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  • 1
    Electronic Resource
    Electronic Resource
    Maternal, paternal, additive, and dominance components of variance in Gerbera (1991)
    Springer
    Theoretical and applied genetics 82 (1991), S. 756-760 
    Details
    ISSN: 1432-2242
    Keywords: Heritability ; Extranuclear ; Inheritance ; Reciprocal ; Covariance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Estimates of additive, dominance, maternal, and paternal components of variance were obtained for a sample of 18 traits, including measurements of yield, scapes, flowers, disk, ray and trans florets, leaves, and branching in the Davis population of Gerbera hybrida. The results, based on the covariance of reciprocals, indicate that although heritability averaged 0.52, extranuclear maternal or paternal effects are not important sources of variability. Therefore, reciprocal differences do not seriously affect estimates of additive variance or heritability in this population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227321
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Quantitative analysis of correlations among flower traits in Gerbera hybrida Compositae (1990)
    Springer
    Theoretical and applied genetics 80 (1990), S. 552-558 
    Details
    ISSN: 1432-2242
    Keywords: Genetic correlation ; Heritability ; Hidden genetic correlation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Phenotypic (r p ), genetic (r g ), and environmental, (r e ) correlations were estimated for 38 flower traits in the Davis population of gerbera (Gerbera hybrida, Compositae). Fifty-two percent of r p and 38% of r g were statistically significant at P 〈 0.05. Significant negative r p were infrequent, but significant negative r g occurred in 10% of cases. There was a negative correlation between estimates of r g and r e , resulting in cases where r g was significant, but r p was not. Individual traits varied in their tendency to correlate phenotypically or genetically, and positively or negatively, with other traits. Traits within the same morphological category, such as disk florets or transitional florets, were more highly intercorrelated than were traits from different categories.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226759
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  • 3
    Electronic Resource
    Electronic Resource
    Quantitative analysis of correlations among flower traits in Gerbera hybrida, Compositae. III. Genetic variability and structure of principal component traits (1998)
    Springer
    Theoretical and applied genetics 97 (1998), S. 316-322 
    Details
    ISSN: 1432-2242
    Keywords: Key words Principal component analysis ; Genetic correlation ; Heritability ; Selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  A sample of 36 flower traits consisting of six morphological categories in the Davis population of gerbera was restructured into phenotypic and genetic principal component traits. The first 5 phenotypic principal component traits accounted for 62% of the total phenotypic variance of the 36 traits and have moderate to high heritablities. The first 5 genetic principal component traits account for 97% of total genetic variance and all have high heritability. Morphological structure of these component traits suggest an underlying process identified by the first genetic principal component involving largely trans and disk floret traits. The results of this study indicate that the quantitative genetic structure of the gerbera flower is controlled by a few independent components and that principal component analysis is a useful tool to reveal variation in this structure. These composite traits are heritable and are expected to respond to selection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050901
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  • 4
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    Coupled structural/thermal/electromagnetic analysis/tailoring of graded composite structures (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Described here are the accomplishments of a 5-year program to develop a methodology for coupled structural, thermal, electromagnetic analysis tailoring of graded component structures. The capabilities developed over the course of the program are the analyzer module and the tailoring module for the modeling of graded materials. Highlighted accomplishments for the past year include the addition of a buckling analysis capability, the addition of mode shape slope calculation for flutter analysis, verification of the analysis modules using simulated components, and verification of the tailoring module.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-189153 , NAS 1.26:189153
    Format: application/pdf
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  • 5
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    Application of HOST technology to the SSME HPFTP blade (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The development of turbine blade analysis tools as they moved from research contracts under the NASA HOST (Hot Section Technology) program to a PC-based system for preliminary design and to use in evaluating the SSME HPFTP (Space Shuttle Main Engine High Pressure Fuel Turbo Pump) blade is discussed. The heat transfer and structural analysis of the blade, the development of a data base for constitutive modeling of the blade materials, including coatings, and the use of advanced nonlinear finite element methods are addressed.
    Keywords: STRUCTURAL MECHANICS
    Type: ASME PAPER 89-GT-130
    Format: text
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  • 6
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    Coupled structural/thermal/electromagnetic analysis/tailoring of graded composite structures (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Accomplishments are described for the fourth years effort of a 5-year program to develop a methodology for coupled structural/thermal/electromagnetic analysis/tailoring of graded component structures. These accomplishments include: (1) demonstration of coupled solution capability; (2) alternate CSTEM electromagnetic technology; (3) CSTEM acoustic capability; (4) CSTEM tailoring; (5) CSTEM composite micromechanics using ICAN; and (6) multiple layer elements in CSTEM.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-189152 , NAS 1.26:189152
    Format: application/pdf
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  • 7
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    Coupled structural/thermal/electromagnetic analysis/tailoring of graded composite structures (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Accomplishments are described for the third years effort of a 5-year program to develop a methodology for coupled structural/thermal/electromagnetic analysis/tailoring of graded composite structures. These accomplishments include: (1) structural analysis capability specialized for graded composite structures including large deformation and deformation position eigenanalysis technologies; (2) a thermal analyzer specialized for graded composite structures; (3) absorption of electromagnetic waves by graded composite structures; and (4) coupled structural thermal/electromagnetic analysis of graded composite structures.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-189151 , NAS 1.26:189151
    Format: application/pdf
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  • 8
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    Coupled structural/thermal/electromagnetic analysis/tailoring of graded composite structures (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Accomplishments are described for the first year effort of a 5-year program to develop a methodology for coupled structural/thermal/electromagnetic analysis/tailoring of graded composite structures. These accomplishments include: (1) the results of the selective literature survey; (2) 8-, 16-, and 20-noded isoparametric plate and shell elements; (3) large deformation structural analysis; (4) eigenanalysis; (5) anisotropic heat transfer analysis; and (6) anisotropic electromagnetic analysis.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-189150 , NAS 1.26:189150
    Format: application/pdf
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  • 9
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    On 3D inelastic analysis methods for hot section components (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Accomplishments are described for the 2-year program, to develop advanced 3-D inelastic structural stress analysis methods and solution strategies for more accurate and cost effective analysis of combustors, turbine blades and vanes. The approach was to develop a matrix of formulation elements and constitutive models. Three constitutive models were developed in conjunction with optimized iterating techniques, accelerators, and convergence criteria within a framework of dynamic time incrementing. Three formulations models were developed; an eight-noded mid-surface shell element, a nine-noded mid-surface shell element and a twenty-noded isoparametric solid element. A separate computer program was developed for each combination of constitutive model-formulation model. Each program provides a functional stand alone capability for performing cyclic nonlinear structural analysis. In addition, the analysis capabilities incorporated into each program can be abstracted in subroutine form for incorporation into other codes or to form new combinations.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA, Lewis Research Center, Turbine Engine Hot Section Technology 1986; p 257-268
    Format: application/pdf
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  • 10
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    3D inelastic analysis methods for hot section components (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The objective is to develop analytical tools capable of economically evaluating the cyclic time dependent plasticity which occurs in hot section engine components in areas of strain concentration resulting from the combination of both mechanical and thermal stresses. Three models were developed. A simple model performs time dependent inelastic analysis using the power law creep equation. The second model is the classical model of Professors Walter Haisler and David Allen of Texas A and M University. The third model is the unified model of Bodner, Partom, et al. All models were customized for linear variation of loads and temperatures with all material properties and constitutive models being temperature dependent.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Lewis Research Center, Turbine Engine Hot Section Technology, 1985; p 227-237
    Format: application/pdf
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