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The study of the natural characteristics of the basin as a function of forecasting erosion and deposition processes on the example of the selected basin
Nikoli? Jugoslav,NikoliMilena,Nikoli? ?or?e
Journal of the Geographical Institute Jovan Cvijic, SASA , 2012, DOI: 10.2298/ijgi1202015n
Abstract: For an integral perception of the possibility of forecasting erosion-deposition processes and their consequences it is essential to analyze the factors of erosion and deposition. The attempt was made in the paper to analyze quantitative and qualitative impact of some of the most important factors of erosion-deposition processes. The analysis was performed through a multidisciplinary approach, on the example of the Zapadna Morava River upper basin. The methodology of research encompasses an application of the adequate knowledge from the areas of meteorology, geomorphology, hydrogeology, spatial planning, economic geography, forestry, hydrology and environmental protection. The analysis encompasses meteorological factors, terrain characteristics and anthropogenic factors. The importance of the analysis and forecasts of the investigated processes for the industry, economy, spatial planning and environmental protection was emphasized.
Testing of residual monomer content reduction possibility on acrilic resins quality
Kosti? Milena,Kruni? Neboj?a,Nikoli? Ljubi?a,Nikoli? Vesna
Hemijska Industrija , 2011, DOI: 10.2298/hemind101103008k
Abstract: Poly (methyl methacrylate) (PMMA) is material widely used in dentistry. Despite the various methods used to initiate the polymerization of acrylic resins, the conversion of monomer to polymer is not complete thus leaving some unreacted methyl methacrylate (MMA), known as residual monomer (RM), in denture structure. RM in dental acrylic resins has deleterious effects on their mechanical properties and their biocompatibility. The objective of the work was to test the residual monomer reduction possibility by applying the appropriate postpolymerization treatment as well as to determine the effects of this reduction on pressure yields stress and surface structure characteristics of the acrylic resins. Postpolymerization treatments and water storage induced reduction of RM amount in cold-polymerized acrylic resins improved their mechanical properties and the homogenized surface structure. After the polymerization of heat-polymerized acrylic resins the post-polymerization treatments for improving the quality of this material type are not necessary.
Residual monomer content determination in some acrylic denture base materials and possibilities of its reduction
Kosti? Milena,Kruni? Neboj?a,Nikoli? Ljubi?a,Nikoli? Vesna
Vojnosanitetski Pregled , 2009, DOI: 10.2298/vsp0903223k
Abstract: Background/Aim. Polymethyl methacrylate is used for producing a denture basis. It is a material made by the polymerization process of methyl methacrylate. Despite of the polymerization type, there is a certain amount of free methyl methacrylate (residual monomer) incorporated in the denture, which can cause irritation of the oral mucosa. The aim of this study was to determine the amount of residual monomer in four different denture base acrylic resins by liquid chromatography and the possibility of its reduction. Methods. After the polymerization, a postpolymerization treatment was performed in three different ways: in boiling water for thirty minutes, with 500 W microwaves for three minutes and in steam bath at 22o C for one to thirty days. Results. The obtained results showed that the amount of residual monomer is significantly higher in cold polymerizing acrylates (9.1-11%). The amount of residual monomer after hot polymerization was in the tolerance range (0.59- 0.86%). Conclusion. The obtained results denote a low content of residual monomer in the samples which have undergone postpolymerization treatment. A lower percent of residual monomer is established in samples undergone a hot polymerization.
Journal of Special Education and Rehabilitation , 2013, DOI: 10.2478/v10215-011-0030-6
Abstract: The purpose of the research was to see whether work of special educators and rehabilitators in the regular school has a positive influence on peer relationship among students with delayed cognitive development.The accent was on friendship quality, social competence and antisocial behavior. The research comprised 150 students with slow cognitive development, 52 of who have support of special educators and rehabilitators in regular education, while the remaining 98 students are without support. Friendship quality was evaluated applying Friendship Quality Questionnaire. School Social Behavior Scale was used in order to evaluate social competence and antisocial behavior. Differences among the groups were examined by t-test from SPSS 14 Windows software package.The results have shown that students with slow cognitive development having support from special educators and rehabilitators evaluate their friendship more qualitative. Students with delayed cognitive development attending schools without special educators and rehabilitators engaged demonstrate better level of the social competence. As far as antisocial behavior concerns, no differences were found. The results obtained indicate need for redefining the role of special educators and rehabilitators in regular primary education.
Changes in population dynamics of Ra ka region
Penji?evi? Ivana,NikoliMilena M.
Journal of the Geographical Institute Jovan Cvijic, SASA , 2011, DOI: 10.2298/ijgi1103081p
Abstract: The basic characteristics of natural increase and migration of the population are being analyzed in this research, with the aim to establish the level of demographic transition in the Ra ka region in the beginning of 21st century. In the period (1961 - 2002), changes of natural increase are reflecting in the decreasing of birth-rate and the increasing of rate of mortality. One of the most important aims of this research is to answer the question why those differences exist in the natural increase in the population among urban and rural settlements, as well as which are the directions of even regional development. In this research different methods are used (statistics, cartographic, analytics and synthetics), and results of it might have applicable value in the future planning of demographic and economic development of Ra ka region.
Seasonal variability of Crvena river water mineralization
Manojlovi? Predrag,NikoliMilena,Mustafi? Sanja,Lukovi? Jelena
Glasnik Srpskog Geografskog Dru?tva , 2010, DOI: 10.2298/gsgd1004009m
Abstract: The mineralization of water and its content in Crvena River so far have not been studied. Water sampling was conducted from April 2008 - May 2009. Total mineralization is relatively low, which is consistent with the dominant lithological structure (Permian red sandstone). Dry residue contains Ca2+ ion, with the increased participation of SiO2. During the observational period it is clearly expressed seasonal effect. It is reflected not in the direct but the indirect impact. Based on the ratio of individual ions a model is determined for estimation of water flow at the confluence of the Crvena River in Nisava River. It could be applied to other drainage basins that have not been studied so far.
Thermal characteristics of air of the basin of Nis for the purpose of quicker economic development
Ivanovi? Radomir,Marti?-Bursa? Nata?a,Ivanovi? Marko,NikoliMilena
Glasnik Srpskog Geografskog Dru?tva , 2011, DOI: 10.2298/gsgd1102085i
Abstract: The characteristics of air temperature or heat mode the air is an important segment of the overall climate and the natural resource factor in the economic development of any place or region. In order to properly determine those, needs is a continuous series of data for at least 25-35 years. As longer as series are, the obtained data are more realistic. Weather Station-observatory "Tvrdjava" in Nis (φ-430 20 ', λ-21054', h-201 m), is the only higher-order station in the Ni valley, so, for determining the thermal properties of air, used measurement data from this station, for the period 1950-2009. Based on this 60-year period, analyzed the mean monthly, extreme temperature and annual temperature, the certain temperature thresholds and dates of onset for characteristic temperatures, and analyzed the frequency of occurrence some typical days.
Geographical basis of tourist development of the Sokobanja basin
Radivojevi? Aleksandar,Filipovi? Ivan,Dimitrijevi? Ljiljana,NikoliMilena
Glasnik Srpskog Geografskog Dru?tva , 2010, DOI: 10.2298/gsgd1003111r
Abstract: Sokobanja is one of the major tourist sites in Serbia. It has significant tourist potential. Nonetheless, tourism, as well as other economic activities in this region, is in deep crisis. This paper analyzes the advantages and disadvantages of tourism development in the spa area. According to a survey, there is a good basis to attract tourists, but further development requires higher investments, as well as greater involvement of local residents.
In vitro examination of oral tissue conditioners potential toxicity
Kruni? Neboj?a,Nikoli? Ljubi?a,Kosti? Milena,Najman Stevo
Hemijska Industrija , 2011, DOI: 10.2298/hemind110627056k
Abstract: The oral tissue conditioners are applied temporarily to the gingival surface of a denture for the purpose of reconditioning the abused denture supporting tissues, allowing them to return to a normal, healthy state. According to chemical composition they can be classified into methacrylic and silicon conditioners. The objective of this research was to examine the potential toxicity of one, seven and thirty day extracts of different concentrations. Different effective concentrations (5, 12.5, 25 and 50%) of two silicone and four methacrylic conditioners extracts were used after extraction period of one, seven and thirty days. Amount of toxic substances and dynamics of their release were monitored by high-pressure liquid chromatography (HPLC). HPLC analysis could not be applied to the silicone conditioners because they consist of polymeric and inorganic 19 substances. Evaluation of cell proliferation, as cytotoxic parameters, was done by Mosmann’s MTT assay based on reduction of yellow tetrazole (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide - MTT) to purple formazan by mitochondrial succinate dehydrogenase of metabolic active cells. With increasing of extraction period, the amount of released potential toxic substances increased. The cytotoxicity of tested materials significantly increased with extract concentration increase and duration of extraction period. To improve the biological characteristics of mobile dentures relined by soft materials, soaking in water the day before insertion into patient’s mouth was recommended. Silicone conditioners showed less cytotoxicity compared to the methacrylic conditioners, so they are more appropriate for daily dental practice.
Vanja Ni?kovi?,Jelenka Nikoli,Gordana Koci?,Milena Ili?
Acta Medica Medianae , 2011,
Abstract: Alcoholism is one of the leading diseases affecting people’s health and immunity worldwide. Nearly 30 thousand people in the USA die from chronic liver damage. The liver is the central organ in the metabolism of alcohol. Alcohol is primarily a hepatotoxic agent. Hepatotoxicity of alcohol is clinically manifested by the development of alcoholic fatty liver, alcoholic hepatitis and alcoholic cirrhosis. It is characterized by appropriate symptomatology, depending on the degree of liver damage. Excessive use of alcohol for a long period of time, along with malnutrition, genetic and ethnic predisposition, leads to alcoholic cirrhosis and the development of its complications. Portal hypertension damages other organs and organ systems, causing hepatopulmonary syndrome, hepatorenal syndrome, hepatic encephalopathy, spontaneous bacterial peritonitis, etc. For these reasons, alcoholism reduction is given priority, as well as reduction of morbidity and mortality of people with alcoholic chronic liver damage. Therefore, early diagnosis of alcohol abuse is necessary, as well as timely diagnosis of different degrees of alcoholic liver damage. The diagnosis of chronic alcoholic liver damage is set on the basis of confirmed data of alcohol consumption; liver function test (serum markers aminotransferase, gammaglutamyl transferase, prothrombin time, serum bilirubin and albumin level); serum markers of liver fibrosis. Fibrosis markers are directly involved in sedimentation and dissolution of extracellular matrix, i.e. in the process of fibrogenesis and fibrinolysis of liver tissues. They include markers and enzymes of metabolism, as well as cytokines and chemokines.
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