
    Institute of Physics (IOP)
    Published 2018
    Staff View
    Publication Date:
    2018-06-03
    Publisher:
    Institute of Physics (IOP)
    Print ISSN:
    1755-1307
    Electronic ISSN:
    1755-1315
    Topics:
    Geography
    Geosciences
    Physics
    Published by:
    http://www.iop.org/

    Latest Papers from Table of Contents or Articles in Press
  4. 4
    Staff View
    Publication Date:
    2018-01-04
    Publisher:
    Nature Publishing Group (NPG)
    Electronic ISSN:
    2041-1723
    Topics:
    Biology
    Chemistry and Pharmacology
    Natural Sciences in General
    Physics
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  5. 5
    Qu, B. D. ; Zhong, W. L. ; Wang, K. M. ; Zhang, P. L. ; Wang, Z. L. ; Li, W. Z.

    [S.l.] : American Institute of Physics (AIP)
    Published 1993
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Ferroelectric PbTiO3 films were deposited by ion-beam-assisted deposition (O2+Ar 75–150 eV). The effects of ion bombardment on the Pb/Ti ratio and the structures of the film are discussed. For a given target-substrate distance and substrate temperature, the Pb/Ti ratio decreased with increasing bombarding beam energy. Compared with the films deposited without ion bombardment, the deposition rate was increased under ion bombardment, which is attributed to an increase in the surface reaction rate. The crystal grains are larger for films deposited under ion bombardment, which implies that ion bombardment enhances the surface mobility of adatoms and hence the growth kinetics of the growing films. Dielectric and ferroelectric properties of the as-deposited films are also reported.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.354644

    Articles: DFG German National Licenses
  6. 6
    Wang, J. L. ; Zhao, R. W. ; Tang, N. ; Li, W. Z. ; Gao, Y. H. ; Yang, F. M. ; de Boer, F. R.

    [S.l.] : American Institute of Physics (AIP)
    Published 1994
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Structural and magnetic properties of the R2Fe17−xGax compounds (R=Y, Ho, 0≤x≤6) have been investigated. All investigated Ho2Fe17−xGax compounds with x(approximately-greater-than)2.5 crystallize in the Th2Zn17-type structure and the others in the Th2Ni17-type structure. The substitution of Ga for Fe leads to an increase in lattice constants a, c, and unit-cell volume, a decrease of the average Fe moment, and a maximum of the Curie temperature as a function of the Ga concentration at x=3, for both Y2Fe17−xGax and Ho2Fe17−xGax compounds. The high magnetic field leads to a spin phase transition from the ferromagnetic to the canted phase. The critical field Bc of the transition decreases with increasing Ga concentration. The exchange interaction constants JTT between Fe–Fe spins and JRT between R–T spins have been derived from a mean field analysis of Curie temperature. It has been found that JTT increases at first, going through a maximum at x=3, then decreases with increasing x, whereas JRT is almost independent of the Ga content, which is consistent with the result obtained from a mean field analysis of the high field magnetization curves of the Ho2Fe17−xGax.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.358147

    Articles: DFG German National Licenses
  7. 7
    Li, W.-Z. ; Tang, N. ; Wang, J.-L. ; Yang, Fuming ; Zeng, Y. W. ; Zhu, J. J. ; de Boer, F. R.

    [S.l.] : American Institute of Physics (AIP)
    Published 1994
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Magnetic properties of Sm2(Fe1−xGax)17 compounds and their nitrides have been studied. Substitution of Ga for Fe leads to an increase in lattice constants. Introduction of nitrogen results in a further increase in lattice constants. Substitution of Ga for Fe causes a dramatic change of the Curie temperature of the Sm2(Fe1−xGax)17 compounds. When x=0.2 the Curie temperature is enhanced by about 200 K. X-ray-diffraction patterns of aligned samples of Sm2(Fe1−xGax)17 compounds show that alloys with x=0.15, 0.20, and 0.25 exhibit uniaxial anisotropy at room temperature. The introduction of nitrogen made the samples with x≤0.4 exhibit uniaxial anisotropy at room temperature. The Curie temperature of the nitrides decreases with the Ga concentration. The anisotropy fields of the nitrides derived from the high-field magnetization. The changes of the magnetic anisotropy, saturation magnetization, and the moment of the Fe atoms in the nitrides and their parent compounds with Ga concentration are discussed.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.358148

    Articles: DFG German National Licenses
  8. 8
    Wang, J. L. ; Lin, W. G. ; Tang, N. ; Li, W. Z. ; Gao, Y. H. ; Yang, F. M.

    [S.l.] : American Institute of Physics (AIP)
    Published 1994
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Structural and magnetic properties of the interstitial (Er1−xRx)2Fe17Ny compounds with R=Y and Gd, x=0, 0.1, 0.25, 0.4, 0.5, 0.6, 0.75, and 1.0, 2〈y〈3, have been investigated. All the parent compounds crystallize in the Th2Ni17-type structure, except for Gd2Fe17 which crystallizes in the Th2Zn17-structure. All nitrides preserve the same structure as the parents. Introduction of nitrogen results in an increase in lattice constants a and c, and the expansion of unit-cell volume is about 6%. The Curie temperature was found to increase distinctly after nitrogenation. Nitrogen absorption leads to an increase in saturation magnetization, the values of the saturation magnetization increase monotonically with increasing Y or Gd concentration. Nitrogenation increases the uniaxial anisotropy of the Er sublattice, and causes a spin reorientation. The Y and Gd concentration dependencies of the spin reorientation temperature Tsr exhibit maxima. The tentative spin phase diagrams are presented.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.355410

    Articles: DFG German National Licenses
  9. 9
    He, J. L. ; Li, W. Z. ; Li, H. D.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1996
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    A composite hardness model based on the function of depth weight factor is presented. The model can be applied to determine the characteristic hardness of surface coatings which are too thin for the hardness to be directly measured. Its application requires only composite hardness data obtained from coated specimens by conventional microhardness measurement. DLC, TiN, and Cu films on substrates of glass, silicon, and AISI 52100 steel were used to verify this composite hardness model. It proved valid for a variety of cases. © 1996 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.117595

    Articles: DFG German National Licenses
  10. 10
    Li, W. Z. ; Wen, J. G. ; Ren, Z. F.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 2001
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Carbon nanotube junctions are of great interest in the fundamental research and nanoelectronic applications. Identical carbon nanotube Y junctions have been successfully synthesized by pyrolysis of methane over cobalt supported on magnesium oxide. The Y junctions have very straight arms with uniform diameters, and the angles between the three arms are close to 120°. Based on the analysis on the structure of the Y junctions the growth mechanism has been discussed. The fact that all the Y junctions grow in a similar way may be very important in the development of nanoelectronic devices. © 2001 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.1404400

    Articles: DFG German National Licenses
  11. 11
    Lao, J. Y. ; Li, W. Z. ; Wen, J. G. ; Ren, Z. F.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 2002
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Boron carbide nanolumps are formed on the surface of multiwall carbon nanotubes by a solid-state reaction between boron and carbon nanotubes. The reaction is localized so that the integrity of the structure of carbon nanotubes is maintained. Inner layers of multiwall carbon nanotubes are also bonded to boron carbide nanolumps. These multiwall carbon nanotubes with boron carbide nanolumps are expected to be the ideal reinforcing fillers for high-performance composites because of the favorable morphology. © 2002 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.1435062

    Articles: DFG German National Licenses
  12. 12
    Pan, Z. W. ; Xie, S. S. ; Chang, B. H. ; Wang, C. Y. ; Lu, L. ; Liu, W. ; Zhou, W. Y. ; Li, W. Z. ; Qian, L. X.

    [s.l.] : Macmillan Magazines Ltd.
    Published 1998
    Staff View
    ISSN:
    1476-4687
    Source:
    Nature Archives 1869 - 2009
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Notes:
    [Auszug] Carbon nanotubes can now be produced in large quantities by either arc methods, or thermal decomposition of hydrocarbons,. Here we report that pyrolysis of acetylene over iron/silica substrates is an effective method with which to produce very long, multiwalled carbon nanotubes that reach about ...
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1038/29206

    Articles: DFG German National Licenses
  13. 13
    Li, W.-Z. ; Wu, J.-B. ; Chen, F. ; Tang, J.-C. ; Cheng, K.-J.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0375-9601
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0375-9601(89)90661-0

    Articles: DFG German National Licenses
  14. 14
    Wu, J.-B. ; Ying, H.-P. ; Li, W.-Z.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0375-9601
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0375-9601(92)90688-I

    Articles: DFG German National Licenses
  15. 15
    Li, W.-Z. ; Zhang, J.-B.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0370-2693
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0370-2693(88)91122-7

    Articles: DFG German National Licenses
  16. 16
    Li, W.-Z. ; Cui, F.-Z. ; Liao, Y. ; Li, H.-D.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0042-207X
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0042-207X(90)90046-2

    Articles: DFG German National Licenses
  17. 17
    Wang, J. ; Lemberton, J. L. ; Li, W. Z. ; Pérot, G.
    Springer
    Published 1996
    Staff View
    ISSN:
    1572-879X
    Keywords:
    cyclopentanone ; cyclopentanethiol ; sulfide catalysts ; CoMo/Al2O3
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract The transformation of cyclopentanone in the presence of H2S/H2 was investigated at atmospheric pressure over a sulfided CoMo/Al2O3 catalyst. The main reaction products were cyclopentanethiol and cyclopentene, the relative amounts of which depended on the reaction temperature and on the H2S to cyclopentanone molar ratio. The best results were obtained at 220°C, with a 2.5 H2S to cyclopentanone molar ratio: under these conditions, the cyclopentanethiol molar selectivity remained at about 90%, in a range of cyclopentanone conversion of 10–70%.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00814470

    Articles: DFG German National Licenses
  18. 18
    Li, W.-Z.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0042-207X
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0042-207X(89)90236-4

    Articles: DFG German National Licenses
  19. 19
    Liu, C. H. ; Li, W. -Z. ; Li, H. -D.
    Springer
    Published 1995
    Staff View
    ISSN:
    1573-4811
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00423384

    Articles: DFG German National Licenses
  20. 20
    Xie, S. S. ; Zhou, W. Y. ; Qian, L. X. ; Mao, J. M. ; Li, W. Z.
    Springer
    Published 1998
    Staff View
    ISSN:
    1573-4811
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1023/A:1006678405817

    Articles: DFG German National Licenses