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  • RESEARCH AND SUPPORT FACILITIES (AIR)  (3)
  • Archaeobotany  (1)
  • 2020-2022
  • 1995-1999  (1)
  • 1985-1989  (3)
Collection
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Vegetation history and archaeobotany 8 (1999), S. 261-271 
    ISSN: 1617-6278
    Keywords: Hay ; Meadow ; Pasture ; Archaeobotany ; Europe ; Farming history
    Source: Springer Online Journal Archives 1860-2000
    Topics: Archaeology , Biology
    Notes: Abstract Hay malting and hay meadows have long been of fundamental ecological, economic and social importance in temperate Europe. A variety of archaeological sources suggests that hay making may date back to the Iron Age, but direct archaeobotanical evidence for this practice is problematic. Past grassland communities are imperfectly represented and preserved in archaeobotanical assemblages, and ancient meadow and pasture communities may not resemble present-day communities in terms of management practices or botanical composition. This paper explores the potential of ‘FIBS’ (Functional Interpretation of Botanical Surveys) in the archaeobotanical investigation of ancient grassland management. The botanical composition of present-day grassland communities was analysed in terms of functional attributes (e.g. canopy height) relevant to cutting, grazing and habitat productivity. The utility of these attributes for distinguishing between present-day meadow, pasture and unmanaged grassland communities has been evaluated. Similar analyses were performed on archaeobotanical data from Neolithic to post-Medieval northwestern and central Europe. Functional shifts over time, interpreted in the light of the functional analysis of modern grassland, suggest that hay-making was well established by the Iron Age. Avenues are suggested for the refinement and further development of the FIBS methodology in the archaeobotanical investigation of grassland management.
    Type of Medium: Electronic Resource
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  • 2
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    In:  Other Sources
    Publication Date: 2011-08-19
    Description: A novel processing technique for the flowfield data generated by an adaptive wall wind tunnel is presented whose basic premise is the possible undesirability of forcing such a wind tunnel to simulate free-air conditions. The concept of a 'phantom' wind tunnel is introduced for both two- and three-dimensional wind tunnels, yielding a continuous spectrum of flow fields, ranging from the original passive and ventilated configuration to a fully adaptive one. In order to implement these procedures, active control is limited to floor and ceiling surfaces.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: Journal of Aircraft (ISSN 0021-8669); 23; 158-160
    Format: text
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  • 3
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    In:  Other Sources
    Publication Date: 2011-08-19
    Description: Since its inception, adaptive wall wind tunnel design has developed three major configurational possibilities: streamlined walls, variable porosity walls, and segmented plenum arrangements. All of these methods have demonstrated their feasibility for transonic flow research; development programs are noted to be underway for three-dimensional adaptive wall tunnels. With the availability of advanced computational procedures, routine angle-of-incidence or Mach sweeps may be treated numerically, while adaptive wall wind tunnels are employed for complementary point-design and for testing at flow conditions that are beyond the capabilities of current numerical modeling.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Format: text
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  • 4
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    In:  Other Sources
    Publication Date: 2019-06-28
    Description: Adaptive-wall technology is being seriously considered for many aeronautical wind tunnel applications. A new degree of freedom is introduced into adaptive-wall wind tunnels. It is shown that the adaptive control system used to adjust wall boundary conditions may be used to select a wide variety of flow fields. These flow fields, in turn, maybe directly related to many useful unconfined or semiconfined flows. The generalized adaptive-wall concept is demonstrated for both two- and three-dimensional flows using simple analytical techniques.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: AIAA PAPER 85-0225
    Format: text
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