| 1. |
- Alcorta, M., et al.
(författare)
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Nuclear Structure of C-12 from Break-up Studies in Complete Kinematics
- 2009
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Ingår i: AIP Conference Proceedings. - : AIP. - 1551-7616 .- 0094-243X. - 9780735407022 ; 1165, s. 27-30 461
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Konferensbidrag (refereegranskat)abstract
- A complete kinematics study of the B-10(He-3,p alpha alpha alpha) and B-11(He-3,d alpha alpha alpha) reactions has been performed to study the multi-particle break-up of C-12 resonances above the triple-alpha threshold. Four-particle coincidence detection gives us complete information on the direction and energy of the individual alpha particles from the decay of C-12, allowing us to extract new information on the structure of C-12 which we shall present in this contribution. We have observed gamma de-excitation of the T=1 15.11 MeV resonance using charged particle detectors, and have constructed Dalitz plots of the individual resonances in C-12 using the complete kinematics information of the alpha particles which come from their break-up.
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| 2. |
- Andersson, Alf, et al.
(författare)
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Failure Analysis With a New Tool Geometry, X-Die, in Areas With High Tension/Compression Strains
- 2007
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Ingår i: MATERIALS PROCESSING AND DESIGN; Modeling, Simulation and Applications; NUMIFORM '07; Proceedings of the 9th International Conference on Numerical Methods in Industrial Forming Processes (AIP Conference Proceedings). - : AIP. - 1551-7616 .- 0094-243X. - 9780735404151 ; 908, s. 1445-1450
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Konferensbidrag (refereegranskat)abstract
- Sheet-metal forming involves a complex strain distribution over the part. The strains consist of tension, compression, and a mix of both. A geometry has been developed, the X-Die, in order to gain insight into the strain behavior of different materials. The X-Die enables strain paths far into the tension/compression region, thus creating the possibility to extend the experimental base both for definition and for further extrapolation of the Forming Limit Curve (FLC) in the tension/compression region, as well as to evaluate FE-simulation results for the same region.Today, evaluation of cracks is made by using FLC. In the conventional test methods, the strains only reach 40% compression (true strain) and often much lower percentages. In conventional test methods, the FLC for any region beyond these levels is extrapolated from existing data.The experimental test proposed in this work consists of a geometry, the X-die, which has shown that rates of 70% tension/compression can be reached (point 0.7/−0.7 in the FLC). Thereby, the region for prediction of cracks on the compression side can be extended in the Forming Limit Diagram (FLD). Furthermore, the strain paths are easy to follow and the limits when cracks appear can be evaluated. Furthermore, the experimental results show that the behavior depends on the material quality. Qualities such as Extreme High Strength Steel (EHSS) and Aluminum have a limited tension/compression rate due to failure in plane strain tension. Material qualities with high r-values, e.g. Mild steel and High Strength Steel (HSS), reach high tension/compression rates before failure and have regions with clearly defined strain signatures. This will be favorable for comparison with numerical simulations, especially for strain signatures in the tension/compression region. Furthermore, the experiments did not indicate any limitation in the compression region besides the one defined in the normal procedure in creation of an FLC.This geometry is favorable to calibrate simulation results, in order to analyze prediction of strains located on the left side in an FLD. ©2007 American Institute of Physics
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| 3. |
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| 4. |
- Asadzadeh, Mohammad, 1952
(författare)
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On convergence of a h-p Streamline Diffusion and Discontinuous Galerkin Methods for the Vlasov-Poisson-Fokker-Planck System
- 2009
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Ingår i: 26th International Symposium on Rarefied Gas Dynamics, RGD26; Kyoto; Japan; 20 July 2008 through 25 July 2008. - 0094-243X .- 1551-7616. ; 1084, s. 99-104
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Konferensbidrag (refereegranskat)abstract
- In this paper we investigate the basic ingredients for global superconvergence strategy of streamline diffusion (SD) and discontinuous Galerkin (DG) finite element approximations in $H^{1}$ and $W^{1,\infty}$-norms (see \cite{Adams:75}) for the solution of the Vlasov--Poisson--Fokker--Planck system. This study is an extension of the results in \cite{Asadzadeh:90}-\cite{Asadzadeh.Sopasakis:2007}, to finite element schemes including discretizations of the Poisson term, where we also introduce results of an extension of the $h$-versions of SD and DG to the corresponding $hp$-versions. Optimal convergence results presented in the paper relay on the estimates for the regularized Green's functions with memory terms where some interpolation postprocessing techniques play important roles, see \cite{Baouendi.Grisvard:86}.
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| 5. |
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| 6. |
- Bargi, Sara, et al.
(författare)
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Two-component Bose gases under rotation
- 2008
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Ingår i: Nuclei and Mesoscopic Physic. - : AIP. - 1551-7616 .- 0094-243X. ; 995, s. 25-33
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Konferensbidrag (refereegranskat)abstract
- We examine the formation of vortices in a one- and two-component gas of bosonic atoms in a harmonic trap that is set rotating. Both the mean-field Gross-Pitaevskii approach, and the numerical diagonalization method are employed. For a two-component Bose gas, we show that beside the well-known coreless vortices of single quantization, the interatomic interactions between the two species may lead to coreless vortices of multiple quantization. We furthermore comment on the geometries of the interlaced vortex patterns. In the limit of weak interactions, we finally demonstrate a number of exact results.
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| 7. |
- Bengtsson, Ingemar
(författare)
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A Kochen-Specker Inequality
- 2009
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Ingår i: AIP Conference Proceedings. - : AIP. - 0094-243X .- 1551-7616. ; 1101, s. 241-245
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- I review a paper by Klyachko, Can, Binicioğlu, and Shumovsky, and explain a little of the background as I see it
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| 8. |
- Bijnens, Johan
(författare)
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Chiral meson physics at two loops
- 2005
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Ingår i: AIP Conference Proceedings. - : AIP. - 1551-7616 .- 0094-243X. ; 768, s. 153-159
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Konferensbidrag (refereegranskat)abstract
- An overview of chiral perturbation theory calculations in the mesonic sector at the two loop level is given. Discussed in some detail are the partially quenched case relevant for lattice QCD, the general fitting procedures and ππ, πK scattering as well as the determination of Vus and K13 decays
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| 9. |
- Brage, Tomas, et al.
(författare)
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Forbidden and Unexpected atomic transitions
- 2009
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Ingår i: AIP Conference Proceedings (ICAMDATA-2008). - : AIP. - 0094-243X .- 1551-7616. ; 1125, s. 18-28
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Konferensbidrag (refereegranskat)abstract
- This paper includes a discussion and classification of what is generally referred to as '"Forbidden lines"' in atomic physics. Historical and important examples are reviewed, in light of their challenge to computations and remaining disagreements between experiment and theory. We also review some recent results on what could be labeled the third generation of unexpected transitions, induced by hyperfine quenching.
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| 10. |
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