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Search Results: 1 - 3 of 3 matches for " Hadzovic Djani "
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Valvular heart disease in patients undergoing chronic hemodialysis
Loncar Daniela,Tabakovic Mithat,Mulic-Bacic Suada,Hadzovic Djani
Cardiologia Croatica , 2013,
Abstract: Valvular heart disease is a common phenomenon in patients undergoing chronic hemodialysis. Abnormalities include valvular and annular thickening and calcification of any of the heart valves, causing regurgitation and/or stenosis. Valvular thickening or sclerosis in patients undergoing chronic dialysis treatment usually affects the aortic and mitral valve. Aortic valve calcification is recorded in up to a half of hemodialyzed patients, occurring from 10 to 20 years earlier than in the general population. Valvular regurgitation occurs mostly in mitral, tricuspid and less commonly in aortic valve. The aim of the article was to determine the incidence of valvular heart disease in asymptomatic patients undergoing chronic dialysis.The analysis involves a total of 50 patients, of whom 35 (70%) are treated by hemodialysis and 15 (30%) by continuous ambulatory peritoneal dialysis. Valvular thickening or sclerosis was diagnosed in 20 (40%) patients. Sclerosis of mitral cusps was diagnosed in 9 (18%) patients and sclerosis of aortic cusps was diagnosed in 11 (22%) patients. Heart valve calcifications were diagnosed in 12 (31%) patients. Mild aortic stenosis was present in 3 (6%) patients. Mitral regurgitation was diagnosed in 38 (76%) patients, aortic regurgitation in 14 (28%), and tricuspid regurgitation in 24 (48%) patients.The evaluation of the valve apparatus for all patients undergoing chronic dialysis program requires echocardiographic examination that is to be performed, considering the high prevalence of valvular heart diseases.
First principles characterization of the P2_1ab ferroelectric phase of Bi2WO6
Hania Djani,Patrick Hermet,Philippe Ghosez
Physics , 2014,
Abstract: The structural, dielectric, dynamical, elastic, piezoelectric and nonlinear optical (second-order susceptibility and Pockels tensors) properties of Bi2$WO6 in its P2_1ab ferroelectric ground state are determined using density functional theory. The calculation of infrared and Raman spectra on single crystal allowed us to clarify the assignment of experimental phonon modes, considering the good agreement between the calculated and the experimental Raman spectra obtained on polycrystal. The calculation of the elastic constants confirms the elastic stability of the crystal and allow us to estimate the Young and shear moduli of polycrystalline samples. The piezoelectric constants have significant intrinsic values comparable to those of prototypical ABO3 ferroelectrics. The electro-optic response is strongly dominated by the ionic contribution of transverse optic modes, yielding sizable Pockels coefficients around 9 pm/V along the polar direction.
First-principles study of the ferroelectric Aurivillius phase Bi2WO6
Hania Djani,Eric Bousquet,Abdelhafid Kellou,Philippe Ghosez
Physics , 2012, DOI: 10.1103/PhysRevB.86.054107
Abstract: In order to better understand the reconstructive ferroelectric-paraelectric transition of Bi2WO6, which is unusual within the Aurivillius family of compounds, we performed first principles calculations of the dielectric and dynamical properties on two possible high-temperature paraelectic structures: the monoclinic phase of A2/m symmetry observed experimentally and the tetragonal phase of I4/mmm symmetry, common to most Aurivillius phase components. Both paraelectric structures exhibits various unstable modes, which after their condensation bring the system toward more stable structures of lower symmetry. The calculations confirms that, starting from the paraelectric A2/m phase at high temperature, the system must undergo a reconstructive transition to reach the P2_1ab ferroelectric ground state.
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