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  • 1
    Electronic Resource
    Electronic Resource
    A three-dimensional quadratic nonconforming element (1985)
    Springer
    Numerische Mathematik 46 (1985), S. 269-279 
    Details
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65N30 ; CR: G1.8
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary We define a second-degree nonconforming element on tetrahedra. We build a basis for the opproximation space derived from this element. We prove a discrete regularity property similar to the one that holds for the corresponding two-dimensional element.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01390424
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  • 2
    Electronic Resource
    Electronic Resource
    The pattern of secondary root formation in curving roots of Arabidopsis thaliana (L.) Heynh. (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 12 (1989), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. A gravitational stimulus was used to induce the curvature of the main root of Arabidopsis thaliana. The number of secondary roots increased on the convex side and decreased on the concave side of any curved main root axes in comparison with straight roots used as the control. The same phenomenon was observed with the curved main roots of plants grown on a clinostat and of mutant plants exhibiting random root orientation. The data suggest that the pattern of lateral root formation is associated with curvature but is independent of the environmental stimuli used to induce curvature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1989.tb01949.x
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  • 3
    Electronic Resource
    Electronic Resource
    Nodulins and nodulin genes of Glycine max (1986)
    Springer
    Plant molecular biology 7 (1986), S. 51-61 
    Details
    ISSN: 1573-5028
    Keywords: Soybean ; Rhizobium ; nitrogen fixation ; gene expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Nodulins are organ-specific plant proteins induced during symbiotic nitrogen fixation. Nodulins play both metabolic and structural roles within infected and uninfected nodule cells. In soybean, several nodulin genes, coding for abundant nodulins, have been identified and isolated. Structural analysis of some of these genes has revealed their possible mode of regulation and the subcellar location of the protein product. Studies of ineffective symbiosis based on cultivar-strain genotype differences suggested that both partners influence the expression of nodulin genes. Concomitant with nodule organogenesis, the Rhizobium undergoes substantial differentiation leading to the accumulation of nodule-specific bacterial proteins, bacteroidins. The major structural alteration occuring in the infected cell is the formation of a membrane enclosing the bacteroid (peribacteroid membrane). A number of nodulins are specifically targetted to this membrane during endosymbiosis. The induction of nodulins and bacteroidins leads to the formation of an effective nodule. Nodulin genes can be induced in vitro by factors derived from nodules suggesting that trans-activators may be involved in derepression of the host genes necessary for Rhizobium-legume symbiosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00020131
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  • 4
    Electronic Resource
    Electronic Resource
    Experiments with several elements for viscous incompressible flows (1985)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 5 (1985), S. 911-928 
    Details
    ISSN: 0271-2091
    Keywords: Incompressible ; Finite Elements ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: We present a numerical procedure to eliminate internal nodes from elements designed to approximate incompressible flow problems. We compare six elements in academic and industrial like flow problem and we discuss their relative qualities. A surprising conclusion is that richer elements may behave less well than simple ones if a good enforcement of incompressibility is not maintained.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650051005
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  • 5
    Electronic Resource
    Electronic Resource
    Simulation of forming processes by FEM with a Bingham fluid model (1986)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 6 (1986), S. 197-218 
    Details
    ISSN: 0271-2091
    Keywords: Bingham Fluids ; Forming Process ; Non-Newtonian Flows ; Finite Elements ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: We model the forming process as a fluid flow. A finite element program, FIDAP, which analyses flow problems, was used to calculate velocity and strain rates at points throughout the material during the deformation process. This allows predictions to be made on the shape and quality of the resulting part. The stress-strain relation we used models the plastic flow of metals (Bingham fluids). The FEM approximation of such a fluid is tested by comparing results for a simple analytical example. In forming processes provision must be made for friction between dye and workpiece, and the program was modified accordingly. Two classical ring forming simulations are compared to published results.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650060403
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  • 6
    Electronic Resource
    Electronic Resource
    A finite element procedure for viscoelastic flows (1987)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 7 (1987), S. 1035-1052 
    Details
    ISSN: 0271-2091
    Keywords: Non-Newtonian Flows ; Viscoelasticity ; Maxwell Fluids ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A finite element method for the simulation of viscoelastic flows has been developed. It uses a weak formulation of the method of characteristics to treat the viscoelastic constitutive law. Numerical results in a 4:1 contraction are presented and are discussed with respect to previous computations. New phenomena are put in evidence and new questions are opened in this already controversial problem.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650071004
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  • 7
    Electronic Resource
    Electronic Resource
    A generalization of Uzawa's algorithm for the solution of the Navier-Stokes equations (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Communications in Applied Numerical Methods 1 (1985), S. 205-208 
    Details
    ISSN: 0748-8025
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Usawa's algorithm provides an efficient method for solving the divergence-free Stokes problem. On the other hand, the Newton-Raphson scheme is very popular for the solution of the nonlinear Navier-Stokes equations. We propose here a new method that combines these two algorithms and converges to a divergence-free solution of the nonlinear Navier-Stokes equations.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cnm.1630010504
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