University of Ioannina

About: University of Ioannina is a education organization based out in Ioannina, Greece. It is known for research contribution in the topics: Population & Large Hadron Collider. The organization has 7654 authors who have published 20594 publications receiving 671560 citations. The organization is also known as: Panepistimio Ioanninon.

Measurement of the prompt J/ψ and ψ(2S) polarizations in pp collisions at s=7 TeV

Abstract: The polarizations of prompt J/ψJ/ψ and ψ(2S)ψ(2S) mesons are measured in proton–proton collisions at View the MathML sources=7 TeV, using a dimuon data sample collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 4.9 fb−1. The prompt J/ψJ/ψ and ψ(2S)ψ(2S) polarization parameters λϑλϑ, λφλφ, and λϑφλϑφ, as well as the frame-invariant quantity View the MathML sourceλ˜, are measured from the dimuon decay angular distributions in three different polarization frames. The J/ψJ/ψ results are obtained in the transverse momentum range 14

Radio Emission of the Quiet Sun and Active Regions (Invited Review)

Abstract: Solar radio emission provides valuable information on the structure and dynamics of the solar atmosphere above the temperature minimum. We review the background and most recent observational and theoretical results on the quiet Sun and active region studies, covering the entire radio range from millimeter to decameter wavelengths. We examine small- and large-scale structures, at short and long time scales, as well as synoptic aspects. Open questions and challenges for the future are also identified.

MRI evaluation of the basal ganglia size and iron content in patients with Parkinson's disease.

Abstract: To evaluate by MRI the area size and the degree of iron accumulation in basal ganglia nuclei that are implicated in the pathogenesis of Parkinson's disease (PD). 40 patients with idiopathic PD and 40 controls were examined on a 1. 5 Tesla MR imager, using a multiecho SE sequence 2000/20, 40, 60, 80, 100, 120, 140, 160 (TR/TE). The T2 relaxation time (T2) and the area of substantia nigra zona compacta (SNc), substantia nigra zona reticulata (SNr), putamen (Pu), globus pallidus external (GPe), globus pallidus internal (GPi), caudate nucleus (CN), locus coeruleus (LC) and subthalamic nucleus (STN) were assessed. The T2 of SNc (76. 8 ± 6. 0) was lower and of Pu (79.5 ± 6.0) and GPe (69.5 ± 7.0) was higher in patients than in controls (78.6 ± 3.8, 77.4 ± 3.9 and 67.3 ± 5.7, respectively), p < 0.05. The area of CN (125.9 ± 20.2) and Pu (201.5 ± 48.7) was higher in patients than in controls (110.7 ± 21.5 and 180.1 ± 41.1, respectively), p < 0.05. A more pronounced decrease in the T2 of SNc (73.6 ± 8.9) was observed when the more affected side of patients was evaluated separately. In patients with disease duration > 5 years the T2 of STN (71.5 ± 6.3) was lower and the area of Pu was higher (215.3 ± 54.9) compared with those with disease duration ≤ 5 years (75.8 ± 10.9 and 190.9 ± 41.0 respectively), p < 0.05. These findings suggest that dysfunction of the basal ganglia circuitry in PD may affect iron content not only in SNc but in STN, Pu and GPe as well. Compensatory sprouting of the remaining dopaminergic fibers could account for the increased area of the CN and Pu.