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  • COMPOSITE MATERIALS  (3)
  • Cyclodextrin  (1)
  • Distance matrices  (1)
  • 1
    Electronic Resource
    Electronic Resource
    An empirical comparison of distance matrix techniques for estimating codon usage divergence (1994)
    Springer
    Journal of molecular evolution 39 (1994), S. 533-536 
    Details
    ISSN: 1432-1432
    Keywords: Codon usage ; Phylogeny ; Distance matrices ; Ordination ; Clustering ; Apicomplexa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The quantitative description of codon usage divergence among taxa is a two-step process involving first the calculation of a standardized measure of intertaxon divergence for each possible pair of taxa followed by a summary and visual display of the patterns among the taxa inherent in these measures. Three different measures have been proposed in the literature, and three different summaries have been used. These different techniques are empirically compared using a data set consisting of gene sequences from seven species of Apicomplexa. The results suggest that the manhattan distance measure may be preferable to the use of the chisquare measure, although the separation of amino acid usage and codon usage by the genetic distance produces theoretical advantages. The multidimensional scaling ordination and unweighted pair-group clustering are both successful in displaying the patterns, while the eigenanalysis ordination is not.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00173423
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Determination of geosmin in water by enantioselective gas chromatography (1991)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 14 (1991), S. 704-707 
    Details
    ISSN: 0935-6304
    Keywords: Enantioselective gas chromatography ; Cyclodextrin ; Geosmin ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240141017
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    Paper (German National Licenses)
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  • 3
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    A viscoplastic constitutive theory for metal matrix composites at high temperature (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A viscoplastic constitutive theory is presented for representing the high temperature deformation behavior of metal matrix composites. The point of view taken is a continuum one where the composite is considered a material in its own right, with its own properties that can be determined for the composite as a whole. It is assumed that a single preferential (fiber) direction is identifiable at each material point (continuum element) admitting the idealization of local transverse isotropy. A key ingredient is the specification of an experimental program for the complete determination of the material functions and parameters for characterizing a particular metal matrix composite. The parameters relating to the strength of anisotropy can be determined through tension/torsion tests on longitudinally and circumferentially reinforced thin walled tubes. Fundamental aspects of the theory are explored through a geometric interpretation of some basic features analogous to those of the classical theory of plasticity.
    Keywords: COMPOSITE MATERIALS
    Type: NASA. Lewis Research Center, Nonlinear Constitutive Relations for High Temperature Applications, 1986; p 7-25
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    A study of elevated temperature testing techniques for the fatigue behavior of PMCS: Application to T650-35/AMB21 (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An experimental study was conducted to investigate the mechanical behavior of a T650-35/AMB21 eight-harness satin weave polymer composite system. Emphasis was placed on the development and refinement of techniques used in elevated temperature uniaxial PMC testing. Issues such as specimen design, gripping, strain measurement, and temperature control and measurement were addressed. Quasi-static tensile and fatigue properties (R(sub sigma) = 0.1) were examined at room and elevated temperatures. Stiffness degradation and strain accumulation during fatigue cycling were recorded to monitor damage progression and provide insight for future analytical modeling efforts. Accomplishments included an untabbed dog-bone specimen design which consistently failed in the gage section, accurate temperature control and assessment, and continuous in-situ strain measurement capability during fatigue loading at elevated temperatures. Finally, strain accumulation and stiffness degradation during fatigue cycling appeared to be good indicators of damage progression.
    Keywords: COMPOSITE MATERIALS
    Type: NASA-TM-106927 , E-9648 , NAS 1.15:106927
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Thermomechanical testing of high-temperature composites - Thermomechanical fatigue (TMF) behavior of SiC(SCS-6)/Ti-15-3 (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Thermomechanical testing techniques recently developed for monolithic structural alloys were successfully extended to continuous fiber reinforced composite materials in plate form. The success of this adaptation was verified on a model metal matrix composite (MMC) material, namely SiC(SCS-6)/Ti-15V-3Cr-3Al-3Sn. Effects of heating system type and specimen preparation are also addressed. Cyclic lives determined under full thermomechanical conditions were shown to be significantly reduced from those obtained under comparable isothermal and in-phase bi-thermal conditions. Fractography and metallography from specimens subjected to isothermal, out-of-phase and in-phase conditions reveal distinct differences in damage-failure modes. Isothermal metallography revealed extensive matrix cracking associated with fiber damage throughout the entire cross-section of the specimen. Out-of-phase metallography revealed extensive matrix damage associated with minimal (if any) fiber cracking. However, the damage was located exclusively at surface and near-surface locations. In-phase conditions produced extensive fiber cracking throughout the entire cross-section, associated with minimal (if any) matrix damage.
    Keywords: COMPOSITE MATERIALS
    Type: Conference on Composite Materials: Testing and Design; Apr 24, 1990 - Apr 25, 1990; San Francisco, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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