Bojana Zivanovic - Academia.edu (original) (raw)
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Papers by Bojana Zivanovic
2010 IEEE 11th Annual Wireless and Microwave Technology Conference (WAMICON), 2010
ABSTRACT
TURKISH JOURNAL OF AGRICULTURE AND FORESTRY, 2017
Tomato (Solanum lycopersicum L.) is among the economically most important vegetables in Europe, v... more Tomato (Solanum lycopersicum L.) is among the economically most important vegetables in Europe, valued for its bioactive properties due to significant contents of vitamins, carotenoids, and phenolic compounds. In this study, the tomato cultivar Big Beef F1 was grown in the open field (OF) and under polytunnels in central Serbia during 3 years. Polytunnels were covered with two foils (both with 57% reduced photosynthetic active radiation, PAR) differing in UV-A and UV-B transmittance. The aim of our work was to determine the influence of light conditions on accumulation of phytonutrients (carotenoids and phenolics) in the peel and flesh of ripe tomato fruits. The amount of effective antioxidants, caffeic acid, and quercetin (phenolics with ortho-dihydroxy substitution) in the peel was the highest in tomato fruits grown in the OF (maximal PAR and UV-A and UV-B radiation). Moreover, the content of leaf epidermal flavonoids was the highest in the OF. The content of lycopene and β-carotene in the flesh of tomato fruit was higher under the polytunnel with higher UV-transmittance. Our results showed that selection of the right light conditions (quality and intensity) for tomato production has a significant effect on the accumulation of beneficial phenolics and carotenoids.
MRS Proceedings, 2004
ABSTRACTCarbon nanotubes have shown promising properties for applications in electronic circuits ... more ABSTRACTCarbon nanotubes have shown promising properties for applications in electronic circuits and other device structures. Several device structures have been demonstrated in recent years by manual manipulation of single nanotubes. The integration of large numbers of nanotubes on wafer size substrates, however, has been a challenge.Our approach addressing this issue utilizes nano-patterning methods in combination with plasma enhanced chemical vapor deposition to directly assemble carbon nanotubes on wafer structures. A secondary formation step is used to actually form device structures connecting the nanotubes to electrode structures. We present first results demonstrating the feasibility of our approach. Electrode structures were prepared using multi-step electron beam lithography processes. Carbon nanotubes were grown in pre-defined locations, and contact formation procedures were carried out to establish multi-terminal contact structures.
2008 IEEE Antennas and Propagation Society International Symposium, 2008
This paper details a compact, reconfigurable channel emulator (CRCE) specifically designed to cre... more This paper details a compact, reconfigurable channel emulator (CRCE) specifically designed to create severe, multipath fading channels. The CRCE is a chamber that, unlike anechoic or reverberation chambers, provides non-uniform fading profiles for wireless devices placed within. In particular, the contribution of this work is that the CRCE is capable of creating not only Ricean and Rayleigh fading profiles, but
2006 IEEE Annual Wireless and Microwave Technology Conference, 2006
Recently, measured channel responses for wireless links in airframes, busses and helicopter envir... more Recently, measured channel responses for wireless links in airframes, busses and helicopter environments have demonstrated that frequency-selective fading can be more severe than predicted by the Rayleigh channel model. The work herein investigates simple diversity methods as a means to mitigate such fading which is referred to as exhibiting hyper-Rayleigh behavior. In particular, the work presents the gains achieved by
2007 IEEE Antennas and Propagation International Symposium, 2007
ABSTRACT
Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation, 2012
ABSTRACT A C-band, six-element slot-coupled microstrip antenna array is presented. The array arch... more ABSTRACT A C-band, six-element slot-coupled microstrip antenna array is presented. The array architecture employs a dual series feeding mechanism, where opposite ends of the array are fed with equal but anti-phase signals in order to maintain a broadside pattern over frequency. This approach facilitates the use of the 6-element panel in high gain, omni-directional arrays for airborne applications that require frequency-hopping capability. The elevation pattern stability is shown from 4.5 GHz to 5.5 GHz and the measured gain of the array is 12.6 dB.
IEEE Transactions on Antennas and Propagation, 2012
ABSTRACT
IEEE Microwave Magazine, 2009
When people talk about which universities have the strongest microwave program, will they mention... more When people talk about which universities have the strongest microwave program, will they mention your school? The typical route that students get involved with IEEE activities is by joining an IEEE Student Branch through their university; there are over 1,400 Student Branches worldwide. IEEE Student Members can then join MTT-S to receive Society periodicals and get discounts at MTT-S conferences.
2010 IEEE 11th Annual Wireless and Microwave Technology Conference (WAMICON), 2010
ABSTRACT
TURKISH JOURNAL OF AGRICULTURE AND FORESTRY, 2017
Tomato (Solanum lycopersicum L.) is among the economically most important vegetables in Europe, v... more Tomato (Solanum lycopersicum L.) is among the economically most important vegetables in Europe, valued for its bioactive properties due to significant contents of vitamins, carotenoids, and phenolic compounds. In this study, the tomato cultivar Big Beef F1 was grown in the open field (OF) and under polytunnels in central Serbia during 3 years. Polytunnels were covered with two foils (both with 57% reduced photosynthetic active radiation, PAR) differing in UV-A and UV-B transmittance. The aim of our work was to determine the influence of light conditions on accumulation of phytonutrients (carotenoids and phenolics) in the peel and flesh of ripe tomato fruits. The amount of effective antioxidants, caffeic acid, and quercetin (phenolics with ortho-dihydroxy substitution) in the peel was the highest in tomato fruits grown in the OF (maximal PAR and UV-A and UV-B radiation). Moreover, the content of leaf epidermal flavonoids was the highest in the OF. The content of lycopene and β-carotene in the flesh of tomato fruit was higher under the polytunnel with higher UV-transmittance. Our results showed that selection of the right light conditions (quality and intensity) for tomato production has a significant effect on the accumulation of beneficial phenolics and carotenoids.
MRS Proceedings, 2004
ABSTRACTCarbon nanotubes have shown promising properties for applications in electronic circuits ... more ABSTRACTCarbon nanotubes have shown promising properties for applications in electronic circuits and other device structures. Several device structures have been demonstrated in recent years by manual manipulation of single nanotubes. The integration of large numbers of nanotubes on wafer size substrates, however, has been a challenge.Our approach addressing this issue utilizes nano-patterning methods in combination with plasma enhanced chemical vapor deposition to directly assemble carbon nanotubes on wafer structures. A secondary formation step is used to actually form device structures connecting the nanotubes to electrode structures. We present first results demonstrating the feasibility of our approach. Electrode structures were prepared using multi-step electron beam lithography processes. Carbon nanotubes were grown in pre-defined locations, and contact formation procedures were carried out to establish multi-terminal contact structures.
2008 IEEE Antennas and Propagation Society International Symposium, 2008
This paper details a compact, reconfigurable channel emulator (CRCE) specifically designed to cre... more This paper details a compact, reconfigurable channel emulator (CRCE) specifically designed to create severe, multipath fading channels. The CRCE is a chamber that, unlike anechoic or reverberation chambers, provides non-uniform fading profiles for wireless devices placed within. In particular, the contribution of this work is that the CRCE is capable of creating not only Ricean and Rayleigh fading profiles, but
2006 IEEE Annual Wireless and Microwave Technology Conference, 2006
Recently, measured channel responses for wireless links in airframes, busses and helicopter envir... more Recently, measured channel responses for wireless links in airframes, busses and helicopter environments have demonstrated that frequency-selective fading can be more severe than predicted by the Rayleigh channel model. The work herein investigates simple diversity methods as a means to mitigate such fading which is referred to as exhibiting hyper-Rayleigh behavior. In particular, the work presents the gains achieved by
2007 IEEE Antennas and Propagation International Symposium, 2007
ABSTRACT
Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation, 2012
ABSTRACT A C-band, six-element slot-coupled microstrip antenna array is presented. The array arch... more ABSTRACT A C-band, six-element slot-coupled microstrip antenna array is presented. The array architecture employs a dual series feeding mechanism, where opposite ends of the array are fed with equal but anti-phase signals in order to maintain a broadside pattern over frequency. This approach facilitates the use of the 6-element panel in high gain, omni-directional arrays for airborne applications that require frequency-hopping capability. The elevation pattern stability is shown from 4.5 GHz to 5.5 GHz and the measured gain of the array is 12.6 dB.
IEEE Transactions on Antennas and Propagation, 2012
ABSTRACT
IEEE Microwave Magazine, 2009
When people talk about which universities have the strongest microwave program, will they mention... more When people talk about which universities have the strongest microwave program, will they mention your school? The typical route that students get involved with IEEE activities is by joining an IEEE Student Branch through their university; there are over 1,400 Student Branches worldwide. IEEE Student Members can then join MTT-S to receive Society periodicals and get discounts at MTT-S conferences.