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  • 1995-1999  (2)
  • 1996  (2)
  • 1
    Electronic Resource
    Electronic Resource
    The habitat quality index applied to New Mexico streams (1996)
    Springer
    Hydrobiologia 319 (1996), S. 237-249 
    Details
    ISSN: 1573-5117
    Keywords: habitat models ; trout biomass ; streams ; New Mexico ; management
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The accuracy of two trout biomass (standing stock) prediction models, developed for Wyoming streams by Binns & Eiserman (1979), was evaluated for New Mexico streams inhabited by brown trout, Salmo trutta L. and rainbow trout, Oncorhynchus mykiss Walbaum. Thirty-two representative sites in 15 different streams were sampled under summer low-flow conditions in 1988 and 1989. The 11 phyiscal, chemical, and biological variables used in original models were used as independent variables for simple and multiple regression analysis designed to predict total trout biomass. Model I of Binns and Eiserman proved to be of limited utility; it explained 53% of the variation in total trout biomass at each of the New Mexico sites (kg ha−1 = 8.916 + 0.830/Model U). Only 9.5% of the biomass variations was explained by Model II. Statistical analysis showed that trout biomass was significantly correlated with nitrate-nitrogen concentration and macroinvertebrate diversity in Model I. Because both variates are time consuming to estimate, Model I may not be any more cost-effective than sampling trout directly. The low predictive power of Model II probably indicates that it is limited to the geographical area of field measurement origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00013736
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Color-based image processing to measure local temperature distributions by wide-band liquid crystal thermography (1996)
    Springer
    Flow, turbulence and combustion 56 (1996), S. 113-143 
    Details
    ISSN: 1573-1987
    Keywords: liquid crystal thermography ; color image processing ; hue-to-temperature—calibration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This study presents a color-image-processing procedure for non-intrusive local temperature measurements by thermochromic liquid crystals (TLCs). The image evaluation software is completely independent of the color detection and acquisition hardware. This allows to use a wide variety of hardware solutions. An easy reproducible calibration of camera and light source is presented. The dependence of the detected hue values on intensity is investigated and further the hueversus temperature relation is studied. Sprayable TLC formulations and TLC-coated polyester sheets are studied and compared with regard to their signal-to-noise ratio and the dependence of their hue values on illumination and viewing angle. Furthermore, a method to investigate the hue resolution is presented. The relation between the resolution of hue values and the illumination intensity and its influence on signal noise is discussed for the first time for TLC applications. Different techniques of signal noise reduction are implemented in the image processing system. Their effects on the signal noise level are discussed. As an example the two dimensional temperature distribution caused by wing-type vortex generators in a channel flow is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02249377
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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