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We have studied excitation energy transfer in the photosynthetic antenna systems LH1 and LH2 of purple bacteria. Femtosecond pump-probe experiments were combined with computer simulations using the recently established structure of these systems to assess the nature of electronic excitation. We have measured the transient absorption kinetics and spectra of the LH1 and LH2 complexes in the temp
When Sweden adopted its carbon tax in 1990, it was as one of the first of its kind worldwide. While the adoption of the tax has been attributed to its inclusion in the Swedish tax reform, undoubtedly playing a crucial role, the reform does not in itself explain how the Swedish carbon tax came about or why it became part of the reform package in the first place. In this article, we present a case s
Objective: This study aimed to report changes in the annual incidence of invasive treatment, changes in invasive treatment modalities, and sex differences in patients treated for intermittent claudication (IC) due to infrainguinal lesions in Sweden between 2009 and 2022. Methods: Data were collected from the Swedish Vascular Registry (Swedvasc), including all registrations of invasive treatment fo
Familial clustering of lung cancer (LC) is related to shared smoking habits but the contribution of other potential factors such as sex or histology is not well known, and these are the subjects of the present study in Sweden. Family relationships (from Multigeneration register) and diagnosed cancers (from Cancer registry) were obtained from the national registers from 1961 to 2021. The overall fa
Recently, Attaccalite et al. proposed a new expression for the exchange-correlation energy of the two-dimensional electron gas, based on quantum Monte Carlo calculations. We compare this functional with the established expression given by Tanatar and Ceperley for use in density functional calculations. As model systems serve a circular few-electron quantum dot and a square lattice of dots. For sin
The rotational behavior of T=0 and T=1 bands in the odd-odd N=Z nucleus 62Ga is studied theoretically using the spherical shell model (laboratory frame) and the cranked Nilsson-Strutinsky model (intrinsic frame). Both models give a good description of available experimental data. The role of isoscalar and isovector pairing in the T=0 and T=1 bands as functions of angular momentum is studied in the
OBJECTIVES: To explore and compare the prevalences of a wide range of comorbidities in axial spondyloarthritis (axSpA) versus the general population, and in non-radiographic versus radiographic axSpA (nr-axSpA/r-axSpA).METHOD: Well-characterized axSpA patients (n = 246) from the SPARTAKUS cohort (55% men; mean age/disease duration 52/26 years; nr-axSpA/r-axSpA = 82/164) were included, and matched
Rotational behavior inducing triaxiality is discussed for 48Cr in the cranked Nilsson-Strutinsky (CNS) model, as well as in the spherical shell model. It is shown that the low-spin region up to about 1 = 8, has a prolate well-deformed shape. At higher spins the shape is triaxial with a 'negative-γ' deformation, that is, with rotation around the classically forbidden intermediate axis. By comparing
The tunneling process that governs the decay from superdeformed to normal-deformed nuclear states is shown to be enhanced by several orders of magnitude (104 – 106) if the normal-deformed states are chaotic at the moment of decay out. The onset of (long-range) chaos may imply that the tunneling enhancement increases with decreasing angular momentum. Experimental signatures are discussed.
A detailed theoretical investigation of polarization effects in superdeformed nuclei is performed. In the pure harmonic oscillator potential it is shown that when one particle (or hole) with the mass single-particle quadrupole moment qν is added to a superdeformed core, the change of the electric quadrupole moment can be parameterized as qeff = e(bqν + a), and analytical expressions are derived fo
It is shown that the decay out from superdeformed bands is enhanced by several orders of magnitude due to the onset of chaos in normal deformed states. The onset of chaos is caused by the residual two-body interaction, that plays a crucial role for the normal deformed states at excitation energies where the decay out occurs (3-5 MeV). At these excitation energies the distribution of nearest neighb
The mechanism of band termination is discussed from the spherical shell model point of view, and the role of breaking nucleon pairs within a given j-shell configuration is stressed. Two main types of band terminations are discussed. In one type the band termination includes a sequence of states within an approximative seniority coupling scheme and therefore is smooth. In the other type the termina
Deformation properties of weakly bound nuclei are discussed in the deformed single-particle model. It is demonstrated that in the limit of a very small binding energy the valence particles in specific orbitals, characterized by a very small projection of single-particle angular momentum onto the symmetry axis of a nucleus, can give rise to the halo structure which is completely decoupled from the
Various theoretical approaches to proton emission from spherical nuclei are investigated, and it is found that all the methods employed give very similar results. The calculated decay widths are found to be qualitatively insensitive to the parameters of the proton-nucleus potential, i.e., changing the potential parameters over a fairly large range typically changes the decay width by no more than
BACKGROUND: Extensive head and neck reconstructive surgery is a complex procedure often performed in patients with multiple comorbidities, and the risk of complications is high. Evidence-based preoperative assessment and reliable risk prediction are therefore essential, and the anesthesiologist plays an important role in this process. The aim of this study was to evaluate the predictive properties
Kraft black liquor, a side-stream of the pulp and paper industry, contains lignin, hemicelluloses, and cooking chemicals. This stream is typically evaporated and burned in the recovery boiler to generate power and recover the cooking chemicals used in the pulping process to digest the wood. However, the recovery boiler is often the bottleneck of the chemical-recovery process. By removing lignin fr
The possibility that shell structure related to double-spherical shapes may produce new regions of superdeformed or "hyperdeformed" nuclei is discussed. Of special interest is the mass region around 180Hg (90Zr+90Zr) which is studied in detail. Extended cranked Nilsson-Strutinsky calculations are performed with the Woods-Saxon potential and finite-range liquid-drop model, and "hyperdeformations" w
The nearest neighbour level spacing distribution and the Δ3 statistic of level fluctuations associated with very high spin states (I ≳ 30) in rare-earth deformed nuclei are analysed by means of a cranked shell model. The many particle-many hole configurations created in the rotating Nilsson potential are mixed by the surface-delta two-body residual interaction. The levels in the near-yrast region
The dynamics of a classical, heavy system coupled to a quantum mechanical light system is studied in a simple time-dependent random matrix model, where the degree of complexity can be changed by a “chaoticity parameter.” It is shown that the energy of the quantum mechanical system diffuses as it interacts with the classical system, providing it is chaotic, while a ballistic behavior appears in the
