| 1. |
- Huang, Shuo, et al.
(författare)
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Thermal expansion in FeCrCoNiGa high-entropy alloy from theory and experiment
- 2017
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Ingår i: Applied Physics Letters. - : AMER INST PHYSICS. - 0003-6951 .- 1077-3118. ; 110:24
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Tidskriftsartikel (refereegranskat)abstract
- First-principle alloy theory and key experimental techniques are applied to determine the thermal expansion of FeCrCoNiGa high-entropy alloy. The magnetic transition, observed at 649 K, is accompanied by a significant increase in the thermal expansion coefficient. The phase stability is analyzed as a function of temperature via the calculated free energies accounting for the structural, magnetic, electronic, vibrational and configurational contributions. The single-and polycrystal elastic modulus for the ferro-and paramagnetic states of the face-centered and body-centered cubic phases are presented. By combining the measured and theoretically predicted temperature-dependent lattice parameters, we reveal the structural and magnetic origin of the observed anomalous thermal expansion behavior. Published by AIP Publishing.
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| 2. |
- Jia, Tao, 1983-, et al.
(författare)
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An empirical study on human mobility and its agent-based modeling
- 2012
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Ingår i: Journal of Statistical Mechanics. - Bristol : Institute of Physics Publishing (IOPP). - 1742-5468.
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Tidskriftsartikel (refereegranskat)abstract
- This paper aims to analyze the GPS traces of 258 volunteers for a better understanding of both the human mobility patterns and the mechanism. We report the regular and scaling properties of human mobility from several aspects, and importantly we find its levy flight characteristic which is consistent with the previous studies. We further assume two factors that may govern the levy flight property: (1) the scaling and hierarchical properties of the purpose clusters which serve as the underlying spatial structure, and (2) the individual preferential behavior. To verify the assumptions, we implement an agent-based model with the two factors, and the simulated agents indeed reproduce the same levy flight pattern as the observed one. In order to enable the model to reproduce more mobility patterns, we add the model a third factor, the jumping factor which means the probability that one person may cancel the regular mobility schedule and visit a random place. With this factor, our model could cover a relatively wide range of human mobility patterns with exponent values from 1.55 to 2.05.
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| 3. |
- Johansson, Sverker
(författare)
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Vackrare värld med fysik
- 2006
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Ingår i: Lärandets konst. - Lund : Studentlitteratur. - 9789144045559 ; , s. 105-126
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 4. |
- Jääskeläinen, Markku, et al.
(författare)
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Refraction in spacetime
- 2011
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Ingår i: American Journal of Physics. - : American Association of Physics Teachers (AAPT). - 0002-9505 .- 1943-2909. ; 79:6
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Tidskriftsartikel (refereegranskat)abstract
- Refraction, interference, and diffraction are distinguishing features of wavelike phenomena. Although they are usually associated only with a purely spatial wave-propagation pattern, analogs to interference and diffraction involving the spatio-temporal dynamics of waves in one dimension have been discussed. We complete the triplet of analogies by discussing how spatio-temporal analogs to refraction are exhibited by a quantum particle in one dimension that is scattering off a step barrier. Similarly, birefringence in spacetime occurs for a spin-1/2 particle in a magnetic field.
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