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Search Results: 1 - 10 of 401956 matches for " Jovanovi? Jovan M. "
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Estimation of evaporative losses during storage of crude oil and petroleum products
Mihajlovi? Marina A.,Velja?evi? Ana S.,JovanoviJovan M.,Jovanovi? Mi?a B.
Hemijska Industrija , 2013, DOI: 10.2298/hemind120301050s
Abstract: Storage of crude oil and petroleum products inevitably leads to evaporative losses. Those losses are important for the industrial plants mass balances, as well as for the environmental protection. In this paper, estimation of evaporative losses was performed using software program TANKS 409d which was developed by the Agency for Environmental Protection of the United States - US EPA. Emissions were estimated for the following types of storage tanks: fixed conical roof tank, fixed dome roof tank, external floating roof tank, internal floating roof tank and domed external floating roof tank. Obtained results show quantities of evaporated losses per tone of stored liquid. Crude oil fixed roof storage tank losses are cca 0.5 kg per tone of crude oil. For floating roof, crude oil losses are 0.001 kg/t. Fuel oil (diesel fuel and heating oil) have the smallest evaporation losses, which are in order of magnitude 10-3 kg/tone. Liquids with higher Reid Vapour Pressure have very high evaporative losses for tanks with fixed roof, up to 2.07 kg/tone. In case of external floating roof tank, losses are 0.32 kg/tone. The smallest losses are for internal floating roof tank and domed external floating roof tank: 0.072 and 0.044, respectively. Finally, it can be concluded that the liquid with low volatility of low BTEX amount can be stored in tanks with fixed roof. In this case, the prevailing economic aspect, because the total amount of evaporative loss does not significantly affect the environment. On the other hand, storage of volatile derivatives with high levels of BTEX is not justified from the economic point of view or from the standpoint of the environment protection.
Quality assurance of the Serbian national E-PRTR register reported data for large combustion plants
Savi? Marina A.,Red?i? Neboj?a D.,JovanoviJovan M.,Jovanovi? Mi?a B.
Hemijska Industrija , 2012, DOI: 10.2298/hemind110310065s
Abstract: The Serbian E-PRTR register (The European Pollutant Release and Transfer Register) was established in 2007 and harmonized with PRTR protocol of Arhus convention and E-PRTR directive. In this paper, the quality of 2009 data reported to the Serbian PRTR register was analyzed. The analysis includes 37 large combustion plants with the capacity equal or greater than 50 MW. The combustion plants include power plants, heating plants and industrial energy units. The calculation is done using EMEP/EEA 2009 methodology and Tier 2 approach. The analysis obtained presents an overview of the quality of the reported data for SOx, NOx and TSP emissions for 61 combustion units e.g. emitters (stacks). The results show that all 61 emitters reported data with the deviation greater than 25%, with 55% of the emitters reporting data that differed from pollutant to pollutant in comparison to the estimated data. Out of those, 30% of the emitters reported smaller and 8% reported greater emissions than estimated emissions with 7% of the emitters not submitting any emissions data. The analysis also includes calculation of the emissions scope limit within 95% confidence interval. According to these results, it can be concluded that only 15% of the emitters have emission levels that fall within the scope limits, 47% of the emitters reported data of which two data fall within the scope limits, 28% of the emitters reported data of which only one data fall within the scope limits, 3% of the emitters had data that didn’t fall within the scope limits, and 7% did not reported any emission data. The results of the analysis can be summarized as: 1) operators in facilities do not know how to calculate emissions from their sources, and 2) the application of global emission factors can lead to considerable errors. The main reasons for significant deviation are different fuel quality, type of technical units and human error, thus national emission factors should be developed.
Investigation of the influence of cementation of chromium onto aluminium on the characteristics of non-printing elements of an offset printing plate
?ivkovi? Predrag M.,Ili? Nenad M.,Popi? Jovan P.,Jovanovi? Slobodan M.
Hemijska Industrija , 2004, DOI: 10.2298/hemind0405232z
Abstract: The possibility of the electro less deposition of chromium onto aluminum was investigated in order to improve non-printing element properties. It was determined that the electrochemical deposition of trivalent chromium was possible from alkaline solutions. The presence of chromium was confirmed by the EDAX procedure in three different laboratories. The influence of chromium on the wet ability of the nonprinting elements of the printing form was examined by drop spreading. Specimens were examined by pouring distilled water in drops onto the surface of the specimen. The picture of the drop was taken by a digital camera from two directions, in order to measure the diameter of the spreaded drop (a measuring gauge was recorded together with the drop) and contact angle. The chromium-treated samples showed increased wettability compared with the non-chromium-treated samples. Improvement of the non-printing elements was confirmed during a printing test that was performed under real printing conditions. The purity of the prints made by two types of printing forms was analyzed in two ways: based on densitometric measurements and based on statistical analysis of the scanned print. Both methods of analysis of the control prints showed that the control prints made from chromium-treated specimens were purer than the prints made from the non-chromium-treated specimens. Considering that all the conditions of making the printing forms and the printing conditions, except the electro less deposition procedure were the same, it could be concluded that the electro less deposited layer of chromium improved the printing properties of the offset printing form because of the increased wettability.
Critical review of relations for predicting the normal freezing point of organic compounds
JovanoviJovan D.,Grozdani? Du?an K.
Hemijska Industrija , 2005, DOI: 10.2298/hemind0504060j
Abstract: This paper presents empirical relations for predicting the normal freezing point of organic compounds. Nine relations were tested with 90 organic compounds. The Meyer-van der Wyk and Kreglewski-Marano-Holder models are recommended for normal alkanes, and the Constantinou-Gani and Wen-Qiang II models for all tested organic compounds.
Reliable prediction of heat of vaporization of n-alkanes at 298.15 K
JOVAN D. JOVANOVI,DU?AN K. GROZDANI?
Journal of the Serbian Chemical Society , 2010,
Abstract: A reliable model for the prediction of the heat of vaporization for n-alkanes at 298.15 K with the number of carbon atoms and normal boiling point as the only input parameters is recommended. The new model is compared with other literature models and was found to give the best results with absolute mean percentage deviation of 0.81 % and maximum absolute percentage deviation of 2.93 %.
Slowing down of chronic renal failure progression with captopril in spontaneously hypertensive rats with adriamycin nephropathy
Jovanovi? Dijana B.,Jovovi? ?ur?ica,Varagi? Jasmina,Dimitrijevi? Jovan
Srpski Arhiv za Celokupno Lekarstvo , 2002, DOI: 10.2298/sarh0204073j
Abstract: In SHRs with ADR nephropathy treatment with captopril normalized systemic blood pressure, and slowed down CRF progression in their early stage. These functional changes correlate with significant slowing of glomerular and interstitial changes.
Colorectal anastomosis dehiscence following radical surgical operation for rectal carcinoma
Trifunovi? Bratislav,Deli? Jovan,Mirkovi? Darko,Jovanovi? Milan
Vojnosanitetski Pregled , 2011, DOI: 10.2298/vsp1110856t
Abstract: Background/Aim. Colorectal cancer (CRC) is one of the biggest health problems of modern humanity, especially in highly developed countries. In Serbia about 3,200 patients suffer from CRC, out of whom about 1,100 patients suffer from rectal cancer (RC), while about 2,100 patients suffer from other colon segments cancer. The aim of the study was to show the incidence genesis of one of the possible early postoperative complications regarding dehiscence of the colorectal anastomosis (CRA) with a group of patients suffering from RC and operated by using sphincter-saving procedures, in the period from 1993 to 2007, and then to compare the incidence genesis of these complications with those in the published series of the reporting colorectal institutions. Methods. The research included 242 patients radically operated on for RC in a 15-year period using some of sphincter-saving procedures following by a careful analysis of the symptoms of subclinical dehyscencias not solved with the reintervention as well as of the clinically evidented dehyscencias mostly solved by reoperation. Results. With 22 (9.1%) patients in the first 10 postoperative days there were early postoperative symptoms of CRA dehiscence. In 6 (2.47%) of the patients there were subclinical signs of raised body temperature, less quantity of feces content, and after the conservative treatment they ended in spontaneous process of rehabilitation. In 16 (6.61%) patients there was clinically evidented anastomosis dehiscence followed by abundant drainage of feces content, signs of local peritonitis, pelvic sepsis, so we had to undertake surgical intervention. Conclusion. Comparing the results of a few tenths of published studies with our results we proved that performing and operative technique of colorectal anastomosis in the patients suffered and radically surgically treated for RC, is quite adequate with the operative technique in reporting world institutions that are engaged in surgical treatment of RC.
Frequency of occupational injuries and the health status of workers
Jovanovi? Jovica M.,Jovanovi? Milan
Medicinski Pregled , 2004, DOI: 10.2298/mpns0412536j
Abstract: Introduction Occupational injuries are the leading cause of morbidity and mortality among workers. The aim of this study was to analyze the frequency of occupational injuries and health status of workers. Material and methods The examined group consisted of 3.750 workers with health disorders. The control group included 1.800 healthy workers. Both groups were similar in terms of many factors that could contribute to the occurrence of occupational injuries. The injury rates were calculated in both groups. Results Workers with psychomotor and sensorimotor disorders, neuroses, obstructive sleep apnea, arterial hypertension, diabetes mellitus, hearing, vascular and sight impairments have been frequently injured compared to workers with other diseases. Discussion Due to the belief that accidents and occupational injuries are preventable, it is an imperative to study those factors which are likely to contribute to occurrence of accidents. The contributing factors could be the physical and mental state of workers. Conclusion Occupational injuries are significantly more common in the examined group than in controls.
Neurotoxic effects of organic solvents among workers in paint and lacquer manufacturing industry
Jovanovi? Jovica M.,Jovanovi? Milan
Medicinski Pregled , 2004, DOI: 10.2298/mpns0402022j
Abstract: Introduction Organic solvents are chemically different compounds with one common feature: they dissolve fats, oils, resins, cellulose acetate and cellulose nitrate, which makes them widely used in industry. Most often organic solvents are used in paint and lacquer industries, in production of pesticides, plastics, explosives, rubber, cellulose, air conditioners, in pharmaceutical industry and in leather industry. The aim of this research was to analyze the working environment and professional hazards in paint and lacquer manufacturing industry and evaluate effects of chronic exposure to mixture of organic solvents on nervous system of exposed workers. Methodology The exposed group consisted of 50 workers professionally exposed to these noxae, while the control group consisted of 30 workers who have never been exposed to these noxae. Results Examination of working environment in departments of paint and lacquer manufacturing revealed presence of white spirit and toluene above allowed levels. Exposed workers more frequently complained of fatigue, hand numbness, enhanced excitation, and concentration difficulties, forgetfulness and headaches, than workers from the control group. Electroneurographic examination of n. medianus showed reduced motor and sensitive conduction velocity among exposed in comparison to workers from the control group. Reduced motor and sensitive conduction velocity was correlated with duration of exposure to these noxae. Terminal latency of n. medianus was statistically, significantly longer in the exposed group than in the control group. Workers in the exposed group have statistically significantly longer reaction time in response to acoustic and visual stimuli. Discussion Segmental demyelination and axonal degeneration, as forms of damage to peripheral nerves, were identified as responsible for peripheral neuropathy associated with occupational exposure to organic solvents. Conclusion Results of this study show possible neurotoxic effects of noxae detected in the phase of analysis of working conditions and working environment of examined workers.
Occupational stress and arterial hypertension
Jovanovi? Jovica M.,Jovanovi? Milan
Medicinski Pregled , 2004, DOI: 10.2298/mpns0404153j
Abstract: Introduction Arterial hypertension is an important medical, social and economic problem in the working population. Factors of occupational exposure lead to a much faster and more frequent occurrence of this disease and its consequential complications. Among these factors the following take an important place: noise, carbon monoxide, job dissatisfaction, microclimate conditions, chemical agents, shift work, night work, monotonous work and so on. The purpose of this study was to analyze working conditions, working environment, work demands and identification of occupational Stressors and their influence on development of arterial hypertension. Material and methods This investigation included 3470 workers and it examined technological processes, working time, job satisfaction, interpersonal relations and physical and chemical hazards of their workplaces. The exposed group consisted of 2270 workers occupationally exposed to Stressors. Control group included 1200 workers whose workplaces were without Stressors. Workers of exposed group were divided into 14 subgroups in regard to presence of occupational hazards. Results Arterial hypertension was established in 39.9% of workers of exposed group, which is statistically significantly more than in controls (25.7%). The highest prevalence of arterial hypertension was at workers who were dissatisfied with the job and who were at the same time occupationally exposed to noise and carbon monoxide. Family predisposition and smoking have cumulative effects with occupational hazards. Discussion Possible mechanisms of arterial hypertension development include activation of adrenergic nervous system, renin-angiotensin aldosteron system, higher concentrations of steroids, catecholamines and free radicals caused by occupational hazards. Conclusion Occupational Stressors are significant factors in development of arterial hypertension of exposed workers. The most important Stressors are noise, carbon monoxide and job dissatisfaction.
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