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Search Results: 1 - 10 of 2226 matches for " Milan Dragovi? "
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Season of birth and handedness in Serbian high school students
Sanja Milenkovi?, Daniel Rock, Milan Dragovi, Aleksandar Janca
Annals of General Psychiatry , 2008, DOI: 10.1186/1744-859x-7-2
Abstract: We have investigated the effect of season of birth in an epidemiologically robust sample of randomly selected young people (n = 977), all born in the same year. A Kolmogorov-Smirnov type statistical test was used to determine season of birth.Neither the right-handed nor the non-right-handed groups demonstrated birth asymmetry relative to the normal population birth distribution. There was no between-group difference in the seasonal distribution of birth when comparing the right-handed to the non-right-handed groups.The present study failed to provide support for a season of birth effect on atypical lateralisation of handedness in humans.Functional dominance of the right hand is the norm across different populations, various geographical regions, and diverse cultures, with approximately 90% of humans exhibiting clear dominance of the right side of the body. This behavioural characteristic is considered as uniquely human, as there is no other species that displays such a large behavioural asymmetry at the population level. It is also widely accepted that this behavioural feature emerged at some point during the hominid evolution, and that this feature preceded the evolution of another uniquely human feature – language, and in particular, speech as its central component [1].The transmission of handedness over many generations of humans is widely believed to be under genetic control [2-4], rather than resulting from learning. Converging lines of evidence provide support for the genetic hypothesis, including imaging studies on twins [5], meta-analysis of handedness in twins [6], and molecular genetic studies [7,8]. To date, however, no gene for handedness has been identified. Genetic models of handedness [2,3] argue that the functional advantage of the right hand originates from a purely genetic effect, while left-handedness is a consequence of a random shift in hand dominance. Theory suggests that in individuals without the genetic disposition, both cerebral and hand do
Population doses from terrestrial gamma exposure in Serbia
Dragovi? Sne?ana,Jankovi?-Mandi? Ljiljana,Mom?ilovi? Milan,Onjia Antonije
Archive of Oncology , 2007, DOI: 10.2298/aoo0704078d
Abstract: Background: Terrestrial radiation emitted from naturally occurring radionuclides, such as 40K and radionuclides from the 238U and 232Th series and their decay products represent the main external source of irradiation to the human body. The purpose of this study was to provide a preliminary assessment of the doses from terrestrial exposure of population in Serbia and to estimate a potential radiation hazard for population inhabiting investigated areas. Methods: The gamma dose rates, external hazard indexes, and annual effective doses due to terrestrial naturally occurring radionuclides (238U, 232Th and 40K) were calculated based on their activities in soil samples in Serbia as determined by gamma-ray spectrometry. Results: The total absorbed gamma dose rate due to these radionuclides varied from 16.9 to 125 nGy h-1, with a mean of 62.8 nGy h-1. Assuming a 20% occupancy factor, the corresponding annual effective dose varied from 2.07 to 15.4×10-5 Sv with the mean value of 7.7×10-5 Sv, i.e. annual effective dose was in range of the world wide average values. Conclusion: According to the values of external hazard index obtained in this study (mean Hex = 0.35), the radiation hazard was insignificant for the population living in investigated areas.
Reversal deterioration of renal function accompanied with primary hypothyrodism
Dragovi? Tamara
Vojnosanitetski Pregled , 2012, DOI: 10.2298/vsp1202205d
Abstract: Introduction. Hypothyroidism is often accompanied with decline of kidney function, or inability to maintain electrolyte balance. These changes are usually overlooked in everyday practice. Early recognition of this association eliminates unnecessary diagnostic procedures that postpone the adequate treatment. Case report. Two patients with elevated serum creatinine levels due to primary autoimmune hypothyroidism, with complete recovery of creatinine clearance after thyroid hormone substitution therapy are presented. The first patient was a young male whose laboratory tests suggested acute renal failure, and the delicate clinical presentation of reduced thyroid function. The second patient was an elderly woman with a history of a long-term signs and symptoms attributed to ageing, including the deterioration of renal function, with consequently delayed diagnosis of hypothyroidism. Conclusion. Serum thyrotropin and thyroxin levels measurement should be done in all cases of renal failure with undefined renal desease, even if the typical clinical presentation of hypothyroidism is absent. Thyroid hormone assays sholud also be performed in all patients with chronic kidney disease whose kidney function is rapidly worsening.
Uticaj metaboli ke kontrole na nastanak i razvoj bubre ne lezije u e ernoj bolesti
Dragovi? Tamara
Vojnosanitetski Pregled , 2002, DOI: 10.2298/vsp0203293d
O stvarala kom traganju Dje je i lutkarske scene HNK u Vara dinu
Spomenka Dragovi
Radovi Zavoda za Znanstveni Rad Vara?din , 2007,
Abstract: Nakana je rada - pregledom repertoara, te osvrtom na praizvedbe predstava Dje je i lutkarske scene vara dinskoga HNK – ukazati na specifi nosti estetike Scene, kao i zna aj njena djelovanja u vara dinskome kazali nom ivotu, a i ire.U kreiranju autenti nog kazali nog izraza – nerijetko spoja umjetni koga htjenja i nu nog oslu kivanja imperativa prakse – Dje ja i lutkarska scena je u proteklih dvanaest godina postala sukreatorom vara dinskoga kazali nog repertoara i dijelom vara dinskoga kazali nog svakodnevlja, ali i relevantnom injenicom u ivotu hrvatskoga teatra danas
Microalbuminuria in diabetes: Definition, identification techniques, and the significance of early recognition
Dragovi? Tamara
Vojnosanitetski Pregled , 2006, DOI: 10.2298/vsp0612027d
Pseudo-integrable billiards and arithmetic dynamics
Vladimir Dragovi,Milena Radnovi?
Physics , 2012,
Abstract: We introduce a new class of billiard systems in the plane, with boundaries formed by finitely many arcs of confocal conics such that they contain some reflex angles. Fundamental dynamical, topological, geometric, and arithmetic properties of such billiards are studied. The novelty, caused by reflex angles on boundary, induces invariant leaves of higher genera and dynamical behaviour different from Liouville-Arnold's theorem. Its analogue is derived from the Maier theorem on measured foliations. A local version of Poncelet theorem is formulated and necessary algebro-geometric conditions for periodicity are presented. The connection with interval exchange transformation is established together with Keane's type conditions for minimality. It is proved that the dynamics depends on arithmetic of rotation numbers, but not on geometry of a given confocal pencil of conics.
Systems of Kowalevski type, discriminantly separable polynomials and quad-graphs
Vladimir Dragovi,Katarina Kuki?
Mathematics , 2011,
Abstract: We establish a new class of integrable {\it systems of Kowalevski type}, associated with discriminantly separable polynomials of degree two in each of three variables. Defining property of such polynomials, that all discriminants as polynomials of two variables are factorized as products of two polynomials of one variable each (denote one of the polynomial components as $P$), lead to an effective integration procedure. In the motivating example, the celebrated Kowalevski top, the discriminant separability is a property of the polynomial defining the Kowalevski fundamental equation. We construct several new examples of systems of Kowalevski type, and we perform their explicit integration in genus two theta-functions. One of the main tasks of the paper is to classify such discriminantly separable polynomials. Our classification is based on the study of structures of zeros of a polynomial component $P$ of a discriminant. From a geometric point of view, such a classification is related to the types of pencils of conics. We construct also discrete integrable systems on quad-graphs associated with discriminantly separable polynomials. We establish a relationship between our classification and the classification of integrable quad-graphs which has been suggested recently by Adler, Bobenko and Suris. As a fit back, we get a geometric interpretation of their results in terms of pencils of conics, and in the case of general position, when all four zeros of the polynomial $P$ are distinct, we get a connection with the Buchstaber-Novikov two-valued groups on $\mathbb {CP}^1$.
New Examples of Systems of the Kowalevski Type
Vladimir Dragovi,Katarina Kuki?
Mathematics , 2011, DOI: 10.1134/S1560354711050054
Abstract: A new examples of integrable dynamical systems are constructed. An integration procedure leading to genus two theta-functions is presented. It is based on a recent notion of discriminantly separable polynomials. They have appeared in a recent reconsideration of the celebrated Kowalevski top, and their role here is analogue to the situation with the classical Kowalevski integration procedure.
Model of an Atom by Analogy with the Transmission Line  [PDF]
Milan Perkovac
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.47121

Model of an atom by analogy with the transmission line is derived using Maxwells equations and Lorentz theory of electrons. To be realistic such a model requires that the product of the structural coefficient of Lechers transmission lines σ and atomic number Z is constant. It was calculated that this electromechanical constant is 8.27756, and we call it structural constant. This constant builds the fine-structure constant 1/α = 137.036, and with permeability μ, permittivity ε and elementary charge e builds Plank’s constant h. This suggests the electromagnetic character of Planck’s constant. The relations of energy, frequency, wavelength and momentum of electromagnetic wave in an atom are also derived. Finally, an equation, similar to Schrodinger’s equation, was derived, with a clear meaning of the wave function, which represents the electric or magnetic field strength of the observed electromagnetic wave.

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