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Search Results: 1 - 10 of 1414 matches for " Stefanovi? Predrag Lj. "
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Evaluation of Kolubara lignite carbon emission characteristics
StefanoviPredrag Lj.,Markovi? Zoran J.,Baki? Vukman V.,Cvetinovi? Dejan B.
Thermal Science , 2012, DOI: 10.2298/tsci120215130s
Abstract: The revised Intergovernmental Panel on Climate Change (IPCC) guidelines for national greenhouse gas (GHG) inventories recommends that more comprehensive and thus more reliable characteristics of the local fossil fuels should be used for the national GHG inventory calculations. This paper deal with the carbon emission characteristics of low-calorific lignite recovered from the Kolubara open-pit mine. The samples of coal were carefully selected in order to cover the net calorific value, ash and water content of the broad spectrum of the quality of the raw lignite supplied to the Serbian thermal power plants. Correlation analysis of the laboratory analysis data gave a linear dependency of the net calorific value on the combustible content in the coal samples. Also, linear correlation between the carbon content and the net calorific value was found. The regression analysis of experimentally determined coal characteristics implies that the carbon emission factor is dependent on the net calorific value. For the subset of raw lignite samples with the net calorific value Qdr = 6 ÷ 10 MJ/kg, that is most representative for current and near future use for power generation in Serbian thermal power plants, the linear dependency CEFr (tC/TJ) = 34.407 - 0.5891×Qdr (MJ/kg) was proposed. Regarding the net calorific ranges of samples examined, the raw Kolubara lignite carbon emission factor is considerably higher than those recommended by IPCC Tier 1 method of 27.6 tC/TJ.
Hypertension in dogs and cats: Causes and effects
Stepanovi? Predrag,Stefanovi?-Nikolovski Zorica
Veterinarski Glasnik , 2005, DOI: 10.2298/vetgl0502149s
Abstract: During the nineties of the past century, several authors underscored the necessity of measuring blood pressure during a regular clinical examination of veterinary patients, because hypertension occurs as an accessory symptom in the course of diseased conditions. In addition to blood pressure measurements, most authors believe that it is necessary also to examine intraocular pressure, like in human medicine. Hypertension can be defined as a chronic increase of the systolic and diastolic blood pressure. Systemic blood pressure is proportionate to the heart rate and total peripheral resistance, while physiological control depends on the reninangiotensin system, aldosterone, prostaglandin, adrenergic and neurogenic factors. Some other factors can also have an influence on the measured values of blood pressure (such as age, sex, race, temperament, environment, and, in part, also how and where the pressure measurement was taken). It has been generally accepted in veterinary medicine than an animal can be considered hypertensive if the measured systolic/diastolic pressures are higher than 180/100 mm Hg. Hypertension can be primary (sometimes also defined as essential or idiopathic) when it is a consequence of several factors which include heart, neurological, kidney, endocrine, and metabolic aspects. Hypertension is defined as secondary when it occurs as a consequence of certain chronic disorders (such as hyperthyroidism, hypothyroidism, hyperadrenocorticism, pheochromocytoma, and diabetes mellitus). Blood pressure can be measured in animals using direct or indirect methods. The oscilometric and the ultrasonographic methods are equally used in the world today. Following detailed studies by large numbers of authors, the physiological frameworks of blood pressure in animals have been precisely determined. Different treatments are applied in the therapy of hypertension in animals, such as: restrictive diets, diuretics, a, and (3 blockers, blockers of calcium channels, vasodilators, ACE inhibitors. Hypertension can also be a state that requires emergency treatment, when it is resolved with aggressive therapy.
Epidemiological characteristics of salmoneilosis in Vojvodina
Petrovi? Vladimir,Stefanovi? Slavica,?uri? Predrag
Medicinski Pregled , 2005, DOI: 10.2298/mpns0504136p
Abstract: Introduction Salmonella infections are the most common food-born diseases transmitted from animals to humans. Epidemics of salmonellosis occur after eating improperly cooked contaminated foods. Material and methods A descriptive epidemiological method was used to analyze epidemiological characteristics of salmonellosis in Vojvodina in the period 1978-2003. Results During this period there were 26 851 cases of salmonellosis (mean annual incidence of 51.1/100 000 and mean annual mortality of 0.9/100 000). Mean annual case fatality ratio during this period was 0.1%. The specific incidence was highest in 12-24 month-old children (251/100 000), and lowest in the oldest age group (13.9/100 000). Lethality was highest in children younger than 1 year, and persons older than 50 years (84%). The number of cases registered in food-born epidemics makes 41.7% of all registered cases. A mayority of 772 registered epidemics were small epidemics among families, relatives and friends. The great epidemics with large number of infected persons were due to an industrial bakery with 1713 ill persons and a public restaurant with 311 ill persons during the 80 's. An epidemic was due to sandwiches from an industrial bakery distributed through the whole territory of Vojvodina with the highest incidence of salmonellosis in 1987 (137.7/100 000). The most common serotype was S. enteritidis (69.7%), but 68 more serotypes were isolated. The most common cause of epidemics were eggs and egg products (76.2%). Salmonella spp. was isolated from food in small number of epidemics (less than 20%), because epidemics were discovered usually 2 or 3 days after their beginning. .
Epidemiological characteristics of pertussis in Vojvodina
Petrovi? Vladimir,?uri? Predrag,Stefanovi? Slavica
Medicinski Pregled , 2006, DOI: 10.2298/mpns0602019p
Abstract: Introduction. In the preimmunization era, pertussis was one of the most common respiratory diseases in children in Vojvodina. Material and methods. This paper deals with effects of immunization against pertussis in Vojvodina and its epidemiological characteristics during the last 10 years. Results and discussion. The average incidence rate for the preimmunization era (1948-1960) was 122/100.000. During the period of immunization, the incidence rate has been continuously declining. During the period from 1995 till 2004, average incidence rate was 0,2/100.000 There were 125 registered deaths caused by pertussis in the preimmunization era, and 13 deaths in the immunization period. The last case of death caused by pertussis occurred in 1970. Pertussis vaccination coverage in Vojvodina has been above 95% for a long period of time. Pertussis is still reported, mostly in individual cases. Since 2003, it was registered in children younger than 24 months. During the last decade, 82% of cases were unimmunized children. The majority of affected were infants (59%) and children from 12 to 24 months of age (15%). Pertussis is registered in small children due to delayed immunization and in school children due to loss of immunity. Conclusion. Favorable epidemiological situation of pertussis in Vojvodina is the result of high immunization coverage. The disease is most frequently registered in individual cases, in unimmunized infants and small children. Mild cases of pertussis remain unrecognized in older age groups, in previously immunized children. It is necessary to improve surveillance and laboratory diagnostics of pertussis in order to monitor the epidemiological situation and to provide timely investigation and control of pertussis. .
X-ray and CT presentation of advanced gastric carcinomas of different locations
?uri?-Stefanovi? A.,?aranovi? ?.,Ma?ulovi? D.,Lazi? Lj.
Acta Chirurgica Iugoslavica , 2009, DOI: 10.2298/aci0904099d
Abstract: We presented the X-ray and CT findings characteristic for gastric cancers of different localizations (localized in different parts of the stomach). Particularly, esophagogastric junction (EGJ) carcinomas and antral carcinomas are singled out, as two localizations of gastric cancer that we usually meet in everyday clinical and radiological practice, and which have completely different radiological presentation. Advanced carcinomas of esophago-gastric junction, whose incidence is on the rise, usually affect the distal segment of the esophagus, cardia, and proximal part of the stomach, in different proportions. Siewert's, and the Japanese classification of these tumors are listed. Due to the involvement of the distal esophagus, scanning region, besides the abdomen, should be expanded to the chest. Advanced cancer of the antral part of the stomach is presented by the X-ray as a fungating, infiltrative, or combined form, often capturing the entire wall circumference. Possible infiltration of the left liver, the body and neck of the pancreas, colon and anterior abdominal wall should be estimated by CT.
Disease of lower cranial nerves caused by vascular compression
Anti? B.D.,Peri? P.,Stefanovi? S.Lj.
Acta Chirurgica Iugoslavica , 2008, DOI: 10.2298/aci0802027a
Abstract: Between April 1989 and September 2007, 181 patients with disease of lower cranial nerves (DLCN) underwent posterior fossa exploration. As a cause of DLCN, vascular compression (VC) was present in 89 patients with trigeminal neuralgia (TN), in 6 with hemifacial spasm (HFS), in 1 with glossopharyngeal neuralgia, in 1 with Meniere’s disease, and in 5 with multiple DLCN. Depending on intraoperative findings, different surgical options were used: microvascular decompression (MVD), MVD with partial sensory rhizotomy (PSR) or total sensory rhizotomy (TSR). Statistic analysis was made using the Fisher’s exact 2-side test. In patients with TN, excellent outcome was archived in 83 patients and good in 6. Postoperative outcome was better (p = 0.007) in cases with severe VC, but without significant correlation between used surgical option and outcome (p = 0.402). Frequency rate of relapses did not depend on severity of VC (p = 0.502) and used surgical option (p = 0.175). In 6 patients with HFS, excellent outcome was archived in 5 with arterial compression and poor in 1 with venous contact. In patients with Meniere’s disease and glossopharyngeal neuralgia, MVD result with excellent outcome. In 5 patients with multiple DLCN, excellent outcome was archived in 3 and good in 2. MVD is method of choice in surgical treatment of DLCN caused by VC. Overall outcome is better with severity of VC.
The thickness of the retrobulbar portion of the optic nerve in Graves ophthalmopathy measured by ultrasound
Stefanovi? Ivan,Paovi? Jelena,Kova?evi? Igor,Paovi? Predrag
Srpski Arhiv za Celokupno Lekarstvo , 2009, DOI: 10.2298/sarh0906230s
Abstract: Introduction. The clinical diagnostic of Graves ophthalmopathy is based on the association of ocular signs and the disease of the thyroid gland. The evolution of the disease involves the development of eye globe protrusion, extraocular muscle thickening pressuring the optic nerve, which can result in its thickness. Objective. The aim of the paper is to find whether the retrobulbar optic nerve thickened and if there was a correlation between its possible thickening and the thickness of the muscles in Graves ophthalmopathy. We also wished to test the theory of compressive aetiology of such thickening using a 30-degree test. Methods. We examined 28 patients with Graves ophthalmopathy. The thickness of the retrobulbar optic nerve was measured by ultrasound on a B-scan using the Schraeder's method and by the largest thickness of the internal muscle. Results. The thickness of the retrobulbar portion of the optic nerve in the 52 analyzed eyes with signs of the disease ranged between 3.24 mm to 6.30 mm, with median of 5.13 mm, indicating that the majority of the patients had optic nerve thickening rating at this value. Forty-eight eyes had a marked retrobulbar optic nerve thickening, with the thickening over 4 mm, while in 4 eyes with signs of Graves ophthalmopathy the thickness of the optic nerve was within normal limits. We detected that 92.3% of the patients with muscular thickening also had a directly proportional thickening of the retrobulbar optic nerve. By using the 30-degree test we confirmed the diagnosis of compressive neuropathy. Conclusion. Patients with Graves ophthalmopathy and thickened muscles, also have a thickening of the retrobulbar optic nerve; the rate of the thickness directly depends on the degree of the muscular thickness. The word is of compressive neuropathy, i.e. the thickness of the optic nerve is the result of subarachnoid fluid stasis caused by the compression on the optic nerve.
COLOR DOPPLER AND COLOR DOPPLER ENERGY IMAGING AND MEASUREMENTS OF INTRAOVARIAN VASCULARISATION DURING LUTEAL PHASE OF MENSTRUAL CYCLE
Ranko Kutle?i?,Jasmina Popovi?,Predrag Vukomanovi?,Milan Stefanovi
Acta Facultatis Medicae Naissensis , 2009,
Abstract: The aim of this investigation was to determine if there were differences: (1) in color Doppler (CD) ultrasound imaging and measurements of periluteal vascularisation in ovary bearing corpus luteum and stromal blood flow of contralateral ovary in ovulatory cycle, and (2) between intraovarian midluteal vascularisation in the group of ovulatory patients and ovarian stromal blood flow of the 21st cycle day in the patients with anovulatory cycles. This prospective clinical investigation involved 205 patients divided into two groups: with ovulatory and anovulatory cycles. CD ultrasound examination of intraovarian vascularisation were performed during menstrual cycle, and CD indices were analyzed: pulsatile index PI, resistance index RI, and systolic/diastolic - S/D ratio. PI was statistically significantly lower in the group of ovulatory patients: 0.8 ± 0.14 vs 1.265 ± 0.41. The same was true for RI ( 0.51 ± 0.04 vs 0.65 ± 0.07) and for S/D ratio (2.08 ± 0.23 vs 2.91 ± 0.58. Resistance to blood flow in periluteal vessels during the midluteal phase was lower than in stromal vessels of nondominant ovary in ovulatory patients (PI 0.8 ± 0.14 vs 2.08 ± 0.31; RI 0.51 ± 0.04 vs 0.74 ± 0.1 and S/D ratio 2.08 ± 0.23 vs 4.25 ± 1.76). Our investigation showed that the resistance to intraovarian blood flow was lower in ovulatory compared to anovulatory cycles. The same was true for intraovarian – periluteal vascularisation in the ovary with corpus luteum compared to stromal vascularisation of nondominant ovary.
ULTRASOUND-DETERMINED DIMENSIONS OF THE RENAL PARENCHYMA ULTRASOUND IN HEALTHY CHILDREN
Rade ?ukuranovi?,Predrag Miljkovic,Natalija Stefanovi,Miomir Stojanovic
Acta Medica Medianae , 2001,
Abstract: In 195 with no manifest urinary tract disease, of me one to seven years of age,the ultrasound was used to determine the renal parenchvma (thickness at the genderinter-gender levels); their correlation with age the kidney dimensions was examined.The dynamic ratio between the parenchyma dimensions and those of the kidney wasanalyzed. The real-time mechanical sector scanner (ALOKA SSD 500) was used with convex probes of 3,5 and 5 MHz in the supine position and in the counter-lateralbody decubitus. The parenchyma dimensions kept on increasing continuously duringthe analyzed period, most intensely in the second and fifth years of age. Theparenchyma enlargement was in a better con-elation with the kidney growth than withthe childrens age. Still, there is an evident slight enlargement of the parenchymadimensions than that of the kidney dimensions.
VAGINAL DELIVERY OF GIANT FETUS – SHOULDER DYSTOCIA
Predrag Vukomanovi?,Milan Stefanovi,Mileva Milosavljevi?,Ranko Kutle?i?
Acta Medica Medianae , 2009,
Abstract: Shoulder dystocia (SD) is defined as unpredictable and urgent obstetric complication that happens when the pelvis of a mother is spread sufficiently to deliver fetal head, but insufficiently to deliver fetal shoulders. It is associated with high percentage of maternal and fetal morbidity. Fetal lethality from hypoxia ranges from 2-16%.We observed the case of vaginal delivery in a multiparous woman in the 39th gestational week. Head delivery was performed by using vacuum extraction. Because of the shoulder dystocia, we applied McRoberts’ maneuver with Resnik’s suprapubic pressure and performed one more episiotomy. Since these maneuvers did not give the expected result, we did the aspiration of the upper respiratory paths of the fetus, after which we performed Hibbard’s cord with simultaneous Kristeler’s maneuver. It led to releasing the shoulders and fetal delivery. On delivery, male fetus was 6000 g/60 cm, estimated with Apgar 1. The urgent reanimation was undertaken. After few hours, the baby was transferred to Pediatric Surgical Clinic for further treatment of present pneumotorax and humerus fracture. After many days, the baby being in normal state, was referred to physical rehabilitation treatment. Today, the baby is without sequelae.SD is one of the most difficult, hardly predictable perilous obstetric complications with high percentage of maternal morbidity and fetal morbidity and mortality. It requires caution, training and skills of obstetric-neonatal team. Liberalization of the use of Caesarian section in managing SD decreases the appearance of injuries in both mother and child. However, regardless of very rapid development of perinatology and the use of modern diagnostic-therapeutic protocols, some questions from classical, practical obstetrics remain unanswered.
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