TY  - JOUR
AU  - Gospavić, Radovan
AU  - Knoll, Peter
AU  - Mirzaei, Siroos
AU  - Popov, Viktor
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1070
AB  - OBJECTIVES: The objectives of this work was to assess the benefits of the application of Physiologically Based Pharmacokinetic (PBPK) models in patients with different neuroendocrine tumours (NET) who were treated with Lu-177 DOTATATE. The model utilises clinical data on biodistribution of radiolabeled peptides (RLPs) obtained by whole body scintigraphy (WBS) of the patients. METHODS: The blood flow restricted (perfusion rate limited) type of the PBPK model for biodistribution of radiolabeled peptides (RLPs) in individual human organs is based on the multi-compartment approach, which takes into account the main physiological processes in the organism: absorption, distribution, metabolism and excretion (ADME). The approach calibrates the PBPK model for each patient in order to increase the accuracy of the dose estimation. Datasets obtained using WBS in four patients have been used to obtain the unknown model parameters. The scintigraphic data were acquired using a double head gamma camera in patients with different neuroendocrine tumours who were treated with Lu-177 DOTATATE. The activity administered to each patient was 7400 MBq. RESULTS: Satisfactory agreement of the model predictions with the data obtained from the WBS for each patient has been achieved. CONCLUSION: The study indicates that the PBPK model can be used for more accurate calculation of biodistribution and absorbed doses in patients. This approach is the first attempt of utilizing scintigraphic data in PBPK models, which was obtained during Lu-177 peptide therapy of patients with NET.
T2  - Asia Oceania Journal of Nuclear Medicine & Biology
T1  - Physiologically Based Pharmacokinetic (PBPK) Model for Biodistribution of Radiolabeled Peptides in Patients with Neuroendocrine Tumours
EP  - 97
IS  - 2
SP  - 90
VL  - 4
DO  - 10.7508/aojnmb.2016.02.005
ER  - 

@article{
author = "Gospavić, Radovan and Knoll, Peter and Mirzaei, Siroos and Popov, Viktor",
year = "2016",
abstract = "OBJECTIVES: The objectives of this work was to assess the benefits of the application of Physiologically Based Pharmacokinetic (PBPK) models in patients with different neuroendocrine tumours (NET) who were treated with Lu-177 DOTATATE. The model utilises clinical data on biodistribution of radiolabeled peptides (RLPs) obtained by whole body scintigraphy (WBS) of the patients. METHODS: The blood flow restricted (perfusion rate limited) type of the PBPK model for biodistribution of radiolabeled peptides (RLPs) in individual human organs is based on the multi-compartment approach, which takes into account the main physiological processes in the organism: absorption, distribution, metabolism and excretion (ADME). The approach calibrates the PBPK model for each patient in order to increase the accuracy of the dose estimation. Datasets obtained using WBS in four patients have been used to obtain the unknown model parameters. The scintigraphic data were acquired using a double head gamma camera in patients with different neuroendocrine tumours who were treated with Lu-177 DOTATATE. The activity administered to each patient was 7400 MBq. RESULTS: Satisfactory agreement of the model predictions with the data obtained from the WBS for each patient has been achieved. CONCLUSION: The study indicates that the PBPK model can be used for more accurate calculation of biodistribution and absorbed doses in patients. This approach is the first attempt of utilizing scintigraphic data in PBPK models, which was obtained during Lu-177 peptide therapy of patients with NET.",
journal = "Asia Oceania Journal of Nuclear Medicine & Biology",
title = "Physiologically Based Pharmacokinetic (PBPK) Model for Biodistribution of Radiolabeled Peptides in Patients with Neuroendocrine Tumours",
pages = "97-90",
number = "2",
volume = "4",
doi = "10.7508/aojnmb.2016.02.005"
}

Gospavić, R., Knoll, P., Mirzaei, S.,& Popov, V.. (2016). Physiologically Based Pharmacokinetic (PBPK) Model for Biodistribution of Radiolabeled Peptides in Patients with Neuroendocrine Tumours. in Asia Oceania Journal of Nuclear Medicine & Biology, 4(2), 90-97.
https://doi.org/10.7508/aojnmb.2016.02.005

Gospavić R, Knoll P, Mirzaei S, Popov V. Physiologically Based Pharmacokinetic (PBPK) Model for Biodistribution of Radiolabeled Peptides in Patients with Neuroendocrine Tumours. in Asia Oceania Journal of Nuclear Medicine & Biology. 2016;4(2):90-97.
doi:10.7508/aojnmb.2016.02.005 .

Gospavić, Radovan, Knoll, Peter, Mirzaei, Siroos, Popov, Viktor, "Physiologically Based Pharmacokinetic (PBPK) Model for Biodistribution of Radiolabeled Peptides in Patients with Neuroendocrine Tumours" in Asia Oceania Journal of Nuclear Medicine & Biology, 4, no. 2 (2016):90-97,
https://doi.org/10.7508/aojnmb.2016.02.005 . .

TY  - JOUR
AU  - Margeirsson, Bjorn
AU  - Palsson, Halldor
AU  - Gospavić, Radovan
AU  - Popov, Viktor
AU  - Jonsson, Magnus Por
AU  - Arason, Sigurjon
PY  - 2012
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/428
AB  - Temperature variations in cod fillets packaged in four levels of EPS boxes stored on pallets under thermal load were studied numerically and experimentally. In the experiment the fillet temperature along with environmental temperature were monitored at 39 positions on the pallets during 9-h dynamic temperature storage between 7 and 23 degrees C. A three-dimensional time-dependent heat transfer model was developed using the ANSYS FLUENT Computational Fluid Dynamics (CFD) software. The overall mean absolute error of the model was 0.3 degrees C and the maximum error obtained at a single position over the whole period was 2.4 degrees C. The model was further developed in order to simulate temperature evolution inside a fully loaded, 12-level pallet under the same dynamic temperature conditions as a four-level pallet studied before. The mean temperature after 9-h thermal load was 1.0 degrees C lower in the 12-level pallet but the maximum temperature evolution was similar in both pallets. Finally, the model was used to investigate the temperature-maintaining effect of superchilling fish before the thermal load.
T2  - Journal of Food Engineering
T1  - Numerical modelling of temperature fluctuations of chilled and superchilled cod fillets packaged in expanded polystyrene boxes stored on pallets under dynamic temperature conditions
EP  - 99
IS  - 1
SP  - 87
VL  - 113
DO  - 10.1016/j.jfoodeng.2012.05.017
ER  - 

@article{
author = "Margeirsson, Bjorn and Palsson, Halldor and Gospavić, Radovan and Popov, Viktor and Jonsson, Magnus Por and Arason, Sigurjon",
year = "2012",
abstract = "Temperature variations in cod fillets packaged in four levels of EPS boxes stored on pallets under thermal load were studied numerically and experimentally. In the experiment the fillet temperature along with environmental temperature were monitored at 39 positions on the pallets during 9-h dynamic temperature storage between 7 and 23 degrees C. A three-dimensional time-dependent heat transfer model was developed using the ANSYS FLUENT Computational Fluid Dynamics (CFD) software. The overall mean absolute error of the model was 0.3 degrees C and the maximum error obtained at a single position over the whole period was 2.4 degrees C. The model was further developed in order to simulate temperature evolution inside a fully loaded, 12-level pallet under the same dynamic temperature conditions as a four-level pallet studied before. The mean temperature after 9-h thermal load was 1.0 degrees C lower in the 12-level pallet but the maximum temperature evolution was similar in both pallets. Finally, the model was used to investigate the temperature-maintaining effect of superchilling fish before the thermal load.",
journal = "Journal of Food Engineering",
title = "Numerical modelling of temperature fluctuations of chilled and superchilled cod fillets packaged in expanded polystyrene boxes stored on pallets under dynamic temperature conditions",
pages = "99-87",
number = "1",
volume = "113",
doi = "10.1016/j.jfoodeng.2012.05.017"
}

Margeirsson, B., Palsson, H., Gospavić, R., Popov, V., Jonsson, M. P.,& Arason, S.. (2012). Numerical modelling of temperature fluctuations of chilled and superchilled cod fillets packaged in expanded polystyrene boxes stored on pallets under dynamic temperature conditions. in Journal of Food Engineering, 113(1), 87-99.
https://doi.org/10.1016/j.jfoodeng.2012.05.017

Margeirsson B, Palsson H, Gospavić R, Popov V, Jonsson MP, Arason S. Numerical modelling of temperature fluctuations of chilled and superchilled cod fillets packaged in expanded polystyrene boxes stored on pallets under dynamic temperature conditions. in Journal of Food Engineering. 2012;113(1):87-99.
doi:10.1016/j.jfoodeng.2012.05.017 .

Margeirsson, Bjorn, Palsson, Halldor, Gospavić, Radovan, Popov, Viktor, Jonsson, Magnus Por, Arason, Sigurjon, "Numerical modelling of temperature fluctuations of chilled and superchilled cod fillets packaged in expanded polystyrene boxes stored on pallets under dynamic temperature conditions" in Journal of Food Engineering, 113, no. 1 (2012):87-99,
https://doi.org/10.1016/j.jfoodeng.2012.05.017 . .

TY  - JOUR
AU  - Gospavić, Radovan
AU  - Margeirsson, Bjorn
AU  - Popov, Viktor
PY  - 2012
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/427
AB  - A mathematical model for heat transfer from surrounding environment to a single food package is developed. A simplified analytical solution for three-dimensional (3D) unsteady temperature distribution in the food package with rectangular geometry taking into account the ambient temperature is obtained. The model is developed to be used as an efficient tool for estimating the effects of temperature abuse on the food product inside a single packaging unit. The food product is considered to be a homogenous solid body. The packaging material and air inside the package are modeled using an effective heat transfer coefficient. The developed model is validated by a comparison with experimental results obtained for fresh haddock fillets in expanded polystyrene (EPS) boxes exposed to temperature abuse and by comparison with numerical results obtained by the commercial software FLUENT. A satisfactory agreement was obtained between the experimental and numerical results.
T2  - International Journal of Refrigeration-Revue Internationale Du Froid
T1  - Mathematical model for estimation of the three-dimensional unsteady temperature variation in chilled packaging units
EP  - 1317
IS  - 5
SP  - 1304
VL  - 35
DO  - 10.1016/j.ijrefrig.2012.04.002
ER  - 

@article{
author = "Gospavić, Radovan and Margeirsson, Bjorn and Popov, Viktor",
year = "2012",
abstract = "A mathematical model for heat transfer from surrounding environment to a single food package is developed. A simplified analytical solution for three-dimensional (3D) unsteady temperature distribution in the food package with rectangular geometry taking into account the ambient temperature is obtained. The model is developed to be used as an efficient tool for estimating the effects of temperature abuse on the food product inside a single packaging unit. The food product is considered to be a homogenous solid body. The packaging material and air inside the package are modeled using an effective heat transfer coefficient. The developed model is validated by a comparison with experimental results obtained for fresh haddock fillets in expanded polystyrene (EPS) boxes exposed to temperature abuse and by comparison with numerical results obtained by the commercial software FLUENT. A satisfactory agreement was obtained between the experimental and numerical results.",
journal = "International Journal of Refrigeration-Revue Internationale Du Froid",
title = "Mathematical model for estimation of the three-dimensional unsteady temperature variation in chilled packaging units",
pages = "1317-1304",
number = "5",
volume = "35",
doi = "10.1016/j.ijrefrig.2012.04.002"
}

Gospavić, R., Margeirsson, B.,& Popov, V.. (2012). Mathematical model for estimation of the three-dimensional unsteady temperature variation in chilled packaging units. in International Journal of Refrigeration-Revue Internationale Du Froid, 35(5), 1304-1317.
https://doi.org/10.1016/j.ijrefrig.2012.04.002

Gospavić R, Margeirsson B, Popov V. Mathematical model for estimation of the three-dimensional unsteady temperature variation in chilled packaging units. in International Journal of Refrigeration-Revue Internationale Du Froid. 2012;35(5):1304-1317.
doi:10.1016/j.ijrefrig.2012.04.002 .

Gospavić, Radovan, Margeirsson, Bjorn, Popov, Viktor, "Mathematical model for estimation of the three-dimensional unsteady temperature variation in chilled packaging units" in International Journal of Refrigeration-Revue Internationale Du Froid, 35, no. 5 (2012):1304-1317,
https://doi.org/10.1016/j.ijrefrig.2012.04.002 . .

TY  - JOUR
AU  - Margeirsson, Bjorn
AU  - Palsson, Halldor
AU  - Popov, Viktor
AU  - Gospavić, Radovan
AU  - Arason, Sigurjon
AU  - Sveinsdottir, Kolbrun
AU  - Jonsson, Magnus Por
PY  - 2012
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/426
AB  - An appropriate thermal insulation of fresh fish packaging can substantially reduce negative effects of poor temperature management in chill chains. The aim of the current study is to experimentally and numerically investigate the performance of two types of EPS (expanded polystyrene) boxes in protecting superchilled fresh fish products subjected to temperature fluctuations, simulating conditions during transport. One EPS box type is a new improved version designed by utilising numerical heat transfer modelling for minimising the maximum product temperature during thermal load. This box weighed 11% less than the older box type. The performance of the boxes was evaluated by means of temperature monitoring and sensory evaluation. The thermal insulation of the new boxes was significantly better compared to the old boxes. According to sensory evaluation, storage in the new boxes resulted in approximately 2 days longer storage life. A satisfactory agreement between numerical results and experimental results was obtained.
T2  - International Journal of Refrigeration-Revue Internationale Du Froid
T1  - Numerical modelling of temperature fluctuations in superchilled fish loins packaged in expanded polystyrene and stored at dynamic temperature conditions
EP  - 1326
IS  - 5
SP  - 1318
VL  - 35
DO  - 10.1016/j.ijrefrig.2012.03.016
ER  - 

@article{
author = "Margeirsson, Bjorn and Palsson, Halldor and Popov, Viktor and Gospavić, Radovan and Arason, Sigurjon and Sveinsdottir, Kolbrun and Jonsson, Magnus Por",
year = "2012",
abstract = "An appropriate thermal insulation of fresh fish packaging can substantially reduce negative effects of poor temperature management in chill chains. The aim of the current study is to experimentally and numerically investigate the performance of two types of EPS (expanded polystyrene) boxes in protecting superchilled fresh fish products subjected to temperature fluctuations, simulating conditions during transport. One EPS box type is a new improved version designed by utilising numerical heat transfer modelling for minimising the maximum product temperature during thermal load. This box weighed 11% less than the older box type. The performance of the boxes was evaluated by means of temperature monitoring and sensory evaluation. The thermal insulation of the new boxes was significantly better compared to the old boxes. According to sensory evaluation, storage in the new boxes resulted in approximately 2 days longer storage life. A satisfactory agreement between numerical results and experimental results was obtained.",
journal = "International Journal of Refrigeration-Revue Internationale Du Froid",
title = "Numerical modelling of temperature fluctuations in superchilled fish loins packaged in expanded polystyrene and stored at dynamic temperature conditions",
pages = "1326-1318",
number = "5",
volume = "35",
doi = "10.1016/j.ijrefrig.2012.03.016"
}

Margeirsson, B., Palsson, H., Popov, V., Gospavić, R., Arason, S., Sveinsdottir, K.,& Jonsson, M. P.. (2012). Numerical modelling of temperature fluctuations in superchilled fish loins packaged in expanded polystyrene and stored at dynamic temperature conditions. in International Journal of Refrigeration-Revue Internationale Du Froid, 35(5), 1318-1326.
https://doi.org/10.1016/j.ijrefrig.2012.03.016

Margeirsson B, Palsson H, Popov V, Gospavić R, Arason S, Sveinsdottir K, Jonsson MP. Numerical modelling of temperature fluctuations in superchilled fish loins packaged in expanded polystyrene and stored at dynamic temperature conditions. in International Journal of Refrigeration-Revue Internationale Du Froid. 2012;35(5):1318-1326.
doi:10.1016/j.ijrefrig.2012.03.016 .

Margeirsson, Bjorn, Palsson, Halldor, Popov, Viktor, Gospavić, Radovan, Arason, Sigurjon, Sveinsdottir, Kolbrun, Jonsson, Magnus Por, "Numerical modelling of temperature fluctuations in superchilled fish loins packaged in expanded polystyrene and stored at dynamic temperature conditions" in International Journal of Refrigeration-Revue Internationale Du Froid, 35, no. 5 (2012):1318-1326,
https://doi.org/10.1016/j.ijrefrig.2012.03.016 . .

TY  - JOUR
AU  - Margeirsson, Bjorn
AU  - Lauzon, Helene L.
AU  - Palsson, Halldor
AU  - Popov, Viktor
AU  - Gospavić, Radovan
AU  - Jonsson, Magnus Por
AU  - Sigurgisladottir, Sjofn
AU  - Arason, Sigurjon
PY  - 2012
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/456
AB  - A study was carried out to evaluate temperature variation and quality deterioration of packaged cod fillets as influenced by the box type used and their position on pallets under dynamic temperature storage. Storage life of thermally abused fillets was compared to that of fillets stored at steady temperature. Thermal performance of fish boxes, made of corrugated plastic on one hand and expanded polystyrene on the other hand, was also compared. Fillet temperature at multiple positions on the pallets along with environmental temperature and humidity were monitored during storage. Differences in product temperature of up to 10.5 degrees C were recorded on the thermally abused pallets stored for 6.4 h at mean ambient temperature of 18.5 degrees C. A reduction in storage life of 1.5-3 days was observed depending on the box position on the abused pallets compared to steady temperature storage.
T2  - International Journal of Refrigeration-Revue Internationale Du Froid
T1  - Temperature fluctuations and quality deterioration of chilled cod (Gadus morhua) fillets packaged in different boxes stored on pallets under dynamic temperature conditions
EP  - 201
IS  - 1
SP  - 187
VL  - 35
DO  - 10.1016/j.ijrefrig.2011.09.006
ER  - 

@article{
author = "Margeirsson, Bjorn and Lauzon, Helene L. and Palsson, Halldor and Popov, Viktor and Gospavić, Radovan and Jonsson, Magnus Por and Sigurgisladottir, Sjofn and Arason, Sigurjon",
year = "2012",
abstract = "A study was carried out to evaluate temperature variation and quality deterioration of packaged cod fillets as influenced by the box type used and their position on pallets under dynamic temperature storage. Storage life of thermally abused fillets was compared to that of fillets stored at steady temperature. Thermal performance of fish boxes, made of corrugated plastic on one hand and expanded polystyrene on the other hand, was also compared. Fillet temperature at multiple positions on the pallets along with environmental temperature and humidity were monitored during storage. Differences in product temperature of up to 10.5 degrees C were recorded on the thermally abused pallets stored for 6.4 h at mean ambient temperature of 18.5 degrees C. A reduction in storage life of 1.5-3 days was observed depending on the box position on the abused pallets compared to steady temperature storage.",
journal = "International Journal of Refrigeration-Revue Internationale Du Froid",
title = "Temperature fluctuations and quality deterioration of chilled cod (Gadus morhua) fillets packaged in different boxes stored on pallets under dynamic temperature conditions",
pages = "201-187",
number = "1",
volume = "35",
doi = "10.1016/j.ijrefrig.2011.09.006"
}

Margeirsson, B., Lauzon, H. L., Palsson, H., Popov, V., Gospavić, R., Jonsson, M. P., Sigurgisladottir, S.,& Arason, S.. (2012). Temperature fluctuations and quality deterioration of chilled cod (Gadus morhua) fillets packaged in different boxes stored on pallets under dynamic temperature conditions. in International Journal of Refrigeration-Revue Internationale Du Froid, 35(1), 187-201.
https://doi.org/10.1016/j.ijrefrig.2011.09.006

Margeirsson B, Lauzon HL, Palsson H, Popov V, Gospavić R, Jonsson MP, Sigurgisladottir S, Arason S. Temperature fluctuations and quality deterioration of chilled cod (Gadus morhua) fillets packaged in different boxes stored on pallets under dynamic temperature conditions. in International Journal of Refrigeration-Revue Internationale Du Froid. 2012;35(1):187-201.
doi:10.1016/j.ijrefrig.2011.09.006 .

Margeirsson, Bjorn, Lauzon, Helene L., Palsson, Halldor, Popov, Viktor, Gospavić, Radovan, Jonsson, Magnus Por, Sigurgisladottir, Sjofn, Arason, Sigurjon, "Temperature fluctuations and quality deterioration of chilled cod (Gadus morhua) fillets packaged in different boxes stored on pallets under dynamic temperature conditions" in International Journal of Refrigeration-Revue Internationale Du Froid, 35, no. 1 (2012):187-201,
https://doi.org/10.1016/j.ijrefrig.2011.09.006 . .

TY  - JOUR
AU  - Margeirsson, Björn
AU  - Gospavić, Radovan
AU  - Pálsson, Halldór
AU  - Arason, Sigurjón
AU  - Popov, Viktor
PY  - 2011
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3104
AB  - Experiments were carried out to compare the thermal performance of wholesale fresh fish boxes made of corrugated plastic (CP) and expanded polystyrene (EPS). Free standing boxes containing whole, fresh fillets were exposed to dynamic thermal loads. The chilling effect of frozen ice packs was studied by including them in some of the boxes. The frozen ice packs proved efficient for protecting fresh fish fillets against temperature abuse. Further-more, the results show that the insulating performance of EPS is significantly better than were recorded inside the thermally abused boxes without ice packs, initially at 1.9 to 2.1 °C and stored for 6.1 h at a mean ambient temperature of 19.4 °C. The fish temperature distributions during thermal abuse were studied with a numerical model for both pack-aging types, applying effective thermal properties of the sandwich-structured CP box. The purpose of the model was to cost effectively improve the packaging design. A satisfactory agreement between numerical results and experimental results was obtained.
PB  - Elsevier
T2  - International Journal of Refrigeration
T1  - Experimental and numerical modelling comparison of thermal performance of expanded polystyrene and corrugated plastic packaging for fresh fish
EP  - 585
SP  - 573
VL  - 34
DO  - 10.1016/j.ijrefrig.2010.09.017
ER  - 

@article{
author = "Margeirsson, Björn and Gospavić, Radovan and Pálsson, Halldór and Arason, Sigurjón and Popov, Viktor",
year = "2011",
abstract = "Experiments were carried out to compare the thermal performance of wholesale fresh fish boxes made of corrugated plastic (CP) and expanded polystyrene (EPS). Free standing boxes containing whole, fresh fillets were exposed to dynamic thermal loads. The chilling effect of frozen ice packs was studied by including them in some of the boxes. The frozen ice packs proved efficient for protecting fresh fish fillets against temperature abuse. Further-more, the results show that the insulating performance of EPS is significantly better than were recorded inside the thermally abused boxes without ice packs, initially at 1.9 to 2.1 °C and stored for 6.1 h at a mean ambient temperature of 19.4 °C. The fish temperature distributions during thermal abuse were studied with a numerical model for both pack-aging types, applying effective thermal properties of the sandwich-structured CP box. The purpose of the model was to cost effectively improve the packaging design. A satisfactory agreement between numerical results and experimental results was obtained.",
publisher = "Elsevier",
journal = "International Journal of Refrigeration",
title = "Experimental and numerical modelling comparison of thermal performance of expanded polystyrene and corrugated plastic packaging for fresh fish",
pages = "585-573",
volume = "34",
doi = "10.1016/j.ijrefrig.2010.09.017"
}

Margeirsson, B., Gospavić, R., Pálsson, H., Arason, S.,& Popov, V.. (2011). Experimental and numerical modelling comparison of thermal performance of expanded polystyrene and corrugated plastic packaging for fresh fish. in International Journal of Refrigeration
Elsevier., 34, 573-585.
https://doi.org/10.1016/j.ijrefrig.2010.09.017

Margeirsson B, Gospavić R, Pálsson H, Arason S, Popov V. Experimental and numerical modelling comparison of thermal performance of expanded polystyrene and corrugated plastic packaging for fresh fish. in International Journal of Refrigeration. 2011;34:573-585.
doi:10.1016/j.ijrefrig.2010.09.017 .

Margeirsson, Björn, Gospavić, Radovan, Pálsson, Halldór, Arason, Sigurjón, Popov, Viktor, "Experimental and numerical modelling comparison of thermal performance of expanded polystyrene and corrugated plastic packaging for fresh fish" in International Journal of Refrigeration, 34 (2011):573-585,
https://doi.org/10.1016/j.ijrefrig.2010.09.017 . .

TY  - CONF
AU  - Popov, Viktor
AU  - Lauzon, Helene L.
AU  - Haque, M.N.
AU  - Leroi, F.
AU  - Gospavić, Radovan
PY  - 2011
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/376
AB  - Food-borne listeriosis, caused by Listeria monocytogenes (Lm), is relatively rare but the relatively high rate of fatality (20-30%) compared to other food-borne microbial pathogens such as Salmonella makes it a serious disease. The foodstuff is recognised as the primary route of transmission for human exposure. A wide variety of food or raw material may become contaminated with Lm but the majority of listeriosis cases are related to ready-to-eat (RTE) food. The important factor related to food-borne listeriosis is that Lm can grow under low (refrigerated) temperatures when given sufficient time. Therefore, RTE products with long shelf life are under risk with respect to growth of Lm to critical concentrations. A stochastic model for the growth of Lm with the inhibiting effect of lactic acid bacteria (LAB) in cold smoked salmon (CSS) was developed. An existing deterministic model for the growth of Lm was adapted by adding the Winner stochastic process in order to simulate the growth of Lm. The Poisson distribution is used to represent the initial count (occurrence) of Lm. A deterministic model for growth of LAB is used and the inhibiting effects of Lm and LAB on each other are taken into account. The Beta-Poisson model is used for estimating the dose response. The model has been tested during field trials with CSS performed in August 2010. The salmon was slaughtered in Norway and transported to France where it was processed. The model, implemented within the QMRA module, indicated that growth of Lm would occur in the CSS samples investigated. However, the data obtained during the field trial showed that microbial cell counts implied a reduction in the population of Lm with storage time, which means that a different model to describe the growth of Lm in presence of LAB may be required, especially for lower concentrations of Lm.
C3  - WIT Transactions on Biomedicine and Health
T1  - Evaluation of QMRA performance for Listeria monocytogenes in cold smoked salmon
EP  - 297
SP  - 197
VL  - 15
DO  - 10.2495/EHR110181
ER  - 

@conference{
author = "Popov, Viktor and Lauzon, Helene L. and Haque, M.N. and Leroi, F. and Gospavić, Radovan",
year = "2011",
abstract = "Food-borne listeriosis, caused by Listeria monocytogenes (Lm), is relatively rare but the relatively high rate of fatality (20-30%) compared to other food-borne microbial pathogens such as Salmonella makes it a serious disease. The foodstuff is recognised as the primary route of transmission for human exposure. A wide variety of food or raw material may become contaminated with Lm but the majority of listeriosis cases are related to ready-to-eat (RTE) food. The important factor related to food-borne listeriosis is that Lm can grow under low (refrigerated) temperatures when given sufficient time. Therefore, RTE products with long shelf life are under risk with respect to growth of Lm to critical concentrations. A stochastic model for the growth of Lm with the inhibiting effect of lactic acid bacteria (LAB) in cold smoked salmon (CSS) was developed. An existing deterministic model for the growth of Lm was adapted by adding the Winner stochastic process in order to simulate the growth of Lm. The Poisson distribution is used to represent the initial count (occurrence) of Lm. A deterministic model for growth of LAB is used and the inhibiting effects of Lm and LAB on each other are taken into account. The Beta-Poisson model is used for estimating the dose response. The model has been tested during field trials with CSS performed in August 2010. The salmon was slaughtered in Norway and transported to France where it was processed. The model, implemented within the QMRA module, indicated that growth of Lm would occur in the CSS samples investigated. However, the data obtained during the field trial showed that microbial cell counts implied a reduction in the population of Lm with storage time, which means that a different model to describe the growth of Lm in presence of LAB may be required, especially for lower concentrations of Lm.",
journal = "WIT Transactions on Biomedicine and Health",
title = "Evaluation of QMRA performance for Listeria monocytogenes in cold smoked salmon",
pages = "297-197",
volume = "15",
doi = "10.2495/EHR110181"
}

Popov, V., Lauzon, H. L., Haque, M.N., Leroi, F.,& Gospavić, R.. (2011). Evaluation of QMRA performance for Listeria monocytogenes in cold smoked salmon. in WIT Transactions on Biomedicine and Health, 15, 197-297.
https://doi.org/10.2495/EHR110181

Popov V, Lauzon HL, Haque M, Leroi F, Gospavić R. Evaluation of QMRA performance for Listeria monocytogenes in cold smoked salmon. in WIT Transactions on Biomedicine and Health. 2011;15:197-297.
doi:10.2495/EHR110181 .

Popov, Viktor, Lauzon, Helene L., Haque, M.N., Leroi, F., Gospavić, Radovan, "Evaluation of QMRA performance for Listeria monocytogenes in cold smoked salmon" in WIT Transactions on Biomedicine and Health, 15 (2011):197-297,
https://doi.org/10.2495/EHR110181 . .

TY  - CONF
AU  - Margeirsson, Bjorn
AU  - Palsson, Halldor
AU  - Popov, Viktor
AU  - Gospavić, Radovan
AU  - Arason, Sigurjon
AU  - Sveinsdottir, Kolbrun
AU  - Jonsson, Magnus Por
PY  - 2011
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/371
AB  - Thermal insulation of fresh fish packaging can substantially reduce negative effects of poor temperature management in chill chains. The aim of the current study was to experimentally and numerically investigate the performance of two different types of EPS (expanded polystyrene) boxes in protecting precooled, fresh fish products subjected to temperature fluctuations, simulating real conditions during transport. One EPS box type was a new improved version designed by utilising numerical heat transfer modelling for minimising the maximum product temperature during thermal load and turned out to weigh 11% less than the older EPS box type. The performance of the EPS boxes was evaluated by means of temperature monitoring and sensory evaluation. The thermal performance of the new EPS boxes was significantly better compared to the old boxes. According to sensory evaluation, storage in the new boxes resulted in approximately 2 days longer storage life. A satisfactory agreement between numerical results and experimental results was obtained.
C3  - 23rd Iir International Congress of Refrigeration
T1  - Numerical modelling of temperature fluctuations in superchilled fish loins packaged in expanded polystyrene and stored at dynamic temperature conditions
SP  - 2672
VL  - 23
UR  - https://hdl.handle.net/21.15107/rcub_grafar_371
ER  - 

@conference{
author = "Margeirsson, Bjorn and Palsson, Halldor and Popov, Viktor and Gospavić, Radovan and Arason, Sigurjon and Sveinsdottir, Kolbrun and Jonsson, Magnus Por",
year = "2011",
abstract = "Thermal insulation of fresh fish packaging can substantially reduce negative effects of poor temperature management in chill chains. The aim of the current study was to experimentally and numerically investigate the performance of two different types of EPS (expanded polystyrene) boxes in protecting precooled, fresh fish products subjected to temperature fluctuations, simulating real conditions during transport. One EPS box type was a new improved version designed by utilising numerical heat transfer modelling for minimising the maximum product temperature during thermal load and turned out to weigh 11% less than the older EPS box type. The performance of the EPS boxes was evaluated by means of temperature monitoring and sensory evaluation. The thermal performance of the new EPS boxes was significantly better compared to the old boxes. According to sensory evaluation, storage in the new boxes resulted in approximately 2 days longer storage life. A satisfactory agreement between numerical results and experimental results was obtained.",
journal = "23rd Iir International Congress of Refrigeration",
title = "Numerical modelling of temperature fluctuations in superchilled fish loins packaged in expanded polystyrene and stored at dynamic temperature conditions",
pages = "2672",
volume = "23",
url = "https://hdl.handle.net/21.15107/rcub_grafar_371"
}

Margeirsson, B., Palsson, H., Popov, V., Gospavić, R., Arason, S., Sveinsdottir, K.,& Jonsson, M. P.. (2011). Numerical modelling of temperature fluctuations in superchilled fish loins packaged in expanded polystyrene and stored at dynamic temperature conditions. in 23rd Iir International Congress of Refrigeration, 23, 2672.
https://hdl.handle.net/21.15107/rcub_grafar_371

Margeirsson B, Palsson H, Popov V, Gospavić R, Arason S, Sveinsdottir K, Jonsson MP. Numerical modelling of temperature fluctuations in superchilled fish loins packaged in expanded polystyrene and stored at dynamic temperature conditions. in 23rd Iir International Congress of Refrigeration. 2011;23:2672.
https://hdl.handle.net/21.15107/rcub_grafar_371 .

Margeirsson, Bjorn, Palsson, Halldor, Popov, Viktor, Gospavić, Radovan, Arason, Sigurjon, Sveinsdottir, Kolbrun, Jonsson, Magnus Por, "Numerical modelling of temperature fluctuations in superchilled fish loins packaged in expanded polystyrene and stored at dynamic temperature conditions" in 23rd Iir International Congress of Refrigeration, 23 (2011):2672,
https://hdl.handle.net/21.15107/rcub_grafar_371 .

TY  - JOUR
AU  - Popov Janevska, Daniela
AU  - Gospavić, Radovan
AU  - Pacholewicz, Ewa
AU  - Popov, Viktor
PY  - 2010
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3103
AB  - The work presented focuses on predictive modelling for estimating the risk to consumers due to con-sumption of food contaminated with Specific Foodborne Pathogens (SFP) or estimating the remaining shelf life of the product. An approach based on integration of the existing Hazard Analysis and Critical Control Point (HACCP) approach with the Quantitative Microbial Risk Assessment (QMRA) is presented which is developed as part of the Chill-On EC FP6 research project. The paper describes the main princi-ples of operation of the system and introduces elements of practical implementation and operation of the HACCP system combined with QMRA as well as a Shelf Life Predictor (SLP). The possibility for managing the impact of climate change by using HACCP–QMRA–SLP in supply chains is discussed.
PB  - Elsevier
T2  - Food Research International
T1  - Application of a HACCP–QMRA approach for managing the impact of climate change on food quality and safety
EP  - 1924
SP  - 1915
VL  - 43
DO  - 10.1016/j.foodres.2010.01.025
ER  - 

@article{
author = "Popov Janevska, Daniela and Gospavić, Radovan and Pacholewicz, Ewa and Popov, Viktor",
year = "2010",
abstract = "The work presented focuses on predictive modelling for estimating the risk to consumers due to con-sumption of food contaminated with Specific Foodborne Pathogens (SFP) or estimating the remaining shelf life of the product. An approach based on integration of the existing Hazard Analysis and Critical Control Point (HACCP) approach with the Quantitative Microbial Risk Assessment (QMRA) is presented which is developed as part of the Chill-On EC FP6 research project. The paper describes the main princi-ples of operation of the system and introduces elements of practical implementation and operation of the HACCP system combined with QMRA as well as a Shelf Life Predictor (SLP). The possibility for managing the impact of climate change by using HACCP–QMRA–SLP in supply chains is discussed.",
publisher = "Elsevier",
journal = "Food Research International",
title = "Application of a HACCP–QMRA approach for managing the impact of climate change on food quality and safety",
pages = "1924-1915",
volume = "43",
doi = "10.1016/j.foodres.2010.01.025"
}

Popov Janevska, D., Gospavić, R., Pacholewicz, E.,& Popov, V.. (2010). Application of a HACCP–QMRA approach for managing the impact of climate change on food quality and safety. in Food Research International
Elsevier., 43, 1915-1924.
https://doi.org/10.1016/j.foodres.2010.01.025

Popov Janevska D, Gospavić R, Pacholewicz E, Popov V. Application of a HACCP–QMRA approach for managing the impact of climate change on food quality and safety. in Food Research International. 2010;43:1915-1924.
doi:10.1016/j.foodres.2010.01.025 .

Popov Janevska, Daniela, Gospavić, Radovan, Pacholewicz, Ewa, Popov, Viktor, "Application of a HACCP–QMRA approach for managing the impact of climate change on food quality and safety" in Food Research International, 43 (2010):1915-1924,
https://doi.org/10.1016/j.foodres.2010.01.025 . .

TY  - JOUR
AU  - Gospavić, Radovan
AU  - Popov, Viktor
AU  - Todorović, Goran
PY  - 2008
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/193
AB  - Using the boundary element dual reciprocity method-multi-domain (DRM-MD) a bound electron states and corresponding wave functions in semiconductor quantum wires embedded in a matrix were considered. The single circular and rectangular as well as the two near circular quantum wires were analyzed. In the case of two coupled quantum wires the dependence of the resulting wave function and eigenenergies as a function of the distance between wires was calculated. The DRM-MD gave a linear electron state model and developed numerical approach accurately captured the symmetry breaking and splitting of the degenerated energy states due to presence of additional wire. According to the symmetry of the structures a suitable mesh reduction was employed and different modes were considered separately. For a case of hetero-structures domain decomposition was used.
T2  - Computer Physics Communications
T1  - Boundary element-dual reciprocity formulation for bound electron states in semiconductor quantum wires
EP  - 373
IS  - 5
SP  - 366
VL  - 178
DO  - 10.1016/j.cpc.2007.09.009
ER  - 

@article{
author = "Gospavić, Radovan and Popov, Viktor and Todorović, Goran",
year = "2008",
abstract = "Using the boundary element dual reciprocity method-multi-domain (DRM-MD) a bound electron states and corresponding wave functions in semiconductor quantum wires embedded in a matrix were considered. The single circular and rectangular as well as the two near circular quantum wires were analyzed. In the case of two coupled quantum wires the dependence of the resulting wave function and eigenenergies as a function of the distance between wires was calculated. The DRM-MD gave a linear electron state model and developed numerical approach accurately captured the symmetry breaking and splitting of the degenerated energy states due to presence of additional wire. According to the symmetry of the structures a suitable mesh reduction was employed and different modes were considered separately. For a case of hetero-structures domain decomposition was used.",
journal = "Computer Physics Communications",
title = "Boundary element-dual reciprocity formulation for bound electron states in semiconductor quantum wires",
pages = "373-366",
number = "5",
volume = "178",
doi = "10.1016/j.cpc.2007.09.009"
}

Gospavić, R., Popov, V.,& Todorović, G.. (2008). Boundary element-dual reciprocity formulation for bound electron states in semiconductor quantum wires. in Computer Physics Communications, 178(5), 366-373.
https://doi.org/10.1016/j.cpc.2007.09.009

Gospavić R, Popov V, Todorović G. Boundary element-dual reciprocity formulation for bound electron states in semiconductor quantum wires. in Computer Physics Communications. 2008;178(5):366-373.
doi:10.1016/j.cpc.2007.09.009 .

Gospavić, Radovan, Popov, Viktor, Todorović, Goran, "Boundary element-dual reciprocity formulation for bound electron states in semiconductor quantum wires" in Computer Physics Communications, 178, no. 5 (2008):366-373,
https://doi.org/10.1016/j.cpc.2007.09.009 . .

TY  - JOUR
AU  - Gospavić, Radovan
AU  - Kreyenschmidt, Judith
AU  - Bruckner, Stefanie
AU  - Popov, Viktor
AU  - Haque, Nasimul
PY  - 2008
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3102
AB  - A dynamic growth model under variable temperature conditions was implemented and calibrated using raw data for microbial growth of Pseudomonas spp. in poultry under aerobic conditions. The primary model was implemented using measurement data under a set of fixed temperatures. The two primary models used for predicting the growth under constant temperature conditions were: Baranyi and modified Gompertz. For the
Baranyi model the maximum specific growth rate and the lag phase at constant environmental conditions are expressed in exact form and it has been shown that in limit case when maximal cells concentration is much higher than the initial concentration the maximum specific growth rate is approximately equal to the specific growth rate. The model parameters are determined in a temperature range of 2–20 °C. As a secondary model the square root model was used for maximum specific growth rate in both models.
In both models the main assumption, that the initial physiological state of the inoculum is constant and independent of the environmental parameters, is used, and a free parameter was implemented which was determined by minimizing the mean square error (MSE) relative to the measurement data. Two temperature profiles were used for calibration of the models on the initial conditions of the cells.
PB  - Elsevier
T2  - International Journal of Food Microbiology
T1  - Mathematical modelling for predicting the growth of Pseudomonas spp. in poultry under variable temperature conditions
EP  - 297
SP  - 290
VL  - 127
DO  - 10.1016/j.ijfoodmicro.2008.07.022
ER  - 

@article{
author = "Gospavić, Radovan and Kreyenschmidt, Judith and Bruckner, Stefanie and Popov, Viktor and Haque, Nasimul",
year = "2008",
abstract = "A dynamic growth model under variable temperature conditions was implemented and calibrated using raw data for microbial growth of Pseudomonas spp. in poultry under aerobic conditions. The primary model was implemented using measurement data under a set of fixed temperatures. The two primary models used for predicting the growth under constant temperature conditions were: Baranyi and modified Gompertz. For the
Baranyi model the maximum specific growth rate and the lag phase at constant environmental conditions are expressed in exact form and it has been shown that in limit case when maximal cells concentration is much higher than the initial concentration the maximum specific growth rate is approximately equal to the specific growth rate. The model parameters are determined in a temperature range of 2–20 °C. As a secondary model the square root model was used for maximum specific growth rate in both models.
In both models the main assumption, that the initial physiological state of the inoculum is constant and independent of the environmental parameters, is used, and a free parameter was implemented which was determined by minimizing the mean square error (MSE) relative to the measurement data. Two temperature profiles were used for calibration of the models on the initial conditions of the cells.",
publisher = "Elsevier",
journal = "International Journal of Food Microbiology",
title = "Mathematical modelling for predicting the growth of Pseudomonas spp. in poultry under variable temperature conditions",
pages = "297-290",
volume = "127",
doi = "10.1016/j.ijfoodmicro.2008.07.022"
}

Gospavić, R., Kreyenschmidt, J., Bruckner, S., Popov, V.,& Haque, N.. (2008). Mathematical modelling for predicting the growth of Pseudomonas spp. in poultry under variable temperature conditions. in International Journal of Food Microbiology
Elsevier., 127, 290-297.
https://doi.org/10.1016/j.ijfoodmicro.2008.07.022

Gospavić R, Kreyenschmidt J, Bruckner S, Popov V, Haque N. Mathematical modelling for predicting the growth of Pseudomonas spp. in poultry under variable temperature conditions. in International Journal of Food Microbiology. 2008;127:290-297.
doi:10.1016/j.ijfoodmicro.2008.07.022 .

Gospavić, Radovan, Kreyenschmidt, Judith, Bruckner, Stefanie, Popov, Viktor, Haque, Nasimul, "Mathematical modelling for predicting the growth of Pseudomonas spp. in poultry under variable temperature conditions" in International Journal of Food Microbiology, 127 (2008):290-297,
https://doi.org/10.1016/j.ijfoodmicro.2008.07.022 . .

TY  - CONF
AU  - Gospavić, Radovan
AU  - Popov, Viktor
AU  - Todorović, Goran
PY  - 2007
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/151
AB  - Using the boundary element dual reciprocity method-multi domain (DRM-MD), bound electron states and the corresponding wave functions in semiconductor quantum wires embedded in a matrix were considered. The single circular and rectangular as well as the two near circular quantum wires were analysed. In the case of two coupled quantum wires, the dependence of the resulting wave function and eigenenergies as a function of the distance between wires was calculated. The DRM-MD gave a linear electron state model and the developed numerical approach accurately captured the symmetry breaking and splitting of the degenerated energy states due to the presence of additional wire. According to the symmetry of the structures a suitable mesh reduction was employed and different modes were considered separately. For a case of hetero structures, domain decomposition was used.
C3  - Boundary Elements and Other Mesh Reduction Methods Xxix
T1  - DRM-MD approach for bound electron states in semiconductor nano-wires
SP  - 121
VL  - 44
DO  - 10.2495/BE070121
ER  - 

@conference{
author = "Gospavić, Radovan and Popov, Viktor and Todorović, Goran",
year = "2007",
abstract = "Using the boundary element dual reciprocity method-multi domain (DRM-MD), bound electron states and the corresponding wave functions in semiconductor quantum wires embedded in a matrix were considered. The single circular and rectangular as well as the two near circular quantum wires were analysed. In the case of two coupled quantum wires, the dependence of the resulting wave function and eigenenergies as a function of the distance between wires was calculated. The DRM-MD gave a linear electron state model and the developed numerical approach accurately captured the symmetry breaking and splitting of the degenerated energy states due to the presence of additional wire. According to the symmetry of the structures a suitable mesh reduction was employed and different modes were considered separately. For a case of hetero structures, domain decomposition was used.",
journal = "Boundary Elements and Other Mesh Reduction Methods Xxix",
title = "DRM-MD approach for bound electron states in semiconductor nano-wires",
pages = "121",
volume = "44",
doi = "10.2495/BE070121"
}

Gospavić, R., Popov, V.,& Todorović, G.. (2007). DRM-MD approach for bound electron states in semiconductor nano-wires. in Boundary Elements and Other Mesh Reduction Methods Xxix, 44, 121.
https://doi.org/10.2495/BE070121

Gospavić R, Popov V, Todorović G. DRM-MD approach for bound electron states in semiconductor nano-wires. in Boundary Elements and Other Mesh Reduction Methods Xxix. 2007;44:121.
doi:10.2495/BE070121 .

Gospavić, Radovan, Popov, Viktor, Todorović, Goran, "DRM-MD approach for bound electron states in semiconductor nano-wires" in Boundary Elements and Other Mesh Reduction Methods Xxix, 44 (2007):121,
https://doi.org/10.2495/BE070121 . .

TY  - JOUR
AU  - Gospavić, Radovan
AU  - Popov, Viktor
AU  - Srecković, Milesa
AU  - Chen, C.S.
PY  - 2007
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3105
AB  - A dual reciprocity method multi-domain (DRM-MD) approach for modeling laser–material interaction with axial symmetry was developed. The proposed approach is based on the fundamental solution for the Laplace equation in 2D and is much simpler for implementation than the dual reciprocity boundary element method (DRBEM) based on the fundamental solution for axisymmetric problems incorporating elliptic integrals. The thermal model of laser–material interaction was applied for the cases of mono as well as
multi-layer structures. Different aspects of interaction up to the melting point of considered materials are presented. The effect of temperature dependence of the absorption coefficients on the process of laser heating was considered. Numerical results for spatial as well as temporal temperature distribution inside the material bulk are presented and compared to analytical solutions.
PB  - Elsevier
T2  - Engineering Analysis with Boundary Elements
T1  - DRM-MD approach for modeling laser–material interaction with axial symmetry
EP  - 208
SP  - 200
VL  - 31
DO  - 10.1016/j.enganabound.2006.09.006
ER  - 

@article{
author = "Gospavić, Radovan and Popov, Viktor and Srecković, Milesa and Chen, C.S.",
year = "2007",
abstract = "A dual reciprocity method multi-domain (DRM-MD) approach for modeling laser–material interaction with axial symmetry was developed. The proposed approach is based on the fundamental solution for the Laplace equation in 2D and is much simpler for implementation than the dual reciprocity boundary element method (DRBEM) based on the fundamental solution for axisymmetric problems incorporating elliptic integrals. The thermal model of laser–material interaction was applied for the cases of mono as well as
multi-layer structures. Different aspects of interaction up to the melting point of considered materials are presented. The effect of temperature dependence of the absorption coefficients on the process of laser heating was considered. Numerical results for spatial as well as temporal temperature distribution inside the material bulk are presented and compared to analytical solutions.",
publisher = "Elsevier",
journal = "Engineering Analysis with Boundary Elements",
title = "DRM-MD approach for modeling laser–material interaction with axial symmetry",
pages = "208-200",
volume = "31",
doi = "10.1016/j.enganabound.2006.09.006"
}

Gospavić, R., Popov, V., Srecković, M.,& Chen, C.S.. (2007). DRM-MD approach for modeling laser–material interaction with axial symmetry. in Engineering Analysis with Boundary Elements
Elsevier., 31, 200-208.
https://doi.org/10.1016/j.enganabound.2006.09.006

Gospavić R, Popov V, Srecković M, Chen C. DRM-MD approach for modeling laser–material interaction with axial symmetry. in Engineering Analysis with Boundary Elements. 2007;31:200-208.
doi:10.1016/j.enganabound.2006.09.006 .

Gospavić, Radovan, Popov, Viktor, Srecković, Milesa, Chen, C.S., "DRM-MD approach for modeling laser–material interaction with axial symmetry" in Engineering Analysis with Boundary Elements, 31 (2007):200-208,
https://doi.org/10.1016/j.enganabound.2006.09.006 . .

TY  - JOUR
AU  - Gospavić, Radovan
AU  - Srećković, Milesa
AU  - Popov, Viktor
AU  - Todorović, Goran
PY  - 2006
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/130
AB  - In this work an analytical approach for analyzing heating of material with a laser beam is presented. A thermal model of interaction for the case of cylindrical geometry of the material and asymmetric distribution of the laser beam intensity is used and an analytical procedure is developed to analyze the temporal and the spatial distribution of the temperature field inside the bulk of material. This kind of consideration is of practical interest in cases where the excitation by the laser beam is not symmetric in respect to its position or shape, e.g., multi-mode working regimes or asymmetrical distribution of the laser beam intensity. The heating effects were considered in the temperature range up to the melting point. The thermal and the optical parameters of the material were assumed to be independent of the temperature and were given constant values in the temperature range of interest. This approach makes use of the Laplace transform, in order to eliminate dependence on time. The Fourier method of variable separation was used to obtain the temperature field distribution in the Laplace transform domain. By using the pulse response and Duhamel's principle the 3D temperature field distribution in time domain is obtained. By using an appropriate set of orthogonal functions in r directions, the numerical procedure is made more effective, saving this way the CPU time. The general solutions for the temporal as well as spatial temperature field distributions are evaluated in a closed form in terms of the particular solutions of the governing partial differential equation (PDE). Because of linearity of the governing PDE, the superposition principle was used in the case of complex distributions of the laser beam intensity. The influence of different kinds of laser beam parameters to the temperature field distributions was considered.
PB  - Elsevier Ltd
T2  - Mathematical and Computer Modelling
T1  - 3D modeling of material heating with the laser beam for cylindrical geometry
EP  - 631
IS  - 5-6
SP  - 620
VL  - 43
DO  - 10.1016/j.mcm.2005.11.011
ER  - 

@article{
author = "Gospavić, Radovan and Srećković, Milesa and Popov, Viktor and Todorović, Goran",
year = "2006",
abstract = "In this work an analytical approach for analyzing heating of material with a laser beam is presented. A thermal model of interaction for the case of cylindrical geometry of the material and asymmetric distribution of the laser beam intensity is used and an analytical procedure is developed to analyze the temporal and the spatial distribution of the temperature field inside the bulk of material. This kind of consideration is of practical interest in cases where the excitation by the laser beam is not symmetric in respect to its position or shape, e.g., multi-mode working regimes or asymmetrical distribution of the laser beam intensity. The heating effects were considered in the temperature range up to the melting point. The thermal and the optical parameters of the material were assumed to be independent of the temperature and were given constant values in the temperature range of interest. This approach makes use of the Laplace transform, in order to eliminate dependence on time. The Fourier method of variable separation was used to obtain the temperature field distribution in the Laplace transform domain. By using the pulse response and Duhamel's principle the 3D temperature field distribution in time domain is obtained. By using an appropriate set of orthogonal functions in r directions, the numerical procedure is made more effective, saving this way the CPU time. The general solutions for the temporal as well as spatial temperature field distributions are evaluated in a closed form in terms of the particular solutions of the governing partial differential equation (PDE). Because of linearity of the governing PDE, the superposition principle was used in the case of complex distributions of the laser beam intensity. The influence of different kinds of laser beam parameters to the temperature field distributions was considered.",
publisher = "Elsevier Ltd",
journal = "Mathematical and Computer Modelling",
title = "3D modeling of material heating with the laser beam for cylindrical geometry",
pages = "631-620",
number = "5-6",
volume = "43",
doi = "10.1016/j.mcm.2005.11.011"
}

Gospavić, R., Srećković, M., Popov, V.,& Todorović, G.. (2006). 3D modeling of material heating with the laser beam for cylindrical geometry. in Mathematical and Computer Modelling
Elsevier Ltd., 43(5-6), 620-631.
https://doi.org/10.1016/j.mcm.2005.11.011

Gospavić R, Srećković M, Popov V, Todorović G. 3D modeling of material heating with the laser beam for cylindrical geometry. in Mathematical and Computer Modelling. 2006;43(5-6):620-631.
doi:10.1016/j.mcm.2005.11.011 .

Gospavić, Radovan, Srećković, Milesa, Popov, Viktor, Todorović, Goran, "3D modeling of material heating with the laser beam for cylindrical geometry" in Mathematical and Computer Modelling, 43, no. 5-6 (2006):620-631,
https://doi.org/10.1016/j.mcm.2005.11.011 . .

TY  - JOUR
AU  - Gospavić, Radovan
AU  - Popov, Viktor
AU  - Srećković, Milesa
AU  - Todorović, Goran
PY  - 2006
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3072
AB  - The modeling of laser-material interaction using the boundary element dual reciprocity method (BE-DRM) is presented. Thermal effects in the case of cylindrical geometry for mono as well as multi layer structures were considered. The different aspects of interaction up to the melting point of considered materials are presented. The effect of temperature dependence of the absorption coefficients on the process of laser heating was considered. The BEM formulation is based on the fundamental solution for the Laplace equation. The numerical results for spatial as well as temporal temperature distribution inside the material bulk are presented. Two cases were considered: a mono-layer and a multi layer case. In the case of a mono-layer structure DRM and DRM-MD approaches were used, and the numerical results were compared with the analytical ones. In the multi layer case only the DRM-MD approach was used.
T2  - WIT Transactions on modelling and simulation
T1  - DRM formulation for axisymmetric laser-material interactions
EP  - 88
SP  - 79
VL  - 42
DO  - 10.2495/BE06009
ER  - 

@article{
author = "Gospavić, Radovan and Popov, Viktor and Srećković, Milesa and Todorović, Goran",
year = "2006",
abstract = "The modeling of laser-material interaction using the boundary element dual reciprocity method (BE-DRM) is presented. Thermal effects in the case of cylindrical geometry for mono as well as multi layer structures were considered. The different aspects of interaction up to the melting point of considered materials are presented. The effect of temperature dependence of the absorption coefficients on the process of laser heating was considered. The BEM formulation is based on the fundamental solution for the Laplace equation. The numerical results for spatial as well as temporal temperature distribution inside the material bulk are presented. Two cases were considered: a mono-layer and a multi layer case. In the case of a mono-layer structure DRM and DRM-MD approaches were used, and the numerical results were compared with the analytical ones. In the multi layer case only the DRM-MD approach was used.",
journal = "WIT Transactions on modelling and simulation",
title = "DRM formulation for axisymmetric laser-material interactions",
pages = "88-79",
volume = "42",
doi = "10.2495/BE06009"
}

Gospavić, R., Popov, V., Srećković, M.,& Todorović, G.. (2006). DRM formulation for axisymmetric laser-material interactions. in WIT Transactions on modelling and simulation, 42, 79-88.
https://doi.org/10.2495/BE06009

Gospavić R, Popov V, Srećković M, Todorović G. DRM formulation for axisymmetric laser-material interactions. in WIT Transactions on modelling and simulation. 2006;42:79-88.
doi:10.2495/BE06009 .

Gospavić, Radovan, Popov, Viktor, Srećković, Milesa, Todorović, Goran, "DRM formulation for axisymmetric laser-material interactions" in WIT Transactions on modelling and simulation, 42 (2006):79-88,
https://doi.org/10.2495/BE06009 . .

TY  - JOUR
AU  - Gospavić, Radovan
AU  - Srećković, Milesa
AU  - Popov, Viktor
PY  - 2004
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/82
AB  - In this paper different aspects of laser-material interaction were considered. Semi-analytical method was developed and applied to analysis of spatial and temporal distribution of temperature field inside bulk materials. In particular, cases with cylindrical geometry, finite diameter and infinite length as well as cylindrical geometry, finite diameter and finite length were considered. For solving the governing partial differential equations (PDEs) the Laplace transform and the Fourier method of variables separation were used. In this way instead of the original governing PDEs, ordinary differential equations were solved. Particular solutions of the ordinary differential equations were used for evaluating the general solution, which was expressed in terms of series of particular solutions. The unknown coefficients in the series of particular solutions were determined using the boundary and initial conditions. The laser-material interaction was represented using the thermal model. These interactions for the cases of the high power laser in pulse and continuous regime were analysed. The incident intensity of laser radiation was under critical intensity. Using these methods the temperature field distribution was obtained in the Laplace transform domain. The convolution integral and the Green function were used to determine the temperature field in time domain. General semi-analytical methods and numerical solutions of appropriate transcendent equations were considered and numerical results for Al specimens were presented. The influences of laser beam parameters to the temperature field distribution and isothermal curves inside the bulk material were evaluated.
PB  - Elsevier
T2  - Mathematics and Computers in Simulation
T1  - Modelling of laser-material interaction using semi-analytical approach
EP  - 219
IS  - 3
SP  - 211
VL  - 65
DO  - 10.1016/j.matcom.2003.12.003
ER  - 

@article{
author = "Gospavić, Radovan and Srećković, Milesa and Popov, Viktor",
year = "2004",
abstract = "In this paper different aspects of laser-material interaction were considered. Semi-analytical method was developed and applied to analysis of spatial and temporal distribution of temperature field inside bulk materials. In particular, cases with cylindrical geometry, finite diameter and infinite length as well as cylindrical geometry, finite diameter and finite length were considered. For solving the governing partial differential equations (PDEs) the Laplace transform and the Fourier method of variables separation were used. In this way instead of the original governing PDEs, ordinary differential equations were solved. Particular solutions of the ordinary differential equations were used for evaluating the general solution, which was expressed in terms of series of particular solutions. The unknown coefficients in the series of particular solutions were determined using the boundary and initial conditions. The laser-material interaction was represented using the thermal model. These interactions for the cases of the high power laser in pulse and continuous regime were analysed. The incident intensity of laser radiation was under critical intensity. Using these methods the temperature field distribution was obtained in the Laplace transform domain. The convolution integral and the Green function were used to determine the temperature field in time domain. General semi-analytical methods and numerical solutions of appropriate transcendent equations were considered and numerical results for Al specimens were presented. The influences of laser beam parameters to the temperature field distribution and isothermal curves inside the bulk material were evaluated.",
publisher = "Elsevier",
journal = "Mathematics and Computers in Simulation",
title = "Modelling of laser-material interaction using semi-analytical approach",
pages = "219-211",
number = "3",
volume = "65",
doi = "10.1016/j.matcom.2003.12.003"
}

Gospavić, R., Srećković, M.,& Popov, V.. (2004). Modelling of laser-material interaction using semi-analytical approach. in Mathematics and Computers in Simulation
Elsevier., 65(3), 211-219.
https://doi.org/10.1016/j.matcom.2003.12.003

Gospavić R, Srećković M, Popov V. Modelling of laser-material interaction using semi-analytical approach. in Mathematics and Computers in Simulation. 2004;65(3):211-219.
doi:10.1016/j.matcom.2003.12.003 .

Gospavić, Radovan, Srećković, Milesa, Popov, Viktor, "Modelling of laser-material interaction using semi-analytical approach" in Mathematics and Computers in Simulation, 65, no. 3 (2004):211-219,
https://doi.org/10.1016/j.matcom.2003.12.003 . .