Globalno umrežavanje i digitalna diplomatija

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Internet kao sredstvo za političke komunikacije

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Risk factors for the occurrence of cardovascular system diseases in students

Background/Aim. Cardiovascular diseases are a leading cause of death in the majority of developed, as well as in many developing countries. The aim of this study was to determine cardiovascular risk factors in student population and to suggest possible measures for prevention. Methods. The study was carried out during 2007-2008 at the School of Medicine, University of Niš. It included 824 students in their final year (220 males, 604 females). Results. There was no significant difference in prevalence of hypertension among the male (1.81%) and female students (0%). The prevalence of obesity (Body Mass Index - BMI > 30 kg/m2) was significantly higher (p < 0.001) in the male (7.27%) than in the female population (1.32%). Abdominal obesity was also more frequently encountered (p < 0.01) in the male (9.09%) than in female population (1.32%). Every fourth student smoked cigarettes with no significant difference between the male and female students. Alcohol consumption was a significantly higher problem (p < 0.001) in the male population (18.18%) than in the female one (2.65%). Physical inactivity was more often found (p < 0.001) in the female students (65.56%), than in male ones (36.36%). By the bivariate correlation of cardiovascular risk factors, it was determined that in the male student population systolic blood pressure correlated significantly with diastolic blood pressure, BMI and waist size, whereas age correlated with sistolic blood pressure, waist size and smoking. In the female students sistolic blood pressure correlated with diastolic blood pressure, BMI and waist size; diastolic blood pressure correlated with BMI and physical inactivity; cigarette smoking correlated with alcohol consumption and age. Conclusion. Cardiovascular risk factors are present in the final-year students of the School of Medicine, University of Niš. It is necessary to insist on decreasing obesity prevalence, cigarette and alcohol consumption, and on increasing physical activity of students in order to prevent cardiovascular diseases

Dome Beyond Its Limits or How Deep Is Your Love

This text is a part of tripartite study on the dome – architectural term associated with spherical geometry and sublimity as ontological feature of the form that corresponds methodological instance of absolute space. Morphological capacity of the dome is ex- posed in its etymology, which transposes the architecture of the sky, taking this shape as part of the whole and the whole within. The first of three parts, The Architecture of Dome: Mapping the W/Hole, explores the architectural capacity for geometric materi- alization of the sky in the age of virtual decomposition of shape into function of endless exposure to the unknown. The second text, Architectural Sublime: Dome Above Dome includes symbolic processing of the sublime architectural place, which equally to geo- metric distribution of the dome and linear character of its path determines the univer- sal character of things. The central position of the third part, Dome Beyond Its Limits or How Deep Is Your Love, is given to the sensibility of the shapes questioned from the perspective of archetype, and its radiance becomes the expression of inability to round things up. Instead of beauty and the universal law of proportion, the first becomes the place of eccentricity and tension of personal spatial feeling. Therefore, today, instead of concave feeling for the space above, where historically speaking the dome is its geometric paragon, the position outside of the borders of the projection of the dome is marked by distancing in space and time expressed in increasing numbers.https://iaaesthetics.org/wp-content/Pdfs/20_IAA_YEARBOOK_THE_AESTHETICS_OF_ARCHITECTURE_Y_BEYOND_FORM.pd

Antiarrhythmic Drugs in Atrial Fibrillation

Atrial fibrillation (AF) represents the most common sustained heart rhythm abnormality. It presents in paroxysmal and persistent forms. The pathogenesis of AF is still debatable with several proposed mechanisms. The main pathway for diagnosis of AF is through electrocardiographic record. Treatment strategies can be divided into two strategies: rate and rhythm control. For rhythm control, antiarrhythmic drugs, direct current cardioversion, and electrophysiological ablation are used, while for rate control, chronotropic drugs are being used, while AV node ablation is required in order to reduce rapid ventricular rate, which is often observed in patients with AF. The rhythm control strategy implies the use of cardioversion to convert AF to normal, sinus rhythm. Cardioversion can be either pharmacological or electrical. Rate control strategy can be implied to patients with permanent AF but should also imply for the patients with paroxysmal AF when relapse occurs. Rapid ventricular rates can cause palpitations or even a syncope and other rate-related symptoms; however, these high ventricular rates lead to degradation of left ventricle performance, mitral regurgitation, and further dilatation of the left atrium. The main antiarrhythmic drugs used in treatment of AF are propafenone, flecainide, beta-blockers, amiodarone, dronedarone, dofetilide, vernakalant, and ranolazine

Structural features of near equiatomic FeCo-2V semi-hard magnetic alloy prepared by MIM technology

The structural properties of a magnetically semi-hard near equiatomic FeCo-2wt%V (FeCoV) alloy produced by Powder Injection Moulding (PIM) (option by fine metal powder - Metal Injection Moulding (MIM) technology) were investigated in this paper. Starting granulate was prepared by mixing FeCoV powder with a low-viscosity binder. After injection, the green samples were first treated with a solvent and then thermally with the same aim of removing the binder. MIM technology was completed by high-temperature sintering for 3.5 hours at temperatures from 1370 OC to 1460 OC in a hydrogen atmosphere, which provides the necessary magnetic and mechanical characteristics. The influence of sintering temperature was investigated concerning the aspects of the processes of structural transformation by the methods of X-ray diffraction (XRD) and scanning electron microscopy (SEM). The appearance of an intense diffraction peak of the α'-FeCo phase (crystal structure type B2) was registered for all investigated samples. Structural parameters particle size Dmax, Feret X, and Feret Y exhibit constant increase with increase of sintering temperature

EDGE DETECTION PARAMETER OPTIMIZATION BASED ON THE GENETIC ALGORITHM FOR RAIL TRACK DETECTION

One of the most important parameters in an edge detection process is setting up the proper threshold value. However, that parameter can be different for almost each image, especially for infrared (IR) images. Traditional edge detectors cannot set it adaptively, so they are not very robust. This paper presents optimization of the edge detection parameter, i.e. threshold values for the Canny edge detector, based on the genetic algorithm for rail track detection with respect to minimal value of detection error. First, determination of the optimal high threshold value is performed, and the low threshold value is calculated based on the well-known method. However, detection results were not satisfactory so that, further on, the determination of optimal low and high threshold values is done. Efficiency of the developed method is tested on set of IR images, captured under night-time conditions. The results showed that quality detection is better and the detection error is smaller in the case of determination of both threshold values of the Canny edge detector

Characterization of FeCoV Alloy Processed by PIM/MIM Route

In this study the characterization of FeCo-2V alloys toroidal samples produced by PIM/MIM technology was presented. The feedstock for metal injection molding (MIM) was prepared by mixing starting FeCoV powder with a low viscosity binder. Green samples were subjected to solvent debinding and subsequent thermal debinding followed by sintering. Sintering was performed during 3.5 hours from 1370 degrees C to 1460 degrees C in hydrogen atmosphere in order to attain the appropriate mechanical and magnetic properties. Microstructure, hardness HV10 and magnetic hysteresis B(H) were investigated as a function of sintering temperature. Optimum combination of functional properties was observed after sintering at temperature of 1370 degrees C. In addition, magnetic properties were analyzed as frequency dependent and successfully simulated in operating frequency range from 5 Hz to 60 Hz

Characterization of FeCoV Alloy Processed by PIM/MIM Route

In this study the characterization of FeCo-2V alloys toroidal samples produced by PIM/MIM technology was presented. The feedstock for metal injection molding (MIM) was prepared by mixing starting FeCoV powder with a low viscosity binder. Green samples were subjected to solvent debinding and subsequent thermal debinding followed by sintering. Sintering was performed during 3.5 hours from 1370 degrees C to 1460 degrees C in hydrogen atmosphere in order to attain the appropriate mechanical and magnetic properties. Microstructure, hardness HV10 and magnetic hysteresis B(H) were investigated as a function of sintering temperature. Optimum combination of functional properties was observed after sintering at temperature of 1370 degrees C. In addition, magnetic properties were analyzed as frequency dependent and successfully simulated in operating frequency range from 5 Hz to 60 Hz

EXPERIMENTAL STUDY OF TEXTILE DEFORMATION USING 3D DIGITAL IMAGE CORRELATION METHOD

Textiles are unique due to their structure and formability properties. In order to predict the behaviour and properties of textile materials, standard investigation methods are not always sufficient. In this paper, a more detailed study is performed and additional results were obtained when the 3D Digital Image Correlation (DIC) method was adjusted to the standard test method. The digital image analysis method is one of the newly proposed methods used to determine textile deformation behaviour. It is possible to capture the formation of localized deformation zone, besides capturing the deformation of the woven fabric. The procedure of digital video camera recording is simple, but preparation and processing on a computer are relatively demanding concerning processing time and data preparation for analysis. The processing time for displacement calculation depends on the image resolution, number of images, chosen area sizes on images for analysis, number of facet centers and characteristics of the computer used for results processing. Obtained results are adequate and satisfy the requirements of accuracy applied to material science. Therefore, the application of the image analysis method for the investigation of deformed textile materials is possible