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Search Results: 1 - 10 of 895 matches for " Despotovi? Dejan "
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Simulated exposure of titanium dioxide memristors to ion beams
Marjanovi? Nada S.,Vujisi? Milo? Lj.,Stankovi? Koviljka ?.,DespotoviDejan
Nuclear Technology and Radiation Protection , 2010, DOI: 10.2298/ntrp1002120m
Abstract: The effects of exposing titanium dioxide memristors to ion beams are investigated through Monte Carlo simulation of particle transport. A model assuming ohmic electronic conduction and linear ionic drift in the memristor is utilized. The memristor is composed of a double-layer titanium dioxide thin film between two platinum electrodes. Obtained results suggest that a significant generation of oxygen ion/oxygen vacancy pairs in the oxide is to be expected along ion tracks. These can influence the device’s operation by lowering the resistance of the stoichiometric oxide region and the mobility of the vacancies. Changes induced by ion irradiation affect the current-voltage characteristic and state retention ability of the memristor. If the displaced oxygen ions reach the platinum electrodes, they can form the O2 gas and cause a permanent disruption of memristor functionality.
Blood pressure circadian rhythm and obesity: Blood pressure variations and obesity
Despotovi? Neboj?a
Medicinski Pregled , 2002, DOI: 10.2298/mpns0210419d
Abstract: Introduction The association between obesity and arterial hypertension has been established in a great number of studies. Our objective was to investigate whether circadian rhythm of blood pressure is disturbed among obese people. Material and methods In this cross-sectional, randomized study, Schiller BR-102 device was used for ambulatory blood pressure monitoring. One hundred and twenty outpatients were divided into three randomized groups: obese body mass index 30 kg/m2 (52 patients), overweight (28 patients), with body mass index 25,0-29,9 kg/m2 and normal weight (control group) (48 patients), with body mass index 18,5-24,9 kg/m2. In all patients we investigated the following blood pressure parameters: average blood pressure (total, day-time and night-time), maximal blood pressure and dipping or non-dipping blood pressure pattern during night (for systolic and diastolic blood pressure, respectively). Results In body mass index beyond 30 kg/m2 only systolic blood pressure parameters were significantly higher - average blood pressure - during daytime (P=0.034) and during night (P=0.014); maximal blood pressure (P=0.001). In body mass index beyond 30 kg/m2, absence of normal blood pressure during night was significantly more often registered (P=0.007). Discussion and Conclusion The non-dipping blood pressure pattern and increase of systolic blood pressure only reveal hyper activation of sympathetic nervous system as a leading pathophysiological mechanism causing arterial hypertension in obese patients.
Tauberian theorem for the distributional Stieltjes transformation
D. Nikoli?-Despotovi,S. Pilipovi?
International Journal of Mathematics and Mathematical Sciences , 1986, DOI: 10.1155/s0161171286000649
Abstract: In this paper we use the notion of L-quasiasymptotic at infinity of distributions to obtain a final value Tauberian theorem for the distributional Stieltjes transformation.
Multiple arterial disease in clinical practice
Despotovi? Neboj?a,Zdravkovi? Mihajlo
Srpski Arhiv za Celokupno Lekarstvo , 2002, DOI: 10.2298/sarh0210316d
Abstract: There is a significant correlation among obliterate lesions of coronary carotid and peripheral arteries of the lower arteries at the same time. This pointed out that whenever clinical manifestations of obliterate disease of peripheral arteries are present. There is also need for routine examination of existent coronary artery disease. In the case of concomitant significant coronary and carotid vascular disease there is a question what should be operated first. The most vascular centres prefer carotid endarterectomy before aortocoronary bypass, and if there is nonstable coronary disease simultaneous carotid endarterectomy and aortocoronary bypass should be carried out.
Comparative analysis of business sophistication of Serbia and its neighboring countries
Cvetanovi? Slobodan,Despotovi? Danijela,Nedi? Vladimir
Industrija , 2012,
Abstract: Innovation of an economy refers to the ability of a national economy to create and use knowledge in the production of new products, services and processes. In the economy of knowledge, innovation represents a key determinant of the competition of a country at the world market. Metrics Global Innovation Index is valuable for countries such as Serbia because it is a good indicator of its speed and direction of movement in relation to the proclaimed goals of economic development policy. This paper analyzes the business sophistication, as one of the five determinants of innovativeness of countries measured by the methodology of the Global Innovation Index, Serbia and neighboring countries.
Predictive ECG coding using linear time-invariant models
Bo?kovi? Aleksandar,Despotovi? Miroslav,Baji? Dragana
Archive of Oncology , 2004, DOI: 10.2298/aoo0403152b
Abstract: Electrocardiogram (ECG) signal compression suffers of lack of standards for analogue-digital conversion. Results of this study have shown that 8 bits/sample, although frequently in use, does not satisfy quality criteria for medical doctors. This paper also presents predictive technique for lossless ECG compression using linear time-invariant models. Tests on clinically measured ECG signals confirm a very good performance in terms of compression ratio.
Power electronics solution to dust emissions from thermal power plants
Vukosavi? Slobodan,Popov Nikola,Despotovi? ?eljko
Serbian Journal of Electrical Engineering , 2010, DOI: 10.2298/sjee1002231v
Abstract: Thermal power stations emit significant amounts of fly ash and ultra fine particles into the atmosphere. Electrostatic precipitators (ESP) or electro filters remove flying ashes and fine particles from the flue gas before passing the gas into the chimney. Maximum allowable value of dust is 50 mg/m3 and it requires that the efficiency of the ESPs better than 99 %, which calls for an increase of active surface of the electrodes, hence increasing the filter volume and the weight of steel used for the filter. In previous decades, electrostatic precipitators in thermal power plants were fed by thyristor controlled, single phase fed devices having a high degree of reliability, but with a relatively low collection efficiency, hence requiring large effective surface of the collection plates and a large weight of steel construction in order to achieve the prescribed emission limits. Collection efficiency and energy efficiency of the electrostatic precipitator can be increased by applying high frequency high voltage power supply (HF HV). Electrical engineering faculty of the University of Belgrade (ETF) has developed technology and HF HV equipment for the ESP power supply. This solution was subjected to extensive experimental investigation at TE Morava from 2008 to 2010. High frequency power supply is proven to reduce emission two times in controlled conditions while increasing energy efficiency of the precipitator, compared to the conventional thyristor controlled 50Hz supply. Two high frequency high voltage unit AR70/1000 with parameters 70 kV and 1000 mA are installed at TE Morava and thoroughly testes. It was found that the HF HV power supply of the ESP at TE Morava increases collection efficiency so that emission of fine particles and flying ashes are halved, brought down to only 50 % of the emissions encountered with conventional 50 Hz thyristor driven power supplies. On the basis of this study, conclusion is drawn that the equipment comprising HF HV supplies are the best solution for new ESP installations, as well as for the reconstruction of existing facilities. The paper describes the topology of the HF HV power supply, power management and controls, and brings the most important details of the implementation. It is found that the HF HV solution achieves several significant improvements over the conventional thyristor system. It is possible to provide more precise control of the ESP parameters such as the output voltages and currents. It is also possible to make a rapid increase or decrease in voltage and to effectuate a very fast response to load changes
Application of enoxaparin simultaneously with fibrinolysis in patients with acute myocardial infarction with ST-elevation
Despotovi? Neboj?a,Lon?ar Goran,Nikoli?-Despotovi? Maja,Ili? Marjan
Medicinski Pregled , 2009, DOI: 10.2298/mpns0902013d
Abstract: Introduction Applied simultaneously with fibrinolytic therapy, low-molecular heparin enoxaparin is showing the potential of improving efficacy with rare adverse effects. Our objective was to investigate if enoxaparin with streptokinase (SK) in patients with acute myocardial infarction (AMI) had better effect than unfractioned heparin (UFH). Material and methods The patients with AMI with ST elevation where SK was applied, were divided into two groups: 1. in the study group (N=32, SK+E) both SK and enoxaparin were administered (E, 30 mg intravenously before SK, then after SK 80 mg subcutaneously every 12 hours for 3 days); 2. the patients of the control group were given continuous infusion of UFH 4 hours after SK (1000 i.j. per hour, 3 days). Two groups were similar regarding average age, previous coronary events and diabetes mellitus. Results The reperfusion, depending mostly on fibrinolytic therapy, was successful in both groups (71.9% vs. 65.8%). The recurrent ischemia was less frequent in the group where enoxaparin was used (18.8% vs. 40.6%, p=0.055), as well as heart failure (15.6% vs. 53.2%, p=0,095). There was no difference in adverse effects. Conclusions Enoxaparin used simultaneously with streptokinase in patients with AMI with ST elevation was safe and effective. The recurrent ischemia, the parameter of 'infarcted' coronary artery reoclusion, is less frequent in patients who had enoxaparin than unfractioned heparin with fibrinolytic therapy.
The safety of enoxaparine use in elderly with acute myocardial infarction
Despotovi? Neboj?a,Lon?ar Goran,Nikoli?-Despotovi? Maja,Ili? Marjan
Vojnosanitetski Pregled , 2007, DOI: 10.2298/vsp0710655d
Abstract: Background/Aim. Enoxaparin (ENOX), the lowmolecular- weight heparin, used in acute myocardial infarction (AMI) could lead to hemorrhage. The aim of this study was to determine whether bleeding was more often in AMI patients older than 65 or 75 years who receive ENOX or unfractionated heparin (UFH). Methods. Among the patients with AMI hospitalized during three successive months receiving ENOX or UFH, three group of parameters were investigated: demographic, ischemic and bleeding TIMI criteria. Results. Among 85 hospitalized patients with signs of AIM, there were 35 (41.2%) old 65 years or less, 32 (38.5) old 66-75 years and 18 (21.2%) older than 75 years. In AMI elderly patients, according to the received ENOX/UFH: ischemic complication (18.2 vs. 21.4%) were insignificantly lower and the number of lethal outcomes (18,2 vs. 17,8%) were insignificantly more often in ENOX group; represented only by one patient (age beyond 75 years), major and non-major bleeding events occurred only in UFH group. Conclusion. The ENOX usage in AMI in patients older than 65 years did not show any significant difference in efficacy and bleeding rate comparing to UFH.
Serbian KINDL questionnaire for quality of life assessments in healthy children and adolescents: reproducibility and construct validity
Dejan Stevanovic
Health and Quality of Life Outcomes , 2009, DOI: 10.1186/1477-7525-7-79
Abstract: Five hundred and sixty-four healthy children and adolescents completed the KINDL. Reproducibility was analyzed using the intraclass correlation coefficient (ICC). Confirmatory factor analysis (CFA) was performed to assess the structure of the KINDL - construct validity.The intraclass correlation coefficients ranged from 0.03 to 0.84 for the subscales and total score. A second order CFA model as originally hypothesized was tested: items (24), primary factors (six subscales), and one secondary factor (QOL). The fit indexes derived from a CFA failed to yield appropriate fit between the data and the hypothesized model.Majority of the subscales and total KINDL possess appropriate reproducibility for group comparisons. However, a CFA failed to confirm the structure of the original measurement model, indicating that the Serbian version should be revised before wider use for QOL assessments in healthy children and adolescent.Nowadays, when quality of life (QOL) has become a universally accepted concept for measuring the impact of different aspects of life on general well-being and everyday functioning, important perspectives are placed on the cross-cultural settings. The cross-cultural settings of QOL represent integral parts in the labelling, promotion and drug regulatory process, public health reporting, epidemiological researches, and multinational clinical trails [1-3]. However, appropriate QOL measures should be available across different cultures that could be used for such purposes. This implies that QOL measures need to be simultaneously developed across different cultures, respecting cultural diversities of each, or to be translated and validated form ones into other languages ensuring measurement equivalence between the original and new versions, but respecting the cultural distinctions of the new ones.The KINDL, a generic questionnaire for measuring QOL in children and adolescents, is frequently used in Germany and abroad to evaluate the impacts of health conditi
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