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  • 1
    Electronic Resource
    Electronic Resource
    Corollin, coronillin and coronarian: Three new 3-nitropropanoyl-d-glucopyranoses from Coronilla varia
    Amsterdam : Elsevier
    Phytochemistry 16 (1977), S. 375-377 
    Details
    ISSN: 0031-9422
    Keywords: 3-nitropropanoyl-D-glucopyranoses. ; Coronilla varia ; Leguminosae ; aliphatic nitro compounds ; crownvetch
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9422(77)80068-X
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Esterification of 3-nitropropanoic acid to glucose by suspension cultures of Coronilla varia
    Amsterdam : Elsevier
    Phytochemistry 26 (1986), S. 139-140 
    Details
    ISSN: 0031-9422
    Keywords: Coronilla varia ; Leguminosae ; aliphatic nitro compounds. ; crownvetch ; suspension culture
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0031-9422(00)81497-1
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Regeneration of Coronilla varia L. (crownvetch) plants from callus culture (1984)
    Springer
    Plant cell, tissue and organ culture 3 (1984), S. 143-148 
    Details
    ISSN: 1573-5044
    Keywords: Coronilla varia ; callus tissue culture ; somatic embryogenesis ; regeneration of plants ; ammonium ion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Coronilla varia L. (crownvetch) plants were regenerated from callus cultures through somatic embryogenesis. Callus cultures were initiated using hypocotyls excised from sterile seedlings. Cultures were then transferred from a modified Gamborg's B5 medium containing 2,4-D to a medium containing no plant growth regulators (basal B5). Formation of embryos was evident in 12 of 32 callus lines after transfer of callus to BOi2Y (modified Blaydeś medium supplemented with 100 mg inositol and 2 g yeast extract/L). Basal B5 supplemented with 10 mM asparagine or 20 mM NH4Cl could be substituted for BOi2Y. Embryos subsequently transferred to basal B5 developed roots and shoots. Plants thus formed were first transferred to vermiculite and then to soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033735
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  • 4
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    On the solution of problems involving impact type loading (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The response of beam and plate members to pulse and impact loading is investigated, and numerical methods are analyzed and compared. The equations of motion, the finite difference and finite element methods, the time integration/Runge-Kutta techniques, and material modeling are discussed in detail. It is found that both the finite difference and the finite element methods could be accurately employed to discretize the spatial variation in the displacements. Central differences or a fourth order Runge-Kutta algorithm could be used for the time integration. The total energy of the system would give the stability and accuracy of the solution. Results showed that the finite element method provided better efficiency in obtaining accurate solution than the finite difference method when a scalar processor is used. However, the finite difference method was more efficient on the vector processor. Therefore, the most efficient method of solution depends on the type of computer present for the analysis.
    Keywords: STRUCTURAL MECHANICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Response of composite plates subjected to acoustic loading (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The objectives of the project were to investigate numerical methodology for the determination of narrowband response in the geometrically nonlinear regime, to determine response characteristics for geometrically nonlinear plates subjected to random loading and to compare the predictions with experiments to be performed at NASA-Langley. The first two objectives were met. The response of composite plates subjected to both narrowband and broadband excitation were studied and the results are presented and discussed.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-184618 , NAS 1.26:184618
    Format: application/pdf
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  • 6
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    Biaxial load effects in the mechanics of fracture (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Experimental findings on the effects of biaxial loading on fracture toughness, non-self-similar growth problems, fatigue crack propagation, and subcritical growth properties are reviewed, together with the fundamental analytical solutions for problems of crack in an elastic solid under biaxial loading. Basic asymptotic field representations, and some stress-intensity factor solutions are presented. The effects of biaxial loading on problems involving plastic deformation are illustrated with recent numerical results. Early asymptotic solutions for a nonlinear elastic solid are discussed with emphasis on the solution of problems with significant plastic deformation, and on stable crack growth. A brief survey of the applications literature, and recommendations for future studies are included.
    Keywords: STRUCTURAL MECHANICS
    Type: Aeronautical Society of India, Journal (ISSN 0001-9267); 36; 221-236
    Format: text
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  • 7
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    Vibration response of geometrically nonlinear elastic beams subjected to pulse and impact loading (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An understanding of the response of composite laminates to foreign object impact is of fundamental importance to the design and the accurate evaluation of aircraft and aerospace structures. A characterization of the basic deformation response of the system is needed for the accurate and consistent modeling of the damage caused by the impact. The response to low velocity impact of foreign objects (less than 10 m/sec at 10 J of impact energy or less) is of particular interest because it corresponds to tool drop problems. An investigation of the vibration response of a simple square beam was conducted, taking into account both sharp initial velocity pulse conditions and simulated impact conditions. Attention is given to nonlinear beam theory, boundary conditions and materials modeling, initial conditions and impact modeling, and a solution of the obtained system of partial differential equations by the finite difference approach.
    Keywords: STRUCTURAL MECHANICS
    Type: Computers and Structures (ISSN 0045-7949); 20; 4 19
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Vibration characteristics of the HPOTP (High Pressure Oxygen Turbopump) of the SSME (Space Shuttle Main Engine) (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A review is presented of various rotordynamic problems which have been encountered and eliminated in developing the current flight engines, and continuing subsynchronous problems which are being encountered in developing a 109% power level engine. The basic model for the High Pressure Oxygen Turbopump (HPOTP) of the SSME including the structural dynamic model for the rotor and housing and component models for the liquid and gas seals, turbine-clearance excitation forces, and impeller-diffuser forces are discussed. Results from a linear model are used to examine the synchronous response and stability characteristics of the HPOTP, examining bearing load and stability problems associated with the second critical speed. Various seal modifications are examined and shown to have favorable consequences with respect to bearing reactions and stability.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Marshall Space Flight Center Advan. High Pressure O2(H2 Technol; p 452-481
    Format: application/pdf
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  • 9
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    Energy conservation in the transient response of nonlinear beam vibration problems subjected to pulse loading - A numerical approach (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The nonlinear vibration response of a double cantilevered beam subjected to pulse loading over a central sector is studied. The initial response is generated in detail to ascertain the energetics of the response. The total energy is used as a gauge of the stability and accuracy of the solution. It is shown that to obtain accurate and stable initial solutions an extremely high spatial and time resolution is required. This requirement was only evident through an examination of the energy of the system. It is proposed, therefore, to use the total energy of the system as a necessary stability and accuracy criterion for the nonlinear response of conservative systems. The results also demonstrate that even for moderate nonlinearities, the effects of membrane forces have a significant influence on the system. It is also shown that while the fundamental response is contained in a first mode envelope, the fluctuations caused by the higher order modes must be resolved.
    Keywords: STRUCTURAL MECHANICS
    Type: Computers and Structures (ISSN 0045-7949); 19; 3 19
    Format: text
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  • 10
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    A numerical solution of Duffing's equations including the prediction of jump phenomena (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Numerical methodology for the solution of Duffing's differential equation is presented. Algorithms for the prediction of multiple equilibrium solutions and jump phenomena are developed. In addition, a filtering algorithm for producing steady state solutions is presented. The problem of a rigidly clamped circular plate subjected to cosinusoidal pressure loading is solved using the developed algorithms (the plate is assumed to be in the geometrically nonlinear range). The results accurately predict regions of solution multiplicity and jump phenomena.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 87-0917
    Format: text
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