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  • 1
    Electronic Resource
    Electronic Resource
    Effect of soil Cd addition on germination of native plant species (1980)
    Springer
    Plant and soil 54 (1980), S. 243-247 
    Details
    ISSN: 1573-5036
    Keywords: Andropogon ; Cd ; Germination ; Greenhouse ; Monarda ; Rudbeckia ; Soil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Soil Cd addition was found to adversely affect germination ofAndropogon scoparius, Monarda fistulosa, andRudbeckia hirta. Rudbeckia germination was found to be most sensitive to soil Cd addition andAndropogon germination most tolerant (b=−.0001). Soil cadmium concentrations sufficient to reduce germination by 25% were calculated to be 30 and 46 μg Cd/g soil forRudbeckia andAndropogon respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181850
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Large space system control technology status and accomplishments (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: In the area of antenna modeling and control, preliminary structural models were defined for two representative parabolic reflectors. A control system design evolved for attitude control of the reflectors. The controller design was based on a lumped control concept where the control hardware (sensor and actuators) was mounted at the base of the antenna. In the area of distributed control, static shape control techniques were worked out to establish a prescribed vehicle shape. The corresponding estimation process for determination of vehicle shape from selected sensor measurements was also developed. A model order reduction study was conducted to find the best preflight dynamical models for on board controller design. The problems caused by truncation of the vehicle dynamics required to minimize on board computations were investigated. Estimator designs were developed for on board detection of large structure model errors.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: NASA. Langley Res. Center Large Space Systems Technol., 1979; p 323-342
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Large space system control technology overview (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The nature of the problems which confront large space structure technology controls are discussed. Emphasis is placed on the following: the basic performance requirements; structural model errors; the effect of certain disturbances (i.e., solar pressure, gravity gradient torques, and aerodynamic drag); and surface or figure control.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: NASA. Langley Res. Center Large Space Systems Technol., 1979; p 313-321
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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