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milan martinov

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Danilo Andjelkovic

University of Novi Sad

Dejan Pljevljakusic

University of Novi Sad, Faculty of Technical Sciences

Andreja Jakovljevic

University of Belgrade, Faculty of Mechanical Engineering

Institute of Field and Vegetable Crops

Prof. dr Zeljko Despotovic

University of Belgrade

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Papers by milan martinov

Mogućnost primene virtualnog rotirajućeg češlja kod mehanizovanog ubiranja cvasti nevena (Calendula officinalis L.)

The objective of the investigation was to examine possibility of mechanized harvesting of marigol... more The objective of the investigation was to examine possibility of mechanized harvesting of marigold inflorescences by applying a virtual rotating comb type chamomile harvester. The impact of coefficient R, relation between the working device penetration into the inflorescences horizon and the average value of highest and lowest inflorescences span-width of inflorescences band, on harvest yield, was tested. It was found that for coefficient R value 1.3, in average 90 % of the inflorescences’ yield can be harvested. Future investigation should be directed towards solving the mechanical separation of the inflorescences from the harvested mass and process of shortening the inflorescences’ stems and determination of economic viability of mechanized harvest with proposed procedure.Cilj istraživanja bio je da se ispita mogućnost mehanizovanog branja cvasti primenom radnog organa tipa virtualnog rotirajućeg češlja, koji se koristi za ubiranje kamilice. Ispitan je uticaj koeficijenta R, koji ...

Ocena emisije gasova s efektom staklene bašte lanca snabdevanja kukuruzovine

Within this investigation, different scenarios for supply chains of corn stover intended for biog... more Within this investigation, different scenarios for supply chains of corn stover intended for biogas production were evaluated in terms of emissions of the greenhouse gasses and their impact to global warming. A primary difference between the scenarios was due to application of different stover collection techniques i.e. forage harvester, baling of big rectangular and round bales. It was found that the supply chain, which includes the application of forage harvester for stover collection is characterized by the highest value of impact, approximately 70 and 85 kg CO2 eq MgDM–1, respectively for the usual and reduced corn stover yield. For the supply chain which includes baling of big rectangular bales, these values are around 62 and 68 kg CO2 eq MgDM–1, and for the baling of round bales, values are 61 and 67 kg CO2 eq MgDM–1. Among the analyzed greenhouse gases emissions, the dominant impact is due to the emissions of carbon dioxide. The reduction of the corn stover yield, caused by e...

Potencijal žetvenih ostataka uljane repice u Srbiji

Rapeseed straw is potential source of renewable energy, but important source of soil organic matt... more Rapeseed straw is potential source of renewable energy, but important source of soil organic matter as well. The amount of crop residues, available for energy use, per hectare, is not well known. Excessive offtake of crop residues can be followed by reduction of soil fertility, removal of nutrients, organic carbon and wind erosion. The objective of the investigation was to define total and harvestable amount of crop residues – straw, and amount that remain on the field, which can be background for the calculation of soil fertility preservation. In 2013 (climatic conditions characterized as moderate dry) samples of aboveground mass of eight varieties were collected from three locations, and in 2014 (characterized as moderate to extreme humid) six varieties for one location. The samples were divided into: grain, stalks and hulls. It has been defined yield of fractions and calculated harvest index. The stalks were split along their lengths, parts measured and created cumulative mass di...

Zamena Mineralnih Hraniva Ostatkom Fermentacije

Zbornik radova Fakulteta tehničkih nauka u Novom Sadu

U ovom radu je prikazana ušteda u energetskom inputu, proizvodnje i raspodele mineralnih hraniva,... more

Influence of Legislation/Subsidies, to Help Agriculture and/or Agricultural Mechanisation, on the Market of Agricultural Machinery: The case of South East-Europe

Authors: • PhD Selim Skaljic (Faculty of Agriculture, Univ. of Sarajevo, Bosnia and Herzegovina) ... more Authors: • PhD Selim Skaljic (Faculty of Agriculture, Univ. of Sarajevo, Bosnia and Herzegovina) • Prof. Nikolay Mihailov (Fac. of Electrical & Electronic Eng., Univ. of Rousse, Bulgaria) • Prof. Silvio Kosutic (Faculty of Agriculture, University of Zagreb, Croatia) • Prof. Victor Ros (Faculty of Mechanics, Technical University of Cluj-Napoca, Romania) • Prof. Milan Martinov (Faculty of Mechanical Engineering, University of Novi Sad, Serbia) • Prof. Okyay Kamil Sindir (Faculty of Agriculture, Egee University, Turkey)

An application of different drying methods on the color and rehydration ability of dried Asparagus maritimus L. samples

Fresh asparagus is gaining popularity due to its unique texture and flavor but they are also an e... more Fresh asparagus is gaining popularity due to its unique texture and flavor but they are also an extremely perishable vegetable. Because of that the aim of this research was to dry those vegetable to provides long term conservation and marketability. Wild asparagus that have been grown in area of the Adriatic Sea were dried in tray drier at different drying temperatures 50° C, 60° C and 70° C and in freeze-dried equipement at – 40° C and then rehydrated. The color of dried material and rehydration ratio are selected as the main quality characteristics of wild asparagus. The best rehydration ratio were achieved when samples were freeze dried at – 40° C. Based on color and rehydration ratio convective drying at 60° C presents an optimum. The rehydration and appearance of dried asparagus are two important physical factors that need special attention when designing or selecting a drying procedure.

Emissionen bei der Verbrennung von Gärresten aus Biogasanlagen

Landtechnik, 2009

Der steigende Anfall an Garresten aus Biogasanlagen erfordert neue wirtschaftlich und technisch s... more Der steigende Anfall an Garresten aus Biogasanlagen erfordert neue wirtschaftlich und technisch sinnvolle Verwertungsmoglichkeiten. Neben der Nutzung als Dunger stellt vor allem die energetische Verwertung eine vielversprechende Alternative dar. Erste Verbrennungsversuche bescheinigen die generelle Eignung von Garreste-Pellets als Brennstoff. Die Rauchgasemissionen unterschritten die gesetzlich festgelegten Grenzwerte. Die Zusammensetzung der Feuerraumasche lasst nach erster Einschatzung eine Nutzung als Dunger zu.

Investigation of mechanised marigold flowers harvesting

Corn stover as a feedstock for production of advanced biofuels

Obligation for biofuels production is clearly defined by the legislation of EU. Using of non food... more Obligation for biofuels production is clearly defined by the legislation of EU. Using of non food / non feed feedstock has priority and can be eligible for subsidies if defined reduction of greenhouse gases –GHG, at least 60 % after 2018, was obtained and documented. In Danube downstream countries corn is prevailing field crop. The objective was to define possibility of corn stover use as a feedstock for production of lignocellulosic bioethanol –LCB and biomethane. Calculation of potentials and GHG emissions for feedstock procurement was performed. During the harvest period, full grain maturity, and years 2011, 2012 and 2014, samples of hybrids were collected at three locations in the province Vojvodina. The average theoretical potentials were 10.4, 5.3 and 12.4 Mg/ha. Technical potentials for analyzed collection technique were 9.2, 6.3 and 8.4 Mg/ha with characteristic relative yield (related to grain yield) ranging between approximately 60 and 80 %. These data can be used, after g...

Potentials of Rapeseed Crop Residues in Serbia

Greenhouse gas emission savings of electricity generated from biogas produced from corn stover

Biomass Conversion and Biorefinery, 2021

EU-Directive 2018/2001 defines the method for determining greenhouse gas (GHG) emission savings a... more EU-Directive 2018/2001 defines the method for determining greenhouse gas (GHG) emission savings and respective sustainability criterion. GHG emission savings are calculated inadequately for two reasons in the case of energy utilization of biogas produced from crop residues. First is that the allocation of emissions to biogas and digestate is not precisely defined. The second one is the rule not to account for GHG emissions before the collection of crop residues. The objective of this study was to determine values of GHG emission savings of electricity generated from biogas produced from corn stover. Determination was done by strictly applying the method defined by the directive and its associated rules and defining cases where identified shortcomings of the method are overcome. Shortcomings are overcome by system boundary expansion and incorporation of associated GHG emissions for new material flows. GHG emission savings for all defined cases were lower than 70% which is a minimum value for sustainability in terms of GHG emissions savings. Since all results of GHG emission savings for analyzed cases were under the limit of 70%, it is concluded that by expanding the system boundaries of analysis, GHG emissions are realistically calculated, but the decision about sustainability in terms of GHG emission savings is not changed.

Profitability of corn cob utilization as a fuel in small residential heating appliances

Thermal Science, 2020

The subject of this paper is utilization of corn cobs as a fuel in small residential heating appl... more The subject of this paper is utilization of corn cobs as a fuel in small residential heating appliances in Serbia. The objective was to investigate the profitability of the three cob forms: whole, crushed and pellets. Thereby, construction and reconstruction option of a heating system that uses corn cobs were compared with woody and fossil fuel forms. Net present values (NPV) of generated costs in the first option, as well as NPV of savings, payback period (PBP) and internal rate or return (IRR) in the second, were analyzed. Assessment was conducted using BiomasaPro calculator with integrated approach for energy facility investments. Only utilization of whole cobs were profitable, comparing with wood logs, coal and natural gas. In option construction, around 8,700, 7,000 and more than 4,100 ? could be thus saved after the appliance lifespan, respectively. The savings could be 7,800, 5,500 and more than 3,600 ? in option reconstruction, with PBP less than two years compared with wood...

Potentials of crops residues – A case study for the province Vojvodina

Die Bodenkultur: Journal of Land Management, Food and Environment, 2019

Summary Crop residues are targeted as energy sources and feedstock for diverse products. A six-ye... more Summary Crop residues are targeted as energy sources and feedstock for diverse products. A six-year lasting investigation, aiming to determine the yield potentials of crop residues of mostly grown field crops wheat, soybean and corn in the province Vojvodina (Serbia), was performed. The three levels of potentials were distinguished: theoretical, technical and sustainable. Two seasonal weather conditions were distinguished – common and dry, and their impact on the biomass yield was analyzed. The yields were expressed as absolute and relative to grain yield since the grain yield is always measured, and is available in national statistics. During common seasons, technical potentials were about 56% for wheat, 45% for soybean and 41 or 51% for the two considered corn stover collection procedures. For dry seasons, the technical potential of all considered crops was reduced to between 30 and 50%. On field remained aboveground residual biomass and its relative (to grain) amount, which was b...

Influence of drying procedure on colour and rehydration characteristic of wild asparagus

Czech Journal of Food Sciences, 2009

The objective of this research was to examine the influence of different drying procedures on the... more The objective of this research was to examine the influence of different drying procedures on the colour quality and rehydration capacity of wild asparagus (Asparagus maritimus L.). Wild asparagus samples were dried using convective (40°C, 50°C, 60°C, and 70°C at the airflow velocity of 2.75 m/s), natural, and freeze (–20°C and –40°C) drying procedures. Rehydration and colour characteristics were used as indicators of the quality of the dried asparagus samples. Convective drying of asparagus resulted in the smallest colour change of the fresh material, whereby drying at 60°C presented the optimum. The best rehydration ratio was achieved when the samples were freeze dried at –40°C. Naturally dried asparagus samples resulted in a very low rehydration ratio compared to the other procedures investigated. The rehydration and appearance of the dried asparagus are two important physical factors that need special attention when designing or selecting a drying procedure. Furthermore, the inf...

Flow characteristics of sage and peppermint leaves

International Journal of Multiphase Flow, 1997

The plane problem of steady two-phase flow ofa multicomponent mixture through a porous medium wit... more The plane problem of steady two-phase flow ofa multicomponent mixture through a porous medium with phase transitions is considered. It is shown that the system of equations for the two-phase multieomponent flow process, together with the equations of phase equilibrium, can be solved in quadratures if the solution of two auxiliary problems is known. These are the problem ofconformal mapping of the neighborhood of a well onto a rectangle and the purely physicochemical problem of the description of the mechanical and thermodynamic properties of a mixture. The solutions for a vertical well with a barrier and for a horizontal well in a finite pproductive stratum are found under certain assumptions concerning the properties of the mixture.

Impact of drying air temperature on course of drying and quality of

ABSTRACT

Matematički model procesa zagrevanja agensa za sušenje lekovitog bilja

http://scindeks.ceon.rs/article.aspx?query=ARTAU%26and%26gobor&page=5&sort=1&stype=0&backurl=%2fS... more

Detection of Root Biomass using Ultra Wideband Radar - an Approach to Potato Nest Positioning

In this paper are presented the most important principles of data acquisition and processing for ... more In this paper are presented the most important principles of data acquisition and processing for detection of biomass using high resolution ultra-wideband (UWB) M-Sequence-Radar. The similarities and differences of sugar beet detection and potato detection are particularly emphasized. The problem and the objective of the detection of the potato nest's bottom are described. Results of the analysis of backscattered signals from the potato ridge and transmitted signals through the potato ridge are given. The radar features and geometrical influences of the scenario are considered and discussed. The principle of potato detection in the driving direction and the preliminary results under laboratory conditions are analyzed and illustrated. At the end the possibilities to develop the method are discussed.

The role of agricultural engineers in sustainable rural development in SEE (South Eastern Europe) countries

Journal of Agricultural Sciences, Belgrade, 2008

Rural areas, especially in developing countries, are facing with numerous social, economical, cul... more Rural areas, especially in developing countries, are facing with numerous social, economical, cultural and environmental problems. In the most cases there is a growing concern because only very few farmers or inhabitants are able to follow contemporary, sustainable and environment-friendly methods in farming systems. The consequences of this are numerous, such as: poverty, significant migration to urban areas and unplanned suburban settlements. This has a significant impact on the national economy, demography, and environment. The Association of Agricultural Engineering in South Eastern Europe (AESEE), recently have dealt with these significant problems of the rural communities of their region and herewith emphasized the role of agricultural engineers in overcoming the problems and providing applicable solutions for a sustainable rural development.

Analysis of opportunities for new biomass CHP plants in Vojvodina

Vojvodina is the region in Serbia with a lot of biomass resources mostly coming from agricultural... more Vojvodina is the region in Serbia with a lot of biomass resources mostly coming from agricultural sources. In order to explore the possibilities to use these resources, the research was made on the opportunities to use biomass CHP plants in three main scenarios based on characteristics of heat demand and electricity generation. Since there is not enough available data on typical industrial needs which would be generally applicable in Vojvodina, in all three scenarios, the heat demand was taken into account only according to possibilities of the usage of hot water in district heating systems. The presumption was that the temperature of the steam extraction used for heating purposes should be 120°C. For this reason, in the following research the CHP plant which was examined was a cogeneration power plant which has the steam turbine with one controlled extraction and the condenser for the purpose of maximising the production of electricity when it is possible. Steam parameters at the i...

Mogućnost primene virtualnog rotirajućeg češlja kod mehanizovanog ubiranja cvasti nevena (Calendula officinalis L.)

The objective of the investigation was to examine possibility of mechanized harvesting of marigol... more The objective of the investigation was to examine possibility of mechanized harvesting of marigold inflorescences by applying a virtual rotating comb type chamomile harvester. The impact of coefficient R, relation between the working device penetration into the inflorescences horizon and the average value of highest and lowest inflorescences span-width of inflorescences band, on harvest yield, was tested. It was found that for coefficient R value 1.3, in average 90 % of the inflorescences’ yield can be harvested. Future investigation should be directed towards solving the mechanical separation of the inflorescences from the harvested mass and process of shortening the inflorescences’ stems and determination of economic viability of mechanized harvest with proposed procedure.Cilj istraživanja bio je da se ispita mogućnost mehanizovanog branja cvasti primenom radnog organa tipa virtualnog rotirajućeg češlja, koji se koristi za ubiranje kamilice. Ispitan je uticaj koeficijenta R, koji ...

Ocena emisije gasova s efektom staklene bašte lanca snabdevanja kukuruzovine

Within this investigation, different scenarios for supply chains of corn stover intended for biog... more Within this investigation, different scenarios for supply chains of corn stover intended for biogas production were evaluated in terms of emissions of the greenhouse gasses and their impact to global warming. A primary difference between the scenarios was due to application of different stover collection techniques i.e. forage harvester, baling of big rectangular and round bales. It was found that the supply chain, which includes the application of forage harvester for stover collection is characterized by the highest value of impact, approximately 70 and 85 kg CO2 eq MgDM–1, respectively for the usual and reduced corn stover yield. For the supply chain which includes baling of big rectangular bales, these values are around 62 and 68 kg CO2 eq MgDM–1, and for the baling of round bales, values are 61 and 67 kg CO2 eq MgDM–1. Among the analyzed greenhouse gases emissions, the dominant impact is due to the emissions of carbon dioxide. The reduction of the corn stover yield, caused by e...

Potencijal žetvenih ostataka uljane repice u Srbiji

Rapeseed straw is potential source of renewable energy, but important source of soil organic matt... more Rapeseed straw is potential source of renewable energy, but important source of soil organic matter as well. The amount of crop residues, available for energy use, per hectare, is not well known. Excessive offtake of crop residues can be followed by reduction of soil fertility, removal of nutrients, organic carbon and wind erosion. The objective of the investigation was to define total and harvestable amount of crop residues – straw, and amount that remain on the field, which can be background for the calculation of soil fertility preservation. In 2013 (climatic conditions characterized as moderate dry) samples of aboveground mass of eight varieties were collected from three locations, and in 2014 (characterized as moderate to extreme humid) six varieties for one location. The samples were divided into: grain, stalks and hulls. It has been defined yield of fractions and calculated harvest index. The stalks were split along their lengths, parts measured and created cumulative mass di...

Zamena Mineralnih Hraniva Ostatkom Fermentacije

Zbornik radova Fakulteta tehničkih nauka u Novom Sadu

U ovom radu je prikazana ušteda u energetskom inputu, proizvodnje i raspodele mineralnih hraniva,... more

Influence of Legislation/Subsidies, to Help Agriculture and/or Agricultural Mechanisation, on the Market of Agricultural Machinery: The case of South East-Europe

Authors: • PhD Selim Skaljic (Faculty of Agriculture, Univ. of Sarajevo, Bosnia and Herzegovina) ... more Authors: • PhD Selim Skaljic (Faculty of Agriculture, Univ. of Sarajevo, Bosnia and Herzegovina) • Prof. Nikolay Mihailov (Fac. of Electrical & Electronic Eng., Univ. of Rousse, Bulgaria) • Prof. Silvio Kosutic (Faculty of Agriculture, University of Zagreb, Croatia) • Prof. Victor Ros (Faculty of Mechanics, Technical University of Cluj-Napoca, Romania) • Prof. Milan Martinov (Faculty of Mechanical Engineering, University of Novi Sad, Serbia) • Prof. Okyay Kamil Sindir (Faculty of Agriculture, Egee University, Turkey)

An application of different drying methods on the color and rehydration ability of dried Asparagus maritimus L. samples

Fresh asparagus is gaining popularity due to its unique texture and flavor but they are also an e... more Fresh asparagus is gaining popularity due to its unique texture and flavor but they are also an extremely perishable vegetable. Because of that the aim of this research was to dry those vegetable to provides long term conservation and marketability. Wild asparagus that have been grown in area of the Adriatic Sea were dried in tray drier at different drying temperatures 50° C, 60° C and 70° C and in freeze-dried equipement at – 40° C and then rehydrated. The color of dried material and rehydration ratio are selected as the main quality characteristics of wild asparagus. The best rehydration ratio were achieved when samples were freeze dried at – 40° C. Based on color and rehydration ratio convective drying at 60° C presents an optimum. The rehydration and appearance of dried asparagus are two important physical factors that need special attention when designing or selecting a drying procedure.

Emissionen bei der Verbrennung von Gärresten aus Biogasanlagen

Landtechnik, 2009

Der steigende Anfall an Garresten aus Biogasanlagen erfordert neue wirtschaftlich und technisch s... more Der steigende Anfall an Garresten aus Biogasanlagen erfordert neue wirtschaftlich und technisch sinnvolle Verwertungsmoglichkeiten. Neben der Nutzung als Dunger stellt vor allem die energetische Verwertung eine vielversprechende Alternative dar. Erste Verbrennungsversuche bescheinigen die generelle Eignung von Garreste-Pellets als Brennstoff. Die Rauchgasemissionen unterschritten die gesetzlich festgelegten Grenzwerte. Die Zusammensetzung der Feuerraumasche lasst nach erster Einschatzung eine Nutzung als Dunger zu.

Investigation of mechanised marigold flowers harvesting

Corn stover as a feedstock for production of advanced biofuels

Obligation for biofuels production is clearly defined by the legislation of EU. Using of non food... more Obligation for biofuels production is clearly defined by the legislation of EU. Using of non food / non feed feedstock has priority and can be eligible for subsidies if defined reduction of greenhouse gases –GHG, at least 60 % after 2018, was obtained and documented. In Danube downstream countries corn is prevailing field crop. The objective was to define possibility of corn stover use as a feedstock for production of lignocellulosic bioethanol –LCB and biomethane. Calculation of potentials and GHG emissions for feedstock procurement was performed. During the harvest period, full grain maturity, and years 2011, 2012 and 2014, samples of hybrids were collected at three locations in the province Vojvodina. The average theoretical potentials were 10.4, 5.3 and 12.4 Mg/ha. Technical potentials for analyzed collection technique were 9.2, 6.3 and 8.4 Mg/ha with characteristic relative yield (related to grain yield) ranging between approximately 60 and 80 %. These data can be used, after g...

Potentials of Rapeseed Crop Residues in Serbia

Greenhouse gas emission savings of electricity generated from biogas produced from corn stover

Biomass Conversion and Biorefinery, 2021

EU-Directive 2018/2001 defines the method for determining greenhouse gas (GHG) emission savings a... more EU-Directive 2018/2001 defines the method for determining greenhouse gas (GHG) emission savings and respective sustainability criterion. GHG emission savings are calculated inadequately for two reasons in the case of energy utilization of biogas produced from crop residues. First is that the allocation of emissions to biogas and digestate is not precisely defined. The second one is the rule not to account for GHG emissions before the collection of crop residues. The objective of this study was to determine values of GHG emission savings of electricity generated from biogas produced from corn stover. Determination was done by strictly applying the method defined by the directive and its associated rules and defining cases where identified shortcomings of the method are overcome. Shortcomings are overcome by system boundary expansion and incorporation of associated GHG emissions for new material flows. GHG emission savings for all defined cases were lower than 70% which is a minimum value for sustainability in terms of GHG emissions savings. Since all results of GHG emission savings for analyzed cases were under the limit of 70%, it is concluded that by expanding the system boundaries of analysis, GHG emissions are realistically calculated, but the decision about sustainability in terms of GHG emission savings is not changed.

Profitability of corn cob utilization as a fuel in small residential heating appliances

Thermal Science, 2020

The subject of this paper is utilization of corn cobs as a fuel in small residential heating appl... more The subject of this paper is utilization of corn cobs as a fuel in small residential heating appliances in Serbia. The objective was to investigate the profitability of the three cob forms: whole, crushed and pellets. Thereby, construction and reconstruction option of a heating system that uses corn cobs were compared with woody and fossil fuel forms. Net present values (NPV) of generated costs in the first option, as well as NPV of savings, payback period (PBP) and internal rate or return (IRR) in the second, were analyzed. Assessment was conducted using BiomasaPro calculator with integrated approach for energy facility investments. Only utilization of whole cobs were profitable, comparing with wood logs, coal and natural gas. In option construction, around 8,700, 7,000 and more than 4,100 ? could be thus saved after the appliance lifespan, respectively. The savings could be 7,800, 5,500 and more than 3,600 ? in option reconstruction, with PBP less than two years compared with wood...

Potentials of crops residues – A case study for the province Vojvodina

Die Bodenkultur: Journal of Land Management, Food and Environment, 2019

Summary Crop residues are targeted as energy sources and feedstock for diverse products. A six-ye... more Summary Crop residues are targeted as energy sources and feedstock for diverse products. A six-year lasting investigation, aiming to determine the yield potentials of crop residues of mostly grown field crops wheat, soybean and corn in the province Vojvodina (Serbia), was performed. The three levels of potentials were distinguished: theoretical, technical and sustainable. Two seasonal weather conditions were distinguished – common and dry, and their impact on the biomass yield was analyzed. The yields were expressed as absolute and relative to grain yield since the grain yield is always measured, and is available in national statistics. During common seasons, technical potentials were about 56% for wheat, 45% for soybean and 41 or 51% for the two considered corn stover collection procedures. For dry seasons, the technical potential of all considered crops was reduced to between 30 and 50%. On field remained aboveground residual biomass and its relative (to grain) amount, which was b...

Influence of drying procedure on colour and rehydration characteristic of wild asparagus

Czech Journal of Food Sciences, 2009

The objective of this research was to examine the influence of different drying procedures on the... more The objective of this research was to examine the influence of different drying procedures on the colour quality and rehydration capacity of wild asparagus (Asparagus maritimus L.). Wild asparagus samples were dried using convective (40°C, 50°C, 60°C, and 70°C at the airflow velocity of 2.75 m/s), natural, and freeze (–20°C and –40°C) drying procedures. Rehydration and colour characteristics were used as indicators of the quality of the dried asparagus samples. Convective drying of asparagus resulted in the smallest colour change of the fresh material, whereby drying at 60°C presented the optimum. The best rehydration ratio was achieved when the samples were freeze dried at –40°C. Naturally dried asparagus samples resulted in a very low rehydration ratio compared to the other procedures investigated. The rehydration and appearance of the dried asparagus are two important physical factors that need special attention when designing or selecting a drying procedure. Furthermore, the inf...

Flow characteristics of sage and peppermint leaves

International Journal of Multiphase Flow, 1997

The plane problem of steady two-phase flow ofa multicomponent mixture through a porous medium wit... more The plane problem of steady two-phase flow ofa multicomponent mixture through a porous medium with phase transitions is considered. It is shown that the system of equations for the two-phase multieomponent flow process, together with the equations of phase equilibrium, can be solved in quadratures if the solution of two auxiliary problems is known. These are the problem ofconformal mapping of the neighborhood of a well onto a rectangle and the purely physicochemical problem of the description of the mechanical and thermodynamic properties of a mixture. The solutions for a vertical well with a barrier and for a horizontal well in a finite pproductive stratum are found under certain assumptions concerning the properties of the mixture.

Impact of drying air temperature on course of drying and quality of

ABSTRACT

Matematički model procesa zagrevanja agensa za sušenje lekovitog bilja

http://scindeks.ceon.rs/article.aspx?query=ARTAU%26and%26gobor&page=5&sort=1&stype=0&backurl=%2fS... more

Detection of Root Biomass using Ultra Wideband Radar - an Approach to Potato Nest Positioning

In this paper are presented the most important principles of data acquisition and processing for ... more In this paper are presented the most important principles of data acquisition and processing for detection of biomass using high resolution ultra-wideband (UWB) M-Sequence-Radar. The similarities and differences of sugar beet detection and potato detection are particularly emphasized. The problem and the objective of the detection of the potato nest's bottom are described. Results of the analysis of backscattered signals from the potato ridge and transmitted signals through the potato ridge are given. The radar features and geometrical influences of the scenario are considered and discussed. The principle of potato detection in the driving direction and the preliminary results under laboratory conditions are analyzed and illustrated. At the end the possibilities to develop the method are discussed.

The role of agricultural engineers in sustainable rural development in SEE (South Eastern Europe) countries

Journal of Agricultural Sciences, Belgrade, 2008

Rural areas, especially in developing countries, are facing with numerous social, economical, cul... more Rural areas, especially in developing countries, are facing with numerous social, economical, cultural and environmental problems. In the most cases there is a growing concern because only very few farmers or inhabitants are able to follow contemporary, sustainable and environment-friendly methods in farming systems. The consequences of this are numerous, such as: poverty, significant migration to urban areas and unplanned suburban settlements. This has a significant impact on the national economy, demography, and environment. The Association of Agricultural Engineering in South Eastern Europe (AESEE), recently have dealt with these significant problems of the rural communities of their region and herewith emphasized the role of agricultural engineers in overcoming the problems and providing applicable solutions for a sustainable rural development.

Analysis of opportunities for new biomass CHP plants in Vojvodina

Vojvodina is the region in Serbia with a lot of biomass resources mostly coming from agricultural... more Vojvodina is the region in Serbia with a lot of biomass resources mostly coming from agricultural sources. In order to explore the possibilities to use these resources, the research was made on the opportunities to use biomass CHP plants in three main scenarios based on characteristics of heat demand and electricity generation. Since there is not enough available data on typical industrial needs which would be generally applicable in Vojvodina, in all three scenarios, the heat demand was taken into account only according to possibilities of the usage of hot water in district heating systems. The presumption was that the temperature of the steam extraction used for heating purposes should be 120°C. For this reason, in the following research the CHP plant which was examined was a cogeneration power plant which has the steam turbine with one controlled extraction and the condenser for the purpose of maximising the production of electricity when it is possible. Steam parameters at the i...