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  • NUMERICAL ANALYSIS  (6)
  • Engineering  (4)
  • CEC  (2)
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  • 1
    Digitale Medien
    Digitale Medien
    The effect of growth regulators on root cation exchange capacity of young clonal tea plants (1984)
    Springer
    Plant and soil 79 (1984), S. 441-444 
    Details
    ISSN: 1573-5036
    Schlagwort(e): Brown: white root ratio ; CEC ; Growth regulators ; Tea ; Top growth
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary A sand culture experiment was conducted under glasshouse conditions to study the effect of gibberellic acid (GA3), indol-3yl-acetic acid (IAA) and 2,4-dichlorophenoxy acetic acid (2,4-D) on root cation exchange capacity (CEC) of two genetically different tea clones. Results showed that application of GA3 and IAA progressively increased root CEC in both clones when their concentration was raised from 0 to 100 mgl−1. 2,4-D at its lower concentration (〈25 mg l−1) produced the same effect, while at higher concentration (100 mg l−1) there was a decrease in root CEC. The root CEC was correlated negatively with brown: white root ratio and positively with top growth of clonal tea plants.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02184335
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Determination of cation exchange capacity of woody plant roots using ammonium acetate extractant (1982)
    Springer
    Plant and soil 68 (1982), S. 135-138 
    Details
    ISSN: 1573-5036
    Schlagwort(e): Ammonium acetate ; CEC ; Immersion time ; Root/solution ratio
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary A rapid exchange procedure using ammonium acetate as an extractant was developed for measurement of cation exchange capacity (CEC) of plant roots. The CEC values obtained with 1∶100 and 1∶200 root/solution ratios were almost equal, though the values increased with length of the time of immersion in both the root/solution ratios. The method gave higher CEC values with fresh roots as compared to dried roots. However, dried milled and dried unmilled roots gave identical values.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02374734
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    PROPAGATION OF RAYLEIGH WAVES IN A HETEROGENEOUS INCOMPRESSIBLE SUBSTRATUM OVER A HOMOGENEOUS INCOMPRESSIBLE HALF-SPACE (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    International Journal for Numerical and Analytical Methods in Geomechanics 20 (1996), S. 365-375 
    Details
    ISSN: 0363-9061
    Schlagwort(e): Rayleigh waves ; propagation ; heterogeneous incompressible substratum ; homogeneous incompressible half-space ; Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Geologie und Paläontologie
    Notizen: The paper studies the propagation of Rayleigh waves in an incompressible layer with general variation of rigidity as μ=μ0(1+bz)m resting over a homogeneous incompressible elastic half-space. Instead of using the Whittaker function, the expansion formula proposed by Newlands has been used for better results at shallow depths. As a particular case for m=1, the results have been shown to coincide with those obtained by Newlands. The velocities have been computed for different values of m and the results are presented in graphs.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
  • 4
    Digitale Medien
    Digitale Medien
    PROPAGATION OF TORSIONAL SURFACE WAVES IN VISCOELASTIC MEDIUM (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    International Journal for Numerical and Analytical Methods in Geomechanics 20 (1996), S. 209-213 
    Details
    ISSN: 0363-9061
    Schlagwort(e): torsional surface waves ; geophysical prospecting ; earthquake damage ; Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Geologie und Paläontologie
    Notizen: It is well known that an elastic homogeneous half-space does not allow torsional surface waves to propagate. The present paper attempts to find out the possibility of propagation of such waves in a viscoelastic half-space. The study reveals that although the homogeneous elastic half-space does not allow torsional surface waves to propagate, a viscoelastic half-space does so. The wave is damped due to the viscoelastic parameter. It has also been found that as the viscoelastic parameter decreases, the medium becomes elastic and the torsional surface waves ceases to propagate.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
  • 5
    Digitale Medien
    Digitale Medien
    Torsional surface wave in an elastic half-space with void pores (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    International Journal for Numerical and Analytical Methods in Geomechanics 17 (1993), S. 197-204 
    Details
    ISSN: 0363-9061
    Schlagwort(e): Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Geologie und Paläontologie
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/nag.1610170305
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 6
    Digitale Medien
    Digitale Medien
    PROPAGATION OF TORSIONAL SURFACE WAVES IN A HOMOGENEOUS SUBSTRATUM OVER A HETEROGENEOUS HALF-SPACE (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    International Journal for Numerical and Analytical Methods in Geomechanics 20 (1996), S. 287-294 
    Details
    ISSN: 0363-9061
    Schlagwort(e): torsional surface waves ; propagation ; hoterogeneous half-space ; Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Geologie und Paläontologie
    Notizen: The paper discusses the propagation of torsional surface wave in a homogeneous substratum over a half-space with linearly varying rigidity and density. The study reveals that under assumed conditions, a torsional surface wave propagates in the medium. The velocities of torsional surface waves have been calculated numerically and are presented in a number of graphs. It is also observed that for a stratum over a homogeneous half-space, the velocity of torsional surface waves coincides with that of Love waves. For a non-homogeneous half-space it is observed that the velocity of torsional surface waves is always higher than that of Love waves propagated in a homogeneous layer over a homogeneous half-space. An attempt is also made to assess the possible propagation of torsional surface waves in a half-space with linearly varying rigidity and density, lacking a superficial layer. It is concluded that such a half-space allows two solutions for torsional waves while a homogeneous half-space has one.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
  • 7
    facet.materialart.
    Unbekannt
    Explicit finite difference predictor and convex corrector with applications to hyperbolic partial differential equations (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: An explicit finite difference scheme consisting of a predictor and a corrector has been developed and applied to solve some hyperbolic partial differential equations (PDEs). The corrector is a convex-type function which is applied at each time level and at each mesh point. It consists of a parameter which may be estimated such that for larger time steps the algorithm should remain stable and generate a fast speed of convergence to the steady-state solution. Some examples have been given.
    Schlagwort(e): NUMERICAL ANALYSIS
    Materialart: Computers and Mathematics with Applications (ISSN 0097-4943); 9; 3, 19; 1983
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
    facet.materialart.
    Unbekannt
    Nonlinear grid error effects on numerical solution of partial differential equations (1980)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: Finite difference solutions of nonlinear partial differential equations require discretizations and consequently grid errors are generated. These errors strongly affect stability and convergence properties of difference models. Previously such errors were analyzed by linearizing the difference equations for solutions. Properties of mappings of decadence were used to analyze nonlinear instabilities. Such an analysis is directly affected by initial/boundary conditions. An algorithm was developed, applied to nonlinear Burgers equations, and verified computationally. A preliminary test shows that Navier-Stokes equations may be treated similarly.
    Schlagwort(e): NUMERICAL ANALYSIS
    Materialart: NASA. Langley Research Center Numerical Grid Generation Tech.; p 221-230
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
    facet.materialart.
    Unbekannt
    Numerical modeling of D-mappings with applications to chemical kinetics (1984)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Numerical modeling of D-mappings was studied and applied to solving nonlinear stiff systems. These mappings were locally linearized for convergence analysis, and some applications were made to chemical kinetics. The technique avoids using multistep implicit codes that require inversion of Jacobian matrices, but depends on the Jacobians for its convergence analysis.
    Schlagwort(e): NUMERICAL ANALYSIS
    Materialart: NASA-TM-84332 , A-9256 , NAS 1.15:84332
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 10
    facet.materialart.
    Unbekannt
    Numerical solutions of nonlinear STIFF initial value problems by perturbed functional iterations (1982)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Numerical solution of nonlinear stiff initial value problems by a perturbed functional iterative scheme is discussed. The algorithm does not fully linearize the system and requires only the diagonal terms of the Jacobian. Some examples related to chemical kinetics are presented.
    Schlagwort(e): NUMERICAL ANALYSIS
    Materialart: NASA-TM-84234 , NAS 1.15:84234
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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