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  • 1
    Electronic Resource
    Electronic Resource
    Growth rates in diameter, basal area, and height of Pilgerodendron uviferum; relationship between growth index and germination (1992)
    Springer
    Trees 6 (1992), S. 199-203 
    Details
    ISSN: 1432-2285
    Keywords: Dendrochronology ; Growth rate ; Pilgerodendron uviferum ; Chile
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Increment borer samples taken at breast height in Pilgerodendron uviferum (Cupressaceae) trees growing in two Chilean forest stands near latitude 42° south were used to study growth rates in diameter, basal area, and height. Radial average growth is 0.51 mm/year in Santa Luciă 0.44 mm/year in the Piuchué stand; the correlation between diameter and age is 0.79 in Santa Lucía and 0.64 in Piuchué. Similar results were obtained in the basal area/age relationship. Both groups of trees have a low rate of growth compared to rates obtained in other studies. Maximum values for radial growth (culmination age) are reached at 110 years of age in Santa Lucia and 50 years in Piuchue. Growth in height, averaging 5.8 cm/year, appears to be similar in all trees analyzed; occasional differences can be attributed to understory position of some trees. Comparison of radial growth and germination of Pilgerodendron plants shows a synchronous relationship, suggesting an influence of climate on the pattern of forest regeneration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224336
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    Paper (German National Licenses)
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  • 2
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    Laser Image Contrast Enhancement System (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: An optical image enhancement system provides improved image contrast in imaging of a target in high temperature surroundings such as a furnace. The optical system includes a source of vertically polarized light such as laser and a beam splitter for receiving the light and directing the light toward the target. A retardation plate is affixed to a target-facing surface of the beam splitter and a vertical polarizer is disposed along a common optical path with the beam splitter between the retardation plate and the target. A horizontal polarizer disposed in the common optical path, receives light passing through a surface of the beam splitter opposed to the target-facing surface. An image detector is disposed at one end of the optical path. A band pass filter having a band pass filter characteristic matching the frequency of the vertically polarized light source is disposed in the path between the horizontal polarizer and the image detector. The use of circular polarization, together with cross polarizers, enables the reflected light to be passed to the detector while blocking thermal radiation.
    Keywords: Lasers and Masers
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Enhanced-Contrast Viewing of White-Hot Objects in Furnaces (2006)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: An apparatus denoted a laser image contrast enhancement system (LICES) increases the contrast with which one can view a target glowing with blackbody radiation (a white-hot object) against a background of blackbody radiation in a furnace at a temperature as high as approximately 1,500 C. The apparatus utilizes a combination of narrowband illumination, along with band-pass filtering and polarization filtering to pass illumination reflected by the target while suppressing blackbody light from both the object and its background.
    Keywords: Lasers and Masers
    Type: MFS-31561-1 , NASA Tech Briefs, January 2006; 25-26
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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