The role of E1-E2 interplay in multiphonon Coulomb excitation

In this work we study the problem of a charged particle, bound in a harmonic-oscillator potential, being excited by the Coulomb field from a fast charged projectile. Based on a classical solution to the problem and using the squeezed-state formalism we are able to treat exactly both dipole and quadrupole Coulomb field components. Addressing various transition amplitudes and processes of multiphonon excitation we study different aspects resulting from the interplay between E1 and E2 fields, ranging from classical dynamic polarization effects to questions of quantum interference. We compare exact calculations with approximate methods. Results of this work and the formalism we present can be useful in studies of nuclear reaction physics and in atomic stopping theory.Comment: 10 pages, 6 figure

Degradation of Topciderska River Water Quality (Belgrade)

In this paper a study of degradation of water quality of Topciderska River has been shown. Topciderska River flows through Belgrade city nucleus and presents one of the most polluted rivers in this area, which joins to Sava river upwards from confluence of Sava and Danube. Various techniques have been used such as Ion chromatography (IC), Inductively coupled plasma emission spectroscopy (ICP-OES) and measurements, conductonetis and phisical parametars. Anions were analysed with ion chromatography and cations were determined with ICP-OES. The chosen locations in which sampling was done are situated in lower part of Topciderska river. Sediment, as the larges strorage and resorces of heavy metal (HM), plays a rather important role in metal transformations. The pH and HM can directly change metals distribution in sediment; however temperature and conductivity, mainly through changing the pH values, indirectly alters metals distribution. This river is one of the most polluted urban flows in Serbia. It represents good example for studying hydrologic changes influenced by social processes

Natural Hazard Assessment for Land-use Planning in Serbia. International journal of environmental research

ABSTRACT: The territory of Serbia is vulnerable to various types of natural hazards and the risk is not equal across the entire territory; it varies depending on the type of hazard and the expected potential for damage. The first aim of this research was to determine the geographical distributions of the major types of natural hazards. Seismic hazards, landslides, rock falls, floods, torrential floods, excessive erosion, droughts and forest fires are the most significant natural hazards within the territory of Serbia. Areas vulnerable to some of these natural hazards were singled out using analytical maps; their area relative to the total area of Serbia was defined, along with the total surface area that is vulnerable to each type of natural hazard. Upper intensity values for single natural hazards were measured; these values represent the limiting factor for land-use planning at the given level. Based on these analyses, an integral map of the natural hazards of the territory was created using multi-hazard assessment. Hence, a recent state of the natural hazard vulnerabilities of the territory of Serbia was created and then an integral map was made. The integral map showed spatial distribution of the different types of hazards that are considered to be limiting factors for the highest level of land-use planning. The results presented in this article are the first multi-hazard assessment and the first version of the integral map of natural hazards distribution in Serbia for land-use planning, which is important both nationally and regionally

Germline VHL gene mutations in three Serbian families with von Hippel-Lindau disease

Von Hippel-Lindau (VHL) disease is an autosomal dominantly inherited cancer predisposition syndrome due to germline mutations in the VHL tumor suppressor gene which is associated with virtually complete penetrance. The VHL syndrome has a highly variable phenotypic expressivity including retinal and CNS haemanioblastomas, pheochromocytomas, renal clear cell carcinomas, and multifocal cysts. In order to establish VHL gene testing, we analyzed three families affected by VHL disease, using SSCP mutation screening and DNA sequencing. Among 18 family members with and without clinical manifestations, eight cases with germline VHL mutations were detected. In family A, a c.490G GT T/ p.Gly93Cys substitution was found. In family 13, with pheochromocytoma only phenotype, we detected a previously not described c.463G GT A/p.Val84Met replacement. Within this family, a prenatal diagnosis was also performed. Affected members of the third family with a VHL type I disease carried a c.475T GT C/p.Trp88Arg exchange. All these mutations were located in exon 1 of the VHL tumor suppressor gene. Alterations in this hydrophobic region of the core beta domain of the VHL protein are known to have a variety of phenotypic consequences. We observed also intrafamiliar variation in time of onset and severity of the disease