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  • Nuclear Reactions  (3)
  • Engineering  (2)
  • LUNAR AND PLANETARY EXPLORATION  (2)
  • 1
    Electronic Resource
    Electronic Resource
    R-S ADAPTED ARBITRARY LAGRANGIAN-EULERIAN FINITE ELEMENT METHOD FOR METAL-FORMING PROBLEMS WITH STRAIN LOCALIZATION (1996)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 39 (1996), S. 3247-3272 
    Details
    ISSN: 0029-5981
    Keywords: arbitrary Lagrangian-EulerianFEM ; r-adaptation ; s-adaptation ; metal forming ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: In this paper, an adaptive Arbitrary Lagrangian-Eulerian (ALE) finite element method is developed for solving large deformation problems with applications in metal-forming simulation. The ALE mesh movement is coupled with r-adaptation of automatic node relocation, to minimize element distortion during the process of deformation. Strain localization is considered in this study through the constitutive relations for ductile porous materials. Prediction of localized deformation is achieved through a multilevel mesh superimposition method, termed as s-adaptation. The model is validated by comparison with established results and codes, and a few metal-forming problems are simulated to test its effectiveness.
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    A MODEL FOR ANALYSIS OF ARBITRARY COMPOSITE AND POROUS MICROSTRUCTURES WITH VORONOI CELL FINITE ELEMENTS (1996)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 39 (1996), S. 2363-2398 
    Details
    ISSN: 0029-5981
    Keywords: Voronoi cell finite element model ; porous and composite materials ; elastoplasticity ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The Voronoi Cell Finite Element Model (VCFEM) has been successfully developed for materials with arbitrary microstructural distribution. In this method, the finite element mesh evolves naturally by Dirichlet Tessellation of the microstructure. Composite VCFEM for small deformation plasticity has been developed by expressing the element stresses in terms of polynomial expansions of location co-ordinates. Though this works well for discrete composites with inclusions, its effectiveness diminishes sharply for porous materials with voids. The effect worsens sharply with voids of arbitrary shapes. To overcome this limitation, a new way of defining stress functions is introduced in this paper. Based on a transformation method similar to the Schwarz-Christoffel conformal mapping, it introduces reciprocal stress functions that are derived to incorporate shape effects. Several numerical experiments are conducted to establish the strength of this formulation. The effect of various microstructural morphologies on the overall response and local variables are studied.
    Additional Material: 25 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 3
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    Evidence of quasifission in the ^{16} O +  ^{238} U reaction at sub-barrier energies (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-02-10
    Description: Author(s): K. Banerjee, T. K. Ghosh, S. Bhattacharya, C. Bhattacharya, S. Kundu, T. K. Rana, G. Mukherjee, J. K. Meena, J. Sadhukhan, S. Pal, P. Bhattacharya, K. S. Golda, P. Sugathan, and R. P. Singh Mass distribution of fission fragments and neutron multiplicity in the ^{16} O+^{238} U reaction were measured at near- and below-barrier energies. A sudden change in the fragment mass width, observed in the present measurement, confirmed the transition to quasifission at below-barrier energies; the... [Phys. Rev. C 83, 024605] Published Wed Feb 09, 2011
    Keywords: Nuclear Reactions
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Fragment emission mechanism in the ^{32} S+ ^{12} C reaction (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-06-06
    Description: Author(s): Ratnesh Pandey, S. Kundu, C. Bhattacharya, K. Banerjee, T. K. Rana, S. Manna, G. Mukherjee, J. K. Meena, A. Chaudhuri, T. Roy, Pratap Roy, Md. A. Asgar, V. Srivastava, A. Dey, M. Sinha, T. K. Ghosh, S. Bhattacharya, S. K. Pandit, K. Mahata, P. Patle, S. Pal, A. Shrivastava, and V. Nanal The complex fragment emission from the decay of fully energy-relaxed composite, Ti * 44 formed via the S 32 + C 12 reaction at two excitation energies, have been studied. Inclusive energy distributions of the fragments ( 3 ≤ Z ≤ 8 ) emitted in the reaction S 32 + C 12 have been measured in the angular range ∼ 16 ∘ – 28 … [Phys. Rev. C 95, 064603] Published Mon Jun 05, 2017
    Keywords: Nuclear Reactions
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Fission fragment mass distributions from $^{210}\mathrm{Po}$ and $^{213}\mathrm{At}$ (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-12-19
    Description: Author(s): A. Sen, T. K. Ghosh, S. Bhattacharya, K. Banerjee, C. Bhattacharya, S. Kundu, G. Mukherjee, A. Asgar, A. Dey, A. Dhal, Md. Moin Shaikh, J. K. Meena, S. Manna, R. Pandey, T. K. Rana, Pratap Roy, T. Roy, V. Srivastava, and P. Bhattacharya Background : The influence of shell effect on the dynamics of the fusion fission process and its evolution with excitation energy in the preactinide Hg-Pb region in general is a matter of intense research in recent years. In particular, a strong ambiguity remains for the neutron shell closed Po 210 nu... [Phys. Rev. C 96, 064609] Published Mon Dec 18, 2017
    Keywords: Nuclear Reactions
    Print ISSN: 0556-2813
    Electronic ISSN: 1089-490X
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    A reconsideration of the effects of terminator ionopause height on the nightward ion transport at Venus (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The ionopause altitude near the terminator is a crucial parameter for studies dealing with the maintenance of the nightside ionosphere of Venus. It is generally thought that, during high solar wind dynamic pressures (P(SW)) or during solar minimum conditions, the ionopause comes down to very low altitudes so that the dayside ionosphere is not able to supply sufficient plasma to maintain the observed nightside densities. However, there are a number of workable definitions of the ionopause. Near the terminator, the altitude of the ionopause differs considerably depending upon the definition. The ionopause deduced from the radio occultation experiment as well as the pressure ionopause can be significantly lower than the density ionopause deduced from the Langmuir probe at these locations. The latter refers to the altitude where the electron density falls to 100/cu cm. Using in situ data from the Pioneer Venus Orbiter, it is shown that the density ionopause remains fairly high even for high P(SW) conditions. Simple quantitative estimates indicate that significant flow of plasma is still possible under these conditions. Thus, nightward transport of plasma during high P(SW) conditions may be more efficient than has been assumed so far. Since such conditions are more prevalent during solar cycle minimum, it is argued that transport may be relevant in the maintenance of nightside ionosphere at that time also.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 97; A9, S; 13
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  • 7
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    Variability of dayside electron temperature at Venus (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Langmuir probe measurements on Pioneer Venus Orbiter show that electron temperature (Te) profiles exhibit two distinct regions. The lower, but more extended region is in the main ionosphere where Te increases slowly with altitude. The other, less extended region is in the ionopause, where Te rise sharply with altitude. If horizontal magnetic fields and flux ropes in the ionosphere inhibit vertical thermal conductivity sufficiently, then the observed Te profile could be explained with EUV as the major heat source (Cravens et al., 1980). The rise in Te in the ionopause region has generally been attributed to solar wind heating (Brace and Kliore, 1991). We suggest that this sharp rise in Te is due primarily to the steep fall in electron density, Ne. If the heating rate is essentially unchanged and heat conduction is not of primary importance, then a steep rise in Te will maintain a constant electron cooling rate for a steeply falling Ne. We have observed large orbit to orbit variations in Te in the ionopause region which are found to be inversely related to changes in Ne. Variations in solar wind dynamic pressure do not seem to have a direct effect on Te, rather the effect is indirect coming through the sharp decrease in Ne.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: PAPER-93GL03384 , Geophysical Research Letters (ISSN 0094-8276); 21; 1; p. 77-80
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