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  • 1
    Monograph available for loan
    Monograph available for loan
    Manual on operational methods for the measurement of sediment transport (1989)
    Geneva : Secretariat of the WMO
    Associated volumes
    Details Availability
    Call number: MOP Per 800(686)
    In: WMO
    In: Operational hydrology report
    Type of Medium: Monograph available for loan
    Pages: XII, 169 S. : graph. Darst.
    ISBN: 926310686X
    Series Statement: WMO / World Meteorological Organization 686
    Location: MOP - must be ordered
    Branch Library: GFZ Library
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  • 2
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    Electron-radiation effects on the ac and dc electrical properties and unpaired electron densities of three aerospace polymers (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The effects of gigarad-level total absorbed doses from 1-MeV electrons on the post-irradiation alternating-current (ac) and direct-current (dc) electrical properties and the unpaired electron densities have been studied for Kapton, Ultem, and Mylar. The unpaired electron densities (determined from electron paramagnetic resonance spectroscopy) and the dc electrical conductivities of the irradiated materials were monitored as functions of time following the exposures to determine their decay characteristics at room temperature. The elevated-temperature ac electrical dissipations of the Ultem and Mylar were affected by the radiation. The dc conductivity of the Kapton increased by five orders of magnitude, while the dc conductivities of the Ultem and Mylar increased by less than an order of magnitude, due to the radiation. The observed radiation-generated changes in the ac electrical dissipations are explained in terms of known radiation-generated changes in the molecular structures of the three materials. A preliminary model relating the dc electrical conductivity and the unpaired electron density in the Kapton is proposed.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: IEEE Transactions on Nuclear Science (ISSN 0018-9499); NS-33; 1390-139
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Effects of postcuring on mechanical properties of pultruded fiber-reinforced epoxy composites and the neat resin (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The effects of postcuring on mechanical properties of pultruded fiber-reinforced epoxy-resin composites have been investigated. Composites with carbon, glass, and aramid reinforcement fibers were individually studied. The epoxy was a commercially-available resin that was especially developed for pultrusion fabrication. The pultrusions were conducted at 400 F with postcures at 400, 450, 500, and 550 F. Measurements of the flexural, shear, and interlaminar fracture-toughness properties showed that significant postcuring can occur during the pultrusion process. All three mechanical properties were degraded by the higher (500 and 550 F) temperatures; photomicrographs suggest that the degradation was caused at the fiber-resin interface for all three fiber types.
    Keywords: COMPOSITE MATERIALS
    Type: SAMPE Quarterly (ISSN 0036-0821); 20; 9-16
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Absorbed dose thresholds and absorbed dose rate limitations for studies of electron radiation effects on polyetherimides (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The threshold values of total absorbed dose for causing changes in tensile properties of a polyetherimide film and the limitations of the absorbed dose rate for accelerated-exposure evaluation of the effects of electron radiation in geosynchronous orbit were studied. Total absorbed doses from 1 kGy to 100 MGy and absorbed dose rates from 0.01 MGy/hr to 100 MGy/hr were investigated, where 1 Gy equals 100 rads. Total doses less than 2.5 MGy did not significantly change the tensile properties of the film whereas doses higher than 2.5 MGy significantly reduced elongation-to-failure. There was no measurable effect of the dose rate on the tensile properties for accelerated electron exposures.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TP-2928 , L-16585 , NAS 1.60:2928
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Mechanism of electrical conductivity in an irradiated polyimide (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A polyimide was exposed to 1.0 MeV electron radiation. The radiation-induced radical density and dc conductivity were measured at various post-irradiation times. The radiation-induced radical density was found to be correlated to the increased dc conductivity through a hopping model of conductivity. The post-irradiation radical species were identified.
    Keywords: NONMETALLIC MATERIALS
    Type: Journal of Physics and Chemistry of Solids (ISSN 0022-3697); 50; 7 19
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Probability distribution of wind retrieval error for the NASA scatterometer (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The NASA scatterometer (NSCAT) is a spaceborne scatterometer scheduled to be deployed in the mid-1990s. An analysis of the wind retrieval error distribution for wind estimates based on backscatter measurements made by the NSCAT instrument is presented. The results are based on an end-to-end simulation of the scatterometer instrument and data processing. In general, the distribution of the wind speed error, when normalized, is independent of the true wind speed and direction. The wind speed error can be characterized by a normal distribution. The wind direction error is independent of the true wind speed, but depends on the true wind direction. Details for wind vectors with true wind speeds from 3 m/s to 33 m/s and true wind directions from 0 to 360 deg are presented.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Results of a study on polarization mix selection for the NSCAT scatterometer (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The NASA scatterometer (NSCAT) is an instrument designed to measure the radar backscatter of the ocean's surface for estimating the near-surface wind velocity. A given resolution element is observed from several different azimuth angles. From these measurements the near-surface vector wind over the ocean may be inferred using a geophysical model function relating the normalized radar backscatter coefficient (sigma0) to the near-surface wind. The results of a study to select a polarization mix for NSCAT using an end-to-end simulation of the NSCAT scatterometer and ground processing of the sigma0 measurements into unambiguous wind fields using a median-filter-based ambiguity-removal algorithm are presented. The system simulation was used to compare the wind measurement accuracy and ambiguity removal skill over a set of realistic mesoscale wind fields for various polarization mixes. Considerations in the analysis and simulation are discussed, and a recommended polarization mix is given.
    Keywords: SPACECRAFT INSTRUMENTATION
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    A study of the relationship among wind speed, sea state, and the drag coefficient for a developing wave field (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Controlled laboratory experiments are reported which demonstrate directly and quantitatively the influence of wave conditions in determining the drag law at the air-sea interface under neutral stability conditions. It is concluded that the analytic form first proposed by Kitaigorodskii (1970) models the roughness scale very well when the sea is dominated by the locally generated waves. It is demonstrated that, by using a unified two-parameter wave spectral model by Huang et al. (1981), Kitaigorodskii's result can be shown to contain the formulas of Charnock (1955) and Hsu (1974) as special cases. The results also identify two wind and wave-related parameters as important in determining the drag coefficient for developing wave fields.
    Keywords: OCEANOGRAPHY
    Type: Journal of Geophysical Research (ISSN 0148-0227); 91; 7733-774
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Validation of Nimbus-7 cloud and SMMR data (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The relationship between cloud amount, water content (WC), and liquid water content (LWC) is studied. Nimbus-7 cloud data and LWC and WC data derived from the SMMR for July 1979 are analyzed and compared. The SMMR sea surface temperature (SST) data are also compared to Air Force SST data. The comparisons reveal that Nimbus-7 cloud data and the SMMR WC and LWC data correlate well, and there is also good agreement between the SMMR SST and the Air Force data. The data demonstrate that there is a relation between the WC, LWC, and cloud amount data.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Radar backscatter measurement accuracies using digital Doppler processors in spaceborne scatterometers (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The normalized standard deviation, Kp, of radar backscatter measurements using digital Doppler processors in spaceborne scatterometers is derived. The Kp expression for analog Doppler filter processors, such as that used in the Seasat scatterometer is shown to be a special case of the derived Kp expression. A connection to Welch's (1967) power spectrum estimation rsults is also made. Tradeoff studies in digital filter design such as hardware complexity, computational speed, and system performance can be performed based on this Kp expression. A current application in the design of the NASA scatterometer to be flown in 1990 is discussed. This derivation should be useful for system design and analysis of other radar remote-sensing instruments.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892); GE-24; 426-437
    Format: text
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    NASA TECHNICAL REPORTS
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