University of Zagreb

About: University of Zagreb is a education organization based out in Zagreb, Grad Zagreb, Croatia. It is known for research contribution in the topics: Population & European union. The organization has 21769 authors who have published 50267 publications receiving 783239 citations. The organization is also known as: Zagreb University & Sveučilište u Zagrebu.

High-transport critical current density above 30 K in pure Fe-clad MgB2 tape

Abstract: Fe-clad MgB 2 long tapes have been fabricated using a powder-in-tube technique. An Mg+2B mixture was used as the central conductor core and reacted in situ to form MgB 2 . The tapes were sintered in pure Ar at 800°C for 1 h at ambient pressure. SEM shows a highly dense core with a large grain size of 100 μm. The Fe-clad tape shows a sharp transition with transition width of ΔT c of 0.2 K and a T c0 of 37.5 K. We have achieved the highest transport critical current reported so far at 1.7×10 4 A/cm 2 for both 29.5 K in 1 T and 33 K in zero applied field. Resistivity temperature dependence and transport critical current were also measured in magnetic fields applied perpendicular and parallel to the tape plane. Not only is the use of an Fe sheath necessary for the successful processing of in situ reacted powder-in-tube MgB 2 , it confers on the finished wire the additional benefit of magnetic screening.

Association between surgical indications, operative risk, and clinical outcome in infective endocarditis: a prospective study from the International Collaboration on Endocarditis.

Abstract: Background—Use of surgery for the treatment of infective endocarditis (IE) as related to surgical indications and operative risk for mortality has not been well defined. Methods and Results—The International Collaboration on Endocarditis–PLUS (ICE-PLUS) is a prospective cohort of consecutively enrolled patients with definite IE from 29 centers in 16 countries. We included patients from ICE-PLUS with definite left-sided, non–cardiac device–related IE who were enrolled between September 1, 2008, and December 31, 2012. A total of 1296 patients with left-sided IE were included. Surgical treatment was performed in 57% of the overall cohort and in 76% of patients with a surgical indication. Reasons for nonsurgical treatment included poor prognosis (33.7%), hemodynamic instability (19.8%), death before surgery (23.3%), stroke (22.7%), and sepsis (21%). Among patients with a surgical indication, surgical treatment was independently associated with the presence of severe aortic regurgitation, abscess, embolization...

Electric dipole polarizability and the neutron skin

Abstract: The recent high-resolution measurement of the electric dipole ($E1$) polarizability ${\ensuremath{\alpha}}_{\mathrm{D}}$ in ${}^{208}$Pb [A. Tamii et al., Phys. Rev. Lett. 107, 062502 (2011)] provides a unique constraint on the neutron-skin thickness of this nucleus. The neutron-skin thickness ${r}_{\mathrm{skin}}$ of ${}^{208}$Pb is a quantity of critical importance for our understanding of a variety of nuclear and astrophysical phenomena. To assess the model dependence of the correlation between ${\ensuremath{\alpha}}_{\mathrm{D}}$ and ${r}_{\mathrm{skin}}$, we carry out systematic calculations for ${}^{208}$Pb, ${}^{132}$Sn, and ${}^{48}$Ca based on the nuclear density functional theory using both nonrelativistic and relativistic energy density functionals. Our analysis indicates that whereas individual models exhibit a linear dependence between ${\ensuremath{\alpha}}_{\mathrm{D}}$ and ${r}_{\mathrm{skin}}$, this correlation is not universal when one combines predictions from a host of different models. By averaging over these model predictions, we provide estimates with associated systematic errors for ${r}_{\mathrm{skin}}$ and ${\ensuremath{\alpha}}_{\mathrm{D}}$ for the nuclei under consideration. We conclude that precise measurements of ${r}_{\mathrm{skin}}$ in both ${}^{48}$Ca and ${}^{208}$Pb---combined with the recent measurement of ${\ensuremath{\alpha}}_{\mathrm{D}}$---should significantly constrain the isovector sector of the nuclear energy density functional.

Teaching research methodology in medical schools: students' attitudes towards and knowledge about science

Abstract: Objective To explore the relationship between teaching scientific methodology in Year 2 of the medical curriculum and student attitudes towards and knowledge about science and scientific methodology. Design Anonymous questionnaire survey developed for this purpose. Setting Zagreb University School of Medicine, Croatia. Participants A total of 932 students (response rate 58%) from all 6 years were invited to participate. Main outcome measures Score on attitude scale with 45 Likert-type statements and score on knowledge test consisting of 8 multiple choice questions. Results The average attitude score for all students was 166 ± 22 out of a maximum of 225, indicating a positive attitude towards science and scientific research. The students' average score on the knowledge test was 3.2 ± 1.7 on 8 questions. Students who had finished Year 2 had the highest mean attitude (173 ± 24) and knowledge (4.7 ± 1.7) scores compared with other year groups (P < 0.001, anova and Tukey posthoc test). For students who had attended a mandatory Year 2 course on the principles of scientific research in medicine (Years 3 to 6), multiple linear regression analysis showed that knowledge test score (B = 3.4; SE = 0.4; 95% confidence interval 2.5–4.2; P < 0.001) and average grades (B = 7.6; SE = 1.5; 95% CI 4.6–10.6; P < 0.001) were significant predictors of attitude towards science, but not sex or failure to pass a year (B = − 0.6; SE = 1.7; 95% CI − 3.9–2.6; P = 0.707; and B = − 3.1; SE = 1.9; 95% CI − 6.8–5.7; P = 0.097, respectively). Conclusion Medical students have generally positive attitudes towards science and scientific research in medicine. Attendance of a course on research methodology is related to a positive attitude towards science.