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Search Results: 1 - 10 of 1087 matches for " Barud?ija Tanja "
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Structural and magnetic properties of mechanochemically synthesized nanosized yttrium titanate
Barudija Tanja,Gusev Alexey A.,Jugovi? Dragana,Marinovi?-Cincovi? Milena
Hemijska Industrija , 2012, DOI: 10.2298/hemind111103103b
Abstract: Nanosized perovskite YTiO3 with the mean crystallite size of 18 nm was synthesized for the first time by mechanochemical treatment. The mechanochemical solid state reaction between commercial Y2O3 powder and mechanochemically synthesized TiO powder in molar ratio 0.5:1 was completed for 3 h in a high-energy planetary ball mill in argon atmosphere. The heating in vacuum at 1150 °C for 12 h transforms nanosized YTiO3 to a well-crystallized single-phase perovskite YTiO3. Both samples were characterized by X-ray diffraction (XRD) and thermogravimetric (TGA/DTA) analyses, as well as superconducting quantum interference device magnetometer (SQUID) measurements.
Structural and magnetic properties of mechanochemically synthesized nanocrystalline titanium monoxide
Barudija Tanja,Gusev Alexey A.,Jugovi? Dragana,Drami?anin Miroslav
Hemijska Industrija , 2012, DOI: 10.2298/hemind111027090b
Abstract: Nano-sized titanium monoxide (TiO) powder was prepared by mechanochemical synthesis. A mixture of commercial Ti and TiO2 (rutile) powders with the molar ratio of 1:1 was milled in a planetary ball mill for 5, 10, 20, 30 and 60 min under argon atmosphere. The final single-phase titanium monoxide sample was characterized by X-ray diffraction (XRD), magnetic measurements using a superconducting quantum interference device magnetometer (SQUID) and thermogravimetric analysis (TGA). The temperature dependency of the magnetic susceptibility is characterized by significant contribution of Pauli paramagnetism due to conduction electrons.
Nata?a Jug,Uro? Barudija,Goran Durn
Rudarsko-Geolo?ko-Naftni Zbornik , 2008,
Abstract: The purpose of this study is to present the field and laboratory researches, statistical analyses and graphical displays of the results of Hg soil gas and Hg soil distribution in the area around former mining site Zrinski“ on Mt. Medvednica. The values of overall Hg concentrations in the soil gas show lognormal distribution, and their spatial distribution outlines the connection with the present Pb-Ag-Zn mineralization and confirms anthropogenic origin of uneven landscape relief (waste rock clusters). Regression analysis of the dependence between Hg contents in the soil gas and the distance from the mine entrance (correlation coefficient r) also points to the considerable spatial dependence. Hg soil contents show as well distribution similar to lognormal, and there is a slight correlation when compared with Hg soil gas content. Concentrations are mostly within background values, except in the immediate vicinity of the mine entrance where the values are significantly higher due to the mineralization influence concentrated in the waste-rock clusters. Soil pollution caused by mercury is of local character with the spreading tendency to the south-west because of the dominant relief influence. Mercury found in the soil of the research location derives from the present mineral body and former mining activities, while possible anthropogenic atmospheric inputs from remote sources can not be proven on the basic of conducted research studies.
Teaching PCA through Letter Recognition  [PDF]
Tanja Van Hecke
Creative Education (CE) , 2011, DOI: 10.4236/ce.2011.23040
Abstract: This article presents the use of a real life problem to reach a deeper understanding among students of the benefits of principal components analysis. Pattern recognition applied on the 26 letters of the alphabet is a recognizable topic for the students. Moreover it is still verifiable with computer algebra software. By means of well defined exercises the student can be guided in an active way through the learning process.
Influence of Random Pinning on the Crystallization Process in Suspensions of Hard Spheres  [PDF]
Sven Dorosz, Tanja Schilling
Journal of Crystallization Process and Technology (JCPT) , 2014, DOI: 10.4236/jcpt.2014.42012
Abstract: We discuss crystal formation in supersaturated suspensions of monodisperse hard spheres with a concentration of hard spheres randomly pinned in space and time. The pinning procedure introduces an external length scale and an external time scale that restrict the accessible number of configureurations and ultimately the number of pathways leading to crystallization. We observe a significant drop in the nucleation rate density at a characteristic pinning concentration that can be directly related to the structure of the critical nucleus and the dynamics of its formation in the unpinned system.
QCD Originated Dynamical Symmetry for Hadrons
Djordje ?ija?ki
Physics , 1993,
Abstract: We extend previous work on the IR regime approximation of QCD in which the dominant contribution comes from a dressed two-gluon effective metric-like field $G_{\mu\nu} = g_{ab} B^{a}_{\mu} B^{b}_{\nu}$ ($g_{ab}$ a color SU(3) metric). The ensuring effective theory is represented by a pseudo-diffeomorphisms gauge theory. The second -quantized $G_{\mu\nu}$ field, together with the Lorentz generators close on the $\bar{SL}(4,R)$ algebra. This algebra represents a spectrum generating algebra for the set of hadron states of a given flavor - hadronic "manifields" transforming w.r.t. $\bar{SL}(4,R)$ (infinite-dimensional) unitary irreducible representations. The equations of motion for the effective pseudo-gravity are derived from a quadratic action describing Riemannian pseudo-gravity in the presence of shear ($\bar{SL}(4,R)$ covariant) hadronic matter currents. These equations yield $p^{-4}$ propagators, i.e. a linearly rising confining potential $H(r) \sim r$, as well as linear $J \sim m^{2}$ Regge trajectories. The $\bar{SL}(4,R)$ symmetry based dynamical theory for the QCD IR region is applied to hadron resonances. All presently known meson and baryon resonances are successfully accommodated and various missing states predicted. (Lectures presented at the Danube Workshop '93, June 1993, Belgrade, Yugoslavia.)
Level of knowledge about sexually transmitted infections in the population of female students at the University of Novi Sad
Nikoli? Svetlana,Kapamad?ija Aleksandra
Medicinski Pregled , 2011, DOI: 10.2298/mpns1102084n
Abstract: Introduction. The reason for extremely high incidence of sexually transmitted infections is the lack of necessary knowledge about the mode of transmission and protection measures. The aim of this study was to determine the level of knowledge about sexually transmitted infections in the population of female students of the University of Novi Sad. Material and methods. The study included 397 female students at the University of Novi Sad from different faculties. A questionnaire was designed for the purpose of this research. Results and discussion. Students from all faculties (55.7-66.7%), with the exception of the medical students, believe that the use of condoms is the safest way of protection from sexually transmitted infections. The medical students showed a different attitude and opinion on the use of condoms and avoidance of multiple sexual partners, which are important measures in the prevention of these diseases (38. 8%). The fact that some sexually transmitted infections caused by viruses are associated with the malignancy of the cervix was recognized by 74.81% of students. The fact that the main therapeutic approach for treatment of sexually transmitted diseases is the simultaneous treatment of both partners was known by 81.86% of female students. As it is known, sexually transmitted infections may not always be symptomatic, which is an opinion held by 73.55% of students. Conclusion. Results obtained in this study indicate the need for implementation of educational activities about sexually transmitted infections, which would enable the preservation and promotion of reproductive health of young people.
The importance of antibiotic residues presence detection in milk
Dubravka Samar?ija,Neven Antunac
Mljekarstvo , 2002,
Abstract: Antibiotic residues are the most present inhibitory substances in milkhaving undesirable effect on human health, technological characteristics and the quality of milk and dairy products. In order to protect consumer's health and to ensure high quality milk production, European Union (EU) regulation 2377/90 sets a maximum permitted levels for antibiotic residues in milk. Although the presence of antibiotic residues in milk can be due to animal diseases treatment, and in the case of milking animals, they are mostly present after mastitis treatment. The aim of this work is to stress the importance of the continuous control on antibiotic residues presence in milk, due to the role that milk and dairy products have in human nutrition. In this paper, different groups of antibiotics, mechanisms of theirs action, mistakes occurring in dairy products manufacture as well as the methods for theirs detection are described.
Quality marks: protected denomination of origin (pdo), protected geographical indication (pgi) and traditional speciality guaranteed (tsg) as social and economic impact on the local cheese production
Dubravka Samar?ija,Neven Antunac
Mljekarstvo , 2002,
Abstract: In July 1993, the European Community Regulation (EEC): ProtectedDenomination of Origin (PDO) and Protected Geographical Indication (PGI) No. 2081/92 came into force. This Regulation has set up the criteria, which are needed for protection of geographical indications and designations of origin for agricultural products and foodstuffs. The Regulation has been extended (Regulation EEC No. 1804/99) to the products, which specific features are due to a production method or traditional composition without any link with a particular area (TSG). According to the Regulation, countries outside the European Community have also been given an opportunity to formally recognise and to protect their own specific products under the concept of Protected Designation of Origin (PDO), Protected Geographical Indication (PGI) and Traditional Speciality Guaranteed (TSG). Since then, among EU countries, France, Italy, Spain and Greece have succeeded to protect the highest number of their own traditional cheeses. The total number of PDO and PGI cheeses, registered by the European Committee, are 128 and 10 respectively (Ba r jo l l e and S y l va n de r , 2000). It is worth to stress that PDO/PGI/TSG policy is much more than economic success. This is a strategy that encourages a number of social, environmental and cultural benefits. Law on the protection of geographical indications of products and service (The Official Gazette 78/99) has been already adopted in Croatia. However, nothing has been done to protect cheeses under the Europeans requirements. In that respect, if Croatia really wants to protect their unique cheese varieties against the misuse and imitation, the framework of regulations has to be very close to the proposition adopted by the EU. This report is based on the experience of other countries in the implementation of the concept of the legislation necessity to develop an effective system of cheese protection under EU Regulations 2081/92 and 1804/1999.
Review on international conference: 6th International conference: Economic integrations, competition and cooperation
Vinko Kand?ija,Alen Host
Zbornik Radova Ekonomskog Fakulteta u Rijeci : ?asopis za Ekonomsku Teoriju i Praksu , 2007,
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