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Search Results: 1 - 10 of 590 matches for " Vanja Nikolic "
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On higher regularity for the Westervelt equation with strong nonlinear damping
Vanja Nikolic,Barbara Kaltenbacher
Mathematics , 2015,
Abstract: We show higher interior regularity for the Westervelt equation with strong nonlinear damping term of the $q$-Laplace type. Secondly, we investigate an interface coupling problem for these models, which arise, e.g., in the context of medical applications of high intensity focused ultrasound in the treatment of kidney stones. We show that the solution to the coupled problem exhibits piecewise $H^2$ regularity in space, provided that the gradient of the acoustic pressure is essentially bounded in space and time on the whole domain. This result is of importance in numerical approximations of the present problem, as well as in gradient based algorithms for finding the optimal shape of the focusing acoustic lens in lithotripsy.
Sensitivity analysis for shape optimization of a focusing acoustic lens in lithotripsy
Vanja Nikolic,Barbara Kaltenbacher
Mathematics , 2015,
Abstract: We are interested in shape sensitivity analysis for an optimization problem arising in medical applications of high intensity focused ultrasound. The goal is to find the optimal shape of a focusing acoustic lens so that the desired acoustic pressure at a kidney stone is achieved. Coupling of the silicone acoustic lens and nonlinearly acoustic fluid region is modeled by the Westervelt equation with nonlinear strong damping and piecewise constant coefficients. We follow the variational approach to calculating the shape derivative of the cost functional which does not require computing the shape derivative of the state variable; however assumptions of certain spatial regularity of the primal and the adjoint state are needed to obtain the derivative, in particular for its strong form according to the Delfour-Hadamard-Zol\' esio Structure Theorem.
Efficient time integration methods based on operator splitting and application to the Westervelt equation
Barbara Kaltenbacher,Vanja Nikolic,Mechthild Thalhammer
Mathematics , 2013,
Abstract: Efficient time integration methods based on operator splitting are introduced for the Westervelt equation, a nonlinear damped wave equation that arises in nonlinear acoustics as mathematical model for the propagation of sound waves in high intensity ultrasound applications. For the first-order Lie-Trotter splitting method a global error estimate is deduced, confirming that the splitting method remains stable and that the nonstiff convergence order is retained in situations where the problem data are sufficiently regular. Fundamental ingredients in the stability and error analysis are regularity results for the Westervelt equation and related linear evolution equations of hyperbolic and parabolic type. Numerical examples illustrate and complement the theoretical investigations.
Città in mostra. Parma 1870, immagine debole di un potere in crisi
Vanja Strukelj
Ricerche di S/Confine , 2010,
Abstract: In 1870 in Parma there were a series of cultural manifestations which would attract the attention of thenation to the town. Besides the inauguration of the Correggio monument, there was the “Primo Congresso Artistico Italiano” and the “Esposizione d’Arti Belle”, and also an “Esposizione Provinciale Industriale e Agricola”. The ex petite capitale had the chance to reaffirm, in the new Unitarian context, its historical and cultural identity, of which the artistic tradition became an important element. Pietro Martini, the Academy’s secretary, was the creator and director of the project which envisaged these enterprises as opportunities for raising the profile of an institution which was passing through a crisis. This article wishes to show the complexity and ambitious scope of a project which was, at the sametime to represent a national model, but also the inadequacy of a promotional system which, withoutusing the instruments of modern communication and, in particular, images, would lower the impact, even symbolic, of the initiative itself.
Prikaz skupa- POVIJEST SOCIJALNE POLITIKE, SOCIJALNOG RADA I OBRAZOVANJA ZA SOCIJALNI RAD U SLOVENIJI
Vanja Branica
Ljetopis Studijskog Centra Socijalnog Rada , 2006,
Abstract:
MOGU I PRISTUP RODU I SPOLU U SOCIJALNOM RADU
Vanja Branica
Ljetopis Studijskog Centra Socijalnog Rada , 2004,
Abstract: Suvremeni trendovi u obrazovanju socijalnih radnika isti u potrebu za obrazovanjem koje uklju uje rodno/spolna pitanja i perspektivu. Stoga su nastavnice i asistentice Studijskog centra socijalnog rada sudjelovale na dva seminaru pod nazivom “Gender Issues in Social Work”, koji su se odr ali tijekom 2003. godine u ukupnom trajanju od est dana. Cilj seminara bio je educirati i senzibilizirati polaznice za pitanje spola i roda u radu socijalnih radnika, te pokrenuti razmi ljanja i ideje o integriranju tog sadr aja u obrazovni program Studijskog centra socijalnog rada kao prvu stepenicu za stvaranje rodno/spolno senzibiliziranog curiculumma. Evaluacija seminara pokazala je da su sudionice bile zadovoljne seminarom, njegovim sadr ajem i organizacijom. U radu se daje prikaz sadr aja seminara koji je podijeljen u dvije cjeline. Prvi dio odnosi se na proces socijalizacije i njegov utjecaj na formiranje identiteta ene. Tako er govori o raspodjeli mo i izme u mu karaca i ena. U drugom dijelu navodi se nekoliko smjernica za rad socijalnih radnika sa enama.
Prikaz skupa: SOCIJALNA SKRB ZA VRIJEME SOCIJALIZMA (1945.–1990.)
Branica Vanja
Ljetopis Studijskog Centra Socijalnog Rada , 2008,
Abstract:
Prikaz skupa- MRE A ZA POVIJESNE STUDIJE SPOLA I SOCIJALNOG RADA Queen’s University, Belfast, Northern Ireland 11-12. kolovoz, 2003.
Vanja Branica
Ljetopis Studijskog Centra Socijalnog Rada , 2003,
Abstract:
RAZVOJ DRU TVENE SKRBI ZA DJECU U PRVOJ POLOVINI 20. STOLJE A
Vanja Branica
Ljetopis Studijskog Centra Socijalnog Rada , 2006,
Abstract: Nastoje i istra iti povijest profesionalnog djelovanja socijalnih radnika u podru ju javne skrbi za djecu, potrebno je za po etak istra iti razli ite oblike intervencija kojima je dru tvo, a kasnije i dr ava nastojalo skrbiti za djecu. Rad je posve en aktivnostima kojima su dru tvo i dr ava skrbili za djecu u razdoblju od 1900. – 1940. godine. Naglasak je stavljen na institucionalne oblike intervencija. U prvom dijelu rada obrazlo eni su osnovni pojmovi koje upotrebljavamo raspravljaju i o skrbi za djecu iz perspektive dana njice usporedno s perspektivom istaknutih mislilaca iz promatranog razdoblja.U drugom dijelu rada predstavljeni su rezultati istra ivanja na izvornoj arhivskoj gra i i publikacijama o dje jim domovima, tj. ustanovama u okviru kojih se pru ala skrb za djecu. U zavr nom dijelu rada prikazane su i obrazlo ene okolnosti ja anja dr avne intervencije u podru ju skrbi za djecu.
Structural conditions within Sava Fault zone in the Western Karavanke mountains, NW Slovenia
Vanja Kastelic
Geologija , 2007,
Abstract: The investigated area of Western Karavanke lies in the zone of Sava Fault – the southern most part of the Periadriatic Fault zone. The work is based on detail structural mapping of the fault zones combined with measurements of microtectonic data used for paleostress tensor inversion. The prevailing orientation of fault zones in the studied area is generally E–W oriented with steep dips towards N with strike-slip kinematics as the main slip sense recorded on them. Alongside horizontal deformation, records of vertical movements on these faults are also to be seen in the field and the inversion data confirm such kinematic style with compressional stress regime. Two systems of connecting faults that lie between two strands of E–W oriented faults are also present in the studied area. Along both of them blocks of more deformable rocks were extruded on more rigid rock units. I connect the age of this style of deformation to post-collisional processes connected to Alpine orogenesis, and recent earthquakes in the area prove the ongoing active deformation of the area.
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