Search Results - (Author, Cooperation:R. Timm)

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  1. 1
    W. F. Laurance ; D. C. Useche ; J. Rendeiro ; M. Kalka ; C. J. Bradshaw ; S. P. Sloan ; S. G. Laurance ; M. Campbell ; K. Abernethy ; P. Alvarez ; V. Arroyo-Rodriguez ; P. Ashton ; J. Benitez-Malvido ; A. Blom ; K. S. Bobo ; C. H. Cannon ; M. Cao ; R. Carroll ; C. Chapman ; R. Coates ; M. Cords ; F. Danielsen ; B. De Dijn ; E. Dinerstein ; M. A. Donnelly ; D. Edwards ; F. Edwards ; N. Farwig ; P. Fashing ; P. M. Forget ; M. Foster ; G. Gale ; D. Harris ; R. Harrison ; J. Hart ; S. Karpanty ; W. J. Kress ; J. Krishnaswamy ; W. Logsdon ; J. Lovett ; W. Magnusson ; F. Maisels ; A. R. Marshall ; D. McClearn ; D. Mudappa ; M. R. Nielsen ; R. Pearson ; N. Pitman ; J. van der Ploeg ; A. Plumptre ; J. Poulsen ; M. Quesada ; H. Rainey ; D. Robinson ; C. Roetgers ; F. Rovero ; F. Scatena ; C. Schulze ; D. Sheil ; T. Struhsaker ; J. Terborgh ; D. Thomas ; R. Timm ; J. N. Urbina-Cardona ; K. Vasudevan ; S. J. Wright ; G. J. Arias ; L. Arroyo ; M. Ashton ; P. Auzel ; D. Babaasa ; F. Babweteera ; P. Baker ; O. Banki ; M. Bass ; I. Bila-Isia ; S. Blake ; W. Brockelman ; N. Brokaw ; C. A. Bruhl ; S. Bunyavejchewin ; J. T. Chao ; J. Chave ; R. Chellam ; C. J. Clark ; J. Clavijo ; R. Congdon ; R. Corlett ; H. S. Dattaraja ; C. Dave ; G. Davies ; M. Beisiegel Bde ; N. da Silva Rde ; A. Di Fiore ; A. Diesmos ; R. Dirzo ; D. Doran-Sheehy ; M. Eaton ; L. Emmons ; A. Estrada ; C. Ewango ; L. Fedigan ; F. Feer ; B. Fruth ; J. G. Willis ; U. Goodale ; S. Goodman ; J. C. Guix ; P. Guthiga ; W. Haber ; K. Hamer ; I. Herbinger ; J. Hill ; Z. Huang ; I. F. Sun ; K. Ickes ; A. Itoh ; N. Ivanauskas ; B. Jackes ; J. Janovec ; D. Janzen ; M. Jiangming ; C. Jin ; T. Jones ; H. Justiniano ; E. Kalko ; A. Kasangaki ; T. Killeen ; H. B. King ; E. Klop ; C. Knott ; I. Kone ; E. Kudavidanage ; J. L. Ribeiro ; J. Lattke ; R. Laval ; R. Lawton ; M. Leal ; M. Leighton ; M. Lentino ; C. Leonel ; J. Lindsell ; L. Ling-Ling ; K. E. Linsenmair ; E. Losos ; A. Lugo ; J. Lwanga ; A. L. Mack ; M. Martins ; W. S. McGraw ; R. McNab ; L. Montag ; J. M. Thompson ; J. Nabe-Nielsen ; M. Nakagawa ; S. Nepal ; M. Norconk ; V. Novotny ; S. O'Donnell ; M. Opiang ; P. Ouboter ; K. Parker ; N. Parthasarathy ; K. Pisciotta ; D. Prawiradilaga ; C. Pringle ; S. Rajathurai ; U. Reichard ; G. Reinartz ; K. Renton ; G. Reynolds ; V. Reynolds ; E. Riley ; M. O. Rodel ; J. Rothman ; P. Round ; S. Sakai ; T. Sanaiotti ; T. Savini ; G. Schaab ; J. Seidensticker ; A. Siaka ; M. R. Silman ; T. B. Smith ; S. S. de Almeida ; N. Sodhi ; C. Stanford ; K. Stewart ; E. Stokes ; K. E. Stoner ; R. Sukumar ; M. Surbeck ; M. Tobler ; T. Tscharntke ; A. Turkalo ; G. Umapathy ; M. van Weerd ; J. V. Rivera ; M. Venkataraman ; L. Venn ; C. Verea ; C. V. de Castilho ; M. Waltert ; B. Wang ; D. Watts ; W. Weber ; P. West ; D. Whitacre ; K. Whitney ; D. Wilkie ; S. Williams ; D. D. Wright ; P. Wright ; L. Xiankai ; P. Yonzon ; F. Zamzani
    Nature Publishing Group (NPG)
    Published 2012
    Staff View
    Publication Date:
    2012-07-27
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    Agriculture/statistics & numerical data ; Animals ; *Biodiversity ; Conservation of Natural Resources/*statistics & numerical data ; Data Collection ; Ecology/statistics & numerical data ; Endangered Species/*statistics & numerical data ; Environmental Pollution/adverse effects/statistics & numerical data ; Fires/statistics & numerical data ; Forestry/statistics & numerical data ; Interviews as Topic ; Mining/statistics & numerical data ; Population Growth ; Rain ; Reproducibility of Results ; Research Personnel ; Surveys and Questionnaires ; Temperature ; Trees/*physiology ; *Tropical Climate
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Timm, R. ; Willmott, P. R. ; Huber, J. R.

    [S.l.] : American Institute of Physics (AIP)
    Published 1996
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Laser ablation characteristics in vacuum using excimer radiation at 248 nm and pulse durations of 17 ns for Al, Sn and Ti are presented. Ablation yields are measured as a function of input laser energy and target refreshment rate using gravimetric techniques. The laser ablation thresholds for Al, Sn, and Ti are found to be 3.15, 0.89, and 2.35 J⋅cm−2, respectively. Ablation is inefficient, the majority of the laser input energy being shielded from the surface by the phenomenon of laser supported absorption, which results in heating of the nascent plasma. As the plasma becomes superheated during impingement of the laser pulse, energy is partially re-emitted in the form of black-body radiation. Mean kinetic energies of the ablation plasma species are determined by time resolved mass spectroscopy to be of the order of 5–50 eV. Target roughness and thin film morphology have been investigated using atomic force microscopy and scanning electron microscopy. Target roughness increases due to exfoliation and explosive boiling as the material is successively irradiated at a given point. Beyond a certain roughness, laser droplets are formed which propagate with the ablation plasma onto the growing film. Guidelines are presented for the rate of refreshment of exposed target material required to minimize incorporation of macroscopic material in the growing film. © 1996 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.362990

    Articles: DFG German National Licenses
  3. 3
    Willmott, P. R. ; Timm, R. ; Felder, P. ; Huber, J. R.

    [S.l.] : American Institute of Physics (AIP)
    Published 1994
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Copper (II) oxide films of high chemical and crystal purity have been grown on MgO(100) substrates using pulsed laser ablation (248 nm) of copper in conjunction with a pulsed oxidizing gas source (N2O). A novel experimental geometry is presented, in which the gas pulse and ablation plume cross close to their respective origins, where the particle and energy densities are highest. The properties of the films have been analyzed by x-ray diffraction and scanning electron microscopy. Growth rates are typically 0.025–0.035 A(ring)/laser pulse within the substrate temperature region of 50 to 600 °C. Results in the region of 350 °C are presented. Analysis by time-of-flight mass spectroscopy has identified the predominant gas-phase species during ablation and transportation to the growing surface.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.357562

    Articles: DFG German National Licenses
  4. 4
    Willmott, P. R. ; Timm, R. ; Huber, J. R.

    [S.l.] : American Institute of Physics (AIP)
    Published 1997
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The interaction and energy transfer of a laser ablation plasma of Ti with a pulsed N2 supersonic expansion are investigated using time-of-flight quadrupole mass spectroscopy and Langmuir probe techniques. The Ti ablation target and the exit nozzle of the pulsed gas source are positioned so that the plasma plume and gas pulse interact near to their respective origins, where the number density is still high, which hence results in strong coupling of the nascent plasma with the gas pulse. The timing between the gas pulse and ablation plume is shown to be critical in determining the scattering processes and the chemical nature of the films grown by this method, an example of which is presented. The degree of ionization of the plasma when crossed with the gas pulse compared to that for expansion into vacuum increases from less than 10−3 to 0.28±0.11, which is attributed to collision-induced ionization of Ti atoms. Further increasing the N2 number density quenches the ion signal. The effective bimolecular cross section for scattering of Ti with the high density N2 pulse is about 4 times larger than that with a static background of low pressure N2, while the fractional depletion of the N2 pulse by the Ti plume depends on the N2 number density in the pulse, indicating that at these high local pressures, collective effects prevail. We propose a simple model for the resulting evolution of the plasma based on electrostatic considerations. © 1997 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.366018

    Articles: DFG German National Licenses
  5. 5
    Timm, R. ; Willmott, P. R. ; Huber, J. R.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1997
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    TiN(001)[100]||Si(001)[100] parallel epitaxy of thin films grown by pulsed reactive crossed-beam laser ablation (KrF, 248 nm) is investigated in situ by reflection high-energy electron diffraction and ex situ by x-ray diffraction, full-hemispherical X-ray photoelectron diffraction and low-energy electron diffraction. TiN films are grown on atomically flat, initially two domain 2×1 reconstructed Si(001) surfaces at 100≤T≤800° C. Parallel epitaxy is found to prevail at T≥400 °C with growth rates in the 10−2 monolayer/pulse−1 range and a repetition rate of 2 Hz. The substrate and film morphologies are investigated using atomic force microscopy. © 1997 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.119757

    Articles: DFG German National Licenses
  6. 6
    Staff View
    Type of Medium:
    article
    Publication Date:
    2002
    Keywords:
    Astronomie ; Polarlicht
    In:
    Sterne und Weltraum, Bd. 41 (2002) H. 7, S. 66-72, 0039-1263
    Language:
    German

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  7. 7
    Staff View
    Publication Date:
    2018-06-02
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Electronic ISSN:
    2375-2548
    Topics:
    Natural Sciences in General
    Published by:
    http://www.aaas.org/

    Latest Papers from Table of Contents or Articles in Press