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We study classical and quantum chaos for two interacting particles on the plane. This is the simplest nontrivial case which sheds light on chaos in interacting many-body systems. The system consists of a confining one-body potential, assumed to be a deformed harmonic oscillator, and a two-body interaction of Coulomb type. In general, the dynamics is mixed with regular and chaotic trajectories. The

We comment on the recent calculations of the pion pole part of the light-by-light contribution to the muon anomalous magnetic moment and we point out where the analysis in our previous work was mistaken.

We investigate the Derjaguin approximation by explicitly determining the interactions between two spherical colloids using density functional theory solved in cylindrical coordinates. The colloids are composed of close-packed Lennard-Jones particles. The solvent particles are also modeled via Lennard-Jones interactions. Cross interactions are assumed to follow the commonly used Lorentz-Berthelot (

Effects of flow are a fundamental part of magnetic resonance imaging (MRI). Since almost every part of the body contains some kind of flow, the effects are seen in generally all MR images. The presence of flow in an image slice may be a vast source of artefacts but the effects of flow can also be used for diagnostic purposes, for example in magnetic resonance angiography (MRA). In MRA, flow effect

https://www.ehl.lu.se/kajsa-ekholm - 2026-07-24

https://www.ehl.lu.se/niaz-patwary - 2026-07-24

https://www.ehl.lu.se/daphne-geveke - 2026-07-24

https://www.ehl.lu.se/micael-jonsson - 2026-07-24

https://www.ehl.lu.se/emilie-hesselbo - 2026-07-24

https://www.ehl.lu.se/maryam-akhondipour - 2026-07-24

https://www.ehl.lu.se/gabriella-radencrantz - 2026-07-24

https://www.jur.lu.se/hans-liepack - 2026-07-24

https://www.intramed.lu.se/jessika-hoppe - 2026-07-24

Density functional theory is used to study polymer solutions between surfaces in equilibrium with a bulk solution. We investigate the effect on the surface interaction free energy of having star polymers with different numbers of arms. In addition, we consider the role played by the strength of the adsorption potential and the concentration of the polymer molecules. The interaction free energy is

Understanding the population highs and lows of periodic outbreaks of insect pests should contribute to more efficient control measures. As Ranta and colleagues discuss in their Perspective, a new modeling approach (Bjørnstad et al.) has accurately predicted the direction and speed of traveling waves of larch budmoth outbreaks, which have defoliated large areas of larch forest in the European Alps.

Postantibiotic effects (PAEs), postantibiotic sub-MIC effects, and sub-MIC effects of the new nonfluoroquinolone PGE-9509924, ciprofloxacin, and levofloxacin against gram-positive and gram-negative strains were investigated. In comparison to ciprofloxacin and levofloxacin, PGE-9509924 exerted very similar PAEs against all strains except for both strains of Streptococcus pneumoniae, where longer PA

When converting fractional (percentage) depth doses to tissue-phantom ratios, one must use a factor that accounts for the different source-to-point distances. Two minor correction factors are also involved. One is the ratio of total to primary dose at the two different distances from the source, for the same depth and field size. This factor is usually ignored. It was determined experimentally tha