Background/Aim. The aim of the study was investigating the significant difference in: a) the dosimetric calculation of the radiotherapy treatment planning system (TPS) in relation to the values obtained by measuring on the linear accelerator (Linac), b) the accuracy of the dosimetric calculation between the calculating algorithms Anisotropic Algorithm (AAA) and AcurosXB in various tissues and photon beam energies. Methods. For End-to-End test we used the heterogeneous phantom CIRS Thorax002LFC, which anatomically represents the human torso with set of inserts known relative electron density (RED) for obtaining a CT calibration curve, comparable to the “reference” CIRS 062M phantom. For the AAA and AcurosXB algorithms and for 6 MV and 16 MV photon beams in the TPS Varian Eclipse 13.6, four 3D conformal (3DCRT), and one intensity modulated (IMRT) and volumetric modulated arc (VMAT) radiotherapy plans were made. Measurements of the absolute dose in the Thorax phantom, by PTW-Semiflex ionization chamber, were carried out on three Varian-DHX Linacs. Results . The difference between "reference" and measured CT conversion curves in the bone area is 3 %. For 476 phantom measurements, the difference between measured and TPS calculated dose of (3-6) %, we had in 30 (6.3 %) cases. According to regression analysis, the standardized Beta coefficient for relative errors, 6 MV vs 16 MV, was 0.337 (33.7 %, p < 0.001). Mean relative errors for AAA vs AcurosXB, using Mann-Whitney test, for bones were 1.56 % and 2.64 % (p = 0.004). Conclusion. The End-to-End test on Thorax002LFC phantom proved the accuracy of TPS dose calculation in relation to the one delivered to the patient by Linac. There is a significant difference for photon energies relative errors (higher values are obtained for 16 MV vs 6 MV). A statistically significant minor relative error in AAA vs. AcurosXB was found for the bone. test, heterogeneous phantom, calculating algorithms.

This article presents the third part of data on selected new and noteworthy taxa ensuing from the revision of Herbarium collection of the Institute for Nature Conservation of the Vojvodina province (PZZP). Selected taxa include 11 species, three subspecies, three varieties, one infraspecific taxon with indetermined status [stat. indet.] and one nothospecies placed within seven genera (Filago L., Ludwigia L., Luzula DC., Lycopus L., Lythrum L., Phlomis L. and Silene L.). Two varieties (Luzula campestris subsp. campestris var. elata, Silene flos-cuculi subsp. floscuculi var. latifolia) and one infraspecific taxon with indetermined status (Luzula multiflora subsp. multiflora [stat. indet.] b. uliginosa) are new for a flora of Serbia. Additionally, one species (Ludwigia palustris) and one nothospecies (Lythrum ×scabrum) are confirmed for Serbia.

Continuous investment in education is a key factor in economic growth and development. Investing in education is an investment with a returns on investment and with multiple positive effects at the private and social levels. Earnings in the labor market represent private returns on investment in education and their measurement is in the center of the scientific literature. The main objective of this paper is to analyze modern theoretical and methodological approaches to measuring returns on investment in education, while analyzing the measurement methodology, indicators used and data sources. The scientific contribution of this paper is based on a concise and critical review of the scientific literature and trends in this field, with reference to the methodology used and indicators in measuring returns on investment in education.

Conflicts are an integral part of doing business and companies cannot avoid them. In a globalized and dynamic environment, there is a need to manage conflicts that occur within the company, in a productive and effective way. Conflict management styles are influenced by a number of factors, including the national culture of employees, who will have certain preferences in resolving conflicts in accordance with their culture. When it comes to multicultural environment, the knowledge of the national culture of the country in which the business is being done, as well as the company’s home country, national culture is extremely important for conflict management and creation of positive atmosphere in the company. Doing business in a foreign market additionally complicates the process of the creation of interpersonal conflicts. Thus, top management coming from the home country has a big task of understanding the values and customs which are the part of personality of each employee from another country, and at the same time, the understanding of the national culture of the country in which the business was internationalized. The aim of the research is to, based on theoretical and empirical research, examine the impact of Bosnian and Herzegovinian national culture on conflict resolution styles used in foreign companies doing business in Bosnia and Herzegovina. Research results show that the national culture is a significant factor in conflict management in a company, but also in conflicts in general. The level of harmonization of chosen styles and ways of managing them with the national culture of the employees will affect their business performance, positive atmosphere and communication, and more efficiency for achieving the company’s business goals.