| 1. |
- Hösthagen, Anders, et al.
(författare)
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Thermal crack risk estimations for tunnel : equivalent restraint method correlated to empirical observations
- 2014
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Ingår i: Nordic Concrete Research. - 0800-6377. ; 49, s. 127-143
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Tidskriftsartikel (refereegranskat)abstract
- The present study deals with the correlation between numerical models and empirical observations in newly cast concrete structures. The model used is the equivalent restraint method, ERM, which is established from several local restraint method calculations, LRM. The casting of walls and roof in a tunnel construction is investigated. Correlation between models and empirical measurements is established in three steps: 1) the restraint situation is analyzed; 2) the calculated temperature developments are compared to empirical temperature measurements to calibrate the models; and 3) calculated strain ratios are compared with observed crack patterns, and in general a good correlation is achieved
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| 2. |
- Vestergren, Anders, et al.
(författare)
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Effect of columnar disorder on the superconducting transition of a type-II superconductor in zero applied magnetic field
- 2004
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Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 70:5
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Tidskriftsartikel (refereegranskat)abstract
- We investigate the effect of random columnar disorder on the superconducting phase transition of a type-II superconductor in zero applied magnetic field using numerical simulations of three dimensional XY and vortex loop models. We consider both an unscreened model, in which the bare magnetic penetration length is approximated as infinite, and a strongly screened model, in which the magnetic penetration length is of order the vortex core radius. We consider both equilibrium and dynamic critical exponents. We show that, as in the disorder free case, the equilibrium transitions of the unscreened and strongly screened models lie in the same universality class, however scaling is now anisotropic. We find for the correlation length exponent nu=1.2+/-0.1, and for the anisotropy exponent zeta=1.3+/-0.1. We find different dynamic critical exponents for the unscreened and strongly screened models.
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