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  • METEOROLOGY AND CLIMATOLOGY  (63)
  • COMPOSITE MATERIALS  (45)
  • 1980-1984  (108)
  • 1980  (108)
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  • 1980-1984  (108)
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  • 11
    facet.materialart.
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    Development of a laminate fatigue analysis (1980)
    In:  CASI
    Details
    Publikationsdatum: 2006-06-26
    Beschreibung: A fatigue analysis technique developed to predict damage growth in notched laminates is described. Features of the analysis include: criteria to relate matrix failure to cyclic stresses in and between plies; correlation of delamination growth with strain-release rate; and in-plane shear modulus change is related to cyclic shear stresses. A simplified finite element model is used to determine stresses in laminates that contain matrix damage. Failure criteria are integrated with the finite element model to form the fatigue analysis.
    Schlagwort(e): COMPOSITE MATERIALS
    Materialart: Selected NASA Res. in Composite Mater. and Struct.; p 79-106
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 12
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    Damage tolerance research on composite compression panels (1980)
    In:  CASI
    Details
    Publikationsdatum: 2006-06-26
    Beschreibung: The damage tolerance of composites was investigated. Results show that severe degradation in material strength may occur due to impact damage and that reduced strain allowables should be considered to compensate for possible impact damage. The mechanisms of failure involved in impact so that local damage will be reduced and arrest of propagating fracture initiated at impact locations are examined. Compression strength reductions for damage due to impact by a 1.27 cm diameter spherical projectile in thick laminates representative of wing skin panels are presented. Also discussed are the results of concepts recently evaluated to improve damage tolerance. These concepts range from improvements at the materials level to advanced structural configurations designed to arrest or limit the growth of propagating fractures. The results indicate that substantial improvements in the damage tolerance of graphite-epoxy composite structures can be achieved through the proper combination of materials and structural design.
    Schlagwort(e): COMPOSITE MATERIALS
    Materialart: Selected NASA Res. in Composite Mater. and Struct.; p 107-142
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 13
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    Unbekannt
    Survey of Workshops on Meteorological and Environmental Inputs to Aviation Systems (1980)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: Various aspects of aviation meteorology are discussed with respect to their relative effects on aircraft terminal operations. Existing data on turbulence and wind shear from aircraft and towers are summarized. The significance of obtaining more real time wind and temperature information is emphasized. The application and testing of various radiometer devices are also described. Airborne methods to indicate wind differences at flight altitude and at touchdown are reported.
    Schlagwort(e): METEOROLOGY AND CLIMATOLOGY
    Materialart: Proc: Fourth Ann. Workshop on Meteorol. and Environ. Inputs to Aviation Systems; p 23-39
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 14
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    Report of secondary flows, boundary layers, turbulence and wave team, report 1 (1980)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: General criteria for a flight test option are that: (1) there be a good opportunity for comparison with other measurement techniques; (2) the flow to be measured is of considerable scientific or practical interest; and (3) the airborne laser Doppler system is well suited to measure the required quantities. The requirement for comparison, i.e., ground truth, is particularly important because this is the first year of operation for the system. It is necessary to demonstrate that the system does actually measure the winds and compare the results with other methods to provide a check on the system error analysis. The uniqueness of the laser Doppler system precludes any direct comparison, but point measurements from tower mounted wind sensors and two dimensional fields obtained from radars with substantially different sampling volumes are quite useful.
    Schlagwort(e): METEOROLOGY AND CLIMATOLOGY
    Materialart: First Sci. Working Group Meeting of Airborne Doppler Lidar Wind Velocity Meas. Program; 8 p
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 15
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    Report of convective phenomena team (1980)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: A group meeting was assembled to focus on the planning of specific experiments, to establish some priorities, identify interested scientists who would like to participate, establish any special requirements, make recommendations on data processing, and to prepare flight plan outlines. Since the number of convective storms in the CCOPE (Cooperative Convective Precipitation Experiment) field experiment area are limited to only a few days during the operational time period the flight plans must be designed with a hierarchy of abort experiments so that the easily identified and lowest probability events should take priority until their quota is filled.
    Schlagwort(e): METEOROLOGY AND CLIMATOLOGY
    Materialart: First Sci. Working Group Meeting of Airborne Doppler Lidar Wind Velocity Meas. Program; 10 p
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 16
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    Application of the Doppler lidar system to agricultural burning and air-sea interactions (1980)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: The Doppler lidar system is potentially a very powerful measurement system. Three areas concerning the system are discussed: (1) error analysis of the system to verify the results; (2) application of the system to agricultural burning in California central valley; and (3) oceanographic possibilities of the system.
    Schlagwort(e): METEOROLOGY AND CLIMATOLOGY
    Materialart: NASA. Marshall Space Flight Center Exploratory Meeting on Airborne Doppler Lidar Wind Velocity Meas.; p 25
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 17
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    Measurement of phenomena associated with water clouds using Doppler lidar (1980)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: Doppler lidar measurements of phenomena associated with water clouds (such as aerosols) are discussed. The purpose of the measurements and details of executing the experiment are described.
    Schlagwort(e): METEOROLOGY AND CLIMATOLOGY
    Materialart: Exploratory Meeting on Airborne Doppler Lidar Wind Velocity Meas.; p 20-24
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 18
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    Statistical Analysis of daily mean temperatures (1980)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Data of daily mean temperatures recorded at the Kennedy Center during the period of 1957-1977 were analyzed to forecast daily mean temperatures and their thirty-day moving averages for a period of ten to fifteen days in a given month. Since it is found that the standard deviation is linear in the mean, a logarithmic transformation of the data is used for finding an integrated moving average process IMA by the Box-Jenkins aproach. The first differences of the transformed data seem to fit a moving average model with parameter value 2, MA(2). The consideration of seasonality factor makes the fit worse.
    Schlagwort(e): METEOROLOGY AND CLIMATOLOGY
    Materialart: The 1981 NASA(ASEE Summer Fac. Fellowship Program; 13 p
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 19
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    Accuracies of three computationally efficient algorithms for computing atmospheric transmittances (1980)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-17
    Beschreibung: Three algorithms for calculating polychromatic atmospheric transmittance functions have been tested using a set of eleven distinct temperature profiles in order to compare transmittance accuracies achievable by the three methods. The comparison of rms errors demonstrates that the iterative method of McMillin and Fleming (1976) is the most accurate of the efficient algorithms currently available for gases with constant mixing ratios; its accuracy approaches that of the spectroscopic parameters and the computational approximations used in the ground-truth line-by-line calculations. The method of Arking et al. (1974), while less accurate, has the advantage of being perfectly general and easily adapted to cases where spectral bandwidths are varied
    Schlagwort(e): METEOROLOGY AND CLIMATOLOGY
    Materialart: Applied Optics; 19; July 15
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 20
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    Positron annihilation studies of moisture in graphite-reinforced composites (1980)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: The positron lifetime technique of monitoring absorbed moisture is applied to several composites, including graphite/polymides which are candidates for high-temperature (over 260 C) applications. The experimental setup is a conventional fast-slow coincidence system wherein the positron lifetime is measured with respect to a reference time determined by the detection of a nuclear gamma ray emitted simultaneously with the positron. From the experiments, a rate of change of positron mean lifetime per unit mass of water can be determined for each type of specimen. Positron lifetime spectra are presented for a graphite/polyimide composite and for a pure polyimide.
    Schlagwort(e): COMPOSITE MATERIALS
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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