Measuring competitiveness has become one of the key factors for ensuring successful and sustainable tourism development, especially destination's current level of development and its growth and vitality. The main goal of this study was to analyze the applicability of the Ritchie and Crouch competitiveness model in order to assess tourism advantages and disadvantages of Vojvodina Province (Northern Serbia) as a rural tourism destination. Exactly 216 tourism stakeholders on the supply side that have the knowledge and/or experience relevant to this topic were interviewed. The results show that stakeholders believe that Vojvodina is not a competitive rural tourism destination, but some destination's advantages were identified, and they can be used for improving Vojvodina's position on rural tourism market. The research has shown that the key resources and the attractions of rural areas of Vojvodina are rated better than the macro and industry-related factors. In order that Vojvodina stands out in the competitive market, destination marketing is crucial and should be more closely focused on new products and market development. .

Synchronisation block which is used as a part of photovoltaic (PV) inverters control structure has a key impact on connecting inverters with grid. One of the most important parameters in the point of connection PV inverter and grid is phase angle between grid voltage and inverter current. This angle determines the energy transfer between inverter and grid. Synchronisation alorithms have developed for very long time. At first, they were based on zero crossing grid voltage detection, while today complexed synchronisation algorithms implemented on high performance digital board have been used. One of these synchronisation structures  iz Phase Locked Loop – PLL. In this paper implementation of improved PLL structure is presented. This improved structure is special while it has posibillity of grid parameters estimation even if grid voltage has noise or DC offset. This DC offset from the grid in PLL structure usually entered via measurement and A/D conversion processor or may be generated due to temporary system faults. Appearance of DC offset in measured grid voltage on the one hand prevents any estimation process of grid parameters and on the other hand also degrades reference sine signal at the output of PLL structure in PV inverters. This improved structure is designed in digital form and implemented on FPGA digital board and experimental results of this implementation are presented. Obtained experimental results show that the proposed PLL structure successfully solves important issue such is presence of DC offset in measured grid voltage.

The aim of this study was to determine the composting kinetics for mixture of poultry manure and wheat straw based on the volatile solids content. Experimental data was fitted with the first-order and the nth-order kinetic model. The nth-order kinetic model showed better prediction performance than the firstorder kinetic model. For the first-order kinetic model, maximum and mean differences between experimental and simulation results for the content of volatile solids were 5.43% and 3.00%, for the first reactor, and 4.68% and 2.12% for the second reactor, respectively, for the nth-order kinetic model, maximum and mean differences were 4.92% and 1.68%, for the first reactor, and 4.09% and 1.42% for the second reactor, respectively.

The objectives of this study were to develop and validate the mathematical model (kinetic and reactor model) of composting process, as well to used validated model in order investigate the effects of the air flow rate on organic matter conversion, carbon dioxide concentration and mixture temperature. The mathematical model incorporated two microbial populations that metabolized composting material which was split into two different fractions according to its degradability (easily-degradable and hardly-degradable). Comparisons of simulation and experimental results for five dynamic state variables demonstrated that the model has very good predictions of the composting process. Simulations with validated model showed that among three dynamic state variables (organic matter conversion, carbon dioxide concentration, mixture temperature), carbon dioxide concentration is the most sensitive while organic matter conversion is the least sensitive to the change of air flow rate.

Background and Purpose: Dryocosmus kuriphilus is an invasive insect species of sweet chestnut (Castanea spp.) originating from China, and the only effective control measure against this pest is classical biological control with introduced parasitoid Torymus sinensis. This parasitoid has been widely released in many European countries, but it also has the ability to rapidly spread naturally. No official releases have been done in Bosnia and Herzegovina. Material and Methods: D. kuriphilus galls were collected in July 2017 on 6 localities in forest district Unsko (Una Sana canton) in Bosnia and Herzegovina. Presence and parasitism rates of T. sinensis were recorded in the entomological laboratory, Croatian Forest Research Institute. T. sinensis larvae were identified morphologically and by being compared with the voucher specimens. Results and Discussion: Torymus sinensis larvae were positively identified in the examined D. kuriphilus galls from all localities in Bosnia and Herzegovina. Parasitism rates ranged from 44.83 to 74%. Occurrence and high parasitism rates in Bosnia and Herzegovina observed in this study are not results of biocontrol releases of T. sinensis, but can be attributed to natural spread from Croatia. High parasitism rates observed in this study can indicate that the parasitoid was present in Bosnia and Herzegovina in 2016. Conclusions: This study presents the first record of Torymus sinensis in Bosnia and Herzegovina. We predict that the parasitoid will continue its spread over Bosnia and Herzegovina in sweet chestnut forests and orchards and that it will act as effective biological control agent against D. kuriphilus.

*1 The authors wish to express their gratitude to one of the postgraduate students (an employee of the specific Bank) for her valuable help with the empirical research. **2 Adisa Delić, PhD, Faculty of Economics, University of Tuzla, Univerzitetska 8, 75000 Tuzla, Bosnia and Herzegovina, Phone: +387 61 331 830, E-mail: adisa.delic@untz.ba ***3 Emira Kozarević, PhD, Faculty of Economics, University of Tuzla, Univerzitetska 8, 75000 Tuzla, Bosnia and Herzegovina, Phone: +387 61 178 821, E-mail: emira.kozarevic@untz.ba ****4 Mersiha Alić, PhD student, Indiana Institute of Technology (Indiana Tech), 1600 E. Washington Blvd. Fort Wayne, IN 46803, USA, Phone: Tel: +1 260 804 0415, E-mail: malic01@indianatech.net Abstract

Despite the economic importance of spider mites (Acari: Tetranychidae), data on their biodiversity are scarce in some regions of Europe, such as Balkan Peninsula and particularly in Serbia. In this country, according to the Spider Mites Web database, only 17 spider mite species belonging to seven genera have been reported. This study provides a review of the Serbian literature dealing with spider mites species recorded in Serbia and presents results of a four-year faunistic survey in which spider mites were collected on cultivated plants and native vegetation throughout the country. In the survey, a total of 23 species were recorded, including six species new to Serbian acarofauna: Bryobia praetiosa, Eotetranychus aceri, E. fraxini, E. pruni, Panonychus citri and Tetranychus evansi. Together with previously reported data, it raises the number of known spider mite species in Serbia to 36. A total of 90 host plant species from 21 families that are favorable to spider mites were recorded in this study; there were 62 new host records for 20 spider mite species with 11 records of new plant species as hosts of spider mites. There were 63 new records for Serbia among host plant species, raising the number of Serbian hosts for tetranychid mites to 137. The spider mite species new to Serbian acarofauna were found on 17 newly recorded host plants from 11 families. A key to all known spider mites species from Serbia is provided.

Alibabić V., Oraščanin M., Vahčić N. (2017): Geographical origin of honey from eight sub-regions of Bosnia and Herzegovina. Czech J. Food Sci., 35: 488–495. Principal component analysis (PCA) and cluster analysis (CA) were used to define the geographical origin of three types of monofloral (chestnut, linden, and acacia), two types of multifloral (meadow and mixed), and forest honey produced over two consecutive harvest seasons in the Una-Sana Canton (Bosnia and Herzegovina), which is geographically divided into eight sub-regions. Statistical analysis was applied to the measurement of physico-chemical and sensory parameters, as well as microand macronutrient (K, Na, Mg, Zn, Fe, Mn, and Al) content, along with some heavy metals (Cd, Pb, and As). Using the PCA method the characteristic parameters for all eight sub-regions were determined, while the CA grouping method was used to determine the characteristic parameters for six sub-regions. Chestnut honey is predominantly found in Cazin, chestnut and linden honey in Bosanska Krupa, chestnut and acacia honey in Bužim, acacia honey in Sanski Most, mixed honey in Velika Kladuša and forest honey in Ključ.

Summary Digital transformation as integration of digital technology into business results in fundamental changes of way world does business, communicate and develops on national and international level. There is increase of high-tech public spending which is connected with increase of need for high-tech as well as importance and benefits that it brings to development of economy. This so called digital or high-tech sector is one of the strategic sectors in the leading world economies, starting from the US and the European Union. EU recognized it in strategic document “Europe 2020” which sees this sector as key factor in smart growth based on tech knowledge and innovation. Europe, especially western and northern Europe, is trying to keep its competitiveness in global tech arena with USA and fast developing countries such as China and India as well as Asian tech giants such are Japan, South Korea and Singapore. There is increase of European countries investment in digital transformation through private and public ICT sector development which usually has positive impact on economic growth as well as key indicators such are GDP, productivity and employment. This paper provides basic review of digital transformation and high-tech sector in Europe as well as comparison between EU and Western Balkan countries. Additionally, there is analysis of influence of ICT spending on GDP growth. Paper could serve as basic for further research in area of influence of tech investment on key macroeconomics indicators.

Abstract One of the key goals of the economic policy makers of every country is to achieve internal and external balance. An unavoidable segment of the analysis concerning the achievement of internal and external balance is certainly the influence of the exchange rate regime applied in a country. European transition countries, despite their similar initial problems and final objectives, applied different exchange rate regimes adapted to the economic circumstances and needs of the country. The paper aims to examine and demonstrate the impact of the applied exchange rate regime on the internal balance of the transition countries. The research encompasses 10 representative transition countries, in the period from 2000-2014. The results of the research, from the aspect of internal balance, confirmed the justification of the application of the floating exchange rate regime in more developed, but not in less-developed, European transition countries. The application of floating exchange rate regimes in less-developed transition countries is associated with a considerably higher average inflation rate, which may be explained by the higher import dependence of lessdeveloped countries and by the consequent transfer of depreciation to price growth.

A total number of 24 local Turopolje pigs (TP) reared in outdoor area with predominantly forest vegetation were monitored for 20 weeks (from July to December 2015) with the aim to determine the prevalence of swine gastrointestinal parasites after exposure to natural infection. At the beginning of the trial, pigs were dewormed with 300 μg of doramectin per kg of body weight (Dectomax®, Pfizer ; 1 ml/33 kg). Faecal egg counts (FECs) were determined after 14 and 20 weeks in individually obtained samples separately for large roundworm (Ascaris suum) and other gastrointestinal parasites (Oesophagostomum spp., Strongyloides spp. and Hyostrongylus spp.). The results of coprological examination showed that main gastrointestinal parasites in outdoor reared TP are helminth species with strongyle-type eggs and coccidian Eimeria spp. In typical hot and dry season, more than 14 weeks’ period after antiparasitic treatment is required for infection and development of sexually mature parasite stages and eggs excretion in the faeces. These results may be important in designing of integrated gastrointestinal management practices for TP in traditional outdoor production systems, and generally useful for more sustainable management of this endangered breed in future.

Summary The surface exploitation of mineral raw materials inevitably changes the environment, thus resulting in soil degradation. This paper presents the results of growing sudangrass (Sorghum sudanense Pers.) in the reclaimed Deposol (technosols) in the Stanari Coal Mine area. Green manuring was the cultural practice used for sudangrass growing and land reclamation. The purpose of this research is to increase the amount of organic matter in the Deposol surface layer. The research was performed within a two-year period (2009-2010) at the experimental (technosol) site of the Stanari Coal Mine, located on the inside part of the overburden deposition site, near the Raskovac pit. The research of green manuring included a two-factor experiment with four replications. Two cultivars of sudangrass (Factor A) were used with three fertilization treatments (Factor B). The soil analyses indicated a sandy and low fertile soil. The experimental plot Deposol showed favorable physical properties, whereas its chemical and biological properties proved very unfavourable. The highest yield of biomass (29.15 t ha-1), as well as the dry matter (10.30 t ha-1), was recorded in the cultivar ‘Piper Sweet’ (in 2009), which was completely treated with mineral fertilizers. The lowest yields of biomass (2.05 t ha-1) and dry matter (0.95 t ha-1) were observed in the cultivar ‘Srem’ in 2010. Statistically significant differences were found between the treatments applied, emphasizing that only certain cultivars of sudangrass and types of fertilization (encompassing reasonably high amounts of nitrogen) can significantly increase the amount of organic matter in Deposol.

Introduction: A number of people with facial injuries after surgical treatment one knee time comes and a violation of the opposite knee. These injuries have a major impact on quality of life if they are not treated properly, but also have consequences and after surgery. The aim of this paper is to analyze the questionnaires used to assess the quality of life after mutual ruptured anterior cruciate ligament, and to make recommendations for optimal use of the same. Our goal is to establish a correlation between the results obtained from questionnaires used descriptive answers to questions descriptive questions about aspects of everyday life, aspects of physical activity as well as aspects of personal perception of the current health and satisfaction with it. Methods: We analyzed questionnaires used to evaluate the quality of life after a bilateral rupture of the anterior cruciate ligament, which are listed in the attached work. In accordance with the subject of research, in this paper were used the following scientific research methods: a method of deduction, analysis, classification, comparison, analysis methods of written documents. Results: By searching the PubMed database for the purpose of this master's thesis under the terms "unilateral rupture ACL" we came across a 2792 articles, while the term "bilateral rupture of the ACL," retrieved only 73 articles, "contralateral ACL rupture" 192 articles, "Quality of life ACL "  41 articles. The most important dates in our study are certainly "Quality of life after bilateral rupture of the anterior cruciate ligament," where we all find only two articles on this topic. Conclusion: The most commonly used questionnaires to be used in assessing the success of treatment and quality of life after a bilateral rupture of the anterior cruciate ligament are: QOL, IKDC, KOOS, HSS, ADL, SF-36, WOMAC. IKDC proved to be most suitable for patients with ACL rupture in this study.