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  • American Institute of Physics (AIP)  (18)
  • PANGAEA  (5)
  • Copernicus  (4)
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  • 1
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    Observations of muskoxen and caribou in the high Arctic
    PANGAEA
    In:  Supplement to: Parker, G R; Ross, R K (1976): Summer habitat use by muskoxen (Ovibos moschatus) and peary caribou (Rangifer tarandus pearyi) in the Canadian High Arctic. Polarforschung, 46(1), 12-25, hdl:10013/epic.29430.d001
    Details
    Publication Date: 2023-05-12
    Description: Summary: Summer daily activity and movement patterns and habitat selectivity by Peary caribou (Rangifer tarandus pearyi) and muskoxen (Ovibos moschatus) were studied at two sites in Canada's High Arctic. Caribou showed a greater mobility and broader selection of habitat than muskoxen. Muskoxen fed more than they rested in contrast to the greater amount of time spent resting than feeding by caribou. The sedge-producing hydric-meadow vegetalion type was highly selected for by muskoxen at both study areas; caribou selected against the hydric-meadow type and preferred the polar desert and mesic-meadow types. Caribou displayed a greater variety in plant species selection than muskoxen, favouring willow (Salix arctica), grasses, forbs, and the flowers of vascular plants- Muskoxen feci extensively on sedges in the hydric-meadow. It is suggested the abundance and distribution of sedge-producing meadows may control the regional abundance and distribution of muskoxen. Winter climate is probably the ultimate factor controlling densities of muskoxen and caribou in the High Arctic.
    Keywords: Axel Heiberg Island, Canadian Arctic; Bailey_Point; Melville Island; Mokka_Fjord; OBSE; Observation
    Type: Dataset
    Format: application/zip, 4 datasets
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    DATA PANGAEA
  • 2
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    Tab. 1: The composition of muskox herds observed at the two study areas
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Animal; Animals; Average; Axel Heiberg Island, Canadian Arctic; DATE/TIME; Date/time end; Date/time start; Mokka_Fjord; Number of observations; OBSE; Observation; ORDINAL NUMBER
    Type: Dataset
    Format: text/tab-separated-values, 79 data points
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    DATA PANGAEA
  • 3
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    Tab. 4: The measured above-ground annual production of vascular plants in the recognized vegetation types
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Axel Heiberg Island, Canadian Arctic; Bailey_Point; DATE/TIME; Event label; Melville Island; Mokka_Fjord; OBSE; Observation; Primary production of carbon per area, yearly; Vegetation type
    Type: Dataset
    Format: text/tab-separated-values, 65 data points
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    DATA PANGAEA
  • 4
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    Tab. 5+6: The percentage of muskox feeding observations per vegetation type
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Axel Heiberg Island, Canadian Arctic; Bailey_Point; Event label; Melville Island; Mokka_Fjord; Number of observations; OBSE; Observation; Percentage; Period; Species, common name; Table
    Type: Dataset
    Format: text/tab-separated-values, 121 data points
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    DATA PANGAEA
  • 5
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    Tab. 3: The mean distances travelled by muskoxen and caribou herds per one hour of activity
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Axel Heiberg Island, Canadian Arctic; Bailey_Point; Distance; Event label; Melville Island; Mokka_Fjord; Number of observations; OBSE; Observation; Period; Species, common name
    Type: Dataset
    Format: text/tab-separated-values, 36 data points
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  • 6
    Electronic Resource
    Electronic Resource
    Direct calculation of collisional properties that require energy derivatives of the S matrix: Results for the reaction He+H+2(r harp over l)HeH++H (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 2516-2522 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The Darakjian–Hayes direct method for determining quantum lifetimes for three atoms scattering in three physical dimensions is used to determine accurate state-to-state time delays for the reaction of helium with H+2 for total angular momentum J=0. These results are compared with the time delays obtained by numerical differentiation of the S-matrix elements generated using the APH (adiabatically adjusting principal-axis hyperspherical) formulation of Pack and Parker. The direct method was found to be accurate and efficient for calculating the energy derivatives of the S matrix. The calculated eigenvalues of Smith's collision lifetime matrix (eigen lifetimes) for this reaction predict numerous long-lived metastable states, many with lifetimes over 0.5 ps. The extent of the coupling of metastable states to specific scattering states provides an indication of the nature and magnitude of the time delays associated with particular state-to-state scattering processes. The direct method for calculating the energy derivatives of the S matrix is also found to be accurate and efficient for determining the energy derivative of the cumulative reaction probability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460956
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Quantum reactive scattering in three dimensions using hyperspherical (APH) coordinates. IV. Discrete variable representation (DVR) basis functions and the analysis of accurate results for F+H2 (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 2344-2361 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Accurate 3D coupled channel calculations for total angular momentum J=0 for the reaction F+H2→HF+H using a realistic potential energy surface are analyzed. The reactive scattering is formulated using the hyperspherical (APH) coordinates of Pack and Parker. The adiabatic basis functions are generated quite efficiently using the discrete variable representation method. Reaction probabilities for relative collision energies of up to 17.4 kcal/mol are presented. To aid in the interpretation of the resonances and quantum structure observed in the calculated reaction probabilities, we analyze the phases of the S matrix transition elements, Argand diagrams, time delays and eigenlifetimes of the collision lifetime matrix. Collinear (1D) and reduced dimensional 3D bending corrected rotating linear model (BCRLM) calculations are presented and compared with the accurate 3D calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457976
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  • 8
    Electronic Resource
    Electronic Resource
    The role of carbon on the electrical properties of polycrystalline Si1−yCy and Si0.82−yGe0.18Cy films (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 6182-6189 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A comparison is made of the electrical effects of carbon in n- and p-type in situ doped polycrystalline Si1−yCy and Si0.82−yGe0.18Cy layers. Values of resistivity as a function of temperature, effective carrier concentration and Hall mobility are reported. The n-type polycrystalline Si1−yCy and Si0.82−yGe0.18Cy films show dramatic increases in resistivity with carbon content, rising from 0.044 Ω cm to 450 Ω cm (0 and 0.8% C) and 0.01 Ω cm to 2.4 Ω cm (0 and 0.6% C), respectively. In contrast, the increase in B-doped films is much less severe, rising from 0.001 Ω cm to 0.939 Ω cm (0 and 7.9% C) and 0.003 Ω cm to 0.015 Ω cm (0 and 4% C) for the Si1−yCy and Si0.82−yGe0.18Cy layers, respectively. The grain boundary energy barrier, determined from the temperature dependence of the resistivity, is found to vary as the square of the C content in the n-type polycrystalline Si1−yCy and Si0.82−yGe0.18Cy layers, but linearly in the p-type Si1−yCy layers. The square law dependence seen in the n-type layers for C contents up to 0.9% is explained by an increase in the grain boundary trap density due to the presence of carbon, whereas the linear relationship seen in the p-type layers for C contents between 2% and 8% is explained by a shift in the grain boundary trap energy toward the valence band. Finally, lower values of grain boundary energy barrier are obtained in p-type Si0.82−yGe0.18Cy layers with a C content of 4% than in equivalent Si1−yCy layers, which could be explained by a larger shift in trap energy toward the valence band. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1343896
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  • 9
    Electronic Resource
    Electronic Resource
    Micromagnetic simulations of submicron cobalt dots (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5514-5516 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Numerical simulations of submicron Co extruded elliptical dots were performed to illustrate the relative importance of different physical parameters on the switching behavior in the easy direction. Shape, size, magnetic moment magnitude, and the magnitude and distribution of the crystalline anisotropicity were varied. The simulation represents magnetostatic, exchange, and crystalline anisotropicity fields on a structured mesh using finite difference techniques. The smooth boundary of the dots is accurately represented by use of the embedded curve boundary method. Agreement with experimental hysteresis measurements of submicron dot arrays is obtained when an appropriate angular distribution of the grain anisotropicity axes is invoked. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373389
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  • 10
    Electronic Resource
    Electronic Resource
    Li+FH reactive cross sections from J=0 accurate quantum reactivity (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 2269-2270 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Accurate three dimensional quantum calculations have been carried out for the Li+HF reaction at zero total angular momentum J on a potential energy surface fitted to ab initio points. By adopting a J shifting approximation reactive cross sections are estimated and compared with the experiment. The agreement is very good.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465238
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