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  • Wiley-Blackwell  (45)
  • American Institute of Physics (AIP)  (25)
  • Deutsches GeoForschungsZentrum GFZ  (9)
  • EMBO Press  (8)
  • MDPI
  • 1
    Publication Date: 2019
    Description: Tourism is growing rapidly throughout the world, including nature-based tourism, but natural habitats are shrinking [...]
    Electronic ISSN: 2076-3298
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by MDPI
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  • 2
    Publication Date: 2019
    Description: Recreational ecology is an internationally evolving research field addressing the high demand for nature-based tourism and recreation, and its environmental impacts. This review aimed to analyze the research effort of recreational ecology studies published in four renowned journals in the field, the Journal of Sustainable Tourism, Tourism Management, the Journal of Environmental Management, and Environmental Management. Between 1976 and 2017, this review identified 145 papers focused on recreational ecology. The majority of research investigated the direct impacts of terrestrial activities in protected areas, in particular the impacts of walking and hiking on vegetation and trail conditions, and the impacts of wildlife viewing. A conceptual model was developed to describe the varied relationships between nature-based tourists and recreationists and the environment. Future research in recreational ecology should broaden its agenda to increase knowledge on indirect and long-term impacts; including on cryptic or less popular species; establish more specifically how the intensity of impacts depends on the amount of use other than in trampling studies; extend to other geographic areas such as developing countries, and nature-based spaces that are less protected and exposed to high visitation such as urban environments. Importantly, a much stronger focus needs to be on interdisciplinary approaches incorporating both environmental and social science techniques to determine ways of how visitor experiential needs can be reconciled with environmental conservation concerns in a rapidly increasing tourism and recreation economy.
    Electronic ISSN: 2076-3298
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by MDPI
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  • 3
    Publication Date: 2014-10-28
    Description: Electron holography at medium resolution simultaneously probes projected electrostatic and magnetostatic potentials as well as elastic and inelastic attenuation coefficients with a spatial resolution of a few nanometers. In this work, we derive how the elastic and inelastic attenuation can be disentangled. Using that result, we perform the first three dimensional tomographic reconstruction of potential and (in)elastic attenuation in parallel. The technique can be applied to distinguish between functional potentials and composition changes in nanostructures, as demonstrated using the example of a GaAs—Al 0.33 Ga 0.67 As core-shell nanowire.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
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  • 4
    Publication Date: 2014-10-31
    Description: Static electromagnetic stray fields around nanowires (NWs) are characteristic for a number of important physical effects such as field emission or magnetic force microscopy. Consequently, an accurate characterization of these fields is of high interest and electron holographic tomography (EHT) is unique in providing tomographic 3D reconstructions at nm spatial resolution. However, several limitations of the experimental setup and the specimen itself are influencing EHT. Here, we show how a deliberate restriction of the tomographic reconstruction to the exterior of the NWs can be used to mitigate these limitations facilitating a quantitative 3D tomographic reconstruction of static electromagnetic stray fields at the nanoscale. As an example, we reconstruct the electrostatic stray field around a GaAs-AlGaAs core shell NW and the magnetic stray field around a Co 2 FeGa Heusler compound NW.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
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  • 5
    Publication Date: 2019
    Description: Throughout the world, areas have been reserved for their exceptional environmental values, such as high biodiversity. Financial, political and community support for these protected areas is often dependent on visitation by nature-based tourists. This visitation inevitably creates environmental impacts, such as the construction and maintenance of roads, tracks and trails; trampling of vegetation and erosion of soils; and propagation of disturbance of resilient species, such as weeds. This creates tension between the conservation of environmental values and visitation. This review examines some of the main features of environmental impacts by nature-based tourists through a discussion of observational and manipulative studies. It explores the disturbance context and unravels the management implications of detecting impacts and understanding their causes. Regulation of access to visitor areas is a typical management response, qualified by the mode of access (e.g., vehicular, ambulatory). Managing access and associated impacts are reviewed in relation to roads, tracks and trails; wildlife viewing; and accommodations. Responses to visitor impacts, such as environmental education and sustainable tour experiences are explored. The review concludes with ten recommendations for further research in order to better resolve the tension between nature conservation and nature-based tourism.
    Electronic ISSN: 2076-3298
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by MDPI
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 4573-4580 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate the role of coherency in the elastic behavior of composition-modulated superlattices of fcc metals by atomistic computer simulations using Lennard–Jones potentials. Structures, energies, and elastic properties of incoherent superlattices are computed as a function of the compositional modulation wavelength along [001] and compared with those of coherent superlattices. Both superlattice types were taken to have a 10% lattice parameter mismatch between the two materials. The incoherent superlattices, as compared to coherent superlattices, were found to be more structurally disordered and exhibited greater elastic anomalies, which cannot be accounted for by the overall dimensional changes of the superlattices alone. High- and low-frequency elastic constants are briefly compared. It is proposed that increasing the structural disorder in the superlattices by increasing the lattice-parameter mismatch or by introducing a relative rotation between the two materials will enhance all of the elastic anomalies even further.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fe-doped semi-insulating InP layers grown by low-pressure organometallic vapor phase epitaxy with tertiarybutylphosphine have been used as a current block layer for high-speed 1.3-μm InGaAsP buried crescent lasers. The performance characteristics of such lasers are comparable to those of lasers with a PH3-grown Fe-doped semi-insulating InP current blocking layer over a measurement temperature range of 25 to 85 °C. A 3-dB modulation bandwidth of 17.5 GHz has been obtained at room temperature and a cw bias current of 100 mA.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 1692-1694 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Back reflectors have been fabricated by the deposition of ZnO films on textured Ag films. High deposition rates of ∼50 A(ring)/s have been achieved by the dc magnetron sputtering technique. The ZnO target used has been prepared in our laboratory. Amorphous silicon alloy solar cells have been deposited on the ZnO/textured Ag back reflector. Control samples have been prepared by the deposition of identical cells on the same back reflector, but in which the ZnO films have been prepared by a low-rate ∼5-A(ring)/s rf sputtering process. The short-circuit current density, which has been used as the primary test parameter for evaluating the back reflectors, is slightly superior in the case of the high-rate ZnO back reflector. The high-rate deposition process is, therefore, attractive for large-volume production application.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 185-196 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The zero-temperature energies and equilibrium volume expansions of point-defect-free asymmetrical grain boundaries (GBs) in bcc metals are determined using both a many-body potential fitted for Mo and a Johnson-type pair potential spline-fitted for α-Fe. The asymmetrical combinations of lattice planes considered involve one of the five densest planes of the bcc lattice on one side of the interface and a commensurate higher-index plane on the other. As in similar recent work on fcc metals, the two asymmetrical pure tilt boundaries obtained for any given combination of lattice planes give rise to pronounced energy cusps. When a twist component is added to the asymmetrical GB, thus forming a general (or "asymmetrical twist'') boundary, the energy and planar unit-cell area increase due to the introduction of screw dislocations. A comparison with earlier work on symmetrical GBs in bcc metals suggests that, except for the densest lattice planes, asymmetrical boundaries may actually have lower energies than symmetrical ones. The underlying causes are elucidated via a comparison with recent simulations of free surfaces and with the random grain-boundary limit (in which the interactions of the atoms across the interface are assumed to be entirely random).
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 3221-3236 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The interrelation between the number of nearest-neighbor atomic bonds broken upon formation of a grain boundary in an fcc metal and the related zero-temperature boundary energy is investigated by atomistic simulation. Using both a Lennard–Jones and an embedded-atom-method potential, the structures and energies of symmetrical and asymmetrical tilt and twist boundaries are determined. As in free surfaces, a practically linear relationship between the nearest-neighbor miscoordination per unit area of the grain boundary and the related interface energy is obtained. The so-called random-boundary model, in which the interactions across the interface are assumed to be entirely randomized, is shown to provide a basis for understanding the role of broken bonds in both high-angle grain boundaries and free surfaces, thus naturally permitting the analysis of ideal cleavage-fracture energies. A detailed study of low-angle boundaries shows that only the dislocation cores—but not their strain fields—give rise to broken bonds. The complementarity between the dislocation model of Read and Shockley for low-angle boundaries and a broken-bond model for high-angle boundaries is thus elucidated.
    Type of Medium: Electronic Resource
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