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Search Results: 1 - 10 of 1017 matches for " MIRJANA KIJEVCANIN "
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Energy and economy savings in the process of methanol synthesis using Pinch technology
MIRJANA KIJEVCANIN,BOJAN DJORDJEVIC,OZREN OCIC,MLADEN CRNOMARKOVIC
Journal of the Serbian Chemical Society , 2004,
Abstract: A heat exchanger network (HEN) for the process of methanol synthesis has been studied by pinch design analysis. Great economic and energy savings were realized by the pinch analysis in comparison to the existing plant. Also, it was found that it is possible to reduce the requirements for the consumption of utilities. The HEN was reconstruded by adding new heat exchangers. In order to produce new HEN, the capital costs had to be increased, but the total cost trade-off between the capital and energy costs will be decrease by 30 %.
Application of the MvdW1 and HVOS-NRTL mixing rules to the simultaneous correlation of excess enthalpies and W-shaped excess heat capacities data of 1,3-dioxolane + n-alkane systems
BOJAN D. DJORDJEVIC,MIRJANA LJ. KIJEVCANIN,ALEKSANDAR Z. TASIC,SLOBODAN P. SERBANOVIC
Journal of the Serbian Chemical Society , 1999,
Abstract: The Peng-Robinson-Stryjek-Vera (PRSV) equation of state (EOS) coupled with a modified two parameter van der Waals one-fluid mixing rule (MvdW1) and the Huron-Vidal-Orbey-Sandler mixing rule incorporating the NRTL equation as a GE model was used for the correlation of excess enthalpy (HE), excess heat capacity (CpE) and the simultaneous correlation of both properties. All calculations with temperature dependent parameters of EOS models were applied to 1,3-dioxolane+n-alkane systems. The correlation of the HE and CpE data alone with four coefficients and the HE+CpE data with six coefficients of the temperature dependent parameters of the HVOS-NRTL models could be considered as very satisfactory.
Simultaneous correlation of VLE, HE and cpE of some diether + n-alkane systems by the Kohler polynomial
MIRJANA LJ. KIJEVCANIN,SLOBODAN P. SERBANOVIC,IVONA R. RADOVIC,BOJAN D. DJORDJEVIC
Journal of the Serbian Chemical Society , 2006,
Abstract: The simultaneous correlation of VLE and excess properties (HE, cPE) for diether + n-alkane systems was performed in our previous paper by the cubic equation of state which incorporates the activity coefficient model (CEOS/GE).With the same aim, in the present work, a completely different approach based on a polynomial equation (Kohler model) was considered. Thismethod gave results on the same systems which could be estimated as being comparable to GEOS/GE models for the simultaneous correlation of two and, with considerably improved fits, of three properties.
Excess molar volume of the acetonitrile + alcohol systems at 298.15 K. Part I: Density measurements for acetonitrile + methanol, + ethanol systems
IVONA R. GRGURIC,ALEKSANDAR Z. TASIC,BOJAN D. DJORDJEVIC,MIRJANA LJ. KIJEVCANIN
Journal of the Serbian Chemical Society , 2002,
Abstract: The excess molar volume VE of the binary liquid systems acetonitrile + methanol and acetonitrile + ethanol has been evaluated from density measurements at 298.15 K and at atmospheric pressure over the entire composition range. A vibrating tube densimeter, type Anton Paar DMA 55, was applied for these measurements. The Redlich Kister equation was used to fit the experimental VE data.
Mixing rules for excess free energy models (REVIEW)
BOJAN D. DJORDJEVIC,MIRJANA LJ. KIJEVCANIN,JADRANKA P. ORLOVIC,SLOBODAN P. SERBANOVIC
Journal of the Serbian Chemical Society , 2001,
Abstract: 1. Introduction 2. Huron-Vidal mixing rule (HV) 3. MHV1, MHV2 mixing rules 4. Wong-Sandler mixing rule 5. LCVM mixing rule (WS) 6. Huron-Vidal-Orbey-Sandler mixing rule (HVOS) 7. Predictive CEOS/GE models. PSRK model 8. Twu et al. mixing rules 9. VLE calculation in polymer solutions using EOS/GE models 10. Summary
Simultaneous correlation of the excess enthalpy and W-shaped excess heat capacity of 1,4-dioxane+n-alkane systems by PRSV-HVOS CEOS
MIRJANA LJ. KIJEVCANIN,ALEKSANDAR B. DJORDJEVIC,IVONA R. GRGURIC,BOJAN D. DJORDJEVIC
Journal of the Serbian Chemical Society , 2003,
Abstract: In this work the Peng-Robinson-Stryjek-Vera (PRSV) equation of state coupled with the Huron-Vidal-Orbey-Sandler (HVOS) rule was tested for the correlation of the excess enthalpy (HE) and the excess heat capacity (cpE) alone and simultaneously. The HVOS mixing rule incorporates the NRTL equation as the GE model. All calculations were performed using the linear and reciprocal forms of the temperature dependent parameters of the models. For all the evaluations the 1,4-dioxane+n-alkane systems were chosen having in mind the unusually W-shaped concentration dependence of cpE for these systems. The correlation of the HE and cpE data alone for all the investigated systems using four coefficients and for the simultaneous correlation of HE+cpE data using six coefficients of the temperature dependent parameters of the PRSV-HVOS models could be considered as being very satisfactory.
Excess molar volume of acetonitrile + alcohol systems at 298.15 K. Part II: Correlation by cubic equation of state
IVONA R. GRGURIC,MIRJANA LJ. KIJEVCANIN,BOJAN D. DJORDJEVIC,ALEKSANDAR Z. TASIC
Journal of the Serbian Chemical Society , 2003,
Abstract: The excess molar volume VE of the binary liquid systems acetonitrile + methanol and acetonitrile + ethanol, experimentally determined in the previous part, were correlated by the PRSV CEOS coupled with the vdW and TCBT mixing rules. The results obtained show that the number and position of the interaction parameters of these models are of great importance for a satisfactory fitting of VE data.
Mobile and Terrestrial but Firmly Rooted on the River Banks: Biological Anthropology of Lepenski Vir and the Iron Gates Gorge Mesolithic  [PDF]
Mirjana Roksandic
Advances in Anthropology (AA) , 2012, DOI: 10.4236/aa.2012.23014
Abstract: Archaeological interpretation often links both the European Mesolithic and the complexity with reduced mobility and permanent or semi-permanent settlements. The Iron Gates Gorge (IGG) Mesolithic, on the banks of the Danube, with substantial formal disposal areas for the dead and canonized architecture, especially as manifested at the site of Lepenski Vir, fully conforms to this notion. Different aspects of bioarchaeological analysis – when evaluated concurrently – offer a counter-intuitive picture: at the time of its most complex development, the site of Lepenski Vir represented a focal point for a larger, more mobile hunter-gatherer group that identified with the site, its burials and its smaller resident population. The article explores the evidence provided by human skeletal remains and possible reasons behind these contradictory results.
The Reconstruction of Sociology in Eastern Europe—Expectations and Dilemmas  [PDF]
Mirjana Ule
Sociology Mind (SM) , 2014, DOI: 10.4236/sm.2014.44027
Abstract: The article raises two questions: why do sociologists in Western Europe hold expectations of theoretical innovations in sociology in (post-)transitional Eastern European countries, and why is it that sociologists from Eastern Europe do not meet these expectations. The assumption is that these expectations are primarily a response to the theoretical crisis of modern sociology itself, rather than the effect of its knowledge of changes in transitional countries or its willingness to really listen to sociologists from those countries and accept them as equal partners. The attempt to answer the second question involves an analysis of the multilayered reality of sociology in post-socialism, including the loss of the socialist and civil-society utopias which have been replaced by pragmatic endeavors to re-establish a market society and its institutions. Despite the differences between the social situations in the East and West, today’s “Eastern” and “Western” social scientists are confronted by similar global problems and challenges. While the present crisis of the capitalist economy and neo-liberalism certainly has its structural causes, what needs to be questioned here are the very assumptions underlying the world order and the key mechanisms of its functioning.
The Nature, Sources, Detections and Regulations of Mycotoxins That Contaminate Foods and Feeds Causing Health Hazards for Both Human and Animals  [PDF]
Osama O. Ibrahim, Mirjana Menkovska
Journal of Agricultural Chemistry and Environment (JACEN) , 2019, DOI: 10.4236/jacen.2019.81004
Abstract: Mycotoxins are toxic secondary metabolites produced by fungus kingdom. Fungi (molds) under aerobic and optimum conditions of humidity and temperature consume nutrients for proliferation and mycotoxin production (secretion). There are seven major groups of mycotoxins produced by different species of toxigenic fungal genus. Mycotoxins production from these toxigenic fungi depends on the surrounding intrinsic and extrinsic environments. These seven mycotoxins groups that contaminate grains, foods and animal feeds are: Aflatoxins, Trichothecene, Ochratoxins, Ergot alkaloid (Ergolin), Fumonisins, Patulin, and Zearalenone. These mycotoxins are capable of causing health hazards and death for both human and animals by effecting mammalian cells, causing a number of problems in normal cell function and a wide variety of clinical symptoms of diseases. These mycotoxins are varied in their toxicity depending on the infected host (human or animal) and the host susceptibility (immunity). The major concern of food and feed industries is the contamination of food products and animal feed supplies by these mycotoxins. Worldwide Health Organization (WHO), and Food and Agriculture Organization (FAO) are responsible to regulate the acceptable (tolerable) levels of these mycotoxins in grains, food and feed supplies to ensure the safety and health for both human and animals. Understanding fungal ecology and factors that affect fungal proliferation and mycotoxins production by these toxigenic fungi in agriculture crops as raw materials for both human food and animal feed products, plus understanding the chemistry and property of these mycotoxins, methods of detection, illness symptoms, and comply with regulatory guidance established by World Health Organization (WHO)/Food and Agriculture Organization (FAO) are key factors to prevent or minimize foods/feeds contamination and the toxicity of these mycotoxins for both human and animals health, plus reducing economical loss.
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