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  • 1
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    Stress origins and earthquake potentials in Cascadia (1989)
    In:  J. Geophys. Res., Roma, Polish Geothermal Association, vol. 94, no. 2, pp. 3076-3088, pp. L24301, (ISSN: 1340-4202)
    Details
    Publication Date: 1989
    Keywords: Stress ; Earthquake hazard ; Fault plane solution, focal mechanism ; Plate tectonics ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Cell wall elasticity: I. A critique of the bulk elastic modulus approach and an analysis using polymer elastic principles (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The traditional bulk elastic modulus approach to plant cell pressure-volume relations is inconsistent with its definition. The relationship between the bulk modulus and Young's modulus that forms the basis of their usual application to cell pressure-volume properties is demonstrated to be physically meaningless. The bulk modulus describes stress/strain relations of solid, homogeneous bodies undergoing small deformations, whereas the plant cell is best described as a thin-shelled, fluid-filled structure with a polymer base. Because cell walls possess a polymer structure, an alternative method of mechanical analysis is presented using polymer elasticity principles. This initial study presents the groundwork of polymer mechanics as would be applied to cell walls and discusses how the matrix and microfibrillar network induce nonlinear stress/strain relationships in the cell wall in response to turgor pressure. In subsequent studies, these concepts will be expanded to include anisotropic expansion as regulated by the microfibrillar network.
    Keywords: Life Sciences (General)
    Type: Plant, cell & environment (ISSN 0140-7791); Volume 8; 8; 563-70
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Impatience versus achievement strivings in the Type A pattern: Differential effects on students' health and academic achievement (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Psychometric analyses of college students' responses to the Jenkins Activity Survey, a self-report measure of the Type A behavior pattern, revealed the presence of two relatively independent factors. Based on these analyses, two scales, labeled Achievement Strivings (AS) and Impatience and Irritability (II), were developed. In two samples of male and female college students, scores on AS but not on II were found to be significantly correlated with grade point average. Responses to a health survey, on the other hand, indicated that frequency of physical complaints was significantly correlated with II but not with AS. These results suggest that there are two relatively independent factors in the Type A pattern that have differential effects on performance and health. Future research on the personality factors related to coronary heart disease and other disorders might more profitably focus on the syndrome reflected in the II scale than on the Type A pattern.
    Keywords: BEHAVIORAL SCIENCES
    Type: NASA-CR-180693 , NAS 1.26:180693
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Making it without losing it: Type A, achievement motivation, and scientific attainment revisited (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: In a study by Matthews et al. (1980), responses by academic psychologists to the Jenkins Activity Survey for Health Prediction, a measure of the Type A construct, were found to be significantly, positively correlated with two measures of attainment, citations by others to published work and number of publications. In the present study, JAS responses from the Matthews et al. sample were subjected to a factor analysis with oblique rotation and two new subscales were developed on the basis of this analysis. The first, Achievement Strivings (AS) was found to be significantly correlated with both the publication and citation measures. The second scale, Impatience and Irritability (I/I), was uncorrelated with the achievement criteria. Data from other samples indicate that I/I is related to a number of health symptoms. The results suggest that the current formulation of the Type A construct may contain two components, one associated with positive achievement and the other with poor health.
    Keywords: BEHAVIORAL SCIENCES
    Type: NASA-CR-180321 , NAS 1.26:180321
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Application of intersatellite links to domestic satellite systems (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The results of a study on intersatellite link (ISL) applications for domestic satellite communications are presented. It was determined if any technical, economic, or performance benefits could be gained by introducing intersatellite links into a domestic satellite communication network. Several key systems issues of domestic ISL's are addressed. These include the effect of a skewed traffic distribution on the selection of ISL satellite orbit locations, tolerable satellite spacing, and crosslink traffic-handling requirements. An ISL technology assessment is made by performing a parametric link analysis for several microwave and optical implementations. The impact of the crosslink on the end-to-end link performance is investigated for both regenerative and nonregenerative ISL architectures. A comparison is made between single satellite systems operating at C-, and Ku-bands and the corresponding ISL systems in terms of ground segment cost, space segment cost, and net link performance. Results indicate that ISL's can effectively expand the CONUS orbital arc, with a 60 GHz ISL implementation being the most attractive.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: AIAA PAPER 86-0604
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    The average configuration of the induced Venus magnetotail (1987)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The interaction of the solar-wind flow with Venus is discussed as well as the morphology of magnetic-field-line draping in the Venus magnetotail. Emphasis is placed on the importance of the interplanetary magnetic field X-component in controlling the configuration of field draping in this induced magnetotail. The average magnetic configuration of this magnetotail is studied. A connection is made between the derived consistent plasma flow speed and density and the observational energy/charge range and sensitivity of the Pioneer Venus Orbiter plasma analyzer.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Auroral zone field-aligned currents observed in the magnetotail and at intermediate altitudes - An ISEE perspective (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The relationship between low-altitude auroral-zone field-aligned currents and the geomagnetic tail is investigated on the basis of a statistical analysis of ISEE and DE observations. The data are compiled in diagrams and graphs and characterized in detail. It is shown that the large-scale current systems of low-altitude regions 1 and 2 are only reduplicated in 27 percent of the observations at 2-7 earth radii (those associated with the onset of a substorm expansion), while the flow at the plasma-sheet boundary opposes the region 1 polarity (the highest-latitude near-midnight currents being directed earthward).
    Keywords: GEOPHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Numerical arc segmentation algorithm for a radio conference: A software tool for communication satellite systems planning (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Numerical Arc Segmentation Algorithm for a Radio Conference (NASARC) provides a method of generating predetermined arc segments for use in the development of an allotment planning procedure to be carried out at the 1988 World Administrative Radio Conference (WARC) on the Use of the Geostationary Satellite Orbit and the Planning of Space Services Utilizing It. Through careful selection of the predetermined arc (PDA) for each administration, flexibility can be increased in terms of choice of system technical characteristics and specific orbit location while reducing the need for coordination among administrations. The NASARC software determines pairwise compatibility between all possible service areas at discrete arc locations. NASARC then exhaustively enumerates groups of administrations whose satellites can be closely located in orbit, and finds the arc segment over which each such compatible group exists. From the set of all possible compatible groupings, groups and their associated arc segments are selected using a heuristic procedure such that a PDA is identified for each administration. Various aspects of the NASARC concept and how the software accomplishes specific features of allotment planning are discussed.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: NASA-TM-100789 , E-3962 , NAS 1.15:100789 , AIAA PAPER 88-0788
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Added noise due to the effect of an upstream wake on a propeller (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An analytical/computational study has been conducted to predict the effect of an upstream wing or pylon on the noise of an operating propeller. The wing trailing edge was placed at variable distances (0.1 and 0.3 chord) upstream of a scaled model propeller (SR-2). The wake was modeled using a similarity formulation. The instantaneous pressure distribution on the propeller blades during the passage through the wake was formulated in terms of a time-dependent variation of each blade section's angle of attack and in terms of the shed vortices from the blade trailing edge. It was found that the final expressions for the unsteady loads considerably altered the radiated noise pattern. Predicted noise for various observer positions, rotational speeds, and propeller/pylon distances were computed and are presented in terms of the pressure time history, harmonics of the Fourier analysis, and overall sound pressure levels (OASPL). The addition of the tangential stress due to skin friction was found to have a damping effect on the acoustic pressure time history and the resulting spectrum of the generated noise. It is shown that the positioning of a pylon upstream of a propeller indeed increases the overall noise.
    Keywords: ACOUSTICS
    Type: AIAA PAPER 87-2720
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Comparison of two transonic noise prediction formulations using the aircraft noise prediction program (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This paper addresses recently completed work on using Farassat's Formulation 3 noise prediction code with the Aircraft Noise Prediction Program (ANOPP). Software was written to link aerodynamic loading generated by the Propeller Loading (PLD) module within ANOPP with formulation 3. Included are results of comparisons between Formulation 3 with ANOPP's existing noise prediction modules, Subsonic Propeller Noise (SPN) and Transonic Propeller Noise (TPN). Four case studies are investigated. Results of the comparison studies show excellent agreement for the subsonic cases. Differences found in the comparisons made under transonic conditions are strictly numerical and can be explained by the way in which the time derivative is calculated in Formulation 3. Also included is a section on how to execute Formulation 3 with ANOPP.
    Keywords: ACOUSTICS
    Type: NASA-CR-181609 , NAS 1.26:181609
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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