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Search Results: 1 - 10 of 191627 matches for " Maksin Danijela D. "
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Kinetic modeling of heavy metal sorption by vinyl pyridine based copolymer
Maksin Danijela D.,Kljajevi? Sla?ana O.,?oli? Maja B.,Markovi? Jelena P.
Hemijska Industrija , 2012, DOI: 10.2298/hemind121002112m
Abstract: Commercial macroporous poly(4-vinylpyridine-co-divinylbenzene) [P4VPD], known as REILLEX-425 was characterized by mercury porosimetry, nitrogen physisorption, Fourier transformed infrared (FTIR) spectroscopy and elemental analysis. Sorption rates of P4VPD for Cu(II), Co(II) and Cr(VI) ions were determined in static non-competitive experiments, at room temperature (298 K). Rapid sorption was observed, especially for Co(II), with half time, t1/2, of 1.5 min and high experimental maximal capacity, Qmax, of 3.08 mmol g-1. Four kinetic models (pseudo-first and pseudo-second order model, intraparticle diffusion and Boyd model) were used for analyzing metal sorption by P4VPD. Metal ions sorption is well represented by the pseudo-second-order model, with definite influence of pore and film diffusion on sorption rates. [Projekat Ministarstva nauke Republike Srbije, br. III43009]
Sustainable heritage utilization in rural tourism development in Serbia
Maksin Marija
Spatium , 2012, DOI: 10.2298/spat1228037m
Abstract: Research on natural and cultural heritage as one of the key levers of sustainable tourism development in Serbia has been conducted 2010, for the elaboration of the Master plan for Sustainable Rural Tourism Development in Serbia. To evaluate achieved and potential attractiveness of natural and cultural heritage at rural Serbia the FAS methodology was implemented, and the results of this evaluation are discussed. Based on achieved and potential attractiveness and accessibility of natural and cultural heritage, and other criteria, the rural tourism clusters have been established. Methodology for rural tourism clusters identification and prioritization is presented, and the results of prioritization discussed. Elaboration of the Master plan for Sustainable Rural Tourism Development in Serbia has been based on the holistic approach. Therefore the aim of rural tourism development is to protect, revitalize and use the natural and cultural assets in sustainable way to benefit the rural communities. Challenges and possibilities for sustainable heritage utilization, sustainable rural tourism development, and management arrangements are discussed for two cases - Viminacium archaeological park and Mountain Stara planina Nature Park. Based on analyzed cases the evaluation criteria for management of sustainable heritage utilization and rural tourism development are proposed.
Crucial European and international strategic documents for guiding the spatial development of the Danube region in Serbia
Maksin Marija
Spatium , 2011, DOI: 10.2298/spat1126033m
Abstract: Corridor VII, the Danube development belt and the Danube River Basin represent a basis for the development of Serbia’s spatial, economic, social and cultural relations with the Danube countries and the implementation of the European strategic documents concerning the management of the sustainable spatial development of the Danube Region. Therefore, this paper analyzes the implementation approaches, priority areas, actions and instruments determined by the relevant European and international strategic documents for the Danube, and the umbrella European document for all Danube countries - European Union Strategy for the Danube Region. The implementation of an integrated approach, strategic framework, obligations and recommendations determined by the analyzed European and international strategic documents and conventions is especially important for improving the management of the spatial development of the Danube Region and Serbia as a whole. From that aspect, the paper recommends the necessary activities and facilities for harmonizing our strategic planning and management system and practice with the analyzed European documents concerning the Danube and Danube Region.
Challenges, responses and partnership for achieving sustainable tourism and heritage preservation
Maksin Marija
Spatium , 2010, DOI: 10.2298/spat1022011m
Abstract: The process of globalization has created the situation where the expectations of tourists are the same both with respect to the quality of services in all destinations and with respect to the authencity based on local attractions and experiences, which should be unique and different for each destination. The key element in maintaining destination attractiveness is the protection and presentation of natural and cultural heritage and its sustainable utilization for tourism development. The sustainability concept is of equal importance for long-term tourism development, destination competitiveness and heritage protection. The paper deals with the main challenges to achieving sustainable tourism and points to some key responses to them. Participation, cooperation and partnership should be a vital prerequisite for the implementation and performance of sustainable tourism and heritage protection. This attitude has been tested on several examples of good practice in heritage protection and the sustainable development of tourism destinations in Serbia. .
Transition from Townsend to glow discharge: subcritical, mixed or supercritical
Danijela D. Sijacic,Ute Ebert
Physics , 2002, DOI: 10.1103/PhysRevE.66.066410
Abstract: The full parameter space of the transition from Townsend to glow discharge is investigated numerically in one space dimension in the classical model: with electrons and positive ions drifting in the local electric field, impact ionization by electrons ($\alpha$ process), secondary electron emission from the cathode ($\gamma$ process) and space charge effects. We also perform a systematic analytical small current expansion about the Townsend limit up to third order in the total current that fits our numerical data very well. Depending on $\gamma$ and system size pd, the transition from Townsend to glow discharge can show the textbook subcritical behavior, but for smaller values of pd, we also find supercritical or some intermediate ``mixed'' behavior. The analysis in particular lays the basis for understanding the complex spatio-temporal patterns in planar barrier discharge systems.
The synthesis and characterization of facial and meridional isomers of uns-cis-(ethylenediamine-N-N -di-3-propionato) cobalt(III) complexes with S-lysine and S-histidine
Journal of the Serbian Chemical Society , 2002,
Abstract: In the reaction of sodium uns-cis-(ethylenediamine-N-N -di-3-propionato)-(carbonato)cobaltate(III) dihydrate and the corresponding amino acid (S-lysine or S-histidine) at 70"C, both the theoretically possible facial and meridional isomers of the uns-cis-(ethylenediamine-N-N -di-3-propionato)(aminoacidato)cobalt(III) complexes were prepared. The complexes were isolated chromatographically and characterized by elemental analyses, as well as by electron absorption and infrared spectroscopy.
Period doubling in glow discharges: local versus global differential conductivity
Danijela D. Sijacic,Ute Ebert,Ismail Rafatov
Physics , 2003, DOI: 10.1103/PhysRevE.70.056220
Abstract: Short planar glow discharges coupled to a resistive layer exhibit a wealth of spontaneous spatio-temporal patterns. Several authors have suggested effective reaction-diffusion-models to explore similarities with other pattern forming systems. To test these effective models, we here investigate the temporal oscillations of a glow discharge layer coupled to a linear resistor. We find an unexpected cascade of period doubling events. This shows that the inner structure of the discharge is more complex than can be described by a reaction-diffusion-model with negative differential conductivity.
Oscillations in DC driven "barrier" discharges: numerical solutions, stability analysis and phase diagram
Danijela D. Sijacic,Ute Ebert,Ismail Rafatov
Physics , 2004, DOI: 10.1103/PhysRevE.71.066402
Abstract: A short gas discharge layer sandwiched with a semiconductor layer between planar electrodes shows a variety of spatio-temporal patterns. The paper focusses on the spatially homogeneous spontaneous oscillations while a DC voltage is applied; the results on these homogeneous oscillations apply equally to a planar discharge in series with any resistor with capacitance. We define the minimal model, identify its independent dimensionless parameters and then present results of the full time-dependent numerical solutions of the model as well as of a linear stability analysis of the stationary state. Full numerical solutions and the results of the stability analysis agree very well. The stability analysis is then used for calculating bifurcation diagrams. We find semi-quantitative agreement with experiment for the diagram of bifurcations from stationary to oscillating solutions as well as for amplitude and frequency of the developing limit cycle oscillations.
Some problems of integrating the landscape planning into the spatial and environmental planning in Serbia
Mici?-Maksin Marija
Spatium , 2003, DOI: 10.2298/spat0309028m
Abstract: A short review has been given of Serbian spatial and environmental planning, and in particular of relevant legislation. Attention has been paid to the landscape treatment within legislative grounds, and correspondingly in planning practice. Few assumptions have been made, upon the lack of methodological and integrated approach to the landscape protection and management. Strategic plans (spatial and town master plans), sectoral plans and policies (for soil, forestry etc) have been reviewed in attempt to verify the stated assumptions. The problems of landscape and open green space protection and maintenance have been brought up. In reference to the EU recommendations, legislation and instruments have been investigated regarding the entrenchment of the landscape concept and landscape planning into the spatial, environmental and related sectoral planning. Prior to the landscape concept implementation is the survey and establishment of regional landscape diversification so as to differentiate regional approaches to landscape planning.
The role of higher thoracic irradiation doses in patients with limited stage of small-cell lung cancer: Retrospective study
??epanovi? Danijela D.,Baji? Nada D.,?ivkovi? Danko,Mijovi? Milan
Archive of Oncology , 2010, DOI: 10.2298/aoo1002008s
Abstract: Background: Small-cell lung cancer is highly chemo- and radiosensitive tumor. We evaluated two different radiotherapy doses applied sequentially with chemotherapy in relation to time to progression, progression free survival, and overall survival in patients with limited disease of small cell lung cancer. Methods: From 1998 to 2003, 81 patients were treated for small-cell lung carcinoma. Median age was 57 years (range, 36-77 years) and female: male ratio was 1:4. Patients were initially treated with four cycles of chemotherapy during three weeks (cisplatin 80mg/m2 IV, day 1 and etoposide 100 mg/m2 IV, days 1 - 3). One month later, patients received up to 44 Gy, 2 Gy per day, 5 days per week (group I, 41 patients) or above 44 Gy, standard fractionation (group II, 40 patients), to mediastinum and tumor. Range of higher radiotherapy doses was 54 Gy to 64 Gy, standard fractionation. We evaluated if different radiotherapy doses had any influence on time to progression, progression free survival, and overall survival. Results: The median follow up time was 23 months (range, 12-72 months) for both groups of patients (81). The median time to progression in group I of patients (41) was 13 months (range, 11-29 months) while median time to progression in group II of patients (40) was 20 months (min=9, max=60). There was no statistically significant difference in relapse rate between two groups of patients (p>0.05, Fisher test). However, there was difference but not statistically significant in one-year progression free survival (p=0.05, chi square test) between groups, while there was statistically significant difference in two-year progression free survival favoring higher doses of radiotherapy (p<0.05, chi-square test). The median overall survival was 18 months (range, 12-35 months) for group I of patients and 28 months (range, 15-72 months) for group II of patients. There was no statistically significant advantage between two groups of patients for one-year overall survival (p>0.05, chi-square test). However, there was statistically significant difference in overall survival favoring higher radiotherapy doses for two-year overall survival (p<0.05, chi-square test). Conclusion: We found that higher radiotherapy doses had an impact on long-term time to progression, progression free survival, and overall survival (2 years) of patients.
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