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FFH scientific research papers database
FFH database search (1991-2022):
1461.
Farantos, S C; Filippou, E; Stamatiadis, S; Froudakis, G E; Mühlhäuser, M; Peric, M; Massaouti, M; Sfounis, A; Velegrakis, M
The excited states of Sr+CO: Photofragmentation spectra and ab initio calculations Journal Article
In: Chemical Physics Letters, vol. 379, no. 3-4, pp. 242-247, 2003.
@article{Farantos2003242,
title = {The excited states of Sr+CO: Photofragmentation spectra and ab initio calculations},
author = {S C Farantos and E Filippou and S Stamatiadis and G E Froudakis and M Mühlhäuser and M Peric and M Massaouti and A Sfounis and M Velegrakis},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0141793611&doi=10.1016%2fj.cplett.2003.08.035&partnerID=40&md5=9a14129d06647b4a263ce66f18865bda},
doi = {10.1016/j.cplett.2003.08.035},
year = {2003},
date = {2003-01-01},
journal = {Chemical Physics Letters},
volume = {379},
number = {3-4},
pages = {242-247},
abstract = {The first absorption band in the photofragmentation spectroscopy of Sr +CO, is recorded in the energy region between 15600 and 16200 cm -1. The spectrum is characterized by a sharp peak between two zones with broad peaks. In contrast to this, the second absorption band observed in the energy interval of 19000-23000 cm-1 shows a regular vibrational structure accompanied by a low intensity shoulder which covers the energy up to the dissociation. Electronic multi-reference configuration interaction calculations in the 2-D nuclear configuration space with the CO bond frozen provide a qualitative explanation of the spectra. © 2003 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The first absorption band in the photofragmentation spectroscopy of Sr +CO, is recorded in the energy region between 15600 and 16200 cm -1. The spectrum is characterized by a sharp peak between two zones with broad peaks. In contrast to this, the second absorption band observed in the energy interval of 19000-23000 cm-1 shows a regular vibrational structure accompanied by a low intensity shoulder which covers the energy up to the dissociation. Electronic multi-reference configuration interaction calculations in the 2-D nuclear configuration space with the CO bond frozen provide a qualitative explanation of the spectra. © 2003 Elsevier B.V. All rights reserved.
1462.
Jakovljević, B; Stevanović, O; Bačić, G
Metastases to the breast from small-cell lung cancer: MR findings - A case report Journal Article
In: Acta Radiologica, vol. 44, no. 5, pp. 485-488, 2003.
@article{Jakovljević2003485,
title = {Metastases to the breast from small-cell lung cancer: MR findings - A case report},
author = {B Jakovljević and O Stevanović and G Bačić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0141755323&doi=10.1034%2fj.1600-0455.2003.00114.x&partnerID=40&md5=a2d288e90e310127ee5b21466459e85d},
doi = {10.1034/j.1600-0455.2003.00114.x},
year = {2003},
date = {2003-01-01},
journal = {Acta Radiologica},
volume = {44},
number = {5},
pages = {485-488},
abstract = {We report a case of blood-borne metastatic breast disease of small-cell lung cancer in a 44-year-old patient with no previous history of malignancy. The possibilities of MR in the early detection of breast metastases and their appearance on MR images are discussed. Metastases to the breast should be considered when MR mammography of the breast reveals multiple, bilateral, well-defined lesions with ring enhancement and wash-out pattern.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We report a case of blood-borne metastatic breast disease of small-cell lung cancer in a 44-year-old patient with no previous history of malignancy. The possibilities of MR in the early detection of breast metastases and their appearance on MR images are discussed. Metastases to the breast should be considered when MR mammography of the breast reveals multiple, bilateral, well-defined lesions with ring enhancement and wash-out pattern.
1463.
Marković, J M Dimitrić; Ignjatović, L M; Marković, D A; Baranac, J M
Antioxidative capabilities of some organic acids and their co-pigments with malvin: Part II Journal Article
In: Journal of Electroanalytical Chemistry, vol. 553, no. SUPPL., pp. 177-182, 2003.
@article{DimitrićMarković2003177,
title = {Antioxidative capabilities of some organic acids and their co-pigments with malvin: Part II},
author = {J M Dimitrić Marković and L M Ignjatović and D A Marković and J M Baranac},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0042693022&doi=10.1016%2fS0022-0728%2803%2900320-6&partnerID=40&md5=fb2c430506b8235c2e03e2f359d9f8de},
doi = {10.1016/S0022-0728(03)00320-6},
year = {2003},
date = {2003-01-01},
journal = {Journal of Electroanalytical Chemistry},
volume = {553},
number = {SUPPL.},
pages = {177-182},
abstract = {Antioxidative properties of ferulic, sinapic, and tannic acids, and their co-pigment with an anthocyan molecule, malvin, were electrochemically observed by cyclic voltammetry. The values of oxidation potentials were used as a quantitative parameter in determining oxidation capabilities of the compounds. These values imply the following sequence of increasing antioxidative effect: ferulic acid
pubstate = {published},
tppubtype = {article}
}
Antioxidative properties of ferulic, sinapic, and tannic acids, and their co-pigment with an anthocyan molecule, malvin, were electrochemically observed by cyclic voltammetry. The values of oxidation potentials were used as a quantitative parameter in determining oxidation capabilities of the compounds. These values imply the following sequence of increasing antioxidative effect: ferulic acid<sinapic acid<tannic acid. Antioxidative capabilities of malvin co-pigments with the above acids are more pronounced in a buffer solution at pH 3.6 than in a solution at pH 2.5. The co-pigment malvin-ferulic acid oxidizes more easily than the other co-pigments of malvin with organic acids investigated. © 2003 Elsevier B.V. All rights reserved.
1464.
Marković, J M Dimitrić; Ignjatović, L M; Marković, D A; Baranac, J M
Antioxidative capabilities of some organic acids and their co-pigments with malvin: Part I Journal Article
In: Journal of Electroanalytical Chemistry, vol. 553, no. SUPPL., pp. 169-175, 2003.
@article{DimitrićMarković2003169,
title = {Antioxidative capabilities of some organic acids and their co-pigments with malvin: Part I},
author = {J M Dimitrić Marković and L M Ignjatović and D A Marković and J M Baranac},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0041691172&doi=10.1016%2fS0022-0728%2803%2900322-X&partnerID=40&md5=a62e67d2f0d516bf5b2196fb83684a2a},
doi = {10.1016/S0022-0728(03)00322-X},
year = {2003},
date = {2003-01-01},
journal = {Journal of Electroanalytical Chemistry},
volume = {553},
number = {SUPPL.},
pages = {169-175},
abstract = {Oxidation potentials of caffeic and chlorogenic acids, and their co-pigments with an anthocyan molecule, malvin, were measured by cyclic voltamemetry. It was found that these acids show electrochemical activity in a wide range of pH values of the supporting electrolyte, and that they undergo a similar mechanisms of electrode oxidation. The oxidation potential values indicated good antioxidative properties found with these acids. It was concluded that the antioxidative effect of molecules depend on the pH and on the structure, i.e. the number and position of hydroxyl groups in molecules, as well. The pK-values of the acids determined spectrophotometrically corresponded to pH ranges in which deprotonation processes influence the electrochemical mechanism. The co-pigments formed from malvin and the acids investigated showed better 'antioxidative properties' than pure malvin, but they were somewhat weaker than those for pure acids. © 2003 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Oxidation potentials of caffeic and chlorogenic acids, and their co-pigments with an anthocyan molecule, malvin, were measured by cyclic voltamemetry. It was found that these acids show electrochemical activity in a wide range of pH values of the supporting electrolyte, and that they undergo a similar mechanisms of electrode oxidation. The oxidation potential values indicated good antioxidative properties found with these acids. It was concluded that the antioxidative effect of molecules depend on the pH and on the structure, i.e. the number and position of hydroxyl groups in molecules, as well. The pK-values of the acids determined spectrophotometrically corresponded to pH ranges in which deprotonation processes influence the electrochemical mechanism. The co-pigments formed from malvin and the acids investigated showed better 'antioxidative properties' than pure malvin, but they were somewhat weaker than those for pure acids. © 2003 Elsevier B.V. All rights reserved.
1465.
Nikolić, N; Veselinović, D; Vučina, J; Lingeman, H; Karljiković-Rajić, K
Chiral ligand-exchange chromatography for diastereo-enantio separation of exametazime Journal Article
In: Journal of Pharmaceutical and Biomedical Analysis, vol. 32, no. 6, pp. 1159-1166, 2003.
@article{Nikolić20031159,
title = {Chiral ligand-exchange chromatography for diastereo-enantio separation of exametazime},
author = {N Nikolić and D Veselinović and J Vučina and H Lingeman and K Karljiković-Rajić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0043205804&doi=10.1016%2fS0731-7085%2803%2900230-9&partnerID=40&md5=98e233387ce541c321ab6232c6249892},
doi = {10.1016/S0731-7085(03)00230-9},
year = {2003},
date = {2003-01-01},
journal = {Journal of Pharmaceutical and Biomedical Analysis},
volume = {32},
number = {6},
pages = {1159-1166},
abstract = {The diastereo-enantio separation of isomeric mixtures of exametazime (HM-PAO) by liquid chromatography is described using an achiral sorbent (RP-18). A chiral eluent with the initial complex of Cu(II) and the optically active selector N,N-dimethyl-l-phenylalanine (l-DM-PhA), based on the ligand-exchange principle, has been applied. The separation is based on the presence of the immobilized binary complex Cu(l-DM-PhA)2 and formation of mixed ternary complex. The optimal mole ratio of Cu(II):l-DM-PhA is 1:4, the pH should be between 4.1 and 4.2 and up to 0.8 mM of triethylamine is added for column presaturation with the initial complex. The elution order has been defined using isolated l-HM-PAO via l-HM-PAO L(+)tartrate and meso-HM-PAO obtained by repeated recrystallization from the isomeric mixture of HM-PAO. Complete resolution between all isomers (RS from 2.14 to 3.91) and partial resolution for mesoEE/l-HM-PAO (RS=0.83) has been obtained. This means that the proposed chiral ligand-exchange chromatography (CLEC) can be used for determination of the isomeric purity of HM-PAO. This as an alternative method for resolution measurements with chiral columns. © 2003 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The diastereo-enantio separation of isomeric mixtures of exametazime (HM-PAO) by liquid chromatography is described using an achiral sorbent (RP-18). A chiral eluent with the initial complex of Cu(II) and the optically active selector N,N-dimethyl-l-phenylalanine (l-DM-PhA), based on the ligand-exchange principle, has been applied. The separation is based on the presence of the immobilized binary complex Cu(l-DM-PhA)2 and formation of mixed ternary complex. The optimal mole ratio of Cu(II):l-DM-PhA is 1:4, the pH should be between 4.1 and 4.2 and up to 0.8 mM of triethylamine is added for column presaturation with the initial complex. The elution order has been defined using isolated l-HM-PAO via l-HM-PAO L(+)tartrate and meso-HM-PAO obtained by repeated recrystallization from the isomeric mixture of HM-PAO. Complete resolution between all isomers (RS from 2.14 to 3.91) and partial resolution for mesoEE/l-HM-PAO (RS=0.83) has been obtained. This means that the proposed chiral ligand-exchange chromatography (CLEC) can be used for determination of the isomeric purity of HM-PAO. This as an alternative method for resolution measurements with chiral columns. © 2003 Elsevier B.V. All rights reserved.
1466.
Markovic, S; Dondur, V; Dimitrijevic, R
FTIR spectroscopy of framework aluminosilicate structures: Carnegieite and pure sodium nepheline Journal Article
In: Journal of Molecular Structure, vol. 654, no. 1-3, pp. 223-234, 2003.
@article{Markovic2003223,
title = {FTIR spectroscopy of framework aluminosilicate structures: Carnegieite and pure sodium nepheline},
author = {S Markovic and V Dondur and R Dimitrijevic},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0038510961&doi=10.1016%2fS0022-2860%2803%2900249-7&partnerID=40&md5=8b7e86db7978b785f1ea7fc4a06a3aca},
doi = {10.1016/S0022-2860(03)00249-7},
year = {2003},
date = {2003-01-01},
journal = {Journal of Molecular Structure},
volume = {654},
number = {1-3},
pages = {223-234},
abstract = {In this work the spectroscopic studies of polymorph transformation of framework silicates containing six-membered rings and different Si/Al ratio were carried out. Two model systems with different stoichiometries (Na-LTA, Si/Al = 1 and Na-FAU, Si/Al = 1.23) were investigated. Thermally induced phase transformations of initial zeolites resulted in forming of stuffed derivatives of cristobalite (carnegieite) and tridymite (nepheline). Powder XRD method was used for the recognition of new phases. All obtained phases have framework structures built by single six-membered rings. The changes of middle range order (rings symmetry), which take place during transformations of Na-LTA and Na-FAU into low-temperature camegieite, low-temperature camegieite into pure sodium (ps) nepheline as well as ps-nepheline into high-temperature camegieite, were investigated by IR spectroscopy. The rings symmetry is found to be dependent on a phase stoichiometry as well as on polymorph type. © 2003 Elsevier Science B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this work the spectroscopic studies of polymorph transformation of framework silicates containing six-membered rings and different Si/Al ratio were carried out. Two model systems with different stoichiometries (Na-LTA, Si/Al = 1 and Na-FAU, Si/Al = 1.23) were investigated. Thermally induced phase transformations of initial zeolites resulted in forming of stuffed derivatives of cristobalite (carnegieite) and tridymite (nepheline). Powder XRD method was used for the recognition of new phases. All obtained phases have framework structures built by single six-membered rings. The changes of middle range order (rings symmetry), which take place during transformations of Na-LTA and Na-FAU into low-temperature camegieite, low-temperature camegieite into pure sodium (ps) nepheline as well as ps-nepheline into high-temperature camegieite, were investigated by IR spectroscopy. The rings symmetry is found to be dependent on a phase stoichiometry as well as on polymorph type. © 2003 Elsevier Science B.V. All rights reserved.
1467.
Ristić, G S; Bogdanov, Z D; Zec, S; Romčević, N; Dohčević-Mitrović, Z; Miljanić, S S
Effect of the substrate material on diamond CVD coating properties Journal Article
In: Materials Chemistry and Physics, vol. 80, no. 2, pp. 529-536, 2003.
@article{Ristić2003529,
title = {Effect of the substrate material on diamond CVD coating properties},
author = {G S Ristić and Z D Bogdanov and S Zec and N Romčević and Z Dohčević-Mitrović and S S Miljanić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037467531&doi=10.1016%2fS0254-0584%2803%2900094-4&partnerID=40&md5=44e20424d9117f8ead0695c7014bd619},
doi = {10.1016/S0254-0584(03)00094-4},
year = {2003},
date = {2003-01-01},
journal = {Materials Chemistry and Physics},
volume = {80},
number = {2},
pages = {529-536},
abstract = {Diamond coatings were deposited onto different substrates (Cu, Si, WC-Co, Mo) by hot-filament chemical vapor deposition (CVD). Characterization of the obtained coatings was performed using scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis, Raman spectroscopy and Fourier transform infrared reflection (FTIR) spectroscopy. The results and observed differences are discussed from the aspect of the chemical nature of the substrate and its reactivity with a gaseous medium. © 2003 Elsevier Science B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Diamond coatings were deposited onto different substrates (Cu, Si, WC-Co, Mo) by hot-filament chemical vapor deposition (CVD). Characterization of the obtained coatings was performed using scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis, Raman spectroscopy and Fourier transform infrared reflection (FTIR) spectroscopy. The results and observed differences are discussed from the aspect of the chemical nature of the substrate and its reactivity with a gaseous medium. © 2003 Elsevier Science B.V. All rights reserved.
1468.
Stojić, D. Lj.; Marčeta, M P; Sovilj, S P; Miljanić, S S
Hydrogen generation from water electrolysis - Possibilities of energy saving Journal Article
In: Journal of Power Sources, vol. 118, no. 1-2, pp. 315-319, 2003.
@article{Stojić2003315,
title = {Hydrogen generation from water electrolysis - Possibilities of energy saving},
author = {D.Lj. Stojić and M P Marčeta and S P Sovilj and S S Miljanić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0038582373&doi=10.1016%2fS0378-7753%2803%2900077-6&partnerID=40&md5=3b6983e06e08f6793b52d88b1dcb8f96},
doi = {10.1016/S0378-7753(03)00077-6},
year = {2003},
date = {2003-01-01},
journal = {Journal of Power Sources},
volume = {118},
number = {1-2},
pages = {315-319},
abstract = {Hydrogen production via electrolysis of water from alkaline aqueous electrolytes is a well-established conventional technology. However, due to high energy requirements of about 4.5-5kWh/m n 3 H 2 in most industrial electrolysers, the cost of hydrogen produced in such a way is high. This is a limiting factor for the use of this method on a large scale, except in countries where the electricity is very cheap. There were various attempts to improve this process, like zero-gap cell geometry, development of new diaphragm materials, development of new electrocatalytic materials for electrodes, etc. We tried here to use ionic activators to reduce energy consumption. Two types of activators, both ethylenediamine complexes of cobalt, were used separately or in combination with some molybdates. The activation energies were significantly decreased in the presence of single ionic activators. However, the best results regarding the activation energy reduction were obtained when combinations with the molybdate were used. On the basis of the results of our experiments there is a strong indication that the activation with ionic activators reduces energy needs per mass unit of hydrogen produced for more than 10% in some cases, compared to those of non-activated electrolytes. © 2003 Elsevier Science B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Hydrogen production via electrolysis of water from alkaline aqueous electrolytes is a well-established conventional technology. However, due to high energy requirements of about 4.5-5kWh/m n 3 H 2 in most industrial electrolysers, the cost of hydrogen produced in such a way is high. This is a limiting factor for the use of this method on a large scale, except in countries where the electricity is very cheap. There were various attempts to improve this process, like zero-gap cell geometry, development of new diaphragm materials, development of new electrocatalytic materials for electrodes, etc. We tried here to use ionic activators to reduce energy consumption. Two types of activators, both ethylenediamine complexes of cobalt, were used separately or in combination with some molybdates. The activation energies were significantly decreased in the presence of single ionic activators. However, the best results regarding the activation energy reduction were obtained when combinations with the molybdate were used. On the basis of the results of our experiments there is a strong indication that the activation with ionic activators reduces energy needs per mass unit of hydrogen produced for more than 10% in some cases, compared to those of non-activated electrolytes. © 2003 Elsevier Science B.V. All rights reserved.
1469.
Perić, M; Stevanović, L
In: International Journal of Quantum Chemistry, vol. 92, no. 3, pp. 276-293, 2003.
@article{Perić2003276,
title = {Use of the normal coordinates in variational and perturbative ab initio handling of the vibronic and spin-orbit couplings in Π electronic states of linear tetra-atomic molecules},
author = {M Perić and L Stevanović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037420402&doi=10.1002%2fqua.10484&partnerID=40&md5=1cad3d9c99f31f1e22f8f4bc43004820},
doi = {10.1002/qua.10484},
year = {2003},
date = {2003-01-01},
journal = {International Journal of Quantum Chemistry},
volume = {92},
number = {3},
pages = {276-293},
abstract = {A variational and a perturbative approach are developed to handle the combined effect of the vibronic and spin-orbit couplings in Π electronic states of tetra-atomic molecules with linear equilibrium geometry. Both of them are based on the use of the normal vibrational bending coordinates. The perturbative treatment is carried out via two schemes for partition of the model Hamiltonian: In the first, the spin-orbit coupling term is treated as a perturbation; in the second, it is included in the zeroth-order Hamiltonian. It is demonstrated that both perturbative approaches lead to the same second-order formulae when the spin-orbit coupling constant is small compared to the bending frequency, but much larger than the splitting of potential surfaces upon bending. These approaches are used to calculate the vibronic and spin-orbit structure in the X 2 Π electronic state of HCCS by employing the ab initio-computed potential energy surfaces. Complete numerical equivalence of the results obtained with the present variational approach and those generated by the algorithms employing internal vibrational coordinates is demonstrated. The restrictions concerning the applicability of the perturbative approaches are discussed in terms of the agreement between the results obtained by means of them with those generated in the corresponding variational computations. The general reliability of the model employed is checked by comparing the theoretical results with the available experimental data.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A variational and a perturbative approach are developed to handle the combined effect of the vibronic and spin-orbit couplings in Π electronic states of tetra-atomic molecules with linear equilibrium geometry. Both of them are based on the use of the normal vibrational bending coordinates. The perturbative treatment is carried out via two schemes for partition of the model Hamiltonian: In the first, the spin-orbit coupling term is treated as a perturbation; in the second, it is included in the zeroth-order Hamiltonian. It is demonstrated that both perturbative approaches lead to the same second-order formulae when the spin-orbit coupling constant is small compared to the bending frequency, but much larger than the splitting of potential surfaces upon bending. These approaches are used to calculate the vibronic and spin-orbit structure in the X 2 Π electronic state of HCCS by employing the ab initio-computed potential energy surfaces. Complete numerical equivalence of the results obtained with the present variational approach and those generated by the algorithms employing internal vibrational coordinates is demonstrated. The restrictions concerning the applicability of the perturbative approaches are discussed in terms of the agreement between the results obtained by means of them with those generated in the corresponding variational computations. The general reliability of the model employed is checked by comparing the theoretical results with the available experimental data.
1470.
Grgurić-Šipka, S R; Sabo, T J; Trifunović, S R; Minić, D M
Investigation of thermal stability and kinetics of thermal degradation of meridional isomers of aminocarboxylato cobalt(III) complexes Journal Article
In: Thermochimica Acta, vol. 399, no. 1-2, pp. 145-152, 2003.
@article{Grgurić-Šipka2003145,
title = {Investigation of thermal stability and kinetics of thermal degradation of meridional isomers of aminocarboxylato cobalt(III) complexes},
author = {S R Grgurić-Šipka and T J Sabo and S R Trifunović and D M Minić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037463903&doi=10.1016%2fS0040-6031%2802%2900458-6&partnerID=40&md5=9b8d93d9b77236a11defbe0b07493f3c},
doi = {10.1016/S0040-6031(02)00458-6},
year = {2003},
date = {2003-01-01},
journal = {Thermochimica Acta},
volume = {399},
number = {1-2},
pages = {145-152},
abstract = {The thermal properties of some mixed complexes of cobalt(III) containing tetradentate ethylenediamine-N,N′-di-3-propionate (eddp) ligand and several amino acids were investigated by thermogravimetry (TG) and differential scanning calorimetry (DSC). The thermal stability derived from decomposition temperatures was discussed in terms of amino acid present. It was shown that the processes of thermal decomposition of these complexes are multi-step degradation processes. Some of these can be separated into individual steps. The corresponding kinetic and thermodynamic parameters of these processes were determined, and the possible mechanisms were discussed. © 2002 Elsevier Science B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The thermal properties of some mixed complexes of cobalt(III) containing tetradentate ethylenediamine-N,N′-di-3-propionate (eddp) ligand and several amino acids were investigated by thermogravimetry (TG) and differential scanning calorimetry (DSC). The thermal stability derived from decomposition temperatures was discussed in terms of amino acid present. It was shown that the processes of thermal decomposition of these complexes are multi-step degradation processes. Some of these can be separated into individual steps. The corresponding kinetic and thermodynamic parameters of these processes were determined, and the possible mechanisms were discussed. © 2002 Elsevier Science B.V. All rights reserved.
1471.
Perić, M; Mladenović, M; Tomić, K; Marian, C M
Ab initio study of the vibronic and spin-orbit structure in the X2Π electronic state of CCCH Journal Article
In: Journal of Chemical Physics, vol. 118, no. 10, pp. 4444-4451, 2003.
@article{Perić20034444,
title = {Ab initio study of the vibronic and spin-orbit structure in the X2Π electronic state of CCCH},
author = {M Perić and M Mladenović and K Tomić and C M Marian},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037426133&doi=10.1063%2f1.1543155&partnerID=40&md5=6c196d249890546fe8ee32aabfddba80},
doi = {10.1063/1.1543155},
year = {2003},
date = {2003-01-01},
journal = {Journal of Chemical Physics},
volume = {118},
number = {10},
pages = {4444-4451},
abstract = {In the framework of ab initio study, the vibronic and spin-orbit couplings in the X2Π electronic state of the CCCH radical were considered. The values for various spectroscopic parameters computed agree satisfactorily with the results of previous experimental and theoretical works. Calculation results explain why the measured spin-orbit splitting in the lowest-lying vibronic species is approximately equal to half the value of the spin-orbit coupling constant.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In the framework of ab initio study, the vibronic and spin-orbit couplings in the X2Π electronic state of the CCCH radical were considered. The values for various spectroscopic parameters computed agree satisfactorily with the results of previous experimental and theoretical works. Calculation results explain why the measured spin-orbit splitting in the lowest-lying vibronic species is approximately equal to half the value of the spin-orbit coupling constant.
1472.
Jugović, D; Cvjetićanin, N; Kusigerski, V; Mentus, S
Synthesis of LiMn2O4 by glycine-nitrate method Journal Article
In: Journal of Optoelectronics and Advanced Materials, vol. 5, no. 1, pp. 343-346, 2003.
@article{Jugović2003343,
title = {Synthesis of LiMn2O4 by glycine-nitrate method},
author = {D Jugović and N Cvjetićanin and V Kusigerski and S Mentus},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0346965192&partnerID=40&md5=9f8f62a974aa54abaebdb38a7a028721},
year = {2003},
date = {2003-01-01},
journal = {Journal of Optoelectronics and Advanced Materials},
volume = {5},
number = {1},
pages = {343-346},
abstract = {Glycine-nitrate method was used to synthesize lithium manganese oxides. For the molar ratio of lithium-to-manganese in precursor solution equal to 1:2 spinel LiMn2O4 was obtained. For molar ratio of 1:1 a mixture of Li2MnO3 and spinel phase different from LiMn2O4 was observed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Glycine-nitrate method was used to synthesize lithium manganese oxides. For the molar ratio of lithium-to-manganese in precursor solution equal to 1:2 spinel LiMn2O4 was obtained. For molar ratio of 1:1 a mixture of Li2MnO3 and spinel phase different from LiMn2O4 was observed.
1473.
Kuzmanović, M M; Pavlović, M S; Savović, J J; Marinković, M
Temporal responses of spectral line intensities emitted by d.c. arc plasma with aerosol supply studied by power interruption technique Journal Article
In: Spectrochimica Acta - Part B Atomic Spectroscopy, vol. 58, no. 2, pp. 239-248, 2003.
@article{Kuzmanović2003239,
title = {Temporal responses of spectral line intensities emitted by d.c. arc plasma with aerosol supply studied by power interruption technique},
author = {M M Kuzmanović and M S Pavlović and J J Savović and M Marinković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037415645&doi=10.1016%2fS0584-8547%2802%2900256-2&partnerID=40&md5=79dda1cef25e3c08644fb302e99759ca},
doi = {10.1016/S0584-8547(02)00256-2},
year = {2003},
date = {2003-01-01},
journal = {Spectrochimica Acta - Part B Atomic Spectroscopy},
volume = {58},
number = {2},
pages = {239-248},
abstract = {The responses to the fast interruption of the arc current have been studied for the spectral line intensities of several elements emitted by U-shaped direct current (d.c.) arc plasma with aerosol supply. The arc was burned at atmospheric pressure. Solutions containing the investigated elements were introduced with a concentric glass nebulizer into the argon stream of 2.7 lmin -1 . The arc current of 6 A was interrupted in periods that lasted up to 200 μs. At the moment of power interruption, the spectral line intensities are either suddenly increased indicating Saha balance or suddenly decreased indicating Boltzmann balance. Plots of intensity vs. time are used to evaluate the mechanisms that maintain the populations of excited states in the stationary state and processes occurring in the plasma during the power-off period. Excited levels of the elements with high ionization energies, like Ar, H and O, are predominantly populated by three-body recombination process i.e. they are controlled by the Saha balance. Excited levels of elements with medium ionization energies are predominantly populated by collisions with electrons i.e. controlled by the Boltzmann balance. Some of the spectral lines of C, P and Hg with high-excited levels missed the sudden intensity change, a cooling jump, which could be interpreted by the presence of two opposite mechanisms, Saha and Boltzmann balances, that cancel out the effect. Spectral line responses of easily ionized elements were found to depend on the plasma region. In a 2-mm axis region, the intensities do not show a cooling jump, but increase slowly during the power-off period. At medium distances from the arc axis, the spectral lines show typical Boltzmann type response. Farther to the arc periphery, where the electron concentration is very low but emission is still high, the power interruption does not influence the intensities and this indicates that the excitation is not prevailed by electron collisions. © 2002 Elsevier Science B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The responses to the fast interruption of the arc current have been studied for the spectral line intensities of several elements emitted by U-shaped direct current (d.c.) arc plasma with aerosol supply. The arc was burned at atmospheric pressure. Solutions containing the investigated elements were introduced with a concentric glass nebulizer into the argon stream of 2.7 lmin -1 . The arc current of 6 A was interrupted in periods that lasted up to 200 μs. At the moment of power interruption, the spectral line intensities are either suddenly increased indicating Saha balance or suddenly decreased indicating Boltzmann balance. Plots of intensity vs. time are used to evaluate the mechanisms that maintain the populations of excited states in the stationary state and processes occurring in the plasma during the power-off period. Excited levels of the elements with high ionization energies, like Ar, H and O, are predominantly populated by three-body recombination process i.e. they are controlled by the Saha balance. Excited levels of elements with medium ionization energies are predominantly populated by collisions with electrons i.e. controlled by the Boltzmann balance. Some of the spectral lines of C, P and Hg with high-excited levels missed the sudden intensity change, a cooling jump, which could be interpreted by the presence of two opposite mechanisms, Saha and Boltzmann balances, that cancel out the effect. Spectral line responses of easily ionized elements were found to depend on the plasma region. In a 2-mm axis region, the intensities do not show a cooling jump, but increase slowly during the power-off period. At medium distances from the arc axis, the spectral lines show typical Boltzmann type response. Farther to the arc periphery, where the electron concentration is very low but emission is still high, the power interruption does not influence the intensities and this indicates that the excitation is not prevailed by electron collisions. © 2002 Elsevier Science B.V. All rights reserved.
1474.
Micic, M; Radotic, K; Jeremic, M; Leblanc, R M
Study of self-assembly of the lignin model compound on cellulose model substrate Journal Article
In: Macromolecular Bioscience, vol. 3, no. 2, pp. 100-106, 2003.
@article{Micic2003100,
title = {Study of self-assembly of the lignin model compound on cellulose model substrate},
author = {M Micic and K Radotic and M Jeremic and R M Leblanc},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037542924&doi=10.1002%2fmabi.200390011&partnerID=40&md5=e5bf781720f8fc07ad4d35eed6bf2969},
doi = {10.1002/mabi.200390011},
year = {2003},
date = {2003-01-01},
journal = {Macromolecular Bioscience},
volume = {3},
number = {2},
pages = {100-106},
abstract = {Herein we report a topographical study of the supramolecular organization of enzymatically polymerized lignin model compound - dehydrogenative polymer (DHP) of coniferyl alcohol - on cellulose substrate, using the Environmental Scanning Electron Microscopic (ESEM) technique. A comparison of deposits obtained by bulk polymerization in solution and direct polymerization in the presence of cellulose substrate shows distinct differences in supramolecular organization. DHP polymerized in solution expresses a 3-D structure with short-range ordered motifs, while the polymer formed in the presence of cellulose substrate arranges in a single layer compact structure consisting of several domains. Such structures could be described as a two-dimensional hexagonal close packed lattice(HCPL), with the dimension of unit cell in 1 μm range. The domains have a quite regular structure with few lattice defect forming a good example of two-dimensional colloidal crystal. The growth of DHP globules and their assembly into a supramolecular structures are interpreted in terms of cooperative electrostatic interaction of polymer precursors, with a framework of cellulose OH groups and interfacial interactions (hydrophilic/hydrophobic) in the course of the structure growth. The results strongly suggest that the carbohydrate matrix in plant cells can serve as a templates for lignin structure formation in the plant cell wall.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Herein we report a topographical study of the supramolecular organization of enzymatically polymerized lignin model compound - dehydrogenative polymer (DHP) of coniferyl alcohol - on cellulose substrate, using the Environmental Scanning Electron Microscopic (ESEM) technique. A comparison of deposits obtained by bulk polymerization in solution and direct polymerization in the presence of cellulose substrate shows distinct differences in supramolecular organization. DHP polymerized in solution expresses a 3-D structure with short-range ordered motifs, while the polymer formed in the presence of cellulose substrate arranges in a single layer compact structure consisting of several domains. Such structures could be described as a two-dimensional hexagonal close packed lattice(HCPL), with the dimension of unit cell in 1 μm range. The domains have a quite regular structure with few lattice defect forming a good example of two-dimensional colloidal crystal. The growth of DHP globules and their assembly into a supramolecular structures are interpreted in terms of cooperative electrostatic interaction of polymer precursors, with a framework of cellulose OH groups and interfacial interactions (hydrophilic/hydrophobic) in the course of the structure growth. The results strongly suggest that the carbohydrate matrix in plant cells can serve as a templates for lignin structure formation in the plant cell wall.
1475.
Ćiric-Marjanović, G; Cvjetićanin, N; Mentus, S
Electrochemical synthesis and structure of poly(2-methyl-1-naphthylamine) films Journal Article
In: Spectroscopy Letters, vol. 36, no. 1-2, pp. 151-165, 2003.
@article{Ćiric-Marjanović2003151,
title = {Electrochemical synthesis and structure of poly(2-methyl-1-naphthylamine) films},
author = {G Ćiric-Marjanović and N Cvjetićanin and S Mentus},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037639753&doi=10.1081%2fSL-120021784&partnerID=40&md5=923c7cb31b54801a7bd68723a921c2ff},
doi = {10.1081/SL-120021784},
year = {2003},
date = {2003-01-01},
journal = {Spectroscopy Letters},
volume = {36},
number = {1-2},
pages = {151-165},
abstract = {A novel polymer, poly(2-methyl-1-naphthylamine), which was synthesized electrochemically at various temperatures from a solution containing 2-methyl-1-naphthylamine, acetic acid and sodium acetate, was characterized by IR spectroscopy. The structural conclusions were based on comparisons of polymer spectra with the IR-spectrum of the monomer, 2-methyl-1-naphthylamine. IR spectroscopy indicates that the electropolymerization proceeds via the -NH 2 groups and that the poly(2- methyl-1-naphthylamine) structure consists of imine (-N=C) and amine (-NH-C) links between naphthalene rings as well as a free methyl groups in the chains. An analysis of the "substitution pattern" region in the polymer's spectra suggests that the polymer molecules were formed via mixed N-C(4), N-C(5) and N-C(7) linkages between repeated units. The ratio of between the 1645 and 1620 cm -1 peak areas decreases with increased temperature during synthesis, indicating that 25°C is the best temperature to obtain higher molecular weights.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A novel polymer, poly(2-methyl-1-naphthylamine), which was synthesized electrochemically at various temperatures from a solution containing 2-methyl-1-naphthylamine, acetic acid and sodium acetate, was characterized by IR spectroscopy. The structural conclusions were based on comparisons of polymer spectra with the IR-spectrum of the monomer, 2-methyl-1-naphthylamine. IR spectroscopy indicates that the electropolymerization proceeds via the -NH 2 groups and that the poly(2- methyl-1-naphthylamine) structure consists of imine (-N=C) and amine (-NH-C) links between naphthalene rings as well as a free methyl groups in the chains. An analysis of the "substitution pattern" region in the polymer's spectra suggests that the polymer molecules were formed via mixed N-C(4), N-C(5) and N-C(7) linkages between repeated units. The ratio of between the 1645 and 1620 cm -1 peak areas decreases with increased temperature during synthesis, indicating that 25°C is the best temperature to obtain higher molecular weights.
1476.
Radić-Perić, J; Pantelić, N
Thermodynamical modeling of silicon carbide synthesis in thermal plasma Journal Article
In: Journal of Thermal Analysis and Calorimetry, vol. 72, no. 1, pp. 35-45, 2003.
@article{Radić-Perić200335,
title = {Thermodynamical modeling of silicon carbide synthesis in thermal plasma},
author = {J Radić-Perić and N Pantelić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0038727269&doi=10.1023%2fA%3a1023943030263&partnerID=40&md5=a12536520b8b145e25979ee80ced1930},
doi = {10.1023/A:1023943030263},
year = {2003},
date = {2003-01-01},
journal = {Journal of Thermal Analysis and Calorimetry},
volume = {72},
number = {1},
pages = {35-45},
abstract = {The synthesis process of solid SiC in thermal plasma was investigated theoretically by computing the equilibrium composition of the gas mixtures involving silicon and carbon in the presence of argon and hydrogen at various silicon/carbon amounts and at two different total pressures in the system, in the temperature range between 1000 and 6000 K. Use is made of the fact that a thermal plasma, by definition, is a plasma in (local) thermodynamical equilibrium, which makes possible the theoretical determination of its equilibrium composition at definite temperature by employing Gibbs free energy data for the compounds present in the system. From the calculated compositions of the investigated gas systems the temperature-composition phase diagrams were obtained. Using these data the temperature zones with saturated and/or oversaturated vapour of SiC as well as of Si and C were determined and the possibility of the formation of SiC in the solid state via different reaction routes was analyzed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The synthesis process of solid SiC in thermal plasma was investigated theoretically by computing the equilibrium composition of the gas mixtures involving silicon and carbon in the presence of argon and hydrogen at various silicon/carbon amounts and at two different total pressures in the system, in the temperature range between 1000 and 6000 K. Use is made of the fact that a thermal plasma, by definition, is a plasma in (local) thermodynamical equilibrium, which makes possible the theoretical determination of its equilibrium composition at definite temperature by employing Gibbs free energy data for the compounds present in the system. From the calculated compositions of the investigated gas systems the temperature-composition phase diagrams were obtained. Using these data the temperature zones with saturated and/or oversaturated vapour of SiC as well as of Si and C were determined and the possibility of the formation of SiC in the solid state via different reaction routes was analyzed.
1477.
Jerosimić, S; Perić, M
Use of the group theory for classification of electronic states of acetylene Journal Article
In: Journal of the Serbian Chemical Society, vol. 68, no. 4-5, pp. 363-381, 2003.
@article{Jerosimić2003363,
title = {Use of the group theory for classification of electronic states of acetylene},
author = {S Jerosimić and M Perić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0038173392&doi=10.2298%2fJSC0305363J&partnerID=40&md5=040465d8adae831da1b86784cf7f08a4},
doi = {10.2298/JSC0305363J},
year = {2003},
date = {2003-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {68},
number = {4-5},
pages = {363-381},
abstract = {The electronic states of the acetylene molecule are classified employing the group theory combined with the use of the Walsh diagrams and some elementary quantum chemical considerations. The results of this analysis are compared with those obtained by explicit ab initio calculations. It is shown that the global structure of the electronic spectrum can be reproduced predicted without carrying out detailed ab initio calculations.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The electronic states of the acetylene molecule are classified employing the group theory combined with the use of the Walsh diagrams and some elementary quantum chemical considerations. The results of this analysis are compared with those obtained by explicit ab initio calculations. It is shown that the global structure of the electronic spectrum can be reproduced predicted without carrying out detailed ab initio calculations.
1478.
Kuzmanović, M M; Antić-Jovanović, A; Stoiljković, M; Pavlović, M S; Marinković, M
In: Spectroscopy Letters, vol. 36, no. 4, pp. 303-312, 2003.
@article{Kuzmanović2003303,
title = {A power interruption technique for determining the difference between electron and gas temperatures in the argon d.c. arc supplied with aqueous aerosol},
author = {M M Kuzmanović and A Antić-Jovanović and M Stoiljković and M S Pavlović and M Marinković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0141841696&doi=10.1081%2fSL-120024580&partnerID=40&md5=b63eee5166707ef33a2a9bea783192c3},
doi = {10.1081/SL-120024580},
year = {2003},
date = {2003-01-01},
journal = {Spectroscopy Letters},
volume = {36},
number = {4},
pages = {303-312},
abstract = {The difference between electron and gas temperatures in a low current U-shaped d.c. arc with aqueous aerosol supply was studied using a power interruption technique. Monitoring of the temporal evolution of recombination continuum after power switch-off revealed that it was necessary to do a correction of the measured values due to a change in electron concentration. It was shown that the plasma studied was a two temperature type and that the temperature difference ranges from 1850 K to 600 K for arc currents from 3 to 10.5 A, respectively. A comparison with literature results for pure argon arc plasma shows that aerosol introduction reduces the temperature difference.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The difference between electron and gas temperatures in a low current U-shaped d.c. arc with aqueous aerosol supply was studied using a power interruption technique. Monitoring of the temporal evolution of recombination continuum after power switch-off revealed that it was necessary to do a correction of the measured values due to a change in electron concentration. It was shown that the plasma studied was a two temperature type and that the temperature difference ranges from 1850 K to 600 K for arc currents from 3 to 10.5 A, respectively. A comparison with literature results for pure argon arc plasma shows that aerosol introduction reduces the temperature difference.
1479.
Bojović, V; Antić-Jovanović, A; Pešić, D; Isailović, D; Kuzmanović, M
Vibrational Analysis of the β System of 10 B 18 O Journal Article
In: Spectroscopy Letters, vol. 36, no. 5-6, pp. 531-536, 2003.
@article{Bojović2003531,
title = {Vibrational Analysis of the β System of 10 B 18 O},
author = {V Bojović and A Antić-Jovanović and D Pešić and D Isailović and M Kuzmanović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0347381012&doi=10.1081%2fSL-120026638&partnerID=40&md5=dd418f579764cd0c4ba89ec1a7f408b9},
doi = {10.1081/SL-120026638},
year = {2003},
date = {2003-01-01},
journal = {Spectroscopy Letters},
volume = {36},
number = {5-6},
pages = {531-536},
abstract = {Ten bands of the β system (B 2 Σ + - X 2 Σ + ) of the 10 B 18 O molecule have been observed for the first time. The spectrum was obtained by emission spectroscopy from a low-pressure arc, at medium dispersion, and vibrationally analyzed using isotope shift measurements. Vibrational analysis gave the constants ω e and ω e X e for both electronic states involved in the transitions.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Ten bands of the β system (B 2 Σ + - X 2 Σ + ) of the 10 B 18 O molecule have been observed for the first time. The spectrum was obtained by emission spectroscopy from a low-pressure arc, at medium dispersion, and vibrationally analyzed using isotope shift measurements. Vibrational analysis gave the constants ω e and ω e X e for both electronic states involved in the transitions.
1480.
Pejić, N; Anić, S; Kuntić, V; Vukojević, V; Kolar-Anić, L
Kinetic Determination of Microquantities of Rutin by Perturbation of the Bray-Liebhafsky Oscillatory Reaction in an Open System Journal Article
In: Microchimica Acta, vol. 143, no. 4, pp. 261-267, 2003.
@article{Pejić2003261,
title = {Kinetic Determination of Microquantities of Rutin by Perturbation of the Bray-Liebhafsky Oscillatory Reaction in an Open System},
author = {N Pejić and S Anić and V Kuntić and V Vukojević and L Kolar-Anić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-1542343915&doi=10.1007%2fs00604-003-0071-8&partnerID=40&md5=a3962926c688336cbf0f35fd9effebe4},
doi = {10.1007/s00604-003-0071-8},
year = {2003},
date = {2003-01-01},
journal = {Microchimica Acta},
volume = {143},
number = {4},
pages = {261-267},
abstract = {A kinetic method is described for the microquantitative (microconcentration/microvolume) determination of rutin based on potentiometric monitoring of the concentration perturbations of the Bray-Liebhafsky (BL) oscillatory reaction being in a non-equilibrium stationary state close to a bifurcation point. The experiments are carried out in an open reactor. The response of the matrix system to perturbations by different concentrations of rutin ethanolic solutions is followed by a Pt-electrode. In the concentration range between 7.8 × 10 -8 mol dm -3 and 9.1 × 10 -6 mol dm -3 , we found a linear dependence of the maximal potential shift, ΔE m , on the logarithm of the rutin concentrations. The unknown concentrations can be determined from the calibration curve up to an accuracy of ±5%. The detection limit is 3.6 × 10 -8 mol dm -3 . The amount of required sample can be as small as 10 μL.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A kinetic method is described for the microquantitative (microconcentration/microvolume) determination of rutin based on potentiometric monitoring of the concentration perturbations of the Bray-Liebhafsky (BL) oscillatory reaction being in a non-equilibrium stationary state close to a bifurcation point. The experiments are carried out in an open reactor. The response of the matrix system to perturbations by different concentrations of rutin ethanolic solutions is followed by a Pt-electrode. In the concentration range between 7.8 × 10 -8 mol dm -3 and 9.1 × 10 -6 mol dm -3 , we found a linear dependence of the maximal potential shift, ΔE m , on the logarithm of the rutin concentrations. The unknown concentrations can be determined from the calibration curve up to an accuracy of ±5%. The detection limit is 3.6 × 10 -8 mol dm -3 . The amount of required sample can be as small as 10 μL.
2003
Farantos, S C; Filippou, E; Stamatiadis, S; Froudakis, G E; Mühlhäuser, M; Peric, M; Massaouti, M; Sfounis, A; Velegrakis, M
The excited states of Sr+CO: Photofragmentation spectra and ab initio calculations Journal Article
In: Chemical Physics Letters, vol. 379, no. 3-4, pp. 242-247, 2003.
@article{Farantos2003242,
title = {The excited states of Sr+CO: Photofragmentation spectra and ab initio calculations},
author = {S C Farantos and E Filippou and S Stamatiadis and G E Froudakis and M Mühlhäuser and M Peric and M Massaouti and A Sfounis and M Velegrakis},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0141793611&doi=10.1016%2fj.cplett.2003.08.035&partnerID=40&md5=9a14129d06647b4a263ce66f18865bda},
doi = {10.1016/j.cplett.2003.08.035},
year = {2003},
date = {2003-01-01},
journal = {Chemical Physics Letters},
volume = {379},
number = {3-4},
pages = {242-247},
abstract = {The first absorption band in the photofragmentation spectroscopy of Sr +CO, is recorded in the energy region between 15600 and 16200 cm -1. The spectrum is characterized by a sharp peak between two zones with broad peaks. In contrast to this, the second absorption band observed in the energy interval of 19000-23000 cm-1 shows a regular vibrational structure accompanied by a low intensity shoulder which covers the energy up to the dissociation. Electronic multi-reference configuration interaction calculations in the 2-D nuclear configuration space with the CO bond frozen provide a qualitative explanation of the spectra. © 2003 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The first absorption band in the photofragmentation spectroscopy of Sr +CO, is recorded in the energy region between 15600 and 16200 cm -1. The spectrum is characterized by a sharp peak between two zones with broad peaks. In contrast to this, the second absorption band observed in the energy interval of 19000-23000 cm-1 shows a regular vibrational structure accompanied by a low intensity shoulder which covers the energy up to the dissociation. Electronic multi-reference configuration interaction calculations in the 2-D nuclear configuration space with the CO bond frozen provide a qualitative explanation of the spectra. © 2003 Elsevier B.V. All rights reserved.
Jakovljević, B; Stevanović, O; Bačić, G
Metastases to the breast from small-cell lung cancer: MR findings - A case report Journal Article
In: Acta Radiologica, vol. 44, no. 5, pp. 485-488, 2003.
@article{Jakovljević2003485,
title = {Metastases to the breast from small-cell lung cancer: MR findings - A case report},
author = {B Jakovljević and O Stevanović and G Bačić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0141755323&doi=10.1034%2fj.1600-0455.2003.00114.x&partnerID=40&md5=a2d288e90e310127ee5b21466459e85d},
doi = {10.1034/j.1600-0455.2003.00114.x},
year = {2003},
date = {2003-01-01},
journal = {Acta Radiologica},
volume = {44},
number = {5},
pages = {485-488},
abstract = {We report a case of blood-borne metastatic breast disease of small-cell lung cancer in a 44-year-old patient with no previous history of malignancy. The possibilities of MR in the early detection of breast metastases and their appearance on MR images are discussed. Metastases to the breast should be considered when MR mammography of the breast reveals multiple, bilateral, well-defined lesions with ring enhancement and wash-out pattern.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
We report a case of blood-borne metastatic breast disease of small-cell lung cancer in a 44-year-old patient with no previous history of malignancy. The possibilities of MR in the early detection of breast metastases and their appearance on MR images are discussed. Metastases to the breast should be considered when MR mammography of the breast reveals multiple, bilateral, well-defined lesions with ring enhancement and wash-out pattern.
Marković, J M Dimitrić; Ignjatović, L M; Marković, D A; Baranac, J M
Antioxidative capabilities of some organic acids and their co-pigments with malvin: Part II Journal Article
In: Journal of Electroanalytical Chemistry, vol. 553, no. SUPPL., pp. 177-182, 2003.
@article{DimitrićMarković2003177,
title = {Antioxidative capabilities of some organic acids and their co-pigments with malvin: Part II},
author = {J M Dimitrić Marković and L M Ignjatović and D A Marković and J M Baranac},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0042693022&doi=10.1016%2fS0022-0728%2803%2900320-6&partnerID=40&md5=fb2c430506b8235c2e03e2f359d9f8de},
doi = {10.1016/S0022-0728(03)00320-6},
year = {2003},
date = {2003-01-01},
journal = {Journal of Electroanalytical Chemistry},
volume = {553},
number = {SUPPL.},
pages = {177-182},
abstract = {Antioxidative properties of ferulic, sinapic, and tannic acids, and their co-pigment with an anthocyan molecule, malvin, were electrochemically observed by cyclic voltammetry. The values of oxidation potentials were used as a quantitative parameter in determining oxidation capabilities of the compounds. These values imply the following sequence of increasing antioxidative effect: ferulic acid
pubstate = {published},
tppubtype = {article}
}
Antioxidative properties of ferulic, sinapic, and tannic acids, and their co-pigment with an anthocyan molecule, malvin, were electrochemically observed by cyclic voltammetry. The values of oxidation potentials were used as a quantitative parameter in determining oxidation capabilities of the compounds. These values imply the following sequence of increasing antioxidative effect: ferulic acid<sinapic acid<tannic acid. Antioxidative capabilities of malvin co-pigments with the above acids are more pronounced in a buffer solution at pH 3.6 than in a solution at pH 2.5. The co-pigment malvin-ferulic acid oxidizes more easily than the other co-pigments of malvin with organic acids investigated. © 2003 Elsevier B.V. All rights reserved.
Marković, J M Dimitrić; Ignjatović, L M; Marković, D A; Baranac, J M
Antioxidative capabilities of some organic acids and their co-pigments with malvin: Part I Journal Article
In: Journal of Electroanalytical Chemistry, vol. 553, no. SUPPL., pp. 169-175, 2003.
@article{DimitrićMarković2003169,
title = {Antioxidative capabilities of some organic acids and their co-pigments with malvin: Part I},
author = {J M Dimitrić Marković and L M Ignjatović and D A Marković and J M Baranac},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0041691172&doi=10.1016%2fS0022-0728%2803%2900322-X&partnerID=40&md5=a62e67d2f0d516bf5b2196fb83684a2a},
doi = {10.1016/S0022-0728(03)00322-X},
year = {2003},
date = {2003-01-01},
journal = {Journal of Electroanalytical Chemistry},
volume = {553},
number = {SUPPL.},
pages = {169-175},
abstract = {Oxidation potentials of caffeic and chlorogenic acids, and their co-pigments with an anthocyan molecule, malvin, were measured by cyclic voltamemetry. It was found that these acids show electrochemical activity in a wide range of pH values of the supporting electrolyte, and that they undergo a similar mechanisms of electrode oxidation. The oxidation potential values indicated good antioxidative properties found with these acids. It was concluded that the antioxidative effect of molecules depend on the pH and on the structure, i.e. the number and position of hydroxyl groups in molecules, as well. The pK-values of the acids determined spectrophotometrically corresponded to pH ranges in which deprotonation processes influence the electrochemical mechanism. The co-pigments formed from malvin and the acids investigated showed better 'antioxidative properties' than pure malvin, but they were somewhat weaker than those for pure acids. © 2003 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Oxidation potentials of caffeic and chlorogenic acids, and their co-pigments with an anthocyan molecule, malvin, were measured by cyclic voltamemetry. It was found that these acids show electrochemical activity in a wide range of pH values of the supporting electrolyte, and that they undergo a similar mechanisms of electrode oxidation. The oxidation potential values indicated good antioxidative properties found with these acids. It was concluded that the antioxidative effect of molecules depend on the pH and on the structure, i.e. the number and position of hydroxyl groups in molecules, as well. The pK-values of the acids determined spectrophotometrically corresponded to pH ranges in which deprotonation processes influence the electrochemical mechanism. The co-pigments formed from malvin and the acids investigated showed better 'antioxidative properties' than pure malvin, but they were somewhat weaker than those for pure acids. © 2003 Elsevier B.V. All rights reserved.
Nikolić, N; Veselinović, D; Vučina, J; Lingeman, H; Karljiković-Rajić, K
Chiral ligand-exchange chromatography for diastereo-enantio separation of exametazime Journal Article
In: Journal of Pharmaceutical and Biomedical Analysis, vol. 32, no. 6, pp. 1159-1166, 2003.
@article{Nikolić20031159,
title = {Chiral ligand-exchange chromatography for diastereo-enantio separation of exametazime},
author = {N Nikolić and D Veselinović and J Vučina and H Lingeman and K Karljiković-Rajić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0043205804&doi=10.1016%2fS0731-7085%2803%2900230-9&partnerID=40&md5=98e233387ce541c321ab6232c6249892},
doi = {10.1016/S0731-7085(03)00230-9},
year = {2003},
date = {2003-01-01},
journal = {Journal of Pharmaceutical and Biomedical Analysis},
volume = {32},
number = {6},
pages = {1159-1166},
abstract = {The diastereo-enantio separation of isomeric mixtures of exametazime (HM-PAO) by liquid chromatography is described using an achiral sorbent (RP-18). A chiral eluent with the initial complex of Cu(II) and the optically active selector N,N-dimethyl-l-phenylalanine (l-DM-PhA), based on the ligand-exchange principle, has been applied. The separation is based on the presence of the immobilized binary complex Cu(l-DM-PhA)2 and formation of mixed ternary complex. The optimal mole ratio of Cu(II):l-DM-PhA is 1:4, the pH should be between 4.1 and 4.2 and up to 0.8 mM of triethylamine is added for column presaturation with the initial complex. The elution order has been defined using isolated l-HM-PAO via l-HM-PAO L(+)tartrate and meso-HM-PAO obtained by repeated recrystallization from the isomeric mixture of HM-PAO. Complete resolution between all isomers (RS from 2.14 to 3.91) and partial resolution for mesoEE/l-HM-PAO (RS=0.83) has been obtained. This means that the proposed chiral ligand-exchange chromatography (CLEC) can be used for determination of the isomeric purity of HM-PAO. This as an alternative method for resolution measurements with chiral columns. © 2003 Elsevier B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The diastereo-enantio separation of isomeric mixtures of exametazime (HM-PAO) by liquid chromatography is described using an achiral sorbent (RP-18). A chiral eluent with the initial complex of Cu(II) and the optically active selector N,N-dimethyl-l-phenylalanine (l-DM-PhA), based on the ligand-exchange principle, has been applied. The separation is based on the presence of the immobilized binary complex Cu(l-DM-PhA)2 and formation of mixed ternary complex. The optimal mole ratio of Cu(II):l-DM-PhA is 1:4, the pH should be between 4.1 and 4.2 and up to 0.8 mM of triethylamine is added for column presaturation with the initial complex. The elution order has been defined using isolated l-HM-PAO via l-HM-PAO L(+)tartrate and meso-HM-PAO obtained by repeated recrystallization from the isomeric mixture of HM-PAO. Complete resolution between all isomers (RS from 2.14 to 3.91) and partial resolution for mesoEE/l-HM-PAO (RS=0.83) has been obtained. This means that the proposed chiral ligand-exchange chromatography (CLEC) can be used for determination of the isomeric purity of HM-PAO. This as an alternative method for resolution measurements with chiral columns. © 2003 Elsevier B.V. All rights reserved.
Markovic, S; Dondur, V; Dimitrijevic, R
FTIR spectroscopy of framework aluminosilicate structures: Carnegieite and pure sodium nepheline Journal Article
In: Journal of Molecular Structure, vol. 654, no. 1-3, pp. 223-234, 2003.
@article{Markovic2003223,
title = {FTIR spectroscopy of framework aluminosilicate structures: Carnegieite and pure sodium nepheline},
author = {S Markovic and V Dondur and R Dimitrijevic},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0038510961&doi=10.1016%2fS0022-2860%2803%2900249-7&partnerID=40&md5=8b7e86db7978b785f1ea7fc4a06a3aca},
doi = {10.1016/S0022-2860(03)00249-7},
year = {2003},
date = {2003-01-01},
journal = {Journal of Molecular Structure},
volume = {654},
number = {1-3},
pages = {223-234},
abstract = {In this work the spectroscopic studies of polymorph transformation of framework silicates containing six-membered rings and different Si/Al ratio were carried out. Two model systems with different stoichiometries (Na-LTA, Si/Al = 1 and Na-FAU, Si/Al = 1.23) were investigated. Thermally induced phase transformations of initial zeolites resulted in forming of stuffed derivatives of cristobalite (carnegieite) and tridymite (nepheline). Powder XRD method was used for the recognition of new phases. All obtained phases have framework structures built by single six-membered rings. The changes of middle range order (rings symmetry), which take place during transformations of Na-LTA and Na-FAU into low-temperature camegieite, low-temperature camegieite into pure sodium (ps) nepheline as well as ps-nepheline into high-temperature camegieite, were investigated by IR spectroscopy. The rings symmetry is found to be dependent on a phase stoichiometry as well as on polymorph type. © 2003 Elsevier Science B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this work the spectroscopic studies of polymorph transformation of framework silicates containing six-membered rings and different Si/Al ratio were carried out. Two model systems with different stoichiometries (Na-LTA, Si/Al = 1 and Na-FAU, Si/Al = 1.23) were investigated. Thermally induced phase transformations of initial zeolites resulted in forming of stuffed derivatives of cristobalite (carnegieite) and tridymite (nepheline). Powder XRD method was used for the recognition of new phases. All obtained phases have framework structures built by single six-membered rings. The changes of middle range order (rings symmetry), which take place during transformations of Na-LTA and Na-FAU into low-temperature camegieite, low-temperature camegieite into pure sodium (ps) nepheline as well as ps-nepheline into high-temperature camegieite, were investigated by IR spectroscopy. The rings symmetry is found to be dependent on a phase stoichiometry as well as on polymorph type. © 2003 Elsevier Science B.V. All rights reserved.
Ristić, G S; Bogdanov, Z D; Zec, S; Romčević, N; Dohčević-Mitrović, Z; Miljanić, S S
Effect of the substrate material on diamond CVD coating properties Journal Article
In: Materials Chemistry and Physics, vol. 80, no. 2, pp. 529-536, 2003.
@article{Ristić2003529,
title = {Effect of the substrate material on diamond CVD coating properties},
author = {G S Ristić and Z D Bogdanov and S Zec and N Romčević and Z Dohčević-Mitrović and S S Miljanić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037467531&doi=10.1016%2fS0254-0584%2803%2900094-4&partnerID=40&md5=44e20424d9117f8ead0695c7014bd619},
doi = {10.1016/S0254-0584(03)00094-4},
year = {2003},
date = {2003-01-01},
journal = {Materials Chemistry and Physics},
volume = {80},
number = {2},
pages = {529-536},
abstract = {Diamond coatings were deposited onto different substrates (Cu, Si, WC-Co, Mo) by hot-filament chemical vapor deposition (CVD). Characterization of the obtained coatings was performed using scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis, Raman spectroscopy and Fourier transform infrared reflection (FTIR) spectroscopy. The results and observed differences are discussed from the aspect of the chemical nature of the substrate and its reactivity with a gaseous medium. © 2003 Elsevier Science B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Diamond coatings were deposited onto different substrates (Cu, Si, WC-Co, Mo) by hot-filament chemical vapor deposition (CVD). Characterization of the obtained coatings was performed using scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis, Raman spectroscopy and Fourier transform infrared reflection (FTIR) spectroscopy. The results and observed differences are discussed from the aspect of the chemical nature of the substrate and its reactivity with a gaseous medium. © 2003 Elsevier Science B.V. All rights reserved.
Stojić, D. Lj.; Marčeta, M P; Sovilj, S P; Miljanić, S S
Hydrogen generation from water electrolysis - Possibilities of energy saving Journal Article
In: Journal of Power Sources, vol. 118, no. 1-2, pp. 315-319, 2003.
@article{Stojić2003315,
title = {Hydrogen generation from water electrolysis - Possibilities of energy saving},
author = {D.Lj. Stojić and M P Marčeta and S P Sovilj and S S Miljanić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0038582373&doi=10.1016%2fS0378-7753%2803%2900077-6&partnerID=40&md5=3b6983e06e08f6793b52d88b1dcb8f96},
doi = {10.1016/S0378-7753(03)00077-6},
year = {2003},
date = {2003-01-01},
journal = {Journal of Power Sources},
volume = {118},
number = {1-2},
pages = {315-319},
abstract = {Hydrogen production via electrolysis of water from alkaline aqueous electrolytes is a well-established conventional technology. However, due to high energy requirements of about 4.5-5kWh/m n 3 H 2 in most industrial electrolysers, the cost of hydrogen produced in such a way is high. This is a limiting factor for the use of this method on a large scale, except in countries where the electricity is very cheap. There were various attempts to improve this process, like zero-gap cell geometry, development of new diaphragm materials, development of new electrocatalytic materials for electrodes, etc. We tried here to use ionic activators to reduce energy consumption. Two types of activators, both ethylenediamine complexes of cobalt, were used separately or in combination with some molybdates. The activation energies were significantly decreased in the presence of single ionic activators. However, the best results regarding the activation energy reduction were obtained when combinations with the molybdate were used. On the basis of the results of our experiments there is a strong indication that the activation with ionic activators reduces energy needs per mass unit of hydrogen produced for more than 10% in some cases, compared to those of non-activated electrolytes. © 2003 Elsevier Science B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Hydrogen production via electrolysis of water from alkaline aqueous electrolytes is a well-established conventional technology. However, due to high energy requirements of about 4.5-5kWh/m n 3 H 2 in most industrial electrolysers, the cost of hydrogen produced in such a way is high. This is a limiting factor for the use of this method on a large scale, except in countries where the electricity is very cheap. There were various attempts to improve this process, like zero-gap cell geometry, development of new diaphragm materials, development of new electrocatalytic materials for electrodes, etc. We tried here to use ionic activators to reduce energy consumption. Two types of activators, both ethylenediamine complexes of cobalt, were used separately or in combination with some molybdates. The activation energies were significantly decreased in the presence of single ionic activators. However, the best results regarding the activation energy reduction were obtained when combinations with the molybdate were used. On the basis of the results of our experiments there is a strong indication that the activation with ionic activators reduces energy needs per mass unit of hydrogen produced for more than 10% in some cases, compared to those of non-activated electrolytes. © 2003 Elsevier Science B.V. All rights reserved.
Perić, M; Stevanović, L
In: International Journal of Quantum Chemistry, vol. 92, no. 3, pp. 276-293, 2003.
@article{Perić2003276,
title = {Use of the normal coordinates in variational and perturbative ab initio handling of the vibronic and spin-orbit couplings in Π electronic states of linear tetra-atomic molecules},
author = {M Perić and L Stevanović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037420402&doi=10.1002%2fqua.10484&partnerID=40&md5=1cad3d9c99f31f1e22f8f4bc43004820},
doi = {10.1002/qua.10484},
year = {2003},
date = {2003-01-01},
journal = {International Journal of Quantum Chemistry},
volume = {92},
number = {3},
pages = {276-293},
abstract = {A variational and a perturbative approach are developed to handle the combined effect of the vibronic and spin-orbit couplings in Π electronic states of tetra-atomic molecules with linear equilibrium geometry. Both of them are based on the use of the normal vibrational bending coordinates. The perturbative treatment is carried out via two schemes for partition of the model Hamiltonian: In the first, the spin-orbit coupling term is treated as a perturbation; in the second, it is included in the zeroth-order Hamiltonian. It is demonstrated that both perturbative approaches lead to the same second-order formulae when the spin-orbit coupling constant is small compared to the bending frequency, but much larger than the splitting of potential surfaces upon bending. These approaches are used to calculate the vibronic and spin-orbit structure in the X 2 Π electronic state of HCCS by employing the ab initio-computed potential energy surfaces. Complete numerical equivalence of the results obtained with the present variational approach and those generated by the algorithms employing internal vibrational coordinates is demonstrated. The restrictions concerning the applicability of the perturbative approaches are discussed in terms of the agreement between the results obtained by means of them with those generated in the corresponding variational computations. The general reliability of the model employed is checked by comparing the theoretical results with the available experimental data.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A variational and a perturbative approach are developed to handle the combined effect of the vibronic and spin-orbit couplings in Π electronic states of tetra-atomic molecules with linear equilibrium geometry. Both of them are based on the use of the normal vibrational bending coordinates. The perturbative treatment is carried out via two schemes for partition of the model Hamiltonian: In the first, the spin-orbit coupling term is treated as a perturbation; in the second, it is included in the zeroth-order Hamiltonian. It is demonstrated that both perturbative approaches lead to the same second-order formulae when the spin-orbit coupling constant is small compared to the bending frequency, but much larger than the splitting of potential surfaces upon bending. These approaches are used to calculate the vibronic and spin-orbit structure in the X 2 Π electronic state of HCCS by employing the ab initio-computed potential energy surfaces. Complete numerical equivalence of the results obtained with the present variational approach and those generated by the algorithms employing internal vibrational coordinates is demonstrated. The restrictions concerning the applicability of the perturbative approaches are discussed in terms of the agreement between the results obtained by means of them with those generated in the corresponding variational computations. The general reliability of the model employed is checked by comparing the theoretical results with the available experimental data.
Grgurić-Šipka, S R; Sabo, T J; Trifunović, S R; Minić, D M
Investigation of thermal stability and kinetics of thermal degradation of meridional isomers of aminocarboxylato cobalt(III) complexes Journal Article
In: Thermochimica Acta, vol. 399, no. 1-2, pp. 145-152, 2003.
@article{Grgurić-Šipka2003145,
title = {Investigation of thermal stability and kinetics of thermal degradation of meridional isomers of aminocarboxylato cobalt(III) complexes},
author = {S R Grgurić-Šipka and T J Sabo and S R Trifunović and D M Minić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037463903&doi=10.1016%2fS0040-6031%2802%2900458-6&partnerID=40&md5=9b8d93d9b77236a11defbe0b07493f3c},
doi = {10.1016/S0040-6031(02)00458-6},
year = {2003},
date = {2003-01-01},
journal = {Thermochimica Acta},
volume = {399},
number = {1-2},
pages = {145-152},
abstract = {The thermal properties of some mixed complexes of cobalt(III) containing tetradentate ethylenediamine-N,N′-di-3-propionate (eddp) ligand and several amino acids were investigated by thermogravimetry (TG) and differential scanning calorimetry (DSC). The thermal stability derived from decomposition temperatures was discussed in terms of amino acid present. It was shown that the processes of thermal decomposition of these complexes are multi-step degradation processes. Some of these can be separated into individual steps. The corresponding kinetic and thermodynamic parameters of these processes were determined, and the possible mechanisms were discussed. © 2002 Elsevier Science B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The thermal properties of some mixed complexes of cobalt(III) containing tetradentate ethylenediamine-N,N′-di-3-propionate (eddp) ligand and several amino acids were investigated by thermogravimetry (TG) and differential scanning calorimetry (DSC). The thermal stability derived from decomposition temperatures was discussed in terms of amino acid present. It was shown that the processes of thermal decomposition of these complexes are multi-step degradation processes. Some of these can be separated into individual steps. The corresponding kinetic and thermodynamic parameters of these processes were determined, and the possible mechanisms were discussed. © 2002 Elsevier Science B.V. All rights reserved.
Perić, M; Mladenović, M; Tomić, K; Marian, C M
Ab initio study of the vibronic and spin-orbit structure in the X2Π electronic state of CCCH Journal Article
In: Journal of Chemical Physics, vol. 118, no. 10, pp. 4444-4451, 2003.
@article{Perić20034444,
title = {Ab initio study of the vibronic and spin-orbit structure in the X2Π electronic state of CCCH},
author = {M Perić and M Mladenović and K Tomić and C M Marian},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037426133&doi=10.1063%2f1.1543155&partnerID=40&md5=6c196d249890546fe8ee32aabfddba80},
doi = {10.1063/1.1543155},
year = {2003},
date = {2003-01-01},
journal = {Journal of Chemical Physics},
volume = {118},
number = {10},
pages = {4444-4451},
abstract = {In the framework of ab initio study, the vibronic and spin-orbit couplings in the X2Π electronic state of the CCCH radical were considered. The values for various spectroscopic parameters computed agree satisfactorily with the results of previous experimental and theoretical works. Calculation results explain why the measured spin-orbit splitting in the lowest-lying vibronic species is approximately equal to half the value of the spin-orbit coupling constant.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In the framework of ab initio study, the vibronic and spin-orbit couplings in the X2Π electronic state of the CCCH radical were considered. The values for various spectroscopic parameters computed agree satisfactorily with the results of previous experimental and theoretical works. Calculation results explain why the measured spin-orbit splitting in the lowest-lying vibronic species is approximately equal to half the value of the spin-orbit coupling constant.
Jugović, D; Cvjetićanin, N; Kusigerski, V; Mentus, S
Synthesis of LiMn2O4 by glycine-nitrate method Journal Article
In: Journal of Optoelectronics and Advanced Materials, vol. 5, no. 1, pp. 343-346, 2003.
@article{Jugović2003343,
title = {Synthesis of LiMn2O4 by glycine-nitrate method},
author = {D Jugović and N Cvjetićanin and V Kusigerski and S Mentus},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0346965192&partnerID=40&md5=9f8f62a974aa54abaebdb38a7a028721},
year = {2003},
date = {2003-01-01},
journal = {Journal of Optoelectronics and Advanced Materials},
volume = {5},
number = {1},
pages = {343-346},
abstract = {Glycine-nitrate method was used to synthesize lithium manganese oxides. For the molar ratio of lithium-to-manganese in precursor solution equal to 1:2 spinel LiMn2O4 was obtained. For molar ratio of 1:1 a mixture of Li2MnO3 and spinel phase different from LiMn2O4 was observed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Glycine-nitrate method was used to synthesize lithium manganese oxides. For the molar ratio of lithium-to-manganese in precursor solution equal to 1:2 spinel LiMn2O4 was obtained. For molar ratio of 1:1 a mixture of Li2MnO3 and spinel phase different from LiMn2O4 was observed.
Kuzmanović, M M; Pavlović, M S; Savović, J J; Marinković, M
Temporal responses of spectral line intensities emitted by d.c. arc plasma with aerosol supply studied by power interruption technique Journal Article
In: Spectrochimica Acta - Part B Atomic Spectroscopy, vol. 58, no. 2, pp. 239-248, 2003.
@article{Kuzmanović2003239,
title = {Temporal responses of spectral line intensities emitted by d.c. arc plasma with aerosol supply studied by power interruption technique},
author = {M M Kuzmanović and M S Pavlović and J J Savović and M Marinković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037415645&doi=10.1016%2fS0584-8547%2802%2900256-2&partnerID=40&md5=79dda1cef25e3c08644fb302e99759ca},
doi = {10.1016/S0584-8547(02)00256-2},
year = {2003},
date = {2003-01-01},
journal = {Spectrochimica Acta - Part B Atomic Spectroscopy},
volume = {58},
number = {2},
pages = {239-248},
abstract = {The responses to the fast interruption of the arc current have been studied for the spectral line intensities of several elements emitted by U-shaped direct current (d.c.) arc plasma with aerosol supply. The arc was burned at atmospheric pressure. Solutions containing the investigated elements were introduced with a concentric glass nebulizer into the argon stream of 2.7 lmin -1 . The arc current of 6 A was interrupted in periods that lasted up to 200 μs. At the moment of power interruption, the spectral line intensities are either suddenly increased indicating Saha balance or suddenly decreased indicating Boltzmann balance. Plots of intensity vs. time are used to evaluate the mechanisms that maintain the populations of excited states in the stationary state and processes occurring in the plasma during the power-off period. Excited levels of the elements with high ionization energies, like Ar, H and O, are predominantly populated by three-body recombination process i.e. they are controlled by the Saha balance. Excited levels of elements with medium ionization energies are predominantly populated by collisions with electrons i.e. controlled by the Boltzmann balance. Some of the spectral lines of C, P and Hg with high-excited levels missed the sudden intensity change, a cooling jump, which could be interpreted by the presence of two opposite mechanisms, Saha and Boltzmann balances, that cancel out the effect. Spectral line responses of easily ionized elements were found to depend on the plasma region. In a 2-mm axis region, the intensities do not show a cooling jump, but increase slowly during the power-off period. At medium distances from the arc axis, the spectral lines show typical Boltzmann type response. Farther to the arc periphery, where the electron concentration is very low but emission is still high, the power interruption does not influence the intensities and this indicates that the excitation is not prevailed by electron collisions. © 2002 Elsevier Science B.V. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The responses to the fast interruption of the arc current have been studied for the spectral line intensities of several elements emitted by U-shaped direct current (d.c.) arc plasma with aerosol supply. The arc was burned at atmospheric pressure. Solutions containing the investigated elements were introduced with a concentric glass nebulizer into the argon stream of 2.7 lmin -1 . The arc current of 6 A was interrupted in periods that lasted up to 200 μs. At the moment of power interruption, the spectral line intensities are either suddenly increased indicating Saha balance or suddenly decreased indicating Boltzmann balance. Plots of intensity vs. time are used to evaluate the mechanisms that maintain the populations of excited states in the stationary state and processes occurring in the plasma during the power-off period. Excited levels of the elements with high ionization energies, like Ar, H and O, are predominantly populated by three-body recombination process i.e. they are controlled by the Saha balance. Excited levels of elements with medium ionization energies are predominantly populated by collisions with electrons i.e. controlled by the Boltzmann balance. Some of the spectral lines of C, P and Hg with high-excited levels missed the sudden intensity change, a cooling jump, which could be interpreted by the presence of two opposite mechanisms, Saha and Boltzmann balances, that cancel out the effect. Spectral line responses of easily ionized elements were found to depend on the plasma region. In a 2-mm axis region, the intensities do not show a cooling jump, but increase slowly during the power-off period. At medium distances from the arc axis, the spectral lines show typical Boltzmann type response. Farther to the arc periphery, where the electron concentration is very low but emission is still high, the power interruption does not influence the intensities and this indicates that the excitation is not prevailed by electron collisions. © 2002 Elsevier Science B.V. All rights reserved.
Micic, M; Radotic, K; Jeremic, M; Leblanc, R M
Study of self-assembly of the lignin model compound on cellulose model substrate Journal Article
In: Macromolecular Bioscience, vol. 3, no. 2, pp. 100-106, 2003.
@article{Micic2003100,
title = {Study of self-assembly of the lignin model compound on cellulose model substrate},
author = {M Micic and K Radotic and M Jeremic and R M Leblanc},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037542924&doi=10.1002%2fmabi.200390011&partnerID=40&md5=e5bf781720f8fc07ad4d35eed6bf2969},
doi = {10.1002/mabi.200390011},
year = {2003},
date = {2003-01-01},
journal = {Macromolecular Bioscience},
volume = {3},
number = {2},
pages = {100-106},
abstract = {Herein we report a topographical study of the supramolecular organization of enzymatically polymerized lignin model compound - dehydrogenative polymer (DHP) of coniferyl alcohol - on cellulose substrate, using the Environmental Scanning Electron Microscopic (ESEM) technique. A comparison of deposits obtained by bulk polymerization in solution and direct polymerization in the presence of cellulose substrate shows distinct differences in supramolecular organization. DHP polymerized in solution expresses a 3-D structure with short-range ordered motifs, while the polymer formed in the presence of cellulose substrate arranges in a single layer compact structure consisting of several domains. Such structures could be described as a two-dimensional hexagonal close packed lattice(HCPL), with the dimension of unit cell in 1 μm range. The domains have a quite regular structure with few lattice defect forming a good example of two-dimensional colloidal crystal. The growth of DHP globules and their assembly into a supramolecular structures are interpreted in terms of cooperative electrostatic interaction of polymer precursors, with a framework of cellulose OH groups and interfacial interactions (hydrophilic/hydrophobic) in the course of the structure growth. The results strongly suggest that the carbohydrate matrix in plant cells can serve as a templates for lignin structure formation in the plant cell wall.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Herein we report a topographical study of the supramolecular organization of enzymatically polymerized lignin model compound - dehydrogenative polymer (DHP) of coniferyl alcohol - on cellulose substrate, using the Environmental Scanning Electron Microscopic (ESEM) technique. A comparison of deposits obtained by bulk polymerization in solution and direct polymerization in the presence of cellulose substrate shows distinct differences in supramolecular organization. DHP polymerized in solution expresses a 3-D structure with short-range ordered motifs, while the polymer formed in the presence of cellulose substrate arranges in a single layer compact structure consisting of several domains. Such structures could be described as a two-dimensional hexagonal close packed lattice(HCPL), with the dimension of unit cell in 1 μm range. The domains have a quite regular structure with few lattice defect forming a good example of two-dimensional colloidal crystal. The growth of DHP globules and their assembly into a supramolecular structures are interpreted in terms of cooperative electrostatic interaction of polymer precursors, with a framework of cellulose OH groups and interfacial interactions (hydrophilic/hydrophobic) in the course of the structure growth. The results strongly suggest that the carbohydrate matrix in plant cells can serve as a templates for lignin structure formation in the plant cell wall.
Ćiric-Marjanović, G; Cvjetićanin, N; Mentus, S
Electrochemical synthesis and structure of poly(2-methyl-1-naphthylamine) films Journal Article
In: Spectroscopy Letters, vol. 36, no. 1-2, pp. 151-165, 2003.
@article{Ćiric-Marjanović2003151,
title = {Electrochemical synthesis and structure of poly(2-methyl-1-naphthylamine) films},
author = {G Ćiric-Marjanović and N Cvjetićanin and S Mentus},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037639753&doi=10.1081%2fSL-120021784&partnerID=40&md5=923c7cb31b54801a7bd68723a921c2ff},
doi = {10.1081/SL-120021784},
year = {2003},
date = {2003-01-01},
journal = {Spectroscopy Letters},
volume = {36},
number = {1-2},
pages = {151-165},
abstract = {A novel polymer, poly(2-methyl-1-naphthylamine), which was synthesized electrochemically at various temperatures from a solution containing 2-methyl-1-naphthylamine, acetic acid and sodium acetate, was characterized by IR spectroscopy. The structural conclusions were based on comparisons of polymer spectra with the IR-spectrum of the monomer, 2-methyl-1-naphthylamine. IR spectroscopy indicates that the electropolymerization proceeds via the -NH 2 groups and that the poly(2- methyl-1-naphthylamine) structure consists of imine (-N=C) and amine (-NH-C) links between naphthalene rings as well as a free methyl groups in the chains. An analysis of the "substitution pattern" region in the polymer's spectra suggests that the polymer molecules were formed via mixed N-C(4), N-C(5) and N-C(7) linkages between repeated units. The ratio of between the 1645 and 1620 cm -1 peak areas decreases with increased temperature during synthesis, indicating that 25°C is the best temperature to obtain higher molecular weights.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A novel polymer, poly(2-methyl-1-naphthylamine), which was synthesized electrochemically at various temperatures from a solution containing 2-methyl-1-naphthylamine, acetic acid and sodium acetate, was characterized by IR spectroscopy. The structural conclusions were based on comparisons of polymer spectra with the IR-spectrum of the monomer, 2-methyl-1-naphthylamine. IR spectroscopy indicates that the electropolymerization proceeds via the -NH 2 groups and that the poly(2- methyl-1-naphthylamine) structure consists of imine (-N=C) and amine (-NH-C) links between naphthalene rings as well as a free methyl groups in the chains. An analysis of the "substitution pattern" region in the polymer's spectra suggests that the polymer molecules were formed via mixed N-C(4), N-C(5) and N-C(7) linkages between repeated units. The ratio of between the 1645 and 1620 cm -1 peak areas decreases with increased temperature during synthesis, indicating that 25°C is the best temperature to obtain higher molecular weights.
Radić-Perić, J; Pantelić, N
Thermodynamical modeling of silicon carbide synthesis in thermal plasma Journal Article
In: Journal of Thermal Analysis and Calorimetry, vol. 72, no. 1, pp. 35-45, 2003.
@article{Radić-Perić200335,
title = {Thermodynamical modeling of silicon carbide synthesis in thermal plasma},
author = {J Radić-Perić and N Pantelić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0038727269&doi=10.1023%2fA%3a1023943030263&partnerID=40&md5=a12536520b8b145e25979ee80ced1930},
doi = {10.1023/A:1023943030263},
year = {2003},
date = {2003-01-01},
journal = {Journal of Thermal Analysis and Calorimetry},
volume = {72},
number = {1},
pages = {35-45},
abstract = {The synthesis process of solid SiC in thermal plasma was investigated theoretically by computing the equilibrium composition of the gas mixtures involving silicon and carbon in the presence of argon and hydrogen at various silicon/carbon amounts and at two different total pressures in the system, in the temperature range between 1000 and 6000 K. Use is made of the fact that a thermal plasma, by definition, is a plasma in (local) thermodynamical equilibrium, which makes possible the theoretical determination of its equilibrium composition at definite temperature by employing Gibbs free energy data for the compounds present in the system. From the calculated compositions of the investigated gas systems the temperature-composition phase diagrams were obtained. Using these data the temperature zones with saturated and/or oversaturated vapour of SiC as well as of Si and C were determined and the possibility of the formation of SiC in the solid state via different reaction routes was analyzed.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The synthesis process of solid SiC in thermal plasma was investigated theoretically by computing the equilibrium composition of the gas mixtures involving silicon and carbon in the presence of argon and hydrogen at various silicon/carbon amounts and at two different total pressures in the system, in the temperature range between 1000 and 6000 K. Use is made of the fact that a thermal plasma, by definition, is a plasma in (local) thermodynamical equilibrium, which makes possible the theoretical determination of its equilibrium composition at definite temperature by employing Gibbs free energy data for the compounds present in the system. From the calculated compositions of the investigated gas systems the temperature-composition phase diagrams were obtained. Using these data the temperature zones with saturated and/or oversaturated vapour of SiC as well as of Si and C were determined and the possibility of the formation of SiC in the solid state via different reaction routes was analyzed.
Jerosimić, S; Perić, M
Use of the group theory for classification of electronic states of acetylene Journal Article
In: Journal of the Serbian Chemical Society, vol. 68, no. 4-5, pp. 363-381, 2003.
@article{Jerosimić2003363,
title = {Use of the group theory for classification of electronic states of acetylene},
author = {S Jerosimić and M Perić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0038173392&doi=10.2298%2fJSC0305363J&partnerID=40&md5=040465d8adae831da1b86784cf7f08a4},
doi = {10.2298/JSC0305363J},
year = {2003},
date = {2003-01-01},
journal = {Journal of the Serbian Chemical Society},
volume = {68},
number = {4-5},
pages = {363-381},
abstract = {The electronic states of the acetylene molecule are classified employing the group theory combined with the use of the Walsh diagrams and some elementary quantum chemical considerations. The results of this analysis are compared with those obtained by explicit ab initio calculations. It is shown that the global structure of the electronic spectrum can be reproduced predicted without carrying out detailed ab initio calculations.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The electronic states of the acetylene molecule are classified employing the group theory combined with the use of the Walsh diagrams and some elementary quantum chemical considerations. The results of this analysis are compared with those obtained by explicit ab initio calculations. It is shown that the global structure of the electronic spectrum can be reproduced predicted without carrying out detailed ab initio calculations.
Kuzmanović, M M; Antić-Jovanović, A; Stoiljković, M; Pavlović, M S; Marinković, M
In: Spectroscopy Letters, vol. 36, no. 4, pp. 303-312, 2003.
@article{Kuzmanović2003303,
title = {A power interruption technique for determining the difference between electron and gas temperatures in the argon d.c. arc supplied with aqueous aerosol},
author = {M M Kuzmanović and A Antić-Jovanović and M Stoiljković and M S Pavlović and M Marinković},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0141841696&doi=10.1081%2fSL-120024580&partnerID=40&md5=b63eee5166707ef33a2a9bea783192c3},
doi = {10.1081/SL-120024580},
year = {2003},
date = {2003-01-01},
journal = {Spectroscopy Letters},
volume = {36},
number = {4},
pages = {303-312},
abstract = {The difference between electron and gas temperatures in a low current U-shaped d.c. arc with aqueous aerosol supply was studied using a power interruption technique. Monitoring of the temporal evolution of recombination continuum after power switch-off revealed that it was necessary to do a correction of the measured values due to a change in electron concentration. It was shown that the plasma studied was a two temperature type and that the temperature difference ranges from 1850 K to 600 K for arc currents from 3 to 10.5 A, respectively. A comparison with literature results for pure argon arc plasma shows that aerosol introduction reduces the temperature difference.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The difference between electron and gas temperatures in a low current U-shaped d.c. arc with aqueous aerosol supply was studied using a power interruption technique. Monitoring of the temporal evolution of recombination continuum after power switch-off revealed that it was necessary to do a correction of the measured values due to a change in electron concentration. It was shown that the plasma studied was a two temperature type and that the temperature difference ranges from 1850 K to 600 K for arc currents from 3 to 10.5 A, respectively. A comparison with literature results for pure argon arc plasma shows that aerosol introduction reduces the temperature difference.
Bojović, V; Antić-Jovanović, A; Pešić, D; Isailović, D; Kuzmanović, M
Vibrational Analysis of the β System of 10 B 18 O Journal Article
In: Spectroscopy Letters, vol. 36, no. 5-6, pp. 531-536, 2003.
@article{Bojović2003531,
title = {Vibrational Analysis of the β System of 10 B 18 O},
author = {V Bojović and A Antić-Jovanović and D Pešić and D Isailović and M Kuzmanović},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0347381012&doi=10.1081%2fSL-120026638&partnerID=40&md5=dd418f579764cd0c4ba89ec1a7f408b9},
doi = {10.1081/SL-120026638},
year = {2003},
date = {2003-01-01},
journal = {Spectroscopy Letters},
volume = {36},
number = {5-6},
pages = {531-536},
abstract = {Ten bands of the β system (B 2 Σ + - X 2 Σ + ) of the 10 B 18 O molecule have been observed for the first time. The spectrum was obtained by emission spectroscopy from a low-pressure arc, at medium dispersion, and vibrationally analyzed using isotope shift measurements. Vibrational analysis gave the constants ω e and ω e X e for both electronic states involved in the transitions.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Ten bands of the β system (B 2 Σ + - X 2 Σ + ) of the 10 B 18 O molecule have been observed for the first time. The spectrum was obtained by emission spectroscopy from a low-pressure arc, at medium dispersion, and vibrationally analyzed using isotope shift measurements. Vibrational analysis gave the constants ω e and ω e X e for both electronic states involved in the transitions.
Pejić, N; Anić, S; Kuntić, V; Vukojević, V; Kolar-Anić, L
Kinetic Determination of Microquantities of Rutin by Perturbation of the Bray-Liebhafsky Oscillatory Reaction in an Open System Journal Article
In: Microchimica Acta, vol. 143, no. 4, pp. 261-267, 2003.
@article{Pejić2003261,
title = {Kinetic Determination of Microquantities of Rutin by Perturbation of the Bray-Liebhafsky Oscillatory Reaction in an Open System},
author = {N Pejić and S Anić and V Kuntić and V Vukojević and L Kolar-Anić},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-1542343915&doi=10.1007%2fs00604-003-0071-8&partnerID=40&md5=a3962926c688336cbf0f35fd9effebe4},
doi = {10.1007/s00604-003-0071-8},
year = {2003},
date = {2003-01-01},
journal = {Microchimica Acta},
volume = {143},
number = {4},
pages = {261-267},
abstract = {A kinetic method is described for the microquantitative (microconcentration/microvolume) determination of rutin based on potentiometric monitoring of the concentration perturbations of the Bray-Liebhafsky (BL) oscillatory reaction being in a non-equilibrium stationary state close to a bifurcation point. The experiments are carried out in an open reactor. The response of the matrix system to perturbations by different concentrations of rutin ethanolic solutions is followed by a Pt-electrode. In the concentration range between 7.8 × 10 -8 mol dm -3 and 9.1 × 10 -6 mol dm -3 , we found a linear dependence of the maximal potential shift, ΔE m , on the logarithm of the rutin concentrations. The unknown concentrations can be determined from the calibration curve up to an accuracy of ±5%. The detection limit is 3.6 × 10 -8 mol dm -3 . The amount of required sample can be as small as 10 μL.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A kinetic method is described for the microquantitative (microconcentration/microvolume) determination of rutin based on potentiometric monitoring of the concentration perturbations of the Bray-Liebhafsky (BL) oscillatory reaction being in a non-equilibrium stationary state close to a bifurcation point. The experiments are carried out in an open reactor. The response of the matrix system to perturbations by different concentrations of rutin ethanolic solutions is followed by a Pt-electrode. In the concentration range between 7.8 × 10 -8 mol dm -3 and 9.1 × 10 -6 mol dm -3 , we found a linear dependence of the maximal potential shift, ΔE m , on the logarithm of the rutin concentrations. The unknown concentrations can be determined from the calibration curve up to an accuracy of ±5%. The detection limit is 3.6 × 10 -8 mol dm -3 . The amount of required sample can be as small as 10 μL.