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  • 1
    Electronic Resource
    Electronic Resource
    Contribution of the Western Australian wheatbelt termite,Drepanotermes tamminensis (Hill), to the soil nutrient budget (1994)
    Springer
    Ecological research 9 (1994), S. 351-356 
    Details
    ISSN: 1440-1703
    Keywords: Drepanotermes tamminensis ; isoptera ; soil nutrients ; termite
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The role of soil modification by the mound-building termite,Drepanotermes tamminensis (Hill), was studied during 1991 in the Durokoppin Nature Reserve, Western Australia. Soil chemical parameters were quantified for ‘soils’ in nests and for surrounding soil in both a Wandoo (Eucalyptus capillosa) woodland and a Casuarina (Allocasuarina campestris) shrubland plot. All ‘soils’ in nests were more acidic than the surrounding soil within each study plot. Generally, nutrient levels in the nested soils were higher than the un-nested soil within each study plot and were also higher in the woodland than in the shrubland plot. Depending on the nuttient concerned, the nested soil contained between 0.3 and 21.9% of the total nutrient load per hectare within each study plot. The quantities of nutrients per hectare in termite mounds were higher in the woodland than in the shrubland plot. It is concluded that mounds of this species of termite form a significant bank of nutrients, although time for release of such nutrients depends on the degree of erosion and on the longevity of mounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02348422
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of vegetation and soil types on the wheatbelt termite,Drepanotermes tamminensis (Hill), in the Western Australian wheatbelt (1994)
    Springer
    Ecological research 9 (1994), S. 151-158 
    Details
    ISSN: 1440-1703
    Keywords: Drepanotermes tamminensis ; habitat ; Isoptera ; soil type ; termite ; vegetation type
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A survey of the distribution and density of mounds of the harvester termite,Drepanotermes tamminensis (Hill), was carried out in the Durokoppin Nature Reserve, Western Australia in 1990. Vegetation and, to a lesser extent, soil type, appear to be important factors in determining density and distribution of termite mounds within the Reserve. A more detailed study of mounds in Wandoo (Eucalyptus capillosa) woodland and Casuarina (Allocasuarina campestris) shrubland indicated that the total number and size of mounds were significantly higher in the woodland than in the shrubland. The total wet weight biomass ofD. tamminensis was calculated as 3.74 gm−2 (37.4 kg ha−1) in the woodland and 1.69 gm−2 (16.9 kg ha−1) in the shrubland. Thus, of the two favored habitats, Wandoo woodland appears to be more optimal for this termite species than the Casuarina shrubland.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02347490
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Harvesting rate of the termite,Drepanotermes tamminensis (Hill) within native woodland and shrubland of the Western Australian wheatbelt (1993)
    Springer
    Ecological research 8 (1993), S. 269-275 
    Details
    ISSN: 1440-1703
    Keywords: Drepanotermes tamminensis ; harvesting rate ; Isoptera ; termite
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Western Australian termite,Drepanotermes tamminensis (Hill), harvests various plant materials according to biomass availability. The main litter components harvested by this termite in a woodland dominated byEucalyptus capillosa are bark and leaves of the major tree species, while in shrubland dominated byAllocasuarina campestris, shoots of this species are taken. Harvesting mainly occurs during the autumn (April–May) and spring (September–October) seasons. The commencement and duration of harvesting appears to depend partly on weather conditions, with harvesting taking place at temperatures between 15 and 25°C after periods of rain. This species of termite harvests approximately 15.6 g m−2 year−1 and 3.2 g m2 year−1 (dry weight of plant material) in the woodland and shrubland, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02347186
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  • 4
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    Instantaneous velocity field measurement of objects in coaxial rotation using digital image velocimetry (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The instantaneous velocity fields of time-dependent flows, or of a collection of objects moving with spatially varying velocities, can be measured by means of digital image velocimetry (DIV). DIV overcomes several shortcomings of such existing techniques as laser-speckle or particle-image velocimetry. Attention is presently given to numerically generated images representing objects in uniform motion which are then used for the experimental validation of DIV.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ; : Mechanical behavio
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Nimbus 7 SBUV/TOMS calibration for the ozone measurement (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The Solar Backscatter Ultraviolet and Total Ozone Mapping Spectrometer (SBUV/TOMS) onboard the Nimbus 7 satellite is an atmospheric ozone measuring experiment from solar backscattered ultraviolet radiation off the earth atmosphere. The excellent spatial coverage and long lifetime of SUBV/TOMS makes this experiment viable for the long term monitoring of the global ozone. A technique used in the in-orbit calibration of SUBV/TOMS for the ozone data processing is presented. This technique employs a model to explain and correct the observed instrument output due to degradation. From the analyses with the corrected data to verify the model, it is concluded that the in-orbit instrument calibration for the ozone measurement is accurate within 2 percent for the first four years of the instrument operation.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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  • 6
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    Imaging antenna array at 119 microns (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A focal-plane imaging antenna array has been demonstrated at 119 microns. The array is a line of evaporated silver bow-tie antennas with bismuth microbolometer detectors on a silicon substrate. Radiation is coupled into the array by a lens placed on the back of the substrate. The bolometers are thermally isolated from the silicon substrate with a half-micron layer of polyimide. The array performance is demonstrated by coherent imaging of a series of holes at half the diffraction-limited cut-off frequency.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Physics Letters; 41; Aug. 15
    Format: text
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    NASA TECHNICAL REPORTS
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