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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Kyklos 36 (1983), S. 0 
    ISSN: 1467-6435
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Sociology , Economics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Industrial & engineering chemistry 10 (1918), S. 160-160 
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Industrial & engineering chemistry 10 (1918), S. 160-160 
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 42 (1920), S. 2355-2366 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract An evaluation of the influences of acidic deposition and forest development on nutrient cycling and conifer productivity at the Charles Lathrop Pack Demonstration Forest, near Warrensburg, New York, was made. This site has a known land use history and is the source of 60 years of soils and silviculture research. Soils were characterized by a nutritional imbalance and support conifer plantations that exhibited declining growth. Historical and contemporary evaluations of nutrient cycling in 47- to 57-yr-old red pine plantations provided no evidence that acidic deposition has had an adverse influence on nutrient cycling. Ap horizon pH decreased from 1949 to 1962 but remained the same from 1962 to 1985. In the B horizon, pH was stable from 1962 to 1985. Exchangeable potassium levels in the Ap horizon fluctuated but did not significantly change from 1949 to 1985: in the B horizon it increased during the period 1962 to 1985. Levels of potassium in the foliage of red pine in unfertilized plots increased from 1949 to 1985, paralleling increases in B horizon potassium levels during that period. There was no increase in cation leaching from the mineral soil that could be attributed to anthropogenic inputs of NO3 − and SO4 2− due to retention of N and S in this ecosystem. Soil solution K+ chemistry was similar between the 1960's and the 1980's. Mineral soil pH and base cation status were differentially influenced by tree species since 1930. In general, temporal and contemporary trends of mineral soil pH and base cation status of the soil and foliage indicated that forest development has been the dominant factor influencing nutrient cycling in these conifer plantations. While results of these studies do not conclusively preclude involvement of acidic deposition effects as part of a forest decline syndrome, they indicate the importance of recognizing and measuring natural variability in forest soil processes due to differential species effects and forest aggradation. Because these effects may have a greater impact on stand productivity than the effects of acidic deposition, they can confound interpretation of acidic deposition research if not clearly understood.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Water, air & soil pollution 48 (1989), S. v 
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
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  • 7
    facet.materialart.
    Unknown
    In:  CASI
    Publication Date: 2019-07-10
    Description: The development of the International Space Station is critically dependent upon development and testing of materials that will require exposure to the space environment. The seals between the modules are one of the more important examples. The choice of seals depends upon the seal materials' susceptibility to atomic oxygen, UV radiation, and the combined external space environment. Also, the choice of thermal control materials depends on their susceptibility to the space environment. The Space Environmental Branch at MSFC developed a flight experiment to provide information on the effects of the space environment on seal and thermal control materials. The experiment, called the Passive Optical Sample Array (POSA), involved exposing several different material samples to the atomic oxygen, UV radiation, and combined effects of the space environment. The POSA experiment is currently flying on the Russian Mir space station. It was necessary during the assembly of POSA to develop an understanding of available fabrication and metrology techniques in order to develop several monitoring systems for the experiment. The report briefly describes the tasks and the work performed in preparing the samples for the POSA experiment.
    Keywords: Mechanical Engineering
    Type: NASA-CR-202796 , NAS 1.26:202796 , UAH-4
    Format: application/pdf
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